include/stringclass.h

   1 // -*- C++ -*-
   2 /* Copyright (C) 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
   3      Written by James Clark (jjc@jclark.com)
   4
   5 This file is part of groff.
   6
   7 groff is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 2, or (at your option) any later
  10 version.
  11
  12 groff is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License along
  18 with groff; see the file COPYING.  If not, write to the Free Software
  19 Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
  20
  21 #include <string.h>
  22 #include <stdio.h>
  23 #include <assert.h>
  24
  25 class string {
  26 public:
  27   string();
  28   string(const string &);
  29   string(const char *);
  30   string(const char *, int);
  31   string(char);
  32
  33   ~string();
  34
  35   string &operator=(const string &);
  36   string &operator=(const char *);
  37   string &operator=(char);
  38
  39   string &operator+=(const string &);
  40   string &operator+=(const char *);
  41   string &operator+=(char);
  42   void append(const char *, int);
  43
  44   int length() const;
  45   int empty() const;
  46   int operator*() const;
  47
  48   string substring(int i, int n) const;
  49
  50   char &operator[](int);
  51   char operator[](int) const;
  52
  53   void set_length(int i);
  54   const char *contents() const;
  55   int search(char) const;
  56   char *extract() const;
  57   void clear();
  58   void move(string &);
  59
  60   friend string operator+(const string &, const string &);
  61   friend string operator+(const string &, const char *);
  62   friend string operator+(const char *, const string &);
  63   friend string operator+(const string &, char);
  64   friend string operator+(char, const string &);
  65
  66   friend int operator==(const string &, const string &);
  67   friend int operator!=(const string &, const string &);
  68   friend int operator<=(const string &, const string &);
  69   friend int operator<(const string &, const string &);
  70   friend int operator>=(const string &, const string &);
  71   friend int operator>(const string &, const string &);
  72
  73 private:
  74   char *ptr;
  75   int len;
  76   int sz;
  77
  78   string(const char *, int, const char *, int); // for use by operator+
  79   void grow1();
  80 };
  81
  82
  83 inline char &string::operator[](int i)
  84 {
  85   assert(i >= 0 && i < len);
  86   return ptr[i];
  87 }
  88
  89 inline char string::operator[](int i) const
  90 {
  91   assert(i >= 0 && i < len);
  92   return ptr[i];
  93 }
  94
  95 inline int string::length() const
  96 {
  97   return len;
  98 }
  99
 100 inline int string::empty() const
 101 {
 102   return len == 0;
 103 }
 104
 105 inline int string::operator*() const
 106 {
 107   return len;
 108 }
 109
 110 inline const char *string::contents() const
 111 {
 112   return  ptr;
 113 }
 114
 115 inline string operator+(const string &s1, const string &s2)
 116 {
 117   return string(s1.ptr, s1.len, s2.ptr, s2.len);
 118 }
 119
 120 inline string operator+(const string &s1, const char *s2)
 121 {
 122   if (s2 == 0)
 123     return s1;
 124   else
 125     return string(s1.ptr, s1.len, s2, strlen(s2));
 126 }
 127
 128 inline string operator+(const char *s1, const string &s2)
 129 {
 130   if (s1 == 0)
 131     return s2;
 132   else
 133     return string(s1, strlen(s1), s2.ptr, s2.len);
 134 }
 135
 136 inline string operator+(const string &s, char c)
 137 {
 138   return string(s.ptr, s.len, &c, 1);
 139 }
 140
 141 inline string operator+(char c, const string &s)
 142 {
 143   return string(&c, 1, s.ptr, s.len);
 144 }
 145
 146 inline int operator==(const string &s1, const string &s2)
 147 {
 148   return (s1.len == s2.len
 149           && (s1.len == 0 || memcmp(s1.ptr, s2.ptr, s1.len) == 0));
 150 }
 151
 152 inline int operator!=(const string &s1, const string &s2)
 153 {
 154   return (s1.len != s2.len
 155           || (s1.len != 0 && memcmp(s1.ptr, s2.ptr, s1.len) != 0));
 156 }
 157
 158 inline string string::substring(int i, int n) const
 159 {
 160   assert(i >= 0 && i + n <= len);
 161   return string(ptr + i, n);
 162 }
 163
 164 inline string &string::operator+=(char c)
 165 {
 166   if (len >= sz)
 167     grow1();
 168   ptr[len++] = c;
 169   return *this;
 170 }
 171
 172 void put_string(const string &, FILE *);
 173
 174 string as_string(int);