cp.utf16.le

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

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API Overview

Functions - API calls offered directly by the extension

• char
• codepoint
• codes
• len
• len
• offset

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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.
Notes	None
Examples	None
Source	src/extensions/cp/utf16/le.lua line 10

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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.
Notes	None
Examples	None
Source	src/extensions/cp/utf16/le.lua line 21

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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
Notes	For example: lua</li><li> for p, c in utf16.codes(s) do body end</li><li> will iterate over all characters in string s, with p being the position (in bytes) and c the code point of each character. It raises an error if it meets any invalid byte sequence.
Examples	None
Source	src/extensions/cp/utf16/le.lua line 34

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len

Signature	cp.utf16.len (bigEndian, s [, i [, j]]) -> number | boolean, number
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.
Notes	None
Examples	None
Source	src/extensions/cp/utf16/init.lua line 186

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len

Signature	cp.utf16.le.len (s [, i [, j]]) -> number | boolean, number
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.
Notes	None
Examples	None
Source	src/extensions/cp/utf16/le.lua line 53

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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
Notes	As a special case, when n is 0 the function returns the start of the encoding of the character that contains the i-th byte of s. This function assumes that s is a valid UTF-16 string
Examples	None
Source	src/extensions/cp/utf16/le.lua line 66

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