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< ul class = "crumbs" > < li > < a href = "../index.html" > Home< / a > < / li > < li > < a href = "../compiler.html" > Inform7< / a > < / li > < li > < a href = "index.html" > assertions< / a > < / li > < li > < a href = "index.html#6" > Chapter 6: Rules, Rulebooks and Activities< / a > < / li > < li > < b > Booking Lists< / b > < / li > < / ul > < / div >
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< p class = "purpose" > Booking lists are linked lists of rule bookings. The content of a rulebook is a booking list.< / p >
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< ul class = "toc" > < li > < a href = "6-bl.html#SP1" > § 1. Introduction< / a > < / li > < li > < a href = "6-bl.html#SP4" > § 4. Creation< / a > < / li > < li > < a href = "6-bl.html#SP5" > § 5. Addition< / a > < / li > < li > < a href = "6-bl.html#SP6" > § 6. Removal< / a > < / li > < li > < a href = "6-bl.html#SP7" > § 7. Scanning lists for their contents< / a > < / li > < li > < a href = "6-bl.html#SP8" > § 8. Compilation of rule definitions for rulebook< / a > < / li > < / ul > < hr class = "tocbar" >
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< p class = "commentary firstcommentary" > < a id = "SP1" class = "paragraph-anchor" > < / a > < b > § 1. Introduction. < / b > Bookings are intended to be bound together in linked lists, each of which
represents the interior pages of a single rulebook.
< / p >
< pre class = "displayed-code all-displayed-code code-font" >
< span class = "reserved-syntax" > typedef< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > struct< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > booking_list< / span > < span class = "plain-syntax" > {< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > struct< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > booking< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > list_head< / span > < span class = "plain-syntax" > ; < / span > < span class = "comment-syntax" > the dummy entry at the front< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > CLASS_DEFINITION< / span >
< span class = "plain-syntax" > } < / span > < span class = "reserved-syntax" > booking_list< / span > < span class = "plain-syntax" > ;< / span >
< / pre >
< ul class = "endnotetexts" > < li > The structure booking_list is private to this section.< / li > < / ul >
< p class = "commentary firstcommentary" > < a id = "SP2" class = "paragraph-anchor" > < / a > < b > § 2. < / b > There are only three operations on lists: creation, addition of a booking,
and removal of a booking. The following invariants are preserved:
< / p >
< ul class = "items" > < li > (a) The list head is a dummy, i.e., meaningless, booking which has never been
the subject of any addition operation and has never moved.
< / li > < li > (b) The only < span class = "extract" > < span class = "extract-syntax" > FIRST_PLACEMENT< / span > < / span > entries in the list immediately follow the list
head. Those which were added explicitly as first-placed are in reverse order
of addition to the list.
< / li > < li > (c) The only < span class = "extract" > < span class = "extract-syntax" > LAST_PLACEMENT< / span > < / span > entries in the list are at the end. Those which
were added explicitly as last-placed are in order of addition to the list.
< / li > < li > (d) If R and S are middle-placed rules which were placed in the list within
the same range (say, both anywhere, or both "after T" or "before U") and R
precedes S, then either R is more specific than S, or they are equally specific
and R was added to the list before S.
< / li > < li > (e) The list never contains duplicates, that is, never contains two bookings
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whose rules are equal, in the sense of < a href = "6-rls.html#SP13" class = "internal" > Rules::eq< / a > .
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< / li > < / ul >
< p class = "commentary firstcommentary" > < a id = "SP3" class = "paragraph-anchor" > < / a > < b > § 3. < / b > These macros are useful for iterating through the contents in sequence;
note that < span class = "extract" > < span class = "extract-syntax" > br< / span > < / span > is never equal to the dummy head, and that < span class = "extract" > < span class = "extract-syntax" > pr< / span > < / span > is never < span class = "extract" > < span class = "extract-syntax" > NULL< / span > < / span > —
though it is initially equal to the dummy, which of course is the point of
having the dummy.
< / p >
< pre class = "definitions code-font" > < span class = "definition-keyword" > define< / span > < span class = "identifier-syntax" > LOOP_OVER_BOOKINGS< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > br< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > L< / span > < span class = "plain-syntax" > )< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > for< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > booking< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > br< / span > < span class = "plain-syntax" > =(< / span > < span class = "identifier-syntax" > L< / span > < span class = "plain-syntax" > )?(< / span > < span class = "identifier-syntax" > L< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > list_head< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > next_booking< / span > < span class = "plain-syntax" > ):< / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ; < / span > < span class = "identifier-syntax" > br< / span > < span class = "plain-syntax" > ; < / span > < span class = "identifier-syntax" > br< / span > < span class = "plain-syntax" > =< / span > < span class = "identifier-syntax" > br< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > next_booking< / span > < span class = "plain-syntax" > )< / span >
< span class = "definition-keyword" > define< / span > < span class = "identifier-syntax" > LOOP_OVER_BOOKINGS_WITH_PREV< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > br< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > pr< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > L< / span > < span class = "plain-syntax" > )< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > for< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > booking< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > br< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > L< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > list_head< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > next_booking< / span > < span class = "plain-syntax" > , *< / span > < span class = "identifier-syntax" > pr< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > L< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > list_head< / span > < span class = "plain-syntax" > ; < / span > < span class = "identifier-syntax" > br< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > pr< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > br< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > br< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > br< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > next_booking< / span > < span class = "plain-syntax" > )< / span >
