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 | // TODO: Add names of missing config entries to exception (see further below) |
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12 | static vtable(Missing_Config_Entries) Missing_Config_Entries_vt; |
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13 | |
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14 | [ void ] ?{}( & Missing_Config_Entries this, unsigned int num_missing ) { |
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15 | this.virtual_table = &Missing_Config_Entries_vt; |
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16 | this.num_missing = num_missing; |
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17 | } |
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18 | |
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19 | // TODO: use string interface when it's ready (and implement exception msg protocol) |
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20 | [ void ] msg( * Missing_Config_Entries ex ) { |
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21 | serr | nlOff; |
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22 | serr | "The config file is missing " | ex->num_missing; |
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23 | serr | nlOn; |
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24 | if ( ex->num_missing == 1 ) { |
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25 | serr | " entry."; |
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26 | } else { |
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27 | serr | " entries."; |
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28 | } |
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29 | } // msg |
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30 | |
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31 | |
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32 | static vtable(Parse_Failure) Parse_Failure_vt; |
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33 | |
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34 | [ void ] ?{}( & Parse_Failure this, [] char failed_key, [] char failed_value ) { |
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35 | this.virtual_table = &Parse_Failure_vt; |
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36 | |
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37 | this.failed_key = alloc( strlen( failed_key ) ); |
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38 | this.failed_value = alloc( strlen( failed_value ) ); |
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39 | strcpy( this.failed_key, failed_key ); |
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40 | strcpy( this.failed_value, failed_value ); |
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41 | } |
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42 | |
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43 | [ void ] ^?{}( & Parse_Failure this ) with ( this ) { |
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44 | free( failed_key ); |
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45 | free( failed_value ); |
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46 | } |
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47 | |
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48 | // TODO: use string interface when it's ready (and implement exception msg protocol) |
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49 | [ void ] msg( * Parse_Failure ex ) { |
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50 | serr | "Config entry " | ex->failed_key | " could not be parsed. It has value " | ex->failed_value | "."; |
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51 | } |
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52 | |
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53 | |
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54 | static vtable(Validation_Failure) Validation_Failure_vt; |
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55 | |
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56 | [ void ] ?{}( & Validation_Failure this, [] char failed_key, [] char failed_value ) { |
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57 | this.virtual_table = &Validation_Failure_vt; |
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58 | |
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59 | this.failed_key = alloc( strlen( failed_key ) ); |
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60 | this.failed_value = alloc( strlen( failed_value ) ); |
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61 | strcpy( this.failed_key, failed_key ); |
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62 | strcpy( this.failed_value, failed_value ); |
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63 | } |
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64 | |
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65 | [ void ] ^?{}( & Validation_Failure this ) with ( this ) { |
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66 | free( failed_key ); |
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67 | free( failed_value ); |
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68 | } |
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69 | |
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70 | // TODO: use string interface when it's ready (and implement exception msg protocol) |
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71 | [ void ] msg( * Validation_Failure ex ) { |
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72 | serr | "Config entry " | ex->failed_key | " could not be validated. It has value " | ex->failed_value | "."; |
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73 | } |
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74 | |
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75 | |
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76 | // *********************************** main code *********************************** |
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77 | |
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78 | |
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79 | [ void ] ?{}( & KVPairs kvp ) with ( kvp ) { // default constructor |
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80 | size = 0; max_size = 0; data = 0p; |
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81 | } |
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82 | |
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83 | [ void ] ?{}( & KVPairs kvp, size_t size ) { // initialization |
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84 | kvp.[ size, max_size ] = [ 0, size ]; |
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85 | kvp.data = alloc( size ); |
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86 | } |
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87 | |
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88 | [ void ] ^?{}( & KVPairs kvp ) with ( kvp ) { // destructor |
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89 | for ( i; size ) free( data[i] ); |
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90 | free( data ); |
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91 | size = 0; max_size = 0; data = 0p; |
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92 | } |
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93 | |
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94 | [ void ] add_kv_pair( & KVPairs kv_pairs, [] char key, [] char value ) with ( kv_pairs ) { |
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95 | if ( max_size == 0 ) { |
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96 | max_size = 1; |
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97 | data = alloc( max_size ); |
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98 | } else if ( size == max_size ) { |
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99 | max_size *= 2; |
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100 | data = alloc( max_size, data`realloc ); |
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101 | } |
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102 | |
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103 | data[size].0 = alloc( strlen( key ) ); |
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104 | data[size].1 = alloc( strlen( value ) ); |
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105 | strcpy( data[size].0, key ); |
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106 | strcpy( data[size].1, value ); |
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107 | ++size; |
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108 | } // add_kv_pair |
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109 | |
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110 | |
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111 | [ bool ] comments( & ifstream in, [] char name ) { |
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112 | while () { |
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113 | in | name; |
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114 | if ( eof( in ) ) return true; |
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115 | if ( name[0] != '#' ) return false; |
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116 | in | nl; // ignore remainder of line |
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117 | } // while |
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118 | } // comments |
