[Complex Text Layouts] Add third-party TextServer dependencies (ICU, HarfBuzz, Graphite).

thirdparty/graphite/src/inc/Rule.h

@@ -0,0 +1,305 @@
+/*  GRAPHITE2 LICENSING
+
+    Copyright 2011, SIL International
+    All rights reserved.
+
+    This library is free software; you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published
+    by the Free Software Foundation; either version 2.1 of License, or
+    (at your option) any later version.
+
+    This program 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
+    Lesser General Public License for more details.
+
+    You should also have received a copy of the GNU Lesser General Public
+    License along with this library in the file named "LICENSE".
+    If not, write to the Free Software Foundation, 51 Franklin Street,
+    Suite 500, Boston, MA 02110-1335, USA or visit their web page on the
+    internet at http://www.fsf.org/licenses/lgpl.html.
+
+Alternatively, the contents of this file may be used under the terms of the
+Mozilla Public License (http://mozilla.org/MPL) or the GNU General Public
+License, as published by the Free Software Foundation, either version 2
+of the License or (at your option) any later version.
+*/
+
+#pragma once
+
+#include "inc/Code.h"
+#include "inc/Slot.h"
+
+namespace graphite2 {
+
+struct Rule {
+  const vm::Machine::Code * constraint,
+                 * action;
+  unsigned short   sort;
+  byte             preContext;
+#ifndef NDEBUG
+  uint16           rule_idx;
+#endif
+
+  Rule();
+  ~Rule() {}
+
+  CLASS_NEW_DELETE;
+
+private:
+  Rule(const Rule &);
+  Rule & operator = (const Rule &);
+};
+
+inline
+Rule::Rule()
+: constraint(0),
+  action(0),
+  sort(0),
+  preContext(0)
+{
+#ifndef NDEBUG
+  rule_idx = 0;
+#endif
+}
+
+
+struct RuleEntry
+{
+  const Rule   * rule;
+
+  inline
+  bool operator < (const RuleEntry &r) const
+  {
+    const unsigned short lsort = rule->sort, rsort = r.rule->sort;
+    return lsort > rsort || (lsort == rsort && rule < r.rule);
+  }
+
+  inline
+  bool operator == (const RuleEntry &r) const
+  {
+    return rule == r.rule;
+  }
+};
+
+
+struct State
+{
+  const RuleEntry     * rules,
+                      * rules_end;
+
+  bool   empty() const;
+};
+
+inline
+bool State::empty() const
+{
+    return rules_end == rules;
+}
+
+
+class SlotMap
+{
+public:
+  enum {MAX_SLOTS=64};
+  SlotMap(Segment & seg, uint8 direction, size_t maxSize);
+
+  Slot       * * begin();
+  Slot       * * end();
+  size_t         size() const;
+  unsigned short context() const;
+  void           reset(Slot &, unsigned short);
+
+  Slot * const & operator[](int n) const;
+  Slot       * & operator [] (int);
+  void           pushSlot(Slot * const slot);
+  void           collectGarbage(Slot *& aSlot);
+
+  Slot         * highwater() { return m_highwater; }
+  void           highwater(Slot *s) { m_highwater = s; m_highpassed = false; }
+  bool           highpassed() const { return m_highpassed; }
+  void           highpassed(bool v) { m_highpassed = v; }
+
+  uint8          dir() const { return m_dir; }
+  int            decMax() { return --m_maxSize; }
+
+  Segment &    segment;
+private:
+  Slot         * m_slot_map[MAX_SLOTS+1];
+  unsigned short m_size;
+  unsigned short m_precontext;
+  Slot         * m_highwater;
+  int            m_maxSize;
+  uint8          m_dir;
+  bool           m_highpassed;
+};
+
+
+class FiniteStateMachine
