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'use strict';
const _ = require('lodash');
const report = require('../../utils/report');
const ruleMessages = require('../../utils/ruleMessages');
const validateOptions = require('../../utils/validateOptions');
const valueParser = require('postcss-value-parser');
const ruleName = 'function-max-empty-lines';
const messages = ruleMessages(ruleName, {
expected: (max) => `Expected no more than ${max} empty ${max === 1 ? 'line' : 'lines'}`,
});
function placeIndexOnValueStart(decl) {
return decl.prop.length + decl.raws.between.length - 1;
}
function rule(max, options, context) {
const maxAdjacentNewlines = max + 1;
return (root, result) => {
const validOptions = validateOptions(result, ruleName, {
actual: max,
possible: _.isNumber,
});
if (!validOptions) {
return;
}
const violatedCRLFNewLinesRegex = new RegExp(`(?:\r\n){${maxAdjacentNewlines + 1},}`);
const violatedLFNewLinesRegex = new RegExp(`\n{${maxAdjacentNewlines + 1},}`);
const allowedLFNewLinesString = context.fix ? '\n'.repeat(maxAdjacentNewlines) : '';
const allowedCRLFNewLinesString = context.fix ? '\r\n'.repeat(maxAdjacentNewlines) : '';
root.walkDecls((decl) => {
if (!decl.value.includes('(')) {
return;
}
const stringValue = decl.raws.value ? decl.raws.value.raw : decl.value;
const splittedValue = [];
let sourceIndexStart = 0;
valueParser(stringValue).walk((node) => {
if (
node.type !== 'function' /* ignore non functions */ ||
node.value.length === 0 /* ignore sass lists */
) {
return;
}
const stringifiedNode = valueParser.stringify(node);
if (
!violatedLFNewLinesRegex.test(stringifiedNode) &&
!violatedCRLFNewLinesRegex.test(stringifiedNode)
) {
return;
}
if (context.fix) {
const newNodeString = stringifiedNode
.replace(new RegExp(violatedLFNewLinesRegex, 'gm'), allowedLFNewLinesString)
.replace(new RegExp(violatedCRLFNewLinesRegex, 'gm'), allowedCRLFNewLinesString);
splittedValue.push([
stringValue.slice(sourceIndexStart, node.sourceIndex),
newNodeString,
]);
sourceIndexStart = node.sourceIndex + stringifiedNode.length;
} else {
report({
message: messages.expected(max),
node: decl,
index: placeIndexOnValueStart(decl) + node.sourceIndex,
result,
ruleName,
});
}
});
if (context.fix && splittedValue.length > 0) {
const updatedValue =
splittedValue.reduce((acc, curr) => acc + curr[0] + curr[1], '') +
stringValue.slice(sourceIndexStart);
if (decl.raws.value) {
decl.raws.value.raw = updatedValue;
} else {
decl.value = updatedValue;
}
}
});
};
}
rule.ruleName = ruleName;
rule.messages = messages;
module.exports = rule;
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