ce4c83ff
 wxy
初始提交
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"use strict"
const htmlparser = require("htmlparser2")
const TransformableString = require("./TransformableString")
function iterateScripts(code, options, onChunk) {
if (!code) return
const xmlMode = options.xmlMode
const isJavaScriptMIMEType = options.isJavaScriptMIMEType || (() => true)
let index = 0
let inScript = false
let cdata = []
const chunks = []
function pushChunk(type, end) {
chunks.push({ type, start: index, end, cdata })
cdata = []
index = end
}
const parser = new htmlparser.Parser(
{
onopentag(name, attrs) {
// Test if current tag is a valid <script> tag.
if (name !== "script") {
return
}
if (attrs.type && !isJavaScriptMIMEType(attrs.type)) {
return
}
if (attrs.src) {
return
}
inScript = true
pushChunk("html", parser.endIndex + 1)
},
oncdatastart() {
cdata.push(
{
start: parser.startIndex,
end: parser.startIndex + 9,
},
{
start: parser.endIndex - 2,
end: parser.endIndex + 1,
}
)
},
onclosetag(name) {
if (name !== "script" || !inScript) {
return
}
inScript = false
if (parser.startIndex < chunks[chunks.length - 1].end) {
// The parser didn't move its index after the previous chunk emited. It occurs on
// self-closing tags (xml mode). Just ignore this script.
return
}
pushChunk("script", parser.startIndex)
},
ontext() {
if (!inScript) {
return
}
pushChunk("script", parser.endIndex + 1)
},
},
{
xmlMode: xmlMode === true,
}
)
parser.parseComplete(code)
pushChunk("html", parser.endIndex + 1)
{
const emitChunk = () => {
const cdata = []
for (let i = startChunkIndex; i < index; i += 1) {
cdata.push.apply(cdata, chunks[i].cdata)
}
onChunk({
type: chunks[startChunkIndex].type,
start: chunks[startChunkIndex].start,
end: chunks[index - 1].end,
cdata,
})
}
let startChunkIndex = 0
let index
for (index = 1; index < chunks.length; index += 1) {
if (chunks[startChunkIndex].type === chunks[index].type) continue
emitChunk()
startChunkIndex = index
}
emitChunk()
}
}
function computeIndent(descriptor, previousHTML, slice) {
if (!descriptor) {
const indentMatch = /[\n\r]+([ \t]*)/.exec(slice)
return indentMatch ? indentMatch[1] : ""
}
if (descriptor.relative) {
return previousHTML.match(/([^\n\r]*)<[^<]*$/)[1] + descriptor.spaces
}
return descriptor.spaces
}
function* dedent(indent, slice) {
let hadNonEmptyLine = false
const re = /(\r\n|\n|\r)([ \t]*)(.*)/g
let lastIndex = 0
while (true) {
const match = re.exec(slice)
if (!match) break
const newLine = match[1]
const lineIndent = match[2]
const lineText = match[3]
const isEmptyLine = !lineText
const isFirstNonEmptyLine = !isEmptyLine && !hadNonEmptyLine
const badIndentation =
// Be stricter on the first line
isFirstNonEmptyLine
? indent !== lineIndent
: lineIndent.indexOf(indent) !== 0
if (!badIndentation) {
lastIndex = match.index + newLine.length + indent.length
// Remove the first line if it is empty
const fromIndex = match.index === 0 ? 0 : match.index + newLine.length
yield {
type: "dedent",
from: fromIndex,
to: lastIndex,
}
} else if (isEmptyLine) {
yield {
type: "empty",
}
} else {
yield {
type: "bad-indent",
}
}
if (!isEmptyLine) {
hadNonEmptyLine = true
}
}
const endSpaces = slice.slice(lastIndex).match(/[ \t]*$/)[0].length
if (endSpaces) {
yield {
type: "dedent",
from: slice.length - endSpaces,
to: slice.length,
}
}
}
function extract(code, indentDescriptor, xmlMode, isJavaScriptMIMEType) {
const badIndentationLines = []
const codeParts = []
let lineNumber = 1
let previousHTML = ""
iterateScripts(code, { xmlMode, isJavaScriptMIMEType }, chunk => {
const slice = code.slice(chunk.start, chunk.end)
if (chunk.type === "html") {
const match = slice.match(/\r\n|\n|\r/g)
if (match) lineNumber += match.length
previousHTML = slice
} else if (chunk.type === "script") {
const transformedCode = new TransformableString(code)
let indentSlice = slice
for (const cdata of chunk.cdata) {
transformedCode.replace(cdata.start, cdata.end, "")
if (cdata.end === chunk.end) {
indentSlice = code.slice(chunk.start, cdata.start)
}
}
transformedCode.replace(0, chunk.start, "")
transformedCode.replace(chunk.end, code.length, "")
for (const action of dedent(
computeIndent(indentDescriptor, previousHTML, indentSlice),
indentSlice
)) {
lineNumber += 1
if (action.type === "dedent") {
transformedCode.replace(
chunk.start + action.from,
chunk.start + action.to,
""
)
} else if (action.type === "bad-indent") {
badIndentationLines.push(lineNumber)
}
}
codeParts.push(transformedCode)
}
})
return {
code: codeParts,
badIndentationLines,
}
}
module.exports = extract
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