Merge pull request 'Dollar Dot' (#49) from dollar-dot into main

Reviewed-on: #49

bin/repl

@@ -7,6 +7,9 @@ import * as readline from 'readline'
 import { readFileSync, writeFileSync } from 'fs'
 import { basename } from 'path'
 
+globals.$.script.name = '(repl)'
+globals.$.script.path = '(repl)'
+
 async function repl() {
   const commands = ['/clear', '/reset', '/vars', '/funcs', '/history', '/bytecode', '/exit', '/save', '/quit']
 

bin/shrimp

@@ -1,8 +1,9 @@
 #!/usr/bin/env bun
 
-import { colors } from '../src/prelude'
+import { colors, globals as prelude } from '../src/prelude'
 import { treeToString } from '../src/utils/tree'
 import { runCode, runFile, compileFile, parseCode } from '../src'
+import { resolve } from 'path'
 import { bytecodeToString } from 'reefvm'
 import { readFileSync } from 'fs'
 import { spawn } from 'child_process'
@@ -34,6 +35,9 @@ function showVersion() {
 }
 
 async function evalCode(code: string, imports: string[]) {
+  const idx = Bun.argv.indexOf('--')
+  prelude.$.args = idx >= 0 ? Bun.argv.slice(idx + 1) : []
+
   const importStatement = imports.length > 0 ? `import ${imports.join(' ')}` : ''
   if (importStatement) code = `${importStatement}; ${code}`
   return await runCode(code)
@@ -149,10 +153,12 @@ async function main() {
       console.log(`${colors.bright}usage: shrimp run <file>${colors.reset}`)
       process.exit(1)
     }
+    prelude.$.script.path = resolve(file)
     await runFile(file)
     return
   }
 
+  prelude.$.script.path = resolve(command)
   await runFile(command)
 }
 

src/compiler/compiler.ts

@@ -211,16 +211,37 @@ export class Compiler {
       }
 
       case terms.DotGet: {
+        // DotGet is parsed into a nested tree because it's hard to parse it into a flat one.
+        // However, we want a flat tree - so we're going to pretend like we are getting one from the parser.
+        //
+        //    This: DotGet(config, DotGet(script, name))
+        // Becomes: DotGet(config, script, name)
         const { objectName, property } = getDotGetParts(node, input)
         const instructions: ProgramItem[] = []
+
         instructions.push(['TRY_LOAD', objectName])
-        if (property.type.id === terms.ParenExpr) {
+
-          instructions.push(...this.#compileNode(property, input))
+        const flattenProperty = (prop: SyntaxNode): void => {
+          if (prop.type.id === terms.DotGet) {
+            const nestedParts = getDotGetParts(prop, input)
+
+            const nestedObjectValue = input.slice(nestedParts.object.from, nestedParts.object.to)
+            instructions.push(['PUSH', nestedObjectValue])
+            instructions.push(['DOT_GET'])
+
+            flattenProperty(nestedParts.property)
           } else {
-          const propertyValue = input.slice(property.from, property.to)
+            if (prop.type.id === terms.ParenExpr) {
+              instructions.push(...this.#compileNode(prop, input))
+            } else {
+              const propertyValue = input.slice(prop.from, prop.to)
               instructions.push(['PUSH', propertyValue])
             }
             instructions.push(['DOT_GET'])
+          }
+        }
+
+        flattenProperty(property)
         return instructions
       }
 

