#define MSP_DATAFILE_PARSER_H_
#include <string>
+#include <msp/core/noncopyable.h>
#include "input.h"
namespace Msp {
namespace DataFile {
+class Loader;
+class LoaderAction;
class ParserMode;
-class Statement;
-struct Token;
+struct Statement;
+struct StatementKey;
/**
Frontend for loading datafiles. Handles switching between text and binary
formats. A Parser evaluates into a boolean value indicating whether more
statements may be read.
*/
-class Parser
+class Parser: private NonCopyable
{
private:
Input in;
std::string main_src;
std::string src;
- bool good;
- ParserMode *mode;
+ bool good = true;
+ ParserMode *mode = nullptr;
public:
Parser(IO::Base &i, const std::string &s);
~Parser();
- /**
- Reads a statement from the input. If the end of input was reached, an empty
- invalid statement will be returned. If an error occurs, the parser will be
- marked as bad and no more statements may be read, even if the exception was
- caught.
- */
+ /** Reads a statement from the input. If the end of input was reached, an
+ empty invalid statement will be returned. If an error occurs, the parser
+ will be marked as bad and no more statements may be read, even if the
+ exception was caught. */
Statement parse(bool raw = false);
- operator bool() const { return good && in; }
+private:
+ void process_control_statement(const Statement &);
+
+public:
+ /** Returns a key for the next statement, consisting of its keyword and
+ signature. Not supported in all modes. */
+ const StatementKey *peek(unsigned);
+
+ /** Parses a statement and feeds its arguments to an action. The action
+ must be appropriate for the statement. Use peek() to determine the
+ statement's signature. */
+ bool parse_and_load(unsigned, Loader &, const LoaderAction &);
+
+ explicit operator bool() const { return good && in; }
};
} // namespace DataFile