Refactor node-specific flags to overlap with numeric flags (#570)

This change moves node-specific flags (TRIPLE_STRING_FLAG, PARENS_FLAG, etc.)
from bits 5-6 to overlap with numeric flags in bits 8-15. This is safe because:

1. Node types that use specific flags never use numeric flags
2. Numeric flags are only used by ncat/nrow nodes, which don't use node-specific flags
3. The parser now passes dimensions separately to avoid flag conflicts

Key changes:
- Moved most node-specific flags to bit 8, some to bit 9
- Refactored parse_cat/parse_array to return dimension as a separate value
- Updated emit_braces to accept dimension parameter
- Made untokenize function head-aware for proper flag display
- Simplified flag handling by removing conditionals (just OR flags together)
- Added tests for dimension 4 ncat to ensure higher dimensions work correctly

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-authored-by: Keno Fischer <Keno@users.noreply.github.com>
Co-authored-by: Claude <noreply@anthropic.com>

Author: Keno

src/julia/julia_parse_stream.jl

@@ -9,54 +9,54 @@ const INFIX_FLAG       = RawFlags(1<<3)
 const PREFIX_OP_FLAG   = RawFlags(2<<3)
 const POSTFIX_OP_FLAG  = RawFlags(3<<3)
 
-# The following flags are quite head-specific and may overlap
+# The following flags are quite head-specific and may overlap with numeric flags
 
 """
 Set when K"string" or K"cmdstring" was triple-delimited as with \"\"\" or ```
 """
-const TRIPLE_STRING_FLAG = RawFlags(1<<5)
+const TRIPLE_STRING_FLAG = RawFlags(1<<8)
 
 """
 Set when a K"string", K"cmdstring" or K"Identifier" needs raw string unescaping
 """
-const RAW_STRING_FLAG = RawFlags(1<<6)
+const RAW_STRING_FLAG = RawFlags(1<<9)
 
 """
 Set for K"tuple", K"block" or K"macrocall" which are delimited by parentheses
 """
-const PARENS_FLAG = RawFlags(1<<5)
+const PARENS_FLAG = RawFlags(1<<8)
 
 """
 Set for various delimited constructs when they contains a trailing comma. For
 example, to distinguish `(a,b,)` vs `(a,b)`, and `f(a)` vs `f(a,)`. Kinds where
 this applies are: `tuple call dotcall macrocall vect curly braces <: >:`.
 """
-const TRAILING_COMMA_FLAG = RawFlags(1<<6)
+const TRAILING_COMMA_FLAG = RawFlags(1<<9)
 
 """
 Set for K"quote" for the short form `:x` as opposed to long form `quote x end`
 """
-const COLON_QUOTE = RawFlags(1<<5)
+const COLON_QUOTE = RawFlags(1<<8)
 
 """
 Set for K"toplevel" which is delimited by parentheses
 """
-const TOPLEVEL_SEMICOLONS_FLAG = RawFlags(1<<5)
+const TOPLEVEL_SEMICOLONS_FLAG = RawFlags(1<<8)
 
 """
 Set for K"function" in short form definitions such as `f() = 1`
 """
-const SHORT_FORM_FUNCTION_FLAG = RawFlags(1<<5)
+const SHORT_FORM_FUNCTION_FLAG = RawFlags(1<<8)
 
 """
 Set for K"struct" when mutable
 """
-const MUTABLE_FLAG = RawFlags(1<<5)
+const MUTABLE_FLAG = RawFlags(1<<8)
 
 """
 Set for K"module" when it's not bare (`module`, not `baremodule`)
 """
-const BARE_MODULE_FLAG = RawFlags(1<<5)
+const BARE_MODULE_FLAG = RawFlags(1<<8)
 