src/compiler/tests/compiler.test.ts

@@ -294,6 +294,43 @@ describe('dot get', () => {
   test('use parens expr with dot-get', () => {
     expect(`a = 1; arr = array 'a' 'b' 'c'; arr.(1 + a)`).toEvaluateTo('c', { array })
   })
+
+  test('chained dot get: two levels', () => {
+    expect(`obj = [inner=[value=42]]; obj.inner.value`).toEvaluateTo(42)
+  })
+
+  test('chained dot get: three levels', () => {
+    expect(`obj = [a=[b=[c=123]]]; obj.a.b.c`).toEvaluateTo(123)
+  })
+
+  test('chained dot get: four levels', () => {
+    expect(`obj = [w=[x=[y=[z='deep']]]]; obj.w.x.y.z`).toEvaluateTo('deep')
+  })
+
+  test('chained dot get with numeric index', () => {
+    expect(`obj = [items=[1 2 3]]; obj.items.0`).toEvaluateTo(1)
+  })
+
+  test('chained dot get in expression', () => {
+    expect(`config = [server=[port=3000]]; config.server.port + 1`).toEvaluateTo(3001)
+  })
+
+  test('chained dot get as function argument', () => {
+    const double = (x: number) => x * 2
+    expect(`obj = [val=[num=21]]; double obj.val.num`).toEvaluateTo(42, { double })
+  })
+
+  test('chained dot get in binary operation', () => {
+    expect(`a = [x=[y=10]]; b = [x=[y=20]]; a.x.y + b.x.y`).toEvaluateTo(30)
+  })
+
+  test('chained dot get with parens at end', () => {
+    expect(`idx = 1; obj = [items=[10 20 30]]; obj.items.(idx)`).toEvaluateTo(20)
+  })
+
+  test('mixed chained and simple dot get', () => {
+    expect(`obj = [a=1 b=[c=2]]; obj.a + obj.b.c`).toEvaluateTo(3)
+  })
 })
 
 describe('default params', () => {

src/compiler/utils.ts

@@ -293,7 +293,7 @@ export const getDotGetParts = (node: SyntaxNode, input: string) => {
     )
   }
 
-  if (object.type.id !== terms.IdentifierBeforeDot) {
+  if (object.type.id !== terms.IdentifierBeforeDot && object.type.id !== terms.Dollar) {
     throw new CompilerError(
       `DotGet object must be an IdentifierBeforeDot, got ${object.type.name}`,
       object.from,
@@ -301,9 +301,9 @@ export const getDotGetParts = (node: SyntaxNode, input: string) => {
     )
   }
 
-  if (![terms.Identifier, terms.Number, terms.ParenExpr].includes(property.type.id)) {
+  if (![terms.Identifier, terms.Number, terms.ParenExpr, terms.DotGet].includes(property.type.id)) {
     throw new CompilerError(
-      `DotGet property must be an Identifier or Number, got ${property.type.name}`,
+      `DotGet property must be an Identifier, Number, ParenExpr, or DotGet, got ${property.type.name}`,
       property.from,
       property.to
     )
@@ -311,7 +311,7 @@ export const getDotGetParts = (node: SyntaxNode, input: string) => {
 
   const objectName = input.slice(object.from, object.to)
 
-  return { objectName, property }
+  return { object, objectName, property }
 }
 
 export const getTryExprParts = (node: SyntaxNode, input: string) => {

src/index.ts

@@ -4,7 +4,7 @@ import { type Tree } from '@lezer/common'
 import { Compiler } from '#compiler/compiler'
 import { parser } from '#parser/shrimp'
 import { globals as parserGlobals, setGlobals as setParserGlobals } from '#parser/tokenizer'
-import { globals as shrimpGlobals } from '#prelude'
+import { globals as prelude } from '#prelude'
 
 export { Compiler } from '#compiler/compiler'
 export { parser } from '#parser/shrimp'
@@ -19,7 +19,7 @@ export class Shrimp {
 
     constructor(globals?: Record<string, any>) {
         const emptyBytecode = { instructions: [], constants: [], labels: new Map() }
-        this.vm = new VM(emptyBytecode, Object.assign({}, shrimpGlobals, globals ?? {}))
+        this.vm = new VM(emptyBytecode, Object.assign({}, prelude, globals ?? {}))
         this.globals = globals
     }
 
@@ -53,7 +53,7 @@ export class Shrimp {
         let bytecode
 
         if (typeof code === 'string') {
-            const compiler = new Compiler(code, Object.keys(Object.assign({}, shrimpGlobals, this.globals ?? {}, locals ?? {})))
+            const compiler = new Compiler(code, Object.keys(Object.assign({}, prelude, this.globals ?? {}, locals ?? {})))
             bytecode = compiler.bytecode
         } else {
             bytecode = code
@@ -79,7 +79,7 @@ export async function runCode(code: string, globals?: Record<string, any>): Prom
 }
 
