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+/*
+ * Copyright © 2009 Red Hat, Inc.
+ * Copyright © 2011 Codethink Limited
+ * Copyright © 2010,2011,2012 Google, Inc.
+ *
+ * This is part of HarfBuzz, a text shaping library.
+ *
+ * Permission is hereby granted, without written agreement and without
+ * license or royalty fees, to use, copy, modify, and distribute this
+ * software and its documentation for any purpose, provided that the
+ * above copyright notice and the following two paragraphs appear in
+ * all copies of this software.
+ *
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
+ * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
+ * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * Red Hat Author(s): Behdad Esfahbod
+ * Codethink Author(s): Ryan Lortie
+ * Google Author(s): Behdad Esfahbod
+ */
+
+#include "hb.hh"
+
+#include "hb-unicode.hh"
+
+
+/**
+ * SECTION: hb-unicode
+ * @title: hb-unicode
+ * @short_description: Unicode character property access
+ * @include: hb.h
+ *
+ * Unicode functions are used to access Unicode character properties.
+ * With these functions, client programs can query various properties from
+ * the Unicode Character Database for any code point, such as General
+ * Category (gc), Script (sc), Canonical Combining Class (ccc), etc.
+ *
+ * Client programs can optionally pass in their own Unicode functions
+ * that implement the same queries. The set of functions available is
+ * defined by the virtual methods in #hb_unicode_funcs_t.
+ *
+ * HarfBuzz provides built-in default functions for each method in
+ * #hb_unicode_funcs_t.
+ **/
+
+
+/*
+ * hb_unicode_funcs_t
+ */
+
+static hb_unicode_combining_class_t
+hb_unicode_combining_class_nil (hb_unicode_funcs_t *ufuncs HB_UNUSED,
+ hb_codepoint_t unicode HB_UNUSED,
+ void *user_data HB_UNUSED)
+{
+ return HB_UNICODE_COMBINING_CLASS_NOT_REORDERED;
+}
+
+#ifndef HB_DISABLE_DEPRECATED
+static unsigned int
+hb_unicode_eastasian_width_nil (hb_unicode_funcs_t *ufuncs HB_UNUSED,
+ hb_codepoint_t unicode HB_UNUSED,
+ void *user_data HB_UNUSED)
+{
+ return 1;
+}
+#endif
+
+static hb_unicode_general_category_t
+hb_unicode_general_category_nil (hb_unicode_funcs_t *ufuncs HB_UNUSED,
+ hb_codepoint_t unicode HB_UNUSED,
+ void *user_data HB_UNUSED)
+{
+ return HB_UNICODE_GENERAL_CATEGORY_OTHER_LETTER;
+}
+
+static hb_codepoint_t
+hb_unicode_mirroring_nil (hb_unicode_funcs_t *ufuncs HB_UNUSED,
+ hb_codepoint_t unicode,
+ void *user_data HB_UNUSED)
+{
+ return unicode;
+}
+
+static hb_script_t
+hb_unicode_script_nil (hb_unicode_funcs_t *ufuncs HB_UNUSED,
+ hb_codepoint_t unicode HB_UNUSED,
+ void *user_data HB_UNUSED)
+{
+ return HB_SCRIPT_UNKNOWN;
+}
+
+static hb_bool_t
+hb_unicode_compose_nil (hb_unicode_funcs_t *ufuncs HB_UNUSED,
+ hb_codepoint_t a HB_UNUSED,
+ hb_codepoint_t b HB_UNUSED,
+ hb_codepoint_t *ab HB_UNUSED,
+ void *user_data HB_UNUSED)
+{
+ return false;
+}
+
+static hb_bool_t
+hb_unicode_decompose_nil (hb_unicode_funcs_t *ufuncs HB_UNUSED,
+ hb_codepoint_t ab HB_UNUSED,
+ hb_codepoint_t *a HB_UNUSED,
+ hb_codepoint_t *b HB_UNUSED,
+ void *user_data HB_UNUSED)
+{
+ return false;
+}
+
+
+#ifndef HB_DISABLE_DEPRECATED
+static unsigned int
+hb_unicode_decompose_compatibility_nil (hb_unicode_funcs_t *ufuncs HB_UNUSED,
+ hb_codepoint_t u HB_UNUSED,
+ hb_codepoint_t *decomposed HB_UNUSED,
+ void *user_data HB_UNUSED)
+{
+ return 0;
+}
+#endif
+
+#if !defined(HB_NO_UNICODE_FUNCS) && defined(HAVE_GLIB)
+#include "hb-glib.h"
+#endif
+#if !defined(HB_NO_UNICODE_FUNCS) && defined(HAVE_ICU) && defined(HAVE_ICU_BUILTIN)
+#include "hb-icu.h"
+#endif
+
+/**
+ * hb_unicode_funcs_get_default:
+ *
+ * Fetches a pointer to the default Unicode-functions structure that is used
+ * when no functions are explicitly set on #hb_buffer_t.
