web animations update

scripts/resources/web-animations-js/src/handler-utils.js

@@ -0,0 +1,177 @@
+// Copyright 2014 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+//   You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//   See the License for the specific language governing permissions and
+// limitations under the License.
+
+(function(scope) {
+
+  // consume* functions return a 2 value array of [parsed-data, '' or not-yet consumed input]
+
+  // Regex should be anchored with /^
+  function consumeToken(regex, string) {
+    var result = regex.exec(string);
+    if (result) {
+      result = regex.ignoreCase ? result[0].toLowerCase() : result[0];
+      return [result, string.substr(result.length)];
+    }
+  }
+
+  function consumeTrimmed(consumer, string) {
+    string = string.replace(/^\s*/, '');
+    var result = consumer(string);
+    if (result) {
+      return [result[0], result[1].replace(/^\s*/, '')];
+    }
+  }
+
+  function consumeRepeated(consumer, separator, string) {
+    consumer = consumeTrimmed.bind(null, consumer);
+    var list = [];
+    while (true) {
+      var result = consumer(string);
+      if (!result) {
+        return [list, string];
+      }
+      list.push(result[0]);
+      string = result[1];
+      result = consumeToken(separator, string);
+      if (!result || result[1] == '') {
+        return [list, string];
+      }
+      string = result[1];
+    }
+  }
+
+  // Consumes a token or expression with balanced parentheses
+  function consumeParenthesised(parser, string) {
+    var nesting = 0;
+    for (var n = 0; n < string.length; n++) {
+      if (/\s|,/.test(string[n]) && nesting == 0) {
+        break;
+      } else if (string[n] == '(') {
+        nesting++;
+      } else if (string[n] == ')') {
+        nesting--;
+        if (nesting == 0)
+          n++;
+        if (nesting <= 0)
+          break;
+      }
+    }
+    var parsed = parser(string.substr(0, n));
+    return parsed == undefined ? undefined : [parsed, string.substr(n)];
+  }
+
+  function lcm(a, b) {
+    var c = a;
+    var d = b;
+    while (c && d)
+      c > d ? c %= d : d %= c;
+    c = (a * b) / (c + d);
+    return c;
+  }
+
+  function ignore(value) {
+    return function(input) {
+      var result = value(input);
+      if (result)
+        result[0] = undefined;
+      return result;
+    }
+  }
+
+  function optional(value, defaultValue) {
+    return function(input) {
+      var result = value(input);
+      if (result)
+        return result;
+      return [defaultValue, input];
+    }
+  }
+
+  function consumeList(list, input) {
+    var output = [];
+    for (var i = 0; i < list.length; i++) {
+      var result = scope.consumeTrimmed(list[i], input);
+      if (!result || result[0] == '')
+        return;
+      if (result[0] !== undefined)
+        output.push(result[0]);
+      input = result[1];
+    }
+    if (input == '') {
+      return output;
+    }
+  }
+
+  function mergeWrappedNestedRepeated(wrap, nestedMerge, separator, left, right) {
+    var matchingLeft = [];
+    var matchingRight = [];
+    var reconsititution = [];
+    var length = lcm(left.length, right.length);
+    for (var i = 0; i < length; i++) {
+      var thing = nestedMerge(left[i % left.length], right[i % right.length]);
+      if (!thing) {
+        return;
+      }
+      matchingLeft.push(thing[0]);
+      matchingRight.push(thing[1]);
+      reconsititution.push(thing[2]);
+    }
+    return [matchingLeft, matchingRight, function(positions) {
+      var result = positions.map(function(position, i) {
+        return reconsititution[i](position);
+      }).join(separator);
+      return wrap ? wrap(result) : result;
+    }];
+  }
+
+  function mergeList(left, right, list) {
+    var lefts = [];
+    var rights = [];
+    var functions = [];
+    var j = 0;
+    for (var i = 0; i < list.length; i++) {
+      if (typeof list[i] == 'function') {
+        var result = list[i](left[j], right[j++]);
+        lefts.push(result[0]);
+        rights.push(result[1]);
+        functions.push(result[2]);
+      } else {
+        (function(pos) {
+          lefts.push(false);
+          rights.push(false);
+          functions.push(function() { return list[pos]; });
+        })(i);
+      }
+    }
+    return [lefts, rights, function(results) {
+      var result = '';
+      for (var i = 0; i < results.length; i++) {
+        result += functions[i](results[i]);
+      }
+      return result;
+    }];
+  }
+
+  scope.consumeToken = consumeToken;
+  scope.consumeTrimmed = consumeTrimmed;
+  scope.consumeRepeated = consumeRepeated;
+  scope.consumeParenthesised = consumeParenthesised;
+  scope.ignore = ignore;
+  scope.optional = optional;
+  scope.consumeList = consumeList;
+  scope.mergeNestedRepeated = mergeWrappedNestedRepeated.bind(null, null);
+  scope.mergeWrappedNestedRepeated = mergeWrappedNestedRepeated;
+  scope.mergeList = mergeList;
+
+})(webAnimations1);