73 lines
1.9 KiB
JavaScript
73 lines
1.9 KiB
JavaScript
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var split = require('../../../utils/split');
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var startsAsUrl = require('./starts-as-url');
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var OptimizationLevel = require('../../../options/optimization-level').OptimizationLevel;
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var EXPRESSION_PATTERN = /^expression\(.*\)$/;
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var ANY_FUNCTION_PATTERN = /^(-(?:moz|ms|o|webkit)-[a-z-]+|[a-z-]+)\((.+)\)$/;
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var TOKEN_SEPARATOR_PATTERN = /([\s,/])/;
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var DOT_ZERO_PATTERN = /(^|\D)\.0+(\D|$)/g;
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var FRACTION_PATTERN = /\.([1-9]*)0+(\D|$)/g;
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var LEADING_ZERO_FRACTION_PATTERN = /(^|\D)0\.(\d)/g;
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var MINUS_ZERO_FRACTION_PATTERN = /([^\w\d-]|^)-0([^.]|$)/g;
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var ZERO_PREFIXED_UNIT_PATTERN = /(^|\s)0+([1-9])/g;
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function optimizeRecursively(value) {
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var functionTokens;
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var tokens;
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if (startsAsUrl(value)) {
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return value;
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}
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if (EXPRESSION_PATTERN.test(value)) {
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return value;
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}
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functionTokens = ANY_FUNCTION_PATTERN.exec(value);
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if (!functionTokens) {
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return optimizeFractions(value);
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}
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tokens = split(functionTokens[2], TOKEN_SEPARATOR_PATTERN)
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.map(function(token) { return optimizeRecursively(token); });
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return functionTokens[1] + '(' + tokens.join('') + ')';
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}
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function optimizeFractions(value) {
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if (value.indexOf('0') == -1) {
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return value;
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}
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if (value.indexOf('-') > -1) {
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value = value
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.replace(MINUS_ZERO_FRACTION_PATTERN, '$10$2')
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.replace(MINUS_ZERO_FRACTION_PATTERN, '$10$2');
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}
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return value
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.replace(ZERO_PREFIXED_UNIT_PATTERN, '$1$2')
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.replace(DOT_ZERO_PATTERN, '$10$2')
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.replace(FRACTION_PATTERN, function(match, nonZeroPart, suffix) {
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return (nonZeroPart.length > 0 ? '.' : '') + nonZeroPart + suffix;
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})
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.replace(LEADING_ZERO_FRACTION_PATTERN, '$1.$2');
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}
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var plugin = {
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level1: {
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value: function fraction(name, value, options) {
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if (!options.level[OptimizationLevel.One].replaceZeroUnits) {
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return value;
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}
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return optimizeRecursively(value);
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}
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}
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};
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module.exports = plugin;
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