Initial import of l2c

[snipe.git] / parse / l1.lex

diff --git a/parse/l1.lex b/parse/l1.lex
deleted file mode 100644 (file)
index a80f936..0000000
--- a/parse/l1.lex
+++ /dev/null
@@ -1,112 +0,0 @@
-(* L1 Compiler
- * Lexer
- * Author: Kaustuv Chaudhuri <kaustuv+@cs.cmu.edu>
- * Modified: Frank Pfenning <fp@cs.cmu.edu>
- *)
-
-structure A = Ast
-structure S = Symbol
-
-type pos = int
-type svalue = Tokens.svalue
-type ('a,'b) token = ('a,'b) Tokens.token
-type lexresult = (svalue,pos) Tokens.token
-
-local
-  val commentLevel = ref 0
-  val commentPos = ref 0
-in
-  fun enterComment yypos =
-      ( commentLevel := !commentLevel + 1 ;
-       commentPos := yypos )
-    
-  fun exitComment () =
-      ( commentLevel := !commentLevel - 1 ;
-       !commentLevel = 0 )
-
-  fun number (yyt, yyp) =
-      let
-        val ext = ParseState.ext (yyp, yyp + size yyt)
-       val numOpt = Word32Signed.fromString yyt
-                     handle Overflow =>
-                           ( ErrorMsg.error ext
-                                ("integral constant `" ^ yyt ^ "' too large") ;
-                             NONE )
-      in
-       case numOpt
-         of NONE => ( ErrorMsg.error ext
-                         ("cannot parse integral constant `" ^ yyt ^ "'");
-                      Tokens.INTNUM (Word32Signed.ZERO, yyp, yyp + size yyt) )
-          | SOME n => Tokens.INTNUM (n,yyp,yyp + size yyt)
-      end
-
-  fun eof () = 
-      ( if (!commentLevel > 0)
-          then (ErrorMsg.error (ParseState.ext (!commentPos,!commentPos)) "unterminated comment")
-          else ();
-       Tokens.EOF (0,0) )              (* bogus position information; unused *)
-
-end
-
-%%
-%header (functor L1LexFn(structure Tokens : L1_TOKENS));
-%full
-%s COMMENT COMMENT_LINE;
-
-id = [A-Za-z_][A-Za-z0-9_]*;
-decnum = [0-9][0-9]*;
-
-ws = [\ \t\012];
-
-%%
-
-<INITIAL> {ws}+       => (lex ());
-<INITIAL> \n          => (ParseState.newline(yypos); lex());
-
-<INITIAL> "{"         => (Tokens.LBRACE (yypos, yypos + size yytext));
-<INITIAL> "}"         => (Tokens.RBRACE (yypos, yypos + size yytext));
-<INITIAL> "("         => (Tokens.LPAREN (yypos, yypos + size yytext));
-<INITIAL> ")"         => (Tokens.RPAREN (yypos, yypos + size yytext));
-
-<INITIAL> ";"         => (Tokens.SEMI (yypos, yypos + size yytext));
-
-<INITIAL> "="         => (Tokens.ASSIGN (yypos, yypos + size yytext));
-<INITIAL> "+="        => (Tokens.PLUSEQ (yypos, yypos + size yytext));
-<INITIAL> "-="        => (Tokens.MINUSEQ (yypos, yypos + size yytext));
-<INITIAL> "*="        => (Tokens.STAREQ (yypos, yypos + size yytext));
-<INITIAL> "/="        => (Tokens.SLASHEQ (yypos, yypos + size yytext));
-<INITIAL> "%="        => (Tokens.PERCENTEQ (yypos, yypos + size yytext));
-
-<INITIAL> "+"         => (Tokens.PLUS (yypos, yypos + size yytext));
-<INITIAL> "-"         => (Tokens.MINUS (yypos, yypos + size yytext));
-<INITIAL> "*"         => (Tokens.STAR (yypos, yypos + size yytext));
-<INITIAL> "/"         => (Tokens.SLASH (yypos, yypos + size yytext));
-<INITIAL> "%"         => (Tokens.PERCENT (yypos, yypos + size yytext));
-
-<INITIAL> "return"    => (Tokens.RETURN (yypos, yypos + size yytext));
-
-<INITIAL> {decnum}    => (number (yytext, yypos));
-
-<INITIAL> {id}        => (let
-                            val id = Symbol.symbol yytext
-                          in 
-                            Tokens.IDENT (id, yypos, yypos + size yytext)
-                          end);
-
-<INITIAL> "/*"        => (YYBEGIN COMMENT; enterComment yypos; lex());
-<INITIAL> "*/"        => (ErrorMsg.error (ParseState.ext (yypos, yypos)) "unbalanced comments";
-                          lex());
-
-<INITIAL> "//"        => (YYBEGIN COMMENT_LINE; lex());
-<INITIAL> "#"         => (YYBEGIN COMMENT_LINE; lex());
-<INITIAL> .           => (ErrorMsg.error (ParseState.ext (yypos,yypos))
-                              ("illegal character: \"" ^ yytext ^ "\"");
-                          lex ());
-
-<COMMENT> "/*"        => (enterComment yypos; lex());
-<COMMENT> "*/"        => (if exitComment () then YYBEGIN INITIAL else (); lex());
-<COMMENT> \n          => (ParseState.newline yypos; lex ());
-<COMMENT> .           => (lex());
-
-<COMMENT_LINE> \n     => (ParseState.newline yypos; YYBEGIN INITIAL; lex());
-<COMMENT_LINE> .      => (lex());