From 3c6d0913c0b16f346017685065950ab3cd75d3dd Mon Sep 17 00:00:00 2001
From: Chris Wanstrath <chris@ozmm.org>
Date: Fri, 7 Nov 2025 22:42:26 -0800
Subject: [PATCH] bitwise operators

---
 src/compiler/compiler.ts           |  18 +++
 src/compiler/tests/bitwise.test.ts | 178 +++++++++++++++++++++++++++++
 src/parser/operatorTokenizer.ts    |   6 +
 src/parser/shrimp.grammar          |  11 +-
 src/parser/shrimp.terms.ts         |  96 ++++++++--------
 src/parser/shrimp.ts               |  26 ++---
 src/parser/tests/bitwise.test.ts   |  72 ++++++++++++
 src/prelude/index.ts               |   1 +
 8 files changed, 348 insertions(+), 60 deletions(-)
 create mode 100644 src/compiler/tests/bitwise.test.ts
 create mode 100644 src/parser/tests/bitwise.test.ts

diff --git a/src/compiler/compiler.ts b/src/compiler/compiler.ts
index 9ce7bce..2d693e1 100644
--- a/src/compiler/compiler.ts
+++ b/src/compiler/compiler.ts
@@ -232,6 +232,24 @@ export class Compiler {
           case '%':
             instructions.push(['MOD'])
             break
+          case 'band':
+            instructions.push(['BIT_AND'])
+            break
+          case 'bor':
+            instructions.push(['BIT_OR'])
+            break
+          case 'bxor':
+            instructions.push(['BIT_XOR'])
+            break
+          case '<<':
+            instructions.push(['BIT_SHL'])
+            break
+          case '>>':
+            instructions.push(['BIT_SHR'])
+            break
+          case '>>>':
+            instructions.push(['BIT_USHR'])
+            break
           default:
             throw new CompilerError(`Unsupported binary operator: ${opValue}`, op.from, op.to)
         }
diff --git a/src/compiler/tests/bitwise.test.ts b/src/compiler/tests/bitwise.test.ts
new file mode 100644
index 0000000..0d39a52
--- /dev/null
+++ b/src/compiler/tests/bitwise.test.ts
@@ -0,0 +1,178 @@
+import { expect, describe, test } from 'bun:test'
+
+describe('bitwise operators', () => {
+  describe('band (bitwise AND)', () => {
+    test('basic AND operation', () => {
+      expect('5 band 3').toEvaluateTo(1)
+      // 5 = 0101, 3 = 0011, result = 0001 = 1
+    })
+
+    test('AND with zero', () => {
+      expect('5 band 0').toEvaluateTo(0)
+    })
+
+    test('AND with all bits set', () => {
+      expect('15 band 7').toEvaluateTo(7)
+      // 15 = 1111, 7 = 0111, result = 0111 = 7
+    })
+
+    test('AND in assignment', () => {
+      expect('x = 12 band 10').toEvaluateTo(8)
+      // 12 = 1100, 10 = 1010, result = 1000 = 8
+    })
+  })
+
+  describe('bor (bitwise OR)', () => {
+    test('basic OR operation', () => {
+      expect('5 bor 3').toEvaluateTo(7)
+      // 5 = 0101, 3 = 0011, result = 0111 = 7
+    })
+
