82 lines
2.2 KiB
Plaintext
82 lines
2.2 KiB
Plaintext
%lex
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%%
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\s+ /* skip whitespace */
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\-?[0-9]+("."[0-9]+)?\b return 'NUMBER';
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\"(.*?)\" return 'STRING';
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\'(.*?)\' return 'STRING';
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true return 'TRUE';
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false return 'FALSE';
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null return 'NULL';
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"in" return 'IN';
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"and" return 'AND';
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"or" return 'OR';
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"not" return 'NOT';
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(\w*?\:)?[\w\.\-]+\?? return 'MODELPATH';
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"==" return 'EQUALS';
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"!=" return 'NOT_EQUALS';
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"(" return 'LPAREN';
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")" return 'RPAREN';
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<<EOF>> return 'EOF';
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/lex
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/* operator associations and precedence */
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%left 'OR'
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%left 'AND'
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%left 'EQUALS' 'NOT_EQUALS'
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%left 'IN' 'NOT'
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%start expressions
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%% /* language grammar */
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expressions
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: e EOF
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{return $1;}
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;
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e
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: e EQUALS e
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{$$ = new yy.SubexpressionWrapper(function() {
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return $1.getValue() === $3.getValue();
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})}
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| e NOT_EQUALS e
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{$$ = new yy.SubexpressionWrapper(function() {
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return $1.getValue() !== $3.getValue();
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})}
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| LPAREN e RPAREN
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{$$ = new yy.SubexpressionWrapper(function() {
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return $2.getValue();
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})}
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| e AND e
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{$$ = new yy.SubexpressionWrapper(function() {
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return $1.getValue() && $3.getValue();
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})}
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| e OR e
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{$$ = new yy.SubexpressionWrapper(function() {
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return $1.getValue() || $3.getValue();
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})}
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| NOT e
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{$$ = new yy.SubexpressionWrapper(function() {
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return !($2.getValue());
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})}
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| e IN e
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{$$ = new yy.SubexpressionWrapper(function() {
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return $3.getValue().indexOf($1.getValue()) != -1;
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})}
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| NUMBER
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{$$ = new yy.ScalarWrapper(Number(yytext))}
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| STRING
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{$$ = new yy.ScalarWrapper(yytext.slice(1, -1))}
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| TRUE
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{$$ = new yy.ScalarWrapper(true)}
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| FALSE
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{$$ = new yy.ScalarWrapper(false)}
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| NULL
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{$$ = new yy.ScalarWrapper(null)}
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| MODELPATH
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{$$ = new yy.ModelPathWrapper(yytext)}
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;
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