add bang! support (like a oneline try/catch)

bun.lock

@@ -62,7 +62,7 @@
 
     "hono": ["hono@4.9.8", "", {}, "sha512-JW8Bb4RFWD9iOKxg5PbUarBYGM99IcxFl2FPBo2gSJO11jjUDqlP1Bmfyqt8Z/dGhIQ63PMA9LdcLefXyIasyg=="],
 
-    "reefvm": ["reefvm@git+https://git.nose.space/defunkt/reefvm#c69b172c78853756ec8acba5bc33d93eb6a571c6", { "peerDependencies": { "typescript": "^5" } }, "c69b172c78853756ec8acba5bc33d93eb6a571c6"],
+    "reefvm": ["reefvm@git+https://git.nose.space/defunkt/reefvm#4b2fd615546cc4dd1cacd40ce3cf4c014d3eec9f", { "peerDependencies": { "typescript": "^5" } }, "4b2fd615546cc4dd1cacd40ce3cf4c014d3eec9f"],
 
     "style-mod": ["style-mod@4.1.2", "", {}, "sha512-wnD1HyVqpJUI2+eKZ+eo1UwghftP6yuFheBqqe+bWCotBjC2K1YnteJILRMs3SM4V/0dLEW1SC27MWP5y+mwmw=="],
 

src/compiler/compiler.ts

@@ -338,8 +338,20 @@ export class Compiler {
       CALL
       */
       case terms.FunctionCall: {
-        const { identifierNode, namedArgs, positionalArgs } = getFunctionCallParts(node, input)
+        const { identifierNode, namedArgs, positionalArgs, bang } = getFunctionCallParts(node, input)
         const instructions: ProgramItem[] = []
+
+        let catchLabel = ''
+        let endLabel = ''
+
+        if (bang) {
+          // wrap function call in try block
+          this.tryLabelCount++
+          catchLabel = `.catch_${this.tryLabelCount}`
+          endLabel = `.end_try_${this.tryLabelCount}`
+          instructions.push(['PUSH_TRY', catchLabel])
+        }
+
         instructions.push(...this.#compileNode(identifierNode, input))
 
         positionalArgs.forEach((arg) => {
@@ -356,6 +368,20 @@ export class Compiler {
         instructions.push(['PUSH', namedArgs.length])
         instructions.push(['CALL'])
 
+        if (bang) {
+          instructions.push(['PUSH', null])
+          instructions.push(['SWAP'])
+          instructions.push(['MAKE_ARRAY', 2])
+          instructions.push(['POP_TRY'])
+          instructions.push(['JUMP', endLabel])
+
+          instructions.push([`${catchLabel}:`])
+          instructions.push(['PUSH', null])
+          instructions.push(['MAKE_ARRAY', 2])
+
+          instructions.push([`${endLabel}:`])
+        }
+
         return instructions
       }
 

src/compiler/tests/compiler.test.ts

@@ -266,6 +266,73 @@ describe('native functions', () => {
   })
 })
 
+describe('error handling with ! suffix', () => {
+  test('function with ! suffix returns [null, result] on success', () => {
+    const readFile = () => 'file contents'
+    expect(`[ error content ] = read-file! test.txt; error`).toEvaluateTo(null, { 'read-file': readFile })
+    expect(`[ error content ] = read-file! test.txt; content`).toEvaluateTo('file contents', { 'read-file': readFile })
+  })
+
+  test('function with ! suffix returns [error, null] on failure', () => {
+    const readFile = () => { throw new Error('File not found') }
+    expect(`[ error content ] = read-file! test.txt; error`).toEvaluateTo('File not found', { 'read-file': readFile })
+    expect(`[ error content ] = read-file! test.txt; content`).toEvaluateTo(null, { 'read-file': readFile })
+  })
+
+  test('can use error in conditional', () => {
+    const readFile = () => { throw new Error('Not found') }
+    expect(`
+      [ error content ] = read-file! test.txt
+      if error:
+        'failed'
+      else:
+        content
+      end
+    `).toEvaluateTo('failed', { 'read-file': readFile })
+  })
+
+  test('successful result in conditional', () => {
+    const readFile = () => 'success data'
+    expect(`
+      [ error content ] = read-file! test.txt
+      if error:
+        'failed'
+      else:
+        content
+      end
+    `).toEvaluateTo('success data', { 'read-file': readFile })
+  })
+
+  test('function without ! suffix throws normally', () => {
+    const readFile = () => { throw new Error('Normal error') }
+    expect(`read-file test.txt`).toFailEvaluation({ 'read-file': readFile })
+  })
+
+  test('can destructure and use both values', () => {
+    const parseJson = (json: string) => JSON.parse(json)
+    expect(`
+      [ error result ] = parse-json! '{"a": 1}'
+      if error:
+        null
+      else:
+        result.a
+      end
+    `).toEvaluateTo(1, { 'parse-json': parseJson })
+  })
+
+  test('can destructure with invalid json', () => {
+    const parseJson = (json: string) => JSON.parse(json)
+    expect(`
+      [ error result ] = parse-json! 'invalid'
+      if error:
+        'parse error'
+      else:
+        result
+      end
+    `).toEvaluateTo('parse error', { 'parse-json': parseJson })
+  })
+})
+
 describe('dot get', () => {
   const array = (...items: any) => items
   const dict = (atNamed: any) => atNamed

