Merge pull request 'Add default param values' (#18 ) from defaults into main

Reviewed-on: #18 Reviewed-by: probablycorey <probablycorey@gmail.com>
only constant values can be defaults
2025-11-03 16:54:43 +00:00 · 2025-11-02 16:52:20 -08:00 · 2025-11-02 16:34:59 -08:00 · 2025-11-02 14:04:32 -08:00
6 changed files with 121 additions and 33 deletions
--- a/src/compiler/tests/compiler.test.ts
+++ b/src/compiler/tests/compiler.test.ts
@ -282,3 +282,31 @@ describe('dot get', () => {
    expect(`a = 1; arr = array 'a' 'b' 'c'; arr.(1 + a)`).toEvaluateTo('c', { array })
  })
 })
+
+describe('default params', () => {
+  test('function with single default parameter', () => {
+    expect('add1 = do x=1: x + 1 end; add1').toEvaluateTo(2)
+    expect('add1 = do x=1: x + 1 end; add1 5').toEvaluateTo(6)
+  })
+
+  test('function with multiple default parameters', () => {
+    expect(`weird = do x='something' y=true: [x y] end; weird`).toEvaluateTo(['something', true])
+  })
+
+  test('function with mixed parameters', () => {
+    expect('multiply = do x y=5: x * y end; multiply 5').toEvaluateTo(25)
+    expect('multiply = do x y=5: x * y end; multiply 5 2').toEvaluateTo(10)
+  })
+
+  test.skip('array default', () => {
+    expect('abc = do alpha=[a b c]: alpha end; abc').toEvaluateTo(['a', 'b', 'c'])
+    expect('abc = do alpha=[a b c]: alpha end; abc [x y z]').toEvaluateTo(['x', 'y', 'z'])
+  })
+
+  test.skip('dict default', () => {
+    expect('make-person = do person=[name=Bob age=60]: person end; make-person')
+      .toEvaluateTo({ name: 'Bob', age: 60 })
+    expect('make-person = do person=[name=Bob age=60]: person end; make-person [name=Jon age=21]')
+      .toEvaluateTo({ name: 'Jon', age: 21 })
+  })
+})
--- a/src/compiler/utils.ts
+++ b/src/compiler/utils.ts
@ -99,9 +99,9 @@ export const getFunctionDefParts = (node: SyntaxNode, input: string) => {
  }

  const paramNames = getAllChildren(paramsNode).map((param) => {
-    if (param.type.id !== terms.Identifier) {
+    if (param.type.id !== terms.Identifier && param.type.id !== terms.NamedParam) {
      throw new CompilerError(
-        `FunctionDef params must be Identifier, got ${param.type.name}`,
+        `FunctionDef params must be Identifier or NamedParam, got ${param.type.name}`,
        param.from,
        param.to
      )
--- a/src/parser/shrimp.grammar
+++ b/src/parser/shrimp.grammar
@ -175,7 +175,11 @@ ConditionalOp {
 }

 Params {
-  Identifier*
+  Identifier* NamedParam*
+}
+
+NamedParam {
+  NamedArgPrefix (String | Number | Boolean | @specialize[@name=Null]<Identifier, "null">)
 }

 Assign {
--- a/src/parser/shrimp.terms.ts
+++ b/src/parser/shrimp.terms.ts
@ -43,22 +43,23 @@ export const
  NamedArgPrefix = 41,
  FunctionDef = 42,
  Params = 43,
-  colon = 44,
-  CatchExpr = 45,
-  keyword = 68,
-  TryBlock = 47,
-  FinallyExpr = 48,
-  Underscore = 51,
-  Array = 52,
-  Null = 53,
-  ConditionalOp = 54,
-  PositionalArg = 55,
-  TryExpr = 57,
-  Throw = 59,
-  IfExpr = 61,
-  SingleLineThenBlock = 63,
-  ThenBlock = 64,
-  ElseIfExpr = 65,
