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/* @flow */
import deindent from 'de-indent'
import { parseHTML } from 'compiler/parser/html-parser'
import { makeMap } from 'shared/util'
const splitRE = /\r?\n/g
const replaceRE = /./g
const isSpecialTag = makeMap('script,style,template', true)
type Attribute = {
name: string,
value: string
};
/**
* Parse a single-file component (*.vue) file into an SFC Descriptor Object.
*/
export function parseComponent (
content: string,
options?: Object = {}
): SFCDescriptor {
const sfc: SFCDescriptor = {
template: null,
script: null,
styles: [],
customBlocks: []
}
let depth = 0
let currentBlock: ?SFCBlock = null
function start (
tag: string,
attrs: Array<Attribute>,
unary: boolean,
start: number,
end: number
) {
if (depth === 0) {
currentBlock = {
type: tag,
content: '',
start: end,
attrs: attrs.reduce((cumulated, { name, value }) => {
cumulated[name] = value || true
return cumulated
}, {})
}
if (isSpecialTag(tag)) {
checkAttrs(currentBlock, attrs)
if (tag === 'style') {
sfc.styles.push(currentBlock)
} else {
sfc[tag] = currentBlock
}
} else { // custom blocks
sfc.customBlocks.push(currentBlock)
}
}
if (!unary) {
depth++
}
}
function checkAttrs (block: SFCBlock, attrs: Array<Attribute>) {
for (let i = 0; i < attrs.length; i++) {
const attr = attrs[i]
if (attr.name === 'lang') {
block.lang = attr.value
}
if (attr.name === 'scoped') {
block.scoped = true
}
if (attr.name === 'module') {
block.module = attr.value || true
}
if (attr.name === 'src') {
block.src = attr.value
}
}
}
function end (tag: string, start: number, end: number) {
if (depth === 1 && currentBlock) {
currentBlock.end = start
let text = deindent(content.slice(currentBlock.start, currentBlock.end))
// pad content so that linters and pre-processors can output correct
// line numbers in errors and warnings
if (currentBlock.type !== 'template' && options.pad) {
text = padContent(currentBlock, options.pad) + text
}
currentBlock.content = text
currentBlock = null
}
depth--
}
function padContent (block: SFCBlock, pad: true | "line" | "space") {
if (pad === 'space') {
return content.slice(0, block.start).replace(replaceRE, ' ')
} else {
const offset = content.slice(0, block.start).split(splitRE).length
const padChar = block.type === 'script' && !block.lang
? '//\n'
: '\n'
return Array(offset).join(padChar)
}
}
parseHTML(content, {
start,
end
})
return sfc
}
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