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/* @flow */
/**
* Cross-platform code generation for component v-model
*/
export function genComponentModel (
el: ASTElement,
value: string,
modifiers: ?ASTModifiers
): ?boolean {
const { number, trim } = modifiers || {}
const baseValueExpression = '$$v'
let valueExpression = baseValueExpression
if (trim) {
valueExpression =
`(typeof ${baseValueExpression} === 'string'` +
`? ${baseValueExpression}.trim()` +
`: ${baseValueExpression})`
}
if (number) {
valueExpression = `_n(${valueExpression})`
}
const assignment = genAssignmentCode(value, valueExpression)
el.model = {
value: `(${value})`,
expression: JSON.stringify(value),
callback: `function (${baseValueExpression}) {${assignment}}`
}
}
/**
* Cross-platform codegen helper for generating v-model value assignment code.
*/
export function genAssignmentCode (
value: string,
assignment: string
): string {
const res = parseModel(value)
if (res.key === null) {
return `${value}=${assignment}`
} else {
return `$set(${res.exp}, ${res.key}, ${assignment})`
}
}
/**
* Parse a v-model expression into a base path and a final key segment.
* Handles both dot-path and possible square brackets.
*
* Possible cases:
*
* - test
* - test[key]
* - test[test1[key]]
* - test["a"][key]
* - xxx.test[a[a].test1[key]]
* - test.xxx.a["asa"][test1[key]]
*
*/
let len, str, chr, index, expressionPos, expressionEndPos
type ModelParseResult = {
exp: string,
key: string | null
}
export function parseModel (val: string): ModelParseResult {
// Fix https://github.com/vuejs/vue/pull/7730
// allow v-model="obj.val " (trailing whitespace)
val = val.trim()
len = val.length
if (val.indexOf('[') < 0 || val.lastIndexOf(']') < len - 1) {
index = val.lastIndexOf('.')
if (index > -1) {
return {
exp: val.slice(0, index),
key: '"' + val.slice(index + 1) + '"'
}
} else {
return {
exp: val,
key: null
}
}
}
str = val
index = expressionPos = expressionEndPos = 0
while (!eof()) {
chr = next()
/* istanbul ignore if */
if (isStringStart(chr)) {
parseString(chr)
} else if (chr === 0x5B) {
parseBracket(chr)
}
}
return {
exp: val.slice(0, expressionPos),
key: val.slice(expressionPos + 1, expressionEndPos)
}
}
function next (): number {
return str.charCodeAt(++index)
}
function eof (): boolean {
return index >= len
}
function isStringStart (chr: number): boolean {
return chr === 0x22 || chr === 0x27
}
function parseBracket (chr: number): void {
let inBracket = 1
expressionPos = index
while (!eof()) {
chr = next()
if (isStringStart(chr)) {
parseString(chr)
continue
}
if (chr === 0x5B) inBracket++
if (chr === 0x5D) inBracket--
if (inBracket === 0) {
expressionEndPos = index
break
}
}
}
function parseString (chr: number): void {
const stringQuote = chr
while (!eof()) {
chr = next()
if (chr === stringQuote) {
break
}
}
}