highlighting: Handle generic operators after refactor (#26)

Pass syntax nodes to JuliaSyntax precedence predicates so generic K"Operator" tokens retain their SyntaxHead flags while highlighting parse-error subtrees.

Also include all multi-character lexer operators that no longer have dedicated kinds in the operator-name fallback used for identifier-like operator leaves.

Fixes JuliaLang/julia#62103

Co-authored-by: Keno Fischer <Keno@users.noreply.github.com>
Co-authored-by: OpenAI Codex <codex@openai.com>

Author: Keno

src/JuliaSyntaxHighlighting.jl

@@ -67,7 +67,8 @@ if isdefined(JuliaSyntax, :generic_operators_by_level)
     end
 end
 union!(OPERATOR_KINDS, ("==", "===", "!=", "!==", "<=", ">=",
-                        "<<", ">>", ">>>", "//", "|>", "<|", "=>"))
+                        "<<", ">>", ">>>", "//", "|>", "<|", "=>",
+                        "<--", "<-->"))
 
 """
     BUILTIN_FUNCTIONS
@@ -333,7 +334,7 @@ function _hl_annotations!(highlights::Vector{@NamedTuple{region::UnitRange{Int},
         :julia_builtin
     elseif (nkind in (K"&&", K"||", K"<:") || regionstr == "===") && JuliaSyntax.is_trivia(node)
         :julia_builtin
-    elseif JuliaSyntax.is_prec_comparison(nkind) && JuliaSyntax.is_trivia(node);
+    elseif JuliaSyntax.is_prec_comparison(node) && JuliaSyntax.is_trivia(node);
         :julia_comparator
     elseif isplainoperator(node, pnode)
         :julia_operator

test/runtests.jl

@@ -27,6 +27,16 @@ astr_sum1to8 = Base.AnnotatedString("sum(1:8)")
 @test highlight!(astr_sum1to8) == sum1to8_highlighted
 @test astr_sum1to8 == sum1to8_highlighted
 
+# Ensure generic operators inside parse error nodes do not crash highlighting.
+@test any(a -> a.region == 5:5 && a.value == :julia_operator,
+          Base.annotations(highlight("1 2 / 3")))
+@test any(a -> a.region == 5:6 && a.value == :julia_operator,
+          Base.annotations(highlight("1 2 == 3")))
+@test any(a -> a.region == 3:5 && a.value == :julia_operator,
+          Base.annotations(highlight("1 <-- 2")))
+@test any(a -> a.region == 3:6 && a.value == :julia_operator,
+          Base.annotations(highlight("1 <--> 2")))
+
 # Check for string indexing issues
 @test Base.annotations(highlight(":π")) |> first |> first == 1:3