interpolation in { curly strings }

src/compiler/compiler.ts

@@ -2,6 +2,7 @@ import { CompilerError } from '#compiler/compilerError.ts'
 import { parser } from '#parser/shrimp.ts'
 import * as terms from '#parser/shrimp.terms'
 import { setGlobals } from '#parser/tokenizer'
+import { tokenizeCurlyString } from '#parser/curlyTokenizer'
 import type { SyntaxNode, Tree } from '@lezer/common'
 import { assert, errorMessage } from '#utils/utils'
 import { toBytecode, type Bytecode, type ProgramItem, bytecodeToString } from 'reefvm'
@@ -112,6 +113,9 @@ export class Compiler {
         return [[`PUSH`, number]]
 
       case terms.String: {
+        if (node.firstChild?.type.id === terms.CurlyString)
+          return this.#compileCurlyString(value, input)
+
         const { parts, hasInterpolation } = getStringParts(node, input)
 
         // Simple string without interpolation or escapes - extract text directly
@@ -772,4 +776,26 @@ export class Compiler {
 
     return instructions
   }
+
+  #compileCurlyString(value: string, input: string): ProgramItem[] {
+    const instructions: ProgramItem[] = []
+    const nodes = tokenizeCurlyString(value)
+
+    nodes.forEach((node) => {
+      if (typeof node === 'string') {
+        instructions.push(['PUSH', node])
+      } else {
+        const [input, topNode] = node
+        let child = topNode.topNode.firstChild
+        while (child) {
+          instructions.push(...this.#compileNode(child, input))
+          child = child.nextSibling
+        }
+      }
+    })
+
+    instructions.push(['STR_CONCAT', nodes.length])
+
+    return instructions
+  }
 }

src/compiler/tests/literals.test.ts

@@ -177,7 +177,20 @@ describe('curly strings', () => {
     }`).toEvaluateTo("\n      { one }\n      two\n      { three }\n    ")
   })
 
-  test("don't interpolate", () => {
-    expect(`{ sum is $(a + b)! }`).toEvaluateTo(` sum is $(a + b)! `)
+  test('interpolates variables', () => {
+    expect(`name = Bob; { Hello $name! }`).toEvaluateTo(` Hello Bob! `)
+  })
+
+  test("doesn't interpolate escaped variables ", () => {
+    expect(`name = Bob; { Hello \\$name }`).toEvaluateTo(` Hello $name `)
+    expect(`a = 1; b = 2; { sum is \\$(a + b)! }`).toEvaluateTo(` sum is $(a + b)! `)
+  })
+
+  test('interpolates expressions', () => {
+    expect(`a = 1; b = 2; { sum is $(a + b)! }`).toEvaluateTo(` sum is 3! `)
+    expect(`a = 1; b = 2; { sum is { $(a + b) }! }`).toEvaluateTo(` sum is { 3 }! `)
+    expect(`a = 1; b = 2; { sum is $(a + (b * b))! }`).toEvaluateTo(` sum is 5! `)
+    expect(`{ This is $({twisted}). }`).toEvaluateTo(` This is twisted. `)
+    expect(`{ This is $({{twisted}}). }`).toEvaluateTo(` This is {twisted}. `)
   })
 })

src/compiler/utils.ts

@@ -251,7 +251,9 @@ export const getStringParts = (node: SyntaxNode, input: string) => {
     return (
       child.type.id === terms.StringFragment ||
       child.type.id === terms.Interpolation ||
-      child.type.id === terms.EscapeSeq
+      child.type.id === terms.EscapeSeq ||
+      child.type.id === terms.CurlyString
+
     )
   })
 
