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isIdentifierChar to numeric

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Alistair Braidwood 2012-10-18 14:50:22 +01:00 committed by Marijn Haverbeke
parent c20cdbf8fc
commit 9bdbbaaf96
2 changed files with 40 additions and 30 deletions
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35
acorn.js
View File

@ -372,10 +372,14 @@
// Test whether a given character is part of an identifier. // Test whether a given character is part of an identifier.
function isIdentifierChar(ch) { function isIdentifierChar(code) {
return ((ch >= "a" && ch <= "z") || (ch >= "A" && ch <= "Z") || if (code < 48) return code === 36;
(ch >= "0" && ch <= "9") || ch === "$" || ch === "_" || if (code < 58) return true;
(ch >= "\xaa" && nonASCIIidentifier.test(ch))); if (code < 65) return false;
if (code < 91) return true;
if (code < 97) return code === 95;
if (code < 123)return true;
return code >= 0xaa && nonASCIIidentifier.test(String.fromCharCode(code));
} }
// ## Tokenizer // ## Tokenizer
@ -688,11 +692,11 @@
str += String.fromCharCode(parseInt(octal, 8)); str += String.fromCharCode(parseInt(octal, 8));
tokPos += octal.length - 1; tokPos += octal.length - 1;
} else if (ch === "x") { } else if (ch === "x") {
str += readHexChar(2); str += String.fromCharCode(readHexChar(2));
} else if (ch === "u") { } else if (ch === "u") {
str += readHexChar(4); str += String.fromCharCode(readHexChar(4));
} else if (ch === "U") { } else if (ch === "U") {
str += readHexChar(8); str += String.fromCharCode(readHexChar(8));
} else { } else {
switch (ch) { switch (ch) {
case "n" : str += "\n"; break; case "n" : str += "\n"; break;
@ -720,7 +724,7 @@
function readHexChar(len) { function readHexChar(len) {
var n = readInt(16, len); var n = readInt(16, len);
if (n === null) raise(tokStart, "Bad character escape sequence"); if (n === null) raise(tokStart, "Bad character escape sequence");
return String.fromCharCode(n); return n;
} }
// Used to signal to callers of `readWord1` whether the word // Used to signal to callers of `readWord1` whether the word
@ -739,21 +743,22 @@
containsEsc = false; containsEsc = false;
var word, first = true, start = tokPos; var word, first = true, start = tokPos;
for (;;) { for (;;) {
var ch = input.charAt(tokPos); var ch = input.charCodeAt(tokPos);
if (isIdentifierChar(ch)) { if (isIdentifierChar(ch)) {
if (containsEsc) word += ch; if (containsEsc) word += input.charAt(tokPos);
++tokPos; ++tokPos;
} else if (ch === "\\") { } else if (ch === 92) { // "\"
if (!containsEsc) word = input.slice(start, tokPos); if (!containsEsc) word = input.slice(start, tokPos);
containsEsc = true; containsEsc = true;
if (input.charAt(++tokPos) != "u") if (input.charCodeAt(++tokPos) != 117) // "u"
raise(tokPos, "Expecting Unicode escape sequence \\uXXXX"); raise(tokPos, "Expecting Unicode escape sequence \\uXXXX");
++tokPos; ++tokPos;
var esc = readHexChar(4); var esc = readHexChar(4);
if (!esc) raise(tokPos - 1, "Invalid Unicode escape"); var escStr = String.fromCharCode(esc);
if (!(first ? isIdentifierStart(esc.charCodeAt(0)) : isIdentifierChar(esc))) if (!escStr) raise(tokPos - 1, "Invalid Unicode escape");
if (!(first ? isIdentifierStart(esc) : isIdentifierChar(esc)))
raise(tokPos - 4, "Invalid Unicode escape"); raise(tokPos - 4, "Invalid Unicode escape");
word += esc; word += escStr;
} else { } else {
break; break;
} }

35
index.html
View File

@ -205,10 +205,14 @@ line break). Used to count lines.</p> </td> <td class="c
<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">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">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="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="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">code</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="k">if</span> <span class="p">(</span><span class="nx">code</span> <span class="o">&lt;</span> <span class="mi">48</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="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> <span class="k">if</span> <span class="p">(</span><span class="nx">code</span> <span class="o">&lt;</span> <span class="mi">58</span><span class="p">)</span> <span class="k">return</span> <span class="kc">true</span><span class="p">;</span>
