Remove unused harfbuzz.

third_party/harfbuzz/contrib/harfbuzz-unicode.c

-#include <stdint.h>
-#include <stdlib.h>
-
-#include <harfbuzz-external.h>
-#include <harfbuzz-impl.h>
-#include <harfbuzz-shaper.h>
-#include "harfbuzz-unicode.h"
-
-#include "tables/grapheme-break-properties.h"
-#include "tables/mirroring-properties.h"
-#include "tables/script-properties.h"
-
-uint32_t
-utf16_to_code_point(const uint16_t *chars, size_t len, ssize_t *iter) {
-  const uint16_t v = chars[(*iter)++];
-  if (HB_IsHighSurrogate(v)) {
-    // surrogate pair
-    if (*iter >= len) {
-      // the surrogate is incomplete.
-      return HB_InvalidCodePoint;
-    }
-    const uint16_t v2 = chars[(*iter)++];
-    if (!HB_IsLowSurrogate(v2)) {
-      // invalidate surrogate pair.
-      return HB_InvalidCodePoint;
-    }
-
-    return HB_SurrogateToUcs4(v, v2);
-  }
-
-  if (HB_IsLowSurrogate(v)) {
-    // this isn't a valid code point
-    return HB_InvalidCodePoint;
-  }
-
-  return v;
-}
-
-uint32_t
-utf16_to_code_point_prev(const uint16_t *chars, size_t len, ssize_t *iter) {
-  const uint16_t v = chars[(*iter)--];
-  if (HB_IsLowSurrogate(v)) {
-    // surrogate pair
-    if (*iter < 0) {
-      // the surrogate is incomplete.
-      return HB_InvalidCodePoint;
-    }
-    const uint16_t v2 = chars[(*iter)--];
-    if (!HB_IsHighSurrogate(v2)) {
-      // invalidate surrogate pair.
-      return HB_InvalidCodePoint;
-    }
-
-    return HB_SurrogateToUcs4(v2, v);
-  }
-
-  if (HB_IsHighSurrogate(v)) {
-    // this isn't a valid code point
-    return HB_InvalidCodePoint;
-  }
-
-  return v;
-}
-
-static int
-script_property_cmp(const void *vkey, const void *vcandidate) {
-  const uint32_t key = (uint32_t) (intptr_t) vkey;
-  const struct script_property *candidate = vcandidate;
-
-  if (key < candidate->range_start) {
-    return -1;
-  } else if (key > candidate->range_end) {
-    return 1;
-  } else {
-    return 0;
-  }
-}
-
-HB_Script
-code_point_to_script(uint32_t cp) {
-  const void *vprop = bsearch((void *) (intptr_t) cp, script_properties,
-                              script_properties_count,
-                              sizeof(struct script_property),
-                              script_property_cmp);
-  if (!vprop)
-    return HB_Script_Common;
-
-  return ((const struct script_property *) vprop)->script;
-}
-
-char
-hb_utf16_script_run_next(unsigned *num_code_points, HB_ScriptItem *output,
-                         const uint16_t *chars, size_t len, ssize_t *iter) {
-  if (*iter == len)
-    return 0;
-
-  output->pos = *iter;
-  const uint32_t init_cp = utf16_to_code_point(chars, len, iter);
-  unsigned cps = 1;
-  if (init_cp == HB_InvalidCodePoint)
-    return 0;
-  const HB_Script init_script = code_point_to_script(init_cp);
-  HB_Script current_script = init_script;
-  output->script = init_script;
-
-  for (;;) {
-    if (*iter == len)
-      break;
-    const ssize_t prev_iter = *iter;
-    const uint32_t cp = utf16_to_code_point(chars, len, iter);
-    if (cp == HB_InvalidCodePoint)
-      return 0;
-    cps++;
-    const HB_Script script = code_point_to_script(cp);
-
-    if (script != current_script) {
-      if (current_script == HB_Script_Inherited && init_script == HB_Script_Inherited) {
-        // If we started off as inherited, we take whatever we can find.
