Add option: --

Had a few bugs in the initial patch request (#98) as well...

Also, fixed the help() command to print to stderr on nonzero exit statuses given.

bin/acorn

@@ -4,28 +4,42 @@ var path = require("path");
 var fs = require("fs");
 var acorn = require("../acorn.js");
 
-var infile, parsed, options = {}, silent = false, compact = false;
+var infile, infilecount = 0;
+var options = {}, silent = false, compact = false;
+var parsed;
 
 function help(status) {
-  console.log("usage: " + path.basename(process.argv[1]) + " infile [--ecma3|--ecma5] [--strictSemicolons]");
+  // we want to print to stderr, not stdout, on errors.
-  console.log("        [--locations] [--compact] [--silent] [--help]");
+  var print = (status == 0) ? console.out : console.err;
+  print("usage: " + path.basename(process.argv[1]) + " [--ecma3|--ecma5] [--strictSemicolons]");
+  print("        [--locations] [--compact] [--silent] [--help] [--] infile");
   process.exit(status);
 }
 
 for (var i = 2; i < process.argv.length; ++i) {
   var arg = process.argv[i];
-  if (arg == "--ecma3") options.ecmaVersion = 3;
+  if (arg[0] != "-") {
+    infile = arg;
+    ++infilecount;
+    continue;
+  } else if (arg == "--") {
+    if (i < process.argv.length - 2) help(1); // we have too many remaining `infile`s
+    infile = process.argv[i + 1]; // we want the *next* argument, not the current one
+    ++infilecount;
+    break;
+  }
+  else if (arg == "--ecma3") options.ecmaVersion = 3;
   else if (arg == "--ecma5") options.ecmaVersion = 5;
   else if (arg == "--strictSemicolons") options.strictSemicolons = true;
   else if (arg == "--locations") options.locations = true;
   else if (arg == "--silent") silent = true;
   else if (arg == "--compact") compact = true;
   else if (arg == "--help") help(0);
-  else if (arg[0] == "-") help(1);
+  else help(1); // we already took care of all arguments without a starting dash
-  else infile = arg;
 }
 
-if (!infile) help(1);
+// test against counter: we want exactly 1 file. Any more or less should error.
+if (infilecount !== 1) help(1);
 
 try {
   var code = fs.readFileSync(infile, "utf8");