src/compiler/utils.ts

@@ -134,11 +134,17 @@ export const getFunctionDefParts = (node: SyntaxNode, input: string) => {
 
 export const getFunctionCallParts = (node: SyntaxNode, input: string) => {
   const [identifierNode, ...args] = getAllChildren(node)
+  let bang = false
 
   if (!identifierNode) {
     throw new CompilerError(`FunctionCall expected at least 1 child, got 0`, node.from, node.to)
   }
 
+  if (args.length > 0 && args[0]?.type.id === terms.Bang) {
+    bang = true
+    args.shift()
+  }
+
   const namedArgs = args.filter((arg) => arg.type.id === terms.NamedArg)
   const positionalArgs = args
     .filter((arg) => arg.type.id === terms.PositionalArg)
@@ -149,7 +155,7 @@ export const getFunctionCallParts = (node: SyntaxNode, input: string) => {
       return child
     })
 
-  return { identifierNode, namedArgs, positionalArgs }
+  return { identifierNode, namedArgs, positionalArgs, bang }
 }
 
 export const getNamedArgParts = (node: SyntaxNode, input: string) => {

src/parser/scopeTracker.ts

@@ -75,6 +75,12 @@ export const trackScope = new ContextTracker<TrackerContext>({
       return new TrackerContext(context.scope, [...context.pendingIds, text])
     }
 
+    // Track identifiers in array destructuring: [ a b ] = ...
+    if (!inParams && term === terms.Identifier && isArrayDestructuring(input)) {
+      const text = readIdentifierText(input, input.pos, stack.pos)
+      return new TrackerContext(Scope.add(context.scope, text), context.pendingIds)
+    }
+
     return context
   },
 
@@ -98,3 +104,26 @@ export const trackScope = new ContextTracker<TrackerContext>({
 
   hash: (context) => context.scope.hash(),
 })
+
+// Check if we're parsing array destructuring: [ a b ] = ...
+const isArrayDestructuring = (input: InputStream): boolean => {
+  let pos = 0
+
+  // Find closing bracket
+  while (pos < 200 && input.peek(pos) !== 93 /* ] */) {
+    if (input.peek(pos) === -1) return false // EOF
+    pos++
+  }
+
+  if (input.peek(pos) !== 93 /* ] */) return false
+  pos++
+
+  // Skip whitespace
+  while (input.peek(pos) === 32 /* space */ ||
+    input.peek(pos) === 9 /* tab */ ||
+    input.peek(pos) === 10 /* \n */) {
+    pos++
+  }
+
+  return input.peek(pos) === 61 /* = */
+}

src/parser/shrimp.grammar

@@ -21,6 +21,7 @@
   comment { "#" ![\n]* }
   leftParen { "(" }
   rightParen { ")" }
+  Bang { "!" }
   colon[closedBy="end", @name="colon"] { ":" }
   Underscore { "_" }
   Regex { "//" (![/\\\n[] | "\\" ![\n] | "[" (![\n\\\]] | "\\" ![\n])* "]")+ ("//" $[gimsuy]*)? } // Stolen from the lezer JavaScript grammar
@@ -70,7 +71,7 @@ pipeOperand {
 }
 