@@ -260,7 +262,8 @@ export const getStringParts = (node: SyntaxNode, input: string) => {
     if (
       part.type.id !== terms.StringFragment &&
       part.type.id !== terms.Interpolation &&
-      part.type.id !== terms.EscapeSeq
+      part.type.id !== terms.EscapeSeq &&
+      part.type.id !== terms.CurlyString
     ) {
       throw new CompilerError(
         `String child must be StringFragment, Interpolation, or EscapeSeq, got ${part.type.name}`,

src/parser/curlyTokenizer.ts

@@ -0,0 +1,62 @@
+import { parser } from '#parser/shrimp.ts'
+import type { Tree } from '@lezer/common'
+import { isIdentStart, isIdentChar } from './tokenizer'
+
+// Turns a { curly string } into separate tokens for interpolation
+export const tokenizeCurlyString = (value: string): (string | [string, Tree])[] => {
+  let pos = 1
+  let start = 1
+  let char = value[pos]
+  const tokens: (string | [string, Tree])[] = []
+
+  while (pos < value.length) {
+    if (char === '$') {
+      // escaped \$
+      if (value[pos - 1] === '\\' && value[pos - 2] !== '\\') {
+        tokens.push(value.slice(start, pos - 1))
+        start = pos
+        char = value[++pos]
+        continue
+      }
+
+      tokens.push(value.slice(start, pos))
+      start = pos
+
+      if (value[pos + 1] === '(') {
+        pos++ // slip opening '('
+
+        char = value[++pos]
+        if (!char) break
+
+        let depth = 0
+        while (char) {
+          if (char === '(') depth++
+          if (char === ')') depth--
+          if (depth < 0) break
+          char = value[++pos]
+        }
+
+        const input = value.slice(start + 2, pos) // skip '$('
+        tokens.push([input, parser.parse(input)])
+        start = ++pos // skip ')'
+      } else {
+        char = value[++pos]
+        if (!char) break
+        if (!isIdentStart(char.charCodeAt(0))) break
+
+        while (char && isIdentChar(char.charCodeAt(0)))
+          char = value[++pos]
+
+        const input = value.slice(start + 1, pos) // skip '$'
+        tokens.push([input, parser.parse(input)])
+        start = pos
+      }
+    }
+
+    char = value[++pos]
+  }
+
+  tokens.push(value.slice(start, pos - 1))
+
+  return tokens
+}

src/parser/shrimp.grammar

@@ -37,7 +37,7 @@ finally { @specialize[@name=keyword]<Identifier, "finally"> }
 throw { @specialize[@name=keyword]<Identifier, "throw"> }
 null { @specialize[@name=Null]<Identifier, "null"> }
 
-@external tokens tokenizer from "./tokenizer" { Identifier, AssignableIdentifier, Word, IdentifierBeforeDot, curlyString }
+@external tokens tokenizer from "./tokenizer" { Identifier, AssignableIdentifier, Word, IdentifierBeforeDot, CurlyString }
 @external specialize {Identifier} specializeKeyword from "./tokenizer" { Do }
 
 @precedence {
@@ -206,7 +206,7 @@ expression {
   }
 
   String { 
-    "'" stringContent* "'" | curlyString
+    "'" stringContent* "'" | CurlyString
   }
 }
 

src/parser/shrimp.terms.ts

@@ -23,45 +23,45 @@ export const
   AssignableIdentifier = 21,
   Word = 22,
   IdentifierBeforeDot = 23,
-  curlyString = 85,
-  Do = 24,
-  Comment = 25,
-  Program = 26,
-  PipeExpr = 27,
-  FunctionCall = 28,
-  DotGet = 29,
-  Number = 30,
-  ParenExpr = 31,
-  IfExpr = 32,
-  keyword = 70,
-  ConditionalOp = 34,
-  String = 35,
-  StringFragment = 36,
-  Interpolation = 37,
-  EscapeSeq = 38,
-  Boolean = 39,
-  Regex = 40,
-  Dict = 41,
-  NamedArg = 42,
-  NamedArgPrefix = 43,
-  FunctionDef = 44,
-  Params = 45,
-  NamedParam = 46,
-  Null = 47,
-  colon = 48,
-  CatchExpr = 49,
-  Block = 51,
-  FinallyExpr = 52,
-  Underscore = 55,
-  Array = 56,
-  ElseIfExpr = 57,
-  ElseExpr = 59,
-  FunctionCallOrIdentifier = 60,
-  BinOp = 61,
-  PositionalArg = 62,
-  WhileExpr = 64,
-  FunctionCallWithBlock = 66,
-  TryExpr = 67,
-  Throw = 69,
-  CompoundAssign = 71,
-  Assign = 72
+  CurlyString = 24,
+  Do = 25,
+  Comment = 26,
+  Program = 27,
+  PipeExpr = 28,
+  FunctionCall = 29,
+  DotGet = 30,
+  Number = 31,
+  ParenExpr = 32,
+  IfExpr = 33,
+  keyword = 71,
+  ConditionalOp = 35,
+  String = 36,
+  StringFragment = 37,
+  Interpolation = 38,
+  EscapeSeq = 39,
+  Boolean = 40,
+  Regex = 41,
+  Dict = 42,
+  NamedArg = 43,
+  NamedArgPrefix = 44,
+  FunctionDef = 45,
+  Params = 46,
+  NamedParam = 47,
+  Null = 48,
+  colon = 49,
+  CatchExpr = 50,
+  Block = 52,
+  FinallyExpr = 53,
+  Underscore = 56,
+  Array = 57,
+  ElseIfExpr = 58,
+  ElseExpr = 60,
+  FunctionCallOrIdentifier = 61,
+  BinOp = 62,
+  PositionalArg = 63,
+  WhileExpr = 65,
+  FunctionCallWithBlock = 67,
+  TryExpr = 68,
+  Throw = 70,
+  CompoundAssign = 72,
+  Assign = 73

