Add initial font metrics and equation rendering.

src/publishing/latex/LatexMathExpression.h

@@ -6,36 +6,81 @@
 #include <memory>
 #include <vector>
 
+class LatexMathExpression;
+using LatexMathExpressionPtr = std::unique_ptr<LatexMathExpression>;
+
 class LatexMathExpression
 {
 public:
-	LatexMathExpression(const std::string& expression = {})
-		: mRawExpression(expression)
+	enum class Type
 	{
+		LINEAR,
+		LEAF,
+		FRACTION,
+		SUBSCRIPT,
+		SUPERSCRIPT
+	};
 
-	}
-
-	void parse()
+	enum class LineState
 	{
-		for (auto c : mRawExpression)
-		{
+		NONE,
+		IN_TAG_NAME,
+		AWAITING_LBRACE,
+		IN_TAG_BODY
+	};
 
-		}
-	}
+	LatexMathExpression(const std::string& expression);
 
-	const std::vector<LatexMathSymbol>& getSymbols() const
-	{
-		return mSymbols;
-	}
+	LatexMathExpression(Type type);
+
+	~LatexMathExpression();
+
+	const std::vector<LatexMathSymbol>& getSymbols() const;
+
+	const std::vector<LatexMathExpressionPtr>& getExpressions() const;
+
+	const Type getType() const;
+
+	void setContent(std::vector<LatexMathSymbol>& symbols);
+
+	void setRawContent(const std::string& content);
+
+	void onTagBodyChar(char c);
+
+	void onFreeChar(char c);
+
+	void onSpace();
+
+	void onLBrace();
+
+	void onRBrace();
+
+	void onSuperscript();
+
+	void onSubscript();
+
+	void onLiteral();
+
+	void onTagBody();
+
+	void onFinishedTagName();
+
+	void onCloseExpression();
+
+	void parse();
 
 private:
+	std::size_t mOpenBraceCount{ 0 };
 
-	unsigned mOpenTagCount{ 0 };
+	LineState mLineState{ LineState::NONE };
+	std::string mWorkingString;
+	std::string mRawBody;
 
-	std::string mRawExpression;
-	std::unique_ptr<LatexMathExpression> mSuperScriptExpr;
-	std::unique_ptr<LatexMathExpression> mSubScriptExpr;
-	std::unique_ptr<LatexMathExpression> mEnclosedExpr;
+	Type mWorkingType{ Type::LEAF };
+	LatexMathExpression* mWorkingExpression{ nullptr };
+	Type mType{ Type::LEAF };
+	std::vector<LatexMathSymbol> mWorkingSymbols;
 
 	std::vector<LatexMathSymbol> mSymbols;
+	std::vector<LatexMathExpressionPtr> mExpressions;
 };