--File ParserInputDefs.mesa
--November 7, 1979 11:55 AM

ParserInputDefs: DEFINITIONS =

BEGIN

EOF: CHARACTER = 004C;

--Low level routines to handle character I/O from files.

--Initialize and clean up routines.
InitInput: PROCEDURE RETURNS [BOOLEAN];
--Cleans up
FinishInput: PROCEDURE RETURNS [BOOLEAN];

--Save the current input file and switches to input from the file specified. GetChar automatically unstacks. Returns FALSE on error.
InFromFile: PROCEDURE [STRING] RETURNS [BOOLEAN];

--Returns the next character from the file, advances a pointer so that successive calls give successive characters. Returns EOF if the end of the input file have been reached.
GetChar: PROCEDURE RETURNS [CHARACTER];

--Returns the next character from the file without advancing the pointer, providing one character look ahead. Returns EOF if there are no more characters to be had.
Peek: PROCEDURE RETURNS [CHARACTER];

--Returns TRUE if...
EndOfFile: PROCEDURE RETURNS [BOOLEAN];

--Munches characters from the input file through the first instance of its argument. Returns the last character munched (either its arg or EOF).
Flush: PROCEDURE [CHARACTER] RETURNS [CHARACTER];

--Identifies the current input line.
Identify: PROCEDURE;

END.