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fix: don't emit empty tail tokens (#1121)

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When tokens are split into lines, tokens that end with a newline are
emitted again as an empty token, which is confusing and doesn't have any
benefit. This conversion shouldn't emit a empty tail token.

Adds a test.

I noticed this issue by a CI failure for the output of a Go program that
was changed because of
d0ad679444 and the new output contained a
empty whitespace token at the beginning of most lines.
This commit is contained in:
Gusted
2025-08-27 11:51:01 +02:00
committed by GitHub
parent 4e1403e088
commit e9ffd5a79a
2 changed files with 49 additions and 1 deletions
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42
formatters/html/html_test.go
View File

@@ -49,6 +49,48 @@ func TestSplitTokensIntoLines(t *testing.T) {
}
actual := chroma.SplitTokensIntoLines(in)
assert.Equal(t, expected, actual)
in = []chroma.Token{
{Value: "func", Type: chroma.KeywordDeclaration},
{Value: " ", Type: chroma.TextWhitespace},
{Value: "main", Type: chroma.NameFunction},
{Value: "()", Type: chroma.Punctuation},
{Value: " ", Type: chroma.TextWhitespace},
{Value: "{", Type: chroma.Punctuation},
{Value: "\n\t", Type: chroma.TextWhitespace},
{Value: "println", Type: chroma.NameBuiltin},
{Value: "(", Type: chroma.Punctuation},
{Value: `"mark this"`, Type: chroma.LiteralString},
{Value: ")", Type: chroma.Punctuation},
{Value: "\n", Type: chroma.TextWhitespace},
{Value: "}", Type: chroma.Punctuation},
{Value: "\n", Type: chroma.TextWhitespace},
}
expected = [][]chroma.Token{
{
{Type: chroma.KeywordDeclaration, Value: "func"},
{Type: chroma.TextWhitespace, Value: " "},
{Type: chroma.NameFunction, Value: "main"},
{Type: chroma.Punctuation, Value: "()"},
{Type: chroma.TextWhitespace, Value: " "},
{Type: chroma.Punctuation, Value: "{"},
{Type: chroma.TextWhitespace, Value: "\n"},
},
{
{Type: chroma.TextWhitespace, Value: "\t"},
{Type: chroma.NameBuiltin, Value: "println"},
{Type: chroma.Punctuation, Value: "("},
{Type: chroma.LiteralString, Value: `"mark this"`},
{Type: chroma.Punctuation, Value: ")"},
{Type: chroma.TextWhitespace, Value: "\n"},
},
{
{Type: chroma.Punctuation, Value: "}"},
{Type: chroma.TextWhitespace, Value: "\n"},
},
}
actual = chroma.SplitTokensIntoLines(in)
assert.Equal(t, expected, actual)
}
func TestFormatterStyleToCSS(t *testing.T) {

8
iterator.go
View File

@@ -58,6 +58,7 @@ func Literator(tokens ...Token) Iterator {
// SplitTokensIntoLines splits tokens containing newlines in two.
func SplitTokensIntoLines(tokens []Token) (out [][]Token) {
var line []Token // nolint: prealloc
tokenLoop:
for _, token := range tokens {
for strings.Contains(token.Value, "\n") {
parts := strings.SplitAfterN(token.Value, "\n", 2)
@@ -70,6 +71,11 @@ func SplitTokensIntoLines(tokens []Token) (out [][]Token) {
line = append(line, clone)
out = append(out, line)
line = nil
// If the tail token is empty, don't emit it.
if len(token.Value) == 0 {
continue tokenLoop
}
}
line = append(line, token)
}
@@ -83,5 +89,5 @@ func SplitTokensIntoLines(tokens []Token) (out [][]Token) {
out = out[:len(out)-1]
}
}
return
return out
}