122 lines
3.9 KiB
JavaScript
122 lines
3.9 KiB
JavaScript
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#!/usr/bin/env node
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try {
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var rr = require('railroad-diagrams');
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} catch(e) {
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// optional dependency not fullfilled
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console.log('Error: When you installed nearley, the dependency "railroad-diagrams" failed to install. Try running "npm install -g nearley" to re-install nearley. If that doesn\'t fix the problem, please file an issue on the nearley GitHub repository.')
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process.exit(1)
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}
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var fs = require('fs');
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var path = require('path');
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var opts = require('commander');
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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.ne>')
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.option('-o, --out [filename.svg]', 'File to output to (default stdout).', false)
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.parse(process.argv);
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var input = opts.args[0] ? fs.createReadStream(opts.args[0]) : process.stdin;
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var output = opts.out ? fs.createWriteStream(opts.out) : process.stdout;
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function railroad(grm) {
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var rules = {};
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grm.forEach(function(instr) {
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if (instr.rules) {
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if (!rules[instr.name]) {
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rules[instr.name] = [];
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}
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rules[instr.name] = rules[instr.name].concat(instr.rules);
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}
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});
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var style = fs.readFileSync(
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path.join(
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path.dirname(require.resolve('railroad-diagrams')),
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'railroad-diagrams.css'
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)
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);
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var diagrams = Object.keys(rules).map(function(r) {
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return [
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'<h1><code>' + r + '</code></h1>',
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'<div>',
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diagram(r).toString(),
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'</div>'
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].join('\n');
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});
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function diagram(name) {
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var selectedrules = rules[name];
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var outer = {subexpression: selectedrules};
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function renderTok(tok) {
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// ctx translated to correct position already
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if (tok.subexpression) {
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return new rr.Choice(0, tok.subexpression.map(renderTok));
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} else if (tok.ebnf) {
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switch (tok.modifier) {
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case ":+":
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return new rr.OneOrMore(renderTok(tok.ebnf));
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break;
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case ":*":
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return new rr.ZeroOrMore(renderTok(tok.ebnf));
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break;
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case ":?":
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return new rr.Optional(renderTok(tok.ebnf));
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break;
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}
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} else if (tok.literal) {
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return new rr.Terminal(JSON.stringify(tok.literal));
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} else if (tok.mixin) {
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return new rr.Comment("Pas implementé.");
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} else if (tok.macrocall) {
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return new rr.Comment("Pas implementé.");
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} else if (tok.tokens) {
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return new rr.Sequence(tok.tokens.map(renderTok));
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} else if (typeof(tok) === 'string') {
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return new rr.NonTerminal(tok);
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} else if (tok.constructor === RegExp) {
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return new rr.Terminal(tok.toString());
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} else if (tok.token) {
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return new rr.Terminal(tok.token);
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} else {
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return new rr.Comment("[Unimplemented]");
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}
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}
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return new rr.Diagram([renderTok(outer)]);
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}
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return [
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'<!DOCTYPE html>',
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'<html>',
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'<head>',
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'<meta charset="UTF-8">',
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'<style type="text/css">',
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style.toString(),
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'</style>',
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'</head>',
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'<body>',
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diagrams.join('\n'),
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'</body>',
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'</html>'
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].join('\n');
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}
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var nearley = require('../lib/nearley.js');
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var StreamWrapper = require('../lib/stream.js');
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var parserGrammar = nearley.Grammar.fromCompiled(require('../lib/nearley-language-bootstrapped.js'));
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var parser = new nearley.Parser(parserGrammar);
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input
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.pipe(new StreamWrapper(parser))
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.on('finish', function() {
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if (parser.results[0]) {
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output.write(railroad(parser.results[0]));
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} else {
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process.stderr.write('SyntaxError: unexpected EOF\n');
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}
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});
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