111 lines
2.8 KiB
JavaScript
111 lines
2.8 KiB
JavaScript
// @ts-nocheck
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'use strict';
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const declarationValueIndex = require('../../utils/declarationValueIndex');
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const functionArgumentsSearch = require('../../utils/functionArgumentsSearch');
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const isStandardSyntaxValue = require('../../utils/isStandardSyntaxValue');
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const postcss = require('postcss');
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const report = require('../../utils/report');
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const ruleMessages = require('../../utils/ruleMessages');
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const validateOptions = require('../../utils/validateOptions');
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const valueParser = require('postcss-value-parser');
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const ruleName = 'function-linear-gradient-no-nonstandard-direction';
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const messages = ruleMessages(ruleName, {
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rejected: 'Unexpected nonstandard direction',
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});
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function isStandardDirection(source, withToPrefix) {
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const regexp = withToPrefix
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? /^to (top|left|bottom|right)(?: (top|left|bottom|right))?$/
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: /^(top|left|bottom|right)(?: (top|left|bottom|right))?$/;
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const matches = source.match(regexp);
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if (!matches) {
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return false;
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}
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if (matches.length === 2) {
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return true;
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}
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// Cannot repeat side-or-corner, e.g. "to top top"
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if (matches.length === 3 && matches[1] !== matches[2]) {
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return true;
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}
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return false;
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}
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function rule(actual) {
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return (root, result) => {
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const validOptions = validateOptions(result, ruleName, { actual });
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if (!validOptions) {
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return;
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}
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root.walkDecls((decl) => {
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valueParser(decl.value).walk((valueNode) => {
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if (valueNode.type !== 'function') {
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return;
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}
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functionArgumentsSearch(
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valueParser.stringify(valueNode).toLowerCase(),
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'linear-gradient',
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(expression, expressionIndex) => {
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const firstArg = expression.split(',')[0].trim();
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// If the first arg is not standard, return early
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if (!isStandardSyntaxValue(firstArg)) {
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return;
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}
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// If the first character is a number, we can assume the user intends an angle
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if (/[\d.]/.test(firstArg[0])) {
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if (/^[\d.]+(?:deg|grad|rad|turn)$/.test(firstArg)) {
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return;
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}
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complain();
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return;
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}
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// The first argument may not be a direction: it may be an angle,
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// or a color stop (in which case user gets default direction, "to bottom")
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// cf. https://drafts.csswg.org/css-images-3/#linear-gradient-syntax
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if (!/left|right|top|bottom/.test(firstArg)) {
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return;
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}
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const withToPrefix = !postcss.vendor.prefix(valueNode.value);
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if (!isStandardDirection(firstArg, withToPrefix)) {
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complain();
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}
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function complain() {
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report({
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message: messages.rejected,
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node: decl,
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index: declarationValueIndex(decl) + valueNode.sourceIndex + expressionIndex,
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result,
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ruleName,
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});
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}
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},
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);
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});
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});
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};
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}
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rule.ruleName = ruleName;
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rule.messages = messages;
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module.exports = rule;
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