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ParserHtml.js
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ParserHtml.js
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import { each, isString } from 'underscore';
export default config => {
var TEXT_NODE = 'span';
var c = config;
var modelAttrStart = 'data-gjs-';
return {
compTypes: '',
modelAttrStart,
/**
* Extract component props from an attribute object
* @param {Object} attr
* @returns {Object} An object containing props and attributes without them
*/
splitPropsFromAttr(attr = {}) {
const props = {};
const attrs = {};
each(attr, (value, key) => {
if (key.indexOf(this.modelAttrStart) === 0) {
const modelAttr = key.replace(modelAttrStart, '');
const valueLen = value.length;
const valStr = value && isString(value);
const firstChar = valStr && value.substr(0, 1);
const lastChar = valStr && value.substr(valueLen - 1);
value = value === 'true' ? true : value;
value = value === 'false' ? false : value;
// Try to parse JSON where it's possible
// I can get false positive here (eg. a selector '[data-attr]')
// so put it under try/catch and let fail silently
try {
value =
(firstChar == '{' && lastChar == '}') ||
(firstChar == '[' && lastChar == ']')
? JSON.parse(value)
: value;
} catch (e) {}
props[modelAttr] = value;
} else {
attrs[key] = value;
}
});
return {
props,
attrs
};
},
/**
* Parse style string to object
* @param {string} str
* @return {Object}
* @example
* var stl = ParserHtml.parseStyle('color:black; width:100px; test:value;');
* console.log(stl);
* // {color: 'black', width: '100px', test: 'value'}
*/
parseStyle(str) {
var result = {};
var decls = str.split(';');
for (var i = 0, len = decls.length; i < len; i++) {
var decl = decls[i].trim();
if (!decl) continue;
var prop = decl.split(':');
result[prop[0].trim()] = prop
.slice(1)
.join(':')
.trim();
}
return result;
},
/**
* Parse class string to array
* @param {string} str
* @return {Array<string>}
* @example
* var res = ParserHtml.parseClass('test1 test2 test3');
* console.log(res);
* // ['test1', 'test2', 'test3']
*/
parseClass(str) {
const result = [];
const cls = str.split(' ');
for (let i = 0, len = cls.length; i < len; i++) {
const cl = cls[i].trim();
if (!cl) continue;
result.push(cl);
}
return result;
},
/**
* Get data from the node element
* @param {HTMLElement} el DOM element to traverse
* @return {Array<Object>}
*/
parseNode(el) {
const result = [];
const nodes = el.childNodes;
for (var i = 0, len = nodes.length; i < len; i++) {
const node = nodes[i];
const attrs = node.attributes || [];
const attrsLen = attrs.length;
const nodePrev = result[result.length - 1];
const nodeChild = node.childNodes.length;
const ct = this.compTypes;
let model = {};
// Start with understanding what kind of component it is
if (ct) {
let obj = '';
let type =
node.getAttribute && node.getAttribute(`${modelAttrStart}type`);
// If the type is already defined, use it
if (type) {
model = { type };
} else {
// Iterate over all available Component Types and
// the first with a valid result will be that component
for (let it = 0; it < ct.length; it++) {
const compType = ct[it];
obj = compType.model.isComponent(node);
if (obj) {
if (typeof obj !== 'object') {
obj = { type: compType.id };
}
break;
}
}
model = obj;
}
}
// Set tag name if not yet done
if (!model.tagName) {
model.tagName = node.tagName ? node.tagName.toLowerCase() : '';
}
if (attrsLen) {
model.attributes = {};
}
// Parse attributes
for (let j = 0; j < attrsLen; j++) {
const nodeName = attrs[j].nodeName;
let nodeValue = attrs[j].nodeValue;
// Isolate attributes
if (nodeName == 'style') {
model.style = this.parseStyle(nodeValue);
} else if (nodeName == 'class') {
model.classes = this.parseClass(nodeValue);
} else if (nodeName == 'contenteditable') {
continue;
} else if (nodeName.indexOf(modelAttrStart) === 0) {
const modelAttr = nodeName.replace(modelAttrStart, '');
const valueLen = nodeValue.length;
const firstChar = nodeValue && nodeValue.substr(0, 1);
const lastChar = nodeValue && nodeValue.substr(valueLen - 1);
nodeValue = nodeValue === 'true' ? true : nodeValue;
nodeValue = nodeValue === 'false' ? false : nodeValue;
// Try to parse JSON where it's possible
// I can get false positive here (eg. a selector '[data-attr]')
// so put it under try/catch and let fail silently
try {
nodeValue =
(firstChar == '{' && lastChar == '}') ||
(firstChar == '[' && lastChar == ']')
? JSON.parse(nodeValue)
: nodeValue;
} catch (e) {}
model[modelAttr] = nodeValue;
} else {
model.attributes[nodeName] = nodeValue;
}
}
// Check for nested elements but avoid it if already provided
if (nodeChild && !model.components) {
// Avoid infinite nested text nodes
const firstChild = node.childNodes[0];
// If there is only one child and it's a TEXTNODE
// just make it content of the current node
if (nodeChild === 1 && firstChild.nodeType === 3) {
!model.type && (model.type = 'text');
model.content = firstChild.nodeValue;
} else {
model.components = this.parseNode(node);
}
}
// Check if it's a text node and if could be moved to the prevous model
if (model.type == 'textnode') {
if (nodePrev && nodePrev.type == 'textnode') {
nodePrev.content += model.content;
continue;
}
// Throw away empty nodes (keep spaces)
if (!config.keepEmptyTextNodes) {
const content = node.nodeValue;
if (content != ' ' && !content.trim()) {
continue;
}
}
}
// If all children are texts and there is some textnode the parent should
// be text too otherwise I'm unable to edit texnodes
const comps = model.components;
if (!model.type && comps) {
let allTxt = 1;
let foundTextNode = 0;
for (let ci = 0; ci < comps.length; ci++) {
const comp = comps[ci];
const cType = comp.type;
if (
['text', 'textnode'].indexOf(cType) < 0 &&
c.textTags.indexOf(comp.tagName) < 0
) {
allTxt = 0;
break;
}
if (cType == 'textnode') {
foundTextNode = 1;
}
}
if (allTxt && foundTextNode) {
model.type = 'text';
}
}
// If tagName is still empty and is not a textnode, do not push it
if (!model.tagName && model.type != 'textnode') {
continue;
}
result.push(model);
}
return result;
},
/**
* Parse HTML string to a desired model object
* @param {string} str HTML string
* @param {ParserCss} parserCss In case there is style tags inside HTML
* @return {Object}
*/
parse(str, parserCss) {
var config = (c.em && c.em.get('Config')) || {};
var res = { html: '', css: '' };
var el = document.createElement('div');
el.innerHTML = str;
var scripts = el.querySelectorAll('script');
var i = scripts.length;
// Remove all scripts
if (!config.allowScripts) {
while (i--) scripts[i].parentNode.removeChild(scripts[i]);
}
// Detach style tags and parse them
if (parserCss) {
var styleStr = '';
var styles = el.querySelectorAll('style');
var j = styles.length;
while (j--) {
styleStr = styles[j].innerHTML + styleStr;
styles[j].parentNode.removeChild(styles[j]);
}
if (styleStr) res.css = parserCss.parse(styleStr);
}
var result = this.parseNode(el);
if (result.length == 1) result = result[0];
res.html = result;
return res;
}
};
};