 export async function runBytecode(bytecode: Bytecode, globals?: Record<string, any>): Promise<any> {
-    const vm = new VM(bytecode, Object.assign({}, shrimpGlobals, globals))
+    const vm = new VM(bytecode, Object.assign({}, prelude, globals))
     await vm.run()
     return vm.stack.length ? fromValue(vm.stack[vm.stack.length - 1]!, vm) : null
 }
@@ -90,7 +90,7 @@ export function compileFile(path: string, globals?: Record<string, any>): Byteco
 }
 
 export function compileCode(code: string, globals?: Record<string, any>): Bytecode {
-    const globalNames = [...Object.keys(shrimpGlobals), ...(globals ? Object.keys(globals) : [])]
+    const globalNames = [...Object.keys(prelude), ...(globals ? Object.keys(globals) : [])]
     const compiler = new Compiler(code, globalNames)
     return compiler.bytecode
 }
@@ -102,7 +102,7 @@ export function parseFile(path: string, globals?: Record<string, any>): Tree {
 
 export function parseCode(code: string, globals?: Record<string, any>): Tree {
     const oldGlobals = [...parserGlobals]
-    const globalNames = [...Object.keys(shrimpGlobals), ...(globals ? Object.keys(globals) : [])]
+    const globalNames = [...Object.keys(prelude), ...(globals ? Object.keys(globals) : [])]
 
     setParserGlobals(globalNames)
     const result = parser.parse(code)

src/parser/shrimp.grammar

@@ -29,6 +29,7 @@
   rightParen { ")" }
   colon[closedBy="end", @name="colon"] { ":" }
   Underscore { "_" }
+  Dollar { "$" }
   Regex { "//" (![/\\\n[] | "\\" ![\n] | "[" (![\n\\\]] | "\\" ![\n])* "]")+ ("//" $[gimsuy]*)? } // Stolen from the lezer JavaScript grammar
   "|"[@name=operator]
 }
@@ -239,7 +240,8 @@ expression {
 
 @skip {} {
   DotGet {
-    IdentifierBeforeDot dot (Number | Identifier | ParenExpr)
+    IdentifierBeforeDot dot (DotGet | Number | Identifier | ParenExpr) |
+    Dollar dot (DotGet | Number | Identifier | ParenExpr)
   }
 
   String { 
@@ -254,7 +256,7 @@ stringContent {
 }
 
 Interpolation {
-  "$" Identifier |
+  "$" FunctionCallOrIdentifier |
   "$" ParenExpr
 }
 

src/parser/shrimp.terms.ts

@@ -37,42 +37,43 @@ export const
   Program = 35,
   PipeExpr = 36,
   WhileExpr = 38,
-  keyword = 83,
+  keyword = 84,
   ConditionalOp = 40,
   ParenExpr = 41,
   FunctionCallWithNewlines = 42,
   DotGet = 43,
   Number = 44,
-  PositionalArg = 45,
+  Dollar = 45,
-  FunctionDef = 46,
+  PositionalArg = 46,
-  Params = 47,
+  FunctionDef = 47,
-  NamedParam = 48,
+  Params = 48,
-  NamedArgPrefix = 49,
+  NamedParam = 49,
-  String = 50,
+  NamedArgPrefix = 50,
-  StringFragment = 51,
+  String = 51,
-  Interpolation = 52,
+  StringFragment = 52,
-  EscapeSeq = 53,
+  Interpolation = 53,
-  DoubleQuote = 54,
+  FunctionCallOrIdentifier = 54,
-  Boolean = 55,
+  EscapeSeq = 55,
-  Null = 56,
+  DoubleQuote = 56,
-  colon = 57,
+  Boolean = 57,
-  CatchExpr = 58,
+  Null = 58,
-  Block = 60,
+  colon = 59,
-  FinallyExpr = 61,
+  CatchExpr = 60,
-  Underscore = 64,
+  Block = 62,
-  NamedArg = 65,
+  FinallyExpr = 63,
-  IfExpr = 66,
+  Underscore = 66,
-  FunctionCall = 68,
+  NamedArg = 67,
-  ElseIfExpr = 69,
+  IfExpr = 68,
-  ElseExpr = 71,
+  FunctionCall = 70,
-  FunctionCallOrIdentifier = 72,
+  ElseIfExpr = 71,
-  BinOp = 73,
+  ElseExpr = 73,
-  Regex = 74,
+  BinOp = 74,
-  Dict = 75,
+  Regex = 75,
-  Array = 76,
+  Dict = 76,
-  FunctionCallWithBlock = 77,
+  Array = 77,
-  TryExpr = 78,
+  FunctionCallWithBlock = 78,
-  Throw = 80,
+  TryExpr = 79,
-  Import = 82,
+  Throw = 81,
-  CompoundAssign = 84,
+  Import = 83,
-  Assign = 85
+  CompoundAssign = 85,
+  Assign = 86