-        output->script = script;
-        current_script = script;
-        continue;
-      } else if (script == HB_Script_Inherited) {
-        continue;
-      } else {
-        *iter = prev_iter;
-        cps--;
-        break;
-      }
-    }
-  }
-
-  if (output->script == HB_Script_Inherited)
-    output->script = HB_Script_Common;
-
-  output->length = *iter - output->pos;
-  if (num_code_points)
-    *num_code_points = cps;
-  return 1;
-}
-
-char
-hb_utf16_script_run_prev(unsigned *num_code_points, HB_ScriptItem *output,
-                         const uint16_t *chars, size_t len, ssize_t *iter) {
-  if (*iter == (size_t) -1)
-    return 0;
-
-  const size_t ending_index = *iter;
-  const uint32_t init_cp = utf16_to_code_point_prev(chars, len, iter);
-  unsigned cps = 1;
-  if (init_cp == HB_InvalidCodePoint)
-    return 0;
-  const HB_Script init_script = code_point_to_script(init_cp);
-  HB_Script current_script = init_script;
-  output->script = init_script;
-
-  for (;;) {
-    if (*iter < 0)
-      break;
-    const ssize_t prev_iter = *iter;
-    const uint32_t cp = utf16_to_code_point_prev(chars, len, iter);
-    if (cp == HB_InvalidCodePoint)
-      return 0;
-    cps++;
-    const HB_Script script = code_point_to_script(cp);
-
-    if (script != current_script) {
-      if (current_script == init_script == HB_Script_Inherited) {
-        // If we started off as inherited, we take whatever we can find.
-        output->script = script;
-        current_script = script;
-        continue;
-      } else if (script == HB_Script_Inherited) {
-        // Just assume that whatever follows this combining character is within
-        // the same script.  This is incorrect if you had language1 + combining
-        // char + language 2, but that is rare and this code is suspicious
-        // anyway.
-        continue;
-      } else {
-        *iter = prev_iter;
-        cps--;
-        break;
-      }
-    }
-  }
-
-  if (output->script == HB_Script_Inherited)
-    output->script = HB_Script_Common;
-
-  output->pos = *iter + 1;
-  output->length = ending_index - *iter;
-  if (num_code_points)
-    *num_code_points = cps;
-  return 1;
-}
-
-static int
-grapheme_break_property_cmp(const void *vkey, const void *vcandidate) {
-  const uint32_t key = (uint32_t) (intptr_t) vkey;
-  const struct grapheme_break_property *candidate = vcandidate;
-
-  if (key < candidate->range_start) {
-    return -1;
-  } else if (key > candidate->range_end) {
-    return 1;
-  } else {
-    return 0;
-  }
-}
-
-HB_GraphemeClass
-HB_GetGraphemeClass(HB_UChar32 ch) {
-  const void *vprop = bsearch((void *) (intptr_t) ch, grapheme_break_properties,
-                              grapheme_break_properties_count,
-                              sizeof(struct grapheme_break_property),
-                              grapheme_break_property_cmp);
-  if (!vprop)
-    return HB_Grapheme_Other;
-
-  return ((const struct grapheme_break_property *) vprop)->klass;
-}
-
-HB_WordClass
-HB_GetWordClass(HB_UChar32 ch) {
-  abort();
-  return 0;
-}
-
-HB_SentenceClass
-HB_GetSentenceClass(HB_UChar32 ch) {
-  abort();
-  return 0;
-}
-
-void
-HB_GetGraphemeAndLineBreakClass(HB_UChar32 ch, HB_GraphemeClass *gclass, HB_LineBreakClass *breakclass) {
-  *gclass = HB_GetGraphemeClass(ch);
-  *breakclass = HB_GetLineBreakClass(ch);
-}
-
-static int
-mirroring_property_cmp(const void *vkey, const void *vcandidate) {
-  const uint32_t key = (uint32_t) (intptr_t) vkey;
-  const struct mirroring_property *candidate = vcandidate;
-
-  if (key < candidate->a) {
-    return -1;
-  } else if (key > candidate->a) {
-    return 1;
-  } else {
-    return 0;
-  }
-}
-
-HB_UChar16
-HB_GetMirroredChar(HB_UChar16 ch) {
-  const void *mprop = bsearch((void *) (intptr_t) ch, mirroring_properties,
-                              mirroring_properties_count,
-                              sizeof(struct mirroring_property),
-                              mirroring_property_cmp);
-  if (!mprop)
-    return ch;
-
-  return ((const struct mirroring_property *) mprop)->b;
-}
-
-void *
-HB_Library_Resolve(const char *library, int version, const char *symbol) {
-  abort();
-  return NULL;
-}