Huanyuyuehui/components/jyf-parser/libs/MpHtmlParser.js

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/*
将 html 解析为适用于小程序 rich-text 的 DOM 结构
githubhttps://github.com/jin-yufeng/Parser
docshttps://jin-yufeng.github.io/Parser
authorJinYufeng
update2020/04/13
*/
var cfg = require('./config.js'),
blankChar = cfg.blankChar,
CssHandler = require('./CssHandler.js'),
{
screenWidth,
system
} = wx.getSystemInfoSync();
// #ifdef MP-BAIDU || MP-ALIPAY || MP-TOUTIAO
var entities = {
lt: '<',
gt: '>',
amp: '&',
quot: '"',
apos: "'",
nbsp: '\xA0',
ensp: '\u2002',
emsp: '\u2003',
ndash: '',
mdash: '—',
middot: '·',
lsquo: '',
rsquo: '',
ldquo: '“',
rdquo: '”',
bull: '•',
hellip: '…',
permil: '‰',
copy: '©',
reg: '®',
trade: '™',
times: '×',
divide: '÷',
cent: '¢',
pound: '£',
yen: '¥',
euro: '€',
sect: '§'
};
// #endif
var emoji; // emoji 补丁包 https://jin-yufeng.github.io/Parser/#/instructions?id=emoji
class MpHtmlParser {
constructor(data, options = {}) {
this.attrs = {};
this.compress = options.compress;
this.CssHandler = new CssHandler(options.tagStyle, screenWidth);
this.data = data;
this.domain = options.domain;
this.DOM = [];
this.i = this.start = this.audioNum = this.imgNum = this.videoNum = 0;
this.protocol = this.domain && this.domain.includes('://') ? this.domain.split('://')[0] : '';
this.state = this.Text;
this.STACK = [];
this.useAnchor = options.useAnchor;
this.xml = options.xml;
}
parse() {
if (emoji) this.data = emoji.parseEmoji(this.data);
for (var c; c = this.data[this.i]; this.i++)
this.state(c);
if (this.state == this.Text) this.setText();
while (this.STACK.length) this.popNode(this.STACK.pop());
// #ifdef MP-BAIDU || MP-TOUTIAO
// 将顶层标签的一些样式提取出来给 rich-text
(function f(ns) {
for (var i = ns.length, n; n = ns[--i];) {
if (n.type == 'text') continue;
if (!n.c) {
var style = n.attrs.style;
if (style) {
var j, k, res;
if ((j = style.indexOf('display')) != -1)
res = style.substring(j, (k = style.indexOf(';', j)) == -1 ? style.length : k);
if ((j = style.indexOf('float')) != -1)
res += ';' + style.substring(j, (k = style.indexOf(';', j)) == -1 ? style.length : k);
n.attrs.contain = res;
}
} else f(n.children);
}
})(this.DOM);
// #endif
if (this.DOM.length) {
this.DOM[0].PoweredBy = 'Parser';
if (this.title) this.DOM[0].title = this.title;
}
return this.DOM;
}
// 设置属性
setAttr() {
var name = this.getName(this.attrName);
if (cfg.trustAttrs[name]) {
if (!this.attrVal) {
if (cfg.boolAttrs[name]) this.attrs[name] = 'T';
} else if (name == 'src') this.attrs[name] = this.getUrl(this.attrVal.replace(/&amp;/g, '&'));
else this.attrs[name] = this.attrVal;
}
this.attrVal = '';
while (blankChar[this.data[this.i]]) this.i++;
if (this.isClose()) this.setNode();
else {
this.start = this.i;
this.state = this.AttrName;
}
}
// 设置文本节点
setText() {
var back, text = this.section();
if (!text) return;
text = (cfg.onText && cfg.onText(text, () => back = true)) || text;
if (back) {
this.data = this.data.substr(0, this.start) + text + this.data.substr(this.i);
let j = this.start + text.length;
for (this.i = this.start; this.i < j; this.i++) this.state(this.data[this.i]);
return;
}
if (!this.pre) {
// 合并空白符
var tmp = [];
for (let i = text.length, c; c = text[--i];)