< / pre >
< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > BookingLists::log< / span > < button class = "popup" onclick = "togglePopup('usagePopup1')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup1" > Usage of < span class = "code-font" > < span class = "function-syntax" > BookingLists::log< / span > < / span > :< br / > Rule Bookings - < a href = "6-rb.html#SP8_1" > § 8.1< / a > < br / > Rulebooks - < a href = "6-rlb.html#SP9" > § 9< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > booking_list< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > L< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > L< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ) { < / span > < span class = "identifier-syntax" > LOG< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "< null-booked-rule-list> \n"< / span > < span class = "plain-syntax" > ); < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > ; }< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > t< / span > < span class = "plain-syntax" > = < / span > < a href = "6-bl.html#SP7" class = "function-link" > < span class = "function-syntax" > BookingLists::length< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > L< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > t< / span > < span class = "plain-syntax" > == < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > ) { < / span > < span class = "identifier-syntax" > LOG< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "< empty-booked-rule-list> \n"< / span > < span class = "plain-syntax" > ); < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > ; }< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > s< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > 1< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > LOOP_OVER_BOOKINGS< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > br< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > L< / span > < span class = "plain-syntax" > )< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > LOG< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > " %d/%d. $b\n"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > s< / span > < span class = "plain-syntax" > ++, < / span > < span class = "identifier-syntax" > t< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > br< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > }< / span >
< / pre >
< p class = "commentary firstcommentary" > < a id = "SP4" class = "paragraph-anchor" > < / a > < b > § 4. Creation. < / b > A new list is a dummy header (see (a) above):
< / p >
< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "reserved-syntax" > booking_list< / span > < span class = "plain-syntax" > *< / span > < span class = "function-syntax" > BookingLists::new< / span > < button class = "popup" onclick = "togglePopup('usagePopup2')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup2" > Usage of < span class = "code-font" > < span class = "function-syntax" > BookingLists::new< / span > < / span > :< br / > Rulebooks - < a href = "6-rlb.html#SP2" > § 2< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > booking_list< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > L< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > CREATE< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > booking_list< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > L< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > list_head< / span > < span class = "plain-syntax" > = < / span > < a href = "6-rb.html#SP3" class = "function-link" > < span class = "function-syntax" > RuleBookings::new< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > L< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
< / pre >
< p class = "commentary firstcommentary" > < a id = "SP5" class = "paragraph-anchor" > < / a > < b > § 5. Addition. < / b > The following is called when a booking < span class = "extract" > < span class = "extract-syntax" > br< / span > < / span > for the rule R needs to be placed
into list < span class = "extract" > < span class = "extract-syntax" > L< / span > < / span > , which is the contents of a rulebook we will call B. This happens,
for example, in response to an an assertion like "R is listed after S in B";
in that cast the < span class = "extract" > < span class = "extract-syntax" > side< / span > < / span > would be < span class = "extract" > < span class = "extract-syntax" > AFTER_SIDE< / span > < / span > , and the < span class = "extract" > < span class = "extract-syntax" > ref_rule< / span > < / span > would be S.
< / p >
< p class = "commentary" > It is also possible to specify a < span class = "extract" > < span class = "extract-syntax" > placing< / span > < / span > . For example, for a rule described
as "First every turn rule: ...", this would be added to the every turn rulebook
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with placing < span class = "extract" > < span class = "extract-syntax" > FIRST_PLACEMENT< / span > < / span > . There are three possible placings: see < a href = "6-rb.html#SP1" class = "internal" > booking< / a >
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for what they are.
< / p >
< p class = "commentary" > And since there are four possible sides, the following function effectively has
12 different modes to get right.
< / p >
< p class = "commentary" > Each "addition" leaves the list either the same size or longer by 1.
< / p >
< pre class = "definitions code-font" > < span class = "definition-keyword" > define< / span > < span class = "constant-syntax" > BEFORE_SIDE< / span > < span class = "plain-syntax" > -1 < / span > < span class = "comment-syntax" > before the reference rule< / span >
< span class = "definition-keyword" > define< / span > < span class = "constant-syntax" > IN_SIDE< / span > < span class = "plain-syntax" > < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > < / span > < span class = "comment-syntax" > if no mention is made of where to put the new booking< / span >
< span class = "definition-keyword" > define< / span > < span class = "constant-syntax" > AFTER_SIDE< / span > < span class = "plain-syntax" > < / span > < span class = "constant-syntax" > 1< / span > < span class = "plain-syntax" > < / span > < span class = "comment-syntax" > after the reference rule< / span >
< span class = "definition-keyword" > define< / span > < span class = "constant-syntax" > INSTEAD_SIDE< / span > < span class = "plain-syntax" > < / span > < span class = "constant-syntax" > 2< / span > < span class = "plain-syntax" > < / span > < span class = "comment-syntax" > in place of the reference rule< / span >
< / pre >
< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > BookingLists::add< / span > < button class = "popup" onclick = "togglePopup('usagePopup3')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup3" > Usage of < span class = "code-font" > < span class = "function-syntax" > BookingLists::add< / span > < / span > :< br / > Rulebooks - < a href = "6-rlb.html#SP12" > § 12< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > booking_list< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > L< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > booking< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > new_br< / span > < span class = "plain-syntax" > ,< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > placing< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > side< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > rule< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > ref_rule< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "named-paragraph-container code-font" > < a href = "6-bl.html#SP5_1" class = "named-paragraph-link" > < span class = "named-paragraph" > Make some sanity checks on the addition instructions< / span > < span class = "named-paragraph-number" > 5.1< / span > < / a > < / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "named-paragraph-container code-font" > < a href = "6-bl.html#SP5_2" class = "named-paragraph-link" > < span class = "named-paragraph" > Handle the case where the new rule is already in the list< / span > < span class = "named-paragraph-number" > 5.2< / span > < / a > < / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "named-paragraph-container code-font" > < a href = "6-bl.html#SP5_3" class = "named-paragraph-link" > < span class = "named-paragraph" > Handle all placements made with the INSTEAD side< / span > < span class = "named-paragraph-number" > 5.3< / span > < / a > < / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "named-paragraph-container code-font" > < a href = "6-bl.html#SP5_4" class = "named-paragraph-link" > < span class = "named-paragraph" > Handle all placements made with the FIRST placement< / span > < span class = "named-paragraph-number" > 5.4< / span > < / a > < / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "named-paragraph-container code-font" > < a href = "6-bl.html#SP5_5" class = "named-paragraph-link" > < span class = "named-paragraph" > Handle all placements made with the LAST placement< / span > < span class = "named-paragraph-number" > 5.5< / span > < / a > < / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "named-paragraph-container code-font" > < a href = "6-bl.html#SP5_6" class = "named-paragraph-link" > < span class = "named-paragraph" > Handle what's left: MIDDLE placements on the IN, BEFORE or AFTER sides< / span > < span class = "named-paragraph-number" > 5.6< / span > < / a > < / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > }< / span >
< / pre >
< p class = "commentary firstcommentary" > < a id = "SP5_1" class = "paragraph-anchor" > < / a > < b > § 5.1. < / b > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Make some sanity checks on the addition instructions< / span > < span class = "named-paragraph-number" > 5.1< / span > < / span > < span class = "comment-syntax" > =< / span >
< / p >
< pre class = "displayed-code all-displayed-code code-font" >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > ((< / span > < span class = "identifier-syntax" > side< / span > < span class = "plain-syntax" > != < / span > < span class = "constant-syntax" > IN_SIDE< / span > < span class = "plain-syntax" > ) & & (< / span > < span class = "identifier-syntax" > ref_rule< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ))< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "tried to add before or after or instead of non-rule"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > ((< / span > < span class = "identifier-syntax" > side< / span > < span class = "plain-syntax" > == < / span > < span class = "constant-syntax" > IN_SIDE< / span > < span class = "plain-syntax" > ) & & (< / span > < span class = "identifier-syntax" > ref_rule< / span > < span class = "plain-syntax" > != < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ))< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "tried to add in middle but with ref rule"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > ((< / span > < span class = "identifier-syntax" > side< / span > < span class = "plain-syntax" > != < / span > < span class = "constant-syntax" > IN_SIDE< / span > < span class = "plain-syntax" > ) & & (< / span > < span class = "identifier-syntax" > placing< / span > < span class = "plain-syntax" > != < / span > < span class = "constant-syntax" > MIDDLE_PLACEMENT< / span > < span class = "plain-syntax" > ))< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "tried to add before or after but with non-middle placement"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > L< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > )< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "tried to add rule to null list"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > switch< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > placing< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > case< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > MIDDLE_PLACEMENT:< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > break< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > case< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > FIRST_PLACEMENT:< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > LOGIF< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > RULE_ATTACHMENTS< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > "Placed first\n"< / span > < span class = "plain-syntax" > ); < / span > < span class = "reserved-syntax" > break< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > case< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > LAST_PLACEMENT:< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > LOGIF< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > RULE_ATTACHMENTS< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > "Placed last\n"< / span > < span class = "plain-syntax" > ); < / span > < span class = "reserved-syntax" > break< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > default:< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "invalid placing of rule"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > }< / span >
< / pre >
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< ul class = "endnotetexts" > < li > This code is used in < a href = "6-bl.html#SP5" > § 5< / a > .< / li > < / ul >
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< p class = "commentary firstcommentary" > < a id = "SP5_2" class = "paragraph-anchor" > < / a > < b > § 5.2. < / b > If R is already in B, the assertion may still have an effect.
< / p >
< p class = "commentary" > If our instructions specify no particular position for R to take, we return
because nothing need be done: the rule's there already, so be happy. Otherwise,
we remove R's existing booking in order that it can be rebooked in a new position.
< / p >
< p class = "commentary" > This is a change in semantics from the original Inform 7 design for rulebooks,
under which a rule could be booked multiple times in the same rulebook — which
was then called "duplication". Following debate on the Usenet newsgroup
< span class = "extract" > < span class = "extract-syntax" > rec.arts.int-fiction< / span > < / span > in February and March 2009, it was decided to abolish
duplication in favour of the clean principle that a rule can only be in a
single rulebook once. This makes it easier to place rules with tricky preambles,
though there were arguments on both sides.