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,if:66, null:94, catch:100, finally:106, end:108, else:116, while:130, try:136, throw:140}
+const spec_Identifier = {__proto__:null,if:68, null:96, catch:102, finally:108, end:110, else:118, while:132, try:138, throw:142}
 export const parser = LRParser.deserialize({
   version: 14,
-  states: "9bQYQbOOO!gOSO'#DPOOQa'#DP'#DPOOQa'#DV'#DVO#sQbO'#DfO%XQcO'#E_OOQa'#E_'#E_O&bQcO'#E_O'dQcO'#E^O'zQcO'#E^O)jQRO'#DOO*yQcO'#EXO+TQcO'#EXO+eQbO'#C{O,cOpO'#CyOOQ`'#EY'#EYO,hQbO'#EXO,rQRO'#DuOOQ`'#EX'#EXO-WQQO'#EWOOQ`'#EW'#EWOOQ`'#Dw'#DwQYQbOOO-`QbO'#DYO-kQbO'#C|O.cQbO'#DnO/ZQQO'#DqO.cQbO'#DsO/`QbO'#DRO/hQWO'#DSOOOO'#Ea'#EaOOOO'#Dx'#DxO/|OSO,59kOOQa,59k,59kOOQ`'#Dy'#DyO0[QbO,5:QO0cQbO'#DWO0mQQO,59qOOQa,5:Q,5:QO0xQbO,5:QOOQa'#E^'#E^OOQ`'#Dl'#DlOOQ`'#Em'#EmOOQ`'#EQ'#EQO1SQbO,59dO1|QbO,5:bO.cQbO,59jO.cQbO,59jO.cQbO,59jO.cQbO,5:VO.cQbO,5:VO.cQbO,5:VO2^QRO,59gO2eQRO,59gO2pQRO,59gO2kQQO,59gO3RQQO,59gO3ZObO,59eO3fQbO'#ERO3qQbO,59cO4]QbO,5:[O1|QbO,5:aOOQ`,5:r,5:rOOQ`-E7u-E7uOOQ`'#Dz'#DzO4pQbO'#DZO4{QbO'#D[OOQO'#D{'#D{O4sQQO'#DZO5^QQO,59tO5cQcO'#E^O6wQRO'#E]O7OQRO'#E]OOQO'#E]'#E]O7ZQQO,59hO7`QRO,5:YO7gQRO,5:YO4]QbO,5:]O7rQcO,5:_O8nQcO,5:_O8xQcO,5:_OOOO,59m,59mOOOO,59n,59nOOOO-E7v-E7vOOQa1G/V1G/VOOQ`-E7w-E7wO9YQQO1G/]OOQa1G/l1G/lO9eQbO1G/lOOQ`,59r,59rOOQO'#D}'#D}O9YQQO1G/]OOQa1G/]1G/]OOQ`'#EO'#EOO9eQbO1G/lOOQ`-E8O-E8OOOQ`1G/|1G/|OOQa1G/U1G/UO:pQcO1G/UO:wQcO1G/UO;OQcO1G/UOOQa1G/q1G/qO;wQcO1G/qO<RQcO1G/qO<]QcO1G/qOOQa1G/R1G/ROOQa1G/P1G/PO=QQbO'#DjO=wQbO'#CxOOQ`,5:m,5:mOOQ`-E8P-E8POOQ`'#Da'#DaO>UQbO'#DaO>uQbO1G/vOOQ`1G/{1G/{OOQ`-E7x-E7xO?QQQO,59uOOQO,59v,59vOOQO-E7y-E7yO?YQbO1G/`O4]QbO1G/SO4]QbO1G/tO?mQbO1G/wO?xQQO7+$wOOQa7+$w7+$wO@TQbO7+%WOOQa7+%W7+%WOOQO-E7{-E7{OOQ`-E7|-E7|OOQ`'#D|'#D|O@_QQO'#D|O@dQbO'#EjOOQ`,59{,59{OATQbO'#D_OAYQQO'#DbOOQ`7+%b7+%bOA_QbO7+%bOAdQbO7+%bOAlQbO7+$zOAwQbO7+$zOBeQbO7+$nOBmQbO7+%`OOQ`7+%c7+%cOBrQbO7+%cOBwQbO7+%cOOQa<<Hc<<HcOOQa<<Hr<<HrOOQ`,5:h,5:hOOQ`-E7z-E7zOCPQQO,59yO4]QbO,59|OOQ`<<H|<<H|OCUQbO<<H|OOQ`<<Hf<<HfOCZQbO<<HfOC`QbO<<HfOChQbO<<HfOOQ`'#EP'#EPOCsQbO<<HYOC{QbO'#DiOOQ`<<HY<<HYODTQbO<<HYOOQ`<<Hz<<HzOOQ`<<H}<<H}ODYQbO<<H}O4]QbO1G/eOOQ`1G/h1G/hOOQ`AN>hAN>hOOQ`AN>QAN>QOD_QbOAN>QODdQbOAN>QOOQ`-E7}-E7}OOQ`AN=tAN=tODlQbOAN=tO-kQbO,5:RO4]QbO,5:TOOQ`AN>iAN>iOOQ`7+%P7+%POOQ`G23lG23lODqQbOG23lPDvQbO'#DgOOQ`G23`G23`OD{QQO1G/mOOQ`1G/o1G/oOOQ`LD)WLD)WO4]QbO7+%XOOQ`<<Hs<<Hs",
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+  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;=`$d<%l~#{~O#{~~CwS$QUuSOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{S$gP;=`<%l#{^$qUuS!yYOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{U%[UuS#]QOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{^%sWuSOp#{pq&]qt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{^&dZjYuSOY&]YZ#{Zt&]tu'Vuw&]wx'Vx#O&]#O#P'V#P;'S&];'S;=`'n<%lO&]Y'[SjYOY'VZ;'S'V;'S;=`'h<%lO'VY'kP;=`<%l'V^'qP;=`<%l&]~'yO#U~~(OO#S~U(VUuS#OQOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{U(pUuS#`QOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{U)XWuSOt#{uw#{x!Q#{!Q![)q![#O#{#P;'S#{;'S;=`$d<%lO#{U)xYuSoQOt#{uw#{x!O#{!O!P*h!P!Q#{!Q![)q![#O#{#P;'S#{;'S;=`$d<%lO#{U*mWuSOt#{uw#{x!Q#{!Q![+V![#O#{#P;'S#{;'S;=`$d<%lO#{U+^WuSoQOt#{uw#{x!Q#{!Q![+V![#O#{#P;'S#{;'S;=`$d<%lO#{U+{^uSOt#{uw#{x}#{}!O,w!O!Q#{!Q![)q![!_#{!_!`-r!`#O#{#P#T#{#T#o,w#o;'S#{;'S;=`$d<%lO#{U,|[uSOt#{uw#{x}#{}!O,w!O!_#{!_!`-r!`#O#{#P#T#{#T#o,w#o;'S#{;'S;=`$d<%lO#{U-yU|QuSOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{U.bWuSOt#{uw#{x!P#{!P!Q.z!Q#O#{#P;'S#{;'S;=`$d<%lO#{U/P^uSOY/{YZ#{Zt/{tu1Ouw/{wx1Ox!P/{!P!Q#{!Q!}/{!}#O5q#O#P3^#P;'S/{;'S;=`6r<%lO/{U0S^uSyQOY/{YZ#{Zt/{tu1Ouw/{wx1Ox!P/{!P!Q3s!Q!}/{!}#O5q#O#P3^#P;'S/{;'S;=`6r<%lO/{Q1TXyQOY1OZ!P1O!P!Q1p!Q!}1O!