if (!blankChar[c] || (!blankChar[tmp[0]] && (c = ' '))) tmp.unshift(c);
text = tmp.join('');
if (text == ' ') return;
}
// 处理实体
var siblings = this.siblings(),
i = -1,
j, en;
while (1) {
if ((i = text.indexOf('&', i + 1)) == -1) break;
if ((j = text.indexOf(';', i + 2)) == -1) break;
if (text[i + 1] == '#') {
en = parseInt((text[i + 2] == 'x' ? '0' : '') + text.substring(i + 2, j));
if (!isNaN(en)) text = text.substr(0, i) + String.fromCharCode(en) + text.substring(j + 1);
} else {
en = text.substring(i + 1, j);
// #ifdef MP-WEIXIN || MP-QQ || APP-PLUS
if (en == 'nbsp') text = text.substr(0, i) + '\xA0' + text.substr(j + 1); // 解决 &nbsp; 失效
else if (en != 'lt' && en != 'gt' && en != 'amp' && en != 'ensp' && en != 'emsp' && en != 'quot' && en != 'apos') {
i && siblings.push({
type: 'text',
text: text.substr(0, i)
})
siblings.push({
type: 'text',
text: `&${en};`,
en: 1
})
text = text.substr(j + 1);
i = -1;
}
// #endif
// #ifdef MP-BAIDU || MP-ALIPAY || MP-TOUTIAO
if (entities[en]) text = text.substr(0, i) + entities[en] + text.substr(j + 1);
// #endif
}
}
text && siblings.push({
type: 'text',
text
})
}
// 设置元素节点
setNode() {
var node = {
name: this.tagName.toLowerCase(),
attrs: this.attrs
},
close = cfg.selfClosingTags[node.name] || (this.xml && this.data[this.i] == '/');
this.attrs = {};
if (!cfg.ignoreTags[node.name]) {
this.matchAttr(node);
if (!close) {
node.children = [];
if (node.name == 'pre' && cfg.highlight) {
this.remove(node);
this.pre = node.pre = true;
}
this.siblings().push(node);
this.STACK.push(node);
} else if (!cfg.filter || cfg.filter(node, this) != false)
this.siblings().push(node);
} else {
if (!close) this.remove(node);
else if (node.name == 'source') {
var parent = this.STACK[this.STACK.length - 1],
attrs = node.attrs;
if (parent && attrs.src)
if (parent.name == 'video' || parent.name == 'audio')
parent.attrs.source.push(attrs.src);
else {
var i, media = attrs.media;
if (parent.name == 'picture' && !parent.attrs.src && !(attrs.src.indexOf('.webp') && system.includes('iOS')) &&
(!media || (media.includes('px') &&
(((i = media.indexOf('min-width')) != -1 && (i = media.indexOf(':', i + 8)) != -1 && screenWidth > parseInt(
media.substr(i + 1))) ||
((i = media.indexOf('max-width')) != -1 && (i = media.indexOf(':', i + 8)) != -1 && screenWidth < parseInt(
media.substr(i + 1)))))))
parent.attrs.src = attrs.src;
}
} else if (node.name == 'base' && !this.domain) this.domain = node.attrs.href;
}
if (this.data[this.i] == '/') this.i++;
this.start = this.i + 1;
this.state = this.Text;
}
// 移除标签
remove(node) {
var name = node.name,
j = this.i;
while (1) {
if ((this.i = this.data.indexOf('</', this.i + 1)) == -1) {
if (name == 'pre' || name == 'svg') this.i = j;
else this.i = this.data.length;
return;
}
this.start = (this.i += 2);
while (!blankChar[this.data[this.i]] && !this.isClose()) this.i++;
if (this.getName(this.section()) == name) {
// 代码块高亮
if (name == 'pre') {
this.data = this.data.substr(0, j + 1) + cfg.highlight(this.data.substring(j + 1, this.i - 5), node.attrs) +
this.data.substr(this.i - 5);
return this.i = j;
} else if (name == 'style')
this.CssHandler.getStyle(this.data.substring(j + 1, this.i - 7));
else if (name == 'title')
this.title = this.data.substring(j + 1, this.i - 7);
