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115 lines
2.7 KiB
115 lines
2.7 KiB
/* @flow */
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const validDivisionCharRE = /[\w).+\-_$\]]/
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module.exports = function parseFilters (exp) {
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let inSingle = false
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let inDouble = false
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let inTemplateString = false
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let inRegex = false
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let curly = 0
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let square = 0
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let paren = 0
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let lastFilterIndex = 0
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let c, prev, i, expression, filters
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for (i = 0; i < exp.length; i++) {
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prev = c
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c = exp.charCodeAt(i)
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if (inSingle) {
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if (c === 0x27 && prev !== 0x5C) inSingle = false
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} else if (inDouble) {
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if (c === 0x22 && prev !== 0x5C) inDouble = false
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} else if (inTemplateString) {
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if (c === 0x60 && prev !== 0x5C) inTemplateString = false
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} else if (inRegex) {
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if (c === 0x2f && prev !== 0x5C) inRegex = false
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} else if (
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c === 0x7C && // pipe
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exp.charCodeAt(i + 1) !== 0x7C &&
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exp.charCodeAt(i - 1) !== 0x7C &&
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!curly && !square && !paren
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) {
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if (expression === undefined) {
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// first filter, end of expression
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lastFilterIndex = i + 1
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expression = exp.slice(0, i).trim()
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} else {
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pushFilter()
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}
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} else {
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switch (c) {
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case 0x22:
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inDouble = true
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break // "
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case 0x27:
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inSingle = true
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break // '
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case 0x60:
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inTemplateString = true
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break // `
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case 0x28:
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paren++
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break // (
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case 0x29:
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paren--
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break // )
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case 0x5B:
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square++
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break // [
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case 0x5D:
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square--
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break // ]
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case 0x7B:
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curly++
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break // {
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case 0x7D:
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curly--
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break // }
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}
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if (c === 0x2f) { // /
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let j = i - 1
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let p
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// find first non-whitespace prev char
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for (; j >= 0; j--) {
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p = exp.charAt(j)
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if (p !== ' ') break
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}
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if (!p || !validDivisionCharRE.test(p)) {
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inRegex = true
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}
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}
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}
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}
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if (expression === undefined) {
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expression = exp.slice(0, i).trim()
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} else if (lastFilterIndex !== 0) {
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pushFilter()
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}
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function pushFilter () {
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(filters || (filters = [])).push(exp.slice(lastFilterIndex, i).trim())
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lastFilterIndex = i + 1
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}
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if (filters) {
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for (i = 0; i < filters.length; i++) {
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expression = wrapFilter(expression, filters[i])
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}
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}
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return expression
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}
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function wrapFilter (exp, filter) {
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const i = filter.indexOf('(')
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if (i < 0) {
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// _f: resolveFilter
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return `_f("${filter}")(${exp})`
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} else {
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const name = filter.slice(0, i)
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const args = filter.slice(i + 1)
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return `_f("${name}")(${exp}${args !== ')' ? ',' + args : args}`
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}
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}
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