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/*
Module dependencies
*/
var ElementType = require('domelementtype');
var entities = require('entities');
/* mixed-case SVG and MathML tags & attributes
recognized by the HTML parser, see
https://html.spec.whatwg.org/multipage/parsing.html#parsing-main-inforeign
*/
var foreignNames = require('./foreignNames.json');
foreignNames.elementNames.__proto__ = null; /* use as a simple dictionary */
foreignNames.attributeNames.__proto__ = null;
var unencodedElements = {
__proto__: null,
style: true,
script: true,
xmp: true,
iframe: true,
noembed: true,
noframes: true,
plaintext: true,
noscript: true
};
/*
Format attributes
*/
function formatAttrs(attributes, opts) {
if (!attributes) return;
var output = '';
var value;
// Loop through the attributes
for (var key in attributes) {
value = attributes[key];
if (output) {
output += ' ';
}
if (opts.xmlMode === 'foreign') {
/* fix up mixed-case attribute names */
key = foreignNames.attributeNames[key] || key;
}
output += key;
if ((value !== null && value !== '') || opts.xmlMode) {
output +=
'="' +
(opts.decodeEntities
? entities.encodeXML(value)
: value.replace(/\"/g, '"')) +
'"';
}
}
return output;
}
/*
Self-enclosing tags (stolen from node-htmlparser)
*/
var singleTag = {
__proto__: null,
area: true,
base: true,
basefont: true,
br: true,
col: true,
command: true,
embed: true,
frame: true,
hr: true,
img: true,
input: true,
isindex: true,
keygen: true,
link: true,
meta: true,
param: true,
source: true,
track: true,
wbr: true
};
var render = (module.exports = function(dom, opts) {
if (!Array.isArray(dom) && !dom.cheerio) dom = [dom];
opts = opts || {};
var output = '';
for (var i = 0; i < dom.length; i++) {
var elem = dom[i];
if (elem.type === 'root') output += render(elem.children, opts);
else if (ElementType.isTag(elem)) output += renderTag(elem, opts);
else if (elem.type === ElementType.Directive)
output += renderDirective(elem);
else if (elem.type === ElementType.Comment) output += renderComment(elem);
else if (elem.type === ElementType.CDATA) output += renderCdata(elem);
else output += renderText(elem, opts);
}
return output;
});
var foreignModeIntegrationPoints = [
'mi',
'mo',
'mn',
'ms',
'mtext',
'annotation-xml',
'foreignObject',
'desc',
'title'
];
function renderTag(elem, opts) {
// Handle SVG / MathML in HTML
if (opts.xmlMode === 'foreign') {
/* fix up mixed-case element names */
elem.name = foreignNames.elementNames[elem.name] || elem.name;
/* exit foreign mode at integration points */
if (
elem.parent &&
foreignModeIntegrationPoints.indexOf(elem.parent.name) >= 0
)
opts = Object.assign({}, opts, { xmlMode: false });
}
if (!opts.xmlMode && ['svg', 'math'].indexOf(elem.name) >= 0) {
opts = Object.assign({}, opts, { xmlMode: 'foreign' });
}
var tag = '<' + elem.name;
var attribs = formatAttrs(elem.attribs, opts);
if (attribs) {
tag += ' ' + attribs;
}
if (opts.xmlMode && (!elem.children || elem.children.length === 0)) {
tag += '/>';
} else {
tag += '>';
if (elem.children) {
tag += render(elem.children, opts);
}
if (!singleTag[elem.name] || opts.xmlMode) {
tag += '</' + elem.name + '>';
}
}
return tag;
}
function renderDirective(elem) {
return '<' + elem.data + '>';
}
function renderText(elem, opts) {
var data = elem.data || '';
// if entities weren't decoded, no need to encode them back
if (
opts.decodeEntities &&
!(elem.parent && elem.parent.name in unencodedElements)
) {
data = entities.encodeXML(data);
}
return data;
}
function renderCdata(elem) {
return '<![CDATA[' + elem.children[0].data + ']]>';
}
function renderComment(elem) {
return '<!--' + elem.data + '-->';
}