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step-execution.html
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<!doctype html>
<html>
<head>
<meta charset="utf-8" />
<title>Blockly Demo: Step Execution with JS-Interpreter</title>
<script src="toolbox.js"></script>
<!-- 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>
<style>
body {
background-color: #fff;
font-family: sans-serif;
}
h1 {
font-weight: normal;
font-size: 140%;
}
</style>
</head>
<body>
<h1>Step Execution with JS-Interpreter</h1>
<p>
This is a demo of executing code step-by-step with a sandboxed JavaScript
interpreter.
</p>
<p>
The generator's
<code>javascript.javascriptGenerator.STATEMENT_PREFIX</code> is assigned
<code>'highlightBlock(%1);\n'</code>, where <code>%1</code> is the block
ID. The call to <code>highlightBlock()</code> will highlight the
identified block and set the variable <code>highlightPause</code> to
<code>true</code>.
</p>
<p>
Each press of the "Step JavaScript" button will run the interpreter one
step after another until <code>highlightPause</code> is true. That is,
until <code>highlightBlock()</code> has highlighted the block that will be
executed on the next step.
</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="stepCode()" id="stepButton">Step 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 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: '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',
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 stepButton = document.getElementById('stepButton');
let myInterpreter = null;
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 wrapperHighlight = function (id) {
id = String(id || '');
return highlightBlock(id);
};
interpreter.setProperty(
globalObject,
'highlightBlock',
interpreter.createNativeFunction(wrapperHighlight),
);
}
// Each step will run the interpreter until the highlightPause is true.
let highlightPause = false;
function highlightBlock(id) {
demoWorkspace.highlightBlock(id);
highlightPause = true;
}
function resetStepUi(clearOutput) {
demoWorkspace.highlightBlock(null);
highlightPause = false;
if (clearOutput) {
outputArea.value = 'Program output:\n=================';
}
myInterpreter = null;
}
function stepCode() {
if (!myInterpreter) {
// First statement of this code.
// Clear the program output.
resetStepUi(true);
const latestCode =
javascript.javascriptGenerator.workspaceToCode(demoWorkspace);
myInterpreter = new Interpreter(latestCode, initApi);
// 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,
);
highlightPause = true;
stepCode();
}, 1);
return;
}
highlightPause = false;
let hasMoreCode;
do {
try {
hasMoreCode = myInterpreter.step();
} finally {
if (!hasMoreCode) {
// Program complete, no more code to execute.
outputArea.value += '\n\n<< Program complete >>';
resetStepUi(false);
// Cool down, to discourage accidentally restarting the program.
stepButton.disabled = 'disabled';
setTimeout(function () {
stepButton.disabled = '';
}, 2000);
return;
}
}
// Keep executing until a highlight statement is reached,
// or the code completes or errors.
} while (hasMoreCode && !highlightPause);
}
demoWorkspace.addChangeListener(function (event) {
if (!event.isUiEvent) {
// Something changed. Interpreter needs to be reloaded.
resetStepUi(true);
}
});
</script>
</body>
</html>