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async-execution.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Blockly Demo: Asynchronous Execution with JS-Interpreter</title>
<!-- acorn_interpreter.js is copied from the JS-Interpreter project
without modification. -->
<script src="acorn_interpreter.js"></script>
<script src="./node_modules/blockly/blockly_compressed.js"></script>
<script src="./node_modules/blockly/blocks_compressed.js"></script>
<script src="./node_modules/blockly/javascript_compressed.js"></script>
<script src="./node_modules/blockly/msg/en.js"></script>
<script src="wait_block.js"></script>
<style>
body {
background-color: #fff;
font-family: sans-serif;
}
h1 {
font-weight: normal;
font-size: 140%;
}
</style>
</head>
<body>
<h1>Asynchronous Execution with JS-Interpreter</h1>
<p>This is a demo of executing code asynchronously (e.g., waiting for delays or user input) using the JavaScript interpreter.</p>
<p>→ <a href="https://developers.google.com/blockly/guides/app-integration/running-javascript#js-interpreter">More info on running code with JS-Interpreter</a></p>
<p>
<button onclick="runCode()" id="runButton">Run JavaScript</button>
</p>
<div style="width: 100%">
<div id="blocklyDiv"
style="display: inline-block; height: 480px; width: 58%"></div>
<textarea id="output" disabled="disabled"
style="display: inline-block; height: 480px; width: 38%;">
</textarea>
</div>
<script>
const toolboxJson = {
"contents": [
{
"kind": "CATEGORY",
"name": "Logic",
"colour": "%{BKY_LOGIC_HUE}",
"contents": [
{
"kind": "BLOCK",
"type": "controls_if"
},
{
"kind": "BLOCK",
"type": "logic_compare"
},
{
"kind": "BLOCK",
"type": "logic_operation"
},
{
"kind": "BLOCK",
"type": "logic_negate"
},
{
"kind": "BLOCK",
"type": "logic_boolean"
}
]
},
{
"kind": "CATEGORY",
"name": "Loops",
"colour": "%{BKY_LOOPS_HUE}",
"contents": [
{
"kind": "BLOCK",
"type": "controls_repeat_ext",
"inputs": {
"TIMES": {
"shadow": {
"type": "math_number",
"fields": {"NUM": 10}
}
}
}
},
{
"kind": "BLOCK",
"type": "controls_whileUntil"
},
{
"kind": "BLOCK",
"type": "wait_seconds"
}
]
},
{
"kind": "CATEGORY",
"name": "Math",
"colour": "%{BKY_MATH_HUE}",
"contents": [
{
"kind": "BLOCK",
"type": "math_number"
},
{
"kind": "BLOCK",
"type": "math_arithmetic",
"inputs": {
"A": {
"shadow": {
"type": "math_number",
"fields": {"NUM": 1}
}
},
"B": {
"shadow": {
"type": "math_number",
"fields": {"NUM": 1}
}
}
}
},
{
"kind": "BLOCK",
"type": "math_single",
"inputs": {
"NUM": {
"shadow": {
"type": "math_number",
"fields": {"NUM": 9}
}
}
}
}
]
},
{
"kind": "CATEGORY",
"name": "Text",
"colour": "%{BKY_TEXTS_HUE}",
"contents": [
{
"kind": "BLOCK",
"type": "text"
},
{
"kind": "BLOCK",
"type": "text_length",
"inputs": {
"VALUE": {
"shadow": {
"type": "text",
"fields": {"TEXT": "abc"}
}
}
}
},
{
"kind": "BLOCK",
"type": "text_print",
"inputs": {
"TEXT": {
"shadow": {
"type": "text",
"fields": {"TEXT": "abc"}
}
}
}
},
{
"kind": "BLOCK",
"type": "text_prompt_ext",
"inputs": {
"TEXT": {
"shadow": {
"type": "text",
"fields": {"TEXT": "abc"}
}
}
}
}
]
},
{
"kind": "SEP"
},
{
"kind": "CATEGORY",
"name": "Variables",
"custom": "VARIABLE",
"colour": "%{BKY_VARIABLES_HUE}",
},
{
"kind": "CATEGORY",
"name": "Functions",
"custom": "PROCEDURE",
"colour": "%{BKY_PROCEDURES_HUE}",
}
]
};
const startBlocks = {
"blocks": {
"blocks": [
{
"type": "variables_set",
"x": 20,
"y": 20,
"inline": true,
"fields": {
"VAR": {"id": "n"}
},
"inputs": {
"VALUE": {
"block": {
"type": "math_number",
"fields": {"NUM": 1}
}
