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rearrange isIdentifierStart

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abraidwood 2012-10-17 07:23:15 +01:00 committed by Marijn Haverbeke
parent 6b52dc8a84
commit c20cdbf8fc
2 changed files with 10 additions and 6 deletions
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8
acorn.js
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@ -363,9 +363,11 @@
// Test whether a given character code starts an identifier.
function isIdentifierStart(code) {
return (code >= 65 && code <= 90) || (code >= 97 && code <= 122) ||
code === 36 || code === 95 ||
(code >= 0xaa && nonASCIIidentifierStart.test(String.fromCharCode(code)));
if (code < 65) return code === 36;
if (code < 91) return true;
if (code < 97) return code === 95;
if (code < 123)return true;
return code >= 0xaa && nonASCIIidentifierStart.test(String.fromCharCode(code));
}
// Test whether a given character is part of an identifier.

8
index.html
View File

@ -200,9 +200,11 @@ code point above 128.</p> </td> <td class="code">
<span class="kd">var</span> <span class="nx">nonASCIIidentifierStart</span> <span class="o">=</span> <span class="k">new</span> <span class="nb">RegExp</span><span class="p">(</span><span class="s2">&quot;[&quot;</span> <span class="o">+</span> <span class="nx">nonASCIIidentifierStartChars</span> <span class="o">+</span> <span class="s2">&quot;]&quot;</span><span class="p">);</span>
<span class="kd">var</span> <span class="nx">nonASCIIidentifier</span> <span class="o">=</span> <span class="k">new</span> <span class="nb">RegExp</span><span class="p">(</span><span class="s2">&quot;[&quot;</span> <span class="o">+</span> <span class="nx">nonASCIIidentifierStartChars</span> <span class="o">+</span> <span class="nx">nonASCIIidentifierChars</span> <span class="o">+</span> <span class="s2">&quot;]&quot;</span><span class="p">);</span></pre></div> </td> </tr> <tr id="section-45"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-45">&#182;</a> </div> <p>Whether a single character denotes a newline.</p> </td> <td class="code"> <div class="highlight"><pre> <span class="kd">var</span> <span class="nx">newline</span> <span class="o">=</span> <span class="sr">/[\n\r\u2028\u2029]/</span><span class="p">;</span></pre></div> </td> </tr> <tr id="section-46"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-46">&#182;</a> </div> <p>Matches a whole line break (where CRLF is considered a single
line break). Used to count lines.</p> </td> <td class="code"> <div class="highlight"><pre> <span class="kd">var</span> <span class="nx">lineBreak</span> <span class="o">=</span> <span class="sr">/\r\n|[\n\r\u2028\u2029]/g</span><span class="p">;</span></pre></div> </td> </tr> <tr id="section-47"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-47">&#182;</a> </div> <p>Test whether a given character code starts an identifier.</p> </td> <td class="code"> <div class="highlight"><pre> <span class="kd">function</span> <span class="nx">isIdentifierStart</span><span class="p">(</span><span class="nx">code</span><span class="p">)</span> <span class="p">{</span>
<span class="k">return</span> <span class="p">(</span><span class="nx">code</span> <span class="o">&gt;=</span> <span class="mi">65</span> <span class="o">&amp;&amp;</span> <span class="nx">code</span> <span class="o">&lt;=</span> <span class="mi">90</span><span class="p">)</span> <span class="o">||</span> <span class="p">(</span><span class="nx">code</span> <span class="o">&gt;=</span> <span class="mi">97</span> <span class="o">&amp;&amp;</span> <span class="nx">code</span> <span class="o">&lt;=</span> <span class="mi">122</span><span class="p">)</span> <span class="o">||</span>
<span class="nx">code</span> <span class="o">===</span> <span class="mi">36</span> <span class="o">||</span> <span class="nx">code</span> <span class="o">===</span> <span class="mi">95</span> <span class="o">||</span>
<span class="p">(</span><span class="nx">code</span> <span class="o">&gt;=</span> <span class="mh">0xaa</span> <span class="o">&amp;&amp;</span> <span class="nx">nonASCIIidentifierStart</span><span class="p">.</span><span class="nx">test</span><span class="p">(</span><span class="nb">String</span><span class="p">.</span><span class="nx">fromCharCode</span><span class="p">(</span><span class="nx">code</span><span class="p">)));</span>
<span class="k">if</span> <span class="p">(</span><span class="nx">code</span> <span class="o">&lt;</span> <span class="mi">65</span><span class="p">)</span> <span class="k">return</span> <span class="nx">code</span> <span class="o">===</span> <span class="mi">36</span><span class="p">;</span>
<span class="k">if</span> <span class="p">(</span><span class="nx">code</span> <span class="o">&lt;</span> <span class="mi">91</span><span class="p">)</span> <span class="k">return</span> <span class="kc">true</span><span class="p">;</span>
<span class="k">if</span> <span class="p">(</span><span class="nx">code</span> <span class="o">&lt;</span> <span class="mi">97</span><span class="p">)</span> <span class="k">return</span> <span class="nx">code</span> <span class="o">===</span> <span class="mi">95</span><span class="p">;</span>
<span class="k">if</span> <span class="p">(</span><span class="nx">code</span> <span class="o">&lt;</span> <span class="mi">123</span><span class="p">)</span><span class="k">return</span> <span class="kc">true</span><span class="p">;</span>
<span class="k">return</span> <span class="nx">code</span> <span class="o">&gt;=</span> <span class="mh">0xaa</span> <span class="o">&amp;&amp;</span> <span class="nx">nonASCIIidentifierStart</span><span class="p">.</span><span class="nx">test</span><span class="p">(</span><span class="nb">String</span><span class="p">.</span><span class="nx">fromCharCode</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-48"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-48">&#182;</a> </div> <p>Test whether a given character is part of an identifier.</p> </td> <td class="code"> <div class="highlight"><pre> <span class="kd">function</span> <span class="nx">isIdentifierChar</span><span class="p">(</span><span class="nx">ch</span><span class="p">)</span> <span class="p">{</span>
<span class="k">return</span> <span class="p">((</span><span class="nx">ch</span> <span class="o">&gt;=</span> <span class="s2">&quot;a&quot;</span> <span class="o">&amp;&amp;</span> <span class="nx">ch</span> <span class="o">&lt;=</span> <span class="s2">&quot;z&quot;</span><span class="p">)</span> <span class="o">||</span> <span class="p">(</span><span class="nx">ch</span> <span class="o">&gt;=</span> <span class="s2">&quot;A&quot;</span> <span class="o">&amp;&amp;</span> <span class="nx">ch</span> <span class="o">&lt;=</span> <span class="s2">&quot;Z&quot;</span><span class="p">)</span> <span class="o">||</span>
<span class="p">(</span><span class="nx">ch</span> <span class="o">&gt;=</span> <span class="s2">&quot;0&quot;</span> <span class="o">&amp;&amp;</span> <span class="nx">ch</span> <span class="o">&lt;=</span> <span class="s2">&quot;9&quot;</span><span class="p">)</span> <span class="o">||</span> <span class="nx">ch</span> <span class="o">===</span> <span class="s2">&quot;$&quot;</span> <span class="o">||</span> <span class="nx">ch</span> <span class="o">===</span> <span class="s2">&quot;_&quot;</span> <span class="o">||</span>