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kicad/CMakeModules/TokenList2DsnLexer.cmake

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# 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, namespace in which the enum T will be placed.
# Keep it short because from outside the class you want a short enum name
# like enum::T. Enums are contained in their own namespace to avoid
# collisions on enum value names, a problem with C++ unless the enum
# itself is in a separate namespace.
#
# 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
#
# Use the max_lexer() CMake function from functions.cmake for invocation convenience.
#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 )
set( LEXERCLASS "${RESULT}_LEXER" )
set( PARSERCLASS "${RESULT}_PARSER" )
#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 "${LEXERCLASS}_H_" )
set( includeFileHeader
"
/* Do not modify this file it was automatically generated by the
* TokenList2DsnLexer CMake script.
*/
#ifndef ${headerTag}
#define ${headerTag}
#include <dsnlexer.h>
/**
* C++ does not put enum _values_ in separate namespaces unless the enum itself
* is in a separate namespace. All the token enums must be in separate namespaces
* otherwise the C++ compiler will eventually complain if it sees more than one
* DSNLEXER in the same compilation unit, say by mutliple header file inclusion.
* Plus this also enables re-use of the same enum name T. A typedef can always be used
* to clarify which enum T is in play should that ever be a problem. This is
* unlikely since Parse() functions will usually only be exposed to one header
* file like this one. But if there is a problem, then use:
* typedef ${enum}::T T;
* within that problem area.
*/
namespace ${enum}
{
/// enum T contains all this lexer's tokens.
enum T
{
// these first few are negative special ones for syntax, and are
// inherited from DSNLEXER.
T_NONE = DSN_NONE,
T_COMMENT = DSN_COMMENT,
T_STRING_QUOTE = DSN_STRING_QUOTE,
T_QUOTE_DEF = DSN_QUOTE_DEF,
T_DASH = DSN_DASH,
T_SYMBOL = DSN_SYMBOL,
T_NUMBER = DSN_NUMBER,
T_RIGHT = DSN_RIGHT, // right bracket: ')'
T_LEFT = DSN_LEFT, // left bracket: '('
T_STRING = DSN_STRING, // a quoted string, stripped of the quotes
T_EOF = DSN_EOF, // special case for end of file
"
)
set( sourceFileHeader
"
/* Do not modify this file it was automatically generated by the
* TokenList2DsnLexer CMake script.
*
* Include this file in your lexer class to provide the keywords for
* your DSN lexer.
*/
#include <${outHeaderFile}>
using namespace ${enum};
#define TOKDEF(x) { #x, T_##x }
const KEYWORD ${LEXERCLASS}::keywords[] = {
"
)
file( STRINGS ${inputFile} lines NO_HEX_CONVERSION )
foreach( line ${lines} )
math( EXPR lineCount "${lineCount} + 1" )
# strip any comment from # to end of line
string( REGEX REPLACE "#.*$" "" tmpToken "${line}" )
string( STRIP "${tmpToken}" token )
# Ignore empty lines.
if( NOT token STREQUAL "" ) # if token is "off" simple if( token) does not work
# Make sure token is valid.
#message( "token=${token}" )
string( REGEX MATCH "[a-z][_0-9a-z]*" validToken "${token}" )
#message( "validToken=${validToken}" )
if( validToken STREQUAL token )
list( APPEND tokens "${validToken}" )
else()
message( FATAL_ERROR
"Invalid token string \"${tmpToken}\" at line ${lineCount} in file "
"<${inputFile}>." )
endif()
endif()
endforeach()
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 <${inputFile}>." )
endif()
file( WRITE "${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()
file( APPEND "${outHeaderFile}"
" };
} // namespace ${enum}
/**
* Class ${LEXERCLASS}
* is an automatically generated class using the TokenList2DnsLexer.cmake
* technology, based on keywords provided by file:
* ${inputFile}
*/
class ${LEXERCLASS} : public DSNLEXER
{
/// Auto generated lexer keywords table and length:
static const KEYWORD keywords[];
static const unsigned keyword_count;
public:
/**
* Constructor ( const std::string&, const wxString& )
* @param aSExpression is (utf8) text possibly from the clipboard that you want to parse.