if ((this.i = this.data.indexOf('>', this.i)) == -1) this.i = this.data.length;
// 处理 svg
if (name == 'svg') {
var src = this.data.substring(j, this.i + 1);
if (!node.attrs.xmlns) src = ' xmlns="http://www.w3.org/2000/svg"' + src;
var i = j;
while (this.data[j] != '<') j--;
src = this.data.substring(j, i) + src;
var parent = this.STACK[this.STACK.length - 1];
if (node.attrs.width == '100%' && parent && (parent.attrs.style || '').includes('inline'))
parent.attrs.style = 'width:300px;max-width:100%;' + parent.attrs.style;
this.siblings().push({
name: 'img',
attrs: {
src: 'data:image/svg+xml;utf8,' + src.replace(/#/g, '%23'),
ignore: 'T'
}
})
}
return;
}
}
}
// 处理属性
matchAttr(node) {
var attrs = node.attrs,
style = this.CssHandler.match(node.name, attrs, node) + (attrs.style || ''),
styleObj = {};
if (attrs.id) {
if (this.compress & 1) attrs.id = void 0;
else if (this.useAnchor) this.bubble();
}
if ((this.compress & 2) && attrs.class) attrs.class = void 0;
switch (node.name) {
case 'img':
if (attrs['data-src']) {
attrs.src = attrs.src || attrs['data-src'];
attrs['data-src'] = void 0;
}
if (attrs.src && !attrs.ignore) {
if (this.bubble()) attrs.i = (this.imgNum++).toString();
else attrs.ignore = 'T';
}
break;
case 'a':
case 'ad':
// #ifdef APP-PLUS
case 'iframe':
case 'embed':
// #endif
this.bubble();
break;
case 'font':
if (attrs.color) {
styleObj['color'] = attrs.color;
attrs.color = void 0;
}
if (attrs.face) {
styleObj['font-family'] = attrs.face;
attrs.face = void 0;
}
if (attrs.size) {
var size = parseInt(attrs.size);
if (size < 1) size = 1;
else if (size > 7) size = 7;
var map = ['xx-small', 'x-small', 'small', 'medium', 'large', 'x-large', 'xx-large'];
styleObj['font-size'] = map[size - 1];
attrs.size = void 0;
}
break;
case 'video':
case 'audio':
if (!attrs.id) attrs.id = node.name + (++this[`${node.name}Num`]);
else this[`${node.name}Num`]++;
if (node.name == 'video') {
if (attrs.width) {
style = `width:${parseFloat(attrs.width) + (attrs.width.includes('%') ? '%' : 'px')};${style}`;
attrs.width = void 0;
}
if (attrs.height) {
style = `height:${parseFloat(attrs.height) + (attrs.height.includes('%') ? '%' : 'px')};${style}`;
attrs.height = void 0;
}
if (this.videoNum > 3) node.lazyLoad = true;
}
attrs.source = [];
if (attrs.src) attrs.source.push(attrs.src);
if (!attrs.controls && !attrs.autoplay)
console.warn(`存在没有 controls 属性的 ${node.name} 标签,可能导致无法播放`, node);
this.bubble();
break;
case 'td':
case 'th':
if (attrs.colspan || attrs.rowspan)
for (var k = this.STACK.length, item; item = this.STACK[--k];)
if (item.name == 'table') {
item.c = void 0;
break;
}
}
if (attrs.align) {
styleObj['text-align'] = attrs.align;
attrs.align = void 0;
}
// 压缩 style
var styles = style.replace(/&quot;/g, '"').replace(/&amp;/g, '&').split(';');
style = '';
for (var i = 0, len = styles.length; i < len; i++) {
var info = styles[i].split(':');
if (info.length < 2) continue;
let key = info[0].trim().toLowerCase(),
value = info.slice(1).join(':').trim();
if (value.includes('-webkit') || value.includes('-moz') || value.includes('-ms') || value.includes('-o') || value
.includes(
'safe'))
style += `;${key}:${value}`;
else if (!styleObj[key] || value.includes('import') || !styleObj[key].includes('import'))