index.html

@@ -188,7 +188,7 @@ we assign a variable name to it for quick comparing.</p>             </td>
                       <span class="s2">&quot;delete&quot;</span><span class="o">:</span> <span class="p">{</span><span class="nx">keyword</span><span class="o">:</span> <span class="s2">&quot;delete&quot;</span><span class="p">,</span> <span class="nx">prefix</span><span class="o">:</span> <span class="kc">true</span><span class="p">,</span> <span class="nx">beforeExpr</span><span class="o">:</span> <span class="kc">true</span><span class="p">}};</span></pre></div>             </td>           </tr>                               <tr id="section-36">             <td class="docs">               <div class="pilwrap">                 <a class="pilcrow" href="#section-36">&#182;</a>               </div>               <p>Punctuation token types. Again, the <code>type</code> property is purely for debugging.</p>             </td>             <td class="code">               <div class="highlight"><pre>  <span class="kd">var</span> <span class="nx">_bracketL</span> <span class="o">=</span> <span class="p">{</span><span class="nx">type</span><span class="o">:</span> <span class="s2">&quot;[&quot;</span><span class="p">,</span> <span class="nx">beforeExpr</span><span class="o">:</span> <span class="kc">true</span><span class="p">},</span> <span class="nx">_bracketR</span> <span class="o">=</span> <span class="p">{</span><span class="nx">type</span><span class="o">:</span> <span class="s2">&quot;]&quot;</span><span class="p">},</span> <span class="nx">_braceL</span> <span class="o">=</span> <span class="p">{</span><span class="nx">type</span><span class="o">:</span> <span class="s2">&quot;{&quot;</span><span class="p">,</span> <span class="nx">beforeExpr</span><span class="o">:</span> <span class="kc">true</span><span class="p">};</span>
   <span class="kd">var</span> <span class="nx">_braceR</span> <span class="o">=</span> <span class="p">{</span><span class="nx">type</span><span class="o">:</span> <span class="s2">&quot;}&quot;</span><span class="p">},</span> <span class="nx">_parenL</span> <span class="o">=</span> <span class="p">{</span><span class="nx">type</span><span class="o">:</span> <span class="s2">&quot;(&quot;</span><span class="p">,</span> <span class="nx">beforeExpr</span><span class="o">:</span> <span class="kc">true</span><span class="p">},</span> <span class="nx">_parenR</span> <span class="o">=</span> <span class="p">{</span><span class="nx">type</span><span class="o">:</span> <span class="s2">&quot;)&quot;</span><span class="p">};</span>
   <span class="kd">var</span> <span class="nx">_comma</span> <span class="o">=</span> <span class="p">{</span><span class="nx">type</span><span class="o">:</span> <span class="s2">&quot;,&quot;</span><span class="p">,</span> <span class="nx">beforeExpr</span><span class="o">:</span> <span class="kc">true</span><span class="p">},</span> <span class="nx">_semi</span> <span class="o">=</span> <span class="p">{</span><span class="nx">type</span><span class="o">:</span> <span class="s2">&quot;;&quot;</span><span class="p">,</span> <span class="nx">beforeExpr</span><span class="o">:</span> <span class="kc">true</span><span class="p">};</span>
-  <span class="kd">var</span> <span class="nx">_colon</span> <span class="o">=</span> <span class="p">{</span><span class="nx">type</span><span class="o">:</span> <span class="s2">&quot;:&quot;</span><span class="p">,</span> <span class="nx">beforeExpr</span><span class="o">:</span> <span class="kc">true</span><span class="p">},</span> <span class="nx">_dot</span> <span class="o">=</span> <span class="p">{</span><span class="nx">type</span><span class="o">:</span> <span class="s2">&quot;.&quot;</span><span class="p">},</span> <span class="nx">_question</span> <span class="o">=</span> <span class="p">{</span><span class="nx">type</span><span class="o">:</span> <span class="s2">&quot;?&quot;</span><span class="p">,</span> <span class="nx">beforeExpr</span><span class="o">:</span> <span class="kc">true</span><span class="p">};</span></pre></div>             </td>           </tr>                               <tr id="section-37">             <td class="docs">               <div class="pilwrap">                 <a class="pilcrow" href="#section-37">&#182;</a>               </div>               <p>Operators. These carry several kinds of properties to help the
+  <span class="kd">var</span> <span class="nx">_colon</span> <span class="o">=</span> <span class="p">{</span><span class="nx">type</span><span class="o">:</span> <span class="s2">&quot;:&quot;</span><span class="p">,</span> <span class="nx">beforeExpr</span><span class="o">:</span> <span class="kc">true</span><span class="p">},</span> <span class="nx">_dot</span> <span class="o">=</span> <span class="p">{</span><span class="nx">type</span><span class="o">:</span> <span class="s2">&quot;.&quot;</span><span class="p">},</span> <span class="nx">_ellipsis</span> <span class="o">=</span> <span class="p">{</span><span class="nx">type</span><span class="o">:</span> <span class="s2">&quot;...&quot;</span><span class="p">},</span> <span class="nx">_question</span> <span class="o">=</span> <span class="p">{</span><span class="nx">type</span><span class="o">:</span> <span class="s2">&quot;?&quot;</span><span class="p">,</span> <span class="nx">beforeExpr</span><span class="o">:</span> <span class="kc">true</span><span class="p">};</span></pre></div>             </td>           </tr>                               <tr id="section-37">             <td class="docs">               <div class="pilwrap">                 <a class="pilcrow" href="#section-37">&#182;</a>               </div>               <p>Operators. These carry several kinds of properties to help the
 parser use them properly (the presence of these properties is
 what categorizes them as operators).</p>
 