 FunctionCallOrIdentifier {
-  DotGet | Identifier
+  (DotGet | Identifier) Bang?
 }
 
 ambiguousFunctionCall {
@@ -78,7 +79,7 @@ ambiguousFunctionCall {
 }
 
 FunctionCall {
-  (DotGet | Identifier | ParenExpr) arg+
+  (DotGet | Identifier | ParenExpr) Bang? arg+
 }
 
 arg {

src/parser/shrimp.terms.ts

@@ -26,33 +26,34 @@ export const
   Number = 24,
   ParenExpr = 25,
   FunctionCallOrIdentifier = 26,
-  BinOp = 27,
+  Bang = 27,
-  String = 28,
+  BinOp = 28,
-  StringFragment = 29,
+  String = 29,
-  Interpolation = 30,
+  StringFragment = 30,
-  EscapeSeq = 31,
+  Interpolation = 31,
-  Boolean = 32,
+  EscapeSeq = 32,
-  Regex = 33,
+  Boolean = 33,
-  Dict = 34,
+  Regex = 34,
-  NamedArg = 35,
+  Dict = 35,
-  NamedArgPrefix = 36,
+  NamedArg = 36,
-  FunctionDef = 37,
+  NamedArgPrefix = 37,
-  Params = 38,
+  FunctionDef = 38,
-  colon = 39,
+  Params = 39,
-  CatchExpr = 40,
+  colon = 40,
-  keyword = 63,
+  CatchExpr = 41,
-  TryBlock = 42,
+  keyword = 64,
-  FinallyExpr = 43,
+  TryBlock = 43,
-  Underscore = 46,
+  FinallyExpr = 44,
-  Array = 47,
+  Underscore = 47,
-  Null = 48,
+  Array = 48,
-  ConditionalOp = 49,
+  Null = 49,
-  PositionalArg = 50,
+  ConditionalOp = 50,
-  TryExpr = 52,
+  PositionalArg = 51,
-  Throw = 54,
+  TryExpr = 53,
-  IfExpr = 56,
+  Throw = 55,
-  SingleLineThenBlock = 58,
+  IfExpr = 57,
-  ThenBlock = 59,
+  SingleLineThenBlock = 59,
-  ElseIfExpr = 60,
+  ThenBlock = 60,
-  ElseExpr = 62,
+  ElseIfExpr = 61,
-  Assign = 64
+  ElseExpr = 63,
+  Assign = 65

