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htmlpurifier/docs/code-quality.txt

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Code Quality Issues
Okay, face it. Programmers can get lazy, cut corners, or make mistakes. They
also can do quick prototypes, and then forget to rewrite them later. Well,
while I can't list mistakes in here, I can list prototype-like segments
of code that should be aggressively refactored after the beta is released.
This does not list optimization issues, that needs to be done after intense
profiling.
Here we go:
AttrDef
Class - doesn't support Unicode characters, uses regular expressions
Lang - code duplication, premature optimization, doesn't consult official
lists
Pixels/Length/MultiLength - implemented according to HTML spec (excludes
code reuse in CSS)
URI - multiple regular expressions, needs host validation routines factored
out for mailto scheme, IPv6 validation is broken (fringe), unintuitive
variable overwriting, missing validation for query, fragment and path,
no percent-encode fixing
CSS - parser doesn't accept advanced CSS (fringe)
AttrTransform - doesn't accept AttrContext, non-validating
Lang - invalid xml:lang value can overwrite valid lang value (fringe)
ChildDef - not-allowed nodes translated to text, likely invalid handling
Config - "load configuration" hooks missing, rich set* accessors missing
Strategy
FixNesting - cannot bubble nodes out of structures
MakeWellFormed - insufficient automatic closing definitions
RemoveForeignElements - should be run in parallel with MakeWellFormed
URIScheme - needs to have callable generic checks
ftp - missing typecode check
mailto - doesn't validate emails
news - doesn't validate opaque path
nntp - doesn't constrain path
EOL