flow like the river

BACK_BACK/node_modules/postcss-modules-local-by-default/index.js

@@ -0,0 +1,364 @@
+var postcss = require('postcss');
+var Tokenizer = require('css-selector-tokenizer');
+
+function normalizeNodeArray(nodes) {
+  var array = [];
+  nodes.forEach(function(x) {
+    if(Array.isArray(x)) {
+      normalizeNodeArray(x).forEach(function(item) {
+        array.push(item);
+      });
+    } else if(x) {
+      array.push(x);
+    }
+  });
+  if(array.length > 0 && array[array.length - 1].type === 'spacing') {
+    array.pop();
+  }
+  return array;
+}
+
+function localizeNode(node, context) {
+  if(context.ignoreNextSpacing && node.type !== 'spacing') {
+    throw new Error('Missing whitespace after :' + context.ignoreNextSpacing);
+  }
+  if(context.enforceNoSpacing && node.type === 'spacing') {
+    throw new Error('Missing whitespace before :' + context.enforceNoSpacing);
+  }
+
+  var newNodes;
+  switch(node.type) {
+    case 'selectors':
+      var resultingGlobal;
+      context.hasPureGlobals = false;
+      newNodes = node.nodes.map(function(n) {
+        var nContext = {
+          global: context.global,
+          lastWasSpacing: true,
+          hasLocals: false,
+          explicit: false
+        };
+        n = localizeNode(n, nContext);
+        if(typeof resultingGlobal === 'undefined') {
+          resultingGlobal = nContext.global;
+        } else if(resultingGlobal !== nContext.global) {
+          throw new Error('Inconsistent rule global/local result in rule "' +
+            Tokenizer.stringify(node) + '" (multiple selectors must result in the same mode for the rule)');
+        }
+        if(!nContext.hasLocals) {
+          context.hasPureGlobals = true;
+        }
+        return n;
+      });
+      context.global = resultingGlobal;
+      node = Object.create(node);
+      node.nodes = normalizeNodeArray(newNodes);
+      break;
+
+    case 'selector':
+      newNodes = node.nodes.map(function(n) {
+        return localizeNode(n, context);
+      });
+      node = Object.create(node);
+      node.nodes = normalizeNodeArray(newNodes);
+      break;
+
+    case 'spacing':
+      if(context.ignoreNextSpacing) {
+        context.ignoreNextSpacing = false;
+        context.lastWasSpacing = false;
+        context.enforceNoSpacing = false;
+        return null;
+      }
+      context.lastWasSpacing = true;
+      return node;
+
+    case 'pseudo-class':
+      if(node.name === 'local' || node.name === 'global') {
+        if(context.inside) {
+          throw new Error('A :' + node.name + ' is not allowed inside of a :' + context.inside + '(...)');
+        }
+        context.ignoreNextSpacing = context.lastWasSpacing ? node.name : false;
+        context.enforceNoSpacing = context.lastWasSpacing ? false : node.name;
+        context.global = (node.name === 'global');
+        context.explicit = true;
+        return null;
+      }
+      break;
+
+    case 'nested-pseudo-class':
+      var subContext;
+      if(node.name === 'local' || node.name === 'global') {
+        if(context.inside) {
+          throw new Error('A :' + node.name + '(...) is not allowed inside of a :' + context.inside + '(...)');
+        }
+        subContext = {
+          global: (node.name === 'global'),
+          inside: node.name,
+          hasLocals: false,
+          explicit: true
+        };
+        node = node.nodes.map(function(n) {
+          return localizeNode(n, subContext);
+        });
+        // don't leak spacing
+        node[0].before = undefined;
+        node[node.length - 1].after = undefined;
+      } else {
+        subContext = {
+          global: context.global,
+          inside: context.inside,
+          lastWasSpacing: true,
+          hasLocals: false,
+          explicit: context.explicit
+        };
+        newNodes = node.nodes.map(function(n) {
+          return localizeNode(n, subContext);
+        });
+        node = Object.create(node);