styleObj[key] = value;
}
if (node.name == 'img' && parseInt(styleObj.width || attrs.width) > screenWidth)
styleObj.height = 'auto';
for (var key in styleObj) {
var value = styleObj[key];
if (key.includes('flex') || key == 'order' || key == 'self-align') node.c = 1;
// 填充链接
if (value.includes('url')) {
var j = value.indexOf('(');
if (j++ != -1) {
while (value[j] == '"' || value[j] == "'" || blankChar[value[j]]) j++;
value = value.substr(0, j) + this.getUrl(value.substr(j));
}
}
// 转换 rpx
else if (value.includes('rpx'))
value = value.replace(/[0-9.]+\s*rpx/g, $ => parseFloat($) * screenWidth / 750 + 'px');
else if (key == 'white-space' && value.includes('pre'))
this.pre = node.pre = true;
style += `;${key}:${value}`;
}
style = style.substr(1);
if (style) attrs.style = style;
}
// 节点出栈处理
popNode(node) {
// 空白符处理
if (node.pre) {
node.pre = this.pre = void 0;
for (let i = this.STACK.length; i--;)
if (this.STACK[i].pre)
this.pre = true;
}
if (node.name == 'head' || (cfg.filter && cfg.filter(node, this) == false))
return this.siblings().pop();
var attrs = node.attrs;
// 替换一些标签名
if (node.name == 'picture') {
node.name = 'img';
if (!attrs.src && (node.children[0] || '').name == 'img')
attrs.src = node.children[0].attrs.src;
if (attrs.src && !attrs.ignore)
attrs.i = (this.imgNum++).toString();
return node.children = void 0;
}
if (cfg.blockTags[node.name]) node.name = 'div';
else if (!cfg.trustTags[node.name]) node.name = 'span';
// 处理列表
if (node.c) {
if (node.name == 'ul') {
var floor = 1;
for (let i = this.STACK.length; i--;)
if (this.STACK[i].name == 'ul') floor++;
if (floor != 1)
for (let i = node.children.length; i--;)
node.children[i].floor = floor;
} else if (node.name == 'ol') {
for (let i = 0, num = 1, child; child = node.children[i++];)
if (child.name == 'li') {
child.type = 'ol';
child.num = ((num, type) => {
if (type == 'a') return String.fromCharCode(97 + (num - 1) % 26);
if (type == 'A') return String.fromCharCode(65 + (num - 1) % 26);
if (type == 'i' || type == 'I') {
num = (num - 1) % 99 + 1;
var one = ['I', 'II', 'III', 'IV', 'V', 'VI', 'VII', 'VIII', 'IX'],
ten = ['X', 'XX', 'XXX', 'XL', 'L', 'LX', 'LXX', 'LXXX', 'XC'],
res = (ten[Math.floor(num / 10) - 1] || '') + (one[num % 10 - 1] || '');
if (type == 'i') return res.toLowerCase();
return res;
}
return num;
})(num++, attrs.type) + '.';
}
}
}
// 处理表格的边框
if (node.name == 'table') {
var padding = attrs.cellpadding,
spacing = attrs.cellspacing,
border = attrs.border;
if (node.c) {
this.bubble();
if (!padding) padding = 2;
if (!spacing) spacing = 2;
}
if (border) attrs.style = `border:${border}px solid gray;${attrs.style || ''}`;
if (spacing) attrs.style = `border-spacing:${spacing}px;${attrs.style || ''}`;
if (border || padding)
(function f(ns) {
for (var i = 0, n; n = ns[i]; i++) {
if (n.name == 'th' || n.name == 'td') {
if (border) n.attrs.style = `border:${border}px solid gray;${n.attrs.style}`;
if (padding) n.attrs.style = `padding:${padding}px;${n.attrs.style}`;
} else f(n.children || []);
}
})(node.children)
}
this.CssHandler.pop && this.CssHandler.pop(node);
// 自动压缩
if (node.name == 'div' && !Object.keys(attrs).length) {
var siblings = this.siblings();
