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 | EHM_VIRTUAL_TABLE(Validation_Failure, Validation_Failure_main_table); |
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12 | void ?{}( Validation_Failure & this, config_entry & entry ) with ( entry ) { |
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13 | this.virtual_table = &Validation_Failure_main_table; |
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14 | this.key = key; |
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15 | this.variable = variable; |
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16 | } |
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17 | void throwValidation_Failure( config_entry & entry ) { |
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18 | Validation_Failure exc = { entry }; |
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19 | } |
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20 | |
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21 | |
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22 | // *********************************** main code *********************************** |
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23 | |
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24 | |
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25 | struct KVPairs { |
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26 | int size, max_size; |
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27 | * [ char *, char * ] data; |
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28 | }; |
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29 | void ?{}( KVPairs & kvp ) with ( kvp ) { // default constructor |
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30 | size = 0; max_size = 0; data = 0p; |
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31 | } |
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32 | void ?{}( KVPairs & kvp, int size ) { // initialization |
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33 | kvp.[ size, max_size ] = [ 0, size ]; |
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34 | kvp.data = alloc( size ); |
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35 | } |
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36 | /* |
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37 | void ?{}( KVPairs & kvp, KVPairs val ) with( val ) { // copy, deep |
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38 | kvp.[ size, max_size ] = [ size, max_size ]; |
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39 | kvp.data = alloc( size, data ); |
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40 | } |
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41 | */ |
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42 | void ^?{}( KVPairs & kvp ) with ( kvp ) { // destructor |
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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 ( size == max_size ) { |
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49 | max_size *= 2; |
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50 | data = resize( data, max_size ); |
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51 | } |
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52 | |
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53 | data[size] = [ k, v ]; |
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54 | ++size; |
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55 | } |
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56 | |
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57 | |
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58 | struct StringBuilder { |
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59 | int size, max_size; |
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60 | * char string; |
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61 | }; |
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62 | void ?{}( StringBuilder & sb ) with ( sb ) { // default constructor |
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63 | size = 1; max_size = 1; string = alloc( 1 ); |
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64 | string[0] = '\0'; |
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65 | } |
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66 | void ?{}( StringBuilder & sb, int size ) { // initialization |
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67 | sb.[ size, max_size ] = [ 1, size+1 ]; |
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68 | sb.string = alloc( size ); |
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69 | sb.string[0] = '\0'; |
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70 | } |
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71 | void ^?{}( StringBuilder & sb ) with ( sb ) { // destructor |
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72 | free( string ); |
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73 | size = 0; max_size = 0; string = 0p; |
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74 | } |
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75 | |
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76 | void add_char( StringBuilder & sb, char c ) with ( sb ) { |
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77 | if ( size == max_size ) { |
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78 | max_size *= 2; |
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79 | string = resize( string, max_size ); |
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80 | } |
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81 | |
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82 | string[size-1] = c; |
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83 | string[size] = '\0'; |
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84 | ++size; |
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85 | } |
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86 | |
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87 | |
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88 | bool comments( ifstream & in, char * name ) { |
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89 | StringBuilder sb; |
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90 | |
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91 | char c; |
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92 | while () { |
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93 | in | c; |
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94 | add_char( sb, c ); |
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95 | |
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96 | if ( fail( in ) ) { |
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97 | name = alloc( sb.size ); |
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98 | strcpy( name, sb.string ); |
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99 | |
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100 | return true; |
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101 | } |
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102 | if ( c != '#' ) break; |
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103 | in | nl; // ignore remainder of line |
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104 | } // for |
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105 | |
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106 | name = alloc( sb.size ); |
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107 | strcpy( name, sb.string ); |
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108 | |
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109 | return false; |
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110 | } // comments |
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111 | |
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112 | // Parse configuration from a file formatted in shell style |
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113 | KVPairs & parse_tabular_config_format( const char * config_file, size_t num_entries ) { |
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114 | // * KVPairs kv_pairs; |
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115 | KVPairs kv_pairs = { num_entries }; |
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116 | |
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117 | ifstream in; |
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118 | try { |
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119 | open( in, config_file ); // open the configuration file for input |
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120 | |
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121 | while () { |
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122 | // * char key; |
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123 | // * char value; |
