pgLab/core/SqlLexer.h

#ifndef SQLLEXER_H
#define SQLLEXER_H

#include <QString>

enum class BasicTokenType {
	None,
	End, // End of input
	Symbol, // can be many things, keyword, object name, operator, ..
	Comment,
	BlockComment,
	OpenBlockComment, // Busy with a block comment end not detected before end of current input
	QuotedString,
	DollarQuote, // Return the dollar quote tag, do not consume the entire string (potentially long)
	QuotedIdentifier,
    Parameter
};

enum class LexerState {
	Null,
	InDollarQuotedString,
	InBlockComment
};


class SqlLexer {
public:
	SqlLexer(const QString &block, LexerState currentstate);
	QChar nextChar();
	QChar peekChar();
	/**
	 * @brief NextBasicToken
	 * @param in
	 * @param ofs
	 * @param start
	 * @param length
	 * @return false when input seems invalid, it will return what it did recognize but something wasn't right, parser should try to recover
	 */
	bool nextBasicToken(int &startpos, int &length, BasicTokenType &tokentype, QString &out);

	LexerState currentState() const { return m_state; }
private:
	QString m_block;
	int m_pos = 0;
	LexerState m_state;


};

#endif // SQLLEXER_H