Developer Documentation

NumberParsing.cc
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41
42 #include "NumberParsing.hh"
43 #include <cmath>
44 #include <sstream>
45
46 namespace Utils
47 {
48
49 float getFloat(QTextStream &_source)
50 {
51 QString rawNumber;
52 _source >> rawNumber;
53 //decimal part > 0
54 float highPart = 0.0f;
55 //decimal part < 0
56 float lowPart = 0.0f;
57 //sign of the decimal
58 float sign = 1.0;
59 //counter to concatenate high and lowaprt
60 int n = 0;
61
62 QString::Iterator it = rawNumber.begin();
63 QString::Iterator end = rawNumber.end();
64 if(*it == QLatin1Char('-'))
65 {
66 //we have a negative float
67 sign = sign * -1.0;
68 ++it;
69 }
70
71 for (;it != end;++it)
72 {
73 //we have read a digit
74 if(it->isDigit())
75 {
76 highPart *=10;
77 highPart += it->digitValue();
78 }
79 else
80 {
81 //stop counting the highPart if its not a digit
82 ++it;
83 break;
84 }
85 }
86
87 for (;it != end;++it)
88 {
89 //we assume to have read a digit
90 if(it->isDigit())
91 {
92 lowPart *=10;
93 lowPart += it->digitValue();
94 ++n;
95 }
96 else
97 {
98 //stop counting the highPart dont increment here!
99 // otherwise we cant detect if we successful converted
100 break;
101 }
102 }
103 // if something went wrong during decoding use the standard decoding
104 if(it != end)
105 {
106 return rawNumber.toFloat();
107 }
108 return sign * (highPart + lowPart / std::pow(10.0,n));
109 }
110
111 float getFloat(std::istream &_source)
112 {
113 std::string rawNumber;
114 _source >> rawNumber;
115
116 //decimal part > 0
117 float highPart = 0.0f;
118 //decimal part < 0
119 float lowPart = 0.0f;
120 //sign of the decimal
121 float sign = 1.0;
122 //counter to concatenate high and lowaprt
123 int n = 0;
124
125 std::string::iterator it = rawNumber.begin();
126 std::string::iterator end = rawNumber.end();
127 if(*it == '-')
128 {
129 //we have a negative float
130 sign = sign * -1.0;
131 ++it;
132 }
133
134 for (;it != end;++it)
135 {
136 //we have read a digit
137 if(isdigit(*it))
138 {
139 highPart *=10;
140 highPart += (int)(*it - '0');
141 }
142 else
143 {
144 //stop counting the highPart if its not a digit
145 ++it;
146 break;
147 }
148 }
149
150 for (;it != end;++it)
151 {
152 //we assume to have read a digit
153 if(isdigit(*it))
154 {
155 lowPart *=10;
156 lowPart += (int)(*it - '0');
157 ++n;
158 }
159 else
160 {
161 //stop counting the highPart dont increment here!
162 // otherwise we cant detect if we successful converted
163 break;
164 }
165 }
166 // if something went wrong during decoding use the standard decoding
167 if(it != end)
168 {
169 float fallback;
170 std::stringstream converter;
171 converter<<rawNumber;
172 converter>>fallback;
173 return fallback;
174 }
175 return sign * (highPart + lowPart / std::pow(10.0,n));
176 }
177
178 double getDouble(QTextStream &_source)
179 {
180 QString rawNumber;
181 _source >> rawNumber;
182 //decimal part > 0
183 double highPart = 0.0f;
184 //decimal part < 0
185 double lowPart = 0.0f;
186 //sign of the decimal
187 double sign = 1.0;
188 //counter to concatenate high and lowaprt
189 int n = 0;
190
191 QString::Iterator it = rawNumber.begin();
192 QString::Iterator end = rawNumber.end();
193 if(*it == QLatin1Char('-'))
194 {
195 //we have a negative float
196 sign = sign * -1.0;
197 ++it;
198 }
199
200 for (;it != end;++it)
201 {
202 //we have read a digit
203 if(it->isDigit())
204 {
205 highPart *=10;
206 highPart += it->digitValue();
207 }
208 else
209 {
210 //stop counting the highPart if its not a digit
211 ++it;
212 break;
213 }
214 }
215
216 for (;it != end;++it)
217 {
218 //we assume to have read a digit
219 if(it->isDigit())
220 {
221 lowPart *=10;
222 lowPart += it->digitValue();
223 ++n;
224 }
225 else
226 {
227 //stop counting the highPart dont increment here!
228 // otherwise we cant detect if we successful converted
229 break;
230 }
231 }
232 // if something went wrong during decoding use the standard decoding
233 if(it != end)
234 {
235 return rawNumber.toDouble();
236 }
237 return sign * (highPart + lowPart / std::pow(10.0,n));
238 }
239 }
Utils
Definition: NumberParsing.cc:46
NumberParsing.hh