1 | // |
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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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4 | // * * |
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5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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7 | // * conditions of the Geant4 Software License, included in the file * |
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8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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9 | // * include a list of copyright holders. * |
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10 | // * * |
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11 | // * Neither the authors of this software system, nor their employing * |
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12 | // * institutes,nor the agencies providing financial support for this * |
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13 | // * work make any representation or warranty, express or implied, * |
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14 | // * regarding this software system or assume any liability for its * |
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15 | // * use. Please see the license in the file LICENSE and URL above * |
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16 | // * for the full disclaimer and the limitation of liability. * |
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17 | // * * |
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18 | // * This code implementation is the result of the scientific and * |
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19 | // * technical work of the GEANT4 collaboration. * |
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20 | // * By using, copying, modifying or distributing the software (or * |
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21 | // * any work based on the software) you agree to acknowledge its * |
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22 | // * use in resulting scientific publications, and indicate your * |
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23 | // * acceptance of all terms of the Geant4 Software license. * |
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24 | // ******************************************************************** |
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25 | // |
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26 | // |
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27 | // G4UIcmdPargList.cc |
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28 | // |
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29 | // Implementation of a (generic) list argument for G4UIcmdWithPargs |
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30 | // |
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31 | |
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32 | #include "G4UIcmdPargList.hh" |
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33 | |
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34 | #include <sstream> |
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35 | #include <iomanip> |
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36 | |
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37 | // |
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38 | // Constructor |
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39 | // |
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40 | G4UIcmdPargList::G4UIcmdPargList( const G4String &theName, G4int theMaxItem ) |
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41 | : G4UIcmdParg( theName ) |
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42 | { |
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43 | nItem = 0; |
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44 | maxItem = theMaxItem; |
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45 | } |
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46 | |
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47 | |
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48 | // |
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49 | // Fetch argument value from input stream |
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50 | // |
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51 | std::istream &G4UIcmdPargList::FetchValue( std::istream &istr ) |
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52 | { |
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53 | // |
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54 | // Because of limitations of G4UIcommand, we must avoid |
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55 | // requiring any spaces. |
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56 | // |
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57 | // Require '(' to be the leading character, and read in |
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58 | // character strings until ',' or ')' are found. If the |
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59 | // latter is found, input is terminated. |
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60 | // |
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61 | // In actual usage, we expect leading blanks to be removed |
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62 | // before this method is invoked, |
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63 | // but there is no need to assume that. |
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64 | // |
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65 | // Notice that blank items are allowed. It is up to decendent |
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66 | // classes to decide what to do in this case. To allow an |
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67 | // empty list (i.e. no items, nItem==0), the special symbol |
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68 | // "-" is reserved. |
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69 | // |
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70 | char buffer[256]; // Buffer for each item |
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71 | char a; // Single character input |
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72 | |
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73 | // |
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74 | // Remove leading blanks |
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75 | // |
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76 | do { |
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77 | istr.get(a); |
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78 | if (istr.fail()) return istr; |
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79 | } while( a == ' ' ); |
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80 | |
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81 | // |
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82 | // Check for empty list ( '-', followed by EOF or blank) |
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83 | // |
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84 | if (a == '-') { |
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85 | istr.get(a); |
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86 | if (istr.fail() || a == ' ') { |
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87 | nItem = 0; |
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88 | return istr; |
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89 | } |
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90 | } |
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91 | |
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92 | |
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93 | // |
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94 | // Otherwise: Insist argument begin with a '(' |
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95 | // |
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96 | if (a != '(') { |
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97 | G4cerr << "Listed argument must begin with '(' or consist of only '-'" << G4endl; |
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98 | istr.clear(std::ios::failbit|istr.rdstate()); // Is there a better way to do this??? |
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99 | return istr; |
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100 | } |
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101 | |
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102 | // |
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103 | // Loop over items in argument |
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104 | // |
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105 | G4int nItemFetched = 0; |
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106 | do { |
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107 | // |
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108 | // Next item |
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109 | // |
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110 | char *b = buffer; |
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111 | for(;;) { |
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112 | // |
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113 | // Next character |
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114 | // |
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115 | istr.get(*b); |
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116 | if (istr.fail()) return istr; |
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117 | |
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118 | // |
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119 | // Check for delimiter |
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120 | // |
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121 | if (*b == ',' || *b == ')') { |
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122 | a = *b; // Remember |
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123 | *b = '\0'; |
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124 | break; |
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125 | } |
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126 | |
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127 | // |
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128 | // Go to next character |
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129 | // |
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130 | if (++b > buffer+255) { |
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131 | G4cerr << "Listed argument item must be less than 255 characters" << G4endl; |
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132 | istr.clear(std::ios::failbit|istr.rdstate()); |
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133 | return istr; |
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134 | } |
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135 | } |
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136 | |
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137 | // |
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138 | // Interpret |
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139 | // |
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140 | if (nItemFetched >= maxItem) { |
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141 | G4cerr << "Maximum of " << maxItem << " items exceeded in listed argument" << G4endl; |
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142 | istr.clear(std::ios::failbit|istr.rdstate()); |
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143 | return istr; |
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144 | } |
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145 | |
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146 | if (!FetchItem( buffer, nItemFetched++ )) { |
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147 | istr.clear(std::ios::failbit|istr.rdstate()); |
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148 | return istr; |
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149 | } |
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150 | } while( a == ',' ); |
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151 | |
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152 | // |
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153 | // Set nItem only on success |
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154 | // |
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155 | nItem = nItemFetched; |
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156 | |
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157 | return istr; |
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158 | } |
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159 | |
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160 | |
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161 | // |
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162 | // ConvertToString |
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163 | // |
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164 | G4String G4UIcmdPargList::ConvertToString() |
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165 | { |
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166 | // |
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167 | // Empty case |
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168 | // |
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169 | if (nItem == 0) return "-"; |
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170 | |
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171 | // |
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172 | // Allocate a buffer, big enough to hold all items plus |
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173 | // a command and '()'. Each item is allowed to take 255 |
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174 | // characters. |
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175 | // |
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176 | // buffSize = 255*nItem+4; |
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177 | |
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178 | std::ostringstream os; |
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179 | |
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180 | // |
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181 | // Write out everything in turn |
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182 | // |
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183 | os << '('; |
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184 | |
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185 | G4int item; |
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186 | for( item=0; item<nItem; item++) { |
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187 | if (item) os << ','; |
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188 | if (!WriteItem(os,item)) return "(error)"; |
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189 | } |
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190 | |
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191 | os << ')'; |
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192 | |
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193 | // |
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194 | // Convert to G4String |
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195 | // |
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196 | G4String answer = os.str(); |
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197 | |
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198 | // |
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199 | // Return G4String |
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200 | // |
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201 | return answer; |
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202 | } |
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