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398 lines (361 loc) · 11.9 KB
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/**
* Blockly Demos: Code
*
* Copyright 2012 Google Inc.
* https://developers.google.com/blockly/
*
* 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.
*/
/**
* @fileoverview JavaScript for Blockly's Code demo.
* @author fraser@google.com (Neil Fraser)
*/
'use strict';
/**
* Create a namespace for the application.
*/
var Code = {};
Code.Lang = 'en';
/**
* Lookup for names of supported languages. Keys should be in ISO 639 format.
*/
Code.LANGUAGE_NAME = {
'en': 'English',
};
/**
* Blockly's main workspace.
* @type {Blockly.WorkspaceSvg}
*/
Code.workspace = null;
/**
* Extracts a parameter from the URL.
* If the parameter is absent default_value is returned.
* @param {string} name The name of the parameter.
* @param {string} defaultValue Value to return if paramater not found.
* @return {string} The parameter value or the default value if not found.
*/
Code.getStringParamFromUrl = function(name, defaultValue) {
var val = location.search.match(new RegExp('[?&]' + name + '=([^&]+)'));
return val ? decodeURIComponent(val[1].replace(/\+/g, '%20')) : defaultValue;
};
/**
* Get the language of this user from the URL.
* @return {string} User's language.
*/
Code.getLang = function() {
return 'en';
};
/**
* Load blocks saved on App Engine Storage or in session/local storage.
* @param {string} defaultXml Text representation of default blocks.
*/
Code.loadBlocks = function(defaultXml) {
try {
var loadOnce = window.sessionStorage.loadOnceBlocks;
} catch(e) {
// Firefox sometimes throws a SecurityError when accessing sessionStorage.
// Restarting Firefox fixes this, so it looks like a bug.
var loadOnce = null;
}
if ('BlocklyStorage' in window && window.location.hash.length > 1) {
// An href with #key trigers an AJAX call to retrieve saved blocks.
BlocklyStorage.retrieveXml(window.location.hash.substring(1));
} else if (loadOnce) {
// Language switching stores the blocks during the reload.
delete window.sessionStorage.loadOnceBlocks;
var xml = Blockly.Xml.textToDom(loadOnce);
Blockly.Xml.domToWorkspace(xml, Code.workspace);
} else if (defaultXml) {
// Load the editor with default starting blocks.
var xml = Blockly.Xml.textToDom(defaultXml);
Blockly.Xml.domToWorkspace(xml, Code.workspace);
} else if ('BlocklyStorage' in window) {
// Restore saved blocks in a separate thread so that subsequent
// initialization is not affected from a failed load.
window.setTimeout(BlocklyStorage.restoreBlocks, 0);
}
};
/**
* Bind a function to a button's click event.
* On touch enabled browsers, ontouchend is treated as equivalent to onclick.
* @param {!Element|string} el Button element or ID thereof.
* @param {!Function} func Event handler to bind.
*/
Code.bindClick = function(el, func) {
if (typeof el == 'string') {
el = document.getElementById(el);
}
el.addEventListener('click', func, true);
el.addEventListener('touchend', func, true);
};
/**
* Load the Prettify CSS and JavaScript.
*/
Code.importPrettify = function() {
//<link rel="stylesheet" href="../prettify.css">
//<script src="../prettify.js"></script>
var link = document.createElement('link');
link.setAttribute('rel', 'stylesheet');
link.setAttribute('href', 'demos/prettify.css');
document.head.appendChild(link);
var script = document.createElement('script');
script.setAttribute('src', 'demos/prettify.js');
document.head.appendChild(script);
};
/**
* Compute the absolute coordinates and dimensions of an HTML element.
* @param {!Element} element Element to match.
* @return {!Object} Contains height, width, x, and y properties.
* @private
*/
Code.getBBox_ = function(element) {
var height = element.offsetHeight;
var width = element.offsetWidth;
var x = 0;
var y = 0;
do {
x += element.offsetLeft;
y += element.offsetTop;
element = element.offsetParent;
} while (element);
return {
height: height,
width: width,
x: x,
y: y
};
};
/**
* User's language (e.g. "en").