<span class="p">(</span><span class="nx">ch</span> <span class="o">&gt;=</span> <span class="s2">&quot;\xaa&quot;</span> <span class="o">&amp;&amp;</span> <span class="nx">nonASCIIidentifier</span><span class="p">.</span><span class="nx">test</span><span class="p">(</span><span class="nx">ch</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="kc">false</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">nonASCIIidentifier</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-49"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-49">&#182;</a> </div> <h2>Tokenizer</h2> </td> <td class="code"> <div class="highlight"><pre></pre></div> </td> </tr> <tr id="section-50"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-50">&#182;</a> </div> <p>These are used when <code>options.locations</code> is on, in order to track <span class="p">}</span></pre></div> </td> </tr> <tr id="section-49"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-49">&#182;</a> </div> <h2>Tokenizer</h2> </td> <td class="code"> <div class="highlight"><pre></pre></div> </td> </tr> <tr id="section-50"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-50">&#182;</a> </div> <p>These are used when <code>options.locations</code> is on, in order to track
the current line number and start of line offset, in order to set the current line number and start of line offset, in order to set
<code>tokStartLoc</code> and <code>tokEndLoc</code>.</p> </td> <td class="code"> <div class="highlight"><pre> <span class="kd">function</span> <span class="nx">nextLineStart</span><span class="p">()</span> <span class="p">{</span> <code>tokStartLoc</code> and <code>tokEndLoc</code>.</p> </td> <td class="code"> <div class="highlight"><pre> <span class="kd">function</span> <span class="nx">nextLineStart</span><span class="p">()</span> <span class="p">{</span>
@ -458,11 +462,11 @@ will return <code>null</code> unless the integer has exactly <code>len</code> di
<span class="nx">str</span> <span class="o">+=</span> <span class="nb">String</span><span class="p">.</span><span class="nx">fromCharCode</span><span class="p">(</span><span class="nb">parseInt</span><span class="p">(</span><span class="nx">octal</span><span class="p">,</span> <span class="mi">8</span><span class="p">));</span> <span class="nx">str</span> <span class="o">+=</span> <span class="nb">String</span><span class="p">.</span><span class="nx">fromCharCode</span><span class="p">(</span><span class="nb">parseInt</span><span class="p">(</span><span class="nx">octal</span><span class="p">,</span> <span class="mi">8</span><span class="p">));</span>
<span class="nx">tokPos</span> <span class="o">+=</span> <span class="nx">octal</span><span class="p">.</span><span class="nx">length</span> <span class="o">-</span> <span class="mi">1</span><span class="p">;</span> <span class="nx">tokPos</span> <span class="o">+=</span> <span class="nx">octal</span><span class="p">.</span><span class="nx">length</span> <span class="o">-</span> <span class="mi">1</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">ch</span> <span class="o">===</span> <span class="s2">&quot;x&quot;</span><span class="p">)</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">ch</span> <span class="o">===</span> <span class="s2">&quot;x&quot;</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">str</span> <span class="o">+=</span> <span class="nx">readHexChar</span><span class="p">(</span><span class="mi">2</span><span class="p">);</span> <span class="nx">str</span> <span class="o">+=</span> <span class="nb">String</span><span class="p">.</span><span class="nx">fromCharCode</span><span class="p">(</span><span class="nx">readHexChar</span><span class="p">(</span><span class="mi">2</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">ch</span> <span class="o">===</span> <span class="s2">&quot;u&quot;</span><span class="p">)</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">ch</span> <span class="o">===</span> <span class="s2">&quot;u&quot;</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">str</span> <span class="o">+=</span> <span class="nx">readHexChar</span><span class="p">(</span><span class="mi">4</span><span class="p">);</span> <span class="nx">str</span> <span class="o">+=</span> <span class="nb">String</span><span class="p">.