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Add walk.findNodeBefore

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This commit is contained in:
Marijn Haverbeke 2013-02-28 19:27:29 +01:00
parent 83cdcf7dbf
commit 0b10aa2256
2 changed files with 19 additions and 2 deletions
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3
index.html
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@ -464,7 +464,8 @@ of the type given by its first argument.</p> </td> <td c
<span class="p">}</span>
<span class="kd">function</span> <span class="nx">readToken</span><span class="p">(</span><span class="nx">forceRegexp</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">tokStart</span> <span class="o">=</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">forceRegexp</span><span class="p">)</span> <span class="nx">tokStart</span> <span class="o">=</span> <span class="nx">tokPos</span><span class="p">;</span>
<span class="k">else</span> <span class="nx">tokPos</span> <span class="o">=</span> <span class="nx">tokStart</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">options</span><span class="p">.</span><span class="nx">locations</span><span class="p">)</span> <span class="nx">tokStartLoc</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">line_loc_t</span><span class="p">;</span>
<span class="k">if</span> <span class="p">(</span><span class="nx">forceRegexp</span><span class="p">)</span> <span class="k">return</span> <span class="nx">readRegexp</span><span class="p">();</span>
<span class="k">if</span> <span class="p">(</span><span class="nx">tokPos</span> <span class="o">&gt;=</span> <span class="nx">inputLen</span><span class="p">)</span> <span class="k">return</span> <span class="nx">finishToken</span><span class="p">(</span><span class="nx">_eof</span><span class="p">);</span>

18
util/walk.js
View File

@ -103,7 +103,7 @@
var c = function(node, st, override) {
if (node.end < pos) return;
var type = override || node.type;
if (node.start >= pos && test(node, type)) throw new Found(node, st);
if (node.start >= pos && test(type, node)) throw new Found(node, st);
base[type](node, st, c);
};
c(node, state);
@ -113,6 +113,22 @@
}
};
// Find the outermost matching node before a given position.
exports.findNodeBefore = function(node, pos, test, base, state) {
test = makeTest(test);
if (!base) base = exports.base;
var max;
var c = function(node, st, override) {
if (node.start > pos) return;
var type = override || node.type;
if (node.end <= pos && (!max || max.node.end < node.end) && test(type, node))
max = new Found(node, st);
base[type](node, st, c);
};
c(node, state);
return max;
};
// Used to create a custom walker. Will fill in all missing node
// type properties with the defaults.
exports.make = function(funcs, base) {