+    test('OR with zero', () => {
+      expect('5 bor 0').toEvaluateTo(5)
+    })
+
+    test('OR with all bits set', () => {
+      expect('8 bor 4').toEvaluateTo(12)
+      // 8 = 1000, 4 = 0100, result = 1100 = 12
+    })
+  })
+
+  describe('bxor (bitwise XOR)', () => {
+    test('basic XOR operation', () => {
+      expect('5 bxor 3').toEvaluateTo(6)
+      // 5 = 0101, 3 = 0011, result = 0110 = 6
+    })
+
+    test('XOR with itself returns zero', () => {
+      expect('5 bxor 5').toEvaluateTo(0)
+    })
+
+    test('XOR with zero returns same value', () => {
+      expect('7 bxor 0').toEvaluateTo(7)
+    })
+
+    test('XOR in assignment', () => {
+      expect('result = 8 bxor 12').toEvaluateTo(4)
+      // 8 = 1000, 12 = 1100, result = 0100 = 4
+    })
+  })
+
+  describe('bnot (bitwise NOT)', () => {
+    test('NOT of positive number', () => {
+      expect('bnot 5').toEvaluateTo(-6)
+      // ~5 = -6 (two\'s complement)
+    })
+
+    test('NOT of zero', () => {
+      expect('bnot 0').toEvaluateTo(-1)
+    })
+
+    test('NOT of negative number', () => {
+      expect('bnot -1').toEvaluateTo(0)
+    })
+
+    test('double NOT returns original', () => {
+      expect('bnot (bnot 5)').toEvaluateTo(5)
+    })
+  })
+
+  describe('<< (left shift)', () => {
+    test('basic left shift', () => {
+      expect('5 << 2').toEvaluateTo(20)
+      // 5 << 2 = 20
+    })
+
+    test('shift by zero', () => {
+      expect('5 << 0').toEvaluateTo(5)
+    })
+
+    test('shift by one', () => {
+      expect('3 << 1').toEvaluateTo(6)
+    })
+
+    test('large shift', () => {
+      expect('1 << 10').toEvaluateTo(1024)
+    })
+  })
+
+  describe('>> (signed right shift)', () => {
+    test('basic right shift', () => {
+      expect('20 >> 2').toEvaluateTo(5)
+      // 20 >> 2 = 5
+    })
+
+    test('shift by zero', () => {
+      expect('20 >> 0').toEvaluateTo(20)
+    })
+
+    test('preserves sign for negative numbers', () => {
+      expect('-20 >> 2').toEvaluateTo(-5)
+      // Sign is preserved
+    })
+
+    test('negative number right shift', () => {
+      expect('-8 >> 1').toEvaluateTo(-4)
+    })
+  })
+
+  describe('>>> (unsigned right shift)', () => {
+    test('basic unsigned right shift', () => {
+      expect('20 >>> 2').toEvaluateTo(5)
+    })
+
+    test('unsigned shift of -1', () => {
+      expect('-1 >>> 1').toEvaluateTo(2147483647)
+      // -1 >>> 1 = 2147483647 (unsigned, no sign extension)
+    })
+
+    test('unsigned shift of negative number', () => {
+      expect('-8 >>> 1').toEvaluateTo(2147483644)
+    })
+  })
+
+  describe('compound expressions', () => {
+    test('multiple bitwise operations', () => {
+      expect('(5 band 3) bor (8 bxor 12)').toEvaluateTo(5)
