Only strip the delimiters of matched custom class blocks

[Amoifr]

Fixes #206.

CustomClassInjection::parse() removed the block delimiters with a global str_replace(), so as soon as a snippet contains one {:class:...:} block, every other :} in it is removed as well, and the tokens after it are rendered at the wrong position. For example:

{:hl-em:x:} = "{:}".format(y)
print({:hl-em:x:})

was rendered as x = "{".format(y) and print(x)x.

The content is now built with preg_replace_callback() on the same pattern, so only the delimiters of the matched blocks are removed. The offsets were already computed against the original string and do not change.

Note: the example from the issue renders fine on main (foo sits at offset 34 of the input, not 33). The bug only shows up when the code itself contains a :} outside of a block, which is what the new test covers.

[github-actions]

Benchmark Results

Comparison of fix-206-custom-class-literal-end-token against main (e04f3d4dd65a7ce3456537584e38cec2eedddd3b).

Open to see the benchmark results

benchmark	subject	set	revs	its	mem_peak	mode	rstdev
HighlighterBench	benchParse	apache	100	5	2.071mb +0.02%	73.865186μs +1.24%	±1.16% -11.75%
HighlighterBench	benchParse	bash	100	5	2.102mb +0.02%	204.620509μs -0.44%	±0.85% -9.52%
HighlighterBench	benchParse	bbcode	100	5	2.059mb +0.02%	74.767906μs +0.23%	±0.76% -46.93%
HighlighterBench	benchParse	blade	100	5	2.675mb +0.02%	1,098.776438μs +0.04%	±0.67% -44.33%
HighlighterBench	benchParse	css	100	5	2.089mb +0.02%	140.595597μs +0.31%	±0.74% -24.23%
HighlighterBench	benchParse	diff	100	5	2.093mb +0.02%	99.494971μs +1.56%	±0.75% -32.37%
HighlighterBench	benchParse	dockerfile	100	5	2.063mb +0.02%	90.474540μs +0.88%	±1.29% +9.06%
HighlighterBench	benchParse	dotenv	100	5	2.074mb +0.02%	78.078748μs +1.34%	±0.39% -64.56%
HighlighterBench	benchParse	gdscript	100	5	2.169mb +0.02%	334.997867μs +0.35%	±0.59% -10.47%
HighlighterBench	benchParse	graphql	100	5	2.090mb +0.02%	153.210078μs -0.16%	±0.39% -43.61%
HighlighterBench	benchParse	html	100	5	2.093mb +0.02%	117.074892μs +0.29%	±1.67% +225.84%
HighlighterBench	benchParse	http	100	5	2.063mb +0.02%	25.252838μs +3.46%	±1.42% -33.67%
HighlighterBench	benchParse	ini	100	5	2.078mb +0.02%	87.198063μs -0.42%	±0.39% -22.09%
HighlighterBench	benchParse	javascript	100	5	2.157mb +0.02%	273.595714μs -0.76%	±1.21% +2.64%
HighlighterBench	benchParse	json	100	5	2.132mb +0.02%	239.966712μs -0.32%	±0.63% -22.00%
HighlighterBench	benchParse	markdown	100	5	2.080mb +0.02%	76.279628μs +0.58%	±0.53% +11.53%
HighlighterBench	benchParse	nginx	100	5	2.144mb +0.02%	267.734697μs +0.21%	±0.25% -79.84%
HighlighterBench	benchParse	php	100	5	2.436mb +0.02%	761.280000μs +0.58%	±0.48% -2.92%
HighlighterBench	benchParse	python	100	5	2.333mb +0.02%	420.367358μs -0.48%	±0.38% -51.32%
HighlighterBench	benchParse	scss	100	5	2.105mb +0.02%	184.204070μs +0.56%	±0.86% +119.32%
HighlighterBench	benchParse	sql	100	5	2.104mb +0.02%	159.419550μs +0.05%	±0.41% -28.81%
HighlighterBench	benchParse	svelte	100	5	2.309mb +0.02%	1,085.331389μs -0.05%	±0.37% -68.18%
HighlighterBench	benchParse	terminal	100	5	2.099mb +0.02%	189.654403μs +0.77%	±0.46% -17.00%
HighlighterBench	benchParse	terraform	100	5	2.104mb +0.02%	176.763679μs +1.11%	±0.35% -60.37%
HighlighterBench	benchParse	typescript	100	5	2.530mb +0.02%	250.980705μs -0.09%	±0.39% -38.49%
HighlighterBench	benchParse	txt	100	5	2.046mb 0.00%	8.718082μs +3.33%	±1.39% +9.64%
HighlighterBench	benchParse	twig	100	5	19.211mb +0.00%	1,501.013581μs +2.44%	±0.51% +6.80%
HighlighterBench	benchParse	vue	100	5	2.387mb +0.02%	420.729530μs +1.19%	±0.40% +79.87%
HighlighterBench	benchParse	xml	100	5	2.107mb +0.02%	180.108904μs +0.82%	±0.48% -73.34%
HighlighterBench	benchParse	yaml	100	5	2.165mb +0.02%	319.897299μs -0.08%	±0.37% -81.47%

_{Generated by phpbench against commit e8dcf5d}