@@ -217,8 +217,8 @@ in AssignmentExpression nodes.</p>             </td>             <td class="code
   <span class="kd">var</span> <span class="nx">_multiplyModulo</span> <span class="o">=</span> <span class="p">{</span><span class="nx">binop</span><span class="o">:</span> <span class="mi">10</span><span class="p">,</span> <span class="nx">beforeExpr</span><span class="o">:</span> <span class="kc">true</span><span class="p">};</span></pre></div>             </td>           </tr>                               <tr id="section-38">             <td class="docs">               <div class="pilwrap">                 <a class="pilcrow" href="#section-38">&#182;</a>               </div>               <p>Provide access to the token types for external users of the
 tokenizer.</p>             </td>             <td class="code">               <div class="highlight"><pre>  <span class="nx">exports</span><span class="p">.</span><span class="nx">tokTypes</span> <span class="o">=</span> <span class="p">{</span><span class="nx">bracketL</span><span class="o">:</span> <span class="nx">_bracketL</span><span class="p">,</span> <span class="nx">bracketR</span><span class="o">:</span> <span class="nx">_bracketR</span><span class="p">,</span> <span class="nx">braceL</span><span class="o">:</span> <span class="nx">_braceL</span><span class="p">,</span> <span class="nx">braceR</span><span class="o">:</span> <span class="nx">_braceR</span><span class="p">,</span>
                       <span class="nx">parenL</span><span class="o">:</span> <span class="nx">_parenL</span><span class="p">,</span> <span class="nx">parenR</span><span class="o">:</span> <span class="nx">_parenR</span><span class="p">,</span> <span class="nx">comma</span><span class="o">:</span> <span class="nx">_comma</span><span class="p">,</span> <span class="nx">semi</span><span class="o">:</span> <span class="nx">_semi</span><span class="p">,</span> <span class="nx">colon</span><span class="o">:</span> <span class="nx">_colon</span><span class="p">,</span>
-                      <span class="nx">dot</span><span class="o">:</span> <span class="nx">_dot</span><span class="p">,</span> <span class="nx">question</span><span class="o">:</span> <span class="nx">_question</span><span class="p">,</span> <span class="nx">slash</span><span class="o">:</span> <span class="nx">_slash</span><span class="p">,</span> <span class="nx">eq</span><span class="o">:</span> <span class="nx">_eq</span><span class="p">,</span> <span class="nx">name</span><span class="o">:</span> <span class="nx">_name</span><span class="p">,</span> <span class="nx">eof</span><span class="o">:</span> <span class="nx">_eof</span><span class="p">,</span>
+                      <span class="nx">dot</span><span class="o">:</span> <span class="nx">_dot</span><span class="p">,</span> <span class="nx">ellipsis</span><span class="o">:</span> <span class="nx">_ellipsis</span><span class="p">,</span> <span class="nx">question</span><span class="o">:</span> <span class="nx">_question</span><span class="p">,</span> <span class="nx">slash</span><span class="o">:</span> <span class="nx">_slash</span><span class="p">,</span> <span class="nx">eq</span><span class="o">:</span> <span class="nx">_eq</span><span class="p">,</span>
-                      <span class="nx">num</span><span class="o">:</span> <span class="nx">_num</span><span class="p">,</span> <span class="nx">regexp</span><span class="o">:</span> <span class="nx">_regexp</span><span class="p">,</span> <span class="nx">string</span><span class="o">:</span> <span class="nx">_string</span><span class="p">};</span>
+                      <span class="nx">name</span><span class="o">:</span> <span class="nx">_name</span><span class="p">,</span> <span class="nx">eof</span><span class="o">:</span> <span class="nx">_eof</span><span class="p">,</span> <span class="nx">num</span><span class="o">:</span> <span class="nx">_num</span><span class="p">,</span> <span class="nx">regexp</span><span class="o">:</span> <span class="nx">_regexp</span><span class="p">,</span> <span class="nx">string</span><span class="o">:</span> <span class="nx">_string</span><span class="p">};</span>