* @type {string}
*/
Code.LANG = Code.getLang();
/**
* List of tab names.
* @private
*/
Code.TABS_ = ['blocks', 'javascript', 'python', 'xml'];
Code.selected = 'blocks';
/**
* Switch the visible pane when a tab is clicked.
* @param {string} clickedName Name of tab clicked.
*/
Code.tabClick = function(clickedName) {
// If the XML tab was open, save and render the content.
if (document.getElementById('tab_xml').className == 'tabon') {
var xmlTextarea = document.getElementById('content_xml');
var xmlText = xmlTextarea.value;
var xmlDom = null;
try {
xmlDom = Blockly.Xml.textToDom(xmlText);
} catch (e) {
var q =
window.confirm(MSG['badXml'].replace('%1', e));
if (!q) {
// Leave the user on the XML tab.
return;
}
}
if (xmlDom) {
Code.workspace.clear();
Blockly.Xml.domToWorkspace(xmlDom, Code.workspace);
}
}
if (document.getElementById('tab_blocks').className == 'tabon') {
Code.workspace.setVisible(false);
}
// Deselect all tabs and hide all panes.
for (var i = 0; i < Code.TABS_.length; i++) {
var name = Code.TABS_[i];
document.getElementById('tab_' + name).className = 'taboff';
document.getElementById('content_' + name).style.visibility = 'hidden';
}
// Select the active tab.
Code.selected = clickedName;
document.getElementById('tab_' + clickedName).className = 'tabon';
// Show the selected pane.
document.getElementById('content_' + clickedName).style.visibility =
'visible';
Code.renderContent();
if (clickedName == 'blocks') {
Code.workspace.setVisible(true);
}
Blockly.svgResize(Code.workspace);
};
/**
* Populate the currently selected pane with content generated from the blocks.
*/
Code.renderContent = function() {
var content = document.getElementById('content_' + Code.selected);
// Initialize the pane.
if (content.id == 'content_xml') {
var xmlTextarea = document.getElementById('content_xml');
var xmlDom = Blockly.Xml.workspaceToDom(Code.workspace);
var xmlText = Blockly.Xml.domToPrettyText(xmlDom);
xmlTextarea.value = xmlText;
xmlTextarea.focus();
} else if (content.id == 'content_javascript') {
var code = "// BROBOT code\n";
code += "var STEPSMETER="+STEPSMETER+";\nvar STEPSTURN="+STEPSTURN+";\n\n";
code += Blockly.JavaScript.workspaceToCode(Code.workspace);
content.textContent = code;
if (typeof prettyPrintOne == 'function') {
code = content.innerHTML;
code = prettyPrintOne(code, 'js');
content.innerHTML = code;
}
} else if (content.id == 'content_python') {
// Add python Initialization code
code = '# PYTHON BROBOT CODE\n';
code +='import time\nfrom BROBOT_Class import BROBOT\n';
code += 'myRobot = BROBOT()\n\n';
code += Blockly.Python.workspaceToCode(Code.workspace);
content.textContent = code;
if (typeof prettyPrintOne == 'function') {
code = content.innerHTML;
code = prettyPrintOne(code, 'py');
content.innerHTML = code;
}
}
};
/**
* Initialize Blockly. Called on page load.
*/
Code.init = function() {
$( function() {
$( "#dialog" ).dialog();
} );
Code.initLanguage();
var container = document.getElementById('content_area');
var onresize = function(e) {
var bBox = Code.getBBox_(container);
for (var i = 0; i < Code.TABS_.length; i++) {
var el = document.getElementById('content_' + Code.TABS_[i]);
el.style.top = bBox.y + 'px';
el.style.left = bBox.x + 'px';
// Height and width need to be set, read back, then set again to
// compensate for scrollbars.
el.style.height = bBox.height + 'px';
el.style.height = (2 * bBox.height - el.offsetHeight) + 'px';
el.style.width = bBox.width + 'px';
el.style.width = (2 * bBox.width - el.offsetWidth) + 'px';
}
// Make the 'Blocks' tab line up with the toolbox.
if (Code.workspace && Code.workspace.toolbox_.width) {
document.getElementById('tab_blocks').style.minWidth =
(Code.workspace.toolbox_.width - 38) + 'px';
// Account for the 19 pixel margin and on each side.