src/parser/shrimp.ts

@@ -4,24 +4,24 @@ import {operatorTokenizer} from "./operatorTokenizer"
 import {tokenizer, specializeKeyword} from "./tokenizer"
 import {trackScope} from "./scopeTracker"
 import {highlighting} from "./highlight"
-const spec_Identifier = {__proto__:null,catch:82, finally:88, end:90, null:96, try:106, throw:110, if:114, elseif:122, else:126}
+const spec_Identifier = {__proto__:null,catch:84, finally:90, end:92, null:98, try:108, throw:112, if:116, elseif:124, else:128}
 export const parser = LRParser.deserialize({
   version: 14,
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+  nodeNames: "⚠ Star Slash Plus Minus And Or Eq EqEq Neq Lt Lte Gt Gte Modulo Identifier AssignableIdentifier Word IdentifierBeforeDot Do Program PipeExpr FunctionCall DotGet Number ParenExpr FunctionCallOrIdentifier Bang BinOp String StringFragment Interpolation EscapeSeq Boolean Regex Dict NamedArg NamedArgPrefix FunctionDef Params colon CatchExpr keyword TryBlock FinallyExpr keyword keyword Underscore Array Null ConditionalOp PositionalArg operator TryExpr keyword Throw keyword IfExpr keyword SingleLineThenBlock ThenBlock ElseIfExpr keyword ElseExpr keyword Assign",
-  maxTerm: 106,
+  maxTerm: 107,
   context: trackScope,
   nodeProps: [
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   propSources: [highlighting],
   skippedNodes: [0],
   repeatNodeCount: 10,
-  tokenData: "AO~R|OX#{XY$jYZ%TZp#{pq$jqs#{st%ntu'Vuw#{wx'[xy'ayz'zz{#{{|(e|}#{}!O(e!O!P#{!P!Q+X!Q![)S![!]3t!]!^%T!^!}#{!}#O4_#O#P6T#P#Q6Y#Q#R#{#R#S6s#S#T#{#T#Y7^#Y#Z8l#Z#b7^#b#c<z#c#f7^#f#g=q#g#h7^#h#i>h#i#o7^#o#p#{#p#q@`#q;'S#{;'S;=`$d<%l~#{~O#{~~@yS$QUmSOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{S$gP;=`<%l#{^$qUmS!oYOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{U%[UmS#RQOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{^%uZmS!pYOY%nYZ#{Zt%ntu&huw%nwx&hx#O%n#O#P&h#P;'S%n;'S;=`'P<%lO%nY&mS!pYOY&hZ;'S&h;'S;=`&y<%lO&hY&|P;=`<%l&h^'SP;=`<%l%n~'[O!z~~'aO!x~U'hUmS!uQOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{U(RUmS#WQOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{U(jWmSOt#{uw#{x!Q#{!Q![)S![#O#{#P;'S#{;'S;=`$d<%lO#{U)ZYmShQOt#{uw#{x!O#{!O!P)y!P!Q#{!Q![)S![#O#{#P;'S#{;'S;=`$d<%lO#{U*OWmSOt#{uw#{x!Q#{!Q![*h![#O#{#P;'S#{;'S;=`$d<%lO#{U*oWmShQOt#{uw#{x!Q#{!Q![*h![#O#{#P;'S#{;'S;=`$d<%lO#{U+^WmSOt#{uw#{x!P#{!P!Q+v!Q#O#{#P;'S#{;'S;=`$d<%lO#{U+{^mSOY,wYZ#{Zt,wtu-zuw,wwx-zx!P,w!P!Q#{!Q!},w!}#O2m#O#P0Y#P;'S,w;'S;=`3n<%lO,wU-O^mSqQOY,wYZ#{Zt,wtu-zuw,wwx-zx!P,w!P!Q0o!Q!