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