mirror of
https://github.com/google/blockly.git
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268 lines
8.9 KiB
HTML
268 lines
8.9 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<title>Blockly Demo: Asynchronous Execution with JS Interpreter</title>
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<script src="acorn_interpreter.js"></script>
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<script src="../../blockly_compressed.js"></script>
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<script src="../../blocks_compressed.js"></script>
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<script src="../../javascript_compressed.js"></script>
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<script src="../../msg/js/en.js"></script>
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<script src="wait_block.js"></script>
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<style>
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body {
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background-color: #fff;
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font-family: sans-serif;
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}
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h1 {
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font-weight: normal;
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font-size: 140%;
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}
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</style>
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</head>
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<body>
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<h1><a href="https://developers.google.com/blockly/">Blockly</a> >
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<a href="../index.html">Demos</a> > Asynchronous Execution with JS Interpreter</h1>
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<p>This is a demo of executing code asynchronously (e.g., waiting for delays or user input) using the JavaScript interpreter.</p>
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<p>→ <a href="https://developers.google.com/blockly/guides/configure-blockly/web/running-javascript#js_interpreter">More info on running code with JS Interpreter</a></p>
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<p>
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<button onclick="runCode()" id="runButton">Run JavaScript</button>
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</p>
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<div style="width: 100%">
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<div id="blocklyDiv"
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style="display: inline-block; height: 480px; width: 58%"></div>
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<textarea id="output" disabled="disabled"
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style="display: inline-block; height: 480px; width: 38%;">
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</textarea>
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</div>
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<xml xmlns="https://developers.google.com/blockly/xml" id="toolbox" style="display: none">
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<category name="Logic" colour="%{BKY_LOGIC_HUE}">
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<block type="controls_if"></block>
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<block type="logic_compare"></block>
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<block type="logic_operation"></block>
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<block type="logic_negate"></block>
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<block type="logic_boolean"></block>
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</category>
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<category name="Loops" colour="%{BKY_LOOPS_HUE}">
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<block type="controls_repeat_ext">
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<value name="TIMES">
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<block type="math_number">
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<field name="NUM">10</field>
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</block>
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</value>
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</block>
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<block type="controls_whileUntil"></block>
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</category>
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<category name="Math" colour="%{BKY_MATH_HUE}">
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<block type="math_number">
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<field name="NUM">123</field>
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</block>
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<block type="math_arithmetic"></block>
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<block type="math_single"></block>
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</category>
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<category name="Text" colour="%{BKY_TEXTS_HUE}">
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<block type="text"></block>
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<block type="text_length"></block>
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<block type="text_print"></block>
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<block type="text_prompt_ext">
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<value name="TEXT">
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<block type="text"></block>
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</value>
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</block>
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</category>
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<sep></sep>
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<category name="Variables" custom="VARIABLE" colour="%{BKY_VARIABLES_HUE}">
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</category>
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<category name="Functions" custom="PROCEDURE" colour="%{BKY_PROCEDURES_HUE}">
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</category>
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</xml>
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<xml xmlns="https://developers.google.com/blockly/xml" id="startBlocks" style="display: none">
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<block type="variables_set" id="set_n_initial" inline="true" x="20" y="20">
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<field name="VAR">n</field>
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<value name="VALUE">
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<block type="math_number">
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<field name="NUM">1</field>
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</block>
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</value>
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<next>
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<block type="controls_repeat_ext" id="repeat" inline="true">
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<value name="TIMES">
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<block type="math_number">
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<field name="NUM">4</field>
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</block>
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</value>
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<statement name="DO">
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<block type="wait_seconds" id="wait">
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<field name="SECONDS">1.0</field>
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<next>
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<block type="variables_set" id="set_n_update" inline="true">
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<field name="VAR">n</field>
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<value name="VALUE">
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<block type="math_arithmetic" inline="true">
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<field name="OP">MULTIPLY</field>
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<value name="A">
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<block type="variables_get">
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<field name="VAR">n</field>
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</block>
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</value>
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<value name="B">
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<block type="math_number">
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<field name="NUM">2</field>
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</block>
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</value>
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</block>
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</value>
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<next>
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<block type="text_print" id="print" inline="false">
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<value name="TEXT">
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<block type="variables_get">
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<field name="VAR">n</field>
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</block>
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</value>
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</block>
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</next>
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</block>
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</next>
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</block>
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</statement>
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</block>
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</next>
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</block>
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</xml>
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<script>
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var demoWorkspace = Blockly.inject('blocklyDiv',
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{media: '../../media/',
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toolbox: document.getElementById('toolbox')});
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Blockly.Xml.domToWorkspace(document.getElementById('startBlocks'),
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demoWorkspace);
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// Exit is used to signal the end of a script.