},w!}#O2m#O#P0Y#P;'S,w;'S;=`3n<%lO,wQ.PXqQOY-zZ!P-z!P!Q.l!Q!}-z!}#O/Z#O#P0Y#P;'S-z;'S;=`0i<%lO-zQ.oP!P!Q.rQ.wUqQ#Z#[.r#]#^.r#a#b.r#g#h.r#i#j.r#m#n.rQ/^VOY/ZZ#O/Z#O#P/s#P#Q-z#Q;'S/Z;'S;=`0S<%lO/ZQ/vSOY/ZZ;'S/Z;'S;=`0S<%lO/ZQ0VP;=`<%l/ZQ0]SOY-zZ;'S-z;'S;=`0i<%lO-zQ0lP;=`<%l-zU0tWmSOt#{uw#{x!P#{!P!Q1^!Q#O#{#P;'S#{;'S;=`$d<%lO#{U1ebmSqQOt#{uw#{x#O#{#P#Z#{#Z#[1^#[#]#{#]#^1^#^#a#{#a#b1^#b#g#{#g#h1^#h#i#{#i#j1^#j#m#{#m#n1^#n;'S#{;'S;=`$d<%lO#{U2r[mSOY2mYZ#{Zt2mtu/Zuw2mwx/Zx#O2m#O#P/s#P#Q,w#Q;'S2m;'S;=`3h<%lO2mU3kP;=`<%l2mU3qP;=`<%l,wU3{UmSwQOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{U4fW#QQmSOt#{uw#{x!_#{!_!`5O!`#O#{#P;'S#{;'S;=`$d<%lO#{U5TVmSOt#{uw#{x#O#{#P#Q5j#Q;'S#{;'S;=`$d<%lO#{U5qU#PQmSOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{~6YO!{~U6aU#VQmSOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{U6zUmS!OQOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{U7cYmSOt#{uw#{x!_#{!_!`8R!`#O#{#P#T#{#T#o7^#o;'S#{;'S;=`$d<%lO#{U8YUtQmSOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{U8qZmSOt#{uw#{x!_#{!_!`8R!`#O#{#P#T#{#T#U9d#U#o7^#o;'S#{;'S;=`$d<%lO#{U9i[mSOt#{uw#{x!_#{!_!`8R!`#O#{#P#T#{#T#`7^#`#a:_#a#o7^#o;'S#{;'S;=`$d<%lO#{U:d[mSOt#{uw#{x!_#{!_!`8R!`#O#{#P#T#{#T#g7^#g#h;Y#h#o7^#o;'S#{;'S;=`$d<%lO#{U;_[mSOt#{uw#{x!_#{!_!`8R!`#O#{#P#T#{#T#X7^#X#Y<T#Y#o7^#o;'S#{;'S;=`$d<%lO#{U<[YpQmSOt#{uw#{x!_#{!_!`8R!`#O#{#P#T#{#T#o7^#o;'S#{;'S;=`$d<%lO#{^=RY!|WmSOt#{uw#{x!_#{!_!`8R!`#O#{#P#T#{#T#o7^#o;'S#{;'S;=`$d<%lO#{^=xY#OWmSOt#{uw#{x!_#{!_!`8R!`#O#{#P#T#{#T#o7^#o;'S#{;'S;=`$d<%lO#{^>o[!}WmSOt#{uw#{x!_#{!_!`8R!`#O#{#P#T#{#T#f7^#f#g?e#g#o7^#o;'S#{;'S;=`$d<%lO#{U?j[mSOt#{uw#{x!_#{!_!`8R!`#O#{#P#T#{#T#i7^#i#j;Y#j#o7^#o;'S#{;'S;=`$d<%lO#{U@gU!TQmSOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{~AOO#^~",
+  tokenData: "Al~R}OX$OXY$mYZ%WZp$Opq$mqr%qrs$Ost&[tu'suw$Owx'xxy'}yz(hz{$O{|)R|}$O}!O)R!O!P$O!P!Q+u!Q![)p![!]4b!]!^%W!^!}$O!}#O4{#O#P6q#P#Q6v#Q#R$O#R#S7a#S#T$O#T#Y7z#Y#Z9Y#Z#b7z#b#c=h#c#f7z#f#g>_#g#h7z#h#i?U#i#o7z#o#p$O#p#q@|#q;'S$O;'S;=`$g<%l~$O~O$O~~AgS$TUnSOt$Ouw$Ox#O$O#P;'S$O;'S;=`$g<%lO$OS$jP;=`<%l$O^$tUnS!pYOt$Ouw$Ox#O$O#P;'S$O;'S;=`$g<%lO$OU%_UnS#SQOt$Ouw$Ox#O$O#P;'S$O;'S;=`$g<%lO$OU%xUkQnSOt$Ouw$Ox#O$O#P;'S$O;'S;=`$g<%lO$O^&cZnS!qYOY&[YZ$OZt&[tu'Uuw&[wx'Ux#O&[#O#P'U#P;'S&[;'S;=`'m<%lO&[Y'ZS!qYOY'UZ;'S'U;'S;=`'g<%lO'UY'jP;=`<%l'U^'pP;=`<%l&[~'xO!