< / p >
< p class = "commentary" > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Handle the case where the new rule is already in the list< / span > < span class = "named-paragraph-number" > 5.2< / span > < / span > < span class = "comment-syntax" > =< / span >
< / p >
< pre class = "displayed-code all-displayed-code code-font" >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > LOOP_OVER_BOOKINGS_WITH_PREV< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > pos< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > prev< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > L< / span > < span class = "plain-syntax" > )< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < a href = "6-rls.html#SP13" class = "function-link" > < span class = "function-syntax" > Rules::eq< / span > < / a > < span class = "plain-syntax" > (< / span > < a href = "6-rb.html#SP4" class = "function-link" > < span class = "function-syntax" > RuleBookings::get_rule< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > pos< / span > < span class = "plain-syntax" > ), < / span > < a href = "6-rb.html#SP4" class = "function-link" > < span class = "function-syntax" > RuleBookings::get_rule< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > new_br< / span > < span class = "plain-syntax" > ))) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > ((< / span > < span class = "identifier-syntax" > side< / span > < span class = "plain-syntax" > == < / span > < span class = "constant-syntax" > IN_SIDE< / span > < span class = "plain-syntax" > ) & & (< / span > < span class = "identifier-syntax" > placing< / span > < span class = "plain-syntax" > == < / span > < span class = "constant-syntax" > MIDDLE_PLACEMENT< / span > < span class = "plain-syntax" > )) < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > prev< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > next_booking< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > pos< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > next_booking< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > pos< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > next_booking< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > LOGIF< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > RULE_ATTACHMENTS< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > "Removing previous entry from rulebook\n"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > break< / span > < span class = "plain-syntax" > ; < / span > < span class = "comment-syntax" > rule can only appear once, so no need to keep checking< / span >
< span class = "plain-syntax" > }< / span >
< / pre >
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< ul class = "endnotetexts" > < li > This code is used in < a href = "6-bl.html#SP5" > § 5< / a > .< / li > < / ul >
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< p class = "commentary firstcommentary" > < a id = "SP5_3" class = "paragraph-anchor" > < / a > < b > § 5.3. < / b > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Handle all placements made with the INSTEAD side< / span > < span class = "named-paragraph-number" > 5.3< / span > < / span > < span class = "comment-syntax" > =< / span >
< / p >
< pre class = "displayed-code all-displayed-code code-font" >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > side< / span > < span class = "plain-syntax" > == < / span > < span class = "constant-syntax" > INSTEAD_SIDE< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > LOOP_OVER_BOOKINGS_WITH_PREV< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > pos< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > prev< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > L< / span > < span class = "plain-syntax" > )< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < a href = "6-rls.html#SP13" class = "function-link" > < span class = "function-syntax" > Rules::eq< / span > < / a > < span class = "plain-syntax" > (< / span > < a href = "6-rb.html#SP4" class = "function-link" > < span class = "function-syntax" > RuleBookings::get_rule< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > pos< / span > < span class = "plain-syntax" > ), < / span > < span class = "identifier-syntax" > ref_rule< / span > < span class = "plain-syntax" > )) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > new_br< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > placement< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > pos< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > placement< / span > < span class = "plain-syntax" > ; < / span > < span class = "comment-syntax" > replace with same placement< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > new_br< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > next_booking< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > pos< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > next_booking< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > prev< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > next_booking< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > new_br< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
< / pre >
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< ul class = "endnotetexts" > < li > This code is used in < a href = "6-bl.html#SP5" > § 5< / a > .< / li > < / ul >
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< p class = "commentary firstcommentary" > < a id = "SP5_4" class = "paragraph-anchor" > < / a > < b > § 5.4. < / b > If we insert a rule as first-placed rule when there already is a first-placed
rule, the new one displaces it to go first, but both continue to be labelled as
having < span class = "extract" > < span class = "extract-syntax" > FIRST_PLACEMENT< / span > < / span > , so that subsequent rule insertions of middle-placed rules
will still go after both of them.
< / p >
< p class = "commentary" > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Handle all placements made with the FIRST placement< / span > < span class = "named-paragraph-number" > 5.4< / span > < / span > < span class = "comment-syntax" > =< / span >
< / p >
< pre class = "displayed-code all-displayed-code code-font" >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > placing< / span > < span class = "plain-syntax" > == < / span > < span class = "constant-syntax" > FIRST_PLACEMENT< / span > < span class = "plain-syntax" > ) { < / span > < span class = "comment-syntax" > first in valid interval (must be whole list)< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > booking< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > previously_first< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > L< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > list_head< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > next_booking< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > L< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > list_head< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > next_booking< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > new_br< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > new_br< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > next_booking< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > previously_first< / span > < span class = "plain-syntax" > ; < / span > < span class = "comment-syntax" > pushes any existing first rule forward< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > new_br< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > placement< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > placing< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
< / pre >
2021-03-30 00:53:01 +03:00
< ul class = "endnotetexts" > < li > This code is used in < a href = "6-bl.html#SP5" > § 5< / a > .< / li > < / ul >
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< p class = "commentary firstcommentary" > < a id = "SP5_5" class = "paragraph-anchor" > < / a > < b > § 5.5. < / b > Symmetrically, a second last-placed rule is inserted after any existing one, but
both are labelled as having < span class = "extract" > < span class = "extract-syntax" > LAST_PLACEMENT< / span > < / span > .
< / p >
< p class = "commentary" > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Handle all placements made with the LAST placement< / span > < span class = "named-paragraph-number" > 5.5< / span > < / span > < span class = "comment-syntax" > =< / span >
< / p >
< pre class = "displayed-code all-displayed-code code-font" >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > placing< / span > < span class = "plain-syntax" > == < / span > < span class = "constant-syntax" > LAST_PLACEMENT< / span > < span class = "plain-syntax" > ) { < / span > < span class = "comment-syntax" > last in valid interval (must be whole list)< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > booking< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > prev< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > L< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > list_head< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > while< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > prev< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > next_booking< / span > < span class = "plain-syntax" > != < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > prev< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > prev< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > next_booking< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > prev< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > next_booking< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > new_br< / span > < span class = "plain-syntax" > ; < / span > < span class = "comment-syntax" > pushes any existing last rule backward< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > new_br< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > next_booking< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > new_br< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > placement< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > placing< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