</span><span class="nx">fromCharCode</span><span class="p">(</span><span class="nx">readHexChar</span><span class="p">(</span><span class="mi">4</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">ch</span> <span class="o">===</span> <span class="s2">&quot;U&quot;</span><span class="p">)</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">ch</span> <span class="o">===</span> <span class="s2">&quot;U&quot;</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">str</span> <span class="o">+=</span> <span class="nx">readHexChar</span><span class="p">(</span><span class="mi">8</span><span class="p">);</span> <span class="nx">str</span> <span class="o">+=</span> <span class="nb">String</span><span class="p">.</span><span class="nx">fromCharCode</span><span class="p">(</span><span class="nx">readHexChar</span><span class="p">(</span><span class="mi">8</span><span class="p">));</span>
<span class="p">}</span> <span class="k">else</span> <span class="p">{</span> <span class="p">}</span> <span class="k">else</span> <span class="p">{</span>
<span class="k">switch</span> <span class="p">(</span><span class="nx">ch</span><span class="p">)</span> <span class="p">{</span> <span class="k">switch</span> <span class="p">(</span><span class="nx">ch</span><span class="p">)</span> <span class="p">{</span>
<span class="k">case</span> <span class="s2">&quot;n&quot;</span> <span class="o">:</span> <span class="nx">str</span> <span class="o">+=</span> <span class="s2">&quot;\n&quot;</span><span class="p">;</span> <span class="k">break</span><span class="p">;</span> <span class="k">case</span> <span class="s2">&quot;n&quot;</span> <span class="o">:</span> <span class="nx">str</span> <span class="o">+=</span> <span class="s2">&quot;\n&quot;</span><span class="p">;</span> <span class="k">break</span><span class="p">;</span>
@ -486,7 +490,7 @@ will return <code>null</code> unless the integer has exactly <code>len</code> di
<span class="p">}</span></pre></div> </td> </tr> <tr id="section-69"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-69">&#182;</a> </div> <p>Used to read character escape sequences ('\x', '\u', '\U').</p> </td> <td class="code"> <div class="highlight"><pre> <span class="kd">function</span> <span class="nx">readHexChar</span><span class="p">(</span><span class="nx">len</span><span class="p">)</span> <span class="p">{</span> <span class="p">}</span></pre></div> </td> </tr> <tr id="section-69"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-69">&#182;</a> </div> <p>Used to read character escape sequences ('\x', '\u', '\U').</p> </td> <td class="code"> <div class="highlight"><pre> <span class="kd">function</span> <span class="nx">readHexChar</span><span class="p">(</span><span class="nx">len</span><span class="p">)</span> <span class="p">{</span>
<span class="kd">var</span> <span class="nx">n</span> <span class="o">=</span> <span class="nx">readInt</span><span class="p">(</span><span class="mi">16</span><span class="p">,</span> <span class="nx">len</span><span class="p">);</span> <span class="kd">var</span> <span class="nx">n</span> <span class="o">=</span> <span class="nx">readInt</span><span class="p">(</span><span class="mi">16</span><span class="p">,</span> <span class="nx">len</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="nx">n</span> <span class="o">===</span> <span class="kc">null</span><span class="p">)</span> <span class="nx">raise</span><span class="p">(</span><span class="nx">tokStart</span><span class="p">,</span> <span class="s2">&quot;Bad character escape sequence&quot;</span><span class="p">);</span> <span class="k">if</span> <span class="p">(</span><span class="nx">n</span> <span class="o">===</span> <span class="kc">null</span><span class="p">)</span> <span class="nx">raise</span><span class="p">(</span><span class="nx">tokStart</span><span class="p">,</span> <span class="s2">&quot;Bad character escape sequence&quot;</span><span class="p">);</span>
<span class="k">return</span> <span class="nb">String</span><span class="p">.</span><span class="nx">fromCharCode</span><span class="p">(</span><span class="nx">n</span><span class="p">);</span> <span class="k">return</span> <span class="nx">n</span><span class="p">;</span>
<span class="p">}</span></pre></div> </td> </tr> <tr id="section-70"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-70">&#182;</a> </div> <p>Used to signal to callers of <code>readWord1</code> whether the word <span class="p">}</span></pre></div> </td> </tr> <tr id="section-70"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-70">&#182;</a> </div> <p>Used to signal to callers of <code>readWord1</code> whether the word