-  ElseExpr = 67,
-  CompoundAssign = 69,
-  Assign = 70
+  NamedParam = 44,
+  Null = 45,
+  colon = 46,
+  CatchExpr = 47,
+  keyword = 69,
+  TryBlock = 49,
+  FinallyExpr = 50,
+  Underscore = 53,
+  Array = 54,
+  ConditionalOp = 55,
+  PositionalArg = 56,
+  TryExpr = 58,
+  Throw = 60,
+  IfExpr = 62,
+  SingleLineThenBlock = 64,
+  ThenBlock = 65,
+  ElseIfExpr = 66,
+  ElseExpr = 68,
+  CompoundAssign = 70,
+  Assign = 71
--- 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 "./scopeTracker"
 import {highlighting} from "./highlight"
-const spec_Identifier = {__proto__:null,catch:92, finally:98, end:100, null:106, try:116, throw:120, if:124, elseif:132, else:136}
+const spec_Identifier = {__proto__:null,null:90, catch:96, finally:102, end:104, try:118, throw:122, if:126, elseif:134, else:138}
 export const parser = LRParser.deserialize({
  version: 14,
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+  repeatNodeCount: 11,
+  tokenData: "C_~R|OX#{XY$jYZ%TZp#{pq$jqs#{st%ntu'Vuw#{wx'[xy'ayz'zz{#{{|(e|}#{}!O+X!O!P#{!P!Q-n!Q![)S![!]6Z!]!^%T!^!}#{!}#O6t#O#P8j#P#Q8o#Q#R#{#R#S9Y#S#T#{#T#Y,Y#Y#Z9s#Z#b,Y#b#c>q#c#f,Y#f#g?n#g#h,Y#h#i@k#i#o,Y#o#p#{#p#qBo#q;'S#{;'S;=`$d<%l~#{~O#{~~CYS$QUrSOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{S$gP;=`<%l#{^$qUrS!wYOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{U%[UrS#ZQOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{^%uZrS!xYOY%nYZ#{Zt%ntu&huw%nwx&hx#O%n#O#P&h#P;'S%n;'S;=`'P<%lO%nY&mS!xYOY&hZ;'S&h;'S;=`&y<%lO&hY&|P;=`<%l&h^'SP;=`<%l%n~'[O#S~~'aO#Q~U'hUrS!}QOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{U(RUrS#`QOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{U(jWrSOt#{uw#{x!Q#{!Q![)S![#O#{#P;'S#{;'S;=`$d<%lO#{U)ZYrSmQOt#{uw#{x!O#{!O!P)y!P!Q#{!Q![)S![#O#{#P;'S#{;'S;=`$d<%lO#{U*OWrSOt#{uw#{x!Q#{!Q![*h![#O#{#P;'S#{;'S;=`$d<%lO#{U*oWrSmQOt#{uw#{x!Q#{!Q![*h![#O#{#P;'S#{;'S;=`$d<%lO#{U+^^rSOt#{uw#{x}#{}!O,Y!O!Q#{!Q![)S![!_#{!_!`-T!`#O#{#P#T#{#T#o,Y#o;'S#{;'S;=`$d<%lO#{U,_[rSOt#{uw#{x}#{}!O,Y!O!_#{!_!`-T!`#O#{#P#T#{#T#o,Y#o;'S#{;'S;=`$d<%lO#{U-[UyQrSOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{U-sWrSOt#{uw#{x!P#{!P!Q.]!Q#O#{#P;'S#{;'S;=`$d<%lO#{U.b^rSOY/^YZ#{Zt/^tu0auw/^wx0ax!P/^!P!Q#{!Q!}/^!}#O5S#O#P2o#P;'S/^;'S;=`6T<%lO/^U/e^rSvQOY/^YZ#{Zt/^tu0auw/^wx0ax!P/^!P!Q3U!Q!}/^!}#O5S#O#P2o#P;'S/^;'S;=`6T<%lO/^Q0fXvQOY0aZ!P0a!P!Q1R!Q!}0a!}#O1p#O#P2o#P;'S0a;'S;=`3O<%lO0aQ1UP!P!Q1XQ1^UvQ#Z#[1X#]#^1X#a#b1X#g#h1X#i#j1X#m#n1XQ1sVOY1pZ#O1p#O#P2Y#P#Q0a#Q;'S1p;'S;=`2i<%lO1pQ2]SOY1pZ;'S1p;'S;=`2i<%lO1pQ2lP;=`<%l1pQ2rSOY0aZ;'S0a;'S;=`3O<%lO0aQ3RP;=`<%l0aU3ZWrSOt#{uw#{x!P#{!P!Q3s!Q#O#{#P;'S#{;'S;=`$d<%lO#{U3zbrSvQOt#{uw#{x#O#{#P#Z#{#Z#[3s#[#]#{#]#^3s#^#a#{#a#b3s#b#g#{#g#h3s#h#i#{#i#j3s#j#m#{#m#n3s#n;'S#{;'S;=`$d<%lO#{U5X[rSOY5SYZ#{Zt5Stu1puw5Swx1px#O5S#O#P2Y#P#Q/^#Q;'S5S;'S;=`5}<%lO5SU6QP;=`<%l5SU6WP;=`<%l/^U6bUrS!OQOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{U6{W#YQrSOt#{uw#{x!_#{!_!`7e!