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<!-- Weave of 'The Player' generated by Inweb -->
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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" > if< / a > < / li > < li > < a href = "index.html#3" > Chapter 3: Space and Time< / a > < / li > < li > < b > The Player< / b > < / li > < / ul > < / div >
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< p class = "purpose" > A plugin to give a special role to a person who is the protagonist.< / p >
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< ul class = "toc" > < li > < a href = "3-tp.html#SP1" > § 1. Introduction< / a > < / li > < li > < a href = "3-tp.html#SP2" > § 2. Variables of interest< / a > < / li > < li > < a href = "3-tp.html#SP4_1" > § 4.1. Instances of interest< / a > < / li > < li > < a href = "3-tp.html#SP7" > § 7. Linguistic variations< / a > < / li > < li > < a href = "3-tp.html#SP10" > § 10. Model completion< / 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 > The player is, in some ways, just another instance of the "person" kind, so
how hard can this be?
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< / p >
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< p class = "commentary" > One issue is that, uniquely of all instances in the world model, the player is not
explicitly created and located by the source text; it is simply implicit that
there is a player. Except, of course, that an author can sometimes write about
"the player" being a person who is indeed explicitly created; and can write
about "the player" as if this were a constant, when in fact it is a variable
because of the possibility of changing avatar in play. All in all, "the player"
has highly unusual semantics, even though an Inform user is barely aware of that.
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< / p >
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< 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" > Player::start< / 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" > Player::start< / span > < / span > :< br / > IF Module - < a href = "1-im.html#SP5" > § 5< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > PluginManager::plug< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > PRODUCTION_LINE_PLUG< / span > < span class = "plain-syntax" > , < / span > < a href = "3-tp.html#SP1" class = "function-link" > < span class = "function-syntax" > Player::production_line< / span > < / a > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > PluginManager::plug< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > NEW_VARIABLE_NOTIFY_PLUG< / span > < span class = "plain-syntax" > , < / span > < a href = "3-tp.html#SP4" class = "function-link" > < span class = "function-syntax" > Player::new_variable_notify< / span > < / a > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > PluginManager::plug< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > VARIABLE_VALUE_NOTIFY_PLUG< / span > < span class = "plain-syntax" > , < / span > < a href = "3-tp.html#SP5" class = "function-link" > < span class = "function-syntax" > Player::variable_set_warning< / span > < / a > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > PluginManager::plug< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > NEW_INSTANCE_NOTIFY_PLUG< / span > < span class = "plain-syntax" > , < / span > < a href = "3-tp.html#SP4_3" class = "function-link" > < span class = "function-syntax" > Player::new_instance_notify< / span > < / a > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > PluginManager::plug< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > IRREGULAR_GENITIVE_IN_ASSEMBLY_PLUG< / span > < span class = "plain-syntax" > , < / span > < a href = "3-tp.html#SP7" class = "function-link" > < span class = "function-syntax" > Player::irregular_genitive< / span > < / a > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > PluginManager::plug< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > COMPLETE_MODEL_PLUG< / span > < span class = "plain-syntax" > , < / span > < a href = "3-tp.html#SP10" class = "function-link" > < span class = "function-syntax" > Player::complete_model< / span > < / a > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > PluginManager::plug< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > REFINE_IMPLICIT_NOUN_PLUG< / span > < span class = "plain-syntax" > , < / span > < a href = "3-tp.html#SP9" class = "function-link" > < span class = "function-syntax" > Player::refine_implicit_noun< / span > < / a > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > PluginManager::plug< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > DETECT_BODYSNATCHING_PLUG< / span > < span class = "plain-syntax" > , < / span > < a href = "3-tp.html#SP6" class = "function-link" > < span class = "function-syntax" > Player::detect_bodysnatching< / span > < / a > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > }< / span >
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< span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > Player::production_line< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > stage< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > debugging< / span > < span class = "plain-syntax" > ,< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > stopwatch_timer< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > sequence_timer< / 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" > stage< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > TABLES_CSEQ< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > BENCH< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > RTPlayer::InitialSituation< / 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" > 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 = "SP2" class = "paragraph-anchor" > < / a > < b > § 2. Variables of interest. < / b > "Time of day" is a perfectly normal variable, and we only note down its
identity in order to find out if the author is setting an initial time of day.