+      // (5 & 3) | (8 ^ 12) = 1 | 4 = 5
+    })
+
+    test('bitwise with variables', () => {
+      expect(`
+        a = 5
+        b = 3
+        a bor b
+      `).toEvaluateTo(7)
+    })
+
+    test('shift operations with variables', () => {
+      expect(`
+        x = 16
+        y = 2
+        x >> y
+      `).toEvaluateTo(4)
+    })
+
+    test('mixing shifts and bitwise', () => {
+      expect('(8 << 1) band 15').toEvaluateTo(0)
+      // (8 << 1) & 15 = 16 & 15 = 0
+    })
+
+    test('mixing shifts and bitwise 2', () => {
+      expect('(7 << 1) band 15').toEvaluateTo(14)
+      // (7 << 1) & 15 = 14 & 15 = 14
+    })
+  })
+
+  describe('precedence', () => {
+    test('bitwise has correct precedence with arithmetic', () => {
+      expect('1 + 2 band 3').toEvaluateTo(3)
+      // (1 + 2) & 3 = 3 & 3 = 3
+    })
+
+    test('shift has correct precedence', () => {
+      expect('4 + 8 << 1').toEvaluateTo(24)
+      // (4 + 8) << 1 = 12 << 1 = 24
+    })
+  })
+})
diff --git a/src/parser/operatorTokenizer.ts b/src/parser/operatorTokenizer.ts
index 3c85400..c909543 100644
--- a/src/parser/operatorTokenizer.ts
+++ b/src/parser/operatorTokenizer.ts
@@ -5,6 +5,12 @@ type Operator = { str: string; tokenName: keyof typeof terms }
 const operators: Array<Operator> = [
   { str: 'and', tokenName: 'And' },
   { str: 'or', tokenName: 'Or' },
+  { str: 'band', tokenName: 'Band' },
+  { str: 'bor', tokenName: 'Bor' },
+  { str: 'bxor', tokenName: 'Bxor' },
+  { str: '>>>', tokenName: 'Ushr' },  // Must come before >>
+  { str: '>>', tokenName: 'Shr' },
+  { str: '<<', tokenName: 'Shl' },
   { str: '>=', tokenName: 'Gte' },
   { str: '<=', tokenName: 'Lte' },
   { str: '!=', tokenName: 'Neq' },
diff --git a/src/parser/shrimp.grammar b/src/parser/shrimp.grammar
index 97908d9..a4e22b0 100644
--- a/src/parser/shrimp.grammar
+++ b/src/parser/shrimp.grammar
@@ -6,7 +6,7 @@
 
 @top Program { item* }
 
-@external tokens operatorTokenizer from "./operatorTokenizer" { Star, Slash, Plus, Minus, And, Or, Eq, EqEq, Neq, Lt, Lte, Gt, Gte, Modulo, PlusEq, MinusEq, StarEq, SlashEq, ModuloEq }
+@external tokens operatorTokenizer from "./operatorTokenizer" { Star, Slash, Plus, Minus, And, Or, Eq, EqEq, Neq, Lt, Lte, Gt, Gte, Modulo, PlusEq, MinusEq, StarEq, SlashEq, ModuloEq, Band, Bor, Bxor, Shl, Shr, Ushr }
 
 @tokens {
   @precedence { Number Regex }
@@ -45,6 +45,7 @@ null { @specialize[@name=Null]<Identifier, "null"> }
   or @left,
   and @left,
   comparison @left,
+  bitwise @left,
   multiplicative @left,
   additive @left,
   call
@@ -184,7 +185,13 @@ BinOp {
   (expression | BinOp) !multiplicative Star (expression | BinOp) |
   (expression | BinOp) !multiplicative Slash (expression | BinOp) |
   (expression | BinOp) !additive Plus (expression | BinOp) |
