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(* Copyright 2012 Ian Hinder
This file is part of Kranc.
Kranc is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
Kranc is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Kranc; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*)
BeginPackage["Piraha`", {"Errors`", "Helpers`", "JLink`", "Kranc`"}];
Parse::usage = "Parse[grammarfile, pattern, inputfile] parses a file named inputfile using a grammar stored in a file named grammarfile using pattern as the root pattern. The parse tree is returned as Symbolic XML.";
Begin["`Private`"];
InstallJava[];
(* The JRE does not share a current directory with the Mathematica
kernel, so relative paths have to be converted to absolute paths.
It is not possible to change the JRE working directory. *)
absPath[s_String] :=
If[StringTake[s,1] === $PathnameSeparator, s, FileNameJoin[{Directory[],s}]];
fullKrancDir = absPath[KrancDirectory];
AddToClassPath[
FileNameJoin[{fullKrancDir, "Tools","PirahaPEG","piraha.jar"}]];
DefFn[
Parse[grammarFileName_String, pattern_String, inputFileName_String] :=
Module[
{gf,g,m,c,sw,dout,xmlString,xml},
If[FileExistsQ[grammarFileName],
gf = grammarFileName,
If[FileExistsQ[FileNameJoin[{fullKrancDir, "Auxiliary", "Grammars", grammarFileName}]],
gf=FileNameJoin[{fullKrancDir, "Auxiliary", "Grammars", grammarFileName}],
ThrowError[StringForm["Cannot find grammar '`1`'", grammarFileName]]]];
g = JavaNew["edu.lsu.cct.piraha.Grammar"];
g@compileFile[JavaNew["java.io.File", gf]];
c = Grammar`readContents[JavaNew["java.io.File", absPath@inputFileName]];
m = g@matcher[pattern, c];
If[!m@match[0], ThrowError["Failed to parse input file: ",inputFileName,m@near[]@toString[]]];
sw = JavaNew["java.io.StringWriter"];
dout = JavaNew["edu.lsu.cct.piraha.DebugOutput", JavaNew["java.io.PrintWriter", sw]];
m@dumpMatchesXML[dout];
dout@flush[];
xmlString = sw@toString[];
xml = ImportString[xmlString, "XML"];
xml]];
End[];
EndPackage[];
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