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more work on the demo, looks pretty good
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*.sh text | ||
*.txt text | ||
*.y text | ||
demo/primer.css binary | ||
demo/libwasm.js binary |
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textarea { | ||
width: 100%; | ||
height: 400px; | ||
min-height: 400px; | ||
font-family: monospace; | ||
resize: vertical; | ||
} | ||
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.two-fifths { | ||
width:40%; | ||
} | ||
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.three-fifths { | ||
width:60%; | ||
} | ||
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.container { | ||
width: 1200px; | ||
} |
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/* | ||
* Copyright 2016 WebAssembly Community Group participants | ||
* | ||
* Licensed under the Apache License, Version 2.0 (the "License"); | ||
* you may not use this file except in compliance with the License. | ||
* You may obtain a copy of the License at | ||
* | ||
* http://www.apache.org/licenses/LICENSE-2.0 | ||
* | ||
* Unless required by applicable law or agreed to in writing, software | ||
* distributed under the License is distributed on an "AS IS" BASIS, | ||
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
* See the License for the specific language governing permissions and | ||
* limitations under the License. | ||
*/ | ||
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var defaultIndent = ' '; | ||
var input = document.getElementById('input'); | ||
var output = document.getElementById('output'); | ||
var select = document.getElementById('select'); | ||
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function debounce(f, wait) { | ||
var lastTime = 0; | ||
var timeoutId = -1; | ||
var wrapped = function() { | ||
var time = +new Date(); | ||
if (time - lastTime < wait) { | ||
if (timeoutId == -1) | ||
timeoutId = setTimeout(wrapped, (lastTime + wait) - time); | ||
return; | ||
} | ||
if (timeoutId != -1) | ||
clearTimeout(timeoutId); | ||
timeoutId = -1; | ||
lastTime = time; | ||
f.apply(null, arguments); | ||
}; | ||
return wrapped; | ||
} | ||
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function insertTextAtSelection(input, src) { | ||
var selectionStart = input.selectionStart; | ||
var selectionEnd = input.selectionEnd; | ||
var oldValue = input.value; | ||
input.value = oldValue.slice(0, selectionStart) + src + | ||
oldValue.slice(selectionEnd); | ||
input.selectionStart = input.selectionEnd = selectionStart + src.length; | ||
} | ||
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function onInputKeyDown(e) { | ||
if (e.keyCode == 9) { // tab | ||
insertTextAtSelection(this, defaultIndent); | ||
e.preventDefault(); | ||
} else if (e.keyCode == 13) { // newline | ||
// count nesting depth | ||
var parens = 0; | ||
var lastOpen = -1; | ||
var indent = ''; | ||
for (var i = this.selectionStart - 1; i >= 0; --i) { | ||
var c = this.value[i]; | ||
if (c == '(') { | ||
if (--parens < 0) { | ||
if (lastOpen != -1) | ||
i = lastOpen; | ||
else | ||
indent = defaultIndent; | ||
break; | ||
// find first sibling "(", if any | ||
} else if (parens == 0 && lastOpen == -1) { | ||
lastOpen = i; | ||
} | ||
} else if (c == ')') { | ||
parens++; | ||
} | ||
} | ||
// get column of current nesting | ||
var col = 0; | ||
for (; i > 0; --i) { | ||
var c = this.value[i]; | ||
if (c == '\n') { | ||
col--; // went back too far | ||
break; | ||
} else { | ||
col++; | ||
} | ||
} | ||
// write newline, plus indentation | ||
insertTextAtSelection(this, '\n' + ' '.repeat(col) + indent); | ||
e.preventDefault(); | ||
} | ||
} | ||
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function onError(loc, error, sourceLine, sourceLineColumnOffset) { | ||
var lines = [ | ||
loc.filename + ':' + loc.line + ':' + loc.firstColumn, | ||
error | ||
]; | ||
if (sourceLine.length > 0) { | ||
var numSpaces = loc.firstColumn - 1 - sourceLineColumnOffset; | ||
var numCarets = loc.lastColumn - loc.firstColumn; | ||
lines.push(sourceLine); | ||
lines.push(' '.repeat(numSpaces) + '^'.repeat(numCarets)); | ||
} | ||
output.textContent += lines.join('\n') + '\n'; | ||
} | ||
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var allocator = wasm.LibcAllocator; | ||
var eh = new wasm.SourceErrorHandler(onError, 80); | ||
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function compile(text) { | ||
output.textContent = ''; | ||
try { | ||
var buf = wasm.Buffer.fromString(text); | ||
var lexer = wasm.Lexer.fromBuffer(allocator, 'test.wast', buf); | ||
var script = wasm.parse(lexer, eh); | ||
wasm.checkAst(lexer, script, eh); | ||
var memoryWriter = new wasm.MemoryWriter(allocator); | ||
var jsWriter = new wasm.JSStringWriter(); | ||
var logStream = new wasm.Stream(jsWriter.writer); | ||
var options = new wasm.WriteBinaryOptions({logStream: logStream}); | ||
wasm.writeBinaryScript(allocator, memoryWriter.base, script, options); | ||
output.textContent = jsWriter.string; | ||
} catch (e) { | ||
output.textContent += e.toString(); | ||
} finally { | ||
if (options) | ||
options.$destroy(); | ||
if (logStream) | ||
logStream.$destroy(); | ||
if (script) | ||
script.$destroy(); | ||
if (jsWriter) | ||
jsWriter.$destroy(); | ||
if (memoryWriter) | ||
memoryWriter.$destroy(); | ||
if (lexer) | ||
lexer.$destroy(); | ||
if (buf) | ||
buf.$destroy(); | ||
} | ||
} | ||
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var compileInput = debounce(function() { compile(input.value); }, 100); | ||
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function onInputInput(e) { | ||
compileInput(); | ||
} | ||
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var examples = [ | ||
{ | ||
name: 'empty', | ||
contents: '(module)' | ||
}, | ||
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{ | ||
name: 'simple', | ||
contents: | ||
'(module\n' + | ||
' (func $addTwo (param i32 i32) (result i32)\n' + | ||
' (i32.add\n' + | ||
' (get_local 0)\n' + | ||
' (get_local 1)))\n' + | ||
' (export "addTwo" $addTwo))\n' | ||
}, | ||
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{ | ||
name: 'factorial', | ||
contents: | ||
'(module\n' + | ||
' (func $fac (param i64) (result i64)\n' + | ||
' (if (i64.lt_s (get_local 0) (i64.const 0))\n' + | ||
' (then (i64.const 1))\n' + | ||
' (else\n' + | ||
' (i64.mul\n' + | ||
' (get_local 0)\n' + | ||
' (call $fac\n' + | ||
' (i64.sub\n' + | ||
' (get_local 0)\n' + | ||
' (i64.const 1)))))))\n' + | ||
' (export "fac" $fac))\n' | ||
} | ||
]; | ||
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function setExample(index) { | ||
var contents = examples[index].contents; | ||
input.value = contents; | ||
compileInput(); | ||
} | ||
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function onSelectChanged(e) { | ||
setExample(this.selectedIndex); | ||
} | ||
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input.addEventListener('keydown', onInputKeyDown); | ||
input.addEventListener('input', onInputInput); | ||
select.addEventListener('change', onSelectChanged); | ||
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for (var i = 0; i < examples.length; ++i) { | ||
var example = examples[i]; | ||
var option = document.createElement('option'); | ||
option.textContent = example.name; | ||
select.appendChild(option); | ||
} | ||
select.selectedIndex = 1; | ||
setExample(select.selectedIndex); |
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