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reportUnknownRuleNames.js
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reportUnknownRuleNames.js
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"use strict";
const levenshteinDistance = require("./utils/levenshteinDistance");
const rules = require("./rules");
const MAX_LEVENSHTEIN_DISTANCE = 6;
const MAX_SUGGESTIONS_COUNT = 3;
function extractSuggestions(ruleName) {
const suggestions = new Array(MAX_LEVENSHTEIN_DISTANCE);
for (let i = 0; i < suggestions.length; i++) {
suggestions[i] = [];
}
rules.forEach(existRuleName => {
const distance = levenshteinDistance(
existRuleName,
ruleName,
MAX_LEVENSHTEIN_DISTANCE
);
if (distance > 0) {
suggestions[distance - 1].push(existRuleName);
}
});
let result = [];
for (let i = 0; i < suggestions.length; i++) {
if (suggestions[i].length > 0) {
if (i < 3) {
return suggestions[i].slice(0, MAX_SUGGESTIONS_COUNT);
}
result = result.concat(suggestions[i]);
}
}
return result.slice(0, MAX_SUGGESTIONS_COUNT);
}
function rejectMessage(ruleName, suggestions = []) {
return (
`Unknown rule ${ruleName}.` +
(suggestions.length > 0 ? ` Did you mean ${suggestions.join(", ")}?` : "")
);
}
const cache = new Map();
module.exports = function reportUnknownRuleNames(
unknownRuleName,
postcssRoot,
postcssResult
) {
const suggestions = cache.has(unknownRuleName)
? cache.get(unknownRuleName)
: extractSuggestions(unknownRuleName);
const warningProperties = {
severity: "error",
rule: unknownRuleName,
node: postcssRoot,
index: 0
};
cache.set(unknownRuleName, suggestions);
postcssResult.warn(
rejectMessage(unknownRuleName, suggestions),
warningProperties
);
};