+ *
+ * Return value: (transfer none): a pointer to the #hb_unicode_funcs_t Unicode-functions structure
+ *
+ * Since: 0.9.2
+ **/
+hb_unicode_funcs_t *
+hb_unicode_funcs_get_default ()
+{
+#if !defined(HB_NO_UNICODE_FUNCS) && !defined(HB_NO_UCD)
+ return hb_ucd_get_unicode_funcs ();
+#elif !defined(HB_NO_UNICODE_FUNCS) && defined(HAVE_GLIB)
+ return hb_glib_get_unicode_funcs ();
+#elif !defined(HB_NO_UNICODE_FUNCS) && defined(HAVE_ICU) && defined(HAVE_ICU_BUILTIN)
+ return hb_icu_get_unicode_funcs ();
+#else
+#define HB_UNICODE_FUNCS_NIL 1
+ return hb_unicode_funcs_get_empty ();
+#endif
+}
+
+#if !defined(HB_NO_UNICODE_FUNCS) && defined(HB_UNICODE_FUNCS_NIL)
+#error "Could not find any Unicode functions implementation, you have to provide your own"
+#error "Consider building hb-ucd.cc. If you absolutely want to build without any, check the code."
+#endif
+
+/**
+ * hb_unicode_funcs_create: (Xconstructor)
+ * @parent: (nullable): Parent Unicode-functions structure
+ *
+ * Creates a new #hb_unicode_funcs_t structure of Unicode functions.
+ *
+ * Return value: (transfer full): The Unicode-functions structure
+ *
+ * Since: 0.9.2
+ **/
+hb_unicode_funcs_t *
+hb_unicode_funcs_create (hb_unicode_funcs_t *parent)
+{
+ hb_unicode_funcs_t *ufuncs;
+
+ if (!(ufuncs = hb_object_create<hb_unicode_funcs_t> ()))
+ return hb_unicode_funcs_get_empty ();
+
+ if (!parent)
+ parent = hb_unicode_funcs_get_empty ();
+
+ hb_unicode_funcs_make_immutable (parent);
+ ufuncs->parent = hb_unicode_funcs_reference (parent);
+
+ ufuncs->func = parent->func;
+
+ /* We can safely copy user_data from parent since we hold a reference
+ * onto it and it's immutable. We should not copy the destroy notifiers
+ * though. */
+ ufuncs->user_data = parent->user_data;
+
+ return ufuncs;
+}
+
+
+DEFINE_NULL_INSTANCE (hb_unicode_funcs_t) =
+{
+ HB_OBJECT_HEADER_STATIC,
+
+ nullptr, /* parent */
+ {
+#define HB_UNICODE_FUNC_IMPLEMENT(name) hb_unicode_##name##_nil,
+ HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS
+#undef HB_UNICODE_FUNC_IMPLEMENT
+ }
+};
+
+/**
+ * hb_unicode_funcs_get_empty:
+ *
+ * Fetches the singleton empty Unicode-functions structure.
