--- /dev/null
+"use strict";
+
+const declarationValueIndex = require("../../utils/declarationValueIndex");
+const isSingleLineString = require("../../utils/isSingleLineString");
+const isStandardSyntaxFunction = require("../../utils/isStandardSyntaxFunction");
+const report = require("../../utils/report");
+const ruleMessages = require("../../utils/ruleMessages");
+const validateOptions = require("../../utils/validateOptions");
+const valueParser = require("postcss-value-parser");
+
+const ruleName = "function-parentheses-newline-inside";
+
+const messages = ruleMessages(ruleName, {
+ expectedOpening: 'Expected newline after "("',
+ expectedClosing: 'Expected newline before ")"',
+ expectedOpeningMultiLine:
+ 'Expected newline after "(" in a multi-line function',
+ rejectedOpeningMultiLine:
+ 'Unexpected whitespace after "(" in a multi-line function',
+ expectedClosingMultiLine:
+ 'Expected newline before ")" in a multi-line function',
+ rejectedClosingMultiLine:
+ 'Unexpected whitespace before ")" in a multi-line function'
+});
+
+const rule = function(expectation) {
+ return (root, result) => {
+ const validOptions = validateOptions(result, ruleName, {
+ actual: expectation,
+ possible: ["always", "always-multi-line", "never-multi-line"]
+ });
+ if (!validOptions) {
+ return;
+ }
+
+ root.walkDecls(decl => {
+ if (decl.value.indexOf("(") === -1) {
+ return;
+ }
+
+ valueParser(decl.value).walk(valueNode => {
+ if (valueNode.type !== "function") {
+ return;
+ }
+
+ if (!isStandardSyntaxFunction(valueNode)) {
+ return;
+ }
+
+ const functionString = valueParser.stringify(valueNode);
+ const isMultiLine = !isSingleLineString(functionString);
+ function containsNewline(str) {
+ return str.indexOf("\n") !== -1;
+ }
+
+ // Check opening ...
+
+ const openingIndex = valueNode.sourceIndex + valueNode.value.length + 1;
+
+ if (expectation === "always" && !containsNewline(valueNode.before)) {
+ complain(messages.expectedOpening, openingIndex);
+ }
+
+ if (
+ isMultiLine &&
+ expectation === "always-multi-line" &&
+ !containsNewline(valueNode.before)
+ ) {
+ complain(messages.expectedOpeningMultiLine, openingIndex);
+ }
+
+ if (
+ isMultiLine &&
+ expectation === "never-multi-line" &&
+ valueNode.before !== ""
+ ) {
+ complain(messages.rejectedOpeningMultiLine, openingIndex);
+ }
+
+ // Check closing ...
+
+ const closingIndex = valueNode.sourceIndex + functionString.length - 2;
+
+ if (expectation === "always" && !containsNewline(valueNode.after)) {
+ complain(messages.expectedClosing, closingIndex);
+ }
+
+ if (
+ isMultiLine &&
+ expectation === "always-multi-line" &&
+ !containsNewline(valueNode.after)
+ ) {
+ complain(messages.expectedClosingMultiLine, closingIndex);
+ }
+
+ if (
+ isMultiLine &&
+ expectation === "never-multi-line" &&
+ valueNode.after !== ""
+ ) {
+ complain(messages.rejectedClosingMultiLine, closingIndex);
+ }
+ });
+
+ function complain(message, offset) {
+ report({
+ ruleName,
+ result,
+ message,
+ node: decl,
+ index: declarationValueIndex(decl) + offset
+ });
+ }
+ });
+ };
+};
+
+rule.ruleName = ruleName;
+rule.messages = messages;
+module.exports = rule;