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