+ *
+ * Return value: (transfer full): The empty Unicode-functions structure
+ *
+ * Since: 0.9.2
+ **/
+hb_unicode_funcs_t *
+hb_unicode_funcs_get_empty ()
+{
+ return const_cast<hb_unicode_funcs_t *> (&Null (hb_unicode_funcs_t));
+}
+
+/**
+ * hb_unicode_funcs_reference: (skip)
+ * @ufuncs: The Unicode-functions structure
+ *
+ * Increases the reference count on a Unicode-functions structure.
+ *
+ * Return value: (transfer full): The Unicode-functions structure
+ *
+ * Since: 0.9.2
+ **/
+hb_unicode_funcs_t *
+hb_unicode_funcs_reference (hb_unicode_funcs_t *ufuncs)
+{
+ return hb_object_reference (ufuncs);
+}
+
+/**
+ * hb_unicode_funcs_destroy: (skip)
+ * @ufuncs: The Unicode-functions structure
+ *
+ * Decreases the reference count on a Unicode-functions structure. When
+ * the reference count reaches zero, the Unicode-functions structure is
+ * destroyed, freeing all memory.
+ *
+ * Since: 0.9.2
+ **/
+void
+hb_unicode_funcs_destroy (hb_unicode_funcs_t *ufuncs)
+{
+ if (!hb_object_destroy (ufuncs)) return;
+
+#define HB_UNICODE_FUNC_IMPLEMENT(name) \
+ if (ufuncs->destroy.name) ufuncs->destroy.name (ufuncs->user_data.name);
+ HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS
+#undef HB_UNICODE_FUNC_IMPLEMENT
+
+ hb_unicode_funcs_destroy (ufuncs->parent);
+
+ free (ufuncs);
+}
+
+/**
+ * hb_unicode_funcs_set_user_data: (skip)
+ * @ufuncs: The Unicode-functions structure
+ * @key: The user-data key
+ * @data: A pointer to the user data
+ * @destroy: (optional): A callback to call when @data is not needed anymore
+ * @replace: Whether to replace an existing data with the same key
+ *
+ * Attaches a user-data key/data pair to the specified Unicode-functions structure.
+ *
+ * Return value: %true if success, %false otherwise
+ *
+ * Since: 0.9.2
+ **/
+hb_bool_t
+hb_unicode_funcs_set_user_data (hb_unicode_funcs_t *ufuncs,
+ hb_user_data_key_t *key,
+ void * data,
+ hb_destroy_func_t destroy,
+ hb_bool_t replace)
+{
+ return hb_object_set_user_data (ufuncs, key, data, destroy, replace);
+}
+
+/**
+ * hb_unicode_funcs_get_user_data: (skip)
+ * @ufuncs: The Unicode-functions structure
+ * @key: The user-data key to query
+ *
+ * Fetches the user-data associated with the specified key,
+ * attached to the specified Unicode-functions structure.
+ *
+ * Return value: (transfer none): A pointer to the user data
+ *
+ * Since: 0.9.2
+ **/
+void *
+hb_unicode_funcs_get_user_data (hb_unicode_funcs_t *ufuncs,
+ hb_user_data_key_t *key)
+{
+ return hb_object_get_user_data (ufuncs, key);
+}
+
+
+/**
+ * hb_unicode_funcs_make_immutable:
+ * @ufuncs: The Unicode-functions structure
+ *
+ * Makes the specified Unicode-functions structure
+ * immutable.
+ *
+ * Since: 0.9.2
+ **/
+void
+hb_unicode_funcs_make_immutable (hb_unicode_funcs_t *ufuncs)
+{
+ if (hb_object_is_immutable (ufuncs))
+ return;
+
+ hb_object_make_immutable (ufuncs);
+}
+
+/**
+ * hb_unicode_funcs_is_immutable:
+ * @ufuncs: The Unicode-functions structure
+ *
+ * Tests whether the specified Unicode-functions structure
+ * is immutable.
