2021-02-27 18:52:18 +02:00
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<!-- Weave of 'Action Variables' 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#4" > Chapter 4: Actions< / a > < / li > < li > < b > Action Variables< / b > < / li > < / ul > < / div >
< p class = "purpose" > Variables shared by the rules of the rulebooks processing an action.< / p >
< p class = "commentary firstcommentary" > < a id = "SP1" class = "paragraph-anchor" > < / a > < b > § 1. < / b > Action names, that is, instances of < span class = "extract" > < span class = "extract-syntax" > K_action_name< / span > < / span > , do not have properties.
Instead, sentences which look as if they will assign properties are turned
into creations of action variables:
< / 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" > ActionVariables::actions_offered_property< / 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" > ActionVariables::actions_offered_property< / span > < / span > :< br / > Actions Plugin - < a href = "4-ap.html#SP1" > § 1< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > kind< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > K< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > parse_node< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > owner< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > parse_node< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > prop< / 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::eq< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > K< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > K_action_name< / span > < span class = "plain-syntax" > )) {< / span >
2021-03-13 15:00:21 +02:00
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > action_name< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > an< / span > < span class = "plain-syntax" > = < / span > < a href = "4-ak.html#SP4" class = "function-link" > < span class = "function-syntax" > ARvalues::to_action_name< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > owner< / span > < span class = "plain-syntax" > );< / span >
2021-02-27 18:52:18 +02:00
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > an< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "failed to extract action-name structure"< / 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" > global_pass_state< / span > < span class = "plain-syntax" > .< / span > < span class = "identifier-syntax" > pass< / span > < span class = "plain-syntax" > == < / span > < span class = "constant-syntax" > 1< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "named-paragraph-container code-font" > < a href = "4-av.html#SP1_1" class = "named-paragraph-link" > < span class = "named-paragraph" > Require the variable to have an explicit name< / span > < span class = "named-paragraph-number" > 1.1< / span > < / a > < / 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" > K< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "named-paragraph-container code-font" > < a href = "4-av.html#SP1_2" class = "named-paragraph-link" > < span class = "named-paragraph" > Determine and vet the kind of the new variable< / span > < span class = "named-paragraph-number" > 1.2< / span > < / a > < / 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" > NW< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > Node::get_text< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > prop< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > down< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > next< / 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" > MW< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > EMPTY_WORDING< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "named-paragraph-container code-font" > < a href = "4-av.html#SP1_3" class = "named-paragraph-link" > < span class = "named-paragraph" > Find the name and match wordings< / span > < span class = "named-paragraph-number" > 1.3< / span > < / a > < / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "named-paragraph-container code-font" > < a href = "4-av.html#SP1_4" class = "named-paragraph-link" > < span class = "named-paragraph" > Reject multi-word match wordings< / span > < span class = "named-paragraph-number" > 1.4< / span > < / a > < / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < a href = "4-av.html#SP4" class = "function-link" > < span class = "function-syntax" > ActionVariables::new< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > an< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > K< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > NW< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > MW< / 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" > 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 >
< / pre >
< p class = "commentary firstcommentary" > < a id = "SP1_1" class = "paragraph-anchor" > < / a > < b > § 1.1. < / b > Properties can be nameless, or rather, have the name only of their kind;
but action variables cannot.
