RAHHH

backend/frontend/node_modules/postcss-initial/lib/rules-fabric.js

@@ -0,0 +1,101 @@
+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;