/
Parser.js
72 lines (62 loc) · 1.71 KB
/
Parser.js
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'use strict';
var EventEmitter = require('events').EventEmitter
var inherits = require('util').inherits
var Element = require('./Element')
var LtxParser = require('./parsers/ltx')
var Parser = function(options) {
EventEmitter.call(this)
var ParserInterface = this.Parser = (options && options.Parser) || LtxParser
var ElementInterface = this.Element = (options && options.Element) || Element
if (!ParserInterface) {
throw new Error('No SAX parser available')
}
this.parser = new ParserInterface()
var el
, self = this
this.parser.on('startElement', function(name, attrs) {
var child = new ElementInterface(name, attrs)
if (!el) {
el = child
} else {
el = el.cnode(child)
}
})
this.parser.on('endElement', function(name) {
/* jshint -W035 */
if (!el) {
/* Err */
} else if (name === el.name) {
if (el.parent) {
el = el.parent
} else if (!self.tree) {
self.tree = el
el = undefined
}
}
/* jshint +W035 */
})
this.parser.on('text', function(str) {
if (el) {
el.t(str)
}
})
this.parser.on('error', function(e) {
self.error = e
self.emit('error', e)
})
}
inherits(Parser, EventEmitter)
Parser.prototype.write = function(data) {
this.parser.write(data)
}
Parser.prototype.end = function(data) {
this.parser.end(data)
if (!this.error) {
if (this.tree) {
this.emit('tree', this.tree)
} else {
this.emit('error', new Error('Incomplete document'))
}
}
}
module.exports = Parser