"Player", though, behaves quite unusually: see above.
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< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
< span class = "identifier-syntax" > nonlocal_variable< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > player_VAR< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ;< / span >
< span class = "identifier-syntax" > nonlocal_variable< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > time_of_day_VAR< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ;< / span >
< / pre >
< p class = "commentary firstcommentary" > < a id = "SP3" class = "paragraph-anchor" > < / a > < b > § 3. < / b > As usual, no need to translate these; they are created in English.
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< / p >
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< pre class = "Preform-displayed-code all-displayed-code code-font" >
< span class = "Preform-function-syntax" > < notable-player-variables> < / span > < span class = "Preform-plain-syntax" > < / span > < span class = "Preform-reserved-syntax" > ::=< / span >
< span class = "Preform-plain-syntax" > < / span > < span class = "Preform-constant-syntax" > player< / span > < span class = "Preform-plain-syntax" > < / span > < span class = "Preform-reserved-syntax" > |< / span >
< span class = "Preform-plain-syntax" > < / span > < span class = "Preform-constant-syntax" > time< / span > < span class = "Preform-plain-syntax" > < / span > < span class = "Preform-constant-syntax" > of< / span > < span class = "Preform-plain-syntax" > < / span > < span class = "Preform-constant-syntax" > day< / span >
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< / pre >
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< ul class = "endnotetexts" > < li > This is < a href = "../words-module/4-ap.html" class = "internal" > Preform grammar< / a > , not regular C code.< / li > < / ul >
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< p class = "commentary firstcommentary" > < a id = "SP4" class = "paragraph-anchor" > < / a > < b > § 4. < / b > < / p >
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< 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" > Player::new_variable_notify< / 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" > Player::new_variable_notify< / span > < / span > :< br / > < a href = "3-tp.html#SP1" > § 1< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > nonlocal_variable< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > nlv< / 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 = "function-syntax" > < notable-player-variables> (nlv-> < / span > < span class = "element-syntax" > name< / span > < span class = "plain-syntax" > )) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > switch< / span > < span class = "plain-syntax" > (< / span > < span class = "function-syntax" > < < r> > < / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > case< / 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" > player_VAR< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > nlv< / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > RTPlayer::player_schema< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > player_VAR< / 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_yourself< / span > < span class = "plain-syntax" > ) < / span > < span class = "named-paragraph-container code-font" > < a href = "3-tp.html#SP4_4" class = "named-paragraph-link" > < span class = "named-paragraph" > Alias the player variable to the yourself object< / span > < span class = "named-paragraph-number" > 4.4< / span > < / a > < / span > < span class = "plain-syntax" > ;< / span >
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< 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 = "constant-syntax" > 1< / span > < span class = "plain-syntax" > :< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > time_of_day_VAR< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > nlv< / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > RTVariables::make_initialisable< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > time_of_day_VAR< / span > < span class = "plain-syntax" > );< / span >
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< 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 = "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 = "SP4_1" class = "paragraph-anchor" > < / a > < b > § 4.1. Instances of interest. < / b > Altogether we keep track of four instances, though the first pair often coincide,
and so do the second pair.
< / p >
< pre class = "displayed-code all-displayed-code code-font" >
< span class = "identifier-syntax" > instance< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > start_room< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ; < / span > < span class = "comment-syntax" > room in which play begins: e.g., Barber's Shop< / span >
< span class = "identifier-syntax" > instance< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > start_object< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ; < / span > < span class = "comment-syntax" > object in which play begins: e.g., a barber's chair< / span >
< span class = "identifier-syntax" > instance< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > player_character_object< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ; < / span > < span class = "comment-syntax" > the player character object used in this run< / span >
< span class = "identifier-syntax" > instance< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > I_yourself< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ; < / span > < span class = "comment-syntax" > the default player character object, < / span > < span class = "extract" > < span class = "extract-syntax" > selfobj< / span > < / span > < span class = "comment-syntax" > in I6< / span >
< / pre >
< p class = "commentary firstcommentary" > < a id = "SP4_2" class = "paragraph-anchor" > < / a > < b > § 4.2. < / b > The "yourself" instance is special in being tied, or "aliased", to the
"player" variable, so Inform needs to recognise it. (No need to translate; it
is created in English.)