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:78, null:112, catch:118, finally:124, end:126, if:134, else:140, try:158, throw:162, import:166}
+const spec_Identifier = {__proto__:null,while:78, null:116, catch:122, finally:128, end:130, if:138, else:144, try:160, throw:164, import:168}
 export const parser = LRParser.deserialize({
   version: 14,
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+  maxTerm: 125,
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   nodeProps: [
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   propSources: [highlighting],
   skippedNodes: [0,34],
   repeatNodeCount: 13,
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+  tokenData: "Ls~R!OOX$RXY$pYZ%ZZp$Rpq$pqr$Rrs%tst'ztu)cuw$Rwx)jxy)oyz*Yz{$R{|*s|}$R}!O*s!O!P$R!P!Q4`!Q!R+e!R![.Y![!]<{!]!^%Z!^!}$R!}#O=f#O#P?[#P#Q?a#Q#R$R#R#S?z#S#T$R#T#Y@e#Y#ZBP#Z#b@e#b#cGm#c#f@e#f#gHp#g#h@e#h#iIs#i#o@e#o#p$R#p#qLT#q;'S$R;'S;=`$j<%l~$R~O$R~~LnS$WU!USOt$Ruw$Rx#O$R#P;'S$R;'S;=`$j<%lO$RS$mP;=`<%l$R^$wU!US#YYOt$Ruw$Rx#O$R#P;'S$R;'S;=`$j<%lO$RU%bU!US#`QOt$Ruw$Rx#O$R#P;'S$R;'S;=`$j<%lO$RU%yZ!USOr%trs&lst%ttu'Vuw%twx'Vx#O%t#O#P'V#P;'S%t;'S;=`'t<%lO%tU&sU!YQ!USOt$Ruw$Rx#O$R#P;'S$R;'S;=`$j<%lO$RQ'YTOr'Vrs'is;'S'V;'S;=`'n<%lO'VQ'nO!YQQ'qP;=`<%l'VU'wP;=`<%l%t^(RZrY!USOY'zYZ$RZt'ztu(tuw'zwx(tx#O'z#O#P(t#P;'S'z;'S;=`)]<%lO'zY(ySrYOY(tZ;'S(t;'S;=`)V<%lO(tY)YP;=`<%l(t^)`P;=`<%l'z^)jO#e[}Q~)oO#c~U)vU!US#_QOt$Ruw$Rx#O$R#P;'S$R;'S;=`$j<%lO$RU*aU!US#mQOt$Ruw$Rx#O$R#P;'S$R;'S;=`$j<%lO$RU*xX!USOt$Ruw$Rx!Q$R!Q!R+e!R![.Y![#O$R#P;'S$R;'S;=`$j<%lO$RU+lb!US|QOt$Ruw$Rx!O$R!O!P,t!P!Q$R!Q![.Y![#O$R#P#R$R#R#S/V#S#U$R#U#V/t#V#c