84 lines
2.4 KiB
JavaScript
84 lines
2.4 KiB
JavaScript
"use strict";
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function processOptions(options, defaults) {
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let processedOptions = {};
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Object.keys(options).forEach(name => {
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processedOptions[name] = options[name];
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});
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Object.keys(defaults).forEach(name => {
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if (!processedOptions.hasOwnProperty(name)) {
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processedOptions[name] = defaults[name];
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}
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});
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return processedOptions;
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}
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let compiler = {
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/*
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* AST node visitor builder. Useful mainly for plugins which manipulate the
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* AST.
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*/
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visitor: require("./visitor"),
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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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reportUndefinedRules: require("./passes/report-undefined-rules"),
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reportDuplicateRules: require("./passes/report-duplicate-rules"),
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reportDuplicateLabels: require("./passes/report-duplicate-labels"),
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reportInfiniteRecursion: require("./passes/report-infinite-recursion"),
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reportInfiniteRepetition: require("./passes/report-infinite-repetition")
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},
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transform: {
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removeProxyRules: require("./passes/remove-proxy-rules")
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},
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generate: {
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generateBytecode: require("./passes/generate-bytecode"),
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generateJS: require("./passes/generate-js")
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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, options) {
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options = options !== undefined ? options : {};
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options = processOptions(options, {
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allowedStartRules: [ast.rules[0].name],
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cache: false,
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dependencies: {},
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exportVar: null,
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format: "bare",
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optimize: "speed",
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output: "parser",
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trace: false
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});
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for (let stage in passes) {
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if (passes.hasOwnProperty(stage)) {
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passes[stage].forEach(p => { p(ast, options); });
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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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module.exports = compiler;
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