< / pre >
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< ul class = "endnotetexts" > < li > This code is used in < a href = "6-bl.html#SP5" > § 5< / a > .< / li > < / ul >
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< p class = "commentary firstcommentary" > < a id = "SP5_6" class = "paragraph-anchor" > < / a > < b > § 5.6. < / b > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Handle what's left: MIDDLE placements on the IN, BEFORE or AFTER sides< / span > < span class = "named-paragraph-number" > 5.6< / span > < / span > < span class = "comment-syntax" > =< / span >
< / p >
< pre class = "displayed-code all-displayed-code code-font" >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > booking< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > start_rule< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > L< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > list_head< / span > < span class = "plain-syntax" > ; < / span > < span class = "comment-syntax" > valid interval begins after this rule< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > booking< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > end_rule< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ; < / span > < span class = "comment-syntax" > valid interval ends before this rule, or runs to end if < / span > < span class = "extract" > < span class = "extract-syntax" > NULL< / span > < / span >
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< span class = "plain-syntax" > < / span > < span class = "named-paragraph-container code-font" > < a href = "6-bl.html#SP5_6_1" class = "named-paragraph-link" > < span class = "named-paragraph" > Adjust the valid interval to take care of BEFORE and AFTER side requirements< / span > < span class = "named-paragraph-number" > 5.6.1< / span > < / a > < / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "named-paragraph-container code-font" > < a href = "6-bl.html#SP5_6_2" class = "named-paragraph-link" > < span class = "named-paragraph" > Check that the valid interval is indeed as advertised< / span > < span class = "named-paragraph-number" > 5.6.2< / span > < / a > < / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > booking< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > insert_after< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > start_rule< / span > < span class = "plain-syntax" > ; < / span > < span class = "comment-syntax" > insertion point is after this< / span >
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< span class = "plain-syntax" > < / span > < span class = "named-paragraph-container code-font" > < a href = "6-bl.html#SP5_6_3" class = "named-paragraph-link" > < span class = "named-paragraph" > Find insertion point, keeping the valid interval in specificity order< / span > < span class = "named-paragraph-number" > 5.6.3< / span > < / a > < / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > booking< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > subseq< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > insert_after< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > next_booking< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > insert_after< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > next_booking< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > new_br< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > new_br< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > next_booking< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > subseq< / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > < / span > < span class = "named-paragraph-container code-font" > < a href = "6-bl.html#SP5_6_4" class = "named-paragraph-link" > < span class = "named-paragraph" > Set the placement for the new rule booking< / span > < span class = "named-paragraph-number" > 5.6.4< / span > < / a > < / span > < span class = "plain-syntax" > ;< / span >
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< / pre >
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< ul class = "endnotetexts" > < li > This code is used in < a href = "6-bl.html#SP5" > § 5< / a > .< / li > < / ul >
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< p class = "commentary firstcommentary" > < a id = "SP5_6_1" class = "paragraph-anchor" > < / a > < b > § 5.6.1. < / b > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Adjust the valid interval to take care of BEFORE and AFTER side requirements< / span > < span class = "named-paragraph-number" > 5.6.1< / span > < / span > < span class = "comment-syntax" > =< / span >
< / p >
< pre class = "displayed-code all-displayed-code code-font" >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > switch< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > side< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > case< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > BEFORE_SIDE:< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > LOOP_OVER_BOOKINGS< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > pos< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > L< / span > < span class = "plain-syntax" > )< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < a href = "6-rls.html#SP13" class = "function-link" > < span class = "function-syntax" > Rules::eq< / span > < / a > < span class = "plain-syntax" > (< / span > < a href = "6-rb.html#SP4" class = "function-link" > < span class = "function-syntax" > RuleBookings::get_rule< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > pos< / span > < span class = "plain-syntax" > ), < / span > < span class = "identifier-syntax" > ref_rule< / span > < span class = "plain-syntax" > ))< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > end_rule< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > pos< / span > < span class = "plain-syntax" > ; < / span > < span class = "comment-syntax" > insert before: so valid interval ends here< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > end_rule< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "can't find end rule"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > break< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > case< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > AFTER_SIDE:< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > LOOP_OVER_BOOKINGS< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > pos< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > L< / span > < span class = "plain-syntax" > )< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < a href = "6-rls.html#SP13" class = "function-link" > < span class = "function-syntax" > Rules::eq< / span > < / a > < span class = "plain-syntax" > (< / span > < a href = "6-rb.html#SP4" class = "function-link" > < span class = "function-syntax" > RuleBookings::get_rule< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > pos< / span > < span class = "plain-syntax" > ), < / span > < span class = "identifier-syntax" > ref_rule< / span > < span class = "plain-syntax" > ))< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > start_rule< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > pos< / span > < span class = "plain-syntax" > ; < / span > < span class = "comment-syntax" > insert after: so valid interval begins here< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > start_rule< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > L< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > list_head< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "can't find start rule"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > break< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
< / pre >
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< ul class = "endnotetexts" > < li > This code is used in < a href = "6-bl.html#SP5_6" > § 5.6< / a > .< / li > < / ul >
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< p class = "commentary firstcommentary" > < a id = "SP5_6_2" class = "paragraph-anchor" > < / a > < b > § 5.6.2. < / b > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Check that the valid interval is indeed as advertised< / span > < span class = "named-paragraph-number" > 5.6.2< / span > < / span > < span class = "comment-syntax" > =< / span >
< / p >
< pre class = "displayed-code all-displayed-code code-font" >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > t< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > 2< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > end_rule< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > t< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > 1< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > booking< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > pos< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > for< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > pos< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > L< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > list_head< / span > < span class = "plain-syntax" > ; < / span > < span class = "identifier-syntax" > pos< / span > < span class = "plain-syntax" > ; < / span > < span class = "identifier-syntax" > pos< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > pos< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > next_booking< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > ((< / span > < span class = "identifier-syntax" > pos< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > start_rule< / span > < span class = "plain-syntax" > ) & & (< / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > == < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > )) < / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > 1< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > ((< / span > < span class = "identifier-syntax" > pos< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > end_rule< / span > < span class = "plain-syntax" > ) & & (< / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > == < / span > < span class = "constant-syntax" > 1< / span > < span class = "plain-syntax" > )) < / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > 2< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > != < / span > < span class = "identifier-syntax" > t< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "valid rule interval isn't"< / span > < span class = "plain-syntax" > );< / span >
