I'm attempting to write a lexer and parser but I'm having trouble getting the final variable in a text file due to in_file.tellg()
equaling -1. My program only works if I add a space character after the variable, otherwise I get a compiler error. I want to mention that I'm able to get every other variable in the text file but the last one. I believe the cause of the problem is in_file.peek()!=EOF
setting in_file.tellg()
to -1.
My program is something like this:
ifstream in(file_name);
char c;
in >> noskipws;
while(in >> c ){
if(is_letter_part_of_variable(c)) {
int start_pos = in.tellg(),
end_pos,
length;
while(is_letter_part_of_variable(c) && in.peek()!=EOF ) {
in>>c;
}
end_pos = in.tellg(); // This becomes -1 for some reason
length = end_pos - start_pos; // Should be 7
// Reset file pointer to original position to chomp word.
in.clear();
in.seekg(start_pos-1, in.beg);
// The word 'message' should go in here.
char *identifier = new char[length];
in.read(identifier, length);
identifier[length] = '\0';
}
}
example.text
message = "Hello, World"
print message
I tried removing peek()!= EOF
which gives me an eternal loop. I tried !in_file.eof()
and that also makes tellg()
equal to -1. What can I do to fix/enhance this code?