contained any escape sequences. This is needed because words with contained any escape sequences. This is needed because words with
escape sequences must not be interpreted as keywords.</p> </td> <td class="code"> <div class="highlight"><pre> <span class="kd">var</span> <span class="nx">containsEsc</span><span class="p">;</span></pre></div> </td> </tr> <tr id="section-71"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-71">&#182;</a> </div> <p>Read an identifier, and return it as a string. Sets <code>containsEsc</code> escape sequences must not be interpreted as keywords.</p> </td> <td class="code"> <div class="highlight"><pre> <span class="kd">var</span> <span class="nx">containsEsc</span><span class="p">;</span></pre></div> </td> </tr> <tr id="section-71"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-71">&#182;</a> </div> <p>Read an identifier, and return it as a string. Sets <code>containsEsc</code>
@ -497,21 +501,22 @@ containeds an escape, as a micro-optimization.</p> </td>
<span class="nx">containsEsc</span> <span class="o">=</span> <span class="kc">false</span><span class="p">;</span> <span class="nx">containsEsc</span> <span class="o">=</span> <span class="kc">false</span><span class="p">;</span>
<span class="kd">var</span> <span class="nx">word</span><span class="p">,</span> <span class="nx">first</span> <span class="o">=</span> <span class="kc">true</span><span class="p">,</span> <span class="nx">start</span> <span class="o">=</span> <span class="nx">tokPos</span><span class="p">;</span> <span class="kd">var</span> <span class="nx">word</span><span class="p">,</span> <span class="nx">first</span> <span class="o">=</span> <span class="kc">true</span><span class="p">,</span> <span class="nx">start</span> <span class="o">=</span> <span class="nx">tokPos</span><span class="p">;</span>
<span class="k">for</span> <span class="p">(;;)</span> <span class="p">{</span> <span class="k">for</span> <span class="p">(;;)</span> <span class="p">{</span>
<span class="kd">var</span> <span class="nx">ch</span> <span class="o">=</span> <span class="nx">input</span><span class="p">.</span><span class="nx">charAt</span><span class="p">(</span><span class="nx">tokPos</span><span class="p">);</span> <span class="kd">var</span> <span class="nx">ch</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="p">);</span>
<span class="k">if</span> <span class="p">(</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">if</span> <span class="p">(</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">if</span> <span class="p">(</span><span class="nx">containsEsc</span><span class="p">)</span> <span class="nx">word</span> <span class="o">+=</span> <span class="nx">ch</span><span class="p">;</span> <span class="k">if</span> <span class="p">(</span><span class="nx">containsEsc</span><span class="p">)</span> <span class="nx">word</span> <span class="o">+=</span> <span class="nx">input</span><span class="p">.</span><span class="nx">charAt</span><span class="p">(</span><span class="nx">tokPos</span><span class="p">);</span>
<span class="o">++</span><span class="nx">tokPos</span><span class="p">;</span> <span class="o">++</span><span class="nx">tokPos</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">ch</span> <span class="o">===</span> <span class="s2">&quot;\\&quot;</span><span class="p">)</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">ch</span> <span class="o">===</span> <span class="mi">92</span><span class="p">)</span> <span class="p">{</span> <span class="c1">// &quot;\&quot;</span>
<span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="nx">containsEsc</span><span class="p">)</span> <span class="nx">word</span> <span class="o">=</span> <span class="nx">input</span><span class="p">.</span><span class="nx">slice</span><span class="p">(</span><span class="nx">start</span><span class="p">,</span> <span class="nx">tokPos</span><span class="p">);</span> <span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="nx">containsEsc</span><span class="p">)</span> <span class="nx">word</span> <span class="o">=</span> <span class="nx">input</span><span class="p">.</span><span class="nx">slice</span><span class="p">(</span><span class="nx">start</span><span class="p">,</span> <span class="nx">tokPos</span><span class="p">);</span>