+ *
+ * Return value: %true if @ufuncs is immutable, false otherwise
+ *
+ * Since: 0.9.2
+ **/
+hb_bool_t
+hb_unicode_funcs_is_immutable (hb_unicode_funcs_t *ufuncs)
+{
+ return hb_object_is_immutable (ufuncs);
+}
+
+/**
+ * hb_unicode_funcs_get_parent:
+ * @ufuncs: The Unicode-functions structure
+ *
+ * Fetches the parent of the Unicode-functions structure
+ * @ufuncs.
+ *
+ * Return value: The parent Unicode-functions structure
+ *
+ * Since: 0.9.2
+ **/
+hb_unicode_funcs_t *
+hb_unicode_funcs_get_parent (hb_unicode_funcs_t *ufuncs)
+{
+ return ufuncs->parent ? ufuncs->parent : hb_unicode_funcs_get_empty ();
+}
+
+
+#define HB_UNICODE_FUNC_IMPLEMENT(name) \
+ \
+void \
+hb_unicode_funcs_set_##name##_func (hb_unicode_funcs_t *ufuncs, \
+ hb_unicode_##name##_func_t func, \
+ void *user_data, \
+ hb_destroy_func_t destroy) \
+{ \
+ if (hb_object_is_immutable (ufuncs)) \
+ return; \
+ \
+ if (ufuncs->destroy.name) \
+ ufuncs->destroy.name (ufuncs->user_data.name); \
+ \
+ if (func) { \
+ ufuncs->func.name = func; \
+ ufuncs->user_data.name = user_data; \
+ ufuncs->destroy.name = destroy; \
+ } else { \
+ ufuncs->func.name = ufuncs->parent->func.name; \
+ ufuncs->user_data.name = ufuncs->parent->user_data.name; \
+ ufuncs->destroy.name = nullptr; \
+ } \
+}
+
+HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS
+#undef HB_UNICODE_FUNC_IMPLEMENT
+
+
+#define HB_UNICODE_FUNC_IMPLEMENT(return_type, name) \
+ \
+return_type \
+hb_unicode_##name (hb_unicode_funcs_t *ufuncs, \
+ hb_codepoint_t unicode) \
+{ \
+ return ufuncs->name (unicode); \
+}
+HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS_SIMPLE
+#undef HB_UNICODE_FUNC_IMPLEMENT
+
+/**
+ * hb_unicode_compose:
+ * @ufuncs: The Unicode-functions structure
+ * @a: The first Unicode code point to compose
+ * @b: The second Unicode code point to compose
+ * @ab: (out): The composition of @a, @b
+ *
+ * Fetches the composition of a sequence of two Unicode
+ * code points.
+ *
+ * Calls the composition function of the specified
+ * Unicode-functions structure @ufuncs.
+ *
+ * Return value: %true if @a and @b composed, false otherwise
+ *
+ * Since: 0.9.2
+ **/
+hb_bool_t
+hb_unicode_compose (hb_unicode_funcs_t *ufuncs,
+ hb_codepoint_t a,
+ hb_codepoint_t b,
+ hb_codepoint_t *ab)
+{
+ return ufuncs->compose (a, b, ab);
+}
+
+/**
+ * hb_unicode_decompose:
+ * @ufuncs: The Unicode-functions structure
+ * @ab: Unicode code point to decompose
+ * @a: (out): The first code point of the decomposition of @ab
+ * @b: (out): The second code point of the decomposition of @ab
+ *
+ * Fetches the decomposition of a Unicode code point.
+ *
+ * Calls the decomposition function of the specified
+ * Unicode-functions structure @ufuncs.
