Is it always necessary to do so? What does it look like?
Lexers don t deal with semantics, they only deal with turning a stream of characters into tokens (sequences of characters that have meaning to the compiler). Semantics are determined during syntactic analysis. See this answer to a previous question for further details on the stages of compilation.
In yacc, your lexer gets a global variable named yylval which is a C union. Back in yacc, this becomes the value for $1, $2, etc.
Lexer don t care about semantic the only mission in life for lexers is to convert the source code (stream of characters) into tokens each has this form <Token_type, Information_related_to_token> the information maybe the value of the token (string), the name of the operator (=) ...
Tokens then are sent to a parser that deals with syntactic analysis. as a side job a lexer can create a symbols table.
If I just add on to the following yacc file, will it turn into a parser? /* C-Minus BNF Grammar */ %token ELSE %token IF %token INT %token RETURN %token VOID %token WHILE %token ID %token NUM %...
Is it always necessary to do so? What does it look like?
Is it true that in the following file, INT is taken literally, while ID is not? How can you tell? /* C-Minus BNF Grammar */ %token ELSE %token IF %token INT %token RETURN %token VOID %token WHILE %...
Below is my rule, when i replace $2 with = my code works. I know by default all literal tokens uses their ascii value (hence why multi character token require a definition) The below doesnt work. ...
When I run yacc -d parser.y on the following file I get the following errors: parser.y:23.3-24.4: warning: unused value: $4 15 rules never reduced parser.y: warning: 7 useless nonterminals and 15 ...
I m given a yacc file and I m supposed to create a symbol table. What do I do after I use yacc on the file?
When I try to use yacc on the following file I get the error conflicts: 1 shift/reduce How can I find and fix the conflict? /* C-Minus BNF Grammar */ %token ELSE %token IF %token INT %token RETURN %...
I am trying to put together a proof of concept of an XSS-safe string interpolation scheme. Given a string with substitutions, "Hello <b>$planetoid</b>!" I want break it into literal ...