< / pre >
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< ul class = "endnotetexts" > < li > This code is used in < a href = "6-bl.html#SP5_6" > § 5.6< / a > .< / li > < / ul >
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< p class = "commentary firstcommentary" > < a id = "SP5_6_3" class = "paragraph-anchor" > < / a > < b > § 5.6.3. < / b > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Find insertion point, keeping the valid interval in specificity order< / span > < span class = "named-paragraph-number" > 5.6.3< / span > < / span > < span class = "comment-syntax" > =< / span >
< / p >
< pre class = "displayed-code all-displayed-code code-font" >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > log< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > FALSE< / span > < span class = "plain-syntax" > ; < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Log::aspect_switched_on< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > SPECIFICITIES_DA< / span > < span class = "plain-syntax" > )) < / span > < span class = "identifier-syntax" > log< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > TRUE< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "comment-syntax" > move forward to final valid first rule (if any exist)< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > while< / span > < span class = "plain-syntax" > ((< / span > < span class = "identifier-syntax" > insert_after< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > next_booking< / span > < span class = "plain-syntax" > != < / span > < span class = "identifier-syntax" > end_rule< / span > < span class = "plain-syntax" > )< / span >
< span class = "plain-syntax" > & & (< / span > < span class = "identifier-syntax" > insert_after< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > next_booking< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > placement< / span > < span class = "plain-syntax" > == < / span > < span class = "constant-syntax" > FIRST_PLACEMENT< / span > < span class = "plain-syntax" > ))< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > insert_after< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > insert_after< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > next_booking< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "comment-syntax" > move forward past other middle rules if they are not less specific< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > while< / span > < span class = "plain-syntax" > ((< / span > < span class = "identifier-syntax" > insert_after< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > next_booking< / span > < span class = "plain-syntax" > != < / span > < span class = "identifier-syntax" > end_rule< / span > < span class = "plain-syntax" > ) < / span > < span class = "comment-syntax" > stop before < / span > \(p\)< span class = "comment-syntax" > leaves valid range< / span >
< span class = "plain-syntax" > & & (< / span > < span class = "identifier-syntax" > insert_after< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > next_booking< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > placement< / span > < span class = "plain-syntax" > != < / span > < span class = "constant-syntax" > LAST_PLACEMENT< / span > < span class = "plain-syntax" > ) < / span > < span class = "comment-syntax" > or reaches a last rule< / span >
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< span class = "plain-syntax" > & & (< / span > < a href = "6-rb.html#SP7" class = "function-link" > < span class = "function-syntax" > RuleBookings::cmp< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > insert_after< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > next_booking< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > new_br< / span > < span class = "plain-syntax" > ,< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > log< / span > < span class = "plain-syntax" > ) > = < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > )) < / span > < span class = "comment-syntax" > or a rule less specific than the new one< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > insert_after< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > insert_after< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > next_booking< / span > < span class = "plain-syntax" > ;< / span >
< / pre >
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< ul class = "endnotetexts" > < li > This code is used in < a href = "6-bl.html#SP5_6" > § 5.6< / a > .< / li > < / ul >
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< p class = "commentary firstcommentary" > < a id = "SP5_6_4" class = "paragraph-anchor" > < / a > < b > § 5.6.4. < / b > Since this part of the algorithm is used only when we've requested MIDDLE
placement, it might seem that < span class = "extract" > < span class = "extract-syntax" > new_br-> placement< / span > < / span > should always be set to
that. This does indeed mostly happen, but not always. To preserve rulebook
invariants (b) and (c), we need to force anything added after a LAST rule
to be LAST as well, and similarly for FIRSTs. (This will only happen in
cases where the source text called for placements AFTER a LAST rule, or
BEFORE a FIRST one.)
< / p >
< p class = "commentary" > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Set the placement for the new rule booking< / span > < span class = "named-paragraph-number" > 5.6.4< / span > < / span > < span class = "comment-syntax" > =< / span >
< / p >
< pre class = "displayed-code all-displayed-code code-font" >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > new_br< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > placement< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > MIDDLE_PLACEMENT< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > ((< / span > < span class = "identifier-syntax" > insert_after< / span > < span class = "plain-syntax" > != < / span > < span class = "identifier-syntax" > L< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > list_head< / span > < span class = "plain-syntax" > ) & & < / span >
< span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > insert_after< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > placement< / span > < span class = "plain-syntax" > == < / span > < span class = "constant-syntax" > LAST_PLACEMENT< / span > < span class = "plain-syntax" > ))< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > new_br< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > placement< / span > < span class = "plain-syntax" > =< / span >
< span class = "plain-syntax" > < / span > < span class = "constant-syntax" > LAST_PLACEMENT< / span > < span class = "plain-syntax" > ; < / span > < span class = "comment-syntax" > happens if valid interval is after a last rule< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > ((< / span > < span class = "identifier-syntax" > subseq< / span > < span class = "plain-syntax" > ) & & < / span >
< span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > subseq< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > placement< / span > < span class = "plain-syntax" > == < / span > < span class = "constant-syntax" > FIRST_PLACEMENT< / span > < span class = "plain-syntax" > ))< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > new_br< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > placement< / span > < span class = "plain-syntax" > =< / span >
< span class = "plain-syntax" > < / span > < span class = "constant-syntax" > FIRST_PLACEMENT< / span > < span class = "plain-syntax" > ; < / span > < span class = "comment-syntax" > happens if valid interval is before a first rule< / span >
< / pre >
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< ul class = "endnotetexts" > < li > This code is used in < a href = "6-bl.html#SP5_6" > § 5.6< / a > .< / li > < / ul >
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< p class = "commentary firstcommentary" > < a id = "SP6" class = "paragraph-anchor" > < / a > < b > § 6. Removal. < / b > This is much simpler, since it doesn't disturb the ordering:
< / p >
< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > BookingLists::remove< / span > < button class = "popup" onclick = "togglePopup('usagePopup4')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup4" > Usage of < span class = "code-font" > < span class = "function-syntax" > BookingLists::remove< / span > < / span > :< br / > Rulebooks - < a href = "6-rlb.html#SP13" > § 13< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > booking_list< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > L< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > rule< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > R< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > LOOP_OVER_BOOKINGS_WITH_PREV< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > br< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > pr< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > L< / span > < span class = "plain-syntax" > )< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < a href = "6-rls.html#SP13" class = "function-link" > < span class = "function-syntax" > Rules::eq< / span > < / a > < span class = "plain-syntax" > (< / span > < a href = "6-rb.html#SP4" class = "function-link" > < span class = "function-syntax" > RuleBookings::get_rule< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > br< / span > < span class = "plain-syntax" > ), < / span > < span class = "identifier-syntax" > R< / span > < span class = "plain-syntax" > )) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > pr< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > next_booking< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > br< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > next_booking< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > }< / span >
