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/**
* Split markup into a string of source code and an array mapping ranges in
* that string to the text nodes in which they appear.
*
* <p>
* The HTML DOM structure:</p>
* <pre>
* (Element "p"
* (Element "b"
* (Text "print ")) ; #1
* (Text "'Hello '") ; #2
* (Element "br") ; #3
* (Text " + 'World';")) ; #4
* </pre>
* <p>
* corresponds to the HTML
* {@code <p><b>print </b>'Hello '<br> + 'World';</p>}.</p>
*
* <p>
* It will produce the output:</p>
* <pre>
* {
* sourceCode: "print 'Hello '\n + 'World';",
* // 1 2
* // 012345678901234 5678901234567
* spans: [0, #1, 6, #2, 14, #3, 15, #4]
* }
* </pre>
* <p>
* where #1 is a reference to the {@code "print "} text node above, and so
* on for the other text nodes.
* </p>
*
* <p>
* The {@code} spans array is an array of pairs. Even elements are the start
* indices of substrings, and odd elements are the text nodes (or BR elements)
* that contain the text for those substrings.
* Substrings continue until the next index or the end of the source.
* </p>
*
* @param {Node} node an HTML DOM subtree containing source-code.
* @param {boolean} isPreformatted true if white-space in text nodes should
* be considered significant.
* @return {Object} source code and the text nodes in which they occur.
*/
function extractSourceSpans(node, isPreformatted) {
var nocode = /(?:^|\s)nocode(?:\s|$)/;
var chunks = [];
var length = 0;
var spans = [];
var k = 0;
function walk(node) {
var type = node.nodeType;
if (type == 1) { // Element
if (nocode.test(node.className)) { return; }
for (var child = node.firstChild; child; child = child.nextSibling) {
walk(child);
}
var nodeName = node.nodeName.toLowerCase();
if ('br' === nodeName || 'li' === nodeName) {
chunks[k] = '\n';
spans[k << 1] = length++;
spans[(k++ << 1) | 1] = node;
}
} else if (type == 3 || type == 4) { // Text
var text = node.nodeValue;
if (text.length) {
if (!isPreformatted) {
text = text.replace(/[ \t\r\n]+/g, ' ');
} else {
text = text.replace(/\r\n?/g, '\n'); // Normalize newlines.
}
// TODO: handle tabs here?
chunks[k] = text;
spans[k << 1] = length;
length += text.length;
spans[(k++ << 1) | 1] = node;
}
}
}
walk(node);
return {
sourceCode: chunks.join('').replace(/\n$/, ''),
spans: spans
};
}
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