/*
blahtex: a TeX to MathML converter designed with MediaWiki in mind
blahtexml: an extension of blahtex with XML processing in mind
http://gva.noekeon.org/blahtexml

Copyright (c) 2006, David Harvey
All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

    * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
    * Neither the names of the authors nor the names of their affiliation may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#include <map>
#include "BlahtexCore/Misc.h"

using namespace std;

// This is an array containing all the possible error codes that blahtex
// can emit, together with their English translations.
//
// The sequences $0, $1, etc correspond to the numbered arguments of the
// error.

// FIX: a future version of the command line application should have a
// "--language" option and read error messages from a file.

pair<wstring, wstring> gEnglishMessagesArray[] =
{
    // Input syntax errors:

    make_pair(L"NonAsciiInMathMode",
        L"Non-ASCII characters may only be used in text mode "
        L"(try enclosing the problem characters in \"\\text{...}\")"
    ),

    make_pair(L"IllegalCharacter",
        L"Illegal character in input"
    ),

    make_pair(L"ReservedCommand",
        L"The command \"$0\" is reserved for internal use by blahtex"
    ),

    make_pair(L"TooManyTokens",
        L"The input is too long"
    ),

    make_pair(L"InvalidColour",
        L"The colour \"$0\" is invalid"
    ),

    make_pair(L"IllegalFinalBackslash",
        L"Illegal backslash \"\\\" at end of input"
    ),

    make_pair(L"UnrecognisedCommand",
        L"Unrecognised command \"$0\""
    ),

    make_pair(L"IllegalCommandInMathMode",
        L"The command \"$0\" is illegal in math mode"
    ),

    make_pair(L"IllegalCommandInMathModeWithHint",
        L"The command \"$0\" is illegal in math mode "
        L"(perhaps you intended to use \"$1\" instead?)"
    ),

    make_pair(L"IllegalCommandInTextMode",
        L"The command \"$0\" is illegal in text mode"
    ),

    make_pair(L"IllegalCommandInTextModeWithHint",
        L"The command \"$0\" is illegal in text mode "
        L"(perhaps you intended to use \"$1\" instead?)"
    ),

    make_pair(L"MissingOpenBraceBefore",
        L"Missing open brace \"{\" before \"$0\""
    ),

    make_pair(L"MissingOpenBraceAfter",
        L"Missing open brace \"{\" after \"$0\""
    ),

    make_pair(L"MissingOpenBraceAtEnd",
        L"Missing open brace \"{\" at end of input"
    ),

    make_pair(L"NotEnoughArguments",
        L"Not enough arguments were supplied for \"$0\""
    ),

    make_pair(L"MissingCommandAfterNewcommand",
        L"Missing or illegal new command name after \"\\newcommand\" "
        L"(there must be precisely one command defined; it must begin "
        L"with a backslash \"\\\" and contain only alphabetic characters)"
    ),

    make_pair(L"IllegalRedefinition",
        L"The command \"$0\" has already been defined; "
        L"you cannot redefine it"
    ),

    make_pair(L"MissingOrIllegalParameterCount",
        L"Missing or illegal parameter count in definition of \"$0\" "
        L"(must be a single digit between 1 and 9 inclusive)"
    ),

    make_pair(L"MissingOrIllegalParameterIndex",
        L"Missing or illegal parameter index in definition of \"$0\""
    ),

    make_pair(L"UnmatchedOpenBracket",
        L"Encountered open bracket \"[\" without matching "
        L"close bracket \"]\""
    ),

    make_pair(L"UnmatchedOpenBrace",
        L"Encountered open brace \"{\" without matching close brace \"}\""
    ),

    make_pair(L"UnmatchedCloseBrace",
        L"Encountered close brace \"}\" without matching open brace \"{\""
    ),

    make_pair(L"UnmatchedLeft",
        L"Encountered \"\\left\" without matching \"\\right\""
    ),

    make_pair(L"UnmatchedRight",
        L"Encountered \"\\right\" without matching \"\\left\""
    ),

    make_pair(L"UnmatchedBegin",
        L"Encountered \"\\begin\" without matching \"\\end\""
    ),

    make_pair(L"UnmatchedEnd",
        L"Encountered \"\\end\" without matching \"\\begin\""
    ),

    make_pair(L"UnexpectedNextCell",
        L"The command \"&\" may only appear inside a "
        L"\"\\begin ... \\end\" block"
    ),

    make_pair(L"UnexpectedNextRow",
        L"The command \"\\\\\" may only appear inside a "
        L"\"\\begin ... \\end\" block"
    ),

