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