1Uchar(3)                         OCaml library                        Uchar(3)
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NAME

6       Uchar - Unicode characters.
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Module

9       Module   Uchar
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Documentation

12       Module Uchar
13        : sig end
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16       Unicode characters.
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19       Since 4.03
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25       type t
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28       The type for Unicode characters.
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30       A  value of this type represents a Unicode scalar value which is an in‐
31       teger in the ranges 0x0000 ...  0xD7FF or 0xE000 ...  0x10FFFF .
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35       val min : t
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38       min is U+0000.
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42       val max : t
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45       max is U+10FFFF.
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49       val bom : t
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52       bom is U+FEFF, the byte order mark (BOM) character.
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55       Since 4.06.0
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59       val rep : t
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62       rep is U+FFFD, the replacement character.
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65       Since 4.06.0
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69       val succ : t -> t
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72       succ u is the scalar value after u in the set of Unicode scalar values.
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75       Raises Invalid_argument if u is Uchar.max .
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79       val pred : t -> t
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82       pred u is the scalar value before u in the set of Unicode  scalar  val‐
83       ues.
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86       Raises Invalid_argument if u is Uchar.min .
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90       val is_valid : int -> bool
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93       is_valid  n is true if and only if n is a Unicode scalar value (i.e. in
94       the ranges 0x0000 ...  0xD7FF or 0xE000 ...  0x10FFFF ).
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98       val of_int : int -> t
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101       of_int i is i as a Unicode character.
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104       Raises Invalid_argument if i does not satisfy Uchar.is_valid .
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108       val to_int : t -> int
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111       to_int u is u as an integer.
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115       val is_char : t -> bool
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118       is_char u is true if and only if u is a latin1 OCaml character.
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122       val of_char : char -> t
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125       of_char c is c as a Unicode character.
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129       val to_char : t -> char
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132       to_char u is u as an OCaml latin1 character.
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135       Raises Invalid_argument if u does not satisfy Uchar.is_char .
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139       val equal : t -> t -> bool
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142       equal u u' is u = u' .
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146       val compare : t -> t -> int
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149       compare u u' is Stdlib.compare u u' .
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153       val hash : t -> int
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156       hash u associates a non-negative integer to u .
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161   UTF codecs tools
162       type utf_decode
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165       The type for UTF decode results. Values of this type represent the  re‐
166       sult of a Unicode Transformation Format decoding attempt.
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170       val utf_decode_is_valid : utf_decode -> bool
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173       utf_decode_is_valid d is true if and only if d holds a valid decode.
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177       val utf_decode_uchar : utf_decode -> t
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180       utf_decode_uchar  d  is  the  Unicode character decoded by d if utf_de‐
181       code_is_valid d is true and Uchar.rep otherwise.
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185       val utf_decode_length : utf_decode -> int
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188       utf_decode_length d is the number of elements from the source that were
189       consumed by the decode d . This is always strictly positive and smaller
190       or equal to 4 . The kind of source elements depends on the  actual  de‐
191       coder;  for  the  decoders of the standard library this function always
192       returns a length in bytes.
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196       val utf_decode : int -> t -> utf_decode
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199       utf_decode n u is a valid UTF decode for u  that  consumed  n  elements
200       from  the source for decoding.  n must be positive and smaller or equal
201       to 4 (this is not checked by the module).
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205       val utf_decode_invalid : int -> utf_decode
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208       utf_decode_invalid n is an invalid UTF decode that consumed n  elements
209       from the source to error.  n must be positive and smaller or equal to 4
210       (this is not checked by the module). The resulting decode has Uchar.rep
211       as the decoded Unicode character.
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215       val utf_8_byte_length : t -> int
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218       utf_8_byte_length u is the number of bytes needed to encode u in UTF-8.
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222       val utf_16_byte_length : t -> int
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225       utf_16_byte_length  u  is  the  number  of  bytes needed to encode u in
226       UTF-16.
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232OCamldoc                          2022-07-22                          Uchar(3)