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kicad/include/dsnlexer.h

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/*
* This program source code file is part of KICAD, a free EDA CAD application.
*
* Copyright (C) 2007-2010 SoftPLC Corporation, Dick Hollenbeck <dick@softplc.com>
* Copyright (C) 2007-2015 Kicad Developers, see change_log.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
*/
#ifndef DSNLEXER_H_
#define DSNLEXER_H_
#include <cstdio>
#include <hashtables.h>
#include <string>
#include <vector>
#include <richio.h>
#ifndef SWIG
/**
* Struct KEYWORD
* holds a keyword string and its unique integer token.
*/
struct KEYWORD
{
const char* name; ///< unique keyword.
int token; ///< a zero based index into an array of KEYWORDs
};
#endif
// something like this macro can be used to help initialize a KEYWORD table.
// see SPECCTRA_DB::keywords[] as an example.
//#define TOKDEF(x) { #x, T_##x }
/**
* Enum DSN_SYNTAX_T
* lists all the DSN lexer's tokens that are supported in lexing. It is up
* to the parser if it wants also to support them.
*/
enum DSN_SYNTAX_T {
DSN_NONE = -11,
DSN_COMMENT = -10,
DSN_STRING_QUOTE = -9,
DSN_QUOTE_DEF = -8,
DSN_DASH = -7,
DSN_SYMBOL = -6,
DSN_NUMBER = -5,
DSN_RIGHT = -4, // right bracket, ')'
DSN_LEFT = -3, // left bracket, '('
DSN_STRING = -2, // a quoted string, stripped of the quotes
DSN_EOF = -1 // special case for end of file
};
/**
* DSNLEXER
* implements a lexical analyzer for the SPECCTRA DSN file format. It
* reads lexical tokens from the current LINE_READER through the NextTok()
* function.
*/
class DSNLEXER
{
#ifndef SWIG
protected:
bool iOwnReaders; ///< on readerStack, should I delete them?
const char* start;
const char* next;
const char* limit;
char dummy[1]; ///< when there is no reader.
typedef std::vector<LINE_READER*> READER_STACK;
READER_STACK readerStack; ///< all the LINE_READERs by pointer.
LINE_READER* reader; ///< no ownership. ownership is via readerStack, maybe, if iOwnReaders
bool specctraMode; ///< if true, then:
///< 1) stringDelimiter can be changed
///< 2) Kicad quoting protocol is not in effect
///< 3) space_in_quoted_tokens is functional
///< else not.
char stringDelimiter;
bool space_in_quoted_tokens; ///< blank spaces within quoted strings
bool commentsAreTokens; ///< true if should return comments as tokens
int prevTok; ///< curTok from previous NextTok() call.
int curOffset; ///< offset within current line of the current token
int curTok; ///< the current token obtained on last NextTok()
std::string curText; ///< the text of the current token
const KEYWORD* keywords; ///< table sorted by CMake for bsearch()
unsigned keywordCount; ///< count of keywords table
KEYWORD_MAP keyword_hash; ///< fast, specialized "C string" hashtable
void init();
int readLine()
{
if( reader )
{
reader->ReadLine();
unsigned len = reader->Length();
// start may have changed in ReadLine(), which can resize and
// relocate reader's line buffer.
start = reader->Line();
next = start;
limit = next + len;
return len;
}
return 0;
}
/**
* Function findToken
* takes aToken string and looks up the string in the keywords table.
*
* @param aToken is a string to lookup in the keywords table.
* @return int - with a value from the enum DSN_T matching the keyword text,
* or DSN_SYMBOL if @a aToken is not in the kewords table.
*/
int findToken( const std::string& aToken );
bool isStringTerminator( char cc )
{
if( !space_in_quoted_tokens && cc==' ' )
return true;
if( cc == stringDelimiter )
return true;
return false;
}
#endif
public:
/**
* Constructor ( FILE*, const wxString& )
* intializes a DSN lexer and prepares to read from aFile which
* is already open and has aFilename.
*
* @param aKeywordTable is an array of KEYWORDS holding \a aKeywordCount. This
* token table need not contain the lexer separators such as '(' ')', etc.
* @param aKeywordCount is the count of tokens in aKeywordTable.
* @param aFile is an open file, which will be closed when this is destructed.
* @param aFileName is the name of the file
*/
DSNLEXER( const KEYWORD* aKeywordTable, unsigned aKeywordCount,
FILE* aFile, const wxString& aFileName );
/**
* Constructor ( const KEYWORD*, unsigned, const std::string&, const wxString& )
* intializes a DSN lexer and prepares to read from @a aSExpression.
*
* @param aKeywordTable is an array of KEYWORDS holding \a aKeywordCount. This
* token table need not contain the lexer separators such as '(' ')', etc.
* @param aKeywordCount is the count of tokens in aKeywordTable.
* @param aSExpression is text to feed through a STRING_LINE_READER
* @param aSource is a description of aSExpression, used for error reporting.
