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62 lines
1.7 KiB
JavaScript
62 lines
1.7 KiB
JavaScript
var utils = require("./utils");
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module.exports = {
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/*
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* Compiler passes.
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*
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* Each pass is a function that is passed the AST. It can perform checks on it
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* or modify it as needed. If the pass encounters a semantic error, it throws
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* |PEG.GrammarError|.
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*/
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passes: {
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check: {
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reportMissingRules: require("./compiler/passes/report-missing-rules"),
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reportLeftRecursion: require("./compiler/passes/report-left-recursion")
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},
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transform: {
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removeProxyRules: require("./compiler/passes/remove-proxy-rules")
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},
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generate: {
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generateBytecode: require("./compiler/passes/generate-bytecode"),
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generateJavascript: require("./compiler/passes/generate-javascript")
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}
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},
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/*
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* Generates a parser from a specified grammar AST. Throws |PEG.GrammarError|
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* if the AST contains a semantic error. Note that not all errors are detected
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* during the generation and some may protrude to the generated parser and
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* cause its malfunction.
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*/
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compile: function(ast, passes) {
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var options = arguments.length > 2 ? utils.clone(arguments[2]) : {},
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stage;
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/*
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* Extracted into a function just to silence JSHint complaining about
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* creating functions in a loop.
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*/
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function runPass(pass) {
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pass(ast, options);
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}
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utils.defaults(options, {
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allowedStartRules: [ast.rules[0].name],
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cache: false,
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optimize: "speed",
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output: "parser"
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});
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for (stage in passes) {
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if (passes.hasOwnProperty(stage)) {
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utils.each(passes[stage], runPass);
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}
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}
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switch (options.output) {
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case "parser": return eval(ast.code);
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case "source": return ast.code;
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}
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}
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};
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