if (node.children.length == 1 && node.children[0].name == 'div')
siblings[siblings.length - 1] = node.children[0];
}
}
// 工具函数
bubble() {
for (var i = this.STACK.length, item; item = this.STACK[--i];) {
if (cfg.richOnlyTags[item.name]) {
if (item.name == 'table' && !Object.hasOwnProperty.call(item, 'c')) item.c = 1;
return false;
}
item.c = 1;
}
return true;
}
getName = val => this.xml ? val : val.toLowerCase();
getUrl(url) {
if (url[0] == '/') {
if (url[1] == '/') url = this.protocol + ':' + url;
else if (this.domain) url = this.domain + url;
} else if (this.domain && url.indexOf('data:') != 0 && !url.includes('://'))
url = this.domain + '/' + url;
return url;
}
isClose = () => this.data[this.i] == '>' || (this.data[this.i] == '/' && this.data[this.i + 1] == '>');
section = () => this.data.substring(this.start, this.i);
siblings = () => this.STACK.length ? this.STACK[this.STACK.length - 1].children : this.DOM;
// 状态机
Text(c) {
if (c == '<') {
var next = this.data[this.i + 1],
isLetter = c => (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z');
if (isLetter(next)) {
this.setText();
this.start = this.i + 1;
this.state = this.TagName;
} else if (next == '/') {
this.setText();
if (isLetter(this.data[++this.i + 1])) {
this.start = this.i + 1;
this.state = this.EndTag;
} else
this.Comment();
} else if (next == '!') {
this.setText();
this.Comment();
}
}
}
Comment() {
var key;
if (this.data.substring(this.i + 2, this.i + 4) == '--') key = '-->';
else if (this.data.substring(this.i + 2, this.i + 9) == '[CDATA[') key = ']]>';
else key = '>';
if ((this.i = this.data.indexOf(key, this.i + 2)) == -1) this.i = this.data.length;
else this.i += key.length - 1;
this.start = this.i + 1;
this.state = this.Text;
}
TagName(c) {
if (blankChar[c]) {
this.tagName = this.section();
while (blankChar[this.data[this.i]]) this.i++;
if (this.isClose()) this.setNode();
else {
this.start = this.i;
this.state = this.AttrName;
}
} else if (this.isClose()) {
this.tagName = this.section();
this.setNode();
}
}
AttrName(c) {
var blank = blankChar[c];
if (blank) {
this.attrName = this.section();
c = this.data[this.i];
}
if (c == '=') {
if (!blank) this.attrName = this.section();
while (blankChar[this.data[++this.i]]);
this.start = this.i--;
this.state = this.AttrValue;
} else if (blank) this.setAttr();
else if (this.isClose()) {
this.attrName = this.section();
this.setAttr();
}
}
AttrValue(c) {
if (c == '"' || c == "'") {
this.start++;
if ((this.i = this.data.indexOf(c, this.i + 1)) == -1) return this.i = this.data.length;
this.attrVal = this.section();
this.i++;
} else {
for (; !blankChar[this.data[this.i]] && !this.isClose(); this.i++);
this.attrVal = this.section();
}
this.setAttr();
}
EndTag(c) {
if (blankChar[c] || c == '>' || c == '/') {
var name = this.getName(this.section());
for (var i = this.STACK.length; i--;)
if (this.STACK[i].name == name) break;
if (i != -1) {
var node;
while ((node = this.STACK.pop()).name != name);
this.popNode(node);
} else if (name == 'p' || name == 'br')
this.siblings().push({
name,
attrs: {}
});
this.i = this.data.indexOf('>', this.i);
this.start = this.i + 1;
if (this.i == -1) this.i = this.data.length;
else this.state = this.Text;
}
}
}
module.exports = MpHtmlParser;