docs » cp.utf16.le


A pure-LUA implementation of UTF-16 decoding with little-endian ordering.

API Overview

API Documentation

Functions

char

Signature cp.utf16.le.char(...) -> string
Type Function
Description Receives zero or more integers, converts each one to its corresponding UTF-16 byte sequence and returns a string with the concatenation of all these sequences.
Parameters
  • `...` - The list of UCL codepoint integers to convert.
Returns
  • All the codepoints converted to UTF-16, concatonated into a string.

codepoint

Signature cp.utf16.le.codepoint(s [, i [, j]]) -> integer...
Type Function
Description Returns the codepoints (as integers) from all characters in s that start between byte position i and j (both included). The default for i is 1 and for j is i. It raises an error if it meets any invalid byte sequence.
Parameters
  • `s` - The string
  • `i` - The starting index. Defaults to `1`.
  • `j` - The ending index. Defaults to `i`.
Returns
  • a list of codepoint integers for all characters in the matching range.

codes

Signature cp.utf16.le.codes(s) -> iterator
Type Function
Description Returns values so that the construction
Parameters
  • `s` - The string to iterate through.
Returns
  • An iterator

len

Signature `cp.utf16.len (bigEndian, s [, i [, j]]) -> number boolean, number` </span>
Type Function
Description Returns the number of UTF-16 characters in string s that start between positions i and j (both inclusive). The default for i is 1 and for j is -1. If it finds any invalid byte sequence, returns a false value plus the position of the first invalid byte.
Parameters
  • `bigEndian` - If true, the string is 'big-endian'.
  • `s` - The UTF-16 string
  • `i` - The starting index. Defaults to `1`.
  • `j` - The ending index. Defaults to `-1`.
Returns
  • the length, or `false` and the first invalid byte index.

len

Signature `cp.utf16.le.len (s [, i [, j]]) -> number boolean, number` </span>
Type Function
Description Returns the number of UTF-16 characters in string s that start between positions i and j (both inclusive). The default for i is 1 and for j is -1. If it finds any invalid byte sequence, returns a false value plus the position of the first invalid byte.
Parameters
  • `s` - The UTF-16 string
  • `i` - The starting index. Defaults to `1`.
  • `j` - The ending index. Defaults to `-1`.
Returns
  • the length, or `false` and the first invalid byte index.

offset

Signature cp.utf16.le.offset (s, n [, i]) -> number
Type Function
Description Returns the position (in bytes) where the encoding of the n-th character of s (counting from position i) starts. A negative n gets characters before position i. The default for i is 1 when n is non-negative and #s + 1 otherwise, so that utf8.offset(s, -n) gets the offset of the n-th character from the end of the string. If the specified character is neither in the subject nor right after its end, the function returns nil.
Parameters
  • `s` - The string
  • `n` - The character number to find.
  • `i` - The initial position to start from.
Returns
  • The index

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