< / p >
< p class = "commentary" > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Require the variable to have an explicit name< / span > < span class = "named-paragraph-number" > 1.1< / span > < / span > < span class = "comment-syntax" > =< / span >
< / p >
< pre class = "displayed-code all-displayed-code code-font" >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Node::get_type< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > prop< / span > < span class = "plain-syntax" > ) != < / span > < span class = "identifier-syntax" > PROPERTYCALLED_NT< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Problems::quote_source< / span > < span class = "plain-syntax" > (1, < / span > < span class = "identifier-syntax" > current_sentence< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > StandardProblems::handmade_problem< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Task::syntax_tree< / span > < span class = "plain-syntax" > (),< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > _p_< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > PM_ActionVarUncalled< / span > < span class = "plain-syntax" > ));< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Problems::issue_problem_segment< / span > < span class = "plain-syntax" > (< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "You wrote %1, which I am reading as a request to make a new named "< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "variable for an action - a value associated with a action and which "< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "has a name. But since you only give a kind, not a name, I'm stuck. "< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "('The taking action has a number called tenacity' is right, 'The "< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "taking action has a number' is too vague.)"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Problems::issue_problem_end< / 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 >
< / pre >
< ul class = "endnotetexts" > < li > This code is used in < a href = "4-av.html#SP1" > § 1< / a > .< / li > < / ul >
< p class = "commentary firstcommentary" > < a id = "SP1_2" class = "paragraph-anchor" > < / a > < b > § 1.2. < / b > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Determine and vet the kind of the new variable< / span > < span class = "named-paragraph-number" > 1.2< / span > < / span > < span class = "comment-syntax" > =< / span >
< / p >
< pre class = "displayed-code all-displayed-code code-font" >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > wording< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > KW< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > Node::get_text< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > prop< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > down< / 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" > < k-kind> < / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > KW< / span > < span class = "plain-syntax" > )) < / span > < span class = "identifier-syntax" > K< / span > < span class = "plain-syntax" > = < / span > < span class = "function-syntax" > < < rp> > < / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > else< / span > < span class = "plain-syntax" > {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > parse_node< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > spec< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > NULL< / 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" > < s-type-expression> < / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > KW< / span > < span class = "plain-syntax" > )) < / span > < span class = "identifier-syntax" > spec< / span > < span class = "plain-syntax" > = < / span > < span class = "function-syntax" > < < rp> > < / 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" > Specifications::is_description< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > spec< / span > < span class = "plain-syntax" > )) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Problems::quote_source< / span > < span class = "plain-syntax" > (1, < / span > < span class = "identifier-syntax" > current_sentence< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Problems::quote_wording< / span > < span class = "plain-syntax" > (2, < / span > < span class = "identifier-syntax" > KW< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > StandardProblems::handmade_problem< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Task::syntax_tree< / span > < span class = "plain-syntax" > (),< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > _p_< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > PM_ActionVarOverspecific< / span > < span class = "plain-syntax" > ));< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Problems::issue_problem_segment< / span > < span class = "plain-syntax" > (< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "You wrote %1, which I am reading as a request to make a new named "< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "variable for an action - a value associated with a action and which "< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "has a name. The request seems to say that the value in question is "< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "'%2', but this is too specific a description. (Instead, a kind of "< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "value (such as 'number') or a kind of object (such as 'room' or "< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "'thing') should be given. To get a property whose contents can be "< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "any kind of object, use 'object'.)"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Problems::issue_problem_end< / span > < span class = "plain-syntax" > ();< / span >