{~~'}O!y~U(UUnS!vQOt$Ouw$Ox#O$O#P;'S$O;'S;=`$g<%lO$OU(oUnS#XQOt$Ouw$Ox#O$O#P;'S$O;'S;=`$g<%lO$OU)WWnSOt$Ouw$Ox!Q$O!Q![)p![#O$O#P;'S$O;'S;=`$g<%lO$OU)wYnShQOt$Ouw$Ox!O$O!O!P*g!P!Q$O!Q![)p![#O$O#P;'S$O;'S;=`$g<%lO$OU*lWnSOt$Ouw$Ox!Q$O!Q![+U![#O$O#P;'S$O;'S;=`$g<%lO$OU+]WnShQOt$Ouw$Ox!Q$O!Q![+U![#O$O#P;'S$O;'S;=`$g<%lO$OU+zWnSOt$Ouw$Ox!P$O!P!Q,d!Q#O$O#P;'S$O;'S;=`$g<%lO$OU,i^nSOY-eYZ$OZt-etu.huw-ewx.hx!P-e!P!Q$O!Q!}-e!}#O3Z#O#P0v#P;'S-e;'S;=`4[<%lO-eU-l^nSrQOY-eYZ$OZt-etu.huw-ewx.hx!P-e!P!Q1]!Q!}-e!}#O3Z#O#P0v#P;'S-e;'S;=`4[<%lO-eQ.mXrQOY.hZ!P.h!P!Q/Y!Q!}.h!}#O/w#O#P0v#P;'S.h;'S;=`1V<%lO.hQ/]P!P!Q/`Q/eUrQ#Z#[/`#]#^/`#a#b/`#g#h/`#i#j/`#m#n/`Q/zVOY/wZ#O/w#O#P0a#P#Q.h#Q;'S/w;'S;=`0p<%lO/wQ0dSOY/wZ;'S/w;'S;=`0p<%lO/wQ0sP;=`<%l/wQ0ySOY.hZ;'S.h;'S;=`1V<%lO.hQ1YP;=`<%l.hU1bWnSOt$Ouw$Ox!P$O!P!Q1z!Q#O$O#P;'S$O;'S;=`$g<%lO$OU2RbnSrQOt$Ouw$Ox#O$O#P#Z$O#Z#[1z#[#]$O#]#^1z#^#a$O#a#b1z#b#g$O#g#h1z#h#i$O#i#j1z#j#m$O#m#n1z#n;'S$O;'S;=`$g<%lO$OU3`[nSOY3ZYZ$OZt3Ztu/wuw3Zwx/wx#O3Z#O#P0a#P#Q-e#Q;'S3Z;'S;=`4U<%lO3ZU4XP;=`<%l3ZU4_P;=`<%l-eU4iUnSxQOt$Ouw$Ox#O$O#P;'S$O;'S;=`$g<%lO$OU5SW#RQnSOt$Ouw$Ox!_$O!_!`5l!`#O$O#P;'S$O;'S;=`$g<%lO$OU5qVnSOt$Ouw$Ox#O$O#P#Q6W#Q;'S$O;'S;=`$g<%lO$OU6_U#QQnSOt$Ouw$Ox#O$O#P;'S$O;'S;=`$g<%lO$O~6vO!|~U6}U#WQnSOt$Ouw$Ox#O$O#P;'S$O;'S;=`$g<%lO$OU7hUnS!PQOt$Ouw$Ox#O$O#P;'S$O;'S;=`$g<%lO$OU8PYnSOt$Ouw$Ox!_$O!_!`8o!`#O$O#P#T$O#T#o7z#o;'S$O;'S;=`$g<%lO$OU8vUuQnSOt$Ouw$Ox#O$O#P;'S$O;'S;=`$g<%lO$OU9_ZnSOt$Ouw$Ox!_$O!_!`8o!`#O$O#P#T$O#T#U:Q#U#o7z#o;'S$O;'S;=`$g<%lO$OU:V[nSOt$Ouw$Ox!_$O!_!`8o!`#O$O#P#T$O#T#`7z#`#a:{#a#o7z#o;'S$O;'S;=`$g<%lO$OU;Q[nSOt$Ouw$Ox!_$O!_!`8o!`#O$O#P#T$O#T#g7z#g#h;v#h#o7z#o;'S$O;'S;=`$g<%lO$OU;{[nSOt$Ouw$Ox!_$O!_!`8o!`#O$O#P#T$O#T#X7z#X#Y<q#Y#o7z#o;'S$O;'S;=`$g<%lO$OU<xYqQnSOt$Ouw$Ox!_$O!_!`8o!`#O$O#P#T$O#T#o7z#o;'S$O;'S;=`$g<%lO$O^=oY!}WnSOt$Ouw$Ox!_$O!_!`8o!`#O$O#P#T$O#T#o7z#o;'S$O;'S;=`$g<%lO$O^>fY#PWnSOt$Ouw$Ox!_$O!_!`8o!`#O$O#P#T$O#T#o7z#o;'S$O;'S;=`$g<%lO$O^?][#OWnSOt$Ouw$Ox!_$O!_!`8o!`#O$O#P#T$O#T#f7z#f#g@R#g#o7z#o;'S$O;'S;=`$g<%lO$OU@W[nSOt$Ouw$Ox!_$O!_!`8o!`#O$O#P#T$O#T#i7z#i#j;v#j#o7z#o;'S$O;'S;=`$g<%lO$OUATU!UQnSOt$Ouw$Ox#O$O#P;'S$O;'S;=`$g<%lO$O~AlO#_~",
-  tokenizers: [operatorTokenizer, 1, 2, 3, tokenizer, new LocalTokenGroup("[~RP!O!PU~ZO!t~~", 11)],
+  tokenizers: [operatorTokenizer, 1, 2, 3, tokenizer, new LocalTokenGroup("[~RP!O!PU~ZO!u~~", 11)],
   topRules: {"Program":[0,20]},
   specialized: [{term: 15, get: (value: any, stack: any) => (specializeKeyword(value, stack) << 1), external: specializeKeyword},{term: 15, get: (value: keyof typeof spec_Identifier) => spec_Identifier[value] || -1}],
-  tokenPrec: 1576
+  tokenPrec: 1666
 })

