153 lines
3.8 KiB
JavaScript
153 lines
3.8 KiB
JavaScript
'use strict';
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const declarationValueIndex = require('../../utils/declarationValueIndex');
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const isNumbery = require('../../utils/isNumbery');
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const isStandardSyntaxValue = require('../../utils/isStandardSyntaxValue');
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const isVariable = require('../../utils/isVariable');
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const keywordSets = require('../../reference/keywordSets');
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const optionsMatches = require('../../utils/optionsMatches');
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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 ruleName = 'font-weight-notation';
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const messages = ruleMessages(ruleName, {
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expected: (type) => `Expected ${type} font-weight notation`,
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invalidNamed: (name) => `Unexpected invalid font-weight name "${name}"`,
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});
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const INHERIT_KEYWORD = 'inherit';
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const INITIAL_KEYWORD = 'initial';
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const NORMAL_KEYWORD = 'normal';
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const WEIGHTS_WITH_KEYWORD_EQUIVALENTS = ['400', '700'];
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function rule(expectation, options) {
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return (root, result) => {
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const validOptions = validateOptions(
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result,
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ruleName,
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{
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actual: expectation,
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possible: ['numeric', 'named-where-possible'],
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},
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{
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actual: options,
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possible: {
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ignore: ['relative'],
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},
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optional: true,
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},
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);
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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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if (decl.prop.toLowerCase() === 'font-weight') {
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checkWeight(decl.value, decl);
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}
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if (decl.prop.toLowerCase() === 'font') {
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checkFont(decl);
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}
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});
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function checkFont(decl) {
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const valueList = postcss.list.space(decl.value);
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// We do not need to more carefully distinguish font-weight
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// numbers from unitless line-heights because line-heights in
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// `font` values need to be part of a font-size/line-height pair
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const hasNumericFontWeight = valueList.some(isNumbery);
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for (const value of postcss.list.space(decl.value)) {
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if (
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(value.toLowerCase() === NORMAL_KEYWORD && !hasNumericFontWeight) ||
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isNumbery(value) ||
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(value.toLowerCase() !== NORMAL_KEYWORD &&
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keywordSets.fontWeightKeywords.has(value.toLowerCase()))
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) {
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checkWeight(value, decl);
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return;
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}
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}
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}
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function checkWeight(weightValue, decl) {
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if (!isStandardSyntaxValue(weightValue)) {
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return;
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}
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if (isVariable(weightValue)) {
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return;
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}
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if (
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weightValue.toLowerCase() === INHERIT_KEYWORD ||
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weightValue.toLowerCase() === INITIAL_KEYWORD
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) {
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return;
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}
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if (
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optionsMatches(options, 'ignore', 'relative') &&
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keywordSets.fontWeightRelativeKeywords.has(weightValue.toLowerCase())
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) {
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return;
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}
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const weightValueOffset = decl.value.indexOf(weightValue);
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if (expectation === 'numeric') {
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if (decl.parent.type === 'atrule' && decl.parent.name.toLowerCase() === 'font-face') {
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const weightValueNumbers = postcss.list.space(weightValue);
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if (!weightValueNumbers.every(isNumbery)) {
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return complain(messages.expected('numeric'));
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}
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return;
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}
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if (!isNumbery(weightValue)) {
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return complain(messages.expected('numeric'));
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}
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}
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if (expectation === 'named-where-possible') {
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if (isNumbery(weightValue)) {
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if (WEIGHTS_WITH_KEYWORD_EQUIVALENTS.includes(weightValue)) {
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complain(messages.expected('named'));
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}
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return;
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}
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if (
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!keywordSets.fontWeightKeywords.has(weightValue.toLowerCase()) &&
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weightValue.toLowerCase() !== NORMAL_KEYWORD
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) {
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return complain(messages.invalidNamed(weightValue));
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}
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}
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function complain(message) {
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report({
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ruleName,
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result,
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message,
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node: decl,
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index: declarationValueIndex(decl) + weightValueOffset,
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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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