mirror of
https://github.com/scratchfoundation/scratch-html5.git
synced 2024-12-11 00:02:22 -05:00
171 lines
6.2 KiB
JavaScript
171 lines
6.2 KiB
JavaScript
// Copyright (C) 2013 Massachusetts Institute of Technology
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License version 2,
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// as published by the Free Software Foundation.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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'use strict';
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var VarListPrims = function() {}
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VarListPrims.prototype.addPrimsTo = function(primTable) {
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// Variable primitives
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primTable['readVariable'] = this.primReadVar;
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primTable['setVar:to:'] = this.primSetVar;
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primTable['changeVar:by:'] = this.primChangeVar;
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primTable['hideVariable:'] = this.primHideVar;
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primTable['showVariable:'] = this.primShowVar;
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// List primitives
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primTable['append:toList:'] = this.primListAppend;
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primTable['deleteLine:ofList:'] = this.primListDeleteLine;
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primTable['insert:at:ofList:'] = this.primListInsertAt;
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primTable['setLine:ofList:to:'] = this.primListSetLine;
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primTable['lineCountOfList:'] = this.primListLength;
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primTable['getLine:ofList:'] = this.primListGetLine;
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primTable['list:contains:'] = this.primListContains;
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}
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// Variable primitive implementations
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VarListPrims.prototype.primReadVar = function(b) {
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var s = interp.targetSprite();
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if (s == null) return;
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var targetVar = interp.arg(b, 0);
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if (targetVar in s.variables)
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return s.variables[targetVar];
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else if (targetVar in runtime.stage.variables)
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return runtime.stage.variables[targetVar];
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}
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VarListPrims.prototype.primSetVar = function(b) {
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var s = interp.targetSprite();
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if (s == null) return;
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var targetVar = interp.arg(b, 0);
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if (targetVar in s.variables)
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s.variables[targetVar] = interp.arg(b, 1);
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else if (targetVar in runtime.stage.variables)
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runtime.stage.variables[targetVar] = interp.arg(b, 1);
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}
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VarListPrims.prototype.primChangeVar = function(b) {
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var s = interp.targetSprite();
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if (s == null) return;
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var targetVar = interp.arg(b, 0);
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if (targetVar in s.variables) {
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s.variables[targetVar] = parseFloat(s.variables[targetVar]);
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s.variables[targetVar] += interp.arg(b, 1);
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} else if (targetVar in runtime.stage.variables) {
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runtime.stage.variables[targetVar] = parseFloat(runtime.stage.variables[targetVar]);
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runtime.stage.variables[targetVar] += interp.arg(b, 1);
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}
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}
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VarListPrims.prototype.primHideVar = function(b) {
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var targetVar = interp.arg(b, 0);
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for (var r = 0; r < runtime.reporters.length; r++) {
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if (runtime.reporters[r].cmd == 'getVar:' && runtime.reporters[r].param == targetVar) {
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runtime.reporters[r].visible = false;
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return;
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}
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}
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}
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VarListPrims.prototype.primShowVar = function(b) {
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var targetVar = interp.arg(b, 0);
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for (var r = 0; r < runtime.reporters.length; r++) {
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if (runtime.reporters[r].cmd == 'getVar:' && runtime.reporters[r].param == targetVar) {
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runtime.reporters[r].visible = true;
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return;
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}
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}
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}
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// List primitive implementations
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// Take a list name and target sprite and return the JS list itself
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var findList = function(targetSprite, listName) {
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if (targetSprite == null) targetSprite = runtime.stage;
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if (listName in targetSprite.lists) {
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return targetSprite.lists[listName].contents;
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} else if (listName in runtime.stage.lists) {
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return runtime.stage.lists[listName].contents;
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}
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return null;
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}
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VarListPrims.prototype.primListAppend = function(b) {
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var list = findList(interp.targetSprite(), interp.arg(b, 1));
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if (list) list.push(interp.arg(b, 0));
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}
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VarListPrims.prototype.primListDeleteLine = function(b) {
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var list = findList(interp.targetSprite(), interp.arg(b, 1));
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if (!list) return;
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var line = interp.arg(b, 0);
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if (line == 'all' || list.length == 0) list.length = 0;
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else if (line == 'last') list.splice(list.length - 1, 1);
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else if (parseInt(line) - 1 in list) list.splice(parseInt(line) - 1, 1);
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}
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VarListPrims.prototype.primListInsertAt = function(b) {
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var list = findList(interp.targetSprite(), interp.arg(b, 2));
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if (!list) return;
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var newItem = interp.arg(b, 0);
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var position = interp.arg(b, 1);
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if (position == 'last') position = list.length;
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else if (position == 'random') position = Math.round(Math.random() * list.length);
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else position = parseInt(position) - 1;
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if (position > list.length) return;
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list.splice(position, 0, newItem);
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}
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VarListPrims.prototype.primListSetLine = function(b) {
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var list = findList(interp.targetSprite(), interp.arg(b, 1));
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if (!list) return;
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var newItem = interp.arg(b, 2);
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var position = interp.arg(b, 0);
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if (position == 'last') position = list.length - 1;
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else if (position == 'random') position = Math.floor(Math.random() * list.length);
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else position = parseInt(position) - 1;
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if (position > list.length - 1) return;
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list[position] = newItem;
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}
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VarListPrims.prototype.primListLength = function(b) {
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var list = findList(interp.targetSprite(), interp.arg(b, 0));
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if (!list) return 0;
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return list.length;
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}
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VarListPrims.prototype.primListGetLine = function(b) {
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var list = findList(interp.targetSprite(), interp.arg(b, 1));
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if (!list) return 0;
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var line = interp.arg(b, 0);
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if (list.length == 0) return 0;
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if (line == 'random') line = Math.round(Math.random() * list.length);
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else if (line == 'last') line = list.length;
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else if (list.length < line) return 0;
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return list[line - 1];
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}
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VarListPrims.prototype.primListContains = function(b) {
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var list = findList(interp.targetSprite(), interp.arg(b, 0));
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if (!list) return 0;
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var searchItem = interp.arg(b, 1);
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if (parseFloat(searchItem) == searchItem) searchItem = parseFloat(searchItem);
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return $.inArray(searchItem, list) > -1;
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}
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