`#O#{#P;'S#{;'S;=`$d<%lO#{U7jVrSOt#{uw#{x#O#{#P#Q8P#Q;'S#{;'S;=`$d<%lO#{U8WU#XQrSOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{~8oO#T~U8vU#_QrSOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{U9aUrS!VQOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{U9x]rSOt#{uw#{x}#{}!O,Y!O!_#{!_!`-T!`#O#{#P#T#{#T#U:q#U#o,Y#o;'S#{;'S;=`$d<%lO#{U:v^rSOt#{uw#{x}#{}!O,Y!O!_#{!_!`-T!`#O#{#P#T#{#T#`,Y#`#a;r#a#o,Y#o;'S#{;'S;=`$d<%lO#{U;w^rSOt#{uw#{x}#{}!O,Y!O!_#{!_!`-T!`#O#{#P#T#{#T#g,Y#g#h<s#h#o,Y#o;'S#{;'S;=`$d<%lO#{U<x^rSOt#{uw#{x}#{}!O,Y!O!_#{!_!`-T!`#O#{#P#T#{#T#X,Y#X#Y=t#Y#o,Y#o;'S#{;'S;=`$d<%lO#{U={[uQrSOt#{uw#{x}#{}!O,Y!O!_#{!_!`-T!`#O#{#P#T#{#T#o,Y#o;'S#{;'S;=`$d<%lO#{^>x[#UWrSOt#{uw#{x}#{}!O,Y!O!_#{!_!`-T!`#O#{#P#T#{#T#o,Y#o;'S#{;'S;=`$d<%lO#{^?u[#WWrSOt#{uw#{x}#{}!O,Y!O!_#{!_!`-T!`#O#{#P#T#{#T#o,Y#o;'S#{;'S;=`$d<%lO#{^@r^#VWrSOt#{uw#{x}#{}!O,Y!O!_#{!_!`-T!`#O#{#P#T#{#T#f,Y#f#gAn#g#o,Y#o;'S#{;'S;=`$d<%lO#{UAs^rSOt#{uw#{x}#{}!O,Y!O!_#{!_!`-T!`#O#{#P#T#{#T#i,Y#i#j<s#j#o,Y#o;'S#{;'S;=`$d<%lO#{UBvU!ZQrSOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{~C_O#f~",
+  tokenizers: [operatorTokenizer, 1, 2, 3, tokenizer, new LocalTokenGroup("[~RP!O!PU~ZO!|~~", 11)],
  topRules: {"Program":[0,25]},
  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: 1591
+  tokenPrec: 1619
 })
--- a/src/parser/tests/functions.test.ts
+++ b/src/parser/tests/functions.test.ts
@ -177,3 +177,58 @@ end`).toMatchTree(`
    `)
  })
 })
+
+describe('default params', () => {
+  test('parses function with single default parameter', () => {
+    expect('do x=1: x + 1 end').toMatchTree(`
+      FunctionDef
+        Do do
+        Params
+          NamedParam
+            NamedArgPrefix x=
+            Number 1
+        colon :
+        BinOp
+          Identifier x
+          Plus +
+          Number 1
+        keyword end`)
+  })
+
+  test('parses function with multiple default parameters', () => {
+    expect(`do x='something' y=true: x * y end`).toMatchTree(`
+      FunctionDef
+        Do do
+        Params
+          NamedParam
+            NamedArgPrefix x=
+            String
+              StringFragment something
+          NamedParam
+            NamedArgPrefix y=
+            Boolean true
+        colon :
+        BinOp
+          Identifier x
+          Star *
+          Identifier y
+        keyword end`)
+  })
+
+  test('parses function with mixed parameters', () => {
+    expect('do x y=true: x * y end').toMatchTree(`
+      FunctionDef
+        Do do
+        Params
+          Identifier x
+          NamedParam
+            NamedArgPrefix y=
+            Boolean true
+        colon :
+        BinOp
+          Identifier x
+          Star *
+          Identifier y
+        keyword end`)
+  })
+})
Author	SHA1	Message	Date
probablycorey	fec4b626df	Merge pull request 'Add default param values' (#18 ) from defaults into main Reviewed-on: #18 Reviewed-by: probablycorey <probablycorey@gmail.com>	2025-11-03 16:54:43 +00:00
Chris Wanstrath	fa034d4bd4	only constant values can be defaults	2025-11-02 16:52:20 -08:00
Chris Wanstrath	8addb77e90	make defaults work, like magic	2025-11-02 16:34:59 -08:00
Chris Wanstrath	1791e5a6c7	parse defaults	2025-11-02 14:04:32 -08:00