< / p >
< pre class = "Preform-displayed-code all-displayed-code code-font" >
< span class = "Preform-function-syntax" > < notable-player-instances> < / span > < span class = "Preform-plain-syntax" > < / span > < span class = "Preform-reserved-syntax" > ::=< / span >
< span class = "Preform-plain-syntax" > < / span > < span class = "Preform-constant-syntax" > yourself< / span >
< / pre >
< ul class = "endnotetexts" > < li > This is < a href = "../words-module/4-ap.html" class = "internal" > Preform grammar< / a > , not regular C code.< / li > < / ul >
< p class = "commentary firstcommentary" > < a id = "SP4_3" class = "paragraph-anchor" > < / a > < b > § 4.3. < / 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" > Player::new_instance_notify< / 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" > Player::new_instance_notify< / span > < / span > :< br / > < a href = "3-tp.html#SP1" > § 1< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > instance< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > inst< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > wording< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > IW< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > Instances::get_name< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > inst< / 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" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "function-syntax" > < notable-player-instances> < / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > IW< / span > < span class = "plain-syntax" > )) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > I_yourself< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > inst< / span > < span class = "plain-syntax" > ; < / span > < span class = "identifier-syntax" > player_character_object< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > I_yourself< / 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" > player_VAR< / span > < span class = "plain-syntax" > ) < / span > < span class = "named-paragraph-container code-font" > < a href = "3-tp.html#SP4_4" class = "named-paragraph-link" > < span class = "named-paragraph" > Alias the player variable to the yourself object< / span > < span class = "named-paragraph-number" > 4.4< / span > < / a > < / 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" > FALSE< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
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< span class = "identifier-syntax" > instance< / span > < span class = "plain-syntax" > *< / span > < span class = "function-syntax" > Player::get_start_room< / 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" > Player::get_start_room< / span > < / span > :< br / > Spatial Model - < a href = "3-sm.html#SP40" > § 40< / 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" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > start_room< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
< / pre >
< p class = "commentary firstcommentary" > < a id = "SP4_4" class = "paragraph-anchor" > < / a > < b > § 4.4. < / b > As can be seen, as soon as both "yourself" (object) and "player" (variable)
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have been created, they are aliased together. This is a form of tacit pointer
dereferencing, though authors probably don't think of it that way. A normal
object variable is like a pointer to an object, rather than an object itself,
and so the following doesn't make sense:
< / p >
< blockquote >
< p > The top prize is an object that varies. The top prize is in the desk drawer.< / p >
< / blockquote >
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< p class = "commentary" > Clearly something goes in the desk drawer, but it's quite ambiguous what: the
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problem is that "top prize" describes some object, but it's not clear which.
(Inform generally disallows this even if the source text explicitly gives a
value for top prize.) But "player" is unusual because Inform authors are
encouraged always to describe the player object that way, and often don't
realise that it's a variable at all — and most of the time it never changes
its value, of course, but simply remains equal to "yourself" throughout play.
So we want to allow this sort of thing:
< / p >
< blockquote >
< p > The player is in the Cage.< / p >
< / blockquote >
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< p class = "commentary" > even though it has exactly the same problem as the top prize. We get around
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this by treating "player", in assertions, as if it were its own initial
value ("yourself") — in effect, we silently dereference it. This is
aliasing.