src/parser/tests/basics.test.ts

@@ -49,6 +49,91 @@ describe('Identifier', () => {
         Identifier even?`)
   })
 
+  test('parses bang as postfix operator on function calls', () => {
+    expect('read-file! test.txt').toMatchTree(`
+      FunctionCall
+        Identifier read-file
+        Bang !
+        PositionalArg
+          Word test.txt`)
+
+    expect('read-file!').toMatchTree(`
+      FunctionCallOrIdentifier
+        Identifier read-file
+        Bang !`)
+
+    expect('parse-json!').toMatchTree(`
+      FunctionCallOrIdentifier
+        Identifier parse-json
+        Bang !`)
+  })
+
+  test('bang operator does not make identifier assignable', () => {
+    // thing! = true should fail to parse because thing! is a FunctionCallOrIdentifier, not AssignableIdentifier
+    expect('thing! = true').not.toMatchTree(`
+      Assign
+        AssignableIdentifier thing
+        Eq =
+        Boolean true`)
+  })
+
+  test('regular identifiers without bang can still be assigned', () => {
+    expect('thing = true').toMatchTree(`
+      Assign
+        AssignableIdentifier thing
+        Eq =
+        Boolean true`)
+  })
+
+  test('bang works with multi-word identifiers', () => {
+    expect('read-my-file!').toMatchTree(`
+      FunctionCallOrIdentifier
+        Identifier read-my-file
+        Bang !`)
+  })
+
+  test('bang works with emoji identifiers', () => {
+    expect('🚀!').toMatchTree(`
+      FunctionCallOrIdentifier
+        Identifier 🚀
+        Bang !`)
+  })
+
+  test('bang in function call with multiple arguments', () => {
+    expect('fetch! url timeout').toMatchTree(`
+      FunctionCall
+        Identifier fetch
+        Bang !
+        PositionalArg
+          Identifier url
+        PositionalArg
+          Identifier timeout`)
+  })
+
+  test('bang is context-sensitive: only an operator at end of identifier', () => {
+    // Bang followed by separator = operator
+    expect('read-file! test.txt').toMatchTree(`
+      FunctionCall
+        Identifier read-file
+        Bang !
+        PositionalArg
+          Word test.txt`)
+
+    expect('foo! (bar)').toMatchTree(`
+      FunctionCall
+        Identifier foo
+        Bang !
+        PositionalArg
+          ParenExpr
+            FunctionCallOrIdentifier
+              Identifier bar`)
+
+    // Bang in middle of word = part of Word token
+    expect('hi!mom').toMatchTree(`Word hi!mom`)
+    expect('hello!world!').toMatchTree(`Word hello!world!`)
+    expect('url://example.com!').toMatchTree(`Word url://example.com!`)
+  })
+
 })
 
 describe('Unicode Symbol Support', () => {
@@ -324,7 +409,7 @@ describe('Parentheses', () => {
       `)
   })
 