-  (expression | BinOp) !additive Minus (expression | BinOp)
+  (expression | BinOp) !additive Minus (expression | BinOp) |
+  (expression | BinOp) !bitwise Band (expression | BinOp) |
+  (expression | BinOp) !bitwise Bor (expression | BinOp) |
+  (expression | BinOp) !bitwise Bxor (expression | BinOp) |
+  (expression | BinOp) !bitwise Shl (expression | BinOp) |
+  (expression | BinOp) !bitwise Shr (expression | BinOp) |
+  (expression | BinOp) !bitwise Ushr (expression | BinOp)
 }
 
 ParenExpr {
diff --git a/src/parser/shrimp.terms.ts b/src/parser/shrimp.terms.ts
index 04cb710..9c80715 100644
--- a/src/parser/shrimp.terms.ts
+++ b/src/parser/shrimp.terms.ts
@@ -19,48 +19,54 @@ export const
   StarEq = 17,
   SlashEq = 18,
   ModuloEq = 19,
-  Identifier = 20,
-  AssignableIdentifier = 21,
-  Word = 22,
-  IdentifierBeforeDot = 23,
-  Do = 24,
-  Comment = 25,
-  Program = 26,
-  PipeExpr = 27,
-  WhileExpr = 29,
-  keyword = 70,
-  ConditionalOp = 31,
-  ParenExpr = 32,
-  IfExpr = 33,
-  FunctionCall = 35,
-  DotGet = 36,
-  Number = 37,
-  PositionalArg = 38,
-  FunctionDef = 39,
-  Params = 40,
-  NamedParam = 41,
-  NamedArgPrefix = 42,
-  String = 43,
-  StringFragment = 44,
-  Interpolation = 45,
-  EscapeSeq = 46,
-  Boolean = 47,
-  Null = 48,
-  colon = 49,
-  CatchExpr = 50,
-  Block = 52,
-  FinallyExpr = 53,
-  Underscore = 56,
-  NamedArg = 57,
-  ElseIfExpr = 58,
-  ElseExpr = 60,
-  FunctionCallOrIdentifier = 61,
-  BinOp = 62,
-  Regex = 63,
-  Dict = 64,
-  Array = 65,
-  FunctionCallWithBlock = 66,
-  TryExpr = 67,
-  Throw = 69,
-  CompoundAssign = 71,
-  Assign = 72
+  Band = 20,
+  Bor = 21,
+  Bxor = 22,
+  Shl = 23,
+  Shr = 24,
+  Ushr = 25,
+  Identifier = 26,
+  AssignableIdentifier = 27,
+  Word = 28,
+  IdentifierBeforeDot = 29,
+  Do = 30,
+  Comment = 31,
+  Program = 32,
+  PipeExpr = 33,
+  WhileExpr = 35,
+  keyword = 76,
+  ConditionalOp = 37,
+  ParenExpr = 38,
+  IfExpr = 39,
+  FunctionCall = 41,
+  DotGet = 42,
+  Number = 43,
+  PositionalArg = 44,
+  FunctionDef = 45,
+  Params = 46,
+  NamedParam = 47,
+  NamedArgPrefix = 48,
+  String = 49,
+  StringFragment = 50,
+  Interpolation = 51,
+  EscapeSeq = 52,
+  Boolean = 53,
+  Null = 54,
+  colon = 55,
+  CatchExpr = 56,
+  Block = 58,
+  FinallyExpr = 59,
+  Underscore = 62,
+  NamedArg = 63,
+  ElseIfExpr = 64,
+  ElseExpr = 66,
+  FunctionCallOrIdentifier = 67,
+  BinOp = 68,
+  Regex = 69,
+  Dict = 70,
+  Array = 71,
+  FunctionCallWithBlock = 72,
+  TryExpr = 73,
+  Throw = 75,
+  CompoundAssign = 77,
+  Assign = 78
diff --git a/src/parser/shrimp.ts b/src/parser/shrimp.ts
index fa41719..8a7b29c 100644
--- a/src/parser/shrimp.ts
+++ b/src/parser/shrimp.ts
