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Add g_unichar_iszerowidth(). (#347645)

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2007-01-03  Behdad Esfahbod  <behdad@gnome.org>

        * glib/glib.symbols:
        * glib/gunicode.h:
        * glib/guniprop.c: Add g_unichar_iszerowidth(). (#347645)


svn path=/trunk/; revision=5202
This commit is contained in:
Behdad Esfahbod
2007-01-03 20:48:24 +00:00
committed by Behdad Esfahbod
parent 048efdfbd5
commit a0c60a62d6
13 changed files with 98 additions and 30 deletions
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39
glib/guniprop.c
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@@ -85,6 +85,11 @@
OR (G_UNICODE_COMBINING_MARK, \
OR (G_UNICODE_ENCLOSING_MARK, 0))))
#define ISZEROWIDTHTYPE(Type) IS ((Type), \
OR (G_UNICODE_NON_SPACING_MARK, \
OR (G_UNICODE_ENCLOSING_MARK, \
OR (G_UNICODE_FORMAT, 0))))
/**
* g_unichar_isalnum:
* @c: a Unicode character
@@ -351,6 +356,40 @@ g_unichar_isdefined (gunichar c)
return TYPE (c) != G_UNICODE_UNASSIGNED;
}
/**
* g_unichar_iszerowidth:
* @c: a Unicode character
*
* Determines if a given character typically takes zero width when rendered.
* The return value is %TRUE for all non-spacing and enclosing marks
* (e.g., combining accents), format characters, zero-width
* space, but not U+00AD SOFT HYPHEN.
*
* A typical use of this function is with one of g_unichar_iswide() or
* g_unichar_iswide_cjk() to determine the number of cells a string occupies
* when displayed on a grid display (terminals). However, note that not all
* terminals support zero-width rendering of zero-width marks.
*
* Return value: %TRUE if the character has zero width
*
* Since: 2.14
**/
gboolean
g_unichar_iszerowidth (gunichar c)
{
if (G_UNLIKELY (c == 0x00AD))
return FALSE;
if (G_UNLIKELY (ISZEROWIDTHTYPE (c)))
return TRUE;
if (G_UNLIKELY ((c >= 0x1160 && c < 0x1200) ||
c == 0x200B))
return TRUE;
return FALSE;
}
/**
* g_unichar_iswide:
* @c: a Unicode character