#
#  This program source code file is part of KICAD, a free EDA CAD application.
#
#  Copyright (C) 2010 Wayne Stambaugh <stambaughw@verizon.net>
#  Copyright (C) 2010 Kicad Developers, see AUTHORS.txt for contributors.
#
#  This program 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.
#
#  This program 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 this program; if not, you may find one here:
#  http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
#  or you may search the http://www.gnu.org website for the version 2 license,
#  or you may write to the Free Software Foundation, Inc.,
#  51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
#
#
# This script converts a plain text file with a line feed separated list
# of token names into the appropriate source and header files required by
# the DSN lexer.  See files "<base_source_path>/common/dsnlexer.cpp" and
# "<base_source_path>/include/dsnlexer.h" for more information about how
# the DSN lexer works.  The token list file format requires a single token
# per line.  Tokens can only contain lower case letters, numbers, and
# underscores.  The first letter of each token must be a lower case letter.
# Tokens must be unique.  If any of the above criteria are not met, the
# source and header files will not be generated and a build error will
# occur.
#
# Valid tokens:    a a1 foo_1 foo_bar2
# Invalid tokens:  1 A _foo bar_ foO
#
# Invocation Parameters are:  enum, inputFile, outCppFile, outHeaderFile
#
#     enum       - Required, name of the enum to generate.
#
#     inputFile  - Required, name of the token list file, or "*.keywords" file.
#                  Choose the basefilename carefully, it decides the class name
#                  used in the generated *_lexer.h file.
#
#     outCppFile - Optional, full path and file name of where to save the generated
#                  cpp keywords file.  If not defined, the output path is the same
#                  path as the token list file path, with a file name of *_keywords.cpp
#
#  outHeaderFile - Optional, full path and file name of where to save the generated
#                  *.h lexfer file.  If not defined, the output path is the same
#                  path as the token list file path, with a file name of *_lexer.h
#
# Example Usage from within a CMakeLists.txt file is shown below.  CMake itself
# is invoked as a child process to execute this script and parameters are passed on
# the command line, which is formulated as the "COMMAND" sequence below:
#
# add_custom_command(
#     OUTPUT  ${CMAKE_BINARY_DIR}/cmp_library_lexer.h
#             ${CMAKE_BINARY_DIR}/cmp_library_keywords.cpp
#     COMMAND ${CMAKE_COMMAND}
#             -Denum=YOURTOK_T
#             -DinputFile=${CMAKE_CURRENT_SOURCE_DIR}/cmp_library.keywords
#             -DoutCppFile=${CMAKE_CURRENT_SOURCE_DIR}/cmp_library_keywords.cpp
#             -DoutHeaderFile=${CMAKE_CURRENT_SOURCE_DIR}/cmp_library_lexer.h
#             -P ${CMAKE_MODULE_PATH}/TokenList2DsnLexer.cmake
#     DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/cmp_library.keywords
#     COMMENT "creating ${CMAKE_CURRENT_SOURCE_DIR}/cmp_library_{lexer.h,keywords.cpp}
#         from ${CMAKE_CURRENT_SOURCE_DIR}/cmp_library.keywords"
# )

#message( STATUS "TokenList2DsnLexer.cmake" )    # indicate we are running

set( tokens "" )
set( lineCount 0 )
set( dsnErrorMsg "TokenList2DsnLexer.cmake failure:" )

if( NOT EXISTS ${inputFile} )
    message( FATAL_ERROR "${dsnErrorMsg} file ${inputFile} cannot be found." )
endif()

if( NOT DEFINED enum )
    message( FATAL_ERROR "${dsnErrorMsg} missing \"enum\" processing ${inputFile}." )
endif()

get_filename_component( outputPath "${inputFile}" PATH )

# the keywords filename without extension is important, it sets the classname into RESULT
get_filename_component( result "${inputFile}" NAME_WE )
string( TOUPPER "${result}" RESULT )