< / p >
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< p class = "commentary" > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Alias the player variable to the yourself object< / span > < span class = "named-paragraph-number" > 4.4< / span > < / span > < span class = "comment-syntax" > =< / span >
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< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > inference_subject< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > subj< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > Instances::as_subject< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > I_yourself< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > InferenceSubjects::alias_to_nonlocal_variable< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > subj< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > player_VAR< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > NonlocalVariables::set_alias< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > player_VAR< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > subj< / 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 = "3-tp.html#SP4" > § 4< / a > , < a href = "3-tp.html#SP4_3" > § 4.3< / a > .< / li > < / ul >
< p class = "commentary firstcommentary" > < a id = "SP5" class = "paragraph-anchor" > < / a > < b > § 5. < / b > We also, though, want to look out for this sort of thing:
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< / p >
< blockquote >
< p > The player is Lord Collingwood.< / p >
< / blockquote >
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< p class = "commentary" > because an assertion like this causes < span class = "extract" > < span class = "extract-syntax" > player_character_object< / span > < / span > to diverge from
< span class = "extract" > < span class = "extract-syntax" > I_yourself< / span > < / span > ; here of course it becomes the Lord Collingwood object.
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< / p >
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< 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" > Player::variable_set_warning< / 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" > Player::variable_set_warning< / span > < / span > :< br / > < a href = "3-tp.html#SP1" > § 1< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > nonlocal_variable< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > nlv< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > parse_node< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > val< / 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" > nlv< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > player_VAR< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > instance< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > npc< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > Rvalues::to_object_instance< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > val< / 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" > npc< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > player_character_object< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > npc< / 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 >
< 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 = "SP6" class = "paragraph-anchor" > < / a > < b > § 6. < / b > But it gets worse: as well as aliasing, there is bodysnatching. Our problem
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is that once the author has written "The player is Lord Collingwood.", it's
clear that the "yourself" object shouldn't appear anywhere. But there are
two problems with that: one, the I6 template code needs it to exist, even if
it isn't in the model world; and two, we've just aliased "player" to it.
< / p >
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< p class = "commentary" > Bodysnatching allows one object (the "snatcher") to take over the life of
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another (the "victim"), so that inferences made about the victim are diverted
to the snatcher. Thus if the source text reads:
< / p >
< blockquote >
< p > The player is Lord Collingwood. The player carries a spyglass.< / p >
< / blockquote >
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< p class = "commentary" > the second sentence goes through two transformations: first, because of
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aliasing, Inform decides to draw an inference about "yourself", rather
than complaining that "player" is indefinite; and second, because of
bodysnatching, the Collingwood object (snatcher) takes over the inference
from the yourself object (victim). So Collingwood gets the spyglass, as
the source text clearly intended.
< / p >
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< p class = "commentary" > Bodysnatching is used only when < span class = "extract" > < span class = "extract-syntax" > player_character_object< / span > < / span > differs from < span class = "extract" > < span class = "extract-syntax" > I_yourself< / span > < / span > ,
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that is, when the source text explicitly sets a value for "player".
< / p >
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< 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" > Player::detect_bodysnatching< / 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" > Player::detect_bodysnatching< / span > < / span > :< br / > < a href = "3-tp.html#SP1" > § 1< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > inference_subject< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > body< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > snatcher< / span > < span class = "plain-syntax" > ,< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > inference_subject< / span > < span class = "plain-syntax" > **< / span > < span class = "identifier-syntax" > counterpart< / 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" > player_character_object< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > I_yourself< / span > < span class = "plain-syntax" > ) ||< / span >
< span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > player_character_object< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ) || (< / span > < span class = "identifier-syntax" > I_yourself< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > NULL< / 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 > < span class = "identifier-syntax" > kind< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > KP< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > Instances::to_kind< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > player_character_object< / 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" > KY< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > Instances::to_kind< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > I_yourself< / 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" > Kinds::conforms_to< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > KP< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > KY< / span > < span class = "plain-syntax" > )) & & (< / span > < span class = "identifier-syntax" > Kinds::ne< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > KP< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > KY< / 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" > body< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > Instances::as_subject< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > player_character_object< / span > < span class = "plain-syntax" > )) {< / span >
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< span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > snatcher< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > FALSE< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > counterpart< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > Instances::as_subject< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > I_yourself< / 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 = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > body< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > Instances::as_subject< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > I_yourself< / span > < span class = "plain-syntax" > )) {< / span >
