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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>WAVE/FORM — verilog logic analyzer</title>
<link rel="preconnect" href="https://fonts.googleapis.com">
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--bg:#0b0e13; --panel:#10141b; --panel2:#141a24; --line:#1e2531;
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#parseErr.show{display:block}
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/* ---------- wave pane ---------- */
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.tagline{display:none}
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</style>
</head>
<body>
<header>
<div class="wordmark">WAVE<span class="slash">/</span>FORM</div>
<div class="tagline">verilog subset · peggy-generated parser · three.js raster</div>
<div class="spacer"></div>
<div class="ctrl">
<label for="cycles">CYCLES</label>
<input id="cycles" type="number" min="1" max="4000" value="96">
</div>
<button id="run" title="Ctrl+Enter">RUN</button>
<button id="fit" class="ghost">FIT</button>
<div id="status"></div>
</header>
<main>
<section id="editorPane">
<div class="paneHead">SOURCE <span class="k">— assign / always @(posedge) / if-else / NBA & BA / sized literals / selects / concat</span></div>
<textarea id="src" spellcheck="false" aria-label="Verilog source"></textarea>
<div id="parseErr"></div>
</section>
<div id="dragbar" role="separator" aria-orientation="vertical"></div>
<section id="wavePane">
<div id="measure">
<span><span class="lbl">CURSOR </span><span id="tCursor">—</span></span>
<span><span class="lbl">MARKER </span><span id="tMarker">—</span></span>
<span><span class="lbl">Δ </span><span id="tDelta">—</span></span>
<span class="hint">wheel: zoom · drag: pan · click: drop marker · click value: radix</span>
</div>
<div id="waveBody">
<div id="gutter"><div id="gutterScroll"></div></div>
<div id="canvasWrap">
<div id="labels"></div>
<div id="emptyMsg">RUN to simulate</div>
</div>
</div>
</section>
</main>
<script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/r128/three.min.js"></script>
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var peg$r0 = /^[0-9]/;
var peg$r1 = /^[bBhHdDoO]/;
var peg$r2 = /^[0-9a-fA-FxXzZ_?]/;
var peg$r3 = /^[0-9a-fA-F_]/;
var peg$r4 = /^[0-9_]/;
var peg$r5 = /^[a-zA-Z_]/;
var peg$r6 = /^[a-zA-Z0-9_$]/;
var peg$r7 = /^[ \t\r\n]/;
var peg$r8 = /^[^\n]/;
var peg$e0 = peg$literalExpectation(";", false);
var peg$e1 = peg$literalExpectation("(", false);
var peg$e2 = peg$literalExpectation(",", false);
var peg$e3 = peg$literalExpectation(")", false);
var peg$e4 = peg$literalExpectation("=", false);
var peg$e5 = peg$literalExpectation("[", false);
var peg$e6 = peg$literalExpectation(":", false);
var peg$e7 = peg$literalExpectation("]", false);
var peg$e8 = peg$literalExpectation("@", false);
var peg$e9 = peg$literalExpectation("<=", false);
var peg$e10 = peg$literalExpectation("?", false);
var peg$e11 = peg$literalExpectation("||", false);
var peg$e12 = peg$literalExpectation("&&", false);
var peg$e13 = peg$literalExpectation("|", false);
var peg$e14 = peg$literalExpectation("^", false);
var peg$e15 = peg$literalExpectation("~", false);
var peg$e16 = peg$literalExpectation("&", false);
var peg$e17 = peg$literalExpectation("==", false);
var peg$e18 = peg$literalExpectation("!=", false);
var peg$e19 = peg$literalExpectation(">=", false);
var peg$e20 = peg$literalExpectation("<", false);
var peg$e21 = peg$literalExpectation(">", false);
var peg$e22 = peg$literalExpectation("<<", false);
var peg$e23 = peg$literalExpectation(">>", false);