 # Flags holding the dimension of an nrow or other UInt8 not held in the source
 # TODO: Given this is only used for nrow/ncat, we could actually use all the flags?
@@ -137,29 +137,34 @@ function untokenize(head::SyntaxHead; unique=true, include_flag_suff=true)
         is_postfix_op_call(head) && (str = str*"-post")
 
         k = kind(head)
-        if k in KSet"string cmdstring Identifier"
-            has_flags(head, TRIPLE_STRING_FLAG) && (str = str*"-s")
-            has_flags(head, RAW_STRING_FLAG) && (str = str*"-r")
-        elseif k in KSet"tuple block macrocall"
-            has_flags(head, PARENS_FLAG) && (str = str*"-p")
-        elseif k == K"quote"
-            has_flags(head, COLON_QUOTE) && (str = str*"-:")
-        elseif k == K"toplevel"
-            has_flags(head, TOPLEVEL_SEMICOLONS_FLAG) && (str = str*"-;")
-        elseif k == K"function"
-            has_flags(head, SHORT_FORM_FUNCTION_FLAG) && (str = str*"-=")
-        elseif k == K"struct"
-            has_flags(head, MUTABLE_FLAG) && (str = str*"-mut")
-        elseif k == K"module"
-            has_flags(head, BARE_MODULE_FLAG) && (str = str*"-bare")
-        end
-        if k in KSet"tuple call dotcall macrocall vect curly braces <: >:" &&
-                has_flags(head, TRAILING_COMMA_FLAG)
-            str *= "-,"
+        # Handle numeric flags for nrow/ncat nodes
+        if k in KSet"nrow ncat typed_ncat"
+            n = numeric_flags(head)
+            n != 0 && (str = str*"-"*string(n))
+        else
+            # Handle head-specific flags that overlap with numeric flags
+            if k in KSet"string cmdstring Identifier"
+                has_flags(head, TRIPLE_STRING_FLAG) && (str = str*"-s")
+                has_flags(head, RAW_STRING_FLAG) && (str = str*"-r")
+            elseif k in KSet"tuple block macrocall"
+                has_flags(head, PARENS_FLAG) && (str = str*"-p")
+            elseif k == K"quote"
+                has_flags(head, COLON_QUOTE) && (str = str*"-:")
+            elseif k == K"toplevel"
+                has_flags(head, TOPLEVEL_SEMICOLONS_FLAG) && (str = str*"-;")
+            elseif k == K"function"
+                has_flags(head, SHORT_FORM_FUNCTION_FLAG) && (str = str*"-=")
+            elseif k == K"struct"
+                has_flags(head, MUTABLE_FLAG) && (str = str*"-mut")
+            elseif k == K"module"
+                has_flags(head, BARE_MODULE_FLAG) && (str = str*"-bare")
+            end
+            if k in KSet"tuple call dotcall macrocall vect curly braces <: >:" &&
+                    has_flags(head, TRAILING_COMMA_FLAG)
+                str *= "-,"
+            end
         end
         is_suffixed(head) && (str = str*"-suf")
-        n = numeric_flags(head)
-        n != 0 && (str = str*"-"*string(n))
     end
     str
 end

