106 lines
2.6 KiB
JavaScript
106 lines
2.6 KiB
JavaScript
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// Represents a simplistic (non-contextual) change. Represents the removal or
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// addition of an element from either the old or the new sequenced enumerable.
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var Change = exports.Change = function(action, position, element) {
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this.action = action;
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this.position = position;
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this.element = element;
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}
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Change.from_a = function(arr) {
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return new Change(arr[0], arr[1], arr[2]);
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}
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Change.prototype.to_a = function() {
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return [this.action, this.position, this.element];
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}
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Change.prototype.is_deleting = function() {
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return this.action == '-';
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}
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Change.prototype.is_adding = function() {
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return this.action == '+';
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}
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Change.prototype.is_unchanged = function() {
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return this.action == '=';
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}
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Change.prototype.is_changed = function() {
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return this.changed == '!';
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}
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Change.prototype.is_finished_a = function() {
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return this.changed == '>';
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}
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Change.prototype.is_finished_b = function() {
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return this.changed == '<';
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}
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var ContextChange = exports.ContextChange = function(action, old_position, old_element, new_position, new_element) {
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this.action = action;
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this.old_position = old_position;
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this.old_element = old_element;
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this.new_position = new_position;
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this.new_element = new_element;
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}
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// Creates a ContextChange from an array produced by ContextChange#to_a.
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ContextChange.from_a = function(arr) {
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if(arr.length == 5) {
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return new ContextChange(arr[0], arr[1], arr[2], arr[3], arr[4]);
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} else {
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return new ContextChange(arr[0], arr[1][0], arr[1][1], arr[2][0], arr[2][1]);
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}
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}
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// Simplifies a context change for use in some diff callbacks. '<' actions
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// are converted to '-' and '>' actions are converted to '+'.
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ContextChange.simplify = function(event) {
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var ea = event.to_a();
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if(ea[0] == '-') {
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ea[2][1] = null;
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} else if(ea[0] == '<') {
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ea[0] = '-';
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ea[2][1] = null;
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} else if(ea[0] == '+') {
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ea[1][1] = null;
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} else if(ea[0] == '>') {
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ea[0] = '+';
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ea[1][1] = null;
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}
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// Return a Context Change object
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return ContextChange.from_a(ea);
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}
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ContextChange.prototype.to_a = function() {
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return [this.action, [this.old_position, this.old_element], [this.new_position, this.new_element]];
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}
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ContextChange.prototype.is_deleting = function() {
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return this.action == '-';
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}
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ContextChange.prototype.is_adding = function() {
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return this.action == '+';
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}
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ContextChange.prototype.is_unchanged = function() {
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return this.action == '=';
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}
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ContextChange.prototype.is_changed = function() {
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return this.changed == '!';
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}
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ContextChange.prototype.is_finished_a = function() {
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return this.changed == '>';
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}
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ContextChange.prototype.is_finished_b = function() {
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return this.changed == '<';
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}
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