perf(sanitizer): avoid Token() allocations in stripIter#4443
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Tokenizer.Token() allocates a Token struct and parses the full attribute slice for every start tag, even though stripIter only consumes text tokens. Switch to checking the TokenType from Next() and calling Text() only for text tokens. Shared by StripTags and TruncateHTML, both called per entry: StripTags 247KB -> 71KB/op (-71%), 12623 -> 4423 allocs (-65%) TruncateHTML 19KB -> 7.9KB/op (-59%), 819 -> 297 allocs (-64%) Both roughly 2x faster on tag-heavy input.
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Tokenizer.Token() allocates a Token struct and parses the full attribute slice for every start tag, even though stripIter only consumes text tokens. Switch to checking the TokenType from Next() and calling Text() only for text tokens.
Shared by StripTags and TruncateHTML, both called per entry:
StripTags 247KB -> 71KB/op (-71%), 12623 -> 4423 allocs (-65%)
TruncateHTML 19KB -> 7.9KB/op (-59%), 819 -> 297 allocs (-64%)
Both roughly 2x faster on tag-heavy input.
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