< span class = "plain-syntax" > } < / span > < span class = "reserved-syntax" > else< / 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" > "Offending SP: $T"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > spec< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Problems::quote_source< / span > < span class = "plain-syntax" > (1, < / span > < span class = "identifier-syntax" > current_sentence< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Problems::quote_wording< / span > < span class = "plain-syntax" > (2, < / span > < span class = "identifier-syntax" > KW< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > StandardProblems::handmade_problem< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Task::syntax_tree< / span > < span class = "plain-syntax" > (),< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > _p_< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > PM_ActionVarUnknownKOV< / span > < span class = "plain-syntax" > ));< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Problems::issue_problem_segment< / span > < span class = "plain-syntax" > (< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "You wrote %1, but '%2' is not the name of a kind of value which "< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "I know (such as 'number' or 'text')."< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Problems::issue_problem_end< / 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" > 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" > Kinds::Behaviour::definite< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > K< / 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" > Problems::quote_source< / span > < span class = "plain-syntax" > (1, < / span > < span class = "identifier-syntax" > current_sentence< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Problems::quote_wording< / span > < span class = "plain-syntax" > (2, < / span > < span class = "identifier-syntax" > KW< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > StandardProblems::handmade_problem< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Task::syntax_tree< / span > < span class = "plain-syntax" > (),< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > _p_< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > PM_ActionVarValue< / span > < span class = "plain-syntax" > ));< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Problems::issue_problem_segment< / span > < span class = "plain-syntax" > (< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "You wrote %1, but saying that a variable is a 'value' does not give me "< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "a clear enough idea what it will hold. You need to say what kind of "< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "value: for instance, 'A door has a number called street address.' is "< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "allowed because 'number' is specific about the kind of value."< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Problems::issue_problem_end< / 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 >
< / pre >
< ul class = "endnotetexts" > < li > This code is used in < a href = "4-av.html#SP1" > § 1< / a > .< / li > < / ul >
< p class = "commentary firstcommentary" > < a id = "SP2" class = "paragraph-anchor" > < / a > < b > § 2. < / b > Variable names need to be sensible, but can have bracketed match clauses:
< / p >
< pre class = "Preform-displayed-code all-displayed-code code-font" >
< span class = "Preform-function-syntax" > < action-variable> < / span > < span class = "Preform-plain-syntax" > < / span > < span class = "Preform-reserved-syntax" > ::=< / span >
< span class = "Preform-plain-syntax" > < / span > < span class = "Preform-function-syntax" > < action-variable-name> < / span > < span class = "Preform-plain-syntax" > < / span > < span class = "Preform-reserved-syntax" > (< / span > < span class = "Preform-plain-syntax" > < / span > < span class = "Preform-constant-syntax" > matched< / span > < span class = "Preform-plain-syntax" > < / span > < span class = "Preform-constant-syntax" > as< / span > < span class = "Preform-plain-syntax" > < / span > < span class = "Preform-constant-syntax" > {< quoted-text-without-subs> }< / span > < span class = "Preform-plain-syntax" > < / span > < span class = "Preform-reserved-syntax" > )< / span > < span class = "Preform-plain-syntax" > < / span > < span class = "Preform-reserved-syntax" > |< / span > < span class = "Preform-plain-syntax" > < / span > < span class = "Preform-reserved-syntax" > ==> < / span > < span class = "Preform-plain-syntax" > { TRUE, - }< / span >
< span class = "Preform-plain-syntax" > < / span > < span class = "Preform-function-syntax" > < action-variable-name> < / span > < span class = "Preform-plain-syntax" > < / span > < span class = "Preform-reserved-syntax" > (< / span > < span class = "Preform-plain-syntax" > < / span > < span class = "Preform-reserved-syntax" > ...< / span > < span class = "Preform-plain-syntax" > < / span > < span class = "Preform-reserved-syntax" > )< / span > < span class = "Preform-plain-syntax" > < / span > < span class = "Preform-reserved-syntax" > |< / span > < span class = "Preform-plain-syntax" > < / span > < span class = "Preform-reserved-syntax" > ==> < / span > < span class = "Preform-plain-syntax" > < / span > < span class = "named-paragraph-container code-font" > < a href = "4-av.html#SP2_1" class = "named-paragraph-link" > < span class = "named-paragraph" > Issue PM_BadMatchingSyntax problem< / span > < span class = "named-paragraph-number" > 2.1< / span > < / a > < / span >
< span class = "Preform-plain-syntax" > < / span > < span class = "Preform-function-syntax" > < action-variable-name> < / span > < span class = "Preform-plain-syntax" > < / span > < span class = "Preform-reserved-syntax" > ==> < / span > < span class = "Preform-plain-syntax" > { FALSE, - }< / span >
< span class = "Preform-function-syntax" > < action-variable-name> < / span > < span class = "Preform-plain-syntax" > < / span > < span class = "Preform-reserved-syntax" > ::=< / span >
< span class = "Preform-plain-syntax" > < / span > < span class = "Preform-function-syntax" > < unfortunate-name> < / span > < span class = "Preform-plain-syntax" > < / span > < span class = "Preform-reserved-syntax" > |< / span > < span class = "Preform-plain-syntax" > < / span > < span class = "Preform-reserved-syntax" > ==> < / span > < span class = "Preform-plain-syntax" > < / span > < span class = "named-paragraph-container code-font" > < a href = "4-av.html#SP2_2" class = "named-paragraph-link" > < span class = "named-paragraph" > Issue PM_ActionVarAnd problem< / span > < span class = "named-paragraph-number" > 2.2< / span > < / a > < / span >
< span class = "Preform-plain-syntax" > < / span > < span class = "Preform-reserved-syntax" > ...< / span > < span class = "Preform-plain-syntax" > < / span > < span class = "Preform-reserved-syntax" > ==> < / span > < span class = "Preform-plain-syntax" > { TRUE, - }< / 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 = "SP2_1" class = "paragraph-anchor" > < / a > < b > § 2.1. < / b > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Issue PM_BadMatchingSyntax problem< / span > < span class = "named-paragraph-number" > 2.1< / span > < / span > < span class = "Preform-comment-syntax" > =< / span >
< / p >