@@ -4,24 +4,24 @@ import {operatorTokenizer} from "./operatorTokenizer"
 import {tokenizer, specializeKeyword} from "./tokenizer"
 import {trackScope} from "./parserScopeContext"
 import {highlighting} from "./highlight"
-const spec_Identifier = {__proto__:null,while:60, if:68, null:96, catch:102, finally:108, end:110, else:118, try:136, throw:140}
+const spec_Identifier = {__proto__:null,while:72, if:80, null:108, catch:114, finally:120, end:122, else:130, try:148, throw:152}
 export const parser = LRParser.deserialize({
   version: 14,
-  states: "9UQYQbOOO!dOpO'#DQO!iOSO'#DXO$_QcO'#DkO&rQcO'#EYOOQ`'#Eh'#EhO'uQRO'#DlO)[QcO'#EWO)lQbO'#C|OOQa'#Dn'#DnO+nQbO'#DoOOQa'#EY'#EYO+uQcO'#EYO+|QcO'#EXO,yQcO'#EWO-TQRO'#DuOOQ`'#EW'#EWO-iQbO'#EWO-pQQO'#EVOOQ`'#EV'#EVOOQ`'#Dw'#DwQYQbOOO-{QbO'#DTO.WQbO'#C}O.{QbO'#CyO/pQQO'#DqO.{QbO'#DsO/uObO,59lO0QQbO'#DZO0YQWO'#D[OOOO'#E`'#E`OOOO'#D|'#D|O0nOSO,59sOOQa,59s,59sOOQ`'#DS'#DSO0|QbO'#DgOOQ`'#E^'#E^OOQ`'#Dy'#DyO1WQbO,59kOOQa'#EX'#EXO.{QbO,5:WO.{QbO,5:WO.{QbO,5:WO.{QbO,59gO.{QbO,59gO.{QbO,59gO2QQRO,59hO2^QQO,59hO2fQQO,59hO2qQRO,59hO3[QRO,59hO3jQQO'#CwOOQ`'#EP'#EPO3oQbO,5:ZO3vQQO,5:YOOQa,5:Z,5:ZO4RQbO,5:ZO)lQbO,5:bO)lQbO,5:aO4]QbO,5:[O4dQbO,59cOOQ`,5:q,5:qO)lQbO'#DxOOQ`-E7u-E7uOOQ`'#Dz'#DzO5OQbO'#DUO5ZQbO'#DVOOQO'#D{'#D{O5RQQO'#DUO5iQQO,59oO5nQcO'#EXO5uQRO'#E[O6lQRO'#E[OOQO'#E['#E[O6sQQO,59iO6xQRO,59eO7PQRO,59eO4]QbO,5:]O7[QcO,5:_O8dQcO,5:_O8tQcO,5:_OOQa1G/W1G/WOOOO,59u,59uOOOO,59v,59vOOOO-E7z-E7zOOQa1G/_1G/_OOQ`,5:R,5:ROOQ`-E7w-E7wOOQa1G/r1G/rO9sQcO1G/rO9}QcO1G/rO:XQcO1G/rOOQa1G/R1G/RO<TQcO1G/RO<[QcO1G/RO<cQcO1G/ROOQa1G/S1G/SOOQ`-E7}-E7}O<jQQO1G/tOOQa1G/u1G/uO<uQbO1G/uOOQO'#EQ'#EQO<jQQO1G/tOOQa1G/t1G/tOOQ`'#ER'#ERO<uQbO1G/uO=PQbO1G/|O=kQbO1G/{O>VQbO'#DbO>hQbO'#DbO>{QbO1G/vOOQ`-E7v-E7vOOQ`,5:d,5:dOOQ`-E7x-E7xO?WQQO,59pOOQO,59q,59qOOQO-E7y-E7yO?`QbO1G/ZO4]QbO1G/TO4]QbO1G/PO?gQbO1G/wO?rQQO7+%`OOQa7+%`7+%`O?}QbO7+%aOOQa7+%a7+%aOOQO-E8O-E8OOOQ`-E8P-E8POOQ`'#D}'#D}O@XQQO'#D}O@aQbO'#EgOOQ`,59|,59|O@tQbO'#D`O@yQQO'#DcOOQ`7+%b7+%bOAOQbO7+%bOATQbO7+%bOA]QbO7+$uOAkQbO7+$uOA{QbO7+$oOBTQbO7+$kOOQ`7+%c7+%cOBYQbO7+%cOB_QbO7+%cOOQa<<Hz<<HzOOQa<<H{<<H{OOQ`,5:i,5:iOOQ`-E7{-E7{OBgQQO,59zO4]QbO,59}OOQ`<<H|<<H|OBlQbO<<H|OOQ`<<Ha<<HaOBqQbO<<HaOBvQbO<<HaOCOQbO<<HaOOQ`'#EO'#EOOCZQbO<<HZOCcQbO'#DjOOQ`<<HZ<<HZOCkQbO<<HZOOQ`<<HV<<HVOOQ`<<H}<<H}OCpQbO<<H}O4]QbO1G/fOOQ`1G/i1G/iOOQ`AN>hAN>hOOQ`AN={AN={OCuQbOAN={OCzQbOAN={OOQ`-E7|-E7|OOQ`AN=uAN=uODSQbOAN=uO.WQbO,5:SO4]QbO,5:UOOQ`AN>iAN>iOOQ`7+%Q7+%QOOQ`G23gG23gODXQbOG23gPD^QbO'#DhOOQ`G23aG23aODcQQO1G/nOOQ`1G/p1G/pOOQ`LD)RLD)RO4]QbO7+%YOOQ`<<Ht<<Ht",
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-  tokenPrec: 1634