}
};
window.addEventListener('resize', onresize, false);
// Interpolate translated messages into toolbox.
var toolboxText = document.getElementById('toolbox').outerHTML;
toolboxText = toolboxText.replace(/{(\w+)}/g,
function(m, p1) {return MSG[p1]});
var toolboxXml = Blockly.Xml.textToDom(toolboxText);
Code.workspace = Blockly.inject('content_blocks',
{grid:
{spacing: 25,
length: 3,
colour: '#ccc',
snap: true},
media: 'media/',
toolbox: toolboxXml,
zoom:
{controls: true,
wheel: true}
});
// Add to reserved word list: Local variables in execution environment (runJS)
// and the infinite loop detection function.
// Blockly.JavaScript.addReservedWords('code,timeouts,checkTimeout');
Code.loadBlocks('');
if ('BlocklyStorage' in window) {
// Hook a save function onto unload.
BlocklyStorage.backupOnUnload(Code.workspace);
}
Code.tabClick(Code.selected);
Code.bindClick('trashButton',
function() {Code.discard(); Code.renderContent();});
Code.bindClick('runButton', Code.runJS);
// Disable the link button if page isn't backed by App Engine storage.
var linkButton = document.getElementById('linkButton');
if ('BlocklyStorage' in window) {
BlocklyStorage['HTTPREQUEST_ERROR'] = MSG['httpRequestError'];
BlocklyStorage['LINK_ALERT'] = MSG['linkAlert'];
BlocklyStorage['HASH_ERROR'] = MSG['hashError'];
BlocklyStorage['XML_ERROR'] = MSG['xmlError'];
Code.bindClick(linkButton,
function() {BlocklyStorage.link(Code.workspace);});
} else if (linkButton) {
linkButton.className = 'disabled';
}
for (var i = 0; i < Code.TABS_.length; i++) {
var name = Code.TABS_[i];
Code.bindClick('tab_' + name,
function(name_) {return function() {Code.tabClick(name_);};}(name));
}
onresize();
Blockly.svgResize(Code.workspace);
// Lazy-load the syntax-highlighting.
window.setTimeout(Code.importPrettify, 1);
};
/**
* Initialize the page language.
*/
Code.initLanguage = function() {
document.head.parentElement.setAttribute('lang', 'en');
// Inject language strings.
document.title += ' ' + 'title';
document.getElementById('tab_blocks').textContent = 'blocks';
document.getElementById('linkButton').title = 'link';
document.getElementById('runButton').title = 'run';
document.getElementById('trashButton').title = 'trash';
};
/**
* Execute the user's code.
* Just a quick and dirty eval. Catch infinite loops.
*/
Code.runJS = function() {
console.log('run code...');
Blockly.JavaScript.INFINITE_LOOP_TRAP = ' checkTimeout();\n';
var timeouts = 0;
var checkTimeout = function() {
if (timeouts++ > 1000000) {
throw MSG['timeout'];
}
};
var code = Blockly.JavaScript.workspaceToCode(Code.workspace);
Blockly.JavaScript.INFINITE_LOOP_TRAP = null;
console.log(code);
eval(code);
//try {
// eval(code);
//} catch (e) {
// console.log('Code error...');
//alert(MSG['badCode'].replace('%1', e));
//}
};
/**
* Discard all blocks from the workspace.
*/
Code.discard = function() {
var count = Code.workspace.getAllBlocks().length;
if (count < 2 ||
window.confirm(Blockly.Msg.DELETE_ALL_BLOCKS.replace('%1', count))) {
Code.workspace.clear();
if (window.location.hash) {
window.location.hash = '';
}
}
};
window.addEventListener('load', Code.init);
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