diff options
Diffstat (limited to 'lib/system/widestrs.nim')
| -rw-r--r-- | lib/system/widestrs.nim | 160 |
1 files changed, 0 insertions, 160 deletions
diff --git a/lib/system/widestrs.nim b/lib/system/widestrs.nim deleted file mode 100644 index 5a30a7c0f..000000000 --- a/lib/system/widestrs.nim +++ /dev/null @@ -1,160 +0,0 @@ -# -# -# Nim's Runtime Library -# (c) Copyright 2012 Andreas Rumpf -# -# See the file "copying.txt", included in this -# distribution, for details about the copyright. -# - -# Nim support for C/C++'s `wide strings`:idx:. This is part of the system -# module! Do not import it directly! - -when not declared(NimString): - {.error: "You must not import this module explicitly".} - -type - Utf16Char* = distinct int16 - WideCString* = ref array[0.. 1_000_000, Utf16Char] -{.deprecated: [TUtf16Char: Utf16Char].} - -proc len*(w: WideCString): int = - ## returns the length of a widestring. This traverses the whole string to - ## find the binary zero end marker! - while int16(w[result]) != 0'i16: inc result - -const - UNI_REPLACEMENT_CHAR = Utf16Char(0xFFFD'i16) - UNI_MAX_BMP = 0x0000FFFF - UNI_MAX_UTF16 = 0x0010FFFF - UNI_MAX_UTF32 = 0x7FFFFFFF - UNI_MAX_LEGAL_UTF32 = 0x0010FFFF - - halfShift = 10 - halfBase = 0x0010000 - halfMask = 0x3FF - - UNI_SUR_HIGH_START = 0xD800 - UNI_SUR_HIGH_END = 0xDBFF - UNI_SUR_LOW_START = 0xDC00 - UNI_SUR_LOW_END = 0xDFFF - -template ones(n: expr): expr = ((1 shl n)-1) - -template fastRuneAt(s: cstring, i: int, result: expr, doInc = true) = - ## Returns the unicode character ``s[i]`` in `result`. If ``doInc == true`` - ## `i` is incremented by the number of bytes that have been processed. - bind ones - - if ord(s[i]) <=% 127: - result = ord(s[i]) - when doInc: inc(i) - elif ord(s[i]) shr 5 == 0b110: - #assert(ord(s[i+1]) shr 6 == 0b10) - result = (ord(s[i]) and (ones(5))) shl 6 or (ord(s[i+1]) and ones(6)) - when doInc: inc(i, 2) - elif ord(s[i]) shr 4 == 0b1110: - #assert(ord(s[i+1]) shr 6 == 0b10) - #assert(ord(s[i+2]) shr 6 == 0b10) - result = (ord(s[i]) and ones(4)) shl 12 or - (ord(s[i+1]) and ones(6)) shl 6 or - (ord(s[i+2]) and ones(6)) - when doInc: inc(i, 3) - elif ord(s[i]) shr 3 == 0b11110: - #assert(ord(s[i+1]) shr 6 == 0b10) - #assert(ord(s[i+2]) shr 6 == 0b10) - #assert(ord(s[i+3]) shr 6 == 0b10) - result = (ord(s[i]) and ones(3)) shl 18 or - (ord(s[i+1]) and ones(6)) shl 12 or - (ord(s[i+2]) and ones(6)) shl 6 or - (ord(s[i+3]) and ones(6)) - when doInc: inc(i, 4) - else: - result = 0xFFFD - when doInc: inc(i) - -iterator runes(s: cstring): int = - var - i = 0 - result: int - while s[i] != '\0': - fastRuneAt(s, i, result, true) - yield result - -proc newWideCString*(source: cstring, L: int): WideCString = - unsafeNew(result, L * 4 + 2) - #result = cast[wideCString](alloc(L * 4 + 2)) - var d = 0 - for ch in runes(source): - if ch <=% UNI_MAX_BMP: - if ch >=% UNI_SUR_HIGH_START and ch <=% UNI_SUR_LOW_END: - result[d] = UNI_REPLACEMENT_CHAR - else: - result[d] = Utf16Char(toU16(ch)) - elif ch >% UNI_MAX_UTF16: - result[d] = UNI_REPLACEMENT_CHAR - else: - let ch = ch -% halfBase - result[d] = Utf16Char(toU16((ch shr halfShift) +% UNI_SUR_HIGH_START)) - inc d - result[d] = Utf16Char(toU16((ch and halfMask) +% UNI_SUR_LOW_START)) - inc d - result[d] = Utf16Char(0'i16) - -proc newWideCString*(s: cstring): WideCString = - if s.isNil: return nil - - when not declared(c_strlen): - proc c_strlen(a: cstring): int {. - header: "<string.h>", noSideEffect, importc: "strlen".} - - let L = c_strlen(s) - result = newWideCString(s, L) - -proc newWideCString*(s: string): WideCString = - result = newWideCString(s, s.len) - -proc `$`*(w: WideCString, estimate: int, replacement: int = 0xFFFD): string = - result = newStringOfCap(estimate + estimate shr 2) - - var i = 0 - while w[i].int16 != 0'i16: - var ch = int(cast[uint16](w[i])) - inc i - if ch >= UNI_SUR_HIGH_START and ch <= UNI_SUR_HIGH_END: - # If the 16 bits following the high surrogate are in the source buffer... - let ch2 = int(cast[uint16](w[i])) - - # If it's a low surrogate, convert to UTF32: - if ch2 >= UNI_SUR_LOW_START and ch2 <= UNI_SUR_LOW_END: - ch = (((ch and halfMask) shl halfShift) + (ch2 and halfMask)) + halfBase - inc i - else: - #invalid UTF-16 - ch = replacement - elif ch >= UNI_SUR_LOW_START and ch <= UNI_SUR_LOW_END: - #invalid UTF-16 - ch = replacement - - if ch < 0x80: - result.add chr(ch) - elif ch < 0x800: - result.add chr((ch shr 6) or 0xc0) - result.add chr((ch and 0x3f) or 0x80) - elif ch < 0x10000: - result.add chr((ch shr 12) or 0xe0) - result.add chr(((ch shr 6) and 0x3f) or 0x80) - result.add chr((ch and 0x3f) or 0x80) - elif ch <= 0x10FFFF: - result.add chr((ch shr 18) or 0xf0) - result.add chr(((ch shr 12) and 0x3f) or 0x80) - result.add chr(((ch shr 6) and 0x3f) or 0x80) - result.add chr((ch and 0x3f) or 0x80) - else: - # replacement char(in case user give very large number): - result.add chr(0xFFFD shr 12 or 0b1110_0000) - result.add chr(0xFFFD shr 6 and ones(6) or 0b10_0000_00) - result.add chr(0xFFFD and ones(6) or 0b10_0000_00) - -proc `$`*(s: WideCString): string = - result = s $ 80 |