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<!-- Weave of 'Comparative Relations' generated by Inweb -->
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< ul class = "crumbs" > < li > < a href = "../index.html" > Home< / a > < / li > < li > < a href = "../compiler.html" > Inform7 Modules< / a > < / li > < li > < a href = "index.html" > core< / a > < / li > < li > < a href = "index.html#15" > Chapter 15: Properties< / a > < / li > < li > < b > Comparative Relations< / b > < / li > < / ul > < / div >
< p class = "purpose" > When a measurement adjective like "tall" is defined, so is a comparative relation like "taller than".< / p >
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< ul class = "toc" > < li > < a href = "15-cr.html#SP1" > § 1. Definitions< / a > < / li > < li > < a href = "15-cr.html#SP3" > § 3. Initial stock< / a > < / li > < li > < a href = "15-cr.html#SP4" > § 4. Second stock< / a > < / li > < li > < a href = "15-cr.html#SP5" > § 5. Typechecking< / a > < / li > < li > < a href = "15-cr.html#SP6" > § 6. Assertion< / a > < / li > < li > < a href = "15-cr.html#SP7" > § 7. Compilation< / a > < / li > < li > < a href = "15-cr.html#SP8" > § 8. Problem message text< / a > < / li > < / ul > < hr class = "tocbar" >
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< p class = "commentary firstcommentary" > < a id = "SP1" > < / a > < b > § 1. Definitions. < / b > < / p >
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< p class = "commentary firstcommentary" > < a id = "SP2" > < / a > < b > § 2. < / b > This section handles the < span class = "extract" > < span class = "extract-syntax" > PROPERTY_COMPARISON_KBP< / span > < / span > relations. Unlike the
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other relations to do with property values, these do not correspond exactly
with the properties. Some properties, like "carrying capacity", might
never be compared with measurement adjectives; others, like "height", might
be compared with more than one ("short", "tall").
< / p >
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< p class = "commentary firstcommentary" > < a id = "SP3" > < / a > < b > § 3. Initial stock. < / b > There is no initial stock of these, since there are no value properties yet
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when Inform starts up.
< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > Properties::ComparativeRelations::REL_create_initial_stock< / 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" > Properties::ComparativeRelations::REL_create_initial_stock< / span > < / span > :< br / > Binary Predicates - < a href = "6-bp.html#SP45" > § 45< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > }< / span >
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< / pre >
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< p class = "commentary firstcommentary" > < a id = "SP4" > < / a > < b > § 4. Second stock. < / b > When an adjective is defined so that it performs an inequality comparison
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of a property value, like so:
< / p >
< blockquote >
< p > Definition: A woman is tall if her height is 68 or more.< / p >
< / blockquote >
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< p class = "commentary" > ...Inform automatically generates a comparative form (here "taller than").
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This is where our comparative relations come from, but the work is done in
the previous section.
< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > Properties::ComparativeRelations::REL_create_second_stock< / 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" > Properties::ComparativeRelations::REL_create_second_stock< / span > < / span > :< br / > Binary Predicates - < a href = "6-bp.html#SP46" > § 46< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < a href = "15-ma.html#SP14" class = "function-link" > < span class = "function-syntax" > Properties::Measurement::create_comparatives< / span > < / a > < span class = "plain-syntax" > ();< / span >
< span class = "plain-syntax" > }< / span >
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< / pre >
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< p class = "commentary firstcommentary" > < a id = "SP5" > < / a > < b > § 5. Typechecking. < / b > Because of the ambiguity between absolute and relative comparisons (see
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below), we'll typecheck this asymmetrically; the left term is typechecked
as usual, but the right is more leniently handled.
< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
< span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > Properties::ComparativeRelations::REL_typecheck< / 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" > Properties::ComparativeRelations::REL_typecheck< / span > < / span > :< br / > Binary Predicates - < a href = "6-bp.html#SP47" > § 47< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > binary_predicate< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > bp< / span > < span class = "plain-syntax" > ,< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > kind< / span > < span class = "plain-syntax" > **< / span > < span class = "identifier-syntax" > kinds_of_terms< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > kind< / span > < span class = "plain-syntax" > **< / span > < span class = "identifier-syntax" > kinds_required< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > tc_problem_kit< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > tck< / 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" > kinds_required< / span > < span class = "plain-syntax" > [0]) & & < / span >
< span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Kinds::Compare::compatible< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > kinds_of_terms< / span > < span class = "plain-syntax" > [0], < / span > < span class = "identifier-syntax" > kinds_required< / span > < span class = "plain-syntax" > [0]) == < / span > < span class = "identifier-syntax" > NEVER_MATCH< / 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" > "Term 0 is $u not $u\n"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > kinds_of_terms< / span > < span class = "plain-syntax" > [0], < / span > < span class = "identifier-syntax" > kinds_required< / span > < span class = "plain-syntax" > [0]);< / span >
< span class = "plain-syntax" > < / span > < a href = "11-tcp.html#SP12" class = "function-link" > < span class = "function-syntax" > Calculus::Propositions::Checker::issue_bp_typecheck_error< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > bp< / span > < span class = "plain-syntax" > ,< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > kinds_of_terms< / span > < span class = "plain-syntax" > [0], < / span > < span class = "identifier-syntax" > kinds_of_terms< / span > < span class = "plain-syntax" > [1], < / span > < span class = "identifier-syntax" > tck< / 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" > NEVER_MATCH< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > property< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > prn< / span > < span class = "plain-syntax" > = < / span > < a href = "15-cp.html#SP5" class = "function-link" > < span class = "function-syntax" > Properties::Conditions::get_coinciding_property< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > kinds_of_terms< / span > < span class = "plain-syntax" > [1]);< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > ((< / span > < span class = "identifier-syntax" > prn< / span > < span class = "plain-syntax" > ) & & (< / span > < span class = "identifier-syntax" > prn< / span > < span class = "plain-syntax" > != < / span > < span class = "identifier-syntax" > bp< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > comparative_property< / 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" > tck< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > log_to_I6_text< / 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" > "Comparative misapplied to $Y not $Y\n"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > prn< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > bp< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > comparative_property< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < a href = "2-sq.html#SP2" class = "function-link" > < span class = "function-syntax" > Problems::quote_property< / span > < / a > < span class = "plain-syntax" > (4, < / span > < span class = "identifier-syntax" > bp< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > comparative_property< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < a href = "2-sq.html#SP2" class = "function-link" > < span class = "function-syntax" > Problems::quote_property< / span > < / a > < span class = "plain-syntax" > (5, < / span > < span class = "identifier-syntax" > prn< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < a href = "2-si.html#SP6" class = "function-link" > < span class = "function-syntax" > Problems::Issue::tcp_problem< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > _p_< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > PM_ComparativeMisapplied< / span > < span class = "plain-syntax" > ), < / span > < span class = "identifier-syntax" > tck< / span > < span class = "plain-syntax" > ,< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "that ought to make a comparison of %4 not %5."< / 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" > NEVER_MATCH< / 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 = "identifier-syntax" > ALWAYS_MATCH< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
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< / pre >
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< p class = "commentary firstcommentary" > < a id = "SP6" > < / a > < b > § 6. Assertion. < / b > < / p >
< pre class = "displayed-code all-displayed-code code-font" >
< span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > Properties::ComparativeRelations::REL_assert< / 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" > Properties::ComparativeRelations::REL_assert< / span > < / span > :< br / > Binary Predicates - < a href = "6-bp.html#SP47" > § 47< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > binary_predicate< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > bp< / span > < span class = "plain-syntax" > ,< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > inference_subject< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > infs0< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > parse_node< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > spec0< / span > < span class = "plain-syntax" > ,< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > inference_subject< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > infs1< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > parse_node< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > spec1< / 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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< / pre >
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< p class = "commentary firstcommentary" > < a id = "SP7" > < / a > < b > § 7. Compilation. < / b > We need do nothing special: these relations can be compiled from their schemas.
