libgumbo

This is an internal fork of the libgumbo library, which was copied and later modified under the terms of the Apache 2.0 license. See lua-gumbo commit 0a04728 for details of the original import.

Since importing the code, the following notable fixes and improvements have been made:

• 91cef89: Re-implement adjust_foreign_attributes() with a gperf hash
• b11abe7: Pass TagSet arrays into functions by reference instead of value
• b73dc03: Simplify maybe_replace_codepoint() function
• d5d0bb3: Remove special handling of <menuitem> tag
• 7bd5162: Remove special handling of <isindex> tag
• a5c1b0e: Use realloc(3) instead of malloc(3) in enlarge_vector_if_full()
• dcbebd7: Use realloc(3) instead of malloc(3) in maybe_resize_string_buffer()
• df15262: Make destroy_node() function non-recursive
• 2df37f5: Fix signedness of some format specifiers
• 176553e: Add maximum element nesting limit
• bed0f4a: Annotate gumbo_debug() with PRINTF macro and fix warnings
• 7ffc218: Annotate print_message() with PRINTF macro and fix warnings
• 1bd8ab5, 9136507, 53a1f9a: Deduplicate some identical TagSet arrays
• a7a9065: Add some GCC/Clang function attributes
• 8d3d4e4: Remove custom allocator support
• 8d3b006: Fix recording of source positions for </form> end tags
• 1a8d763: Replace linear search in maybe_replace_codepoint() with a lookup table
• 6dca79e: Replace strcasecmp() and strncasecmp() with ascii-only equivalents
• 17ab1d2: Fix TAGSET_INCLUDES macro to work properly with multiple bit flags
• 7e56d45: Re-implement gumbo_normalize_svg_tagname() with a gperf hash
• a518d35: Replace linear array search in adjust_svg_attributes() with a gperf hash
• a4a7433: Fix duplicate TagSet initializer being ignored in is_special_node()
• 8137fcd: Add support for <dialog> tag
• 4b35471: Add missing static qualifiers to hide symbols that shouldn't be extern
• df57c59, 03101f3, ea62330: Replace use of locale-dependant ctype.h functions with custom, ASCII-only equivalents