+{
+public:
+  enum {MAX_RULES=128};
+
+private:
+  class Rules
+  {
+  public:
+      Rules();
+      void              clear();
+      const RuleEntry * begin() const;
+      const RuleEntry * end() const;
+      size_t            size() const;
+
+      void accumulate_rules(const State &state);
+
+  private:
+      RuleEntry * m_begin,
+                * m_end,
+                  m_rules[MAX_RULES*2];
+  };
+
+public:
+  FiniteStateMachine(SlotMap & map, json * logger);
+  void      reset(Slot * & slot, const short unsigned int max_pre_ctxt);
+
+  Rules     rules;
+  SlotMap   & slots;
+  json    * const dbgout;
+};
+
+
+inline
+FiniteStateMachine::FiniteStateMachine(SlotMap& map, json * logger)
+: slots(map),
+  dbgout(logger)
+{
+}
+
+inline
+void FiniteStateMachine::reset(Slot * & slot, const short unsigned int max_pre_ctxt)
+{
+  rules.clear();
+  int ctxt = 0;
+  for (; ctxt != max_pre_ctxt && slot->prev(); ++ctxt, slot = slot->prev());
+  slots.reset(*slot, ctxt);
+}
+
+inline
+FiniteStateMachine::Rules::Rules()
+  : m_begin(m_rules), m_end(m_rules)
+{
+}
+
+inline
+void FiniteStateMachine::Rules::clear()
+{
+  m_end = m_begin;
+}
+
+inline
+const RuleEntry * FiniteStateMachine::Rules::begin() const
+{
+  return m_begin;
+}
+
+inline
+const RuleEntry * FiniteStateMachine::Rules::end() const
+{
+  return m_end;
+}
+
+inline
+size_t FiniteStateMachine::Rules::size() const
+{
+  return m_end - m_begin;
+}
+
+inline
+void FiniteStateMachine::Rules::accumulate_rules(const State &state)
+{
+  // Only bother if there are rules in the State object.
+  if (state.empty()) return;
+
+  // Merge the new sorted rules list into the current sorted result set.
+  const RuleEntry * lre = begin(), * rre = state.rules;
+  RuleEntry * out = m_rules + (m_begin == m_rules)*MAX_RULES;
+  const RuleEntry * const lrend = out + MAX_RULES,
+                  * const rrend = state.rules_end;
+  m_begin = out;
+  while (lre != end() && out != lrend)
+  {
+    if (*lre < *rre)      *out++ = *lre++;
+    else if (*rre < *lre) { *out++ = *rre++; }
+    else                { *out++ = *lre++; ++rre; }
+
+    if (rre == rrend)
+    {
+      while (lre != end() && out != lrend) { *out++ = *lre++; }
+      m_end = out;
+      return;
+    }
+  }
+  while (rre != rrend && out != lrend) { *out++ = *rre++; }
+  m_end = out;
+}
+
+inline
+SlotMap::SlotMap(Segment & seg, uint8 direction, size_t maxSize)
+: segment(seg), m_size(0), m_precontext(0), m_highwater(0),
+    m_maxSize(int(maxSize)), m_dir(direction), m_highpassed(false)
+{
+    m_slot_map[0] = 0;
+}
+
+inline
+Slot * * SlotMap::begin()
+{
+  return &m_slot_map[1]; // allow map to go 1 before slot_map when inserting
+                         // at start of segment.
+}
+
+inline
+Slot * * SlotMap::end()
+{
+  return m_slot_map + m_size + 1;
+}
+
+inline
+size_t SlotMap::size() const
+{
+  return m_size;
+}
+
+inline
+short unsigned int SlotMap::context() const
+{
+  return m_precontext;
+}
+
+inline
+void SlotMap::reset(Slot & slot, short unsigned int ctxt)
+{
+  m_size = 0;
+  m_precontext = ctxt;
+  *m_slot_map = slot.prev();
+}
+
+inline
+void SlotMap::pushSlot(Slot*const slot)
+{
+  m_slot_map[++m_size] = slot;
+}
+
+inline
+Slot * const & SlotMap::operator[](int n) const
+{
+  return m_slot_map[n + 1];
+}
+
+inline
+Slot * & SlotMap::operator[](int n)
+{
+  return m_slot_map[n + 1];
+}
+
+} // namespace graphite2