141 lines
3.7 KiB
C++
141 lines
3.7 KiB
C++
#ifndef unicode_hh_INCLUDED
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#define unicode_hh_INCLUDED
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#include <cwctype>
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#include <cwchar>
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#include "array_view.hh"
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#include "ranges.hh"
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#include "units.hh"
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namespace Kakoune
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{
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using Codepoint = char32_t;
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inline bool is_eol(Codepoint c) noexcept
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{
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return c == '\n';
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}
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inline bool is_horizontal_blank(Codepoint c) noexcept
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{
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// Characters considered whitespace by ECMA Regex Spec
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// minus vertical tab
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// <https://262.ecma-international.org/11.0/#sec-white-space>
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return c == '\t' or
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c == '\f' or
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c == ' ' or
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c == U'\u00A0' or
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c == U'\uFEFF' or
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c == U'\u1680' or
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c == U'\u2000' or
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c == U'\u2001' or
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c == U'\u2002' or
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c == U'\u2003' or
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c == U'\u2004' or
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c == U'\u2005' or
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c == U'\u2006' or
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c == U'\u2007' or
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c == U'\u2008' or
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c == U'\u2009' or
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c == U'\u200A' or
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c == U'\u2028' or
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c == U'\u2029' or
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c == U'\u202F' or
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c == U'\u205F' or
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c == U'\u3000' ;
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}
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inline bool is_blank(Codepoint c) noexcept
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{
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// Characters considered Line Terminators by ECMA Regex Spec
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// plus vertical tab
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// <https://262.ecma-international.org/11.0/#sec-line-terminators>
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return c == '\n' or
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c == '\r' or
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c == '\v' or
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c == U'\u2028' or
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c == U'\u2029' or
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is_horizontal_blank(c) ;
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}
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enum WordType { Word, WORD };
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template<WordType word_type = Word>
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inline bool is_word(Codepoint c, ConstArrayView<Codepoint> extra_word_chars = {'_'}) noexcept
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{
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return iswalnum((wchar_t)c) or contains(extra_word_chars, c);
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}
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template<>
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inline bool is_word<WORD>(Codepoint c, ConstArrayView<Codepoint>) noexcept
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{
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return not is_blank(c);
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}
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inline bool is_punctuation(Codepoint c, ConstArrayView<Codepoint> extra_word_chars = {'_'}) noexcept
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{
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return not (is_word(c, extra_word_chars) or is_blank(c));
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}
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inline bool is_basic_alpha(Codepoint c) noexcept
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{
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return (c >= 'a' and c <= 'z') or (c >= 'A' and c <= 'Z');
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}
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inline bool is_basic_digit(Codepoint c) noexcept
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{
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return c >= '0' and c <= '9';
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}
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inline bool is_identifier(Codepoint c) noexcept
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{
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return is_basic_alpha(c) or is_basic_digit(c) or
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c == '_' or c == '-';
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}
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inline ColumnCount codepoint_width(Codepoint c) noexcept
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{
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if (c == '\n')
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return 1;
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const auto width = wcwidth((wchar_t)c);
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return width >= 0 ? width : 1;
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}
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enum class CharCategories
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{
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Blank,
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EndOfLine,
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Word,
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Punctuation,
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};
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template<WordType word_type = Word>
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inline CharCategories categorize(Codepoint c, ConstArrayView<Codepoint> extra_word_chars) noexcept
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{
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if (is_eol(c))
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return CharCategories::EndOfLine;
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if (is_horizontal_blank(c))
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return CharCategories::Blank;
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if (word_type == WORD or is_word(c, extra_word_chars))
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return CharCategories::Word;
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return CharCategories::Punctuation;
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}
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inline Codepoint to_lower(Codepoint cp) noexcept { return towlower((wchar_t)cp); }
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inline Codepoint to_upper(Codepoint cp) noexcept { return towupper((wchar_t)cp); }
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inline bool is_lower(Codepoint cp) noexcept { return iswlower((wchar_t)cp); }
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inline bool is_upper(Codepoint cp) noexcept { return iswupper((wchar_t)cp); }
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inline char to_lower(char c) noexcept { return c >= 'A' and c <= 'Z' ? c - 'A' + 'a' : c; }
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inline char to_upper(char c) noexcept { return c >= 'a' and c <= 'z' ? c - 'a' + 'A' : c; }
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inline bool is_lower(char c) noexcept { return c >= 'a' and c <= 'z'; }
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inline bool is_upper(char c) noexcept { return c >= 'A' and c <= 'Z'; }
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}
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#endif // unicode_hh_INCLUDED
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