   <span class="k">for</span> <span class="p">(</span><span class="kd">var</span> <span class="nx">kw</span> <span class="k">in</span> <span class="nx">keywordTypes</span><span class="p">)</span> <span class="nx">exports</span><span class="p">.</span><span class="nx">tokTypes</span><span class="p">[</span><span class="s2">&quot;_&quot;</span> <span class="o">+</span> <span class="nx">kw</span><span class="p">]</span> <span class="o">=</span> <span class="nx">keywordTypes</span><span class="p">[</span><span class="nx">kw</span><span class="p">];</span></pre></div>             </td>           </tr>                               <tr id="section-39">             <td class="docs">               <div class="pilwrap">                 <a class="pilcrow" href="#section-39">&#182;</a>               </div>               <p>This is a trick taken from Esprima. It turns out that, on
 non-Chrome browsers, to check whether a string is in a set, a
 predicate containing a big ugly <code>switch</code> statement is faster than
@@ -376,8 +376,14 @@ into it.</p>
 <code>tokRegexpAllowed</code> trick does not work. See <code>parseStatement</code>.</p>             </td>             <td class="code">               <div class="highlight"><pre>  <span class="kd">function</span> <span class="nx">readToken_dot</span><span class="p">()</span> <span class="p">{</span>
     <span class="kd">var</span> <span class="nx">next</span> <span class="o">=</span> <span class="nx">input</span><span class="p">.</span><span class="nx">charCodeAt</span><span class="p">(</span><span class="nx">tokPos</span> <span class="o">+</span> <span class="mi">1</span><span class="p">);</span>
     <span class="k">if</span> <span class="p">(</span><span class="nx">next</span> <span class="o">&gt;=</span> <span class="mi">48</span> <span class="o">&amp;&amp;</span> <span class="nx">next</span> <span class="o">&lt;=</span> <span class="mi">57</span><span class="p">)</span> <span class="k">return</span> <span class="nx">readNumber</span><span class="p">(</span><span class="kc">true</span><span class="p">);</span>
-    <span class="o">++</span><span class="nx">tokPos</span><span class="p">;</span>
+    <span class="kd">var</span> <span class="nx">next2</span> <span class="o">=</span> <span class="nx">input</span><span class="p">.</span><span class="nx">charCodeAt</span><span class="p">(</span><span class="nx">tokPos</span> <span class="o">+</span> <span class="mi">2</span><span class="p">);</span>
-    <span class="k">return</span> <span class="nx">finishToken</span><span class="p">(</span><span class="nx">_dot</span><span class="p">);</span>
+    <span class="k">if</span> <span class="p">(</span><span class="nx">options</span><span class="p">.</span><span class="nx">ecmaVersion</span> <span class="o">&gt;=</span> <span class="mi">6</span> <span class="o">&amp;&amp;</span> <span class="nx">next</span> <span class="o">===</span> <span class="mi">46</span> <span class="o">&amp;&amp;</span> <span class="nx">next2</span> <span class="o">===</span> <span class="mi">46</span><span class="p">)</span> <span class="p">{</span> <span class="c1">// 46 = dot &#39;.&#39;</span>
+      <span class="nx">tokPos</span> <span class="o">+=</span> <span class="mi">3</span><span class="p">;</span>
+      <span class="k">return</span> <span class="nx">finishToken</span><span class="p">(</span><span class="nx">_ellipsis</span><span class="p">);</span>
+    <span class="p">}</span> <span class="k">else</span> <span class="p">{</span>
+      <span class="o">++</span><span class="nx">tokPos</span><span class="p">;</span>
+      <span class="k">return</span> <span class="nx">finishToken</span><span class="p">(</span><span class="nx">_dot</span><span class="p">);</span>
+    <span class="p">}</span>
   <span class="p">}</span>
 