+ *
+ * Return value: %true if @ab was decomposed, false otherwise
+ *
+ * Since: 0.9.2
+ **/
+hb_bool_t
+hb_unicode_decompose (hb_unicode_funcs_t *ufuncs,
+ hb_codepoint_t ab,
+ hb_codepoint_t *a,
+ hb_codepoint_t *b)
+{
+ return ufuncs->decompose (ab, a, b);
+}
+
+#ifndef HB_DISABLE_DEPRECATED
+/**
+ * hb_unicode_decompose_compatibility:
+ * @ufuncs: The Unicode-functions structure
+ * @u: Code point to decompose
+ * @decomposed: (out): Compatibility decomposition of @u
+ *
+ * Fetches the compatibility decomposition of a Unicode
+ * code point. Deprecated.
+ *
+ * Return value:
+ *
+ * Since: 0.9.2
+ * Deprecated: 2.0.0
+ **/
+unsigned int
+hb_unicode_decompose_compatibility (hb_unicode_funcs_t *ufuncs,
+ hb_codepoint_t u,
+ hb_codepoint_t *decomposed)
+{
+ return ufuncs->decompose_compatibility (u, decomposed);
+}
+#endif
+
+
+#ifndef HB_NO_OT_SHAPE
+/* See hb-unicode.hh for details. */
+const uint8_t
+_hb_modified_combining_class[256] =
+{
+ 0, /* HB_UNICODE_COMBINING_CLASS_NOT_REORDERED */
+ 1, /* HB_UNICODE_COMBINING_CLASS_OVERLAY */
+ 2, 3, 4, 5, 6,
+ 7, /* HB_UNICODE_COMBINING_CLASS_NUKTA */
+ 8, /* HB_UNICODE_COMBINING_CLASS_KANA_VOICING */
+ 9, /* HB_UNICODE_COMBINING_CLASS_VIRAMA */
+
+ /* Hebrew */
+ HB_MODIFIED_COMBINING_CLASS_CCC10,
+ HB_MODIFIED_COMBINING_CLASS_CCC11,
+ HB_MODIFIED_COMBINING_CLASS_CCC12,
+ HB_MODIFIED_COMBINING_CLASS_CCC13,
+ HB_MODIFIED_COMBINING_CLASS_CCC14,
+ HB_MODIFIED_COMBINING_CLASS_CCC15,
+ HB_MODIFIED_COMBINING_CLASS_CCC16,
+ HB_MODIFIED_COMBINING_CLASS_CCC17,
+ HB_MODIFIED_COMBINING_CLASS_CCC18,
+ HB_MODIFIED_COMBINING_CLASS_CCC19,
+ HB_MODIFIED_COMBINING_CLASS_CCC20,
+ HB_MODIFIED_COMBINING_CLASS_CCC21,
+ HB_MODIFIED_COMBINING_CLASS_CCC22,
+ HB_MODIFIED_COMBINING_CLASS_CCC23,
+ HB_MODIFIED_COMBINING_CLASS_CCC24,
+ HB_MODIFIED_COMBINING_CLASS_CCC25,
+ HB_MODIFIED_COMBINING_CLASS_CCC26,
+
+ /* Arabic */
+ HB_MODIFIED_COMBINING_CLASS_CCC27,
+ HB_MODIFIED_COMBINING_CLASS_CCC28,
+ HB_MODIFIED_COMBINING_CLASS_CCC29,
+ HB_MODIFIED_COMBINING_CLASS_CCC30,
+ HB_MODIFIED_COMBINING_CLASS_CCC31,
+ HB_MODIFIED_COMBINING_CLASS_CCC32,
+ HB_MODIFIED_COMBINING_CLASS_CCC33,
+ HB_MODIFIED_COMBINING_CLASS_CCC34,
+ HB_MODIFIED_COMBINING_CLASS_CCC35,
+
+ /* Syriac */
+ HB_MODIFIED_COMBINING_CLASS_CCC36,
+
+ 37, 38, 39,
+ 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59,