var peg$e24 = peg$literalExpectation("+", false);
var peg$e25 = peg$literalExpectation("-", false);
var peg$e26 = peg$literalExpectation("*", false);
var peg$e27 = peg$literalExpectation("/", false);
var peg$e28 = peg$literalExpectation("%", false);
var peg$e29 = peg$literalExpectation("!", false);
var peg$e30 = peg$literalExpectation("{", false);
var peg$e31 = peg$literalExpectation("}", false);
var peg$e32 = peg$classExpectation([["0", "9"]], false, false);
var peg$e33 = peg$literalExpectation("'", false);
var peg$e34 = peg$classExpectation(["b", "B", "h", "H", "d", "D", "o", "O"], false, false);
var peg$e35 = peg$classExpectation([["0", "9"], ["a", "f"], ["A", "F"], "x", "X", "z", "Z", "_", "?"], false, false);
var peg$e36 = peg$classExpectation([["0", "9"], ["a", "f"], ["A", "F"], "_"], false, false);
var peg$e37 = peg$classExpectation([["0", "9"], "_"], false, false);
var peg$e38 = peg$classExpectation([["a", "z"], ["A", "Z"], "_"], false, false);
var peg$e39 = peg$classExpectation([["a", "z"], ["A", "Z"], ["0", "9"], "_", "$"], false, false);
var peg$e40 = peg$literalExpectation("module", false);
var peg$e41 = peg$literalExpectation("endmodule", false);
var peg$e42 = peg$literalExpectation("input", false);
var peg$e43 = peg$literalExpectation("output", false);
var peg$e44 = peg$literalExpectation("inout", false);
var peg$e45 = peg$literalExpectation("wire", false);
var peg$e46 = peg$literalExpectation("reg", false);
var peg$e47 = peg$literalExpectation("assign", false);
var peg$e48 = peg$literalExpectation("always", false);
var peg$e49 = peg$literalExpectation("begin", false);
var peg$e50 = peg$literalExpectation("end", false);
var peg$e51 = peg$literalExpectation("if", false);
var peg$e52 = peg$literalExpectation("else", false);
var peg$e53 = peg$literalExpectation("posedge", false);
var peg$e54 = peg$literalExpectation("negedge", false);
var peg$e55 = peg$literalExpectation("or", false);
var peg$e56 = peg$classExpectation([" ", "\t", "\r", "\n"], false, false);
var peg$e57 = peg$literalExpectation("//", false);
var peg$e58 = peg$classExpectation(["\n"], true, false);
var peg$e59 = peg$literalExpectation("/*", false);
var peg$e60 = peg$literalExpectation("*/", false);
var peg$e61 = peg$anyExpectation();
var peg$f0 = function(m) { return m; };
var peg$f1 = function(name, ports, items) { return { type: "module", name, ports: ports || [], items: items.map(i => i[0]) }; };
var peg$f2 = function(head, tail) { return [head, ...tail.map(t => t[3])]; };
var peg$f3 = function() { return []; };
var peg$f4 = function(dir, kind, range, name) { return { type: "ansi", dir, kind: kind || null, range, name }; };
var peg$f5 = function(name) { return { type: "plain", name }; };
var peg$f6 = function() { return "input"; };
var peg$f7 = function() { return "output"; };
var peg$f8 = function() { return "inout"; };
var peg$f9 = function() { return "wire"; };
var peg$f10 = function() { return "reg"; };
var peg$f11 = function(dir, kind, range, names) { return { type: "decl", dir, kind: kind || null, range, names }; };
var peg$f12 = function(kind, range, names) { return { type: "decl", dir: null, kind, range, names: names.map(n => n.name), inits: names }; };
var peg$f13 = function(head, tail) { return [head, ...tail.map(t => t[3])]; };
var peg$f14 = function(head, tail) { return [head, ...tail.map(t => t[3])]; };
var peg$f15 = function(name, e) { return { name, init: e }; };
var peg$f16 = function(name) { return { name, init: null }; };
var peg$f17 = function(msb, lsb) { return { msb, lsb }; };
var peg$f18 = function(lv, e) { return { type: "assign", lv, expr: e, loc: location() }; };