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Blockly.JavaScript.addReservedWords('exit');
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var outputArea = document.getElementById('output');
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var runButton = document.getElementById('runButton');
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var myInterpreter = null;
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var runner;
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function initApi(interpreter, globalObject) {
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// Add an API function for the alert() block, generated for "text_print" blocks.
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var wrapper = function(text) {
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text = text ? text.toString() : '';
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outputArea.value = outputArea.value + '\n' + text;
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};
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interpreter.setProperty(globalObject, 'alert',
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interpreter.createNativeFunction(wrapper));
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// Add an API function for the prompt() block.
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var wrapper = function(text) {
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text = text ? text.toString() : '';
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return interpreter.createPrimitive(prompt(text));
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};
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interpreter.setProperty(globalObject, 'prompt',
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interpreter.createNativeFunction(wrapper));
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// Add an API for the wait block. See wait_block.js
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initInterpreterWaitForSeconds(interpreter, globalObject);
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// Add an API function for highlighting blocks.
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var wrapper = function(id) {
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id = id ? id.toString() : '';
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return interpreter.createPrimitive(highlightBlock(id));
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};
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interpreter.setProperty(globalObject, 'highlightBlock',
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interpreter.createNativeFunction(wrapper));
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}
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var highlightPause = false;
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var latestCode = '';
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function highlightBlock(id) {
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demoWorkspace.highlightBlock(id);
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highlightPause = true;
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}
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function resetStepUi(clearOutput) {
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demoWorkspace.highlightBlock(null);
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highlightPause = false;
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runButton.disabled = '';
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if (clearOutput) {
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outputArea.value = 'Program output:\n=================';
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}
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}
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function generateCodeAndLoadIntoInterpreter() {
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// Generate JavaScript code and parse it.
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Blockly.JavaScript.STATEMENT_PREFIX = 'highlightBlock(%1);\n';
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Blockly.JavaScript.addReservedWords('highlightBlock');
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latestCode = Blockly.JavaScript.workspaceToCode(demoWorkspace);
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resetStepUi(true);
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}
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function resetInterpreter() {
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myInterpreter = null;
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if (runner) {
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clearTimeout(runner);
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runner = null;
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}
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}
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function runCode() {
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if (!myInterpreter) {
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// First statement of this code.
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// Clear the program output.
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resetStepUi(true);
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runButton.disabled = 'disabled';
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// And then show generated code in an alert.
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// In a timeout to allow the outputArea.value to reset first.
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setTimeout(function() {
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alert('Ready to execute the following code\n' +
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'===================================\n' +
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latestCode);
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// Begin execution
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highlightPause = false;
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myInterpreter = new Interpreter(latestCode, initApi);
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runner = function() {
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if (myInterpreter) {
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var hasMore = myInterpreter.run();
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if (hasMore) {
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// Execution is currently blocked by some async call.
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// Try again later.
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setTimeout(runner, 10);
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} else {
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// Program is complete.
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outputArea.value += '\n\n<< Program complete >>';
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resetInterpreter();
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resetStepUi(false);
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}
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}
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};
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runner();
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}, 1);
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return;
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}
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}
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// Load the interpreter now, and upon future changes.
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generateCodeAndLoadIntoInterpreter();
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demoWorkspace.addChangeListener(function(event) {
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if (!(event instanceof Blockly.Events.Ui)) {
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// Something changed. Parser needs to be reloaded.
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resetInterpreter();
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generateCodeAndLoadIntoInterpreter();
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}
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});
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</script>
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</body>
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</html>
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