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< span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > snatcher< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > TRUE< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > counterpart< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > Instances::as_subject< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > player_character_object< / 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 = "plain-syntax" > } < / span > < span class = "reserved-syntax" > else< / 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" > body< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > Instances::as_subject< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > player_character_object< / span > < span class = "plain-syntax" > )) {< / span >
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< span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > snatcher< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > TRUE< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > counterpart< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > Instances::as_subject< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > I_yourself< / 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 = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > body< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > Instances::as_subject< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > I_yourself< / span > < span class = "plain-syntax" > )) {< / span >
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< span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > snatcher< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > FALSE< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > counterpart< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > Instances::as_subject< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > player_character_object< / 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 = "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" class = "paragraph-anchor" > < / a > < b > § 7. Linguistic variations. < / b > Thankfully everything else is straightforward. The following is used to
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ensure that assemblies such as "A nose is part of every person" produces
"your nose" rather than "yourself's nose":
< / p >
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< 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" > Player::irregular_genitive< / 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" > Player::irregular_genitive< / span > < / span > :< br / > < a href = "3-tp.html#SP1" > § 1< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > inference_subject< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > owner< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > text_stream< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > genitive< / 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" > propriety< / 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" > owner< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > Instances::as_subject< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > I_yourself< / 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" > genitive< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > "your "< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > propriety< / 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" > TRUE< / 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" > player_character_object< / span > < span class = "plain-syntax" > ) & & (< / span > < span class = "identifier-syntax" > I_yourself< / span > < span class = "plain-syntax" > ) & & < / span >
< span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > player_character_object< / span > < span class = "plain-syntax" > != < / span > < span class = "identifier-syntax" > I_yourself< / span > < span class = "plain-syntax" > ) & & < / span >
< span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > owner< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > Instances::as_subject< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > player_character_object< / 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" > genitive< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > "your "< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > propriety< / 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" > TRUE< / 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" > 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 = "SP8" class = "paragraph-anchor" > < / a > < b > § 8. < / b > The adjectives "worn" and "carried" — as in, "The nautical chart is
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carried." — implicitly refer to the player as the unstated term in the
relationship; that makes them our business here. "Initially carried" is
now deprecated, but is provided as synonymous with "carried" because it
was once an either/or property in the clumsier early stages of Inform 7,
and people still sometimes type it.
< / p >
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< pre class = "Preform-displayed-code all-displayed-code code-font" >
< span class = "Preform-function-syntax" > < implicit-player-relationship> < / span > < span class = "Preform-plain-syntax" > < / span > < span class = "Preform-reserved-syntax" > ::=< / span >
< span class = "Preform-plain-syntax" > < / span > < span class = "Preform-constant-syntax" > worn< / span > < span class = "Preform-plain-syntax" > < / span > < span class = "Preform-reserved-syntax" > |< / span >
< span class = "Preform-plain-syntax" > < / span > < span class = "Preform-constant-syntax" > carried< / span > < span class = "Preform-plain-syntax" > < / span > < span class = "Preform-reserved-syntax" > |< / span >
< span class = "Preform-plain-syntax" > < / span > < span class = "Preform-constant-syntax" > initially< / span > < span class = "Preform-plain-syntax" > < / span > < span class = "Preform-constant-syntax" > carried< / span >
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< / pre >
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< ul class = "endnotetexts" > < li > This is < a href = "../words-module/4-ap.html" class = "internal" > Preform grammar< / a > , not regular C code.< / li > < / ul >
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< p class = "commentary firstcommentary" > < a id = "SP9" class = "paragraph-anchor" > < / a > < b > § 9. < / b > < / p >
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< 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" > Player::refine_implicit_noun< / 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" > Player::refine_implicit_noun< / span > < / span > :< br / > < a href = "3-tp.html#SP1" > § 1< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > parse_node< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > p< / 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 = "function-syntax" > < implicit-player-relationship> < / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Node::get_text< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > ))) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Refiner::give_subject_to_noun< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > Instances::as_subject< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > player_character_object< / 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 = "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 = "SP10" class = "paragraph-anchor" > < / a > < b > § 10. Model completion. < / b > At stage III, we add a property to make things work out nicely in the event
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of a change of player.
