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base/strings: Add documentation to unicode conversion table #56929

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base/strings: Add documentation to unicode conversion table #56929

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base/strings: Add documentation to unicode conversion table
eschnett Jan 1, 2025
7535b58
Update base/strings/unicode.jl
eschnett Jan 1, 2025
2600c4a
Merge branch 'master' into patch-4
eschnett Jan 10, 2025
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21 changes: 14 additions & 7 deletions base/strings/unicode.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -174,14 +174,21 @@ function utf8proc_map(str::Union{String,SubString{String}}, options::Integer, ch
return String(resize!(buffer, nbytes))
end

# from julia_charmap.h, used by julia_chartransform in the Unicode stdlib
"""
`Dict` of `original codepoint => replacement codepoint` normalizations
to perform on Julia identifiers, to canonicalize characters that
are both easily confused and easily inputted by accident.

!!! warning
When this table is updated, also update the corresponding table in `src/flisp/julia_charmap.h`.
"""
const _julia_charmap = Dict{UInt32,UInt32}(
0x025B => 0x03B5,
0x00B5 => 0x03BC,
0x00B7 => 0x22C5,
0x0387 => 0x22C5,
0x2212 => 0x002D,
0x210F => 0x0127,
0x025B => 0x03B5, # latin small letter open e -> greek small letter epsilon
0x00B5 => 0x03BC, # micro sign -> greek small letter mu
0x00B7 => 0x22C5, # middot char -> dot operator (#25098)
0x0387 => 0x22C5, # Greek interpunct -> dot operator (#25098)
0x2212 => 0x002D, # minus -> hyphen-minus (#26193)
0x210F => 0x0127, # hbar -> small letter h with stroke (#48870)
)

utf8proc_map(s::AbstractString, flags::Integer, chartransform::F = identity) where F = utf8proc_map(String(s), flags, chartransform)
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