+        node.nodes = normalizeNodeArray(newNodes);
+      }
+      if(subContext.hasLocals) {
+        context.hasLocals = true;
+      }
+      break;
+
+    case 'id':
+    case 'class':
+      if(!context.global) {
+        node = {
+          type: 'nested-pseudo-class',
+          name: 'local',
+          nodes: [node]
+        };
+        context.hasLocals = true;
+      }
+      break;
+  }
+
+  // reset context
+  context.lastWasSpacing = false;
+  context.ignoreNextSpacing = false;
+  context.enforceNoSpacing = false;
+  return node;
+}
+
+function localizeDeclNode(node, context) {
+  var newNode;
+  switch(node.type) {
+    case 'item':
+      if(context.localizeNextItem) {
+        newNode = Object.create(node);
+        newNode.name = ':local(' + newNode.name + ')';
+        context.localizeNextItem = false;
+        return newNode;
+      }
+      break;
+
+    case 'nested-item':
+      var newNodes = node.nodes.map(function(n) {
+        return localizeDeclValue(n, context);
+      });
+      node = Object.create(node);
+      node.nodes = newNodes;
+      break;
+
+    case 'url':
+      if(context.options && context.options.rewriteUrl) {
+        newNode = Object.create(node);
+        newNode.url = context.options.rewriteUrl(context.global, node.url);
+        return newNode;
+      }
+      break;
+  }
+  return node;
+}
+
+function localizeDeclValue(valueNode, context) {
+  var newValueNode = Object.create(valueNode);
+  newValueNode.nodes = valueNode.nodes.map(function(node) {
+    return localizeDeclNode(node, context);
+  });
+  return newValueNode;
+}
+
+function localizeAnimationShorthandDeclValueNodes(nodes, context) {
+  var validIdent = validIdent = /^-?[_a-z][_a-z0-9-]*$/i;
+
+  /*
+  The spec defines some keywords that you can use to describe properties such as the timing
+  function. These are still valid animation names, so as long as there is a property that accepts
+  a keyword, it is given priority. Only when all the properties that can take a keyword are
+  exhausted can the animation name be set to the keyword. I.e.
+
+  animation: infinite infinite;
+
+  The animation will repeat an infinite number of times from the first argument, and will have an
+  animation name of infinite from the second.
+  */
+  var animationKeywords = {
+    '$alternate': 1,
+    '$alternate-reverse': 1,
+    '$backwards': 1,
+    '$both': 1,
+    '$ease': 1,
+    '$ease-in': 1,
+    '$ease-in-out': 1,
+    '$ease-out': 1,
+    '$forwards': 1,
+    '$infinite': 1,
+    '$linear': 1,
+    '$none': Infinity, // No matter how many times you write none, it will never be an animation name
+    '$normal': 1,
+    '$paused': 1,
+    '$reverse': 1,
+    '$running': 1,
+    '$step-end': 1,
+    '$step-start': 1,
+    '$initial': Infinity,
+    '$inherit': Infinity,
+    '$unset': Infinity,
+  };
+
+  var didParseAnimationName = false;
+  var parsedAnimationKeywords = {};
+  return nodes.map(function(valueNode) {
+    var value = valueNode.type === 'item'
+      ? valueNode.name.toLowerCase()
+      : null;
+
+    var shouldParseAnimationName = false;
+
+    if (!didParseAnimationName && value && validIdent.test(value)) {
+      if ('$' + value in animationKeywords) {
+        parsedAnimationKeywords['$' + value] = ('$' + value in parsedAnimationKeywords)
+          ? (parsedAnimationKeywords['$' + value] + 1)
+          : 0;
+
+        shouldParseAnimationName = (parsedAnimationKeywords['$' + value] >= animationKeywords['$' + value]);
+      } else {
+        shouldParseAnimationName = true;
+      }
+    }
+
+    var subContext = {
+      options: context.options,
+      global: context.global,
+      localizeNextItem: shouldParseAnimationName && !context.global
+    };
+    return localizeDeclNode(valueNode, subContext);
+  });
+}
+
+function localizeAnimationShorthandDeclValues(valuesNode, decl, context) {
+  var newValuesNode = Object.create(valuesNode);
