Kbase P82165: I18N What is Canonical decomposition
| Autor |
Progress Software Corporation - Progress |
| Acesso |
Público |
| Publicação |
27/05/2004 |
|
Status: Unverified
GOAL:
I18N What is Canonical decomposition
FIX:
Canonical decomposition is the process of taking a string, recursively replacing composite characters using the Unicode canonical decomposition mappings (including the algorithmic Hangul canonical decomposition mappings), and putting the result in canonical order.
Example of decomposition:
Take the string with the characters "ác´¸" (a-acute, c, acute, cedilla)
The data file contains the following relevant information:
code; name; ... combining class; ... decomposition.
0061;LATIN SMALL LETTER A;...0;...
0063;LATIN SMALL LETTER C;...0;...
00E1;LATIN SMALL LETTER A WITH ACUTE;...0;...0061 0301;...
0107;LATIN SMALL LETTER C WITH ACUTE;...0;...0063 0301;...
0301;COMBINING ACUTE ACCENT;...230;...
0327;COMBINING CEDILLA;...202;...
Applying the canonical decomposition mappings, we get "a´c´¸" (a, acute, c, acute, cedilla).
This is because 00E1 (a-acute) has a canonical decomposition mapping to 0061 0301 (a, acute)
Applying the canonical ordering, we get "a´c¸´" (a, acute, c, cedilla, acute).
This is because cedilla has a lower combining class (202) than acute (230) does.
The positions of 'a' and 'c' are not affected, since they are starters.