var peg$f19 = function(head, tail, body) { return { type: "always", sens: [head, ...tail.map(t => t[3])], body, loc: location() }; };
var peg$f20 = function() { return "posedge"; };
var peg$f21 = function() { return "negedge"; };
var peg$f22 = function(edge, sig) { return { edge, sig }; };
var peg$f23 = function(lv, e) { return { type: "nba", lv, expr: e, loc: location() }; };
var peg$f24 = function(lv, e) { return { type: "ba", lv, expr: e, loc: location() }; };
var peg$f25 = function(stmts) { return { type: "block", stmts: stmts.map(s => s[0]) }; };
var peg$f26 = function(c, t, f) { return { type: "if", cond: c, then: t, else: f ? f[3] : null }; };
var peg$f27 = function(name, sel) { return { name, sel }; };
var peg$f28 = function(msb, lsb) { return { type: "part", msb, lsb }; };
var peg$f29 = function(idx) { return { type: "bit", idx }; };
var peg$f30 = function(c, t, f) { return { type: "cond", c, t, f }; };
var peg$f31 = function(head, tail) { return binfold(head, tail); };
var peg$f32 = function(head, tail) { return binfold(head, tail); };
var peg$f33 = function(head, tail) { return binfold(head, tail); };
var peg$f34 = function(head, tail) { return binfold(head, tail); };
var peg$f35 = function(head, tail) { return binfold(head, tail); };
var peg$f36 = function(head, tail) { return binfold(head, tail); };
var peg$f37 = function(head, tail) { return binfold(head, tail); };
var peg$f38 = function(head, tail) { return binfold(head, tail); };
var peg$f39 = function(head, tail) { return binfold(head, tail); };
var peg$f40 = function(head, tail) { return binfold(head, tail); };
var peg$f41 = function(op, e) { return { type: "un", op, e }; };
var peg$f42 = function(e) { return e; };
var peg$f43 = function(name, sel) { return sel ? { type: "sel", name, sel } : { type: "id", name }; };
var peg$f44 = function(head, tail) { return { type: "concat", parts: [head, ...tail.map(t => t[3])] }; };
var peg$f45 = function(width, base, digits) {
const radix = { b: 2, h: 16, d: 10, o: 8 }[base.toLowerCase()];
const clean = digits.replace(/[_?]/g, "").replace(/[xXzZ]/g, "0");
return { type: "num", width: parseInt(width, 10), value: parseInt(clean, radix) >>> 0 };
};
var peg$f46 = function(base, digits) {
const radix = { b: 2, h: 16, d: 10, o: 8 }[base.toLowerCase()];
return { type: "num", width: 32, value: parseInt(digits.replace(/_/g, ""), radix) >>> 0 };
};
var peg$f47 = function(digits) { return { type: "num", width: 32, value: parseInt(digits.replace(/_/g, ""), 10) >>> 0 }; };
var peg$f48 = function(name) { return name; };
var peg$currPos = 0;
var peg$savedPos = 0;
var peg$posDetailsCache = [{ line: 1, column: 1 }];
var peg$maxFailPos = 0;
var peg$maxFailExpected = [];
var peg$silentFails = 0;
var peg$result;
if ("startRule" in options) {
if (!(options.startRule in peg$startRuleFunctions)) {
throw new Error("Can't start parsing from rule \"" + options.startRule + "\".");
}
peg$startRuleFunction = peg$startRuleFunctions[options.startRule];
}
function text() {
return input.substring(peg$savedPos, peg$currPos);
}
function offset() {
return peg$savedPos;
}
function range() {
return {
source: peg$source,
start: peg$savedPos,
end: peg$currPos
};
}
function location() {
return peg$computeLocation(peg$savedPos, peg$currPos);
}
function expected(description, location) {
location = location !== undefined
? location
: peg$computeLocation(peg$savedPos, peg$currPos);
throw peg$buildStructuredError(
[peg$otherExpectation(description)],
input.substring(peg$savedPos, peg$currPos),
location
);
}
function error(message, location) {
location = location !== undefined
