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153 lines
2.3 KiB
153 lines
2.3 KiB
/**
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* Module dependencies.
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*/
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/**
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* Expose `parse`.
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*/
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/**
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* Parse the given string of `xml`.
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*
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* @param {String} xml
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* @return {Object}
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* @api public
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*/
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function parse(xml) {
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xml = xml.trim(); // strip comments
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xml = xml.replace(/<!--[\s\S]*?-->/g, '');
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return document();
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/**
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* XML document.
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*/
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function document() {
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return {
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declaration: declaration(),
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root: tag()
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};
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}
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/**
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* Declaration.
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*/
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function declaration() {
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const m = match(/^<\?xml\s*/);
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if (!m) return; // tag
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const node = {
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attributes: {}
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}; // attributes
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while (!(eos() || is('?>'))) {
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const attr = attribute();
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if (!attr) return node;
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node.attributes[attr.name] = attr.value;
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}
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match(/\?>\s*/);
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return node;
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}
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/**
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* Tag.
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*/
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function tag() {
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const m = match(/^<([\w-:.]+)\s*/);
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if (!m) return; // name
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const node = {
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name: m[1],
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attributes: {},
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children: []
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}; // attributes
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while (!(eos() || is('>') || is('?>') || is('/>'))) {
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const attr = attribute();
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if (!attr) return node;
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node.attributes[attr.name] = attr.value;
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} // self closing tag
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if (match(/^\s*\/>\s*/)) {
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return node;
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}
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match(/\??>\s*/); // content
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node.content = content(); // children
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let child;
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while (child = tag()) {
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node.children.push(child);
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} // closing
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match(/^<\/[\w-:.]+>\s*/);
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return node;
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}
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/**
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* Text content.
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*/
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function content() {
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const m = match(/^([^<]*)/);
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if (m) return m[1];
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return '';
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}
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/**
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* Attribute.
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*/
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function attribute() {
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const m = match(/([\w:-]+)\s*=\s*("[^"]*"|'[^']*'|\w+)\s*/);
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if (!m) return;
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return {
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name: m[1],
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value: strip(m[2])
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};
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}
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/**
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* Strip quotes from `val`.
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*/
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function strip(val) {
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return val.replace(/^['"]|['"]$/g, '');
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}
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/**
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* Match `re` and advance the string.
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*/
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function match(re) {
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const m = xml.match(re);
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if (!m) return;
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xml = xml.slice(m[0].length);
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return m;
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}
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/**
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* End-of-source.
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*/
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function eos() {
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return xml.length == 0;
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}
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/**
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* Check for `prefix`.
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*/
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function is(prefix) {
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return xml.indexOf(prefix) == 0;
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}
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}
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module.exports = parse; |