YingXingAI/node_modules/mp-html/plugins/latex/index.js

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/**
* @fileoverview latex 插件
* katex.min.js来源 https://github.com/rojer95/katex-mini
*/
const parse = require('./katex.min')
function Latex () {
}
Latex.prototype.onParse = function (node, vm) {
// $...$包裹的内容为latex公式
if (!vm.options.editable && node.type === 'text' && node.text.includes('$')) {
const part = node.text.split(/(\${1,2})/)
const children = []
let status = 0
for (let i = 0; i < part.length; i++) {
if (i % 2 === 0) {
// 文本内容
if (part[i]) {
if (status === 0) {
children.push({
type: 'text',
text: part[i]
})
} else {
if (status === 1) {
// 行内公式
const nodes = parse.default(part[i])
children.push({
name: 'span',
attrs: {},
l: 'T',
f: 'display:inline-block',
children: nodes
})
} else {
// 块公式
const nodes = parse.default(part[i], {
displayMode: true
})
children.push({
name: 'div',
attrs: {
style: 'text-align:center'
},
children: nodes
})
}
}
}
} else {
// 分隔符
if (part[i] === '$' && part[i + 2] === '$') {
// 行内公式
status = 1
part[i + 2] = ''
} else if (part[i] === '$$' && part[i + 2] === '$$') {
// 块公式
status = 2
part[i + 2] = ''
} else {
if (part[i] && part[i] !== '$$') {
// 普通$符号
part[i + 1] = part[i] + part[i + 1]
}
// 重置状态
status = 0
}
}
}
delete node.type
delete node.text
node.name = 'span'
node.attrs = {}
node.children = children
}
}
module.exports = Latex