30 lines
1.2 KiB
JavaScript
Executable File
30 lines
1.2 KiB
JavaScript
Executable File
#!/usr/bin/env node
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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 randexp = require('randexp');
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var Unparse = require('../lib/unparse.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('-s, --start [name]', 'An optional start symbol (if not provided then use the parser start symbol)', false)
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.option('-n, --count [n]', 'The number of samples to generate (separated by \\n).', 1)
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.option('-d, --depth [n]', 'The depth bound of each sample. Defaults to -1, which means "unbounded".', -1)
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.option('-o, --out [filename]', 'File to output to (defaults to stdout)')
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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 grammar = new require(require('path').resolve(opts.args[0]));
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// the main loop
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for (var i=0; i<parseInt(opts.count); i++) {
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output.write(Unparse(grammar, opts.start ? opts.start : grammar.ParserStart, (opts.depth === -1) ? null : parseInt(opts.depth)));
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if (parseInt(opts.count) > 1) output.write("\n");
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}
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