312 lines
8.6 KiB
C++
Executable File
312 lines
8.6 KiB
C++
Executable File
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the
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* Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifndef _CONFTREE_H_
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#define _CONFTREE_H_
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/**
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* A simple configuration file implementation.
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*
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* Configuration files have lines like 'name = value', and/or like '[subkey]'
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*
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* Lines like '[subkeyname]' in the file define subsections, with independant
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* configuration namespaces.
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*
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* Whitespace around name and value is insignificant.
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*
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* Values can be queried for, or set. (the file is then rewritten).
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* The names are case-sensitive but don't count on it either.
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* Any line without a '=' is discarded when rewriting the file.
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* All 'set' calls currently cause an immediate file rewrite.
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*/
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#include <string>
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#include <map>
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#include <list>
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// rh7.3 likes iostream better...
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#if defined(__GNUC__) && __GNUC__ < 3
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#include <iostream>
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#else
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#include <istream>
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#endif
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#ifndef NO_NAMESPACES
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using std::string;
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using std::list;
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using std::map;
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#endif // NO_NAMESPACES
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/**
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* Manages a simple configuration file with subsections.
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*/
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class ConfSimple {
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public:
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enum StatusCode {STATUS_ERROR=0, STATUS_RO=1, STATUS_RW=2};
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/**
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* Build the object by reading content from file.
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* @param filename file to open
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* @param readonly if true open readonly, else rw
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* @param tildexp try tilde (home dir) expansion for subkey values
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*/
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ConfSimple(const char *fname, int readonly = 0, bool tildexp = false);
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/**
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* Build the object by reading content from a string
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* @param data points to the data to parse
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* @param readonly if true open readonly, else rw
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* @param tildexp try tilde (home dir) expansion for subsection names
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*/
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ConfSimple(string *data, int readonly = 0, bool tildexp = false);
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virtual ~ConfSimple() {};
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/**
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* Get value for named parameter, from specified subsection (looks in
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* global space if sk is empty).
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* @return 0 if name not found, 1 else
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*/
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virtual int get(const std::string &name, string &value,
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const string &sk = string(""));
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/* Note: the version returning char* was buggy and has been removed */
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/**
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* Set value for named parameter in specified subsection (or global)
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* @return 0 for error, 1 else
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*/
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virtual int set(const std::string &nm, const std::string &val,
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const std::string &sk);
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virtual int set(const char *name, const char *value, const char *sk = 0);
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/**
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* Remove name and value from config
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*/
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virtual int erase(const std::string &name, const std::string &sk);
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virtual StatusCode getStatus();
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virtual bool ok() {return getStatus() != STATUS_ERROR;}
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/**
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* Walk the configuration values, calling function for each.
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* The function is called with a null nm when changing subsections (the
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* value is then the new subsection name)
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* @return WALK_STOP when/if the callback returns WALK_STOP,
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* WALK_CONTINUE else (got to end of config)
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*/
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enum WalkerCode {WALK_STOP, WALK_CONTINUE};
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virtual WalkerCode sortwalk(WalkerCode
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(*wlkr)(void *cldata, const std::string &nm,
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const std::string &val),
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void *clidata);
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virtual void list();
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/**
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* Return all names in given submap
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*/
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virtual std::list<string> getNames(const string &sk);
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virtual std::string getFilename() {return filename;}
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/**
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* Copy constructor. Expensive but less so than a full rebuild
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*/
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ConfSimple(const ConfSimple &rhs) : data(0) {
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if ((status = rhs.status) == STATUS_ERROR)
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return;
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filename = rhs.filename;
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if (rhs.data) {
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data = new string(*(rhs.data));
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}
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submaps = rhs.submaps;
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}
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/**
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* Assignement. This is expensive
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*/
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ConfSimple& operator=(const ConfSimple &rhs) {
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if (this != &rhs && (status = rhs.status) != STATUS_ERROR) {
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delete data;
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data = 0;
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filename = rhs.filename;
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if (rhs.data) {
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data = new string(*(rhs.data));
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}
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submaps = rhs.submaps;
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}
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return *this;
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}
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protected:
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bool dotildexpand;
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StatusCode status;
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private:
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string filename; // set if we're working with a file
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string *data; // set if we're working with an in-memory string
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map<string, map<string, string> > submaps;
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void parseinput(std::istream &input);
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};
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/**
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* This is a configuration class which attaches tree-like signification to the
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* submap names.
