make defaults work, like magic

src/compiler/tests/compiler.test.ts

@@ -282,3 +282,19 @@ describe('dot get', () => {
     expect(`a = 1; arr = array 'a' 'b' 'c'; arr.(1 + a)`).toEvaluateTo('c', { array })
   })
 })
+
+describe('default params', () => {
+  test('parses 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('parses function with multiple default parameters', () => {
+    expect(`weird = do x='something' y=true: [x y] end; weird`).toEvaluateTo(['something', true])
+  })
+
+  test('parses 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)
+  })
+})

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
       )

src/parser/shrimp.grammar

@@ -175,7 +175,11 @@ ConditionalOp {
 }
 
 Params {
-  Identifier*
+  Identifier* NamedParam*
+}
+
+NamedParam {
+  NamedArgPrefix expressionWithoutIdentifier
 }
 
 Assign {

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,
+  colon = 45,
+  CatchExpr = 46,
+  keyword = 69,
+  TryBlock = 48,
+  FinallyExpr = 49,
+  Underscore = 52,
+  Array = 53,
+  Null = 54,
+  ConditionalOp = 55,
+  PositionalArg = 56,
+  TryExpr = 58,
+  Throw = 60,
+  IfExpr = 62,
+  SingleLineThenBlock = 64,
+  ThenBlock = 65,
+  ElseIfExpr = 66,
+  ElseExpr = 68,
+  CompoundAssign = 70,
+  Assign = 71