}#O2_#O#P3^#P;'S1O;'S;=`3m<%lO1OQ1sP!P!Q1vQ1{UyQ#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;=`<%l1OU3xWuSOt#{uw#{x!P#{!P!Q4b!Q#O#{#P;'S#{;'S;=`$d<%lO#{U4ibuSyQOt#{uw#{x#O#{#P#Z#{#Z#[4b#[#]#{#]#^4b#^#a#{#a#b4b#b#g#{#g#h4b#h#i#{#i#j4b#j#m#{#m#n4b#n;'S#{;'S;=`$d<%lO#{U5v[uSOY5qYZ#{Zt5qtu2_uw5qwx2_x#O5q#O#P2w#P#Q/{#Q;'S5q;'S;=`6l<%lO5qU6oP;=`<%l5qU6uP;=`<%l/{U7PUuS!RQOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{U7jW#[QuSOt#{uw#{x!_#{!_!`8S!`#O#{#P;'S#{;'S;=`$d<%lO#{U8XVuSOt#{uw#{x#O#{#P#Q8n#Q;'S#{;'S;=`$d<%lO#{U8uU#ZQuSOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{~9^O#V~U9eU#_QuSOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{U:OUuS!YQOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{U:g]uSOt#{uw#{x}#{}!O,w!O!_#{!_!`-r!`#O#{#P#T#{#T#U;`#U#o,w#o;'S#{;'S;=`$d<%lO#{U;e^uSOt#{uw#{x}#{}!O,w!O!_#{!_!`-r!`#O#{#P#T#{#T#`,w#`#a<a#a#o,w#o;'S#{;'S;=`$d<%lO#{U<f^uSOt#{uw#{x}#{}!O,w!O!_#{!_!`-r!`#O#{#P#T#{#T#g,w#g#h=b#h#o,w#o;'S#{;'S;=`$d<%lO#{U=g^uSOt#{uw#{x}#{}!O,w!O!_#{!_!`-r!`#O#{#P#T#{#T#X,w#X#Y>c#Y#o,w#o;'S#{;'S;=`$d<%lO#{U>j[xQuSOt#{uw#{x}#{}!O,w!O!_#{!_!`-r!`#O#{#P#T#{#T#o,w#o;'S#{;'S;=`$d<%lO#{^?g[#WWuSOt#{uw#{x}#{}!O,w!O!_#{!_!`-r!`#O#{#P#T#{#T#o,w#o;'S#{;'S;=`$d<%lO#{^@d[#YWuSOt#{uw#{x}#{}!O,w!O!_#{!_!`-r!`#O#{#P#T#{#T#o,w#o;'S#{;'S;=`$d<%lO#{^Aa^#XWuSOt#{uw#{x}#{}!O,w!O!_#{!_!`-r!`#O#{#P#T#{#T#f,w#f#gB]#g#o,w#o;'S#{;'S;=`$d<%lO#{UBb^uSOt#{uw#{x}#{}!O,w!O!_#{!_!`-r!`#O#{#P#T#{#T#i,w#i#j=b#j#o,w#o;'S#{;'S;=`$d<%lO#{UCeU!bQuSOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{~C|O#b~",
   tokenizers: [operatorTokenizer, 1, 2, 3, tokenizer, new LocalTokenGroup("[~RP!O!PU~ZO!}~~", 11)],
-  topRules: {"Program":[0,26]},
+  topRules: {"Program":[0,27]},
   specialized: [{term: 20, get: (value: any, stack: any) => (specializeKeyword(value, stack) << 1), external: specializeKeyword},{term: 20, get: (value: keyof typeof spec_Identifier) => spec_Identifier[value] || -1}],
   tokenPrec: 1658
 })

