mirror of
https://github.com/google/blockly.git
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201 lines
6.3 KiB
HTML
201 lines
6.3 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: 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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<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> > JS Interpreter</h1>
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<p>This is a simple demo of executing code with a sandboxed JavaScript interpreter.</p>
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<p>→ More info on <a href="https://developers.google.com/blockly/guides/configure-blockly/web/running-javascript#js_interpreter">JS Interpreter</a>…</p>
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<p>
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<button onclick="parseCode()">Parse JavaScript</button>
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<button onclick="stepCode()" id="stepButton" disabled="disabled">Step JavaScript</button>
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</p>
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<div id="blocklyDiv" style="height: 480px; width: 600px;"></div>
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<xml id="toolbox" style="display: none">
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<category name="Logic">
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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">
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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">
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<block type="math_number"></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">
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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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<category name="Variables" custom="VARIABLE"></category>
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<category name="Functions" custom="PROCEDURE"></category>
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</xml>
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<xml id="startBlocks" style="display: none">
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<block type="variables_set" 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" 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="variables_set" 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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</block>
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</statement>
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<next>
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<block type="text_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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</xml>
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<script>
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var workspace = 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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workspace);
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var myInterpreter = null;
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function initApi(interpreter, scope) {
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// Add an API function for the alert() block.
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var wrapper = function(text) {
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text = text ? text.toString() : '';
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return interpreter.createPrimitive(alert(text));
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};
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interpreter.setProperty(scope, '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(scope, 'prompt',
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interpreter.createNativeFunction(wrapper));
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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(scope, 'highlightBlock',
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interpreter.createNativeFunction(wrapper));
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}
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var highlightPause = false;
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function highlightBlock(id) {
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workspace.highlightBlock(id);
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highlightPause = true;
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}
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function parseCode() {
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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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var code = Blockly.JavaScript.workspaceToCode(workspace);
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myInterpreter = new Interpreter(code, initApi);
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alert('Ready to execute this code:\n\n' + code);
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document.getElementById('stepButton').disabled = '';
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highlightPause = false;
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workspace.traceOn(true);
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workspace.highlightBlock(null);
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}
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function stepCode() {
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try {
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var ok = myInterpreter.step();
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} finally {
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if (!ok) {
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// Program complete, no more code to execute.
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document.getElementById('stepButton').disabled = 'disabled';
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return;
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}
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}
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if (highlightPause) {
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// A block has been highlighted. Pause execution here.
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highlightPause = false;
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} else {
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// Keep executing until a highlight statement is reached.
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stepCode();
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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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