{-
    BNF Converter: C++ Main file
    Copyright (C) 2004  Author:  Markus Forsberg, Michael Pellauer
    Copyright (C) 2020  Andreas Abel

    Modified from CPPTop to BNFC.Backend.CPP.STL 2006 by Aarne Ranta.

-}

module BNFC.Backend.CPP.STL (makeCppStl,) where

import Data.Char
import Data.Foldable (toList)
import qualified Data.List as List
import qualified Data.Map as Map

import BNFC.Utils
import BNFC.CF
import BNFC.Options
import BNFC.Backend.Base
import BNFC.Backend.C            (bufferH, bufferC)
import BNFC.Backend.C.CFtoBisonC (cf2Bison)
import BNFC.Backend.C.CFtoFlexC  (cf2flex, ParserMode(..))
import BNFC.Backend.CPP.Makefile
import BNFC.Backend.CPP.STL.CFtoSTLAbs
import BNFC.Backend.CPP.STL.CFtoCVisitSkelSTL
import BNFC.Backend.CPP.PrettyPrinter
import BNFC.Backend.CPP.STL.STLUtils
import qualified BNFC.Backend.Common.Makefile as Makefile

makeCppStl :: SharedOptions -> CF -> MkFiles ()
makeCppStl opts cf = do
    let (hfile, cfile) = cf2CPPAbs (linenumbers opts) (inPackage opts) name cf
    mkfile "Absyn.H" hfile
    mkfile "Absyn.C" cfile
    mkfile "Buffer.H" bufferH
    mkfile "Buffer.C" $ bufferC "Buffer.H"
    let (flex, env) = cf2flex parserMode cf
    mkfile (name ++ ".l") flex
    let bison = cf2Bison (linenumbers opts) parserMode cf env
    mkfile (name ++ ".y") bison
    let header = mkHeaderFile (inPackage opts) cf (allParserCats cf) (toList $ allEntryPoints cf) (Map.elems env)
    mkfile "Parser.H" header
    mkfile "ParserError.H" $ printParseErrHeader (inPackage opts)
    let (skelH, skelC) = cf2CVisitSkel True (inPackage opts) cf
    mkfile "Skeleton.H" skelH
    mkfile "Skeleton.C" skelC
    let (prinH, prinC) = cf2CPPPrinter True (inPackage opts) cf
    mkfile "Printer.H" prinH
    mkfile "Printer.C" prinC
    mkfile "Test.C" (cpptest (inPackage opts) cf)
    Makefile.mkMakefile opts $ makefile prefix name
  where
    name :: String
    name = lang opts
    -- The prefix is a string used by flex and bison
    -- that is prepended to generated function names.
    -- It should be a valid C identifier.
    prefix :: String
    prefix = snakeCase_ name ++ "_"
    parserMode :: ParserMode
    parserMode = CppParser (inPackage opts) prefix

printParseErrHeader :: Maybe String -> String
printParseErrHeader inPackage =
  unlines
  [
     " #pragma once "
     , " #include <string>"
     , " #include <stdexcept>"
     , ""
     , nsStart inPackage
     , " class parse_error : public std::runtime_error"
     , " {"
     , " public:"
     , "     parse_error(int line, std::string str)"
     , "         : std::runtime_error(str)"
     , "         , m_line(line) {}"
     , "     int getLine() {"
     , "         return m_line;"
     , "     } "
     , " private:"
     , "     int m_line;"
     , " }; "
     , nsEnd inPackage
     ]

cpptest :: Maybe String -> CF -> String
cpptest inPackage cf =
  unlines
   [
    "/*** Compiler Front-End Test automatically generated by the BNF Converter ***/",
    "/*                                                                          */",
    "/* This test will parse a file, print the abstract syntax tree, and then    */",
    "/* pretty-print the result.                                                 */",
    "/*                                                                          */",
    "/****************************************************************************/",
    "#include <cstdio>",
    "#include <string>",
    "#include <iostream>",
    "#include \"Parser.H\"",
    "#include \"Printer.H\"",
    "#include \"Absyn.H\"",
    "#include \"ParserError.H\"",
    "",
    "void usage() {",
    "  printf(\"usage: Call with one of the following argument " ++
      "combinations:\\n\");",
    "  printf(\"\\t--help\\t\\tDisplay this help message.\\n\");",
    "  printf(\"\\t(no arguments)\\tParse stdin verbosely.\\n\");",
    "  printf(\"\\t(files)\\t\\tParse content of files verbosely.\\n\");",
    "  printf(\"\\t-s (files)\\tSilent mode. Parse content of files " ++
      "silently.\\n\");",
    "}",
    "",
    "int main(int argc, char ** argv)",
    "{",
    "  FILE *input;",
    "  int quiet = 0;",
    "  char *filename = NULL;",
    "",
    "  if (argc > 1) {",
    "    if (strcmp(argv[1], \"-s\") == 0) {",
    "      quiet = 1;",
    "      if (argc > 2) {",
    "        filename = argv[2];",
    "      } else {",
    "        input = stdin;",
    "      }",
    "    } else {",
    "      filename = argv[1];",
    "    }",
    "  }",
    "",
    "  if (filename) {",
    "    input = fopen(filename, \"r\");",
    "    if (!input) {",
    "      usage();",
    "      exit(1);",
    "    }",
    "  } else input = stdin;",
    "  /* The default entry point is used. For other options see Parser.H */",
    "  " ++ scope ++ dat ++ " *parse_tree = NULL;",
    "  try { ",
    "  parse_tree = " ++ scope ++ "p" ++ def ++ "(input);",
    "  } catch( " ++ scope ++ "parse_error &e) {",
    "     std::cerr << \"Parse error on line \" << e.getLine() << \"\\n\"; ",
    "  }",
    "  if (parse_tree)",
    "  {",
    "    printf(\"\\nParse Successful!\\n\");",
    "    if (!quiet) {",
    "      printf(\"\\n[Abstract Syntax]\\n\");",
    "      " ++ scope ++ "ShowAbsyn *s = new " ++ scope ++ "ShowAbsyn();",
    "      printf(\"%s\\n\\n\", s->show(parse_tree));",
    "      printf(\"[Linearized Tree]\\n\");",
    "      " ++ scope ++ "PrintAbsyn *p = new " ++ scope ++ "PrintAbsyn();",
    "      printf(\"%s\\n\\n\", p->print(parse_tree));",
    "    }",
    "    delete(parse_tree);",
    "    return 0;",
    "  }",
    "  return 1;",
    "}",
    ""
   ]
  where
   cat = firstEntry cf
   dat = identCat $ normCat cat
   def = identCat cat
   scope = nsScope inPackage

mkHeaderFile inPackage cf cats eps env = unlines $ concat
  [ [ "#ifndef " ++ hdef
    , "#define " ++ hdef
    , ""
    , "#include<vector>"
    , "#include<string>"
    , "#include \"Absyn.H\""
    , ""
    , nsStart inPackage
    ]
  , concatMap mkFuncs eps
  , [ nsEnd inPackage
    , ""
    , "#endif"
    ]
  ]
  where
  hdef = nsDefine inPackage "PARSER_HEADER_FILE"
  mkFuncs s =
    [ identCat (normCat s) ++ "*" +++ "p" ++ identCat s ++ "(FILE *inp);"
    , identCat (normCat s) ++ "*" +++ "p" ++ identCat s ++ "(const char *str);"
    ]