src/parser/tests/strings.test.ts

@@ -131,27 +131,30 @@ describe('string escape sequences', () => {
 describe('curly strings', () => {
   test('work on one line', () => {
     expect('{ one two three }').toMatchTree(`
-      String  one two three 
+      String
+        CurlyString { one two three }
     `)
   })
 
   test('work on multiple lines', () => {
-    expect(`{ 
+    expect(`{
       one
       two
       three }`).toMatchTree(`
-    String  
+    String
+      CurlyString {
           one
           two
-          three `)
+          three }`)
   })
 
   test('can contain other curlies', () => {
     expect(`{ { one }
       two
       { three } }`).toMatchTree(`
-    String  { one }
+    String
+      CurlyString { { one }
           two
-          { three } `)
+          { three } }`)
   })
 })

src/parser/tokenizer.ts

@@ -1,5 +1,5 @@
 import { ExternalTokenizer, InputStream, Stack } from '@lezer/lr'
-import { Identifier, AssignableIdentifier, Word, IdentifierBeforeDot, Do, curlyString } from './shrimp.terms'
+import { Identifier, AssignableIdentifier, Word, IdentifierBeforeDot, Do, CurlyString } from './shrimp.terms'
 
 // doobie doobie do (we need the `do` keyword to know when we're defining params)
 export function specializeKeyword(ident: string) {
@@ -20,9 +20,7 @@ export const tokenizer = new ExternalTokenizer(
     const ch = getFullCodePoint(input, 0)
 
     // Handle curly strings
-    if (ch === 123) { // {
-      return consumeCurlyString(input, stack)
-    }
+    if (ch === 123 /* { */) return consumeCurlyString(input, stack)
 
     if (!isWordChar(ch)) return
 
@@ -32,7 +30,7 @@ export const tokenizer = new ExternalTokenizer(
     // 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
 
-    const isValidStart = isLowercaseLetter(ch) || isEmojiOrUnicode(ch)
+    const isValidStart = isIdentStart(ch)
     const canBeWord = stack.canShift(Word)
 
     // Consume all word characters, tracking if it remains a valid identifier
@@ -125,7 +123,7 @@ const consumeWordToken = (
     }
 
     // Track identifier validity: must be lowercase, digit, dash, or emoji/unicode
-    if (!isLowercaseLetter(ch) && !isDigit(ch) && ch !== 45 /* - */ && ch !== 63 /* ? */ && !isEmojiOrUnicode(ch)) {
+    if (!isIdentChar(ch)) {
       if (!canBeWord) break
       isValidIdentifier = false
     }
@@ -157,8 +155,9 @@ const consumeRestOfWord = (input: InputStream, startPos: number, canBeWord: bool
   return pos
 }
 
+// Consumes { curly strings } and tracks braces so you can { have { braces { inside { braces } } }
 const consumeCurlyString = (input: InputStream, stack: Stack) => {
-  if (!stack.canShift(curlyString)) return
+  if (!stack.canShift(CurlyString)) return
 
   let depth = 0
   let pos = 0
@@ -179,7 +178,7 @@ const consumeCurlyString = (input: InputStream, stack: Stack) => {
     pos++
   }
 
-  input.acceptToken(curlyString, pos)
+  input.acceptToken(CurlyString, pos)
 }
 
 // Check if this identifier is in scope (for property access detection)
@@ -239,6 +238,14 @@ const chooseIdentifierToken = (input: InputStream, stack: Stack): number => {
 }
 
 // Character classification helpers
+export const isIdentStart = (ch: number): boolean => {
+  return isLowercaseLetter(ch) || isEmojiOrUnicode(ch)
+}
+
+export const isIdentChar = (ch: number): boolean => {
+  return isLowercaseLetter(ch) || isDigit(ch) || ch === 45 /* - */ || ch === 63 /* ? */ || isEmojiOrUnicode(ch)
+}
+
 const isWhiteSpace = (ch: number): boolean => {
   return ch === 32 /* space */ || ch === 9 /* tab */ || ch === 13 /* \r */
 }