#message( "enum:'${enum}' result:'${result}' outputPath:'${outputPath}' inputFile:'${inputFile}'" )

if( NOT DEFINED outCppFile )
    set( outCppFile "${outputPath}/${result}_keywords.cpp" )
endif()

if( NOT DEFINED outHeaderFile )
    set( outHeaderFile "${outputPath}/${result}_lexer.h" )
endif()

# Create tag for generating header file.
set( headerTag "_${RESULT}_H_" )

set( includeFileHeader
"
/* Do not modify this file it was automatically generated by the
 * TokenList2DsnLexer CMake script.
 */

#ifndef ${headerTag}
#define ${headerTag}

#include \"dsnlexer.h\"

namespace DSN {

enum ${enum} {

    // these first few are negative special ones for syntax, and are
    // inherited from DSNLEXER.
    T_NONE = DSN_NONE,
    T_COMMENT = DSN_COMMENT,
    T_STRING_QUOTE = DSN_STRING_QUOTE,
    T_QUOTE_DEF = DSN_QUOTE_DEF,
    T_DASH = DSN_DASH,
    T_SYMBOL = DSN_SYMBOL,
    T_NUMBER = DSN_NUMBER,
    T_RIGHT = DSN_RIGHT,    // right bracket, ')'
    T_LEFT = DSN_LEFT,      // left bracket, '('
    T_STRING = DSN_STRING,  // a quoted string, stripped of the quotes
    T_EOF = DSN_EOF,        // special case for end of file

"
)

set( sourceFileHeader
"
/* Do not modify this file it was automatically generated by the
 * TokenList2DsnLexer CMake script.
 *
 * Include this file in your lexer class to provide the keywords for
 * your DSN lexer.
 */

#include \"fctsys.h\"
#include \"macros.h\"

#include \"${result}_lexer.h\"

namespace DSN {

#define TOKDEF(x)    { #x, T_##x }

const KEYWORD ${result}_keywords[] = {
"
)

file( STRINGS ${inputFile} tmpTokens NO_HEX_CONVERSION )

foreach( tmpToken ${tmpTokens} )
    math( EXPR lineCount "${lineCount} + 1" )

    string( STRIP tmpToken "${tmpToken}" )

    # Ignore empty lines.
    if( tmpToken )
        # Make sure token is valid.
        string( REGEX MATCH "[a-z][_0-9a-z]*[0-9a-z]$" validToken "${tmpToken}" )
        if( validToken STREQUAL tmpToken )
            list( APPEND tokens "${validToken}" )
        else( validToken STREQUAL tmpToken )
            message( FATAL_ERROR
                     "Invalid token string \"${tmpToken}\" at line ${lineCount} in file "
                     "<${inputFile}>." )
        endif( validToken STREQUAL tmpToken )
    endif( tmpToken )
endforeach( tmpToken ${tmpTokens} )

list( SORT tokens )

# Check for duplicates.
list( LENGTH tokens tokensBefore )
list( REMOVE_DUPLICATES tokens )
list( LENGTH tokens tokensAfter )

if( NOT ( tokensBefore EQUAL tokensAfter ) )
    message( FATAL_ERROR "Duplicate tokens found in file <${inputFile}>." )
endif( NOT ( tokensBefore EQUAL tokensAfter ) )

file( WRITE "${outHeaderFile}" "${includeFileHeader}" )
file( WRITE "${outCppFile}" "${sourceFileHeader}" )

set( lineCount 1 )

foreach( token ${tokens} )
    if( lineCount EQUAL 1 )
        file( APPEND "${outHeaderFile}" "    T_${token} = 0" )
    else( lineCount EQUAL 1 )
        file( APPEND "${outHeaderFile}" "    T_${token}" )
    endif( lineCount EQUAL 1 )

    file(APPEND "${outCppFile}" "    TOKDEF( ${token} )" )

    if( lineCount EQUAL tokensAfter )
        file( APPEND "${outHeaderFile}" "\n" )
        file( APPEND "${outCppFile}" "\n" )
    else( lineCount EQUAL tokensAfter )
        file( APPEND "${outHeaderFile}" ",\n" )
        file( APPEND "${outCppFile}" ",\n" )
    endif( lineCount EQUAL tokensAfter )
    math( EXPR lineCount "${lineCount} + 1" )
endforeach( token ${tokens} )

file( APPEND "${outHeaderFile}"
"};

extern const KEYWORD  ${result}_keywords[];
extern const unsigned ${result}_keyword_count;