*/
DSNLEXER( const KEYWORD* aKeywordTable, unsigned aKeywordCount,
const std::string& aSExpression, const wxString& aSource = wxEmptyString );
/**
* Constructor ( const std::string&, const wxString& )
* intializes a DSN lexer and prepares to read from @a aSExpression. Use this
* one without a keyword table with the DOM parser in ptree.h.
*
* @param aSExpression is text to feed through a STRING_LINE_READER
* @param aSource is a description of aSExpression, used for error reporting.
*/
DSNLEXER( const std::string& aSExpression, const wxString& aSource = wxEmptyString );
/**
* Constructor ( LINE_READER* )
* intializes a DSN lexer and prepares to read from @a aLineReader which
* is already open, and may be in use by other DSNLEXERs also. No ownership
* is taken of @a aLineReader. This enables it to be used by other DSNLEXERs also.
*
* @param aKeywordTable is an array of KEYWORDS holding \a aKeywordCount. This
* token table need not contain the lexer separators such as '(' ')', etc.
*
* @param aKeywordCount is the count of tokens in aKeywordTable.
*
* @param aLineReader is any subclassed instance of LINE_READER, such as
* STRING_LINE_READER or FILE_LINE_READER. No ownership is taken.
*/
DSNLEXER( const KEYWORD* aKeywordTable, unsigned aKeywordCount,
LINE_READER* aLineReader = NULL );
virtual ~DSNLEXER();
/**
* Useable only for DSN lexers which share the same LINE_READER
* Synchronizes the pointers handling the data read by the LINE_READER
* Allows 2 DNSLEXER to share the same current line, when switching from a
* DNSLEXER to another DNSLEXER
* @param aLexer = the model
* @return true if the sync can be made ( at least the same line reader )
*/
bool SyncLineReaderWith( DSNLEXER& aLexer );
/**
* Function SetSpecctraMode
* changes the behavior of this lexer into or out of "specctra mode". If
* specctra mode, then:
* 1) stringDelimiter can be changed
* 2) Kicad quoting protocol is not in effect
* 3) space_in_quoted_tokens is functional
* else none of the above are true. The default mode is non-specctra mode, meaning:
* 1) stringDelimiter cannot be changed
* 2) Kicad quoting protocol is in effect
* 3) space_in_quoted_tokens is not functional
*/
void SetSpecctraMode( bool aMode );
/**
* Function PushReader
* manages a stack of LINE_READERs in order to handle nested file inclusion.
* This function pushes aLineReader onto the top of a stack of LINE_READERs and makes
* it the current LINE_READER with its own GetSource(), line number and line text.
* A grammar must be designed such that the "include" token (whatever its various names),
* and any of its parameters are not followed by anything on that same line,
* because PopReader always starts reading from a new line upon returning to
* the original LINE_READER.
*/
void PushReader( LINE_READER* aLineReader );
/**
* Function PopReader
* deletes the top most LINE_READER from an internal stack of LINE_READERs and
* in the case of FILE_LINE_READER this means the associated FILE is closed.
* The most recently used former LINE_READER on the stack becomes the
* current LINE_READER and its previous position in its input stream and the
* its latest line number should pertain. PopReader always starts reading
* from a new line upon returning to the previous LINE_READER. A pop is only
* possible if there are at least 2 LINE_READERs on the stack, since popping
* the last one is not supported.
*
* @return LINE_READER* - is the one that was in use before the pop, or NULL
* if there was not at least two readers on the stack and therefore the
* pop failed.
*/
LINE_READER* PopReader();
// Some functions whose return value is best overloaded to return an enum
// in a derived class.
//-----<overload return values to tokens>------------------------------
/**
* Function NextTok
* returns the next token found in the input file or DSN_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 int - the type of token found next.
* @throw IO_ERROR - only if the LINE_READER throws it.
*/
int 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()
*/
int NeedSYMBOL();
/**
* Function NeedSYMBOLorNUMBER
* calls NextTok() and then verifies that the token read in
* satisfies bool IsSymbol() or tok==DSN_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
*/
int NeedSYMBOLorNUMBER();
/**
* Function NeedNUMBER
* calls NextTok() and then verifies that the token read is type DSN_NUMBER.
* If not, and IO_ERROR is thrown using text from aExpectation.
* @return int - the actual token read in.
* @throw IO_ERROR, if the next token does not satisfy the above test
*/
int NeedNUMBER( const char* aExpectation );
/**
* Function CurTok
* returns whatever NextTok() returned the last time it was called.
*/
int CurTok()
{
return curTok;
}
/**
* Function PrevTok
* returns whatever NextTok() returned the 2nd to last time it was called.
*/
int PrevTok()
{
return prevTok;
}
/**
* Function GetCurStrAsToken
* Used to support "loose" matches (quoted tokens)
*/
int GetCurStrAsToken()
{
return findToken( curText );
}
//-----</overload return values to tokens>-----------------------------
/**
* Function SetStringDelimiter
* changes the string delimiter from the default " to some other character
* and returns the old value.
* @param aStringDelimiter The character in lowest 8 bits.
* @return int - The old delimiter in the lowest 8 bits.
