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/* @flow */
import { cached } from 'shared/util'
import { parseFilters } from './filter-parser'
const defaultTagRE = /\{\{((?:.|\r?\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')
})
type TextParseResult = {
expression: string,
tokens: Array<string | { '@binding': string }>
}
export function parseText (
text: string,
delimiters?: [string, string]
): TextParseResult | void {
const tagRE = delimiters ? buildRegex(delimiters) : defaultTagRE
if (!tagRE.test(text)) {
return
}
const tokens = []
const rawTokens = []
let lastIndex = tagRE.lastIndex = 0
let match, index, tokenValue
while ((match = tagRE.exec(text))) {
index = match.index
// push text token
if (index > lastIndex) {
rawTokens.push(tokenValue = text.slice(lastIndex, index))
tokens.push(JSON.stringify(tokenValue))
}
// tag token
const exp = parseFilters(match[1].trim())
tokens.push(`_s(${exp})`)
rawTokens.push({ '@binding': exp })
lastIndex = index + match[0].length
}
if (lastIndex < text.length) {
rawTokens.push(tokenValue = text.slice(lastIndex))
tokens.push(JSON.stringify(tokenValue))
}
return {
expression: tokens.join('+'),
tokens: rawTokens
}
}