text-parser.js
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/* @flow */
import { cached } from 'shared/util'
import { parseFilters } from './filter-parser'
const defaultTagRE = /\{\{((?:.|\n)+?)\}\}/g
const regexEscapeRE = /[-.*+?^${}()|[\]\/\\]/g
const buildRegex = cached(delimiters => {
const open = delimiters[0].replace(regexEscapeRE, '\\$&')
const close = delimiters[1].replace(regexEscapeRE, '\\$&')
return new RegExp(open + '((?:.|\\n)+?)' + close, 'g')
})
export function parseText (
text: string,
delimiters?: [string, string]
): string | void {
const tagRE = delimiters ? buildRegex(delimiters) : defaultTagRE
if (!tagRE.test(text)) {
return
}
const tokens = []
let lastIndex = tagRE.lastIndex = 0
let match, index
while ((match = tagRE.exec(text))) {
index = match.index
// push text token
if (index > lastIndex) {
tokens.push(JSON.stringify(text.slice(lastIndex, index)))
}
// tag token
const exp = parseFilters(match[1].trim())
tokens.push(`_s(${exp})`)
lastIndex = index + match[0].length
}
if (lastIndex < text.length) {
tokens.push(JSON.stringify(text.slice(lastIndex)))
}
return tokens.join('+')
}