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"use strict";
var arrays = require("../utils/arrays"),
objects = require("../utils/objects");
var compiler = {
/*
* AST node visitor builder. Useful mainly for plugins which manipulate the
* AST.
*/
visitor: require("./visitor"),
/*
* Compiler passes.
*
* Each pass is a function that is passed the AST. It can perform checks on it
* or modify it as needed. If the pass encounters a semantic error, it throws
* |peg.GrammarError|.
*/
passes: {
check: {
reportUndefinedRules: require("./passes/report-undefined-rules"),
reportDuplicateRules: require("./passes/report-duplicate-rules"),
reportDuplicateLabels: require("./passes/report-duplicate-labels"),
reportInfiniteRecursion: require("./passes/report-infinite-recursion"),
reportInfiniteRepetition: require("./passes/report-infinite-repetition")
},
transform: {
removeProxyRules: require("./passes/remove-proxy-rules")
},
generate: {
generateBytecode: require("./passes/generate-bytecode"),
generateJS: require("./passes/generate-js")
}
},
/*
* Generates a parser from a specified grammar AST. Throws |peg.GrammarError|
* if the AST contains a semantic error. Note that not all errors are detected
* during the generation and some may protrude to the generated parser and
* cause its malfunction.
*/
compile: function(ast, passes, options) {
options = options !== void 0 ? options : {};
var stage;
options = objects.clone(options);
objects.defaults(options, {
allowedStartRules: [ast.rules[0].name],
cache: false,
dependencies: {},
exportVar: null,
format: "bare",
optimize: "speed",
output: "parser",
trace: false
});
for (stage in passes) {
if (passes.hasOwnProperty(stage)) {
arrays.each(passes[stage], function(p) { p(ast, options); });
}
}
switch (options.output) {
case "parser": return eval(ast.code);
case "source": return ast.code;
}
}
};
module.exports = compiler;
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