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// -*- C++ -*-
// Generalized simple lexical analizer.
// It can be used for simple syntax parsers, like lyxrc,
// texclass and others to come. [asierra30/03/96]
//
// (C) 1996 Lyx Team.
#ifndef _LYXLEX_H
#define _LYXLEX_H
#ifdef __GNUG__
#pragma interface
#endif
#include <stdio.h>
#include "LString.h"
///
struct keyword_item {
///
char const* tag;
///
short code;
};
/*@Doc:
Generalized simple lexical analizer.
It can be used for simple syntax parsers, like lyxrc,
texclass and others to come.
See lyxrc.C for an example of usage.
*/
class LyXLex {
public:
///
LyXLex (keyword_item*, int);
///
~LyXLex() { if (file && owns_file) fclose(file); };
/// Lex basic codes
enum {
///
LEX_UNDEF = -1,
///
LEX_FEOF = -2,
///
LEX_DATA = -3,
///
LEX_TOKEN = -4
};
/// file is open and end of file is not reached
bool IsOK();
/// return true if able to open file, else false
bool setFile(LString const & filename);
/// if file is already read from, line numbers will be wrong.
// should be removed
void setFile(FILE *f);
///
// should be removed
FILE *getFile() { return file; }
/// Danger! Don't use it unless you know what you are doing.
void setLineNo(int l) { lineno = l; }
/// returns a lex code
int lex();
/** Just read athe next word. If esc is true remember that
some chars might be escaped: "\ atleast */
bool next(bool esc = false);
/** Read next token. This one is almost the same as next,
but it will consider " as a regular character and always
split a word if it contains a backslash.
*/
bool nextToken();
///
int GetLineNo() { return lineno; }
///
int GetInteger();
///
bool GetBool();
///
float GetFloat();
///
LString GetString() const;
/// get a long string, ended by the tag `endtag'
LString getLongString(LString const &endtoken);
///
bool EatLine();
///
int FindToken(char const* string[]);
///
int CheckToken(char const* string[], int print_error);
///
char const *text() const { return &buff[0]; }
/** Pushes a token list on a stack and replaces it with a new one.
*/
void pushTable(keyword_item*, int);
/** Pops a token list into void and replaces it with the one now
on top of the stack.
*/
void popTable();
/** Prints an error message with the corresponding line number
and file name. If message contains the substring `$$Token',
it is replaced with the value of GetString()
*/
void printError(LString const & message);
/**
Prints the current token table on stderr.
*/
void printTable();
protected:
///
enum {
///
LEX_MAX_BUFF = 2048
};
///
struct pushed_table {
///
pushed_table(){
next=NULL;
table_elem=NULL;
}
///
pushed_table *next;
///
keyword_item *table_elem;
///
int table_siz;
};
///
FILE *file;
///
bool owns_file;
///
LString name;
///
int lineno;
///
keyword_item *table;
///
int no_items;
///
char buff[LEX_MAX_BUFF];
///
pushed_table *pushed;
///
int search_kw(char const * const) const;
///
short status;
};
inline
bool LyXLex::IsOK()
{
return (file && !feof(file));
}
#endif
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