src/julia/parser.jl

@@ -1098,8 +1098,8 @@ function parse_where_chain(ps0::ParseState, mark)
             # x where {y for y in ys}  ==>  (where x (braces (generator y (iteration (in y ys)))))
             m = position(ps)
             bump(ps, TRIVIA_FLAG)
-            ckind, cflags = parse_cat(ps, K"}", ps.end_symbol)
-            emit_braces(ps, m, ckind, cflags)
+            ckind, cflags, dim = parse_cat(ps, K"}", ps.end_symbol)
+            emit_braces(ps, m, ckind, cflags, dim)
             emit(ps, mark, K"where")
         else
             # x where T     ==>  (where x T)
@@ -1589,7 +1589,7 @@ function parse_call_chain(ps::ParseState, mark, is_macrocall=false)
             # a [i]  ==>  (ref a (error-t) i)
             bump_disallowed_space(ps)
             bump(ps, TRIVIA_FLAG)
-            ckind, cflags = parse_cat(ParseState(ps, end_symbol=true),
+            ckind, cflags, dim = parse_cat(ParseState(ps, end_symbol=true),
                                       K"]", ps.end_symbol)
             if is_macrocall
                 # @S[a,b]  ==>  (macrocall @S (vect a b))
@@ -1600,7 +1600,7 @@ function parse_call_chain(ps::ParseState, mark, is_macrocall=false)
                 #v1.7: @S[a ;; b]  ==>  (macrocall @S (ncat-2 a b))
                 #v1.6: @S[a ;; b]  ==>  (macrocall @S (error (ncat-2 a b)))
                 fix_macro_name_kind!(ps, macro_name_position)
-                emit(ps, m, ckind, cflags)
+                emit(ps, m, ckind, cflags | set_numeric_flags(dim))
                 check_ncat_compat(ps, m, ckind)
                 emit(ps, mark, K"macrocall")
                 is_macrocall = false
@@ -1621,7 +1621,7 @@ function parse_call_chain(ps::ParseState, mark, is_macrocall=false)
                        ckind == K"comprehension" ? K"typed_comprehension"  :
                        ckind == K"ncat"          ? K"typed_ncat"           :
                        internal_error("unrecognized kind in parse_cat ", string(ckind))
-                emit(ps, mark, outk, cflags)
+                emit(ps, mark, outk, cflags | set_numeric_flags(dim))
                 check_ncat_compat(ps, mark, ckind)
             end
         elseif k == K"."
@@ -2840,7 +2840,7 @@ function parse_array(ps::ParseState, mark, closer, end_is_symbol)
     if binding_power == typemin(Int)
         # [x@y  ==>  (hcat x (error-t ✘ y))
         bump_closing_token(ps, closer)
-        return (K"hcat", EMPTY_FLAGS)
+        return (K"hcat", 0)
     end
     while true
         (next_dim, next_bp) = parse_array_inner(ps, binding_power, array_order)
@@ -2856,9 +2856,9 @@ function parse_array(ps::ParseState, mark, closer, end_is_symbol)
         binding_power = next_bp
     end
     bump_closing_token(ps, closer)
-    return binding_power == -1 ? (K"vcat", EMPTY_FLAGS) :
-           binding_power ==  0 ? (K"hcat", EMPTY_FLAGS) :
-           (K"ncat", set_numeric_flags(dim))
+    return binding_power == -1 ? (K"vcat", 0) :
+           binding_power ==  0 ? (K"hcat", 0) :
+           (K"ncat", dim)
 end
 
 # Parse equal and ascending precedence chains of array concatenation operators -
@@ -3012,7 +3012,8 @@ function parse_cat(ps::ParseState, closer, end_is_symbol)
     mark = position(ps)
     if k == closer
         # []  ==>  (vect)
-        return parse_vect(ps, closer, false)
+        ckind, cflags = parse_vect(ps, closer, false)
+        return (ckind, cflags, 0)
     elseif k == K";"
         #v1.8: [;]           ==>  (ncat-1)
         #v1.8: [;;]          ==>  (ncat-2)
@@ -3022,7 +3023,7 @@ function parse_cat(ps::ParseState, closer, end_is_symbol)
         dim, _ = parse_array_separator(ps, Ref(:unknown))
         min_supported_version(v"1.8", ps, mark, "empty multidimensional array syntax")
         bump_closing_token(ps, closer)
-        return (K"ncat", set_numeric_flags(dim))
+        return (K"ncat", EMPTY_FLAGS, dim)
     end
     parse_eq_star(ps)
     k = peek(ps, skip_newlines=true)
@@ -3035,15 +3036,18 @@ function parse_cat(ps::ParseState, closer, end_is_symbol)
         # [x]      ==>  (vect x)
         # [x \n ]  ==>  (vect x)
         # [x       ==>  (vect x (error-t))
-        parse_vect(ps, closer, prefix_trailing_comma)
+        ckind, cflags = parse_vect(ps, closer, prefix_trailing_comma)
+        return (ckind, cflags, 0)
     elseif k == K"for"
         # [x for a in as]  ==>  (comprehension (generator x (iteration (in a as))))
         # [x \n\n for a in as]  ==>  (comprehension (generator x (iteration (in a as))))
-        parse_comprehension(ps, mark, closer)
+        ckind, cflags = parse_comprehension(ps, mark, closer)
+        return (ckind, cflags, 0)
     else
         # [x y]  ==>  (hcat x y)
         # and other forms; See parse_array.
-        parse_array(ps, mark, closer, end_is_symbol)
+        ckind, dim = parse_array(ps, mark, closer, end_is_symbol)
+        return (ckind, EMPTY_FLAGS, dim)
     end
 end
 