< / p >
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< p class = "commentary" > Otherwise we take no interest until stage IV, a point at which kinds of
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objects and the spatial model for them are both completely worked out. We
won't change anything: all we will do is calculate the start object and the
start room by looking at where the player sits in the spatial model.
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< / p >
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< p class = "commentary" > Very often, the source text doesn't specify where the player is, and then
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we assume he is freestanding in the earliest defined room.
< / p >
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< 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" > Player::complete_model< / 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" > Player::complete_model< / span > < / span > :< br / > < a href = "3-tp.html#SP1" > § 1< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > stage< / 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" > stage< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > WORLD_STAGE_III< / span > < span class = "plain-syntax" > ) & & (< / span > < span class = "identifier-syntax" > I_yourself< / span > < span class = "plain-syntax" > )) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > property< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > P_ssn< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > ValueProperties::new_nameless< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > I< / span > < span class = "string-syntax" > "saved_short_name"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > K_text< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > ValueProperties::assert< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > P_ssn< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > Instances::as_subject< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > I_yourself< / span > < span class = "plain-syntax" > ),< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Rvalues::from_unescaped_wording< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Feeds::feed_text< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > I< / span > < span class = "string-syntax" > "yourself"< / span > < span class = "plain-syntax" > )), < / span > < span class = "identifier-syntax" > CERTAIN_CE< / 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" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > stage< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > WORLD_STAGE_IV< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "named-paragraph-container code-font" > < a href = "3-tp.html#SP10_1" class = "named-paragraph-link" > < span class = "named-paragraph" > Set the start room to the earliest room defined in the source text< / span > < span class = "named-paragraph-number" > 10.1< / span > < / a > < / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "named-paragraph-container code-font" > < a href = "3-tp.html#SP10_2" class = "named-paragraph-link" > < span class = "named-paragraph" > If the start room is still null, there's no room, so issue a problem< / span > < span class = "named-paragraph-number" > 10.2< / span > < / a > < / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "named-paragraph-container code-font" > < a href = "3-tp.html#SP10_3" class = "named-paragraph-link" > < span class = "named-paragraph" > Otherwise see if the player has explicitly been placed in the model world< / span > < span class = "named-paragraph-number" > 10.3< / span > < / a > < / 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" > 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 = "SP10_1" class = "paragraph-anchor" > < / a > < b > § 10.1. < / b > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Set the start room to the earliest room defined in the source text< / span > < span class = "named-paragraph-number" > 10.1< / span > < / span > < span class = "comment-syntax" > =< / span >
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< / p >
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2020-05-03 03:01:21 +03:00
< pre class = "displayed-code all-displayed-code code-font" >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > instance< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > I< / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > LOOP_OVER_INSTANCES< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > I< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > K_object< / 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 = "3-sm.html#SP7" class = "function-link" > < span class = "function-syntax" > Spatial::object_is_a_room< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > I< / span > < span class = "plain-syntax" > )) & & (< / span > < span class = "identifier-syntax" > start_room< / 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" > Projects::draws_from_source_file< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Task::project< / span > < span class = "plain-syntax" > (),< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Instances::get_creating_file< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > I< / span > < span class = "plain-syntax" > ))))< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > start_room< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > I< / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > LOOP_OVER_INSTANCES< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > I< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > K_object< / 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 = "3-sm.html#SP7" class = "function-link" > < span class = "function-syntax" > Spatial::object_is_a_room< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > I< / span > < span class = "plain-syntax" > )) & & (< / span > < span class = "identifier-syntax" > start_room< / span > < 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 = "identifier-syntax" > start_room< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > I< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > start_object< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > start_room< / 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 = "3-tp.html#SP10" > § 10< / a > .< / li > < / ul >
< p class = "commentary firstcommentary" > < a id = "SP10_2" class = "paragraph-anchor" > < / a > < b > § 10.2. < / b > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > If the start room is still null, there's no room, so issue a problem< / span > < span class = "named-paragraph-number" > 10.2< / span > < / span > < span class = "comment-syntax" > =< / span >