$R#c#d1Y#d#l$R#l#m2h#m;'S$R;'S;=`$j<%lO$RU,yW!USOt$Ruw$Rx!Q$R!Q![-c![#O$R#P;'S$R;'S;=`$j<%lO$RU-jY!US|QOt$Ruw$Rx!Q$R!Q![-c![#O$R#P#R$R#R#S,t#S;'S$R;'S;=`$j<%lO$RU.a[!US|QOt$Ruw$Rx!O$R!O!P,t!P!Q$R!Q![.Y![#O$R#P#R$R#R#S/V#S;'S$R;'S;=`$j<%lO$RU/[W!USOt$Ruw$Rx!Q$R!Q![.Y![#O$R#P;'S$R;'S;=`$j<%lO$RU/yX!USOt$Ruw$Rx!Q$R!Q!R0f!R!S0f!S#O$R#P;'S$R;'S;=`$j<%lO$RU0mX!US|QOt$Ruw$Rx!Q$R!Q!R0f!R!S0f!S#O$R#P;'S$R;'S;=`$j<%lO$RU1_W!USOt$Ruw$Rx!Q$R!Q!Y1w!Y#O$R#P;'S$R;'S;=`$j<%lO$RU2OW!US|QOt$Ruw$Rx!Q$R!Q!Y1w!Y#O$R#P;'S$R;'S;=`$j<%lO$RU2m[!USOt$Ruw$Rx!Q$R!Q![3c![!c$R!c!i3c!i#O$R#P#T$R#T#Z3c#Z;'S$R;'S;=`$j<%lO$RU3j[!US|QOt$Ruw$Rx!Q$R!Q![3c![!c$R!c!i3c!i#O$R#P#T$R#T#Z3c#Z;'S$R;'S;=`$j<%lO$RU4eW!USOt$Ruw$Rx!P$R!P!Q4}!Q#O$R#P;'S$R;'S;=`$j<%lO$RU5S^!USOY6OYZ$RZt6Otu7Ruw6Owx7Rx!P6O!P!Q$R!Q!}6O!}#O;t#O#P9a#P;'S6O;'S;=`<u<%lO6OU6V^!US!mQOY6OYZ$RZt6Otu7Ruw6Owx7Rx!P6O!P!Q9v!Q!}6O!}#O;t#O#P9a#P;'S6O;'S;=`<u<%lO6OQ7WX!mQOY7RZ!P7R!P!Q7s!Q!}7R!}#O8b#O#P9a#P;'S7R;'S;=`9p<%lO7RQ7vP!P!Q7yQ8OU!mQ#Z#[7y#]#^7y#a#b7y#g#h7y#i#j7y#m#n7yQ8eVOY8bZ#O8b#O#P8z#P#Q7R#Q;'S8b;'S;=`9Z<%lO8bQ8}SOY8bZ;'S8b;'S;=`9Z<%lO8bQ9^P;=`<%l8bQ9dSOY7RZ;'S7R;'S;=`9p<%lO7RQ9sP;=`<%l7RU9{W!USOt$Ruw$Rx!P$R!P!Q:e!Q#O$R#P;'S$R;'S;=`$j<%lO$RU:lb!US!mQOt$Ruw$Rx#O$R#P#Z$R#Z#[:e#[#]$R#]#^:e#^#a$R#a#b:e#b#g$R#g#h:e#h#i$R#i#j:e#j#m$R#m#n:e#n;'S$R;'S;=`$j<%lO$RU;y[!USOY;tYZ$RZt;ttu8buw;twx8bx#O;t#O#P8z#P#Q6O#Q;'S;t;'S;=`<o<%lO;tU<rP;=`<%l;tU<xP;=`<%l6OU=SU!US!]QOt$Ruw$Rx#O$R#P;'S$R;'S;=`$j<%lO$RU=mW#oQ!USOt$Ruw$Rx!_$R!_!`>V!`#O$R#P;'S$R;'S;=`$j<%lO$RU>[V!USOt$Ruw$Rx#O$R#P#Q>q#Q;'S$R;'S;=`$j<%lO$RU>xU#nQ!USOt$Ruw$Rx#O$R#P;'S$R;'S;=`$j<%lO$R~?aO#f~U?hU#pQ!USOt$Ruw$Rx#O$R#P;'S$R;'S;=`$j<%lO$RU@RU!US!dQOt$Ruw$Rx#O$R#P;'S$R;'S;=`$j<%lO$RU@j^!USOt$Ruw$Rx}$R}!O@e!O!Q$R!Q![@e![!