The lexer is the first step in the compilation process and it is the first part of the A_Language compiler to be implemented.
The lexer outlined in this document is a simple lexer that is capable of tokenizing the following tokens:
-
Keywords:
func,num,void,if,else,while,return,const,string,var,int,float -
Identifiers
-
Numbers (integers and floats)
-
Strings
-
Operators:
+,-,*,/,=,==,<,>,&,&&,|,||,! -
Delimiters:
(,),{,},[,],,,; -
Comments:
//
The parser is the second step in the compilation process and it is the second part of the A_Language compiler to be implemented. To this point the parser is capable of parsing the following:
- Function declarations no parameters so far
- Type declarations:
void, custom types - Block statements simple so far
The language has the functions as the main and only building block. The functions can be declared with the following syntax:
func main() : void {
// code goes here
}
The grammer rules for the A_Language are written in BNF form. The grammar rules are listed in the grammar.md file.
- The lexer assumes that the input file is an ascii file.
- The lexer assumes that the input file is a valid A_Language program. It does not check for syntax errors yet.
- The lexer does not recognize the following tokens:
+=,-=,*=,/=,++,--+=,-=,*=,/=,++,--<<,>>,^,~,->,::<<=,>>=,&=,|=,^=
- The lexer does not support multi-line comments.