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119 | |
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120 | // Parse configuration from a file formatted in tabular (CS 343) style |
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121 | [ * KVPairs ] parse_tabular_config_format( * const char config_file, size_t num_entries ) { |
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122 | // TODO: Change this to a unique_ptr when we fully support returning them (move semantics) |
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123 | * KVPairs kv_pairs = new( num_entries ); |
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124 | |
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125 | ifstream in; |
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126 | try { |
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127 | open( in, config_file ); // open the configuration file for input |
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128 | |
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129 | [64] char key; |
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130 | [256] char value; |
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131 | |
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132 | while () { // parameter names can appear in any order |
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133 | // NOTE: Must add check to see if already read in value for this key, |
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134 | // once we switch to using hash table as intermediate storage |
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135 | if ( comments( in, key ) ) break; // eof ? |
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136 | in | value; |
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137 | |
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138 | add_kv_pair( *kv_pairs, key, value ); |
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139 | |
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140 | if ( eof( in ) ) break; |
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141 | in | nl; // ignore remainder of line |
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142 | } // for |
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143 | } catch( Open_Failure * ex; ex->istream == &in ) { |
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144 | delete( kv_pairs ); |
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145 | throw *ex; |
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146 | } // try |
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147 | close( in ); |
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148 | |
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149 | return kv_pairs; |
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150 | } // parse_tabular_config_format |
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151 | |
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152 | // Parse configuration values from intermediate format |
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153 | [ void ] parse_config( |
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154 | [] const char config_file, |
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155 | [] config_entry entries, |
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156 | size_t num_entries, |
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157 | KVPairs * (*parser)(const char [], size_t) |
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158 | ) { |
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159 | * KVPairs kv_pairs = parser( config_file, num_entries ); |
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160 | |
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161 | int entries_so_far = 0; |
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162 | for ( i; kv_pairs->size ) { |
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163 | if ( entries_so_far == num_entries ) break; |
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164 | |
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165 | char * src_key, * src_value; |
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166 | [ src_key, src_value ] = kv_pairs->data[i]; |
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167 | |
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168 | for ( j; num_entries ) { |
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169 | if ( strcmp( src_key, entries[j].key ) != 0 ) continue; |
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170 | // Parse the data |
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171 | if ( !entries[j].parse( src_value, entries[j].variable ) ) { |
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172 | * Parse_Failure ex = new( src_key, src_value ); |
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173 | delete( kv_pairs ); |
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174 | throw *ex; |
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175 | } |
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176 | |
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177 | // Validate the data |
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178 | if ( !entries[j].validate( entries[j].variable ) ) { |
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179 | * Validation_Failure ex = new( src_key, src_value ); |
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180 | delete( kv_pairs ); |
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181 | throw *ex; |
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182 | } |
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183 | |
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184 | ++entries_so_far; |
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185 | |
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186 | break; |
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187 | } |
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188 | } |
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189 | // TODO: Once we get vector2+hash_table, we can more easily add the missing config keys to this error |
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190 | if ( entries_so_far < num_entries ) { |
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191 | delete( kv_pairs ); |
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192 | throw (Missing_Config_Entries){ num_entries - entries_so_far }; |
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193 | } |
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194 | |
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195 | delete( kv_pairs ); |
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196 | } // parse_config |
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197 | |
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198 | |
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199 | // *********************************** validation *********************************** |
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200 | |
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201 | |
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202 | forall(T | Relational( T )) |
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203 | [ bool ] is_nonnegative( & T value ) { |
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204 | T zero_val = 0; |
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205 | return value >= zero_val; |
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206 | } |
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207 | |
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208 | forall(T | Relational( T )) |
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209 | [ bool ] is_positive( & T value ) { |
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210 | T zero_val = 0; |
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211 | return value > zero_val; |
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212 | } |
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213 | |
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214 | forall(T | Relational( T )) |
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215 | [ bool ] is_nonpositive( & T value ) { |
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216 | T zero_val = 0; |
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217 | return value <= zero_val; |
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218 | } |
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219 | |
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220 | forall(T | Relational( T )) |
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221 | [ bool ] is_negative( & T value ) { |
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222 | T zero_val = 0; |
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223 | return value < zero_val; |
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224 | } |
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225 | |
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226 | |
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227 | // Local Variables: // |
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228 | // tab-width: 4 // |
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229 | // compile-command: "cfa parseconfig.cfa" // |
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230 | // End: // |
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