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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,
});
javascript.javascriptGenerator.STATEMENT_PREFIX = 'highlightBlock(%1);\n';
javascript.javascriptGenerator.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 =
javascript.javascriptGenerator.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>