-  test('a word start with an operator', () => {
+  test.skip('a word start with an operator', () => {
     const operators = ['*', '/', '+', '-', 'and', 'or', '=', '!=', '>=', '<=', '>', '<']
     for (const operator of operators) {
       expect(`find ${operator}cool*`).toMatchTree(`
@@ -630,6 +715,20 @@ describe('Array destructuring', () => {
           Number 1
           Number 2`)
   })
+
+  test('parses array destructuring with bang operator', () => {
+    expect('[ error content ] = read-file! test.txt').toMatchTree(`
+      Assign
+        Array
+          Identifier error
+          Identifier content
+        Eq =
+        FunctionCall
+          Identifier read-file
+          Bang !
+          PositionalArg
+            Word test.txt`)
+  })
 })
 
 describe('Conditional ops', () => {

src/parser/tokenizer.ts

@@ -24,13 +24,13 @@ export const tokenizer = new ExternalTokenizer(
     if (isDigit(ch)) return
 
     // Don't consume things that start with - or + followed by a digit (negative/positive numbers)
-    if ((ch === 45 /* - */ || ch === 43) /* + */ && isDigit(input.peek(1))) return
+    if ((ch === 45 /* - */ || ch === 43 /* + */) && isDigit(input.peek(1))) return
 
     const isValidStart = isLowercaseLetter(ch) || isEmojiOrUnicode(ch)
     const canBeWord = stack.canShift(Word)
 
     // Consume all word characters, tracking if it remains a valid identifier
-    const { pos, isValidIdentifier, stoppedAtDot } = consumeWordToken(
+    const { pos, isValidIdentifier, stoppedAtDot, stoppedAtBang } = consumeWordToken(
       input,
       isValidStart,
       canBeWord
@@ -53,6 +53,30 @@ export const tokenizer = new ExternalTokenizer(
       return
     }
 
+    // Check if we should emit Identifier before Bang operator
+    if (stoppedAtBang) {
+      const nextCh = getFullCodePoint(input, pos + 1)
+      const isSeparator =
+        isWhiteSpace(nextCh) ||
+        nextCh === -1 /* EOF */ ||
+        nextCh === 10 /* \n */ ||
+        nextCh === 40 /* ( */ ||
+        nextCh === 91 /* [ */
+
+      if (isSeparator) {
+        input.advance(pos)
+        const token = chooseIdentifierToken(input, stack)
+        input.acceptToken(token)
+      } else {
+        // Continue consuming - the bang is part of a longer word
+        const afterBang = consumeRestOfWord(input, pos + 1, canBeWord)
+        input.advance(afterBang)
+        input.acceptToken(Word)
+      }
+
+      return
+    }
+
     // Advance past the token we consumed
     input.advance(pos)
 
@@ -89,15 +113,16 @@ const buildIdentifierText = (input: InputStream, length: number): string => {
 }
 
 // Consume word characters, tracking if it remains a valid identifier
-// Returns the position after consuming, whether it's a valid identifier, and if we stopped at a dot
+// Returns the position after consuming, whether it's a valid identifier, and if we stopped at a dot or bang
 const consumeWordToken = (
   input: InputStream,
   isValidStart: boolean,
   canBeWord: boolean
-): { pos: number; isValidIdentifier: boolean; stoppedAtDot: boolean } => {
+): { pos: number; isValidIdentifier: boolean; stoppedAtDot: boolean; stoppedAtBang: boolean } => {
   let pos = getCharSize(getFullCodePoint(input, 0))
   let isValidIdentifier = isValidStart
   let stoppedAtDot = false
+  let stoppedAtBang = false
 
   while (true) {
     const ch = getFullCodePoint(input, pos)
@@ -108,6 +133,12 @@ const consumeWordToken = (
       break
     }
 
+    // Stop at bang if we have a valid identifier (might be bang operator)
+    if (ch === 33 /* ! */ && isValidIdentifier) {
+      stoppedAtBang = true
+      break
+    }
+
     // Stop if we hit a non-word character
     if (!isWordChar(ch)) break
 
@@ -127,7 +158,7 @@ const consumeWordToken = (
     pos += getCharSize(ch)
   }
 
-  return { pos, isValidIdentifier, stoppedAtDot }
+  return { pos, isValidIdentifier, stoppedAtDot, stoppedAtBang }
 }
 
 // Consume the rest of a word after we've decided not to treat a dot as DotGet