102 lines
2.6 KiB
JavaScript
102 lines
2.6 KiB
JavaScript
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var decls = require('./decls.json');
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function template(string, data) {
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return string.replace(/\$\{([\w\-\.]*)\}/g, function (_str, key) {
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var v = data[key];
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return typeof v !== 'undefined' && v !== null ? v : '';
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});
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}
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/*
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Rules legend:
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- combined - if rule is combined it will be rendered with template
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- combined and basic rules are present in basic reset
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- combined, basic and inherited rules are present in full reset
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*/
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function _getRulesMap(inputDecls) {
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return inputDecls
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.filter(function (decl) {
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return !decl.combined;
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})
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.reduce(function (map, decl) {
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map[decl.prop.replace(/\-/g, '')] = decl.initial;
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return map;
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}, {});
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}
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function _compileDecls(inputDecls) {
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var templateVars = _getRulesMap(inputDecls);
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return inputDecls.map(function (decl) {
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if (decl.combined && decl.initial) {
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decl.initial = template(decl.initial.replace(/\-/g, ''), templateVars);
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}
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return decl;
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});
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}
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function _getRequirements(inputDecls) {
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return inputDecls.reduce(function (map, decl) {
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if (!decl.contains) return map;
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return decl.contains.reduce(function (mapInner, dependency) {
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mapInner[dependency] = decl;
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return mapInner;
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}, map);
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}, {});
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}
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function _expandContainments(inputDecls) {
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var requiredMap = _getRequirements(inputDecls);
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return inputDecls
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.filter(function (decl) {
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return !decl.contains;
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}).map(function (decl) {
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var dependency = requiredMap[decl.prop];
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if (dependency) {
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decl.requiredBy = dependency.prop;
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decl.basic = decl.basic || dependency.basic;
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decl.inherited = decl.inherited || dependency.inherited;
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}
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return decl;
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});
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}
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var compiledDecls = _expandContainments(_compileDecls(decls));
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function _clearDecls(rules, value) {
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return rules.map(function (rule) {
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return {
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prop: rule.prop,
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value: value.replace(/\binitial\b/g, rule.initial)
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};
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});
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}
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function _allDecls(onlyInherited) {
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return compiledDecls.filter(function (decl) {
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var allowed = decl.combined || decl.basic;
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if (onlyInherited) return allowed && decl.inherited;
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return allowed;
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});
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}
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function _concreteDecl(declName) {
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return compiledDecls.filter(function (decl) {
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return declName === decl.prop || declName === decl.requiredBy;
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});
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}
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function makeFallbackFunction(onlyInherited) {
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return function (declName, declValue) {
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var result;
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if (declName === 'all') {
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result = _allDecls(onlyInherited);
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} else {
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result = _concreteDecl(declName);
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}
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return _clearDecls(result, declValue);
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};
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}
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module.exports = makeFallbackFunction;
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