   <span class="kd">function</span> <span class="nx">readToken_slash</span><span class="p">()</span> <span class="p">{</span> <span class="c1">// &#39;/&#39;</span>
@@ -448,7 +454,7 @@ into it.</p>
 
   <span class="kd">function</span> <span class="nx">getTokenFromCode</span><span class="p">(</span><span class="nx">code</span><span class="p">)</span> <span class="p">{</span>
     <span class="k">switch</span><span class="p">(</span><span class="nx">code</span><span class="p">)</span> <span class="p">{</span></pre></div>             </td>           </tr>                               <tr id="section-62">             <td class="docs">               <div class="pilwrap">                 <a class="pilcrow" href="#section-62">&#182;</a>               </div>               <p>The interpretation of a dot depends on whether it is followed
-by a digit.</p>             </td>             <td class="code">               <div class="highlight"><pre>    <span class="k">case</span> <span class="mi">46</span><span class="o">:</span> <span class="c1">// &#39;.&#39;</span>
+by a digit or another two dots.</p>             </td>             <td class="code">               <div class="highlight"><pre>    <span class="k">case</span> <span class="mi">46</span><span class="o">:</span> <span class="c1">// &#39;.&#39;</span>
       <span class="k">return</span> <span class="nx">readToken_dot</span><span class="p">();</span></pre></div>             </td>           </tr>                               <tr id="section-63">             <td class="docs">               <div class="pilwrap">                 <a class="pilcrow" href="#section-63">&#182;</a>               </div>               <p>Punctuation tokens.</p>             </td>             <td class="code">               <div class="highlight"><pre>    <span class="k">case</span> <span class="mi">40</span><span class="o">:</span> <span class="o">++</span><span class="nx">tokPos</span><span class="p">;</span> <span class="k">return</span> <span class="nx">finishToken</span><span class="p">(</span><span class="nx">_parenL</span><span class="p">);</span>
     <span class="k">case</span> <span class="mi">41</span><span class="o">:</span> <span class="o">++</span><span class="nx">tokPos</span><span class="p">;</span> <span class="k">return</span> <span class="nx">finishToken</span><span class="p">(</span><span class="nx">_parenR</span><span class="p">);</span>
     <span class="k">case</span> <span class="mi">59</span><span class="o">:</span> <span class="o">++</span><span class="nx">tokPos</span><span class="p">;</span> <span class="k">return</span> <span class="nx">finishToken</span><span class="p">(</span><span class="nx">_semi</span><span class="p">);</span>
@@ -1280,11 +1286,22 @@ init properties are also not allowed to be repeated.</p>             </td>
     <span class="k">else</span> <span class="k">if</span> <span class="p">(</span><span class="nx">isStatement</span><span class="p">)</span> <span class="nx">unexpected</span><span class="p">();</span>
     <span class="k">else</span> <span class="nx">node</span><span class="p">.</span><span class="nx">id</span> <span class="o">=</span> <span class="kc">null</span><span class="p">;</span>
     <span class="nx">node</span><span class="p">.</span><span class="nx">params</span> <span class="o">=</span> <span class="p">[];</span>
-    <span class="kd">var</span> <span class="nx">first</span> <span class="o">=</span> <span class="kc">true</span><span class="p">;</span>
+    <span class="nx">node</span><span class="p">.</span><span class="nx">rest</span> <span class="o">=</span> <span class="kc">null</span><span class="p">;</span>
     <span class="nx">expect</span><span class="p">(</span><span class="nx">_parenL</span><span class="p">);</span>
-    <span class="k">while</span> <span class="p">(</span><span class="o">!</span><span class="nx">eat</span><span class="p">(</span><span class="nx">_parenR</span><span class="p">))</span> <span class="p">{</span>
+    <span class="k">for</span> <span class="p">(;;)</span> <span class="p">{</span>
-      <span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="nx">first</span><span class="p">)</span> <span class="nx">expect</span><span class="p">(</span><span class="nx">_comma</span><span class="p">);</span> <span class="k">else</span> <span class="nx">first</span> <span class="o">=</span> <span class="kc">false</span><span class="p">;</span>
+      <span class="k">if</span> <span class="p">(</span><span class="nx">eat</span><span class="p">(</span><span class="nx">_parenR</span><span class="p">))</span> <span class="p">{</span>
-      <span class="nx">node</span><span class="p">.</span><span class="nx">params</span><span class="p">.</span><span class="nx">push</span><span class="p">(</span><span class="nx">parseIdent</span><span class="p">());</span>
+        <span class="k">break</span><span class="p">;</span>
+      <span class="p">}</span> <span class="k">else</span> <span class="k">if</span> <span class="p">(</span><span class="nx">options</span><span class="p">.</span><span class="nx">ecmaVersion</span> <span class="o">&gt;=</span> <span class="mi">6</span> <span class="o">&amp;&amp;</span> <span class="nx">eat</span><span class="p">(</span><span class="nx">_ellipsis</span><span class="p">))</span> <span class="p">{</span>
+        <span class="nx">node</span><span class="p">.</span><span class="nx">rest</span> <span class="o">=</span> <span class="nx">parseIdent</span><span class="p">();</span>
+        <span class="nx">expect</span><span class="p">(</span><span class="nx">_parenR</span><span class="p">);</span>
+        <span class="k">break</span><span class="p">;</span>
+      <span class="p">}</span> <span class="k">else</span> <span class="p">{</span>
+        <span class="nx">node</span><span class="p">.</span><span class="nx">params</span><span class="p">.</span><span class="nx">push</span><span class="p">(</span><span class="nx">parseIdent</span><span class="p">());</span>
+        <span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="nx">eat</span><span class="p">(</span><span class="nx">_comma</span><span class="p">))</span> <span class="p">{</span>
+          <span class="nx">expect</span><span class="p">(</span><span class="nx">_parenR</span><span class="p">);</span>
+          <span class="k">break</span><span class="p">;</span>
+        <span class="p">}</span>
+      <span class="p">}</span>
     <span class="p">}</span></pre></div>             </td>           </tr>                               <tr id="section-122">             <td class="docs">               <div class="pilwrap">                 <a class="pilcrow" href="#section-122">&#182;</a>               </div>               <p>Start a new scope with regard to labels and the <code>inFunction</code>
 flag (restore them to their old value afterwards).</p>             </td>             <td class="code">               <div class="highlight"><pre>    <span class="kd">var</span> <span class="nx">oldInFunc</span> <span class="o">=</span> <span class="nx">inFunction</span><span class="p">,</span> <span class="nx">oldLabels</span> <span class="o">=</span> <span class="nx">labels</span><span class="p">;</span>
     <span class="nx">inFunction</span> <span class="o">=</span> <span class="kc">true</span><span class="p">;</span> <span class="nx">labels</span> <span class="o">=</span> <span class="p">[];</span>