1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
|
// ConfigFile.cpp
#include "ConfigFile.h"
using std::string;
ConfigFile::ConfigFile( string filename, string delimiter,
string comment, string sentry )
: myDelimiter(delimiter), myComment(comment), mySentry(sentry)
{
// Construct a ConfigFile, getting keys and values from given file
std::ifstream in( filename.c_str() );
if( !in ) throw file_not_found( filename );
in >> (*this);
}
ConfigFile::ConfigFile()
: myDelimiter( string(1,'=') ), myComment( string(1,'#') )
{
// Construct a ConfigFile without a file; empty
}
void ConfigFile::remove( const string& key )
{
// Remove key and its value
myContents.erase( myContents.find( key ) );
return;
}
bool ConfigFile::keyExists( const string& key ) const
{
// Indicate whether key is found
mapci p = myContents.find( key );
return ( p != myContents.end() );
}
/* static */
void ConfigFile::trim( string& s )
{
// Remove leading and trailing whitespace
static const char whitespace[] = " \n\t\v\r\f";
s.erase( 0, s.find_first_not_of(whitespace) );
s.erase( s.find_last_not_of(whitespace) + 1U );
}
std::ostream& operator<<( std::ostream& os, const ConfigFile& cf )
{
// Save a ConfigFile to os
for( ConfigFile::mapci p = cf.myContents.begin();
p != cf.myContents.end();
++p )
{
os << p->first << " " << cf.myDelimiter << " ";
os << p->second << std::endl;
}
return os;
}
std::istream& operator>>( std::istream& is, ConfigFile& cf )
{
// Load a ConfigFile from is
// Read in keys and values, keeping internal whitespace
typedef string::size_type pos;
const string& delim = cf.myDelimiter; // separator
const string& comm = cf.myComment; // comment
const string& sentry = cf.mySentry; // end of file sentry
const pos skip = delim.length(); // length of separator
string nextline = ""; // might need to read ahead to see where value ends
while( is || nextline.length() > 0 )
{
// Read an entire line at a time
string line;
if( nextline.length() > 0 )
{
line = nextline; // we read ahead; use it now
nextline = "";
}
else
{
std::getline( is, line );
}
// Ignore comments
line = line.substr( 0, line.find(comm) );
// Check for end of file sentry
if( sentry != "" && line.find(sentry) != string::npos ) return is;
// Parse the line if it contains a delimiter
pos delimPos = line.find( delim );
if( delimPos < string::npos )
{
// Extract the key
string key = line.substr( 0, delimPos );
line.replace( 0, delimPos+skip, "" );
// See if value continues on the next line
// Stop at blank line, next line with a key, end of stream,
// or end of file sentry
bool terminate = false;
while( !terminate && is )
{
std::getline( is, nextline );
terminate = true;
string nlcopy = nextline;
ConfigFile::trim(nlcopy);
if( nlcopy == "" ) continue;
nextline = nextline.substr( 0, nextline.find(comm) );
if( nextline.find(delim) != string::npos )
continue;
if( sentry != "" && nextline.find(sentry) != string::npos )
continue;
nlcopy = nextline;
ConfigFile::trim(nlcopy);
if( nlcopy != "" ) line += "\n";
line += nextline;
terminate = false;
}
// Store key and value
ConfigFile::trim(key);
ConfigFile::trim(line);
cf.myContents[key] = line; // overwrites if key is repeated
}
}
return is;
}
|