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,catch:94, finally:100, end:102, null:108, try:118, throw:122, if:126, elseif:134, else:138}
 export const parser = LRParser.deserialize({
   version: 14,
-  states: "9[QYQbOOO#tQcO'#C{O$qOSO'#C}O%PQbO'#EfOOQ`'#DW'#DWOOQa'#DT'#DTO&SQbO'#DbO'eQcO'#EZOOQa'#EZ'#EZO(hQcO'#EZO)jQcO'#EYO)}QRO'#C|O+ZQcO'#EUO+kQcO'#EUO+uQbO'#CzO,mOpO'#CxOOQ`'#EV'#EVO,rQbO'#EUO,yQQO'#ElOOQ`'#Dg'#DgO-OQbO'#DiO-OQbO'#EnOOQ`'#Dk'#DkO-sQRO'#DsOOQ`'#EU'#EUO.XQQO'#ETOOQ`'#ET'#ETOOQ`'#Du'#DuQYQbOOO.aQbO'#DUOOQa'#EY'#EYOOQ`'#De'#DeOOQ`'#Ek'#EkOOQ`'#D|'#D|O.kQbO,59cO/_QbO'#DPO/gQWO'#DQOOOO'#E]'#E]OOOO'#Dv'#DvO/{OSO,59iOOQa,59i,59iOOQ`'#Dx'#DxO0ZQbO'#DXO0cQQO,5;QOOQ`'#Dw'#DwO0hQbO,59|O0oQQO,59oOOQa,59|,59|O0zQbO,59|O1UQbO,5:`O-OQbO,59hO-OQbO,59hO-OQbO,59hO-OQbO,5:OO-OQbO,5:OO-OQbO,5:OO1fQRO,59fO1mQRO,59fO2OQRO,59fO1yQQO,59fO2ZQQO,59fO2cObO,59dO2nQbO'#D}O2yQbO,59bO3bQbO,5;WO3uQcO,5:TO4kQcO,5:TO4{QcO,5:TO5qQRO,5;YO5xQRO,5;YO1UQbO,5:_OOQ`,5:o,5:oOOQ`-E7s-E7sOOQ`,59p,59pOOQ`-E7z-E7zOOOO,59k,59kOOOO,59l,59lOOOO-E7t-E7tOOQa1G/T1G/TOOQ`-E7v-E7vO6TQbO1G0lOOQ`-E7u-E7uO6hQQO1G/ZOOQa1G/h1G/hO6sQbO1G/hOOQO'#Dz'#DzO6hQQO1G/ZOOQa1G/Z1G/ZOOQ`'#D{'#D{O6sQbO1G/hOOQ`1G/z1G/zOOQa1G/S1G/SO7lQcO1G/SO7vQcO1G/SO8QQcO1G/SOOQa1G/j1G/jO9pQcO1G/jO9wQcO1G/jO:OQcO1G/jOOQa1G/Q1G/QOOQa1G/O1G/OO!aQbO'#C{O:VQbO'#CwOOQ`,5:i,5:iOOQ`-E7{-E7{O:dQbO1G0rO:oQbO1G0sO;]QbO1G0tOOQ`1G/y1G/yO;pQbO7+&WO:oQbO7+&YO;{QQO7+$uOOQa7+$u7+$uO<WQbO7+%SOOQa7+%S7+%SOOQO-E7x-E7xOOQ`-E7y-E7yO<bQbO'#DZO<gQQO'#D^OOQ`7+&^7+&^O<lQbO7+&^O<qQbO7+&^OOQ`'#Dy'#DyO<yQQO'#DyO=OQbO'#EgOOQ`'#D]'#D]O=rQbO7+&_OOQ`'#Dm'#DmO=}QbO7+&`O>SQbO7+&aOOQ`<<Ir<<IrO>pQbO<<IrO>uQbO<<IrO>}QbO<<ItOOQa<<Ha<<HaOOQa<<Hn<<HnO?YQQO,59uO?_QbO,59xOOQ`<<Ix<<IxO?rQbO<<IxOOQ`,5:e,5:eOOQ`-E7w-E7wOOQ`<<Iy<<IyO?wQbO<<IyO?|QbO<<IyOOQ`<<Iz<<IzOOQ`'#Dn'#DnO@UQbO<<I{OOQ`AN?^AN?^O@aQbOAN?^OOQ`AN?`AN?`O@fQbOAN?`O@kQbOAN?`O@sQbO1G/aOAWQbO1G/dOOQ`1G/d1G/dOOQ`AN?dAN?dOOQ`AN?eAN?eOAnQbOAN?eO-OQbO'#DoOOQ`'#EO'#EOOAsQbOAN?gOBOQQO'#DqOOQ`AN?gAN?gOBTQbOAN?gOOQ`G24xG24xOOQ`G24zG24zOBYQbOG24zOB_QbO7+${OOQ`7+${7+${OOQ`7+%O7+%OOOQ`G25PG25POBxQRO,5:ZOCPQRO,5:ZOOQ`-E7|-E7|OOQ`G25RG25ROC[QbOG25ROCaQQO,5:]OOQ`LD*fLD*fOOQ`<<Hg<<HgOCfQQO1G/uOOQ`LD*mLD*mOAWQbO1G/wO>SQbO7+%aOOQ`7+%c7+%cOOQ`<<H{<<H{",