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*
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* If a given variable is not found in the specified section, it will be
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* looked up the tree of section names, and in the global space.
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*
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* submap names should be '/' separated paths (ie: /sub1/sub2). No checking
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* is done, but else the class adds no functionality to ConfSimple.
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*
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* NOTE: contrary to common behaviour, the global or root space is NOT
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* designated by '/' but by '' (empty subkey). A '/' subkey will not
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* be searched at all.
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*/
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class ConfTree : public ConfSimple {
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public:
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/**
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* Build the object by reading content from file.
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*/
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ConfTree(const char *fname, int readonly = 0)
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: ConfSimple(fname, readonly, true) {}
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virtual ~ConfTree() {};
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ConfTree(const ConfTree& r) : ConfSimple(r) {};
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ConfTree& operator=(const ConfTree& r) {
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ConfSimple::operator=(r);
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return *this;
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}
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/**
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* Get value for named parameter, from specified subsection, or its
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* parents.
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* @return 0 if name not found, 1 else
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*/
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virtual int get(const std::string &name, string &value, const string &sk);
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virtual int get(const char *name, string &value, const char *sk) {
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return get(string(name), value, sk ? string(sk) : string(""));
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}
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};
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/**
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* Use several config files, trying to get values from each in order. Used to
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* have a central config, with possible overrides from more specific
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* (ie personal) ones.
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*
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* Notes: it's ok for some of the files in the list to not exist, but the last
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* one must or we generate an error. We open all trees readonly.
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*/
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template <class T> class ConfStack {
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public:
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ConfStack(const std::list<string> &fns, bool ro = true) {
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construct(fns, ro);
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}
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ConfStack(const char *nm, bool ro = true) {
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std::list<string> fns;
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fns.push_back(string(nm));
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construct(fns, ro);
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}
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~ConfStack() {
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erase();
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m_ok = false;
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}
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ConfStack(const ConfStack &rhs) {
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init_from(rhs);
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}
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ConfStack& operator=(const ConfStack &rhs) {
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if (this != &rhs){
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erase();
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m_ok = rhs.m_ok;
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if (m_ok)
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init_from(rhs);
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}
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return *this;
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}
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int get(const std::string &name, string &value, const string &sk) {
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typename std::list<T*>::iterator it;
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for (it = m_confs.begin();it != m_confs.end();it++) {
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if ((*it)->get(name, value, sk))
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return true;
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}
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return false;
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}
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int get(const char *name, string &value, const char *sk) {
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return get(string(name), value, sk ? string(sk) : string(""));
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}
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std::list<string> getNames(const string &sk) {
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std::list<string> nms;
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typename std::list<T*>::iterator it;
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for (it = m_confs.begin();it != m_confs.end();it++) {
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std::list<string> lst;
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lst = (*it)->getNames(sk);
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nms.splice(nms.end(), lst);
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}
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return nms;
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}
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bool ok() {return m_ok;}
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private:
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bool m_ok;
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std::list<T*> m_confs;
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void erase() {
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typename std::list<T*>::iterator it;
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for (it = m_confs.begin();it != m_confs.end();it++) {
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delete (*it);
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}
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m_confs.clear();
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}
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/// Common code to initialize from existing object
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void init_from(const ConfStack &rhs) {
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if ((m_ok = rhs.m_ok)) {
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typename std::list<T*>::const_iterator it;
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for (it = rhs.m_confs.begin();it != rhs.m_confs.end();it++) {
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m_confs.push_back(new T(**it));
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}
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}
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}
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/// Common constructor code
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void construct(const std::list<string> &fns, bool ro) {
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if (!ro) {
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m_ok = false;
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return;
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}
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std::list<std::string>::const_iterator it;
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bool lastok = false;
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for (it = fns.begin();it != fns.end();it++) {
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T* p = new T(it->c_str(), true);
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if (p && p->ok()) {
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m_confs.push_back(p);
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lastok = true;
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} else
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lastok = false;
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}
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m_ok = lastok;
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}
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};
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#endif /*_CONFTREE_H_ */
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