+  newValuesNode.nodes = valuesNode.nodes.map(function(valueNode, index) {
+    var newValueNode = Object.create(valueNode);
+    newValueNode.nodes = localizeAnimationShorthandDeclValueNodes(valueNode.nodes, context);
+    return newValueNode;
+  });
+  decl.value = Tokenizer.stringifyValues(newValuesNode);
+}
+
+function localizeDeclValues(localize, valuesNode, decl, context) {
+  var newValuesNode = Object.create(valuesNode);
+  newValuesNode.nodes = valuesNode.nodes.map(function(valueNode) {
+    var subContext = {
+      options: context.options,
+      global: context.global,
+      localizeNextItem: localize && !context.global
+    };
+    return localizeDeclValue(valueNode, subContext);
+  });
+  decl.value = Tokenizer.stringifyValues(newValuesNode);
+}
+
+function localizeDecl(decl, context) {
+  var valuesNode = Tokenizer.parseValues(decl.value);
+
+  var isAnimation = /animation?$/.test(decl.prop);
+  if (isAnimation) return localizeAnimationShorthandDeclValues(valuesNode, decl, context);
+
+  var isAnimationName = /animation(-name)?$/.test(decl.prop);
+  if (isAnimationName) return localizeDeclValues(true, valuesNode, decl, context);
+
+  return localizeDeclValues(false, valuesNode, decl, context);
+}
+
+module.exports = postcss.plugin('postcss-modules-local-by-default', function (options) {
+  if (typeof options !== 'object') {
+    options = {}; // If options is undefined or not an object the plugin fails
+  }
+  if(options && options.mode) {
+    if(options.mode !== 'global' && options.mode !== 'local' && options.mode !== 'pure') {
+      throw new Error('options.mode must be either "global", "local" or "pure" (default "local")');
+    }
+  }
+  var pureMode = options && options.mode === 'pure';
+  var globalMode = options && options.mode === 'global';
+  return function(css) {
+    css.walkAtRules(function(atrule) {
+      if(/keyframes$/.test(atrule.name)) {
+        var globalMatch = /^\s*:global\s*\((.+)\)\s*$/.exec(atrule.params);
+        var localMatch = /^\s*:local\s*\((.+)\)\s*$/.exec(atrule.params);
+        var globalKeyframes = globalMode;
+        if(globalMatch) {
+          if(pureMode) {
+            throw atrule.error('@keyframes :global(...) is not allowed in pure mode');
+          }
+          atrule.params = globalMatch[1];
+          globalKeyframes = true;
+        } else if(localMatch) {
+          atrule.params = localMatch[0];
+          globalKeyframes = false;
+        } else if(!globalMode) {
+          atrule.params = ':local(' + atrule.params + ')';
+        }
+        atrule.walkDecls(function(decl) {
+          localizeDecl(decl, {
+            options: options,
+            global: globalKeyframes
+          });
+        });
+      } else if(atrule.nodes) {
+        atrule.nodes.forEach(function(decl) {
+          if(decl.type === 'decl') {
+            localizeDecl(decl, {
+              options: options,
+              global: globalMode
+            });
+          }
+        });
+      }
+    });
+    css.walkRules(function(rule) {
+      if(rule.parent.type === 'atrule' && /keyframes$/.test(rule.parent.name)) {
+        // ignore keyframe rules
+        return;
+      }
+      var selector = Tokenizer.parse(rule.selector);
+      var context = {
+        options: options,
+        global: globalMode,
+        hasPureGlobals: false
+      };
+      var newSelector;
+      try {
+        newSelector = localizeNode(selector, context);
+      } catch(e) {
+        throw rule.error(e.message);
+      }
+      if(pureMode && context.hasPureGlobals) {
+        throw rule.error('Selector "' + Tokenizer.stringify(selector) + '" is not pure ' +
+          '(pure selectors must contain at least one local class or id)');
+      }
+      // Less-syntax mixins parse as rules with no nodes
+      if (rule.nodes) {
+        rule.nodes.forEach(function(decl) {
+          localizeDecl(decl, context);
+        });
+      }
+      rule.selector = Tokenizer.stringify(newSelector);
+    });
+  };
+});