-  stateData: "Cn~O!uOS!vOS~OdPOegOfWOg_OhROmWOuWOvWO!VWO![bO!^dO!`eO!{^O#OQO#VTO#WUO#XjO~OdnOfWOg_OhROmWOuWOvWOymO!ToO!VWO!{^O#OQO#VTO#WUO!YoX#XoX#doX#^oX!OoX!RoX!SoX~OP!|XQ!|XR!|XS!|XT!|XU!|XW!|XX!|XY!|XZ!|X[!|X]!|X^!|X~P!aOruO#OxO#QsO#RtO~OdyO|{P~OdnOfWOg_OmWOuWOvWOymO!VWO!{^O#OQO#VTO#WUO#X|O~O#]!PO~P%XOP!}XQ!}XR!}XS!}XT!}XU!}XW!}XX!}XY!}XZ!}X[!}X]!}X^!}X#X!}X#d!}X!O!}X!R!}X!S!}X~OdnOfWOg_OhROmWOuWOvWOymO!ToO!VWO!{^O#OQO#VTO#WUO#^!}X~P&ZOV!RO~P&ZOP!|XQ!|XR!|XS!|XT!|XU!|XW!|XX!|XY!|XZ!|X[!|X]!|X^!|X~O#X!xX#d!xX!O!xX!R!xX!S!xX~P(oOP!TOQ!TOR!UOS!UOT!WOU!XOW!VOX!VOY!VOZ!VO[!VO]!VO^!SO~O#X!xX#d!xX!O!xX!R!xX!S!xX~OP!TOQ!TOR!UOS!UO~P*xOT!WOU!XO~P*xOdPOfWOg_OhROmWOuWOvWO!VWO!{^O#OQO#VTO#WUO~O!z!_O~O!Y!`O~P*xO|!bO~OdnOfWOg_OmWOuWOvWO!VWO!{^O#OQO#VTO#WUO~OV!RO_!hO`!hOa!hOb!hOc!hO~O#X!iO#d!iO~OhRO!T!kO~P-OOhROymO!ToO!Yka#Xka#dka#^ka!Oka!Rka!Ska~P-OOd!mO!{^O~O#O!nO#Q!nO#R!nO#S!nO#T!nO#U!nO~OruO#O!pO#QsO#RtO~OdyO|{X~O|!rO~O#]!uO~P%XOymO#X!wO#]!yO~O#X!zO#]!uO~P-OOegO![bO!^dO!`eO~P+uO#^#VO~P(oOP!TOQ!TOR!UOS!UO#^#VO~OT!WOU!XO#^#VO~O!Y!`O#^#VO~Od#WOm#WO!{^O~Od#XOg_O!{^O~O!Y!`O#Xja#dja#^ja!Oja!Rja!Sja~OegO![bO!^dO!`eO#X#^O~P+uO#X!]a#d!]a!O!]a!R!]a!S!]a~P)}O#X!]a#d!]a!O!]a!R!]a!S!]a~OP!TOQ!TOR!UOS!UO~P4YOT!WOU!XO~P4YOT!WOU!XOW!VOX!VOY!VOZ!VO[!VO]!VO~O|#_O~P5VOT!WOU!XO|#_O~OegO![bO!^dO!`eO#X#bO~P+uOymO#X!wO#]#dO~O#X!zO#]#fO~P-OO^!SORpiSpi#Xpi#dpi#^pi!Opi!Rpi!Spi~OPpiQpi~P6}OP!TOQ!TO~P6}OP!TOQ!TORpiSpi#Xpi#dpi#^pi!Opi!Rpi!Spi~OW!VOX!VOY!VOZ!VO[!VO]!VOT!Wi#X!Wi#d!Wi#^!Wi|!Wi!O!Wi!R!Wi!S!Wi~OU!XO~P8rOU!XO~P9UOU!Wi~P8rOhROymO!ToO~P-OO!O#iO!R#jO!S#kO~OegO![bO!^dO!`eO#X#nO!O#ZP!R#ZP!S#ZP~P+uOegO![bO!^dO!`eO#X#uO~P+uO!O#iO!R#jO!S#vO~OymO#X!wO#]#zO~O#X!zO#]#{O~P-OOd#|O~O|#}O~O!S$OO~O!R#jO!S$OO~O#X$QO~OegO![bO!^dO!`eO#X#nO!O#ZX!R#ZX!S#ZX!d#ZX!f#ZX~P+uO!O#iO!R#jO!S$SO~O!S$VO~OegO![bO!^dO!`eO#X#nO!S#ZP!d#ZP!f#ZP~P+uO!S$YO~O!R#jO!S$YO~O!O#iO!R#jO!S$[O~O|$_O~OegO![bO!^dO!`eO#X$`O~P+uO!S$bO~O!S$cO~O!R#jO!S$cO~O!S$iO!d$eO!f$hO~O!S$kO~O!S$lO~O!R#jO!S$lO~OegO![bO!^dO!`eO#X$nO~P+uOegO![bO!^dO!`eO#X#nO!S#ZP~P+uO!S$qO~O!S$uO!d$eO!f$hO~O|$wO~O!S$uO~O!S$xO~OegO![bO!^dO!`eO#X#nO!R#ZP!S#ZP~P+uO|$zO~P5VOT!WOU!XO|$zO~O!S${O~O#X$|O~O#X$}O~Omv~",