_$R!_!`Af!`#O$R#P#T$R#T#o@e#o;'S$R;'S;=`$j<%lO$RUAmU!SQ!USOt$Ruw$Rx#O$R#P;'S$R;'S;=`$j<%lO$RUBU_!USOt$Ruw$Rx}$R}!O@e!O!Q$R!Q![@e![!_$R!_!`Af!`#O$R#P#T$R#T#UCT#U#o@e#o;'S$R;'S;=`$j<%lO$RUCY`!USOt$Ruw$Rx}$R}!O@e!O!Q$R!Q![@e![!_$R!_!`Af!`#O$R#P#T$R#T#`@e#`#aD[#a#o@e#o;'S$R;'S;=`$j<%lO$RUDa`!USOt$Ruw$Rx}$R}!O@e!O!Q$R!Q![@e![!_$R!_!`Af!`#O$R#P#T$R#T#g@e#g#hEc#h#o@e#o;'S$R;'S;=`$j<%lO$RUEh`!USOt$Ruw$Rx}$R}!O@e!O!Q$R!Q![@e![!_$R!_!`Af!`#O$R#P#T$R#T#X@e#X#YFj#Y#o@e#o;'S$R;'S;=`$j<%lO$RUFq^!ZQ!USOt$Ruw$Rx}$R}!O@e!O!Q$R!Q![@e![!_$R!_!`Af!`#O$R#P#T$R#T#o@e#o;'S$R;'S;=`$j<%lO$R^Gt^#gW!USOt$Ruw$Rx}$R}!O@e!O!Q$R!Q![@e![!_$R!_!`Af!`#O$R#P#T$R#T#o@e#o;'S$R;'S;=`$j<%lO$R^Hw^#iW!USOt$Ruw$Rx}$R}!O@e!O!Q$R!Q![@e![!_$R!_!`Af!`#O$R#P#T$R#T#o@e#o;'S$R;'S;=`$j<%lO$R^Iz`#hW!USOt$Ruw$Rx}$R}!O@e!O!Q$R!Q![@e![!_$R!_!`Af!`#O$R#P#T$R#T#f@e#f#gJ|#g#o@e#o;'S$R;'S;=`$j<%lO$RUKR`!USOt$Ruw$Rx}$R}!O@e!O!Q$R!Q![@e![!_$R!_!`Af!`#O$R#P#T$R#T#i@e#i#jEc#j#o@e#o;'S$R;'S;=`$j<%lO$RUL[UuQ!USOt$Ruw$Rx#O$R#P;'S$R;'S;=`$j<%lO$R~LsO#q~",
-  tokenizers: [operatorTokenizer, 1, 2, 3, tokenizer, new LocalTokenGroup("[~RP!O!PU~ZO#`~~", 11)],
+  tokenizers: [operatorTokenizer, 1, 2, 3, tokenizer, new LocalTokenGroup("[~RP!O!PU~ZO#a~~", 11)],
   topRules: {"Program":[0,35]},
   specialized: [{term: 28, get: (value: any, stack: any) => (specializeKeyword(value, stack) << 1), external: specializeKeyword},{term: 28, get: (value: keyof typeof spec_Identifier) => spec_Identifier[value] || -1}],
-  tokenPrec: 2370
+  tokenPrec: 2428
 })