+  tokenData: "C|~R|OX#{XY$jYZ%TZp#{pq$jqs#{st%ntu'tuw#{wx'yxy(Oyz(iz{#{{|)S|}#{}!O+v!O!P#{!P!Q.]!Q![)q![!]6x!]!^%T!^!}#{!}#O7c#O#P9X#P#Q9^#Q#R#{#R#S9w#S#T#{#T#Y,w#Y#Z:b#Z#b,w#b#c?`#c#f,w#f#g@]#g#h,w#h#iAY#i#o,w#o#p#{#p#qC^#q;'S#{;'S;=`$d<%l~#{~O#{~~CwS$QU!SSOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{S$gP;=`<%l#{^$qU!SS#OYOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{U%[U!SS#`QOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{^%sW!SSOp#{pq&]qt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{^&dZoY!SSOY&]YZ#{Zt&]tu'Vuw&]wx'Vx#O&]#O#P'V#P;'S&];'S;=`'n<%lO&]Y'[SoYOY'VZ;'S'V;'S;=`'h<%lO'VY'kP;=`<%l'V^'qP;=`<%l&]~'yO#Z~~(OO#X~U(VU!SS#TQOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{U(pU!SS#cQOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{U)XW!SSOt#{uw#{x!Q#{!Q![)q![#O#{#P;'S#{;'S;=`$d<%lO#{U)xY!SS{QOt#{uw#{x!O#{!O!P*h!P!Q#{!Q![)q![#O#{#P;'S#{;'S;=`$d<%lO#{U*mW!SSOt#{uw#{x!Q#{!Q![+V![#O#{#P;'S#{;'S;=`$d<%lO#{U+^W!SS{QOt#{uw#{x!Q#{!Q![+V![#O#{#P;'S#{;'S;=`$d<%lO#{U+{^!SSOt#{uw#{x}#{}!O,w!O!Q#{!Q![)q![!_#{!_!`-r!`#O#{#P#T#{#T#o,w#o;'S#{;'S;=`$d<%lO#{U,|[!SSOt#{uw#{x}#{}!O,w!O!_#{!_!`-r!`#O#{#P#T#{#T#o,w#o;'S#{;'S;=`$d<%lO#{U-yU!QQ!SSOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{U.bW!SSOt#{uw#{x!P#{!P!Q.z!Q#O#{#P;'S#{;'S;=`$d<%lO#{U/P^!SSOY/{YZ#{Zt/{tu1Ouw/{wx1Ox!P/{!P!Q#{!Q!}/{!}#O5q#O#P3^#P;'S/{;'S;=`6r<%lO/{U0S^!SS!gQOY/{YZ#{Zt/{tu1Ouw/{wx1Ox!P/{!P!Q3s!Q!}/{!}#O5q#O#P3^#P;'S/{;'S;=`6r<%lO/{Q1TX!gQOY1OZ!P1O!P!Q1p!Q!}1O!}#O2_#O#P3^#P;'S1O;'S;=`3m<%lO1OQ1sP!P!Q1vQ1{U!gQ#Z#[1v#]#^1v#a#b1v#g#h1v#i#j1v#m#n1vQ2bVOY2_Z#O2_#O#P2w#P#Q1O#Q;'S2_;'S;=`3W<%lO2_Q2zSOY2_Z;'S2_;'S;=`3W<%lO2_Q3ZP;=`<%l2_Q3aSOY1OZ;'S1O;'S;=`3m<%lO1OQ3pP;=`<%l1OU3xW!SSOt#{uw#{x!P#{!P!Q4b!Q#O#{#P;'S#{;'S;=`$d<%lO#{U4ib!SS!gQOt#{uw#{x#O#{#P#Z#{#Z#[4b#[#]#{#]#^4b#^#a#{#a#b4b#b#g#{#g#h4b#h#i#{#i#j4b#j#m#{#m#n4b#n;'S#{;'S;=`$d<%lO#{U5v[!SSOY5qYZ#{Zt5qtu2_uw5qwx2_x#O5q#O#P2w#P#Q/{#Q;'S5q;'S;=`6l<%lO5qU6oP;=`<%l5qU6uP;=`<%l/{U7PU!SS!XQOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{U7jW#eQ!SSOt#{uw#{x!_#{!_!`8S!`#O#{#P;'S#{;'S;=`$d<%lO#{U8XV!SSOt#{uw#{x#O#{#P#Q8n#Q;'S#{;'S;=`$d<%lO#{U8uU#dQ!SSOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{~9^O#[~U9eU#fQ!SSOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{U:OU!SS!`QOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{U:g]!SSOt#{uw#{x}#{}!O,w!O!_#{!_!`-r!`#O#{#P#T#{#T#U;`#U#o,w#o;'S#{;'S;=`$d<%lO#{U;e^!SSOt#{uw#{x}#{}!O,w!O!_#{!_!`-r!`#O#{#P#T#{#T#`,w#`#a<a#a#o,w#o;'S#{;'S;=`$d<%lO#{U<f^!SSOt#{uw#{x}#{}!O,w!O!_#{!_!`-r!`#O#{#P#T#{#T#g,w#g#h=b#h#o,w#o;'S#{;'S;=`$d<%lO#{U=g^!SSOt#{uw#{x}#{}!O,w!O!_#{!_!`-r!`#O#{#P#T#{#T#X,w#X#Y>c#Y#o,w#o;'S#{;'S;=`$d<%lO#{U>j[!VQ!SSOt#{uw#{x}#{}!O,w!O!_#{!_!`-r!`#O#{#P#T#{#T#o,w#o;'S#{;'S;=`$d<%lO#{^?g[#]W!SSOt#{uw#{x}#{}!O,w!O!_#{!_!`-r!`#O#{#P#T#{#T#o,w#o;'S#{;'S;=`$d<%lO#{^@d[#_W!SSOt#{uw#{x}#{}!O,w!O!_#{!_!`-r!`#O#{#P#T#{#T#o,w#o;'S#{;'S;=`$d<%lO#{^Aa^#^W!SSOt#{uw#{x}#{}!O,w!O!_#{!_!`-r!`#O#{#P#T#{#T#f,w#f#gB]#g#o,w#o;'S#{;'S;=`$d<%lO#{UBb^!SSOt#{uw#{x}#{}!O,w!O!_#{!_!`-r!`#O#{#P#T#{#T#i,w#i#j=b#j#o,w#o;'S#{;'S;=`$d<%lO#{UCeUrQ!SSOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{~C|O#g~",
