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43 lines
841 B
JavaScript
43 lines
841 B
JavaScript
"use strict";
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// Removes proxy rules -- that is, rules that only delegate to other rule.
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function removeProxyRules( ast, session, options ) {
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function isProxyRule( node ) {
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return node.type === "rule" && node.expression.type === "rule_ref";
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}
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const replaceRuleRefs = session.buildVisitor( {
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rule_ref( node, proxy, real ) {
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if ( node.name === proxy ) node.name = real;
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}
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} );
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const allowedStartRules = options.allowedStartRules;
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const rules = [];
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ast.rules.forEach( rule => {
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if ( isProxyRule( rule ) ) {
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replaceRuleRefs( ast, rule.name, rule.expression.name );
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if ( allowedStartRules.indexOf( rule.name ) < 0 ) return;
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}
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rules.push( rule );
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} );
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ast.rules = rules;
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}
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module.exports = removeProxyRules;
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