From 651b6c612db4e809c506973996f2580c4158ac3a Mon Sep 17 00:00:00 2001
From: mickeyl <mickeyl>
Date: Sat, 27 Sep 2003 11:29:26 +0000
Subject: merge dasher which has been introduced in BRANCH first (wtf?) into HEAD

---
(limited to 'inputmethods/dasher/LanguageModel.h')

diff --git a/inputmethods/dasher/LanguageModel.h b/inputmethods/dasher/LanguageModel.h
new file mode 100644
index 0000000..8ffe100
--- a/dev/null
+++ b/inputmethods/dasher/LanguageModel.h
@@ -0,0 +1,123 @@
+// LanguageModel.h
+//
+/////////////////////////////////////////////////////////////////////////////
+//
+// Copyright (c) 2001-2002 David Ward
+//
+/////////////////////////////////////////////////////////////////////////////
+
+// Abstract language model class
+// See PPMModel for an example implementation
+
+// Contexts are indentified by a unique unsigned integer
+
+#ifndef __LanguageModel_h__
+#define __LanguageModel_h__
+
+#include "MSVC_Unannoy.h"
+#include <vector>
+#include <string>
+
+#include "Alphabet.h"
+#include "Context.h"
+
+namespace Dasher {class CLanguageModel;}
+class Dasher::CLanguageModel
+{
+public:
+	CLanguageModel(CAlphabet* Alphabet, int Normalization);
+
+	// Interface for the Dasher code
+	// --------------------------------------------------------------------------
+	class CNodeContext {
+	public:
+		CNodeContext() {};
+		virtual ~CNodeContext() {};
+	};
+	
+	// return the model's normalization - what the probabilities sum to
+	const int normalization() const { return m_iNorm;}
+	
+	CNodeContext* GetRootNodeContext();
+	CNodeContext* CloneNodeContext(CNodeContext* NodeContext);
+	void ReleaseNodeContext(CNodeContext* NodeContext);
+	void EnterNodeSymbol(CNodeContext* NodeContext, symbol Symbol);
+	void LearnNodeSymbol(CNodeContext* NodeContext, symbol Symbol);
+	void EnterText(CNodeContext* NodeContext, std::string TheText);
+	void LearnText(CNodeContext* NodeContext, std::string* TheText, bool IsMore);
+	bool GetNodeProbs(CNodeContext* Context, std::vector<symbol> &NewSymbols,
+		std::vector<unsigned int> &Groups, std::vector<unsigned int> &Probs, double AddProb);
+	
+	// Alphabet pass-through functions for widely needed information
+	symbol GetSpaceSymbol() {return m_Alphabet->GetSpaceSymbol();}
+	
+	int GetColour(int character);
+
+protected:
+	int GetNumberModelChars() {return m_Alphabet->GetNumberSymbols();}
+	
+	// Generic language model functions to be implemented 
+	// --------------------------------------------------------------------------
+	typedef unsigned int modelchar;
+	
+	// return the id for the root context:
+	virtual CContext* GetRootContext()=0;
+	// clone a context and return the new id:
+	virtual CContext* CloneContext(CContext*)=0;
+	// delete a context:
+	virtual void ReleaseContext(CContext*)=0;
+	// diagnostic info:
+	virtual void dump()=0;
+	// add character to the language model:
+	virtual void LearnSymbol(CContext* Context, modelchar Symbol)=0;
+	// update context with a character:
+	virtual void EnterSymbol(CContext* context, modelchar Symbol)=0;
+	// get the probability distrubution at the given context:
+	virtual bool GetProbs(CContext* Context, std::vector<unsigned int> &Probs, double AddProb)=0;
+	
+private:
+	CAlphabet *m_Alphabet;
+	int m_iModelChars; // number of charater in the model 1...ModelChars
+	int m_iNorm;       // normalization of probabilities
+};
+
+using namespace Dasher;
+
+///////////////////////////////////////////////////////////////////
+
+inline CLanguageModel::CNodeContext* CLanguageModel::GetRootNodeContext()
+{
+	return (CNodeContext*) GetRootContext();
+}
+
+///////////////////////////////////////////////////////////////////
+
+inline CLanguageModel::CNodeContext* CLanguageModel::CloneNodeContext(CNodeContext* NodeContext)
+{
+	return (CNodeContext*) CloneContext((CContext*) NodeContext);
+}
+
+///////////////////////////////////////////////////////////////////
+
+inline void CLanguageModel::ReleaseNodeContext(CNodeContext* NodeContext)
+{
+	ReleaseContext((CContext*) NodeContext);
+}
+
+///////////////////////////////////////////////////////////////////
+
+inline void CLanguageModel::EnterNodeSymbol(CNodeContext* NodeContext, symbol Symbol)
+{
+	EnterSymbol((CContext*) NodeContext, (modelchar) Symbol);
+}
+
+///////////////////////////////////////////////////////////////////
+
+inline void CLanguageModel::LearnNodeSymbol(CNodeContext* NodeContext, symbol Symbol)
+{
+	LearnSymbol((CContext*) NodeContext, (modelchar) Symbol);
+}
+
+
+
+#endif /* #ifndef __LanguageModel_h__ */
--
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