-  goto: "4k#dPPPPPPPPPPPPPPPPPPPPPPPPPP#e#{$bP%b#{&h'XP(S(SPP'X(WP(k)]P)`P)l)uPPP*_P+[,RP,YP,YP,YP,m,p,yP,}P,Y,Y-T-Z-a-g-m-y.T._.h.oPPPP.u.y/nPP0X1pP2oPPPPPPPP2s3_2sPP3l3s3s4W4WrhOl!R!b!h!r#^#_#b#p#u#}$_$`$n$|$}R!]^w`O^l!R!`!b!h!r#^#_#b#p#u#}$_$`$n$|$}tPO^l!R!b!h!r#^#_#b#p#u#}$_$`$n$|$}znPUVdemr}!Q!S!T!U!V!W!X!v!{#X#Y#e$eR#X!`tVO^l!R!b!h!r#^#_#b#p#u#}$_$`$n$|$}zWPUVdemr}!Q!S!T!U!V!W!X!v!{#X#Y#e$eQ!msQ#W!_R#Y!`r[Ol!R!b!h!r#^#_#b#p#u#}$_$`$n$|$}Q!Z^Q!ddQ!}!TR#Q!U!qWOPUV^delmr}!Q!R!S!T!U!V!W!X!b!h!r!v!{#X#Y#^#_#b#e#p#u#}$_$`$e$n$|$}TuQwYpPVr#X#YQ!OUQ!t}X!w!O!t!x#crhOl!R!b!h!r#^#_#b#p#u#}$_$`$n$|$}YoPVr#X#YQ!]^R!kmR{RQ#m#]Q#x#aQ$U#rR$^#yQ#r#^Q$p$`R$y$nQ#l#]Q#w#aQ$P#mQ$T#rQ$Z#xQ$]#yQ$d$UR$m$^|WPUV^demr}!Q!S!T!U!V!W!X!v!{#X#Y#e$esXOl!R!b!h!r#^#_#b#p#u#}$_$`$n$|$}r]Ol!R!b!h!r#^#_#b#p#u#}$_$`$n$|$}Q![^Q!edQ!geQ#R!XQ#T!WR$s$eZpPVr#X#YshOl!R!b!h!r#^#_#b#p#u#}$_$`$n$|$}R#t#_Q$X#uQ%O$|R%P$}T$f$X$gQ$j$XR$v$gQlOR!jlQwQR!owQ}UR!s}QzRR!qz^#p#^#b#u$`$n$|$}R$R#pQ!x!OQ#c!tT#g!x#cQ!{!QQ#e!vT#h!{#eWrPV#X#YR!lrS!aa!^R#[!aQ$g$XR$t$gTkOlSiOlQ!|!RQ#]!bQ#`!hQ#a!r`#o#^#b#p#u$`$n$|$}Q#s#_Q$a#}R$o$_raOl!R!b!h!r#^#_#b#p#u#}$_$`$n$|$}Q!^^R#Z!`tZO^l!R!b!h!r#^#_#b#p#u#}$_$`$n$|$}YoPVr#X#YQ!QUQ!cdQ!feQ!kmQ!v}W!z!Q!v!{#eQ!}!SQ#O!TQ#P!UQ#R!VQ#S!WQ#U!XR$r$erYOl!R!b!h!r#^#_#b#p#u#}$_$`$n$|$}znPUVdemr}!Q!S!T!U!V!W!X!v!{#X#Y#e$eR!Y^TvQw!RSOPV^lmr!R!b!h!r#X#Y#^#_#b#p#u#}$_$`$n$|$}U#q#^$`$nQ#y#bV$W#u$|$}ZqPVr#X#YscOl!R!b!h!r#^#_#b#p#u#}$_$`$n$|$}sfOl!R!b!h!r#^#_#b#p#u#}$_$`$n$|$}",
-  nodeNames: "⚠ Star Slash Plus Minus And Or Eq EqEq Neq Lt Lte Gt Gte Modulo PlusEq MinusEq StarEq SlashEq ModuloEq Identifier AssignableIdentifier Word IdentifierBeforeDot Do Program PipeExpr FunctionCall DotGet Number ParenExpr FunctionCallOrIdentifier 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 CompoundAssign Assign",
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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;=`$d<%lO#{U5X[rSOY5SYZ#{Zt5Stu1puw5Swx1px#O5S#O#P2Y#P#Q/^#Q;'S5S;'S;=`5}<%lO5SU6QP;=`<%l5SU6WP;=`<%l/^U6bUrS}QOt#{uw#{x#O#{#P;'S#{;'S;=`$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!UQOt#{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: 1634
 })

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`)
+  })
+})