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Diffstat (limited to 'pango2/break-indic.c')
| -rw-r--r-- | pango2/break-indic.c | 212 |
1 files changed, 212 insertions, 0 deletions
diff --git a/pango2/break-indic.c b/pango2/break-indic.c new file mode 100644 index 00000000..62ecdaab --- /dev/null +++ b/pango2/break-indic.c @@ -0,0 +1,212 @@ +/* Pango2 + * break-indic.c: + * + * Copyright (C) 2006 Red Hat Software + * Author: Akira TAGOH <tagoh@redhat.com> + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Library General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Library General Public License for more details. + * + * You should have received a copy of the GNU Library General Public + * License along with this library; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 02111-1307, USA. + */ + +#include "config.h" + +#include "pango-break.h" +#include "pango-item-private.h" + +#define DEV_RRA 0x0931 /* 0930 + 093c */ +#define DEV_QA 0x0958 /* 0915 + 093c */ +#define DEV_YA 0x095F /* 092f + 003c */ +#define DEV_KHHA 0x0959 +#define DEV_GHHA 0x095A +#define DEV_ZA 0x095B +#define DEV_DDDHA 0x095C +#define DEV_RHA 0x095D +#define DEV_FA 0x095E +#define DEV_YYA 0x095F + +/* Bengali */ +/* for split matras in all brahmi based script */ +#define BENGALI_SIGN_O 0x09CB /* 09c7 + 09be */ +#define BENGALI_SIGN_AU 0x09CC /* 09c7 + 09d7 */ +#define BENGALI_RRA 0x09DC +#define BENGALI_RHA 0x09DD +#define BENGALI_YYA 0x09DF + +/* Gurumukhi */ +#define GURUMUKHI_LLA 0x0A33 +#define GURUMUKHI_SHA 0x0A36 +#define GURUMUKHI_KHHA 0x0A59 +#define GURUMUKHI_GHHA 0x0A5A +#define GURUMUKHI_ZA 0x0A5B +#define GURUMUKHI_RRA 0x0A5C +#define GURUMUKHI_FA 0x0A5E + +/* Oriya */ +#define ORIYA_AI 0x0B48 +#define ORIYA_O 0x0B4B +#define ORIYA_AU 0x0B4C + +/* Telugu */ +#define TELUGU_EE 0x0C47 +#define TELUGU_AI 0x0C48 + +/* Tamil */ +#define TAMIL_O 0x0BCA +#define TAMIL_OO 0x0BCB +#define TAMIL_AU 0x0BCC + +/* Kannada */ +#define KNDA_EE 0x0CC7 +#define KNDA_AI 0x0CC8 +#define KNDA_O 0x0CCA +#define KNDA_OO 0x0CCB + +/* Malayalam */ +#define MLYM_O 0x0D4A +#define MLYM_OO 0x0D4B +#define MLYM_AU 0x0D4C + +#define IS_COMPOSITE_WITH_BRAHMI_NUKTA(c) ( \ + (c >= BENGALI_RRA && c <= BENGALI_YYA) || \ + (c >= DEV_QA && c <= DEV_YA) || (c == DEV_RRA) || (c >= DEV_KHHA && c <= DEV_YYA) || \ + (c >= KNDA_EE && c <= KNDA_AI) ||(c >= KNDA_O && c <= KNDA_OO) || \ + (c == TAMIL_O) || (c == TAMIL_OO) || (c == TAMIL_AU) || \ + (c == TELUGU_EE) || (c == TELUGU_AI) || \ + (c == ORIYA_AI) || (c == ORIYA_O) || (c == ORIYA_AU) || \ + (c >= GURUMUKHI_KHHA && c <= GURUMUKHI_RRA) || (c == GURUMUKHI_FA)|| (c == GURUMUKHI_LLA)|| (c == GURUMUKHI_SHA) || \ + FALSE) +#define IS_SPLIT_MATRA_BRAHMI(c) ( \ + (c == BENGALI_SIGN_O) || (c == BENGALI_SIGN_AU) || \ + (c >= MLYM_O && c <= MLYM_AU) || \ + FALSE) + +static void +not_cursor_position (Pango2LogAttr *attr) +{ + if (!attr->is_mandatory_break) + { + attr->is_cursor_position = FALSE; + attr->is_char_break = FALSE; + attr->is_line_break = FALSE; + attr->is_mandatory_break = FALSE; + } +} + +static void +break_indic (const char *text, + int length, + const Pango2Analysis *analysis, + Pango2LogAttr *attrs, + int attrs_len G_GNUC_UNUSED) +{ + const char *p, *next = NULL, *next_next; + gunichar prev_wc, this_wc, next_wc, next_next_wc; + gboolean is_conjunct = FALSE; + int i; + + for (p = text, prev_wc = 0, i = 0; + p != NULL && p < (text + length); + p = next, prev_wc = this_wc, i++) + { + this_wc = g_utf8_get_char (p); + next = g_utf8_next_char (p); + + if (G_UNLIKELY ( + IS_COMPOSITE_WITH_BRAHMI_NUKTA(this_wc) || IS_SPLIT_MATRA_BRAHMI(this_wc))) { + attrs[i+1].backspace_deletes_character = FALSE; + } + + if (next != NULL && next < (text + length)) + { + next_wc = g_utf8_get_char (next); + next_next = g_utf8_next_char (next); + } + else + { + next_wc = 0; + next_next = NULL; + } + if (next_next != NULL && next_next < (text + length)) + next_next_wc = g_utf8_get_char (next_next); + else + next_next_wc = 0; + + switch (analysis->script) + { + case G_UNICODE_SCRIPT_SINHALA: + /* + * TODO: The cursor position should be based on the state table. + * This is the wrong place to be doing this. + */ + + /* + * The cursor should treat as a single glyph: + * SINHALA CONS + 0x0DCA + 0x200D + SINHALA CONS + * SINHALA CONS + 0x200D + 0x0DCA + SINHALA CONS + */ + if ((this_wc == 0x0DCA && next_wc == 0x200D) + || (this_wc == 0x200D && next_wc == 0x0DCA)) + { + not_cursor_position(&attrs[i]); + not_cursor_position(&attrs[i + 1]); + is_conjunct = TRUE; + } + else if (is_conjunct + && (prev_wc == 0x200D || prev_wc == 0x0DCA) + && this_wc >= 0x0D9A + && this_wc <= 0x0DC6) + { + not_cursor_position(&attrs[i]); + is_conjunct = FALSE; + } + /* + * Consonant clusters do NOT result in implicit conjuncts + * in SINHALA orthography. + */ + else if (!is_conjunct && prev_wc == 0x0DCA && this_wc != 0x200D) + { + attrs[i].is_cursor_position = TRUE; + } + + break; + + default: + + if (prev_wc != 0 && (this_wc == 0x200D || this_wc == 0x200C)) + { + not_cursor_position(&attrs[i]); + if (next_wc != 0) + { + not_cursor_position(&attrs[i+1]); + if ((next_next_wc != 0) && + (next_wc == 0x09CD || /* Bengali */ + next_wc == 0x0ACD || /* Gujarati */ + next_wc == 0x094D || /* Hindi */ + next_wc == 0x0CCD || /* Kannada */ + next_wc == 0x0D4D || /* Malayalam */ + next_wc == 0x0B4D || /* Oriya */ + next_wc == 0x0A4D || /* Punjabi */ + next_wc == 0x0BCD || /* Tamil */ + next_wc == 0x0C4D)) /* Telugu */ + { + not_cursor_position(&attrs[i+2]); + } + } + } + + break; + } + } +} |