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[diderot] Annotation of /trunk/src/compiler/parser/parser.sml
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Annotation of /trunk/src/compiler/parser/parser.sml

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1 : jhr 14 (* parser.sml
2 :     *
3 : jhr 435 * COPYRIGHT (c) 2010 The Diderot Project (http://diderot-language.cs.uchicago.edu)
4 : jhr 14 * All rights reserved.
5 :     *
6 :     * Parser glue.
7 :     *)
8 :    
9 :     structure Parser : sig
10 :    
11 :     (* parse a file; return NONE if there are syntax errors *)
12 :     val parseFile : (Error.err_stream * TextIO.instream) -> ParseTree.program option
13 :    
14 :     end = struct
15 :    
16 :     (* glue together the lexer and parser *)
17 :     structure DiderotParser = DiderotParseFn(DiderotLex)
18 :    
19 :     (* error function for lexers *)
20 :     fun lexErr errStrm (pos, msg) = Error.errorAt(errStrm, (pos, pos), msg)
21 :    
22 : jhr 1116 (* map tokens to strings *)
23 :     fun tokToString (DiderotTokens.ID x) = Atom.toString x
24 :     | tokToString (DiderotTokens.STRING s) = concat["\"", String.toCString s, "\""]
25 :     | tokToString (DiderotTokens.FLOAT f) = FloatLit.toString f
26 :     | tokToString (DiderotTokens.INT i) = IntInf.toString i
27 :     | tokToString tok = DiderotTokens.toString tok
28 :    
29 : jhr 14 (* error function for parsers *)
30 : jhr 1116 val parseErr = Error.parseError tokToString
31 : jhr 14
32 :     (* parse a file, returning a parse tree *)
33 :     fun parseFile (errStrm, file) = let
34 :     fun get () = TextIO.input file
35 :     val lexer = DiderotLex.lex (Error.sourceMap errStrm) (lexErr errStrm)
36 :     in
37 :     case DiderotParser.parse lexer (DiderotLex.streamify get)
38 :     of (SOME pt, _, []) => (TextIO.closeIn file; SOME pt)
39 :     | (_, _, errs) => (
40 :     TextIO.closeIn file;
41 :     List.app (parseErr errStrm) errs;
42 :     NONE)
43 :     (* end case *)
44 :     end
45 :    
46 :     end

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