? location
: peg$computeLocation(peg$savedPos, peg$currPos);
throw peg$buildSimpleError(message, location);
}
function peg$literalExpectation(text, ignoreCase) {
return { type: "literal", text: text, ignoreCase: ignoreCase };
}
function peg$classExpectation(parts, inverted, ignoreCase) {
return { type: "class", parts: parts, inverted: inverted, ignoreCase: ignoreCase };
}
function peg$anyExpectation() {
return { type: "any" };
}
function peg$endExpectation() {
return { type: "end" };
}
function peg$otherExpectation(description) {
return { type: "other", description: description };
}
function peg$computePosDetails(pos) {
var details = peg$posDetailsCache[pos];
var p;
if (details) {
return details;
} else {
p = pos - 1;
while (!peg$posDetailsCache[p]) {
p--;
}
details = peg$posDetailsCache[p];
details = {
line: details.line,
column: details.column
};
while (p < pos) {
if (input.charCodeAt(p) === 10) {
details.line++;
details.column = 1;
} else {
details.column++;
}
p++;
}
peg$posDetailsCache[pos] = details;
return details;
}
}
function peg$computeLocation(startPos, endPos, offset) {
var startPosDetails = peg$computePosDetails(startPos);
var endPosDetails = peg$computePosDetails(endPos);
var res = {
source: peg$source,
start: {
offset: startPos,
line: startPosDetails.line,
column: startPosDetails.column
},
end: {
offset: endPos,
line: endPosDetails.line,
column: endPosDetails.column
}
};
if (offset && peg$source && (typeof peg$source.offset === "function")) {
res.start = peg$source.offset(res.start);
res.end = peg$source.offset(res.end);
}
return res;
}
function peg$fail(expected) {
if (peg$currPos < peg$maxFailPos) { return; }
if (peg$currPos > peg$maxFailPos) {
peg$maxFailPos = peg$currPos;
peg$maxFailExpected = [];
}
peg$maxFailExpected.push(expected);
}
function peg$buildSimpleError(message, location) {
return new peg$SyntaxError(message, null, null, location);
}
function peg$buildStructuredError(expected, found, location) {
return new peg$SyntaxError(
peg$SyntaxError.buildMessage(expected, found),
expected,
found,
location
);
}
function peg$parseStart() {
var s0, s1, s2, s3;
s0 = peg$currPos;
s1 = peg$parse_();
s2 = peg$parseModule();
if (s2 !== peg$FAILED) {
s3 = peg$parse_();
peg$savedPos = s0;
s0 = peg$f0(s2);
} else {
peg$currPos = s0;
s0 = peg$FAILED;
}
return s0;
}
function peg$parseModule() {
var s0, s1, s2, s3, s4, s5, s6, s7, s8, s9, s10, s11, s12;
s0 = peg$currPos;
s1 = peg$parseMODULE();
if (s1 !== peg$FAILED) {
s2 = peg$parse__();
if (s2 !== peg$FAILED) {
s3 = peg$parseIdent();
if (s3 !== peg$FAILED) {
s4 = peg$parse_();
s5 = peg$parsePortList();
if (s5 === peg$FAILED) {
s5 = null;
}
s6 = peg$parse_();
if (input.charCodeAt(peg$currPos) === 59) {
s7 = peg$c0;
peg$currPos++;
} else {
s7 = peg$FAILED;
if (peg$silentFails === 0) { peg$fail(peg$e0); }
}
if (s7 !== peg$FAILED) {
s8 = peg$parse_();
s9 = [];
s10 = peg$currPos;
s11 = peg$parseItem();
if (s11 !== peg$FAILED) {
s12 = peg$parse_();
s11 = [s11, s12];
s10 = s11;
} else {
peg$currPos = s10;
s10 = peg$FAILED;
}
while (s10 !== peg$FAILED) {
s9.push(s10);
s10 = peg$currPos;
s11 = peg$parseItem();
if (s11 !== peg$FAILED) {
s12 = peg$parse_();
s11 = [s11, s12];
s10 = s11;
} else {
peg$currPos = s10;
s10 = peg$FAILED;
}
}
s10 = peg$parseENDMODULE();
if (s10 !== peg$FAILED) {
peg$savedPos = s0;
s0 = peg$f1(s3, s5, s9);
} else {
peg$currPos = s0;
s0 = peg$FAILED;
}
} else {
peg$currPos = s0;
s0 = peg$FAILED;
}
} else {
peg$currPos = s0;
s0 = peg$FAILED;
}
} else {
peg$currPos = s0;
s0 = peg$FAILED;
}
} else {
peg$currPos = s0;
s0 = peg$FAILED;
}
return s0;
}
function peg$parsePortList() {
