34 lines
859 B
OCaml
34 lines
859 B
OCaml
{
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open Errors
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open Lexing
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open Parser
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}
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let alpha = ['a'-'z' 'A'-'Z']
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let num = ['0'-'9']
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let bool = "true" | "false"
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let ident = alpha (alpha | num | '-' | '_')*
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rule token = parse
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| eof { Lend }
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| [ ' ' '\t' ] { token lexbuf }
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| '\n' { Lexing.new_line lexbuf; token lexbuf }
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| num+ as n { Lint (int_of_string n) }
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| "return" { Lreturn }
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| "int" { Ltype (Int_t) }
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| "bool" { Ltype (Bool_t) }
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| bool as b { Lbool (bool_of_string b) }
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| '=' { Lassign }
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| ';' { Lsc }
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| '+' { Ladd }
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| '-' { Lsub }
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| '*' { Lmul }
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| '/' { Ldiv }
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| ident as i { Lvar i }
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| '#' { comment lexbuf }
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| _ as c { raise (LexerError c) }
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and comment = parse
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| eof { Lend }
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| '\n' { Lexing.new_line lexbuf; token lexbuf }
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| _ { comment lexbuf }
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