+  tokenizers: [operatorTokenizer, 1, 2, 3, tokenizer, new LocalTokenGroup("[~RP!O!PU~ZO#V~~", 11)],
+  topRules: {"Program":[0,32]},
+  specialized: [{term: 26, get: (value: any, stack: any) => (specializeKeyword(value, stack) << 1), external: specializeKeyword},{term: 26, get: (value: keyof typeof spec_Identifier) => spec_Identifier[value] || -1}],
+  tokenPrec: 1863
 })
diff --git a/src/parser/tests/bitwise.test.ts b/src/parser/tests/bitwise.test.ts
new file mode 100644
index 0000000..5ccc8ed
--- /dev/null
+++ b/src/parser/tests/bitwise.test.ts
@@ -0,0 +1,72 @@
+import { expect, describe, test } from 'bun:test'
+
+import '../shrimp.grammar' // Importing this so changes cause it to retest!
+
+describe('bitwise operators - grammar', () => {
+  test('parses band (bitwise AND)', () => {
+    expect('5 band 3').toMatchTree(`
+      BinOp
+        Number 5
+        Band band
+        Number 3`)
+  })
+
+  test('parses bor (bitwise OR)', () => {
+    expect('5 bor 3').toMatchTree(`
+      BinOp
+        Number 5
+        Bor bor
+        Number 3`)
+  })
+
+  test('parses bxor (bitwise XOR)', () => {
+    expect('5 bxor 3').toMatchTree(`
+      BinOp
+        Number 5
+        Bxor bxor
+        Number 3`)
+  })
+
+  test('parses << (left shift)', () => {
+    expect('5 << 2').toMatchTree(`
+      BinOp
+        Number 5
+        Shl <<
+        Number 2`)
+  })
+
+  test('parses >> (signed right shift)', () => {
+    expect('20 >> 2').toMatchTree(`
+      BinOp
+        Number 20
+        Shr >>
+        Number 2`)
+  })
+
+  test('parses >>> (unsigned right shift)', () => {
+    expect('-1 >>> 1').toMatchTree(`
+      BinOp
+        Number -1
+        Ushr >>>
+        Number 1`)
+  })
+
+  test('parses bnot (bitwise NOT) as function call', () => {
+    expect('bnot 5').toMatchTree(`
+      FunctionCall
+        Identifier bnot
+        PositionalArg
+          Number 5`)
+  })
+
+  test('bitwise operators work in expressions', () => {
+    expect('x = 5 band 3').toMatchTree(`
+      Assign
+        AssignableIdentifier x
+        Eq =
+        BinOp
+          Number 5
+          Band band
+          Number 3`)
+  })
+})
diff --git a/src/prelude/index.ts b/src/prelude/index.ts
index 488414b..4771cfd 100644
--- a/src/prelude/index.ts
+++ b/src/prelude/index.ts
@@ -56,6 +56,7 @@ export const globals = {
 
   // boolean/logic
   not: (v: any) => !v,
+  bnot: (n: number) => ~(n | 0),
 
   // utilities
   inc: (n: number) => n + 1,