README.md

lua-utf8

Name

lua-utf8, simple, lightweight utf8 lib in pure lua.

Description

This library implements several basic function for utf8 strings in pure lua with no dependency.

• Methods
  • validate
  • len
  • reverse
  • sub

Methods

validate

Validate whether the given string is a valid utf8 string.

syntax: valid, invalid_pos = utf8.validate(str)

Args:

• str: string

Returns:

• valid (bool) whether the input string is a valid utf8 string.

• invalid_pos (number) position of the first invalid byte in the given string.

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len

Get the given string len of utf8.

syntax len, invalid_pos = utf8.len(str)

Args:

• str: string

Returns:

• len (number) the length of valid utf8 string part.

• invalid_pos (number) position of the first invalid byte in the given string.

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reverse

Reverse a given valid utf8 string.

syntax s = utf8.reverse(str)

Args:

• str: string

Returns:

• s (string) a reversed utf8 string of the given string.

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sub

Sub the given valid utf8 string with the given index.

syntax s = utf8.sub(str, s, e)

Args:

• str: string

• s: number, start index of utf8 character

• e: number, end index of utf8 character

Returns:

• s (string) utf8 sub string

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