* @param aSource is a description of the origin of @a aSExpression, such as a filename.
* If left empty, then _(\"clipboard\") is used.
*/
${LEXERCLASS}( const std::string& aSExpression, const wxString& aSource = wxEmptyString ) :
DSNLEXER( keywords, keyword_count, aSExpression, aSource )
{
}
/**
* Constructor ( FILE* )
* takes @a aFile already opened for reading and @a aFilename as parameters.
* The opened file is assumed to be positioned at the beginning of the file
* for purposes of accurate line number reporting in error messages. The
* FILE is closed by this instance when its destructor is called.
* @param aFile is a FILE already opened for reading.
* @param aFilename is the name of the opened file, needed for error reporting.
*/
${LEXERCLASS}( FILE* aFile, const wxString& aFilename ) :
DSNLEXER( keywords, keyword_count, aFile, aFilename )
{
}
/**
* Constructor ( LINE_READER* )
* initializes a lexer and prepares to read from @a aLineReader which
* is assumed ready, and may be in use by other DSNLEXERs also. No ownership
* is taken of @a aLineReader. This enables it to be used by other lexers also.
* The transition between grammars in such a case, must happen on a text
* line boundary, not within the same line of text.
*
* @param aLineReader is any subclassed instance of LINE_READER, such as
* STRING_LINE_READER or FILE_LINE_READER. No ownership is taken of aLineReader.
*/
${LEXERCLASS}( LINE_READER* aLineReader ) :
DSNLEXER( keywords, keyword_count, aLineReader )
{
}
/**
* Function TokenName
* returns the name of the token in ASCII form.
*/
static const char* TokenName( ${enum}::T aTok );
/**
* 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}::T - the type of token found next.
* @throw IO_ERROR - only if the LINE_READER throws it.
*/
${enum}::T NextTok()
{
return (${enum}::T) DSNLEXER::NextTok();
}
/**
* Function NeedSYMBOL
* calls NextTok() and then verifies that the token read in
* satisfies bool IsSymbol().
* If not, an IO_ERROR is thrown.
* @return int - the actual token read in.
* @throw IO_ERROR, if the next token does not satisfy IsSymbol()
*/
${enum}::T NeedSYMBOL()
{
return (${enum}::T) DSNLEXER::NeedSYMBOL();
}
/**
* Function NeedSYMBOLorNUMBER
* calls NextTok() and then verifies that the token read in
* satisfies bool IsSymbol() or tok==T_NUMBER.
* If not, an IO_ERROR is thrown.
* @return int - the actual token read in.
* @throw IO_ERROR, if the next token does not satisfy the above test
*/
${enum}::T NeedSYMBOLorNUMBER()
{
return (${enum}::T) DSNLEXER::NeedSYMBOLorNUMBER();
}
/**
* Function CurTok
* returns whatever NextTok() returned the last time it was called.
*/
${enum}::T CurTok()
{
return (${enum}::T) DSNLEXER::CurTok();
}
/**
* Function PrevTok
* returns whatever NextTok() returned the 2nd to last time it was called.
*/
${enum}::T PrevTok()
{
return (${enum}::T) DSNLEXER::PrevTok();
}
};
// example usage
/**
* Class ${LEXCLASS}_PARSER
* holds data and functions pertinent to parsing a S-expression file .
*
class ${PARSERCLASS} : public ${LEXERCLASS}
{
};
*/
#endif // ${headerTag}
"
)
file( APPEND "${outCppFile}"
"};
const unsigned ${LEXERCLASS}::keyword_count = unsigned( sizeof( ${LEXERCLASS}::keywords )/sizeof( ${LEXERCLASS}::keywords[0] ) );
const char* ${LEXERCLASS}::TokenName( T aTok )
{
const char* ret;
if( aTok < 0 )
ret = DSNLEXER::Syntax( aTok );
else if( (unsigned) aTok < keyword_count )
ret = keywords[aTok].name;
else
ret = \"token too big\";
return ret;
}
"
)
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