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< / p >
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< 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" > start_room< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ) & & (< / span > < span class = "identifier-syntax" > Task::wraps_existing_storyfile< / 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 = "identifier-syntax" > StandardProblems::unlocated_problem< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Task::syntax_tree< / span > < span class = "plain-syntax" > (), < / span > < span class = "identifier-syntax" > _p_< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > PM_NoStartRoom< / span > < span class = "plain-syntax" > ),< / span >
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< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "There doesn't seem to be any location in this story, so there's "< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "nowhere for the player to begin. This may be because I have "< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "misunderstood what was meant to be a room and what wasn't: I "< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "only know something is a room if you tell me explicitly ('The "< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "Observatory is a room') or if you imply it by giving map "< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "directions ('East of the Observatory is the Planetarium')."< / 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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< ul class = "endnotetexts" > < li > This code is used in < a href = "3-tp.html#SP10" > § 10< / a > .< / li > < / ul >
< p class = "commentary firstcommentary" > < a id = "SP10_3" class = "paragraph-anchor" > < / a > < b > § 10.3. < / b > If the source text said nothing about the player's location, then the
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player object will be a disconnected node in the containment tree: it will,
in fact, have no progenitor. In that event, the start room already calculated
will do. But otherwise:
< / p >
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< p class = "commentary" > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Otherwise see if the player has explicitly been placed in the model world< / span > < span class = "named-paragraph-number" > 10.3< / span > < / span > < span class = "comment-syntax" > =< / span >
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< / p >
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< 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" > player_character_object< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > start_object< / span > < span class = "plain-syntax" > = < / span > < a href = "3-sm.html#SP28" class = "function-link" > < span class = "function-syntax" > Spatial::progenitor< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > player_character_object< / 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" > start_object< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > start_room< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > start_object< / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > while< / span > < span class = "plain-syntax" > ((< / span > < span class = "identifier-syntax" > start_room< / span > < span class = "plain-syntax" > ) & & (< / span > < a href = "3-sm.html#SP28" class = "function-link" > < span class = "function-syntax" > Spatial::progenitor< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > start_room< / span > < span class = "plain-syntax" > )))< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > start_room< / span > < span class = "plain-syntax" > = < / span > < a href = "3-sm.html#SP28" class = "function-link" > < span class = "function-syntax" > Spatial::progenitor< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > start_room< / 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" > start_room< / span > < span class = "plain-syntax" > ) & & (< / span > < a href = "3-sm.html#SP7" class = "function-link" > < span class = "function-syntax" > Spatial::object_is_a_room< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > start_room< / 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 = "identifier-syntax" > StandardProblems::object_problem< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > _p_< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > PM_StartsOutsideRooms< / span > < span class = "plain-syntax" > ),< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > start_object< / span > < span class = "plain-syntax" > ,< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "seems to be where the player is supposed to begin"< / span > < span class = "plain-syntax" > ,< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "but (so far as I know) it is not a room, nor is it ultimately "< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "contained inside a room."< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > inference< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > inf< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > POSITIVE_KNOWLEDGE_LOOP< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > inf< / span > < span class = "plain-syntax" > ,< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Instances::as_subject< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > player_character_object< / span > < span class = "plain-syntax" > ), < / span > < span class = "identifier-syntax" > part_of_inf< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > StandardProblems::object_problem< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > _p_< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > PM_PlayerIsPart< / span > < span class = "plain-syntax" > ),< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > start_object< / span > < span class = "plain-syntax" > ,< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "seems to have the player attached as a component part"< / span > < span class = "plain-syntax" > ,< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "which is not allowed. The player can be in a room, or "< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "inside a container, or on a supporter, but can't be part "< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "of something."< / span > < span class = "plain-syntax" > );< / 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 = "3-tp.html#SP10" > § 10< / a > .< / li > < / ul >
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< / nav > <!-- End of weave -->
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< / body >
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