1 | #include <fstream.hfa> |
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2 | #include <parseargs.hfa> |
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3 | #include <stdlib.hfa> |
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4 | #include <string.h> |
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5 | #include "parseconfig.hfa" |
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6 | |
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7 | |
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8 | // *********************************** exceptions *********************************** |
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9 | |
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10 | |
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11 | static vtable(Parse_Failure) Parse_Failure_vt; |
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12 | |
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13 | void ?{}( Parse_Failure & this ) with ( this ) { |
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14 | virtual_table = &Parse_Failure_vt; |
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15 | } |
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16 | |
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17 | static vtable(Validation_Failure) Validation_Failure_vt; |
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18 | |
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19 | void ?{}( Validation_Failure & this ) with ( this ) { |
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20 | virtual_table = &Validation_Failure_vt; |
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21 | } |
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22 | |
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23 | |
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24 | // *********************************** main code *********************************** |
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25 | |
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26 | |
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27 | struct KVPairs { |
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28 | size_t size, max_size; |
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29 | * [ char *, char * ] data; |
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30 | }; |
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31 | |
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32 | void ?{}( KVPairs & kvp ) with ( kvp ) { // default constructor |
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33 | size = 0; max_size = 0; data = 0p; |
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34 | } |
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35 | |
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36 | void ?{}( KVPairs & kvp, size_t size ) { // initialization |
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37 | kvp.[ size, max_size ] = [ 0, size ]; |
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38 | kvp.data = alloc( size ); |
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39 | } |
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40 | |
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41 | void ^?{}( KVPairs & kvp ) with ( kvp ) { // destructor |
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42 | for ( i; size ) free( data[i] ); |
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43 | free( data ); |
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44 | size = 0; max_size = 0; data = 0p; |
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45 | } |
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46 | |
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47 | void add_kv_pair( KVPairs & kv_pairs, char * k, char * v ) with ( kv_pairs ) { |
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48 | if ( max_size == 0 ) { |
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49 | max_size = 1; |
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50 | data = alloc( max_size ); |
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51 | } else if ( size == max_size ) { |
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52 | max_size *= 2; |
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53 | data = alloc( max_size, data`realloc ); |
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54 | } |
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55 | |
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56 | data[size].0 = alloc( strlen( k ) ); |
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57 | data[size].1 = alloc( strlen( v ) ); |
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58 | strcpy( data[size].0, k ); |
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59 | strcpy( data[size].1, v ); |
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60 | ++size; |
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61 | } |
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62 | |
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63 | |
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64 | bool comments( ifstream & in, char name[] ) { |
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65 | while () { |
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66 | in | name; |
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67 | if ( eof( in ) ) return true; |
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68 | if ( name[0] != '#' ) return false; |
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69 | in | nl; // ignore remainder of line |
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70 | } // while |
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71 | } // comments |
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72 | |
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73 | // Parse configuration from a file formatted in shell style |
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74 | KVPairs * parse_tabular_config_format( const char * config_file, size_t num_entries ) { |
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75 | * KVPairs kv_pairs = new( num_entries ); |
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76 | |
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77 | ifstream in; |
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78 | try { |
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79 | open( in, config_file ); // open the configuration file for input |
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80 | |
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81 | char key[64]; |
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82 | char value[256]; |
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83 | |
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84 | while () { // parameter names can appear in any order |
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85 | // Must add check to see if already read in a key-value pair, |
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86 | // once we switch to using hash table as intermediate storage |
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87 | if ( comments( in, key ) ) break; // eof ? |
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88 | in | value; |
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89 | |
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90 | add_kv_pair( *kv_pairs, key, value ); |
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91 | |
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92 | if ( eof( in ) ) break; |
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93 | in | nl; // ignore remainder of line |
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94 | } // for |
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95 | } catch( Open_Failure * ex; ex->istream == &in ) { |
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96 | delete( kv_pairs ); |
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97 | serr | "Error: could not open input file '" | config_file | "'"; |
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98 | throw *ex; |
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99 | } // try |
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100 | close( in ); |
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101 | |
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102 | return kv_pairs; |
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103 | } |
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104 | |
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105 | // Parse configuration values from intermediate format |
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106 | void parse_config( const char * config_file, config_entry entries[], size_t num_entries, config_format format ) { |
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107 | KVPairs * kv_pairs = 0p; |
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108 | choose ( format ) { |
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109 | case TABULAR_CONFIG: |
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110 | kv_pairs = parse_tabular_config_format( config_file, num_entries ); |
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111 | } |
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112 | |
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113 | int entries_so_far = 0; |
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114 | for ( i; kv_pairs->size ) { |
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115 | if ( entries_so_far == num_entries ) break; |
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116 | |
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117 | char * src_key, * src_value; |
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118 | [ src_key, src_value ] = kv_pairs->data[i]; |
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119 | |
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120 | for ( j; num_entries ) { |
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121 | if ( strcmp( src_key, entries[j].key ) != 0 ) continue; |
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122 | if ( !entries[j].parse( src_value, entries[j].variable ) ) { |
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123 | delete( kv_pairs ); |
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124 | serr | "Error: value '" | src_value | "' for key '" | src_key | "' could not be parsed"; |
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125 | throw (Parse_Failure){}; |
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126 | } |
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127 | |
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128 | // Validate the parsed data, if necessary |
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129 | if ( entries[j].validate != (bool (*)(void *))0p |
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130 | && !entries[j].validate( entries[j].variable ) ) { |
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131 | delete( kv_pairs ); |
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132 | serr | "Error: config value at key '" | entries[j].key | "' did not pass validation"; |
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133 | throw (Validation_Failure){}; |
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134 | } |
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135 | |
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136 | ++entries_so_far; |
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137 | |
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138 | break; |
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139 | } |
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140 | } |
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141 | |
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142 | delete( kv_pairs ); |
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143 | } // processConfigFile |
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144 | |
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145 | |
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146 | // *********************************** validation *********************************** |
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147 | |
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148 | |
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149 | forall(T | Relational( T )) |
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150 | bool is_nonnegative( T & value ) { |
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151 | T zero_val = 0; |
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152 | return value >= zero_val; |
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153 | } |
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154 | |
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155 | forall(T | Relational( T )) |
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156 | bool is_positive( T & value ) { |
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157 | T zero_val = 0; |
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158 | return value > zero_val; |
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159 | } |
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160 | |
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161 | forall(T | Relational( T )) |
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162 | bool is_nonpositive( T & value ) { |
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163 | T zero_val = 0; |
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164 | return value <= zero_val; |
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165 | } |
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166 | |
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167 | forall(T | Relational( T )) |
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168 | bool is_negative( T & value ) { |
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169 | T zero_val = 0; |
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170 | return value < zero_val; |
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171 | } |
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172 | |
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173 | |
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174 | // Local Variables: // |
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175 | // tab-width: 4 // |
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176 | // compile-command: "cfa parseconfig.cfa" // |
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177 | // End: // |
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