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109 lines
3.3 KiB
JavaScript

"use strict";
const calcReportFailures = require( "./passes/calc-report-failures" );
const generateBytecode = require( "./passes/generate-bytecode" );
const generateJS = require( "./passes/generate-js" );
const removeProxyRules = require( "./passes/remove-proxy-rules" );
const reportDuplicateLabels = require( "./passes/report-duplicate-labels" );
const reportDuplicateRules = require( "./passes/report-duplicate-rules" );
const reportUnusedRules = require( "./passes/report-unused-rules" );
const reportInfiniteRecursion = require( "./passes/report-infinite-recursion" );
const reportInfiniteRepetition = require( "./passes/report-infinite-repetition" );
const reportUndefinedRules = require( "./passes/report-undefined-rules" );
const inferenceMatchResult = require( "./passes/inference-match-result" );
const Session = require( "./session" );
const util = require( "../util" );
const vm = require( "./vm" );
function processOptions( options, defaults ) {
const processedOptions = {};
util.extend( processedOptions, options );
util.extend( processedOptions, defaults );
return processedOptions;
}
const compiler = {
Session: Session,
vm: vm,
// 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: reportUndefinedRules,
reportDuplicateRules: reportDuplicateRules,
reportUnusedRules: reportUnusedRules,
reportDuplicateLabels: reportDuplicateLabels,
reportInfiniteRecursion: reportInfiniteRecursion,
reportInfiniteRepetition: reportInfiniteRepetition
},
transform: {
removeProxyRules: removeProxyRules
},
generate: {
calcReportFailures: calcReportFailures,
inferenceMatchResult: inferenceMatchResult,
generateBytecode: generateBytecode,
generateJS: generateJS
}
},
// 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( ast, session, options ) {
options = typeof options !== "undefined" ? options : {};
options = processOptions( options, {
allowedStartRules: [ ast.rules[ 0 ].name ],
cache: false,
context: {},
dependencies: {},
exportVar: null,
features: null,
format: "bare",
header: null,
optimize: "speed",
output: "parser",
trace: false
} );
util.each( session.passes, stage => {
stage.forEach( pass => {
pass( ast, session, options );
} );
} );
switch ( options.output ) {
case "parser":
return session.vm.runInContext( ast.code, options.context );
case "source":
return ast.code;
default:
session.error( `Invalid output format: ${ options.output }.` );
}
}
};
module.exports = compiler;