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124 | // if ( comments( in, key ) ) break; // eof ? |
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125 | |
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126 | // THE CODE BELOW IS TEMPORARY, TO TRY AND GET SOMETHING WORKING |
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127 | |
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128 | // Right now doesn't handle duplicate keys. Should use hashmap for that |
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129 | char c; |
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130 | StringBuilder key_sb; |
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131 | StringBuilder value_sb; |
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132 | |
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133 | // Doesn't handle comments |
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134 | while () { |
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135 | in | c; |
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136 | if ( c == ' ' ) { |
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137 | while ( c == ' ' ) in | c; |
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138 | } else { |
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139 | add_char( key_sb, c ); |
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140 | } |
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141 | } |
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142 | |
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143 | * char key = alloc( key_sb.size ); |
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144 | strcpy( key, key_sb.string ); |
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145 | |
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146 | // Doesn't handle comments |
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147 | while () { |
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148 | in | c; |
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149 | if ( c == ' ' || c == '\n' ) break; |
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150 | add_char( value_sb, c ); |
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151 | } |
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152 | |
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153 | * char value = alloc( value_sb.size ); |
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154 | strcpy( value, value_sb.string ); |
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155 | |
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156 | add_kv_pair( kv_pairs, key, value ); |
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157 | |
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158 | if ( fail( in ) ) break; |
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159 | in | nl; // ignore remainder of line |
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160 | } // for |
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161 | } catch( Open_Failure * ex; ex->istream == &in ) { |
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162 | ^kv_pairs{}; |
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163 | exit | "Error: could not open input file \"" | config_file | "\""; |
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164 | } // try |
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165 | close( in ); |
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166 | |
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167 | return kv_pairs; |
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168 | } |
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169 | |
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170 | // Parse configuration values from intermediate format |
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171 | void parse_config( const char * config_file, config_entry entries[], size_t num_entries ) { |
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172 | KVPairs kv_pairs = parse_tabular_config_format( config_file, num_entries ); |
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173 | |
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174 | int entries_so_far = 0; |
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175 | for ( i; kv_pairs.size ) { |
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176 | if ( entries_so_far == num_entries ) break; |
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177 | |
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178 | char * src_key, * src_value; |
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179 | [ src_key, src_value ] = kv_pairs.data[i]; |
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180 | |
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181 | for ( j; num_entries ) { |
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182 | if ( strcmp( src_key, entries[j].key ) != 0 ) continue; |
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183 | if ( entries[j].parse( src_value, entries[j].variable ) ) { |
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184 | ++entries_so_far; |
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185 | |
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186 | // Validate the parsed data, if necessary |
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187 | if ( entries[j].validate != (bool (*)(void *))0p ) { |
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188 | if ( !entries[j].validate( entries[j].variable ) ) throwValidation_Failure( entries[j] ); |
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189 | } |
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190 | |
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191 | break; |
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192 | } |
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193 | |
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194 | serr | "Value '" | src_value | "' for key '" | src_key | "' could not be parsed"; |
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195 | } |
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196 | } |
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197 | } // processConfigFile |
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198 | |
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199 | |
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200 | // *********************************** validation *********************************** |
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201 | |
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202 | |
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203 | forall(T | Relational( T )) |
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204 | bool is_nonnegative( T & value ) { |
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205 | T zero_val = 0; |
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206 | return value >= zero_val; |
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207 | } |
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208 | |
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209 | forall(T | Relational( T )) |
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210 | bool is_positive( T & value ) { |
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211 | T zero_val = 0; |
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212 | return value > zero_val; |
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213 | } |
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214 | |
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215 | forall(T | Relational( T )) |
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216 | bool is_nonpositive( T & value ) { |
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217 | T zero_val = 0; |
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218 | return value <= zero_val; |
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219 | } |
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220 | |
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221 | forall(T | Relational( T )) |
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222 | bool is_negative( T & value ) { |
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223 | T zero_val = 0; |
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224 | return value < zero_val; |
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225 | } |
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226 | |
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227 | |
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228 | // Local Variables: // |
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229 | // tab-width: 4 // |
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230 | // compile-command: "cfa parseconfig.cfa" // |
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231 | // End: // |
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