NamedScope.h

/* -*- mode: c++; indent-tabs-mode: nil -*- */
/*
    NamedScope.h
 
    Qore Programming Language
 
    Copyright (C) 2003 - 2022 Qore Technologies, s.r.o.
 
    NamedScopes are children of a program object.  there is a parse
    lock per program object to ensure that objects are added (or backed out)
    atomically per program object.  All the objects referenced here should
    be safe to read & copied at all times.  They will only be deleted when the
    program object is deleted (except the pending structures, which will be
    deleted any time there is a parse error, together with all other
    pending structures)
 
    Permission is hereby granted, free of charge, to any person obtaining a
    copy of this software and associated documentation files (the "Software"),
    to deal in the Software without restriction, including without limitation
    the rights to use, copy, modify, merge, publish, distribute, sublicense,
    and/or sell copies of the Software, and to permit persons to whom the
    Software is furnished to do so, subject to the following conditions:
 
    The above copyright notice and this permission notice shall be included in
    all copies or substantial portions of the Software.
 
    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
    FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
    DEALINGS IN THE SOFTWARE.
 
    Note that the Qore library is released under a choice of three open-source
    licenses: MIT (as above), LGPL 2+, or GPL 2+; see README-LICENSE for more
    information.
*/
 
#ifndef QORE_NAMEDSCOPE_H
 
#define QORE_NAMEDSCOPE_H
 
#include <vector>
#include <string>
 
// for parsing namespace/class scope resolution
class NamedScope {
protected:
    typedef std::vector<std::string> nslist_t;
 
    nslist_t* strlist = nullptr;
    bool del;
 
    DLLLOCAL void init();
 
public:
    char* ostr;
 
    DLLLOCAL NamedScope(char *str) : del(true), ostr(str) {
        assert(str);
        init();
    }
 
    DLLLOCAL NamedScope(const char *str) : del(false), ostr((char *)str) {
        assert(str);
        init();
    }
 
    // takes all values from and deletes the argument
    DLLLOCAL NamedScope(NamedScope* ns) : strlist(ns->strlist), del(ns->del), ostr(ns->ostr) {
        ns->strlist = nullptr;
        ns->ostr = nullptr;
        delete ns;
    }
 
    DLLLOCAL NamedScope(const NamedScope& old) : del(true), ostr(strdup(old.ostr)) {
        if (old.strlist) {
            strlist = new nslist_t(*old.strlist);
        }
        else {
            strlist = nullptr;
        }
    }
 
    DLLLOCAL ~NamedScope() {
        clear();
    }
 
    DLLLOCAL void clear() {
        if (ostr && del)
            free(ostr);
        if (strlist) {
            delete strlist;
            strlist = nullptr;
        }
        ostr = nullptr;
        del = false;
    }
 
    DLLLOCAL const char* getIdentifier() const {
        return strlist ? (*strlist)[strlist->size() - 1].c_str() : ostr;
    }
 
    DLLLOCAL const char* get(unsigned i) const {
        if (!i && !strlist) {
            return ostr;
        }
        assert(strlist);
        assert(i < strlist->size());
        return (*strlist)[i].c_str();
    }
 
    DLLLOCAL const char* operator[](unsigned i) const {
        if (!i && !strlist) {
            return ostr;
        }
        assert(strlist);
        assert(i < strlist->size());
        return (*strlist)[i].c_str();
    }
 
    DLLLOCAL unsigned size() const {
        return strlist ? strlist->size() : 1;
    }
 
    DLLLOCAL NamedScope* copy() const;
    DLLLOCAL void fixBCCall();
 
    DLLLOCAL char* takeName() {
        char *rv = del ? ostr : strdup(ostr);
        ostr = nullptr;
        clear();
        return rv;
    }
 
    DLLLOCAL void optimize() {
        if (!strlist) {
            return;
        }
 
        while (strlist->size() > 1) {
            strlist->erase(strlist->begin());
        }
        if (del) {
            free(ostr);
            del = false;
            ostr = (char*)strlist->back().c_str();
        }
    }
};
 
class ltns {
public:
    DLLLOCAL bool operator()(const NamedScope& s1, const NamedScope& s2) const {
        return strcmp(s1.ostr, s2.ostr) < 0;
    }
};
 
#endif // QORE_NAMEDSCOPE_H