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extractValues.js
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59 lines (51 loc) · 1.64 KB
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'use strict';
/**
* Extract values from a stream.
*/
exports.extractValues = extractValues;
var sax = require('sax/lib/sax');
var saxStrict = true;
var saxOptions = {};
var validXMLTagNames = { char: 'Y', reserved: 'Y', surrogate: 'Y', noncharacter: 'Y'};
function extractValues(stream, propertiesToExtract, callback) {
var saxStream = sax.createStream(saxStrict, saxOptions);
var firstValid = {};
var lastValid = {};
var keys = Object.keys(propertiesToExtract);
var keyValues = keys.map(function(k) { return propertiesToExtract[k]; });
var validRanges = {};
for (var i in keys) {
validRanges[keys[i] + '_' + keyValues[i]] = [];
}
saxStream.onopentag = onOpenTag;
stream
.pipe(saxStream)
.on('end', doCallback);
function onOpenTag(node) {
var property;
if (validXMLTagNames[node.name]) {
for (var i in keys) {
property = keyValues[i];
if (node.attributes[keys[i]] === property) validProperty(keys[i] + '_' + property, node);
else invalidProperty(keys[i] + '_' + property);
}
}
}
function validProperty(property, node) {
if (!firstValid[property]) firstValid[property] =
node.attributes.cp || node.attributes['first-cp'];
lastValid[property] = node.attributes.cp || node.attributes['last-cp'];
}
function invalidProperty(property) {
if (!firstValid[property]) return;
validRanges[property].push([firstValid[property], lastValid[property]]);
firstValid[property] = null;
}
function doCallback() {
for (var i in keys) {
var property = keys[i] + '_' + keyValues[i];
invalidProperty(property);
}
callback(validRanges);
}
}