1  #!/usr/bin/env node
  2  /*
  3    Copyright JS Foundation and other contributors, https://js.foundation/
  4  
  5    Redistribution and use in source and binary forms, with or without
  6    modification, are permitted provided that the following conditions are met:
  7  
  8      * Redistributions of source code must retain the above copyright
  9        notice, this list of conditions and the following disclaimer.
 10      * Redistributions in binary form must reproduce the above copyright
 11        notice, this list of conditions and the following disclaimer in the
 12        documentation and/or other materials provided with the distribution.
 13  
 14    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 15    AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 16    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 17    ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
 18    DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 19    (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 20    LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 21    ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 22    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 23    THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 24  */
 25  
 26  /*jslint sloppy:true node:true rhino:true */
 27  
 28  var fs, esprima, fname, forceFile, content, options, syntax;
 29  
 30  if (typeof require === 'function') {
 31      fs = require('fs');
 32      try {
 33          esprima = require('esprima');
 34      } catch (e) {
 35          esprima = require('../');
 36      }
 37  } else if (typeof load === 'function') {
 38      try {
 39          load('esprima.js');
 40      } catch (e) {
 41          load('../esprima.js');
 42      }
 43  }
 44  
 45  // Shims to Node.js objects when running under Rhino.
 46  if (typeof console === 'undefined' && typeof process === 'undefined') {
 47      console = { log: print };
 48      fs = { readFileSync: readFile };
 49      process = { argv: arguments, exit: quit };
 50      process.argv.unshift('esparse.js');
 51      process.argv.unshift('rhino');
 52  }
 53  
 54  function showUsage() {
 55      console.log('Usage:');
 56      console.log('   esparse [options] [file.js]');
 57      console.log();
 58      console.log('Available options:');
 59      console.log();
 60      console.log('  --comment      Gather all line and block comments in an array');
 61      console.log('  --loc          Include line-column location info for each syntax node');
 62      console.log('  --range        Include index-based range for each syntax node');
 63      console.log('  --raw          Display the raw value of literals');
 64      console.log('  --tokens       List all tokens in an array');
 65      console.log('  --tolerant     Tolerate errors on a best-effort basis (experimental)');
 66      console.log('  -v, --version  Shows program version');
 67      console.log();
 68      process.exit(1);
 69  }
 70  
 71  options = {};
 72  
 73  process.argv.splice(2).forEach(function (entry) {
 74  
 75      if (forceFile || entry === '-' || entry.slice(0, 1) !== '-') {
 76          if (typeof fname === 'string') {
 77              console.log('Error: more than one input file.');
 78              process.exit(1);
 79          } else {
 80              fname = entry;
 81          }
 82      } else if (entry === '-h' || entry === '--help') {
 83          showUsage();
 84      } else if (entry === '-v' || entry === '--version') {
 85          console.log('ECMAScript Parser (using Esprima version', esprima.version, ')');
 86          console.log();
 87          process.exit(0);
 88      } else if (entry === '--comment') {
 89          options.comment = true;
 90      } else if (entry === '--loc') {
 91          options.loc = true;
 92      } else if (entry === '--range') {
 93          options.range = true;
 94      } else if (entry === '--raw') {
 95          options.raw = true;
 96      } else if (entry === '--tokens') {
 97          options.tokens = true;
 98      } else if (entry === '--tolerant') {
 99          options.tolerant = true;
100      } else if (entry === '--') {
101          forceFile = true;
102      } else {
103          console.log('Error: unknown option ' + entry + '.');
104          process.exit(1);
105      }
106  });
107  
108  // Special handling for regular expression literal since we need to
109  // convert it to a string literal, otherwise it will be decoded
110  // as object "{}" and the regular expression would be lost.
111  function adjustRegexLiteral(key, value) {
112      if (key === 'value' && value instanceof RegExp) {
113          value = value.toString();
114      }
115      return value;
116  }
117  
118  function run(content) {
119      syntax = esprima.parse(content, options);
120      console.log(JSON.stringify(syntax, adjustRegexLiteral, 4));
121  }
122  
123  try {
124      if (fname && (fname !== '-' || forceFile)) {
125          run(fs.readFileSync(fname, 'utf-8'));
126      } else {
127          var content = '';
128          process.stdin.resume();
129          process.stdin.on('data', function(chunk) {
130              content += chunk;
131          });
132          process.stdin.on('end', function() {
133              run(content);
134          });
135      }
136  } catch (e) {
137      console.log('Error: ' + e.message);
138      process.exit(1);
139  }