< / pre >
< p class = "commentary firstcommentary" > < a id = "SP7" class = "paragraph-anchor" > < / a > < b > § 7. Scanning lists for their contents. < / b > < / p >
< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > BookingLists::length< / span > < button class = "popup" onclick = "togglePopup('usagePopup5')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup5" > Usage of < span class = "code-font" > < span class = "function-syntax" > BookingLists::length< / span > < / span > :< br / > < a href = "6-bl.html#SP3" > § 3< / a > , < a href = "6-bl.html#SP8" > § 8< / a > < br / > Rulebooks - < a href = "6-rlb.html#SP7" > § 7< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > booking_list< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > L< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > n< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > LOOP_OVER_BOOKINGS< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > br< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > L< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > n< / span > < span class = "plain-syntax" > ++;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > n< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
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< span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > BookingLists::is_contextually_empty< / span > < button class = "popup" onclick = "togglePopup('usagePopup6')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup6" > Usage of < span class = "code-font" > < span class = "function-syntax" > BookingLists::is_contextually_empty< / span > < / span > :< br / > Rulebooks - < a href = "6-rlb.html#SP7" > § 7< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > booking_list< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > L< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > rule_context< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > rc< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > LOOP_OVER_BOOKINGS< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > br< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > L< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > imperative_defn< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > id< / span > < span class = "plain-syntax" > = < / span > < a href = "6-rls.html#SP9" class = "function-link" > < span class = "function-syntax" > Rules::get_imperative_definition< / span > < / a > < span class = "plain-syntax" > (< / span > < a href = "6-rb.html#SP4" class = "function-link" > < span class = "function-syntax" > RuleBookings::get_rule< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > br< / span > < span class = "plain-syntax" > ));< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > ((< / span > < span class = "identifier-syntax" > id< / span > < span class = "plain-syntax" > ) & & (< / span > < span class = "identifier-syntax" > IXRules::phrase_fits_rule_context< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > id< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > body_of_defn< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > rc< / span > < span class = "plain-syntax" > )))< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > FALSE< / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > TRUE< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
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< span class = "reserved-syntax" > booking< / span > < span class = "plain-syntax" > *< / span > < span class = "function-syntax" > BookingLists::first< / span > < button class = "popup" onclick = "togglePopup('usagePopup7')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup7" > Usage of < span class = "code-font" > < span class = "function-syntax" > BookingLists::first< / span > < / span > :< br / > Rulebooks - < a href = "6-rlb.html#SP7" > § 7< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > booking_list< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > L< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > LOOP_OVER_BOOKINGS< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > br< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > L< / span > < span class = "plain-syntax" > ) < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > br< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
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< span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > BookingLists::is_empty_of_i7_rules< / span > < button class = "popup" onclick = "togglePopup('usagePopup8')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup8" > Usage of < span class = "code-font" > < span class = "function-syntax" > BookingLists::is_empty_of_i7_rules< / span > < / span > :< br / > Rulebooks - < a href = "6-rlb.html#SP7" > § 7< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > booking_list< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > L< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > LOOP_OVER_BOOKINGS< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > br< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > L< / span > < span class = "plain-syntax" > )< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < a href = "6-rls.html#SP9" class = "function-link" > < span class = "function-syntax" > Rules::get_imperative_definition< / span > < / a > < span class = "plain-syntax" > (< / span > < a href = "6-rb.html#SP4" class = "function-link" > < span class = "function-syntax" > RuleBookings::get_rule< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > br< / span > < span class = "plain-syntax" > )))< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > FALSE< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > TRUE< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
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< span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > BookingLists::contains< / span > < button class = "popup" onclick = "togglePopup('usagePopup9')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup9" > Usage of < span class = "code-font" > < span class = "function-syntax" > BookingLists::contains< / span > < / span > :< br / > Rulebooks - < a href = "6-rlb.html#SP7" > § 7< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > booking_list< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > L< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > rule< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > to_find< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > LOOP_OVER_BOOKINGS< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > br< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > L< / span > < span class = "plain-syntax" > )< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < a href = "6-rls.html#SP13" class = "function-link" > < span class = "function-syntax" > Rules::eq< / span > < / a > < span class = "plain-syntax" > (< / span > < a href = "6-rb.html#SP4" class = "function-link" > < span class = "function-syntax" > RuleBookings::get_rule< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > br< / span > < span class = "plain-syntax" > ), < / span > < span class = "identifier-syntax" > to_find< / span > < span class = "plain-syntax" > ))< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > TRUE< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > FALSE< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
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< span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > BookingLists::contains_ph< / span > < button class = "popup" onclick = "togglePopup('usagePopup10')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup10" > Usage of < span class = "code-font" > < span class = "function-syntax" > BookingLists::contains_ph< / span > < / span > :< br / > Rulebooks - < a href = "6-rlb.html#SP2_3" > § 2.3< / a > < br / > Focus and Outcome - < a href = "6-fao.html#SP5" > § 5< / a > , < a href = "6-fao.html#SP6" > § 6< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > booking_list< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > L< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > id_body< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > idb_to_find< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > LOOP_OVER_BOOKINGS< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > br< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > L< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > imperative_defn< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > id< / span > < span class = "plain-syntax" > = < / span > < a href = "6-rls.html#SP9" class = "function-link" > < span class = "function-syntax" > Rules::get_imperative_definition< / span > < / a > < span class = "plain-syntax" > (< / span > < a href = "6-rb.html#SP4" class = "function-link" > < span class = "function-syntax" > RuleBookings::get_rule< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > br< / span > < span class = "plain-syntax" > ));< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > ((< / span > < span class = "identifier-syntax" > id< / span > < span class = "plain-syntax" > ) & & (< / span > < span class = "identifier-syntax" > id< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > body_of_defn< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > idb_to_find< / span > < span class = "plain-syntax" > ))< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > TRUE< / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > }< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > FALSE< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
< / pre >
< p class = "commentary firstcommentary" > < a id = "SP8" class = "paragraph-anchor" > < / a > < b > § 8. Compilation of rule definitions for rulebook. < / b > There's no real need to do so, but we compile rule definitions in rulebook
order to make the compiled code more legible, and for the same reason we add
plenty of commentary.
