65 lines
2.4 KiB
JavaScript
65 lines
2.4 KiB
JavaScript
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#!/usr/bin/env node
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/* eg. node bin/nearleythere.js examples/js/left.js --input "....."
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or, node bin/nearleythere.js examples/js/AycockHorspool.js --input "aa"
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*/
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var fs = require('fs');
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var nearley = require('../lib/nearley.js');
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var opts = require('commander');
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var StreamWrapper = require('../lib/stream.js');
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var version = require('../package.json').version;
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opts.version(version, '-v, --version')
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.arguments('<file.js>')
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.option('-i, --input [string]', 'An input string to parse (if not provided then read from stdin)')
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.option('-s, --start [symbol]', 'An optional start symbol (if not provided then use the parser start symbol)', false)
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.option('-o, --out [filename]', 'File to output to (defaults to stdout)', false)
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.option('-q, --quiet', 'Output parse results only (hide Earley table)', false)
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.parse(process.argv);
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var output = opts.out ? fs.createWriteStream(opts.out) : process.stdout;
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if (!opts.args[0]) {
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throw new Error('Please supply a grammer.js file path as a command-line argument');
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}
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var filename = require('path').resolve(opts.args[0]);
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var grammar = nearley.Grammar.fromCompiled(require(filename));
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if (opts.start) grammar.start = opts.start
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var parser = new nearley.Parser(grammar, {
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keepHistory: true,
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});
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var writeTable = function (writeStream, parser) {
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writeStream.write("Table length: " + parser.table.length + "\n");
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writeStream.write("Number of parses: " + parser.results.length + "\n");
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writeStream.write("Parse Charts");
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parser.table.forEach(function (column, index) {
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writeStream.write("\nChart: " + index++ + "\n");
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var stateNumber = 0;
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column.states.forEach(function (state, stateIndex) {
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writeStream.write(stateIndex + ": " + state.toString() + "\n");
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})
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})
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writeStream.write("\n\nParse results: \n");
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}
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var writeResults = function (writeStream, parser) {
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writeStream.write(require('util').inspect(parser.results, {colors: !opts.quiet, depth: null}));
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writeStream.write("\n");
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}
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if (typeof(opts.input) === "undefined") {
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process.stdin
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.pipe(new StreamWrapper(parser))
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.on('finish', function() {
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if (!opts.quiet) writeTable(output, parser);
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writeResults(output, parser);
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});
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} else {
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parser.feed(opts.input);
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if (!opts.quiet) writeTable(output, parser);
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writeResults(output, parser);
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}
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