}   // End namespace DSN

using namespace DSN;    // enum ${enum} is in this namespace

class ${RESULT}_LEXER : public DSNLEXER
{
public:
    /**
     * Constructor ${RESULT}_LEXER
     * @param aClipboartTxt is std::string (8 bit) text possibly from the
     * clipboard that you want to parse.
     */
    ${RESULT}_LEXER( const std::string& aClipboardTxt ) :
        DSNLEXER( aClipboardTxt,
                  DSN::${result}_keywords,
                  DSN::${result}_keyword_count )
    {
    }

    /**
     * Constructor ${RESULT}_LEXER
     * takes @a aFile already opened for reading and @a aFilename as parameters.
     * The opened file is not closed by this class, and is assumed to be positioned
     * at the beginning of the file for purposes of accurate line number reporting
     * in error messages.
     * @param aFile is a FILE already opened for reading.
     * @param aFilename is the name of the opened file, needed for error reporting.
     */
    ${RESULT}_LEXER( FILE* aFile, const wxString& aFilename ) :
        DSNLEXER( aFile, aFilename,
                  DSN::${result}_keywords,
                  DSN::${result}_keyword_count )
    {
    }

    /**
     * Function NextTok
     * returns the next token found in the input file or T_EOF when reaching
     * the end of file.  Users should wrap this function to return an enum
     * to aid in grammar debugging while running under a debugger, but leave
     * this lower level function returning an int (so the enum does not collide
     * with another usage).
     * @return ${enum} - the type of token found next.
     * @throw IOError - only if the LINE_READER throws it.
     */
    ${enum} NextTok() throw (IOError)
    {
        return (${enum}) DSNLEXER::NextTok();
    }

    /**
     * Function NeedSYMBOL
     * calls NextTok() and then verifies that the token read in
     * satisfies bool IsSymbol().
     * If not, an IOError is thrown.
     * @return int - the actual token read in.
     * @throw IOError, if the next token does not satisfy IsSymbol()
     */
    ${enum} NeedSYMBOL() throw( IOError )
    {
        return (${enum}) DSNLEXER::NeedSYMBOL();
    }

    /**
     * Function NeedSYMBOLorNUMBER
     * calls NextTok() and then verifies that the token read in
     * satisfies bool IsSymbol() or tok==T_NUMBER.
     * If not, an IOError is thrown.
     * @return int - the actual token read in.
     * @throw IOError, if the next token does not satisfy the above test
     */
    ${enum} NeedSYMBOLorNUMBER() throw( IOError )
    {
        return (${enum}) DSNLEXER::NeedSYMBOLorNUMBER();
    }

    /**
     * Function CurTok
     * returns whatever NextTok() returned the last time it was called.
     */
    ${enum} CurTok()
    {
        return (${enum}) DSNLEXER::CurTok();
    }

    /**
     * Function PrevTok
     * returns whatever NextTok() returned the 2nd to last time it was called.
     */
    ${enum} PrevTok()
    {
        return (${enum}) DSNLEXER::PrevTok();
    }
};

// example usage

/**
 * Class ${RESULT}_PARSER
 * holds data and functions pertinent to parsing a S-expression file .
 *
class ${RESULT}_PARSER : public ${RESULT}_LEXER
{

};
 */

#endif   // ${headerTag}
"
)

file( APPEND "${outCppFile}"
"};

const unsigned ${result}_keyword_count = DIM( ${result}_keywords );

}   // End namespace DSN
"
)