<span class="nx">containsEsc</span> <span class="o">=</span> <span class="kc">true</span><span class="p">;</span> <span class="nx">containsEsc</span> <span class="o">=</span> <span class="kc">true</span><span class="p">;</span>
<span class="k">if</span> <span class="p">(</span><span class="nx">input</span><span class="p">.</span><span class="nx">charAt</span><span class="p">(</span><span class="o">++</span><span class="nx">tokPos</span><span class="p">)</span> <span class="o">!=</span> <span class="s2">&quot;u&quot;</span><span class="p">)</span> <span class="k">if</span> <span class="p">(</span><span class="nx">input</span><span class="p">.</span><span class="nx">charCodeAt</span><span class="p">(</span><span class="o">++</span><span class="nx">tokPos</span><span class="p">)</span> <span class="o">!=</span> <span class="mi">117</span><span class="p">)</span> <span class="c1">// &quot;u&quot;</span>
<span class="nx">raise</span><span class="p">(</span><span class="nx">tokPos</span><span class="p">,</span> <span class="s2">&quot;Expecting Unicode escape sequence \\uXXXX&quot;</span><span class="p">);</span> <span class="nx">raise</span><span class="p">(</span><span class="nx">tokPos</span><span class="p">,</span> <span class="s2">&quot;Expecting Unicode escape sequence \\uXXXX&quot;</span><span class="p">);</span>
<span class="o">++</span><span class="nx">tokPos</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">esc</span> <span class="o">=</span> <span class="nx">readHexChar</span><span class="p">(</span><span class="mi">4</span><span class="p">);</span> <span class="kd">var</span> <span class="nx">esc</span> <span class="o">=</span> <span class="nx">readHexChar</span><span class="p">(</span><span class="mi">4</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="nx">esc</span><span class="p">)</span> <span class="nx">raise</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="s2">&quot;Invalid Unicode escape&quot;</span><span class="p">);</span> <span class="kd">var</span> <span class="nx">escStr</span> <span class="o">=</span> <span class="nb">String</span><span class="p">.</span><span class="nx">fromCharCode</span><span class="p">(</span><span class="nx">esc</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="p">(</span><span class="nx">first</span> <span class="o">?</span> <span class="nx">isIdentifierStart</span><span class="p">(</span><span class="nx">esc</span><span class="p">.</span><span class="nx">charCodeAt</span><span class="p">(</span><span class="mi">0</span><span class="p">))</span> <span class="o">:</span> <span class="nx">isIdentifierChar</span><span class="p">(</span><span class="nx">esc</span><span class="p">)))</span> <span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="nx">escStr</span><span class="p">)</span> <span class="nx">raise</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="s2">&quot;Invalid Unicode escape&quot;</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="p">(</span><span class="nx">first</span> <span class="o">?</span> <span class="nx">isIdentifierStart</span><span class="p">(</span><span class="nx">esc</span><span class="p">)</span> <span class="o">:</span> <span class="nx">isIdentifierChar</span><span class="p">(</span><span class="nx">esc</span><span class="p">)))</span>
<span class="nx">raise</span><span class="p">(</span><span class="nx">tokPos</span> <span class="o">-</span> <span class="mi">4</span><span class="p">,</span> <span class="s2">&quot;Invalid Unicode escape&quot;</span><span class="p">);</span> <span class="nx">raise</span><span class="p">(</span><span class="nx">tokPos</span> <span class="o">-</span> <span class="mi">4</span><span class="p">,</span> <span class="s2">&quot;Invalid Unicode escape&quot;</span><span class="p">);</span>
<span class="nx">word</span> <span class="o">+=</span> <span class="nx">esc</span><span class="p">;</span> <span class="nx">word</span> <span class="o">+=</span> <span class="nx">escStr</span><span class="p">;</span>
<span class="p">}</span> <span class="k">else</span> <span class="p">{</span> <span class="p">}</span> <span class="k">else</span> <span class="p">{</span>
<span class="k">break</span><span class="p">;</span> <span class="k">break</span><span class="p">;</span>
<span class="p">}</span> <span class="p">}</span>