var s0, s1, s2, s3, s4, s5, s6, s7, s8, s9;
s0 = peg$currPos;
if (input.charCodeAt(peg$currPos) === 40) {
s1 = peg$c1;
peg$currPos++;
} else {
s1 = peg$FAILED;
if (peg$silentFails === 0) { peg$fail(peg$e1); }
}
if (s1 !== peg$FAILED) {
s2 = peg$parse_();
s3 = peg$parsePortItem();
if (s3 !== peg$FAILED) {
s4 = [];
s5 = peg$currPos;
s6 = peg$parse_();
if (input.charCodeAt(peg$currPos) === 44) {
s7 = peg$c2;
peg$currPos++;
} else {
s7 = peg$FAILED;
if (peg$silentFails === 0) { peg$fail(peg$e2); }
}
if (s7 !== peg$FAILED) {
s8 = peg$parse_();
s9 = peg$parsePortItem();
if (s9 !== peg$FAILED) {
s6 = [s6, s7, s8, s9];
s5 = s6;
} else {
peg$currPos = s5;
s5 = peg$FAILED;
}
} else {
peg$currPos = s5;
s5 = peg$FAILED;
}
while (s5 !== peg$FAILED) {
s4.push(s5);
s5 = peg$currPos;
s6 = peg$parse_();
if (input.charCodeAt(peg$currPos) === 44) {
s7 = peg$c2;
peg$currPos++;
} else {
s7 = peg$FAILED;
if (peg$silentFails === 0) { peg$fail(peg$e2); }
}
if (s7 !== peg$FAILED) {
s8 = peg$parse_();
s9 = peg$parsePortItem();
if (s9 !== peg$FAILED) {
s6 = [s6, s7, s8, s9];
s5 = s6;
} else {
peg$currPos = s5;
s5 = peg$FAILED;
}
} else {
peg$currPos = s5;
s5 = peg$FAILED;
}
}
s5 = peg$parse_();
if (input.charCodeAt(peg$currPos) === 41) {
s6 = peg$c3;
peg$currPos++;
} else {
s6 = peg$FAILED;
if (peg$silentFails === 0) { peg$fail(peg$e3); }
}
if (s6 !== peg$FAILED) {
peg$savedPos = s0;
s0 = peg$f2(s3, s4);
} else {
peg$currPos = s0;
s0 = peg$FAILED;
}
} else {
peg$currPos = s0;
s0 = peg$FAILED;
}
} else {
peg$currPos = s0;
s0 = peg$FAILED;
}
if (s0 === peg$FAILED) {
s0 = peg$currPos;
if (input.charCodeAt(peg$currPos) === 40) {
s1 = peg$c1;
peg$currPos++;
} else {
s1 = peg$FAILED;
if (peg$silentFails === 0) { peg$fail(peg$e1); }
}
if (s1 !== peg$FAILED) {
s2 = peg$parse_();
if (input.charCodeAt(peg$currPos) === 41) {
s3 = peg$c3;
peg$currPos++;
} else {
s3 = peg$FAILED;
if (peg$silentFails === 0) { peg$fail(peg$e3); }
}
if (s3 !== peg$FAILED) {
peg$savedPos = s0;
s0 = peg$f3();
} else {
peg$currPos = s0;
s0 = peg$FAILED;
}
} else {
peg$currPos = s0;
s0 = peg$FAILED;
}
}
return s0;
}
function peg$parsePortItem() {
var s0, s1, s2, s3, s4, s5, s6, s7;
s0 = peg$currPos;
s1 = peg$parseDirection();
if (s1 !== peg$FAILED) {
s2 = peg$parse__();
if (s2 !== peg$FAILED) {
s3 = peg$parseNetKind();
if (s3 === peg$FAILED) {
s3 = null;
}
s4 = peg$parse_();
s5 = peg$parseRange();
if (s5 === peg$FAILED) {
s5 = null;
}
s6 = peg$parse_();
s7 = peg$parseIdent();
if (s7 !== peg$FAILED) {
peg$savedPos = s0;
s0 = peg$f4(s1, s3, s5, s7);
} else {
peg$currPos = s0;
s0 = peg$FAILED;
}
} else {
peg$currPos = s0;
s0 = peg$FAILED;
}
} else {
peg$currPos = s0;
s0 = peg$FAILED;
}
if (s0 === peg$FAILED) {
s0 = peg$currPos;
s1 = peg$parseIdent();
if (s1 !== peg$FAILED) {
peg$savedPos = s0;
s1 = peg$f5(s1);
}
s0 = s1;
}
return s0;
}
function peg$parseDirection() {
var s0, s1;
s0 = peg$currPos;
s1 = peg$parseINPUT();
if (s1 !== peg$FAILED) {
peg$savedPos = s0;
s1 = peg$f6();
}
s0 = s1;
if (s0 === peg$FAILED) {
s0 = peg$currPos;
s1 = peg$parseOUTPUT();
if (s1 !== peg$FAILED) {
peg$savedPos = s0;
s1 = peg$f7();
}
s0 = s1;
if (s0 === peg$FAILED) {
s0 = peg$currPos;
s1 = peg$parseINOUT();
if (s1 !== peg$FAILED) {
peg$savedPos = s0;
s1 = peg$f8();
}
s0 = s1;
}
}
return s0;
}
function peg$parseNetKind() {
var s0, s1;
s0 = peg$currPos;
s1 = peg$parseWIRE();
if (s1 !== peg$FAILED) {
peg$savedPos = s0;
s1 = peg$f9();
}
s0 = s1;
if (s0 === peg$FAILED) {
s0 = peg$currPos;
s1 = peg$parseREG();
if (s1 !== peg$FAILED) {
peg$savedPos = s0;
s1 = peg$f10();
}
s0 = s1;
}
return s0;
}
function peg$parseItem() {
var s0;