}
},
"next": {
"block": {
"type": "controls_repeat_ext",
"inline": true,
"inputs": {
"TIMES": {
"block": {
"type": "math_number",
"fields": {"NUM": 4}
}
},
"DO": {
"block": {
"type": "wait_seconds",
"fields": {"SECONDS": 1},
"next": {
"block": {
"type": "variables_set",
"inline": true,
"fields": {
"VAR": {"id": "n"}
},
"inputs": {
"VALUE": {
"block": {
"type": "math_arithmetic",
"fields": {"OP": "MULTIPLY"},
"inputs": {
"A": {
"block": {
"type": "variables_get",
"fields": {
"VAR": {"id": "n"}
}
}
},
"B": {
"block": {
"type": "math_number",
"fields": {"NUM": 2}
}
}
}
}
}
},
"next": {
"block": {
"type": "text_print",
"inline": false,
"inputs": {
"TEXT": {
"block": {
"type": "variables_get",
"fields": {
"VAR": {"id": "n"}
}
}
}
}
}
}
}
}
}
}
}
}
}
}
]
},
"variables": [
{
"name": "n",
"id": "n"
}
]
};
const demoWorkspace = Blockly.inject('blocklyDiv',
{media: './node_modules/blockly/media/',
toolbox: toolboxJson});
Blockly.JavaScript.STATEMENT_PREFIX = 'highlightBlock(%1);\n';
Blockly.JavaScript.addReservedWords('highlightBlock');
Blockly.serialization.workspaces.load(startBlocks, demoWorkspace)
const outputArea = document.getElementById('output');
const runButton = document.getElementById('runButton');
let myInterpreter = null;
let runnerPid = 0;
function initApi(interpreter, globalObject) {
// Add an API function for the alert() block, generated for "text_print" blocks.
const wrapperAlert = function alert(text) {
text = arguments.length ? text : '';
outputArea.value += '\n' + text;
};
interpreter.setProperty(globalObject, 'alert',
interpreter.createNativeFunction(wrapperAlert));
// Add an API function for the prompt() block.
const wrapperPrompt = function prompt(text) {
return window.prompt(text);
};
interpreter.setProperty(globalObject, 'prompt',
interpreter.createNativeFunction(wrapperPrompt));
// Add an API function for highlighting blocks.
const wrapper = function(id) {
id = String(id || '');
return highlightBlock(id);
};
interpreter.setProperty(globalObject, 'highlightBlock',
interpreter.createNativeFunction(wrapper));
// Add an API for the wait block. See wait_block.js
initInterpreterWaitForSeconds(interpreter, globalObject);
}
function highlightBlock(id) {
demoWorkspace.highlightBlock(id);
}
function resetStepUi(clearOutput) {
clearTimeout(runnerPid);
demoWorkspace.highlightBlock(null);
runButton.disabled = '';
if (clearOutput) {
outputArea.value = 'Program output:\n=================';
}
myInterpreter = null;
}
function runCode() {
if (!myInterpreter) {
// First statement of this code.
// Clear the program output.
resetStepUi(true);
const latestCode = Blockly.JavaScript.workspaceToCode(demoWorkspace);
runButton.disabled = 'disabled';
// And then show generated code in an alert.
// In a timeout to allow the outputArea.value to reset first.
setTimeout(function() {
alert('Ready to execute the following code\n' +
'===================================\n' + latestCode);
// Begin execution
myInterpreter = new Interpreter(latestCode, initApi);
function runner() {
if (myInterpreter) {
const hasMore = myInterpreter.run();
if (hasMore) {
// Execution is currently blocked by some async call.
// Try again later.
runnerPid = setTimeout(runner, 10);
} else {
// Program is complete.
outputArea.value += '\n\n<< Program complete >>';
resetStepUi(false);
}
}
}
runner();
}, 1);
return;
}
}
demoWorkspace.addChangeListener(function(event) {
if (!event.isUiEvent) {
// Something changed. Interpreter needs to be reloaded.
resetStepUi(true);
}
});
</script>
</body>
</html>