< pre class = "displayed-code all-displayed-code code-font" >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Problems::quote_source< / span > < span class = "plain-syntax" > (1, < / span > < span class = "identifier-syntax" > current_sentence< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Problems::quote_wording< / span > < span class = "plain-syntax" > (2, < / span > < span class = "identifier-syntax" > W< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > StandardProblems::handmade_problem< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Task::syntax_tree< / span > < span class = "plain-syntax" > (),< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > _p_< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > PM_BadMatchingSyntax< / span > < span class = "plain-syntax" > ));< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Problems::issue_problem_segment< / span > < span class = "plain-syntax" > (< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "You wrote %1, which I am reading as a request to make "< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "a new named variable for an action - a value associated "< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "with a action and which has a name. The request seems to "< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "say in parentheses that the name in question is '%2', but "< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "I only recognise the form '(matched as \"some text\")' here."< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Problems::issue_problem_end< / span > < span class = "plain-syntax" > ();< / span >
< span class = "plain-syntax" > ==> { < / span > < span class = "identifier-syntax" > NOT_APPLICABLE< / span > < span class = "plain-syntax" > , - };< / span >
< / pre >
< ul class = "endnotetexts" > < li > This code is used in < a href = "4-av.html#SP2" > § 2< / a > .< / li > < / ul >
< p class = "commentary firstcommentary" > < a id = "SP2_2" class = "paragraph-anchor" > < / a > < b > § 2.2. < / b > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Issue PM_ActionVarAnd problem< / span > < span class = "named-paragraph-number" > 2.2< / span > < / span > < span class = "comment-syntax" > =< / span >
< / p >
< pre class = "displayed-code all-displayed-code code-font" >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Problems::quote_source< / span > < span class = "plain-syntax" > (1, < / span > < span class = "identifier-syntax" > current_sentence< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Problems::quote_wording< / span > < span class = "plain-syntax" > (2, < / span > < span class = "identifier-syntax" > W< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > StandardProblems::handmade_problem< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Task::syntax_tree< / span > < span class = "plain-syntax" > (),< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > _p_< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > PM_ActionVarAnd< / span > < span class = "plain-syntax" > ));< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Problems::issue_problem_segment< / span > < span class = "plain-syntax" > (< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "You wrote %1, which I am reading as a request to make "< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "a new named variable for an action - a value associated "< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "with a action and which has a name. The request seems to "< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "say that the name in question is '%2', but I'd prefer to "< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "avoid 'and', 'or', 'with', or 'having' in such names, please."< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Problems::issue_problem_end< / span > < span class = "plain-syntax" > ();< / span >
< span class = "plain-syntax" > ==> { < / span > < span class = "identifier-syntax" > NOT_APPLICABLE< / span > < span class = "plain-syntax" > , - };< / span >
< / pre >
< ul class = "endnotetexts" > < li > This code is used in < a href = "4-av.html#SP2" > § 2< / a > .< / li > < / ul >
< p class = "commentary firstcommentary" > < a id = "SP1_3" class = "paragraph-anchor" > < / a > < b > § 1.3. < / b > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Find the name and match wordings< / span > < span class = "named-paragraph-number" > 1.3< / span > < / span > < span class = "comment-syntax" > =< / span >
< / p >
< pre class = "displayed-code all-displayed-code code-font" >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "function-syntax" > < action-variable> < / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > NW< / 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" > < < r> > < / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > NOT_APPLICABLE< / 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 = "identifier-syntax" > NW< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > GET_RW< / span > < span class = "plain-syntax" > (< / span > < span class = "function-syntax" > < action-variable-name> < / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > 1< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "function-syntax" > < < r> > < / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > MW< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > GET_RW< / span > < span class = "plain-syntax" > (< / span > < span class = "function-syntax" > < action-variable> < / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > 1< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > wn< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > Wordings::first_wn< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > MW< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Word::dequote< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > wn< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > MW< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > Feeds::feed_C_string< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Lexer::word_text< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > wn< / span > < span class = "plain-syntax" > ));< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > }< / span >
< / pre >
< ul class = "endnotetexts" > < li > This code is used in < a href = "4-av.html#SP1" > § 1< / a > .< / li > < / ul >
< p class = "commentary firstcommentary" > < a id = "SP1_4" class = "paragraph-anchor" > < / a > < b > § 1.4. < / b > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Reject multi-word match wordings< / span > < span class = "named-paragraph-number" > 1.4< / span > < / span > < span class = "comment-syntax" > =< / span >
< / p >
