stefanspringer1/fastreplace

This package offers an efficient way to replace certain Unicode code points (either represented by UnicodeScalar or UInt32) with other values. Those methods might be more efficient than the replacement methods of the Swift standard library where grapheme clusters are consider

Duplicate keys produced by a macro

Be careful not to produce duplicate keys by using e.g. the #codepoint or #codepointForEntity macro: The following code compiles without a warning (at least with Swift version 6.0.0, cf. the bug report):

 text.replacing([
    #codepointForEntity("&half;"): " 1 / 2 ",
    #codepointForEntity("&frac12;"): " 1 / 2 ",
    #codepointForEntity("&frac13;"): " 1 / 3 ",
])

But #codepointForEntity("&half;") and #codepointForEntity("½") are both expanded to 0xBD, so we have defined a dictionary with duplicate keys. If you used this value directly as keys, this would produce the warning “Dictionary literal of type '[UInt32 : String]' has duplicate entries for integer literal key '0xBD'”. The lack of warning in the case of the macro usage is fatal, because during the run the program then crashes with a Trace/BPT trap ... error.

Package Metadata

Repository: stefanspringer1/fastreplace

Default branch: main

README: README.md