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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 3349 * This code is part of the Diderot Project (http://diderot-language.cs.uchicago.edu)
4 :     *
5 :     * COPYRIGHT (c) 2015 The University of Chicago
6 : jhr 14 * All rights reserved.
7 :     *
8 :     * Parser glue.
9 :     *)
10 :    
11 :     structure Parser : sig
12 :    
13 :     (* parse a file; return NONE if there are syntax errors *)
14 :     val parseFile : (Error.err_stream * TextIO.instream) -> ParseTree.program option
15 :    
16 :     end = struct
17 :    
18 :     (* glue together the lexer and parser *)
19 :     structure DiderotParser = DiderotParseFn(DiderotLex)
20 :    
21 :     (* error function for lexers *)
22 :     fun lexErr errStrm (pos, msg) = Error.errorAt(errStrm, (pos, pos), msg)
23 :    
24 : jhr 1116 (* map tokens to strings *)
25 :     fun tokToString (DiderotTokens.ID x) = Atom.toString x
26 :     | tokToString (DiderotTokens.STRING s) = concat["\"", String.toCString s, "\""]
27 :     | tokToString (DiderotTokens.FLOAT f) = FloatLit.toString f
28 :     | tokToString (DiderotTokens.INT i) = IntInf.toString i
29 :     | tokToString tok = DiderotTokens.toString tok
30 :    
31 : jhr 14 (* error function for parsers *)
32 : jhr 1116 val parseErr = Error.parseError tokToString
33 : jhr 14
34 :     (* parse a file, returning a parse tree *)
35 :     fun parseFile (errStrm, file) = let
36 : jhr 2356 fun get () = TextIO.input file
37 :     val lexer = DiderotLex.lex (Error.sourceMap errStrm) (lexErr errStrm)
38 :     in
39 :     case DiderotParser.parse lexer (DiderotLex.streamify get)
40 :     of (SOME pt, _, []) => (TextIO.closeIn file; SOME pt)
41 :     | (_, _, errs) => (
42 :     TextIO.closeIn file;
43 :     List.app (parseErr errStrm) errs;
44 :     NONE)
45 :     (* end case *)
46 :     end
47 : jhr 14
48 :     end

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