< pre class = "displayed-code all-displayed-code code-font" >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Wordings::length< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > MW< / 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" > Problems::quote_source< / span > < span class = "plain-syntax" > (1, < / span > < span class = "identifier-syntax" > current_sentence< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Problems::quote_wording< / span > < span class = "plain-syntax" > (2, < / span > < span class = "identifier-syntax" > MW< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > StandardProblems::handmade_problem< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Task::syntax_tree< / span > < span class = "plain-syntax" > (),< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > _p_< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > PM_MatchedAsTooLong< / span > < span class = "plain-syntax" > ));< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Problems::issue_problem_segment< / span > < span class = "plain-syntax" > (< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "You wrote %1, which I am reading as a request to make "< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "a new named variable for an action - a value associated "< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "with a action and which has a name. You say that it should "< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "be '(matched as \"%2\")', but I can only recognise such "< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "matches when a single keyword is used to introduce the "< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "clause, and this is more than one word."< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Problems::issue_problem_end< / 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 >
< / pre >
< ul class = "endnotetexts" > < li > This code is used in < a href = "4-av.html#SP1" > § 1< / a > .< / li > < / ul >
< p class = "commentary firstcommentary" > < a id = "SP3" class = "paragraph-anchor" > < / a > < b > § 3. < / b > An owner list is maintained for all sets of actions which actually have
variables (hence "nonempty") — many will not, in practice:
< / p >
< pre class = "displayed-code all-displayed-code code-font" >
< span class = "identifier-syntax" > stacked_variable_owner_list< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > all_nonempty_stacked_action_vars< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ;< / span >
< / pre >
< p class = "commentary firstcommentary" > < a id = "SP4" class = "paragraph-anchor" > < / a > < b > § 4. < / b > < / p >
< pre class = "displayed-code all-displayed-code code-font" >
< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > ActionVariables::new< / span > < button class = "popup" onclick = "togglePopup('usagePopup2')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup2" > Usage of < span class = "code-font" > < span class = "function-syntax" > ActionVariables::new< / span > < / span > :< br / > < a href = "4-av.html#SP1" > § 1< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > action_name< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > an< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > kind< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > K< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > wording< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > NW< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > wording< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > MW< / 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" > StackedVariables::owner_empty< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > an< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > action_variables< / span > < span class = "plain-syntax" > ))< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > all_nonempty_stacked_action_vars< / span > < span class = "plain-syntax" > =< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > StackedVariables::add_owner_to_list< / span > < span class = "plain-syntax" > (< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > all_nonempty_stacked_action_vars< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > an< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > action_variables< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > stacked_variable< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > stv< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > StackedVariables::add_empty< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > an< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > action_variables< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > NW< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > K< / 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" > Wordings::nonempty< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > MW< / span > < span class = "plain-syntax" > ))< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > StackedVariables::set_matching_text< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > stv< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > MW< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > LOGIF< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > ACTION_CREATIONS< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > "Created action variable for $l: %W (%u)\n"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > an< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > NW< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > K< / 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" > Wordings::nonempty< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > MW< / span > < span class = "plain-syntax" > ))< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > LOGIF< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > ACTION_CREATIONS< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > "Match with text: %W + SP\n"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > MW< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > }< / span >
< / pre >
< p class = "commentary firstcommentary" > < a id = "SP5" class = "paragraph-anchor" > < / a > < b > § 5. < / b > Action variables can optionally be marked as able to extend the grammar of
action patterns. For example, the Standard Rules define:
< / p >
< blockquote >
< p > The exiting action has an object called the container exited from (matched as "from").< / p >
< / blockquote >
< p class = "commentary" > and this allows "exiting from the cage", say, as an action pattern.
< / p >
< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "identifier-syntax" > stacked_variable< / span > < span class = "plain-syntax" > *< / span > < span class = "function-syntax" > ActionVariables::parse_match_clause< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > action_name< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > an< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > wording< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > W< / 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" > StackedVariables::parse_match_clause< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > an< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > action_variables< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > W< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > }< / span >
< / pre >
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