aaac7fed
 liuqimichale
add
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"use strict"
// builtin tooling
const path = require("path")
// external tooling
const postcss = require("postcss")
// internal tooling
const joinMedia = require("./lib/join-media")
const resolveId = require("./lib/resolve-id")
const loadContent = require("./lib/load-content")
const processContent = require("./lib/process-content")
const parseStatements = require("./lib/parse-statements")
function AtImport(options) {
options = Object.assign(
{
root: process.cwd(),
path: [],
skipDuplicates: true,
resolve: resolveId,
load: loadContent,
plugins: [],
addModulesDirectories: [],
},
options
)
options.root = path.resolve(options.root)
// convert string to an array of a single element
if (typeof options.path === "string") options.path = [options.path]
if (!Array.isArray(options.path)) options.path = []
options.path = options.path.map(p => path.resolve(options.root, p))
return function(styles, result) {
const state = {
importedFiles: {},
hashFiles: {},
}
if (styles.source && styles.source.input && styles.source.input.file) {
state.importedFiles[styles.source.input.file] = {}
}
if (options.plugins && !Array.isArray(options.plugins)) {
throw new Error("plugins option must be an array")
}
return parseStyles(result, styles, options, state, []).then(bundle => {
applyRaws(bundle)
applyMedia(bundle)
applyStyles(bundle, styles)
})
}
}
function applyRaws(bundle) {
bundle.forEach((stmt, index) => {
if (index === 0) return
if (stmt.parent) {
const before = stmt.parent.node.raws.before
if (stmt.type === "nodes") stmt.nodes[0].raws.before = before
else stmt.node.raws.before = before
} else if (stmt.type === "nodes") {
stmt.nodes[0].raws.before = stmt.nodes[0].raws.before || "\n"
}
})
}
function applyMedia(bundle) {
bundle.forEach(stmt => {
if (!stmt.media.length) return
if (stmt.type === "import") {
stmt.node.params = `${stmt.fullUri} ${stmt.media.join(", ")}`
} else if (stmt.type === "media") stmt.node.params = stmt.media.join(", ")
else {
const nodes = stmt.nodes
const parent = nodes[0].parent
const mediaNode = postcss.atRule({
name: "media",
params: stmt.media.join(", "),
source: parent.source,
})
parent.insertBefore(nodes[0], mediaNode)
// remove nodes
nodes.forEach(node => {
node.parent = undefined
})
// better output
nodes[0].raws.before = nodes[0].raws.before || "\n"
// wrap new rules with media query
mediaNode.append(nodes)
stmt.type = "media"
stmt.node = mediaNode
delete stmt.nodes
}
})
}
function applyStyles(bundle, styles) {
styles.nodes = []
// Strip additional statements.
bundle.forEach(stmt => {
if (stmt.type === "import") {
stmt.node.parent = undefined
styles.append(stmt.node)
} else if (stmt.type === "media") {
stmt.node.parent = undefined
styles.append(stmt.node)
} else if (stmt.type === "nodes") {
stmt.nodes.forEach(node => {
node.parent = undefined
styles.append(node)
})
}
})
}
function parseStyles(result, styles, options, state, media) {
const statements = parseStatements(result, styles)
return Promise.resolve(statements)
.then(stmts => {
// process each statement in series
return stmts.reduce((promise, stmt) => {
return promise.then(() => {
stmt.media = joinMedia(media, stmt.media || [])
// skip protocol base uri (protocol://url) or protocol-relative
if (stmt.type !== "import" || /^(?:[a-z]+:)?\/\//i.test(stmt.uri)) {
return
}
if (options.filter && !options.filter(stmt.uri)) {
// rejected by filter
return
}
return resolveImportId(result, stmt, options, state)
})
}, Promise.resolve())
})
.then(() => {
const imports = []
const bundle = []
// squash statements and their children
statements.forEach(stmt => {
if (stmt.type === "import") {
if (stmt.children) {
stmt.children.forEach((child, index) => {
if (child.type === "import") imports.push(child)
else bundle.push(child)
// For better output
if (index === 0) child.parent = stmt
})
} else imports.push(stmt)
} else if (stmt.type === "media" || stmt.type === "nodes") {
bundle.push(stmt)
}
})
return imports.concat(bundle)
})
}
function resolveImportId(result, stmt, options, state) {
const atRule = stmt.node
let sourceFile
if (atRule.source && atRule.source.input && atRule.source.input.file) {
sourceFile = atRule.source.input.file
}
const base = sourceFile
? path.dirname(atRule.source.input.file)
: options.root
return Promise.resolve(options.resolve(stmt.uri, base, options))
.then(paths => {
if (!Array.isArray(paths)) paths = [paths]
// Ensure that each path is absolute:
return Promise.all(
paths.map(file => {
return !path.isAbsolute(file) ? resolveId(file, base, options) : file
})
)
})
.then(resolved => {
// Add dependency messages:
resolved.forEach(file => {
result.messages.push({
type: "dependency",
file: file,
parent: sourceFile,
})
})
return Promise.all(
resolved.map(file => {
return loadImportContent(result, stmt, file, options, state)
})
)
})
.then(result => {
// Merge loaded statements
stmt.children = result.reduce((result, statements) => {
return statements ? result.concat(statements) : result
}, [])
})
}
function loadImportContent(result, stmt, filename, options, state) {
const atRule = stmt.node
const media = stmt.media
if (options.skipDuplicates) {
// skip files already imported at the same scope
if (state.importedFiles[filename] && state.importedFiles[filename][media]) {
return
}
// save imported files to skip them next time
if (!state.importedFiles[filename]) state.importedFiles[filename] = {}
state.importedFiles[filename][media] = true
}
return Promise.resolve(options.load(filename, options)).then(content => {
if (content.trim() === "") {
result.warn(`${filename} is empty`, { node: atRule })
return
}
// skip previous imported files not containing @import rules
if (state.hashFiles[content] && state.hashFiles[content][media]) return
return processContent(result, content, filename, options).then(
importedResult => {
const styles = importedResult.root
result.messages = result.messages.concat(importedResult.messages)
if (options.skipDuplicates) {
const hasImport = styles.some(child => {
return child.type === "atrule" && child.name === "import"
})
if (!hasImport) {
// save hash files to skip them next time
if (!state.hashFiles[content]) state.hashFiles[content] = {}
state.hashFiles[content][media] = true
}
}
// recursion: import @import from imported file
return parseStyles(result, styles, options, state, media)
}
)
})
}
module.exports = postcss.plugin("postcss-import", AtImport)
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