< / p >
< pre class = "displayed-code all-displayed-code code-font" >
2021-03-21 01:55:57 +02:00
< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > BookingLists::compile< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > booking_list< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > L< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > max_i< / span > < span class = "plain-syntax" > ) {< / span >
2021-03-30 00:53:01 +03:00
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > t< / span > < span class = "plain-syntax" > = < / span > < a href = "6-bl.html#SP7" class = "function-link" > < span class = "function-syntax" > BookingLists::length< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > L< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > s< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > LOOP_OVER_BOOKINGS< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > br< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > L< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > s< / span > < span class = "plain-syntax" > ++;< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > RTRules::compile_comment< / span > < span class = "plain-syntax" > (< / span > < a href = "6-rb.html#SP4" class = "function-link" > < span class = "function-syntax" > RuleBookings::get_rule< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > br< / span > < span class = "plain-syntax" > ), < / span > < span class = "identifier-syntax" > s< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > t< / span > < span class = "plain-syntax" > );< / span >
2021-03-20 17:41:45 +02:00
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > br< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > next_booking< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > TEMPORARY_TEXT< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > C< / span > < span class = "plain-syntax" > )< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > br< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > placement< / span > < span class = "plain-syntax" > != < / span > < span class = "identifier-syntax" > br< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > next_booking< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > placement< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > WRITE_TO< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > C< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > "--- now the "< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > switch< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > br< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > next_booking< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > placement< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > case< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > FIRST_PLACEMENT:< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > WRITE_TO< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > C< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > "first-placed rules"< / span > < span class = "plain-syntax" > ); < / span > < span class = "reserved-syntax" > break< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > case< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > MIDDLE_PLACEMENT:< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > WRITE_TO< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > C< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > "mid-placed rules"< / span > < span class = "plain-syntax" > ); < / span > < span class = "reserved-syntax" > break< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > case< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > LAST_PLACEMENT:< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > WRITE_TO< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > C< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > "last-placed rules"< / span > < span class = "plain-syntax" > ); < / span > < span class = "reserved-syntax" > break< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > WRITE_TO< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > C< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > " ---"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Produce::comment< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Emit::tree< / span > < span class = "plain-syntax" > (), < / span > < span class = "identifier-syntax" > C< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > } < / span > < span class = "reserved-syntax" > else< / span > < span class = "plain-syntax" > {< / span >
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< span class = "plain-syntax" > < / span > < a href = "6-rb.html#SP8" class = "function-link" > < span class = "function-syntax" > RuleBookings::comment< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > C< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > br< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Str::len< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > C< / span > < span class = "plain-syntax" > ) > < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > Produce::comment< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Emit::tree< / span > < span class = "plain-syntax" > (), < / span > < span class = "identifier-syntax" > C< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > DISCARD_TEXT< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > C< / span > < span class = "plain-syntax" > )< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > t< / span > < span class = "plain-syntax" > > < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > CompiledText::divider_comment< / span > < span class = "plain-syntax" > ();< / span >
< span class = "plain-syntax" > }< / span >
< / pre >
< nav role = "progress" > < div class = "progresscontainer" >
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< ul class = "progressbar" > < li class = "progressprev" > < a href = "6-rb.html" > ❮ < / a > < / li > < li class = "progresschapter" > < a href = "P-wtmd.html" > P< / a > < / li > < li class = "progresschapter" > < a href = "1-am.html" > 1< / a > < / li > < li class = "progresschapter" > < a href = "2-bv.html" > 2< / a > < / li > < li class = "progresschapter" > < a href = "3-dlr.html" > 3< / a > < / li > < li class = "progresschapter" > < a href = "4-nr.html" > 4< / a > < / li > < li class = "progresschapter" > < a href = "5-id.html" > 5< / a > < / li > < li class = "progresscurrentchapter" > 6< / li > < li class = "progresssection" > < a href = "6-rls.html" > rls< / a > < / li > < li class = "progresssection" > < a href = "6-rb.html" > rb< / a > < / li > < li class = "progresscurrent" > bl< / li > < li class = "progresssection" > < a href = "6-rlb.html" > rlb< / a > < / li > < li class = "progresssection" > < a href = "6-fao.html" > fao< / a > < / li > < li class = "progresssection" > < a href = "6-act.html" > act< / a > < / li > < li class = "progresschapter" > < a href = "7-tc.html" > 7< / a > < / li > < li class = "progresschapter" > < a href = "8-kpr.html" > 8< / a > < / li > < li class = "progressnext" > < a href = "6-rlb.html" > ❯ < / a > < / li > < / ul > < / div >
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< / nav > <!-- End of weave -->
< / main >
< / body >
< / html >