VarExpander.h

/*
 *  VarExpander class interface
 *
 *  This file is part of OTAWA
 *  Copyright (c) 2019, IRIT UPS.
 *
 *  OTAWA 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.
 *
 *  OTAWA 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 OTAWA; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#ifndef ELM_IO_VAREXPANDER_H_
#define ELM_IO_VAREXPANDER_H_
 
#include <elm/string.h>
#include <elm/io/OutStream.h>
#include <elm/avl/Map.h>
 
namespace elm { namespace io {
 
class VarExpander: public OutStream {
public:
    VarExpander();
    VarExpander(OutStream& out);
    inline char escape() const { return esc; }
    inline VarExpander& escape(char e) { esc = e; return *this; }
    inline VarExpander& resetBrace() { open = ""; close = ""; return *this; }
    inline VarExpander& brace(char o, char c)
        { open = open + o; close = close + c; return *this; }
    string expand(string s);
 
    // OutStream overload
    int write(const char *buffer, int size) override;
    int write(char byte) override;
    int flush(void) override;
    CString lastErrorMessage(void) override;
    bool supportsANSI() const override;
 
protected:
    virtual string resolve(string name, bool& record);
 
private:
    char esc;
    string open, close;
    avl::Map<string, string> map;
    enum {
        COPY,
        ESC,
        OPEN,
    } state;
    char expected;
    StringBuffer name;
    OutStream *_out;
};
 
class OSExpander: public VarExpander {
protected:
    string resolve(string name, bool& record) override;
};
 
string expandOSVars(string t);
 
} } // elm::io
 
#endif /* ELM_IO_VAREXPANDER_H_ */