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"use strict";
const selectorParser = require("postcss-selector-parser");
const hasOwnProperty = Object.prototype.hasOwnProperty;
function getSingleLocalNamesForComposes(root) {
return root.nodes.map((node) => {
if (node.type !== "selector" || node.nodes.length !== 1) {
throw new Error(
`composition is only allowed when selector is single :local class name not in "${root}"`
);
}
node = node.nodes[0];
if (
node.type !== "pseudo" ||
node.value !== ":local" ||
node.nodes.length !== 1
) {
throw new Error(
'composition is only allowed when selector is single :local class name not in "' +
root +
'", "' +
node +
'" is weird'
);
}
node = node.first;
if (node.type !== "selector" || node.length !== 1) {
throw new Error(
'composition is only allowed when selector is single :local class name not in "' +
root +
'", "' +
node +
'" is weird'
);
}
node = node.first;
if (node.type !== "class") {
// 'id' is not possible, because you can't compose ids
throw new Error(
'composition is only allowed when selector is single :local class name not in "' +
root +
'", "' +
node +
'" is weird'
);
}
return node.value;
});
}
const whitespace = "[\\x20\\t\\r\\n\\f]";
const unescapeRegExp = new RegExp(
"\\\\([\\da-f]{1,6}" + whitespace + "?|(" + whitespace + ")|.)",
"ig"
);
function unescape(str) {
return str.replace(unescapeRegExp, (_, escaped, escapedWhitespace) => {
const high = "0x" + escaped - 0x10000;
// NaN means non-codepoint
// Workaround erroneous numeric interpretation of +"0x"
return high !== high || escapedWhitespace
? escaped
: high < 0
? // BMP codepoint
String.fromCharCode(high + 0x10000)
: // Supplemental Plane codepoint (surrogate pair)
String.fromCharCode((high >> 10) | 0xd800, (high & 0x3ff) | 0xdc00);
});
}
const plugin = (options = {}) => {
const generateScopedName =
(options && options.generateScopedName) || plugin.generateScopedName;
const generateExportEntry =
(options && options.generateExportEntry) || plugin.generateExportEntry;
const exportGlobals = options && options.exportGlobals;
return {
postcssPlugin: "postcss-modules-scope",
Once(root, { rule }) {
const exports = Object.create(null);
function exportScopedName(name, rawName) {
const scopedName = generateScopedName(
rawName ? rawName : name,
root.source.input.from,
root.source.input.css
);
const exportEntry = generateExportEntry(
rawName ? rawName : name,
scopedName,
root.source.input.from,
root.source.input.css
);
const { key, value } = exportEntry;
exports[key] = exports[key] || [];
if (exports[key].indexOf(value) < 0) {
exports[key].push(value);
}
return scopedName;
}
function localizeNode(node) {
switch (node.type) {
case "selector":
node.nodes = node.map(localizeNode);
return node;
case "class":
return selectorParser.className({
value: exportScopedName(
node.value,
node.raws && node.raws.value ? node.raws.value : null
),
});
case "id": {
return selectorParser.id({
value: exportScopedName(
node.value,
node.raws && node.raws.value ? node.raws.value : null
),
});
}
}
throw new Error(
`${node.type} ("${node}") is not allowed in a :local block`
);
}
function traverseNode(node) {
switch (node.type) {
case "pseudo":
if (node.value === ":local") {
if (node.nodes.length !== 1) {
throw new Error('Unexpected comma (",") in :local block');
}
const selector = localizeNode(node.first, node.spaces);
// move the spaces that were around the psuedo selector to the first
// non-container node
selector.first.spaces = node.spaces;
const nextNode = node.next();
if (
nextNode &&
nextNode.type === "combinator" &&
nextNode.value === " " &&
/\\[A-F0-9]{1,6}$/.test(selector.last.value)
) {
selector.last.spaces.after = " ";
}
node.replaceWith(selector);
return;
}
/* falls through */
case "root":
case "selector": {
node.each(traverseNode);
break;
}
case "id":
case "class":
if (exportGlobals) {
exports[node.value] = [node.value];
}
break;
}
return node;
}
// Find any :import and remember imported names
const importedNames = {};
root.walkRules(/^:import\(.+\)$/, (rule) => {
rule.walkDecls((decl) => {
importedNames[decl.prop] = true;
});
});
// Find any :local selectors
root.walkRules((rule) => {
let parsedSelector = selectorParser().astSync(rule);
rule.selector = traverseNode(parsedSelector.clone()).toString();
rule.walkDecls(/composes|compose-with/i, (decl) => {
const localNames = getSingleLocalNamesForComposes(parsedSelector);
const classes = decl.value.split(/\s+/);
classes.forEach((className) => {
const global = /^global\(([^)]+)\)$/.exec(className);
if (global) {
localNames.forEach((exportedName) => {
exports[exportedName].push(global[1]);
});
} else if (hasOwnProperty.call(importedNames, className)) {
localNames.forEach((exportedName) => {
exports[exportedName].push(className);
});
} else if (hasOwnProperty.call(exports, className)) {
localNames.forEach((exportedName) => {
exports[className].forEach((item) => {
exports[exportedName].push(item);
});
});
} else {
throw decl.error(
`referenced class name "${className}" in ${decl.prop} not found`
);
}
});
decl.remove();
});
// Find any :local values
rule.walkDecls((decl) => {
if (!/:local\s*\((.+?)\)/.test(decl.value)) {
return;
}
let tokens = decl.value.split(/(,|'[^']*'|"[^"]*")/);
tokens = tokens.map((token, idx) => {
if (idx === 0 || tokens[idx - 1] === ",") {
let result = token;
const localMatch = /:local\s*\((.+?)\)/.exec(token);
if (localMatch) {
const input = localMatch.input;
const matchPattern = localMatch[0];
const matchVal = localMatch[1];
const newVal = exportScopedName(matchVal);
result = input.replace(matchPattern, newVal);
} else {
return token;
}
return result;
} else {
return token;
}
});
decl.value = tokens.join("");
});
});
// Find any :local keyframes
root.walkAtRules(/keyframes$/i, (atRule) => {
const localMatch = /^\s*:local\s*\((.+?)\)\s*$/.exec(atRule.params);
if (!localMatch) {
return;
}
atRule.params = exportScopedName(localMatch[1]);
});
// If we found any :locals, insert an :export rule
const exportedNames = Object.keys(exports);
if (exportedNames.length > 0) {
const exportRule = rule({ selector: ":export" });
exportedNames.forEach((exportedName) =>
exportRule.append({
prop: exportedName,
value: exports[exportedName].join(" "),
raws: { before: "\n " },
})
);
root.append(exportRule);
}
},
};
};
plugin.postcss = true;
plugin.generateScopedName = function (name, path) {
const sanitisedPath = path
.replace(/\.[^./\\]+$/, "")
.replace(/[\W_]+/g, "_")
.replace(/^_|_$/g, "");
return `_${sanitisedPath}__${name}`.trim();
};
plugin.generateExportEntry = function (name, scopedName) {
return {
key: unescape(name),
value: unescape(scopedName),
};
};
module.exports = plugin;