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< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
< span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > Properties::ComparativeRelations::REL_compile< / 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" > Properties::ComparativeRelations::REL_compile< / span > < / span > :< br / > Binary Predicates - < a href = "6-bp.html#SP47" > § 47< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > task< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > binary_predicate< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > bp< / span > < span class = "plain-syntax" > ,< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > annotated_i6_schema< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > asch< / 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" > task< / span > < span class = "plain-syntax" > == < / span > < span class = "constant-syntax" > TEST_ATOM_TASK< / span > < span class = "plain-syntax" > )< / span >
< span class = "plain-syntax" > < / span > < span class = "named-paragraph-container code-font" > < a href = "15-cr.html#SP7_1" class = "named-paragraph-link" > < span class = "named-paragraph" > Rewrite the annotated schema if it turns out to be an absolute comparison< / span > < span class = "named-paragraph-number" > 7.1< / span > < / a > < / 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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< / pre >
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< p class = "commentary firstcommentary" > < a id = "SP7_1" > < / a > < b > § 7.1. < / b > Normally, "taller than" would relate two people, and compare their heights.
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But we also want to allow absolute comparison like this one:
< / p >
< blockquote >
< p > if Geoff is taller than 4 foot 5 inches, ...< / p >
< / blockquote >
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< p class = "commentary" > In that case we need a different schema, where right and left are not handled
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so symmetrically; we rewrite the annotated schema on the fly.
< / p >
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< p class = "commentary" > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Rewrite the annotated schema if it turns out to be an absolute comparison< / span > < span class = "named-paragraph-number" > 7.1< / span > < / span > < span class = "comment-syntax" > =< / span >
< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > kind< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > st< / span > < span class = "plain-syntax" > [2];< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > st< / span > < span class = "plain-syntax" > [0] = < / span > < a href = "12-cad.html#SP6" class = "function-link" > < span class = "function-syntax" > Calculus::Deferrals::Cinders::kind_of_value_of_term< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > asch< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > pt0< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > st< / span > < span class = "plain-syntax" > [1] = < / span > < a href = "12-cad.html#SP6" class = "function-link" > < span class = "function-syntax" > Calculus::Deferrals::Cinders::kind_of_value_of_term< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > asch< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > pt1< / 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" > Kinds::Compare::eq< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > st< / span > < span class = "plain-syntax" > [0], < / span > < span class = "identifier-syntax" > st< / span > < span class = "plain-syntax" > [1]) == < / span > < span class = "identifier-syntax" > FALSE< / span > < span class = "plain-syntax" > ) & & < / span >
< span class = "plain-syntax" > (< / span > < a href = "15-cp.html#SP5" class = "function-link" > < span class = "function-syntax" > Properties::Conditions::name_can_coincide_with_property< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > st< / span > < span class = "plain-syntax" > [1]))) {< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > property< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > prn< / span > < span class = "plain-syntax" > = < / span > < a href = "15-cp.html#SP5" class = "function-link" > < span class = "function-syntax" > Properties::Conditions::get_coinciding_property< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > st< / span > < span class = "plain-syntax" > [1]);< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > prn< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < a href = "12-is.html#SP4_1" class = "function-link" > < span class = "function-syntax" > Calculus::Schemas::modify< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > asch< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > schema< / span > < span class = "plain-syntax" > ,< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "*1.%n %s *2"< / span > < span class = "plain-syntax" > , < / span > < a href = "15-pr.html#SP27" class = "function-link" > < span class = "function-syntax" > Properties::iname< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > prn< / span > < span class = "plain-syntax" > ),< / span >
< span class = "plain-syntax" > < / span > < a href = "15-ma.html#SP5" class = "function-link" > < span class = "function-syntax" > Properties::Measurement::strict_comparison< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > bp< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > comparison_sign< / 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 >
< 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 = "15-cr.html#SP7" > § 7< / a > .< / li > < / ul >
< p class = "commentary firstcommentary" > < a id = "SP8" > < / a > < b > § 8. Problem message text. < / b > < / p >
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< pre class = "displayed-code all-displayed-code code-font" >
< span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > Properties::ComparativeRelations::REL_describe_for_problems< / 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" > Properties::ComparativeRelations::REL_describe_for_problems< / span > < / span > :< br / > Binary Predicates - < a href = "6-bp.html#SP47" > § 47< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > OUTPUT_STREAM< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > binary_predicate< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > bp< / 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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< / pre >
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