src/parser/tests/dot-get.test.ts

@@ -298,4 +298,163 @@ end`).toMatchTree(`
               Number 2
     `)
   })
+
+  // NOTE: these are parsed as DotGet(meta, DotGet(script, name)) because that's easiest,
+  // but the compiler flattens them
+  test('chained dot get: meta.script.name', () => {
+    expect('meta = 42; meta.script.name').toMatchTree(`
+      Assign
+        AssignableIdentifier meta
+        Eq =
+        Number 42
+      FunctionCallOrIdentifier
+        DotGet
+          IdentifierBeforeDot meta
+          DotGet
+            IdentifierBeforeDot script
+            Identifier name
+    `)
+  })
+
+  test('chained dot get: a.b.c.d', () => {
+    expect('a = 1; a.b.c.d').toMatchTree(`
+      Assign
+        AssignableIdentifier a
+        Eq =
+        Number 1
+      FunctionCallOrIdentifier
+        DotGet
+          IdentifierBeforeDot a
+          DotGet
+            IdentifierBeforeDot b
+            DotGet
+              IdentifierBeforeDot c
+              Identifier d
+    `)
+  })
+
+  test('chained dot get in function call', () => {
+    expect('config = 1; echo config.db.host').toMatchTree(`
+      Assign
+        AssignableIdentifier config
+        Eq =
+        Number 1
+      FunctionCall
+        Identifier echo
+        PositionalArg
+          DotGet
+            IdentifierBeforeDot config
+            DotGet
+              IdentifierBeforeDot db
+              Identifier host
+    `)
+  })
+
+  test('chained dot get with numeric index at end', () => {
+    expect('obj = 1; obj.items.0').toMatchTree(`
+      Assign
+        AssignableIdentifier obj
+        Eq =
+        Number 1
+      FunctionCallOrIdentifier
+        DotGet
+          IdentifierBeforeDot obj
+          DotGet
+            IdentifierBeforeDot items
+            Number 0
+    `)
+  })
+
+  test('chained dot get with ParenExpr at end', () => {
+    expect('obj = 1; obj.items.(i)').toMatchTree(`
+      Assign
+        AssignableIdentifier obj
+        Eq =
+        Number 1
+      FunctionCallOrIdentifier
+        DotGet
+          IdentifierBeforeDot obj
+          DotGet
+            IdentifierBeforeDot items
+            ParenExpr
+              FunctionCallOrIdentifier
+                Identifier i
+    `)
+  })
+
+  test('not in scope remains Word with chained dots', () => {
+    expect('readme.md.bak').toMatchTree(`Word readme.md.bak`)
+  })
+
+  test('chained dot get in nested functions', () => {
+    expect(`do cfg:
+  do inner:
+    cfg.db.host
+  end
+end`).toMatchTree(`
+      FunctionDef
+        Do do
+        Params
+          Identifier cfg
+        colon :
+        FunctionDef
+          Do do
+          Params
+            Identifier inner
+          colon :
+          FunctionCallOrIdentifier
+            DotGet
+              IdentifierBeforeDot cfg
+              DotGet
+                IdentifierBeforeDot db
+                Identifier host
+          keyword end
+        keyword end
+    `)
+  })
+
+  test('mixed simple and chained dot get', () => {
+    expect('obj = 1; obj.a; obj.b.c').toMatchTree(`
+      Assign
+        AssignableIdentifier obj
+        Eq =
+        Number 1
+      FunctionCallOrIdentifier
+        DotGet
+          IdentifierBeforeDot obj
+          Identifier a
+      FunctionCallOrIdentifier
+        DotGet
+          IdentifierBeforeDot obj
+          DotGet
+            IdentifierBeforeDot b
+            Identifier c
+    `)
+  })
+
+  test.skip('chained numeric dot get: row.2.1.b', () => {
+    expect('row = []; row.2.1').toMatchTree(`
+      Assign
+        AssignableIdentifier row
+        Eq =
+        Array []
+      FunctionCallOrIdentifier
+        DotGet
+          IdentifierBeforeDot row
+          DotGet
+            Number 2
+            DotGet
+              Number 1
+              Identifier b
+    `)
+
+    test('parses $.pid just fine', () => {
+      expect(`$.pid`).toMatchTree(`
+      FunctionCallOrIdentifier
+        DotGet
+          Dollar $
+          Identifier pid
+  `)
+    })
+  })
 })

src/parser/tests/strings.test.ts

@@ -8,6 +8,7 @@ describe('string interpolation', () => {
       String
         StringFragment ${'hello '}
         Interpolation
+          FunctionCallOrIdentifier
             Identifier name
     `)
   })
@@ -44,6 +45,7 @@ describe('string interpolation', () => {
       String
         StringFragment x/
         Interpolation
+          FunctionCallOrIdentifier
             Identifier y
         StringFragment /z
     `)
@@ -122,6 +124,7 @@ describe('string escape sequences', () => {
       String
         StringFragment value: 
         Interpolation
+          FunctionCallOrIdentifier
             Identifier x
         EscapeSeq \\n
     `)

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, DotGet } from './shrimp.terms'
 
 // doobie doobie do (we need the `do` keyword to know when we're defining params)
 export function specializeKeyword(ident: string) {
@@ -187,11 +187,21 @@ const checkForDotGet = (input: InputStream, stack: Stack, pos: number): number |
   const identifierText = buildIdentifierText(input, pos)
   const context = stack.context as { scope: { has(name: string): boolean } } | undefined
 
