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"use strict"
// builtin tooling
const path = require("path")
// internal tooling
const joinMedia = require("./lib/join-media")
const joinLayer = require("./lib/join-layer")
const resolveId = require("./lib/resolve-id")
const loadContent = require("./lib/load-content")
const processContent = require("./lib/process-content")
const parseStatements = require("./lib/parse-statements")
const assignLayerNames = require("./lib/assign-layer-names")
const dataURL = require("./lib/data-url")
function AtImport(options) {
options = {
root: process.cwd(),
path: [],
skipDuplicates: true,
resolve: resolveId,
load: loadContent,
plugins: [],
addModulesDirectories: [],
nameLayer: null,
...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 {
postcssPlugin: "postcss-import",
Once(styles, { result, atRule, postcss }) {
const state = {
importedFiles: {},
hashFiles: {},
rootFilename: null,
anonymousLayerCounter: 0,
}
if (styles.source?.input?.file) {
state.rootFilename = 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")
}
if (options.nameLayer && typeof options.nameLayer !== "function") {
throw new Error("nameLayer option must be a function")
}
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
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 && !stmt.layer.length) ||
stmt.type === "charset"
) {
return
}
if (stmt.layer.length > 1) {
assignLayerNames(stmt.layer, stmt.node, state, options)
}
if (stmt.type === "import") {
const parts = [stmt.fullUri]
const media = stmt.media.join(", ")
if (stmt.layer.length) {
const layerName = stmt.layer.join(".")
let layerParams = "layer"
if (layerName) {
layerParams = `layer(${layerName})`
}
parts.push(layerParams)
}
if (media) {
parts.push(media)
}
stmt.node.params = parts.join(" ")
} else if (stmt.type === "media") {
if (stmt.layer.length) {
const layerNode = atRule({
name: "layer",
params: stmt.layer.join("."),
source: stmt.node.source,
})
if (stmt.parentMedia?.length) {
const mediaNode = atRule({
name: "media",
params: stmt.parentMedia.join(", "),
source: stmt.node.source,
})
mediaNode.append(layerNode)
layerNode.append(stmt.node)
stmt.node = mediaNode
} else {
layerNode.append(stmt.node)
stmt.node = layerNode
}
} else {
stmt.node.params = stmt.media.join(", ")
}
} else {
const { nodes } = stmt
const { parent } = nodes[0]
let outerAtRule
let innerAtRule
if (stmt.media.length && stmt.layer.length) {
const mediaNode = atRule({
name: "media",
params: stmt.media.join(", "),
source: parent.source,
})
const layerNode = atRule({
name: "layer",
params: stmt.layer.join("."),
source: parent.source,
})
mediaNode.append(layerNode)
innerAtRule = layerNode
outerAtRule = mediaNode
} else if (stmt.media.length) {
const mediaNode = atRule({
name: "media",
params: stmt.media.join(", "),
source: parent.source,
})
innerAtRule = mediaNode
outerAtRule = mediaNode
} else if (stmt.layer.length) {
const layerNode = atRule({
name: "layer",
params: stmt.layer.join("."),
source: parent.source,
})
innerAtRule = layerNode
outerAtRule = layerNode
}
parent.insertBefore(nodes[0], outerAtRule)
// 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 and/or layer at rule
innerAtRule.append(nodes)
stmt.type = "media"
stmt.node = outerAtRule
delete stmt.nodes
}
})
}
function applyStyles(bundle, styles) {
styles.nodes = []
// Strip additional statements.
bundle.forEach(stmt => {
if (["charset", "import", "media"].includes(stmt.type)) {
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, layer) {
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 || [])
stmt.parentMedia = media
stmt.layer = joinLayer(layer, stmt.layer || [])
// 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(() => {
let charset
const imports = []
const bundle = []
function handleCharset(stmt) {
if (!charset) charset = stmt
// charsets aren't case-sensitive, so convert to lower case to compare
else if (
stmt.node.params.toLowerCase() !==
charset.node.params.toLowerCase()
) {
throw new Error(
`Incompatable @charset statements:
${stmt.node.params} specified in ${stmt.node.source.input.file}
${charset.node.params} specified in ${charset.node.source.input.file}`
)
}
}
// squash statements and their children
statements.forEach(stmt => {
if (stmt.type === "charset") handleCharset(stmt)
else if (stmt.type === "import") {
if (stmt.children) {
stmt.children.forEach((child, index) => {
if (child.type === "import") imports.push(child)
else if (child.type === "charset") handleCharset(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 charset
? [charset, ...imports.concat(bundle)]
: imports.concat(bundle)
})
}
function resolveImportId(result, stmt, options, state) {
if (dataURL.isValid(stmt.uri)) {
return loadImportContent(result, stmt, stmt.uri, options, state).then(
result => {
stmt.children = result
}
)
}
const atRule = stmt.node
let sourceFile
if (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",
plugin: "postcss-import",
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, layer } = stmt
assignLayerNames(layer, atRule, state, options)
if (options.skipDuplicates) {
// skip files already imported at the same scope
if (state.importedFiles[filename]?.[media]?.[layer]) {
return
}
// save imported files to skip them next time
if (!state.importedFiles[filename]) {
state.importedFiles[filename] = {}
}
if (!state.importedFiles[filename][media]) {
state.importedFiles[filename][media] = {}
}
state.importedFiles[filename][media][layer] = 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]?.[media]?.[layer]) {
return
}
return processContent(
result,
content,
filename,
options,
postcss
).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] = {}
}
if (!state.hashFiles[content][media]) {
state.hashFiles[content][media] = {}
}
state.hashFiles[content][media][layer] = true
}
}
// recursion: import @import from imported file
return parseStyles(result, styles, options, state, media, layer)
})
}
)
}
},
}
}
AtImport.postcss = true
module.exports = AtImport