var override = require('../utils/override');
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var INTEGER_PATTERN = /^\d+$/;
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var ALL_UNITS = ['*', 'all'];
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var DEFAULT_PRECISION = 'off'; // all precision changes are disabled
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var DIRECTIVES_SEPARATOR = ','; // e.g. *=5,px=3
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var DIRECTIVE_VALUE_SEPARATOR = '='; // e.g. *=5
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function roundingPrecisionFrom(source) {
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return override(defaults(DEFAULT_PRECISION), buildPrecisionFrom(source));
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}
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function defaults(value) {
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return {
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'ch': value,
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'cm': value,
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'em': value,
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'ex': value,
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'in': value,
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'mm': value,
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'pc': value,
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'pt': value,
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'px': value,
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'q': value,
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'rem': value,
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'vh': value,
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'vmax': value,
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'vmin': value,
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'vw': value,
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'%': value
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};
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}
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function buildPrecisionFrom(source) {
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if (source === null || source === undefined) {
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return {};
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}
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if (typeof source == 'boolean') {
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return {};
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}
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if (typeof source == 'number' && source == -1) {
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return defaults(DEFAULT_PRECISION);
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}
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if (typeof source == 'number') {
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return defaults(source);
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}
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if (typeof source == 'string' && INTEGER_PATTERN.test(source)) {
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return defaults(parseInt(source));
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}
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if (typeof source == 'string' && source == DEFAULT_PRECISION) {
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return defaults(DEFAULT_PRECISION);
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}
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if (typeof source == 'object') {
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return source;
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}
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return source
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.split(DIRECTIVES_SEPARATOR)
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.reduce(function (accumulator, directive) {
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var directiveParts = directive.split(DIRECTIVE_VALUE_SEPARATOR);
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var name = directiveParts[0];
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var value = parseInt(directiveParts[1]);
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if (isNaN(value) || value == -1) {
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value = DEFAULT_PRECISION;
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}
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if (ALL_UNITS.indexOf(name) > -1) {
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accumulator = override(accumulator, defaults(value));
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} else {
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accumulator[name] = value;
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}
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return accumulator;
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}, {});
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}
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module.exports = {
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DEFAULT: DEFAULT_PRECISION,
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roundingPrecisionFrom: roundingPrecisionFrom
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};
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