*/
char SetStringDelimiter( char aStringDelimiter )
{
int old = stringDelimiter;
if( specctraMode )
stringDelimiter = aStringDelimiter;
return old;
}
/**
* Function SetSpaceInQuotedTokens
* changes the setting controlling whether a space in a quoted string is
* a terminator.
* @param val If true, means
*/
bool SetSpaceInQuotedTokens( bool val )
{
bool old = space_in_quoted_tokens;
if( specctraMode )
space_in_quoted_tokens = val;
return old;
}
/**
* Function SetCommentsAreTokens
* changes the handling of comments. If set true, comments are returns
* as single line strings with a terminating newline, else they are
* consumed by the lexer and not returned.
*/
bool SetCommentsAreTokens( bool val )
{
bool old = commentsAreTokens;
commentsAreTokens = val;
return old;
}
/**
* Function ReadCommentLines
* checks the next sequence of tokens and reads them into a wxArrayString
* if they are comments. Reading continues until a non-comment token is
* encountered, and such last read token remains as CurTok() and as CurText().
* No push back or "un get" mechanism is used for this support. Upon return
* you simply avoid calling NextTok() for the next token, but rather CurTok().
*
* @return wxArrayString* - heap allocated block of comments, or NULL if none;
* caller owns the allocation and must delete if not NULL.
*/
wxArrayString* ReadCommentLines();
/**
* Function IsSymbol
* tests a token to see if it is a symbol. This means it cannot be a
* special delimiter character such as DSN_LEFT, DSN_RIGHT, DSN_QUOTE, etc. It may
* however, coincidentally match a keyword and still be a symbol.
*/
static bool IsSymbol( int aTok );
/**
* Function Expecting
* throws an IO_ERROR exception with an input file specific error message.
* @param aTok is the token/keyword type which was expected at the current input location.
* @throw IO_ERROR with the location within the input file of the problem.
*/
void Expecting( int aTok );
/**
* Function Expecting
* throws an IO_ERROR exception with an input file specific error message.
* @param aTokenList is the token/keyword type which was expected at the
* current input location, e.g. "pin|graphic|property"
* @throw IO_ERROR with the location within the input file of the problem.
*/
void Expecting( const char* aTokenList );
/**
* Function Unexpected
* throws an IO_ERROR exception with an input file specific error message.
* @param aTok is the token/keyword type which was not expected at the
* current input location.
* @throw IO_ERROR with the location within the input file of the problem.
*/
void Unexpected( int aTok );
/**
* Function Unexpected
* throws an IO_ERROR exception with an input file specific error message.
* @param aToken is the token which was not expected at the
* current input location.
* @throw IO_ERROR with the location within the input file of the problem.
*/
void Unexpected( const char* aToken );
/**
* Function Duplicate
* throws an IO_ERROR exception with a message saying specifically that aTok
* is a duplicate of one already seen in current context.
* @param aTok is the token/keyword type which was not expected at the
* current input location.
* @throw IO_ERROR with the location within the input file of the problem.
*/
void Duplicate( int aTok );
/**
* Function NeedLEFT
* calls NextTok() and then verifies that the token read in is a DSN_LEFT.
* If it is not, an IO_ERROR is thrown.
* @throw IO_ERROR, if the next token is not a DSN_LEFT
*/
void NeedLEFT();
/**
* Function NeedRIGHT
* calls NextTok() and then verifies that the token read in is a DSN_RIGHT.
* If it is not, an IO_ERROR is thrown.
* @throw IO_ERROR, if the next token is not a DSN_RIGHT
*/
void NeedRIGHT();
/**
* Function GetTokenText
* returns the C string representation of a DSN_T value.
*/
const char* GetTokenText( int aTok );
/**
* Function GetTokenString
* returns a quote wrapped wxString representation of a token value.
*/
wxString GetTokenString( int aTok );
static const char* Syntax( int aTok );
/**
* Function CurText
* returns a pointer to the current token's text.
*/
const char* CurText()
{
return curText.c_str();
}
/**
* Function CurStr
* returns a reference to current token in std::string form.
*/
const std::string& CurStr()
{
return curText;
}
/**
* Function FromUTF8
* returns the current token text as a wxString, assuming that the input
* byte stream is UTF8 encoded.
*/
wxString FromUTF8()
{
return wxString::FromUTF8( curText.c_str() );
}
/**
* Function CurLineNumber
* returns the current line number within my LINE_READER
*/
int CurLineNumber()
{
return reader->LineNumber();
}
/**
* Function CurLine
* returns the current line of text, from which the CurText() would return
* its token.
*/
const char* CurLine()
{
return (const char*)(*reader);
}
/**
* Function CurFilename
* returns the current LINE_READER source.
* @return const wxString& - the source of the lines of text,
* e.g. a filename or "clipboard".
*/
const wxString& CurSource()
{
return reader->GetSource();
}
/**
* Function CurOffset
* returns the byte offset within the current line, using a 1 based index.
* @return int - a one based index into the current line.
*/
int CurOffset()
{
return curOffset + 1;
}
};
#endif // DSNLEXER_H_
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