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JavaScript

"use strict";
const GrammarError = require( "./grammar-error" );
const compiler = require( "./compiler" );
const parser = require( "./parser" );
const peg = {
// PEG.js version (uses semantic versioning).
VERSION: "0.10.0",
GrammarError: GrammarError,
parser: parser,
compiler: compiler,
// Generates a parser from a specified grammar and returns it.
//
// The grammar must be a string in the format described by the metagramar in
// the parser.pegjs file.
//
// Throws |peg.parser.SyntaxError| if the grammar contains a syntax error or
// |peg.GrammarError| if it 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.
generate( grammar, options ) {
options = typeof options !== "undefined" ? options : {};
function convertPasses( passes ) {
const converted = {};
Object.keys( passes ).forEach( stage => {
converted[ stage ] = Object.keys( passes[ stage ] )
.map( name => passes[ stage ][ name ] );
} );
return converted;
}
const plugins = "plugins" in options ? options.plugins : [];
const config = {
parser: peg.parser,
passes: convertPasses( peg.compiler.passes )
};
plugins.forEach( p => {
p.use( config, options );
} );
return peg.compiler.compile(
config.parser.parse( grammar ),
config.passes,
options
);
}
};
module.exports = peg;