+ 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
+ 80, 81, 82, 83,
+
+ /* Telugu */
+ HB_MODIFIED_COMBINING_CLASS_CCC84,
+ 85, 86, 87, 88, 89, 90,
+ HB_MODIFIED_COMBINING_CLASS_CCC91,
+ 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102,
+
+ /* Thai */
+ HB_MODIFIED_COMBINING_CLASS_CCC103,
+ 104, 105, 106,
+ HB_MODIFIED_COMBINING_CLASS_CCC107,
+ 108, 109, 110, 111, 112, 113, 114, 115, 116, 117,
+
+ /* Lao */
+ HB_MODIFIED_COMBINING_CLASS_CCC118,
+ 119, 120, 121,
+ HB_MODIFIED_COMBINING_CLASS_CCC122,
+ 123, 124, 125, 126, 127, 128,
+
+ /* Tibetan */
+ HB_MODIFIED_COMBINING_CLASS_CCC129,
+ HB_MODIFIED_COMBINING_CLASS_CCC130,
+ 131,
+ HB_MODIFIED_COMBINING_CLASS_CCC132,
+ 133, 134, 135, 136, 137, 138, 139,
+
+
+ 140, 141, 142, 143, 144, 145, 146, 147, 148, 149,
+ 150, 151, 152, 153, 154, 155, 156, 157, 158, 159,
+ 160, 161, 162, 163, 164, 165, 166, 167, 168, 169,
+ 170, 171, 172, 173, 174, 175, 176, 177, 178, 179,
+ 180, 181, 182, 183, 184, 185, 186, 187, 188, 189,
+ 190, 191, 192, 193, 194, 195, 196, 197, 198, 199,
+
+ 200, /* HB_UNICODE_COMBINING_CLASS_ATTACHED_BELOW_LEFT */
+ 201,
+ 202, /* HB_UNICODE_COMBINING_CLASS_ATTACHED_BELOW */
+ 203, 204, 205, 206, 207, 208, 209, 210, 211, 212, 213,
+ 214, /* HB_UNICODE_COMBINING_CLASS_ATTACHED_ABOVE */
+ 215,
+ 216, /* HB_UNICODE_COMBINING_CLASS_ATTACHED_ABOVE_RIGHT */
+ 217,
+ 218, /* HB_UNICODE_COMBINING_CLASS_BELOW_LEFT */
+ 219,
+ 220, /* HB_UNICODE_COMBINING_CLASS_BELOW */
+ 221,
+ 222, /* HB_UNICODE_COMBINING_CLASS_BELOW_RIGHT */
+ 223,
+ 224, /* HB_UNICODE_COMBINING_CLASS_LEFT */
+ 225,
+ 226, /* HB_UNICODE_COMBINING_CLASS_RIGHT */
+ 227,
+ 228, /* HB_UNICODE_COMBINING_CLASS_ABOVE_LEFT */
+ 229,
+ 230, /* HB_UNICODE_COMBINING_CLASS_ABOVE */
+ 231,
+ 232, /* HB_UNICODE_COMBINING_CLASS_ABOVE_RIGHT */
+ 233, /* HB_UNICODE_COMBINING_CLASS_DOUBLE_BELOW */
+ 234, /* HB_UNICODE_COMBINING_CLASS_DOUBLE_ABOVE */
+ 235, 236, 237, 238, 239,
+ 240, /* HB_UNICODE_COMBINING_CLASS_IOTA_SUBSCRIPT */
+ 241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254,
+ 255, /* HB_UNICODE_COMBINING_CLASS_INVALID */
+};
+#endif
+
+
+/*
+ * Emoji
+ */
+#ifndef HB_NO_EMOJI_SEQUENCES
+
+#include "hb-unicode-emoji-table.hh"
+
+bool
+_hb_unicode_is_emoji_Extended_Pictographic (hb_codepoint_t cp)
+{
+ return _hb_emoji_is_Extended_Pictographic (cp);
+}
+#endif
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