@@ -3448,13 +3452,13 @@ function parse_string(ps::ParseState, raw::Bool)
     emit(ps, mark, string_kind, str_flags)
 end
 
-function emit_braces(ps, mark, ckind, cflags)
+function emit_braces(ps, mark, ckind, cflags, dim=0)
     if ckind == K"hcat"
         # {x y}  ==>  (bracescat (row x y))
         emit(ps, mark, K"row", cflags & ~TRAILING_COMMA_FLAG)
     elseif ckind == K"ncat"
         # {x ;;; y}  ==>  (bracescat (nrow-3 x y))
-        emit(ps, mark, K"nrow", cflags & ~TRAILING_COMMA_FLAG)
+        emit(ps, mark, K"nrow", set_numeric_flags(dim))
     end
     check_ncat_compat(ps, mark, ckind)
     outk = ckind in KSet"vect comprehension" ? K"braces" : K"bracescat"
@@ -3638,13 +3642,13 @@ function parse_atom(ps::ParseState, check_identifiers=true, has_unary_prefix=fal
         parse_paren(ps, check_identifiers, has_unary_prefix)
     elseif leading_kind == K"[" # cat expression
         bump(ps, TRIVIA_FLAG)
-        ckind, cflags = parse_cat(ps, K"]", ps.end_symbol)
-        emit(ps, mark, ckind, cflags)
+        ckind, cflags, dim = parse_cat(ps, K"]", ps.end_symbol)
+        emit(ps, mark, ckind, cflags | set_numeric_flags(dim))
         check_ncat_compat(ps, mark, ckind)
     elseif leading_kind == K"{" # cat expression
         bump(ps, TRIVIA_FLAG)
-        ckind, cflags = parse_cat(ps, K"}", ps.end_symbol)
-        emit_braces(ps, mark, ckind, cflags)
+        ckind, cflags, dim = parse_cat(ps, K"}", ps.end_symbol)
+        emit_braces(ps, mark, ckind, cflags, dim)
     elseif leading_kind == K"@" # macro call
         # Macro names can be keywords
         # @end x  ==> (macrocall @end x)

test/parser.jl

@@ -890,6 +890,8 @@ tests = [
         "{x,y,}"     =>  "(braces-, x y)"
         "{x y}"      =>  "(bracescat (row x y))"
         ((v=v"1.7",), "{x ;;; y}") =>  "(bracescat (nrow-3 x y))"
+        ((v=v"1.7",), "{a ;; b}") =>  "(bracescat (nrow-2 a b))"
+        ((v=v"1.7",), "{a ;;;; b}") =>  "(bracescat (nrow-4 a b))"
         # Macro names can be keywords
         "@end x" => "(macrocall @end x)"
         # __dot__ macro
@@ -929,6 +931,11 @@ tests = [
         # Column major
         ((v=v"1.7",), "[x ; y ;; z ; w ;;; a ; b ;; c ; d]")  =>
             "(ncat-3 (nrow-2 (nrow-1 x y) (nrow-1 z w)) (nrow-2 (nrow-1 a b) (nrow-1 c d)))"
+        # Dimension 4 ncat
+        ((v=v"1.7",), "[x ;;;; y]")  =>  "(ncat-4 x y)"
+        ((v=v"1.7",), "[a ; b ;;;; c ; d]")  =>  "(ncat-4 (nrow-1 a b) (nrow-1 c d))"
+        ((v=v"1.7",), "[a b ; c d ;;;; e f ; g h]")  =>
+            "(ncat-4 (nrow-1 (row a b) (row c d)) (nrow-1 (row e f) (row g h)))"
         # Array separators
         # Newlines before semicolons are not significant
         "[a \n ;]"  =>  "(vcat a)"