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