diff options
Diffstat (limited to 'src/composite.c')
| -rw-r--r-- | src/composite.c | 152 |
1 files changed, 104 insertions, 48 deletions
diff --git a/src/composite.c b/src/composite.c index 8e5fce2da96..1ccd3af2515 100644 --- a/src/composite.c +++ b/src/composite.c @@ -4,6 +4,9 @@ Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006 National Institute of Advanced Industrial Science and Technology (AIST) Registration Number H14PRO021 + Copyright (C) 2003, 2006 + National Institute of Advanced Industrial Science and Technology (AIST) + Registration Number H13PRO009 This file is part of GNU Emacs. @@ -25,7 +28,7 @@ Boston, MA 02110-1301, USA. */ #include <config.h> #include "lisp.h" #include "buffer.h" -#include "charset.h" +#include "character.h" #include "intervals.h" /* Emacs uses special text property `composition' to support character @@ -147,19 +150,17 @@ Lisp_Object composition_hash_table; /* Function to call to adjust composition. */ Lisp_Object Vcompose_chars_after_function; -/* Char-table of patterns and functions to make a composition. */ -Lisp_Object Vcomposition_function_table; -Lisp_Object Qcomposition_function_table; +Lisp_Object Qauto_composed; +Lisp_Object Vauto_composition_function; +Lisp_Object Qauto_composition_function; + +EXFUN (Fremove_list_of_text_properties, 4); /* Temporary variable used in macros COMPOSITION_XXX. */ Lisp_Object composition_temp; - -/* Return how many columns C will occupy on the screen. It always - returns 1 for control characters and 8-bit characters because those - are just ignored in a composition. */ -#define CHAR_WIDTH(c) \ - (SINGLE_BYTE_CHAR_P (c) ? 1 : CHARSET_WIDTH (CHAR_CHARSET (c))) +extern int enable_font_backend; + /* Return COMPOSITION-ID of a composition at buffer position CHARPOS/BYTEPOS and length NCHARS. The `composition' property of the sequence is PROP. STRING, if non-nil, is a string that @@ -274,6 +275,22 @@ get_composition_id (charpos, bytepos, nchars, prop, string) /* Check if the contents of COMPONENTS are valid if COMPONENTS is a vector or a list. It should be a sequence of: char1 rule1 char2 rule2 char3 ... ruleN charN+1 */ + +#ifdef USE_FONT_BACKEND + if (enable_font_backend + && VECTORP (components) + && ASIZE (components) >= 2 + && VECTORP (AREF (components, 0))) + { + /* COMPONENTS is a glyph-string. */ + int len = ASIZE (key); + + for (i = 1; i < len; i++) + if (! VECTORP (AREF (key, i))) + goto invalid_composition; + } + else +#endif /* USE_FONT_BACKEND */ if (VECTORP (components) || CONSP (components)) { int len = XVECTOR (key)->size; @@ -307,6 +324,12 @@ get_composition_id (charpos, bytepos, nchars, prop, string) : ((INTEGERP (components) || STRINGP (components)) ? COMPOSITION_WITH_ALTCHARS : COMPOSITION_WITH_RULE_ALTCHARS)); +#ifdef USE_FONT_BACKEND + if (cmp->method == COMPOSITION_WITH_RULE_ALTCHARS + && VECTORP (components) + && ! INTEGERP (AREF (components, 0))) + cmp->method = COMPOSITION_WITH_GLYPH_STRING; +#endif /* USE_FONT_BACKEND */ cmp->hash_index = hash_index; glyph_len = (cmp->method == COMPOSITION_WITH_RULE_ALTCHARS ? (XVECTOR (key)->size + 1) / 2 @@ -315,6 +338,14 @@ get_composition_id (charpos, bytepos, nchars, prop, string) cmp->offsets = (short *) xmalloc (sizeof (short) * glyph_len * 2); cmp->font = NULL; +#ifdef USE_FONT_BACKEND + if (cmp->method == COMPOSITION_WITH_GLYPH_STRING) + { + cmp->width = 1; /* Should be fixed later. */ + cmp->glyph_len--; + } + else +#endif /* USE_FONT_BACKEND */ /* Calculate the width of overall glyphs of the composition. */ if (cmp->method != COMPOSITION_WITH_RULE_ALTCHARS) { @@ -335,17 +366,17 @@ get_composition_id (charpos, bytepos, nchars, prop, string) float leftmost = 0.0, rightmost; ch = XINT (key_contents[0]); - rightmost = CHAR_WIDTH (ch); + rightmost = ch != '\t' ? CHAR_WIDTH (ch) : 1; for (i = 1; i < glyph_len; i += 2) { - int rule, gref, nref; + int rule, gref, nref, xoff, yoff; int this_width; float this_left; rule = XINT (key_contents[i]); ch = XINT (key_contents[i + 1]); - this_width = CHAR_WIDTH (ch); + this_width = ch != '\t' ? CHAR_WIDTH (ch) : 1; /* A composition rule is specified by an integer value that encodes global and new reference points (GREF and @@ -361,7 +392,7 @@ get_composition_id (charpos, bytepos, nchars, prop, string) | | 6---7---8 -- descent */ - COMPOSITION_DECODE_RULE (rule, gref, nref); + COMPOSITION_DECODE_RULE (rule, gref, nref, xoff, yoff); this_left = (leftmost + (gref % 3) * (rightmost - leftmost) / 2.0 - (nref % 3) * this_width / 2.0); @@ -407,7 +438,8 @@ get_composition_id (charpos, bytepos, nchars, prop, string) int find_composition (pos, limit, start, end, prop, object) - int pos, limit, *start, *end; + int pos, limit; + EMACS_INT *start, *end; Lisp_Object *prop, object; { Lisp_Object val; @@ -451,7 +483,7 @@ run_composition_function (from, to, prop) Lisp_Object prop; { Lisp_Object func; - int start, end; + EMACS_INT start, end; func = COMPOSITION_MODIFICATION_FUNC (prop); /* If an invalid composition precedes or follows, try to make them @@ -466,24 +498,29 @@ run_composition_function (from, to, prop) to = end; if (!NILP (Ffboundp (func))) call2 (func, make_number (from), make_number (to)); - else if (!NILP (Ffboundp (Vcompose_chars_after_function))) - call3 (Vcompose_chars_after_function, - make_number (from), make_number (to), Qnil); } /* Make invalid compositions adjacent to or inside FROM and TO valid. CHECK_MASK is bitwise `or' of mask bits defined by macros CHECK_XXX (see the comment in composite.h). + It also resets the text-property `auto-composed' to a proper region + so that automatic character composition works correctly later while + displaying the region. + This function is called when a buffer text is changed. If the change is deletion, FROM == TO. Otherwise, FROM < TO. */ void update_compositions (from, to, check_mask) - int from, to, check_mask; + EMACS_INT from, to; + int check_mask; { Lisp_Object prop; - int start, end; + EMACS_INT start, end; + /* The beginning and end of the region to set the property + `auto-composed' to nil. */ + EMACS_INT min_pos = from, max_pos = to; if (inhibit_modification_hooks) return; @@ -502,6 +539,9 @@ update_compositions (from, to, check_mask) if (from > BEGV && find_composition (from - 1, -1, &start, &end, &prop, Qnil)) { + min_pos = start; + if (end > to) + max_pos = end; if (from < end) Fput_text_property (make_number (from), make_number (end), Qcomposition, @@ -511,7 +551,11 @@ update_compositions (from, to, check_mask) } else if (from < ZV && find_composition (from, -1, &start, &from, &prop, Qnil)) - run_composition_function (start, from, prop); + { + if (from > to) + max_pos = from; + run_composition_function (start, from, prop); + } } if (check_mask & CHECK_INSIDE) @@ -536,14 +580,32 @@ update_compositions (from, to, check_mask) To avoid it, in such a case, we change the property of the former to the copy of it. */ if (to < end) - Fput_text_property (make_number (start), make_number (to), - Qcomposition, - Fcons (XCAR (prop), XCDR (prop)), Qnil); + { + Fput_text_property (make_number (start), make_number (to), + Qcomposition, + Fcons (XCAR (prop), XCDR (prop)), Qnil); + max_pos = end; + } run_composition_function (start, end, prop); } else if (to < ZV && find_composition (to, -1, &start, &end, &prop, Qnil)) - run_composition_function (start, end, prop); + { + run_composition_function (start, end, prop); + max_pos = end; + } + } + if (min_pos < max_pos) + { + int count = SPECPDL_INDEX (); + + specbind (Qinhibit_read_only, Qt); + specbind (Qinhibit_modification_hooks, Qt); + specbind (Qinhibit_point_motion_hooks, Qt); + Fremove_list_of_text_properties (make_number (min_pos), + make_number (max_pos), + Fcons (Qauto_composed, Qnil), Qnil); + unbind_to (count, Qnil); } } @@ -590,7 +652,6 @@ compose_text (start, end, components, modification_func, string) Fput_text_property (make_number (start), make_number (end), Qcomposition, prop, string); } - /* Emacs Lisp APIs. */ @@ -648,7 +709,7 @@ See `find-composition' for more detail. */) Lisp_Object pos, limit, string, detail_p; { Lisp_Object prop, tail; - int start, end; + EMACS_INT start, end; int id; CHECK_NUMBER_COERCE_MARKER (pos); @@ -727,12 +788,12 @@ syms_of_composite () args[0] = QCtest; args[1] = Qequal; + args[2] = QCweakness; /* We used to make the hash table weak so that unreferenced compostions can be garbage-collected. But, usually once created compositions are repeatedly used in an Emacs session, and thus it's not worth to save memory in such a way. So, we make the table not weak. */ - args[2] = QCweakness; args[3] = Qnil; args[4] = QCsize; args[5] = make_number (311); @@ -758,29 +819,24 @@ valid. The default value is the function `compose-chars-after'. */); Vcompose_chars_after_function = intern ("compose-chars-after"); - Qcomposition_function_table = intern ("composition-function-table"); - staticpro (&Qcomposition_function_table); - - /* Intern this now in case it isn't already done. - Setting this variable twice is harmless. - But don't staticpro it here--that is done in alloc.c. */ - Qchar_table_extra_slots = intern ("char-table-extra-slots"); + Qauto_composed = intern ("auto-composed"); + staticpro (&Qauto_composed); - Fput (Qcomposition_function_table, Qchar_table_extra_slots, make_number (0)); + Qauto_composition_function = intern ("auto-composition-function"); + staticpro (&Qauto_composition_function); - DEFVAR_LISP ("composition-function-table", &Vcomposition_function_table, - doc: /* Char table of patterns and functions to make a composition. + DEFVAR_LISP ("auto-composition-function", &Vauto_composition_function, + doc: /* Function to call to compose characters automatically. +The function is called from the display routine with two arguments, +POS and STRING. -Each element is nil or an alist of PATTERNs vs FUNCs, where PATTERNs -are regular expressions and FUNCs are functions. FUNC is responsible -for composing text matching the corresponding PATTERN. FUNC is called -with three arguments FROM, TO, and PATTERN. See the function -`compose-chars-after' for more detail. +If STRING is nil, the function must compose characters following POS +in the current buffer. -This table is looked up by the first character of a composition when -the composition gets invalid after a change in a buffer. */); - Vcomposition_function_table - = Fmake_char_table (Qcomposition_function_table, Qnil); +Otherwise, STRING is a string, and POS is an index to the string. In +this case, the function must compose characters following POS in +the string. */); + Vauto_composition_function = Qnil; defsubr (&Scompose_region_internal); defsubr (&Scompose_string_internal); |