Class ObjectQueryParser

src/core/objects/object_query.h:246–295

* Utility to construct object queries from text. * * The text shall be in the formal language generated by ObjectQuery::toString(): * * ::= | 'OR' * ::= | 'AND' * ::= | | | 'NOT' <Bool

 * <String>           ::=  ...
 */
class ObjectQueryParser
{
public:
	/**
	 * Sets the map for looking up symbols.
	 */
	void setMap(const Map* map);
	
	/**
	 * Returns an ObjectQuery for the given text.
	 * 
	 * The return query has ObjectQuery::OperatorInvalid in case of error.
	 */
	ObjectQuery parse(const QString& text);
	
	/**
	 * In case of error, returns the approximate position where parsing the
	 * text failed.
	 */
	int errorPos() const;
	
	enum TokenType
	{
		TokenUnknown = 0,
		TokenNothing,
		TokenString,
		TokenWord,
		TokenTextOperator,
		TokenSymbol,
		TokenOr,
		TokenAnd,
		TokenNot,
		TokenLeftParen,
		TokenRightParen,
	};
	
private:
	void getToken();
	
	QString tokenAsString() const;
	
	const Symbol* findSymbol(const QString& key) const;
	
	const Map* map = nullptr;
	QStringRef input;
	QStringRef token_text;
	TokenType token;
	int token_start;
	int pos;
};