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This also cheapens cache // invalidation, since you can just reset path.__childCache to null. return path.__childCache || (path.__childCache = Object.create(null)); } function getChildPath(path, name) { var cache = getChildCache(path); var actualChildValue = path.getValueProperty(name); var childPath = cache[name]; if (!hasOwn.call(cache, name) || // Ensure consistency between cache and reality. childPath.value !== actualChildValue) { childPath = cache[name] = new path.constructor( actualChildValue, path, name ); } return childPath; } // This method is designed to be overridden by subclasses that need to // handle missing properties, etc. Pp.getValueProperty = function getValueProperty(name) { return this.value[name]; }; Pp.get = function get(name) { var path = this; var names = arguments; var count = names.length; for (var i = 0; i < count; ++i) { path = getChildPath(path, names[i]); } return path; }; Pp.each = function each(callback, context) { var childPaths = []; var len = this.value.length; var i = 0; // Collect all the original child paths before invoking the callback. for (var i = 0; i < len; ++i) { if (hasOwn.call(this.value, i)) { childPaths[i] = this.get(i); } } // Invoke the callback on just the original child paths, regardless of // any modifications made to the array by the callback. I chose these // semantics over cleverly invoking the callback on new elements because // this way is much easier to reason about. context = context || this; for (i = 0; i < len; ++i) { if (hasOwn.call(childPaths, i)) { callback.call(context, childPaths[i]); } } }; Pp.map = function map(callback, context) { var result = []; this.each(function (childPath) { result.push(callback.call(this, childPath)); }, context); return result; }; Pp.filter = function filter(callback, context) { var result = []; this.each(function (childPath) { if (callback.call(this, childPath)) { result.push(childPath); } }, context); return result; }; function emptyMoves() {} function getMoves(path, offset, start, end) { isArray.assert(path.value); if (offset === 0) { return emptyMoves; } var length = path.value.length; if (length < 1) { return emptyMoves; } var argc = arguments.length; if (argc === 2) { start = 0; end = length; } else if (argc === 3) { start = Math.max(start, 0); end = length; } else { start = Math.max(start, 0); end = Math.min(end, length); } isNumber.assert(start); isNumber.assert(end); var moves = Object.create(null); var cache = getChildCache(path); for (var i = start; i < end; ++i) { if (hasOwn.call(path.value, i)) { var childPath = path.get(i); if (childPath.name !== i) { throw new Error(""); } var newIndex = i + offset; childPath.name = newIndex; moves[newIndex] = childPath; delete cache[i]; } } delete cache.length; return function () { for (var newIndex in moves) { var childPath = moves[newIndex]; if (childPath.name !== +newIndex) { throw new Error(""); } cache[newIndex] = childPath; path.value[newIndex] = childPath.value; } }; } Pp.shift = function shift() { var move = getMoves(this, -1); var result = this.value.shift(); move(); return result; }; Pp.unshift = function unshift(node) { var move = getMoves(this, arguments.length); var result = this.value.unshift.apply(this.value, arguments); move(); return result; }; Pp.push = function push(node) { isArray.assert(this.value); delete getChildCache(this).length return this.value.push.apply(this.value, arguments); }; Pp.pop = function pop() { isArray.assert(this.value); var cache = getChildCache(this); delete cache[this.value.length - 1]; delete cache.length; return this.value.pop(); }; Pp.insertAt = function insertAt(index, node) { var argc = arguments.length; var move = getMoves(this, argc - 1, index); if (move === emptyMoves) { return this; } index = Math.max(index, 0); for (var i = 1; i < argc; ++i) { this.value[index + i - 1] = arguments[i]; } move(); return this; }; Pp.insertBefore = function insertBefore(node) { var pp = this.parentPath; var argc = arguments.length; var insertAtArgs = [this.name]; for (var i = 0; i < argc; ++i) { insertAtArgs.push(arguments[i]); } return pp.insertAt.apply(pp, insertAtArgs); }; Pp.insertAfter = function insertAfter(node) { var pp = this.parentPath; var argc = arguments.length; var insertAtArgs = [this.name + 1]; for (var i = 0; i < argc; ++i) { insertAtArgs.push(arguments[i]); } return pp.insertAt.apply(pp, insertAtArgs); }; function repairRelationshipWithParent(path) { if (!(path instanceof Path)) { throw new Error(""); } var pp = path.parentPath; if (!pp) { // Orphan paths have no relationship to repair. return path; } var parentValue = pp.value; var parentCache = getChildCache(pp); // Make sure parentCache[path.name] is populated. if (parentValue[path.name] === path.value) { parentCache[path.name] = path; } else if (isArray.check(parentValue)) { // Something caused path.name to become out of date, so attempt to // recover by searching for path.value in parentValue. var i = parentValue.indexOf(path.value); if (i >= 0) { parentCache[path.name = i] = path; } } else { // If path.value disagrees with parentValue[path.name], and // path.name is not an array index, let path.value become the new // parentValue[path.name] and update parentCache accordingly. parentValue[path.name] = path.value; parentCache[path.name] = path; } if (parentValue[path.name] !== path.value) { throw new Error(""); } if (path.parentPath.get(path.name) !== path) { throw new Error(""); } return path; } Pp.replace = function replace(replacement) { var results = []; var parentValue = this.parentPath.value; var parentCache = getChildCache(this.parentPath); var count = arguments.length; repairRelationshipWithParent(this); if (isArray.check(parentValue)) { var originalLength = parentValue.length; var move = getMoves(this.parentPath, count - 1, this.name + 1); var spliceArgs = [this.name, 1]; for (var i = 0; i < count; ++i) { spliceArgs.push(arguments[i]); } var splicedOut = parentValue.splice.apply(parentValue, spliceArgs); if (splicedOut[0] !== this.value) { throw new Error(""); } if (parentValue.length !== (originalLength - 1 + count)) { throw new Error(""); } move(); if (count === 0) { delete this.value; delete parentCache[this.name]; this.__childCache = null; } else { if (parentValue[this.name] !== replacement) { throw new Error(""); } if (this.value !== replacement) { this.value = replacement; this.__childCache = null; } for (i = 0; i < count; ++i) { results.push(this.parentPath.get(this.name + i)); } if (results[0] !== this) { throw new Error(""); } } } else if (count === 1) { if (this.value !== replacement) { this.__childCache = null; } this.value = parentValue[this.name] = replacement; results.push(this); } else if (count === 0) { delete parentValue[this.name]; delete this.value; this.__childCache = null; // Leave this path cached as parentCache[this.name], even though // it no longer has a value defined. } else { throw new Error("Could not replace path"); } return results; }; return Path; };