JString.h

00001 /***************************************************************************
00002 *cr
00003 *cr (C) Copyright 1995-2019 The Board of Trustees of the
00004 *cr University of Illinois
00005 *cr All Rights Reserved
00006 *cr
00007 ***************************************************************************/
00008 
00009 /***************************************************************************
00010 * RCS INFORMATION:
00011 *
00012 * $RCSfile: JString.h,v $
00013 * $Author: johns $ $Locker: $ $State: Exp $
00014 * $Revision: 1.22 $ $Date: 2019年01月17日 21:20:59 $
00015 *
00016 ***************************************************************************
00017 * DESCRIPTION:
00018 * A minimalistic string class we use instead of similar classes from the
00019 * STL or the GNU libraries for better portability and greatly reduced
00020 * code size. (only implements the functionality we actually need, doesn't
00021 * balloon the entire VMD binary as some past string class implementations
00022 * did). Implements regular expression matching methods used by VMD.
00023 ***************************************************************************/
00024 
00025 #ifndef JSTRING_H__
00026 #define JSTRING_H__
00027 
00028 #include <string.h>
00029 
00035 class JString {
00036 private:
00037 static char *defstr;
00038 char *rep;
00039 int do_free;
00040 
00041 public:
00042 JString()
00043 : rep(defstr), do_free(0) {} 
00044 
00045 JString(const char *str)
00046 : rep(defstr), do_free(0) {
00047 if (str) {
00048 rep = new char[strlen(str)+1];
00049 strcpy(rep, str);
00050 do_free = 1;
00051 }
00052 }
00053 JString(const JString& s) {
00054 rep = new char[strlen(s.rep)+1];
00055 strcpy(rep, s.rep);
00056 do_free = 1;
00057 }
00058 ~JString() { if (do_free) delete [] rep; }
00059 
00060 int operator==(const char *s) {return !strcmp(s,rep);}
00061 int operator!=(const char *s) {return strcmp(s,rep);}
00062 int operator<(const char *s) {return (strcmp(s,rep)<0);}
00063 int operator>(const char *s) {return (strcmp(s,rep)>0);}
00064 int operator<=(const char *s) {return (strcmp(s,rep)<=0);}
00065 int operator>=(const char *s) {return (strcmp(s,rep)>=0);}
00066 
00067 JString& operator=(const char *);
00068 JString& operator=(const JString&);
00069 JString& operator=(const char);
00070 JString& operator+=(const char *);
00071 JString& operator+=(const JString&);
00072 JString& operator+=(const char);
00073 
00074 friend int compare(const JString& s1, const JString& s2) {
00075 return strcmp(s1.rep, s2.rep);
00076 }
00077 
00078 friend JString operator+(const char*, const JString&);
00079 JString operator+(const JString&) const;
00080 
00081 int length() const { return (int) strlen(rep); }
00082 
00083 operator const char *() const {return rep; }
00084 
00085 // convert to uppercase
00086 void upcase();
00087 
00088 // convert to camel case (only first letter capitalized)
00089 void to_camel();
00090 
00091 // Replace all instances of pat with repl
00092 int gsub(const char *pat, const char *repl);
00093 
00094 // remove the last n non-NULL characters from the end of the string
00095 void chop(int n);
00096 };
00097 
00098 #endif
00099