    make_pair(L"MismatchedBeginAndEnd",
        L"The commands \"$0\" and \"$1\" do not match"
    ),

    make_pair(L"CasesRowTooBig",
        L"There can only be two entries in each row of a \"cases\" block"
    ),

    make_pair(L"SubstackRowTooBig",
        L"There can only be one entry in each row of a \"substack\" block"
    ),

    make_pair(L"MissingDelimiter",
        L"Missing delimiter after \"$0\""
    ),

    make_pair(L"IllegalDelimiter",
        L"Illegal delimiter following \"$0\""
    ),

    make_pair(L"MisplacedLimits",
        L"The command \"$0\" can only appear after a math operator "
        L"(consider using \"\\mathop\")"
    ),

    make_pair(L"DoubleSuperscript",
        L"Encountered two superscripts attached to the same base "
        L"(only one is allowed)"
    ),

    make_pair(L"DoubleSubscript",
        L"Encountered two subscripts attached to the same base "
        L"(only one is allowed)"
    ),

    make_pair(L"AmbiguousInfix",
        L"Ambiguous placement of \"$0\" (try using additional "
        L"braces \"{ ... }\" to disambiguate)"
    ),

    // Errors specific to generating MathML:

    make_pair(L"UnavailableSymbolFontCombination",
        L"The symbol \"$0\" is not available in the font \"$1\""
    ),

    make_pair(L"TooManyMathmlNodes",
        L"There are too many nodes in the MathML tree"
    ),

    // Errors specific to generating purified TeX

    make_pair(L"PngIncompatibleCharacter",
        L"Unable to correctly generate PNG containing the character $0"
    ),
    
    make_pair(L"WrongFontEncoding",
        L"The symbol \"$0\" may not appear in font encoding \"$1\""
    ),
    
    make_pair(L"WrongFontEncodingWithHint",
        L"The symbol \"$0\" may not appear in font encoding \"$1\" "
        L"(try using the \"$2{...}\" command)"
    ),
    
    make_pair(L"IllegalNestedFontEncodings",
        L"Font encoding commands may not be nested"
    ),

    make_pair(L"LatexPackageUnavailable",
        L"Unable to render PNG because "
        L"the LaTeX package \"$0\" is unavailable"
    ),

    make_pair(L"LatexFontNotSpecified",
        L"No LaTeX font has been specified for \"$0\""
    ),
        
    // Now we have errors which may be generated by the command-line
    // application (i.e. by main.cpp)

    make_pair(L"InvalidUtf8Input",
        L"The input string was not valid UTF-8"
    ),

    make_pair(L"CannotCreateTexFile",
        L"Cannot create tex file"
    ),

    make_pair(L"CannotWriteTexFile",
        L"Cannot write to tex file"
    ),

    make_pair(L"CannotRunLatex",
        L"Cannot run latex"
    ),

    make_pair(L"CannotRunDvipng",
        L"Cannot run dvipng"
    ),
    
    make_pair(L"CannotWritePngDirectory",
        L"Cannot write to output PNG directory"
    ),

    make_pair(L"CannotChangeDirectory",
        L"Cannot change working directory"
    )
};

wishful_hash_map<wstring, wstring> gEnglishMessagesTable(
    gEnglishMessagesArray,
    END_ARRAY(gEnglishMessagesArray)
);


// GetErrorMessage() converts the given exception into an English
// string, using the table gEnglishMessagesTable.
wstring GetErrorMessage(const blahtex::Exception& e)
{
    wishful_hash_map<wstring, wstring>::const_iterator
        messageLookup = gEnglishMessagesTable.find(e.GetCode());
    if (messageLookup == gEnglishMessagesTable.end())
        return L"";

    const wstring& source = messageLookup->second;
    wstring message;

    // Perform argument substitution on error message, e.g. "$2" gets
    // replaced with contents of mArgs[2]
    for (wstring::const_iterator
        ptr = source.begin(); ptr != source.end(); ptr++
    )
    {
        if (*ptr == L'$')
        {
            ptr++;
            int n = (*ptr) - L'0';
            if (n >= 0 && n < e.GetArgs().size())
                message += e.GetArgs()[n];
            else
                message += L"???";
        }
        else
            message += *ptr;
    }

    return message;
}


// Returns a string containing a list of all possible error code and
// their corresponding messages.
wstring GetErrorMessages()
{
    wstring output;

    for (wishful_hash_map<wstring, wstring>::const_iterator
        ptr = gEnglishMessagesTable.begin();
        ptr != gEnglishMessagesTable.end();
        ++ptr
    )
        output += ptr->first + L" " + ptr->second + L"\n";

    return output;
}

// end of file @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@