-  // If identifier is in scope, this is property access (e.g., obj.prop)
+  // Check if identifier is in scope (lexical scope or globals)
-  // If not in scope, it should be consumed as a Word (e.g., file.txt)
+  const inScope = context?.scope.has(identifierText) || globals.includes(identifierText)
-  return context?.scope.has(identifierText) || globals.includes(identifierText)
+
-    ? IdentifierBeforeDot
+  // property access
-    : null
+  if (inScope) return IdentifierBeforeDot
+
+  // Not in scope - check if we're inside a DotGet chain
+  // Inside the @skip {} block where DotGet is defined, Word cannot be shifted
+  // but Identifier can be. This tells us we're at the RHS of a DotGet.
+  const canShiftIdentifier = stack.canShift(Identifier)
+  const canShiftWord = stack.canShift(Word)
+  const inDotGetChain = canShiftIdentifier && !canShiftWord
+
+  // continue if we're inside a DotGet
+  return inDotGetChain ? IdentifierBeforeDot : null
 }
 
 // Decide between AssignableIdentifier and Identifier using grammar state + peek-ahead

src/prelude/index.ts

@@ -1,5 +1,6 @@
 // The prelude creates all the builtin Shrimp functions.
 
+import { join, resolve } from 'path'
 import {
   type Value, type VM, toValue,
   extractParamInfo, isWrapped, getOriginalFunction,
@@ -22,6 +23,20 @@ export const globals = {
   math,
   str,
 
+  // shrimp runtime info
+  $: {
+    args: Bun.argv.slice(3),
+    argv: Bun.argv.slice(1),
+    env: process.env,
+    pid: process.pid,
+    cwd: process.env.PWD,
+    script: {
+      name: Bun.argv[2] || '(shrimp)',
+      path: resolve(join('.', Bun.argv[2] ?? ''))
+    },
+
+  },
+
   // hello
   echo: (...args: any[]) => {
     console.log(...args.map(a => {
@@ -66,7 +81,6 @@ export const globals = {
   },
 
   // env
-  args: Bun.argv.slice(1),
   exit: (num: number) => process.exit(num ?? 0),
 
   // type predicates

src/prelude/tests/info.test.ts

@@ -80,15 +80,15 @@ describe('introspection', () => {
 
 describe('environment', () => {
   test('args is an array', async () => {
-    await expect(`array? args`).toEvaluateTo(true, globals)
+    await expect(`array? $.args`).toEvaluateTo(true, globals)
   })
 
   test('args can be accessed', async () => {
-    await expect(`type args`).toEvaluateTo('array', globals)
+    await expect(`type $.args`).toEvaluateTo('array', globals)
   })
 
-  test('', async () => {
+  test('argv includes more than just the args', async () => {
-    await expect(`list.first args | str.ends-with? 'shrimp.test.ts'`).toEvaluateTo(true)
+    await expect(`list.first $.argv | str.ends-with? 'shrimp.test.ts'`).toEvaluateTo(true)
   })
 })
 
@@ -103,3 +103,38 @@ describe('ref', () => {
   expect(`rnd = ref math.random; rnd | type`).toEvaluateTo('number')
   expect(`rnd = ref math.random; ref rnd | type`).toEvaluateTo('native')
 })
+
+describe('$ global dictionary', () => {
+  test('$.args is an array', async () => {
+    await expect(`$.args | array?`).toEvaluateTo(true, globals)
+  })
+
+  test('$.args can be accessed', async () => {
+    await expect(`$.args | type`).toEvaluateTo('array', globals)
+  })
+
+  test('$.script.name is a string', async () => {
+    await expect(`$.script.name | string?`).toEvaluateTo(true, globals)
+  })
+
+  test('$.script.path is a string', async () => {
+    await expect(`$.script.path | string?`).toEvaluateTo(true, globals)
+  })
+
+  test('$.env is a dict', async () => {
+    await expect(`$.env | dict?`).toEvaluateTo(true, globals)
+  })
+
+  test('$.pid is a number', async () => {
+    await expect(`$.pid | number?`).toEvaluateTo(true, globals)
+    await expect(`$.pid > 0`).toEvaluateTo(true, globals)
+  })
+
+  test('$.cwd is a string', async () => {
+    await expect(`$.cwd | string?`).toEvaluateTo(true, globals)
+  })
+
+  test('$.cwd returns current working directory', async () => {
+    await expect(`$.cwd`).toEvaluateTo(process.cwd(), globals)
+  })
+})