1 | /* Copyright 2009, UCAR/Unidata and OPeNDAP, Inc. |
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2 | See the COPYRIGHT file for more information. */ |
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3 | |
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4 | /* Parser actions for constraint expressions */ |
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5 | |
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6 | /* Since oc does not use the constraint parser, |
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7 | they functions all just abort if called. |
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8 | */ |
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9 | |
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10 | #include "config.h" |
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11 | #include <stdlib.h> |
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12 | #include <stdio.h> |
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13 | #include <string.h> |
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14 | #include <assert.h> |
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15 | |
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16 | #include "netcdf.h" |
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17 | |
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18 | #include "nclist.h" |
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19 | #include "ncbytes.h" |
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20 | #include "dceconstraints.h" |
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21 | #include "dceparselex.h" |
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22 | |
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23 | static Object collectlist(Object list0, Object decl); |
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24 | |
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25 | void |
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26 | projections(DCEparsestate* state, Object list0) |
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27 | { |
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28 | NClist* list = (NClist*)list0; |
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29 | if(list != NULL) { |
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30 | nclistfree(state->constraint->projections); |
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31 | state->constraint->projections = list; |
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32 | } |
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33 | #ifdef DEBUG |
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34 | fprintf(stderr," ce.projections: %s\n", |
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35 | dcetostring((DCEnode*)state->constraint->projections)); |
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36 | #endif |
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37 | } |
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38 | |
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39 | void |
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40 | selections(DCEparsestate* state, Object list0) |
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41 | { |
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42 | NClist* list = (NClist*)list0; |
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43 | if(list != NULL) { |
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44 | nclistfree(state->constraint->selections); |
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45 | state->constraint->selections = list; |
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46 | } |
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47 | #ifdef DEBUG |
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48 | fprintf(stderr," ce.selections: %s\n", |
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49 | dcetostring((DCEnode*)state->constraint->selections)); |
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50 | #endif |
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51 | } |
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52 | |
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53 | |
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54 | Object |
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55 | projectionlist(DCEparsestate* state, Object list0, Object decl) |
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56 | { |
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57 | return collectlist(list0,decl); |
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58 | } |
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59 | |
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60 | Object |
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61 | projection(DCEparsestate* state, Object varorfcn) |
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62 | { |
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63 | DCEprojection* p = (DCEprojection*)dcecreate(CES_PROJECT); |
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64 | CEsort tag = *(CEsort*)varorfcn; |
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65 | if(tag == CES_FCN) |
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66 | p->fcn = varorfcn; |
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67 | else |
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68 | p->var = varorfcn; |
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69 | p->discrim = tag; |
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70 | #ifdef DEBUG |
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71 | fprintf(stderr," ce.projection: %s\n", |
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72 | dcetostring((DCEnode*)p)); |
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73 | #endif |
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74 | return p; |
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75 | } |
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76 | |
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77 | Object |
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78 | segmentlist(DCEparsestate* state, Object var0, Object decl) |
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79 | { |
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80 | /* watch out: this is non-standard */ |
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81 | NClist* list; |
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82 | DCEvar* v = (DCEvar*)var0; |
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83 | if(v==NULL) v = (DCEvar*)dcecreate(CES_VAR); |
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84 | list = v->segments; |
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85 | if(list == NULL) list = nclistnew(); |
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86 | nclistpush(list,(ncelem)decl); |
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87 | v->segments = list; |
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88 | return v; |
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89 | } |
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90 | |
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91 | Object |
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92 | segment(DCEparsestate* state, Object name, Object slices0) |
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93 | { |
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94 | int i; |
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95 | DCEsegment* segment = (DCEsegment*)dcecreate(CES_SEGMENT); |
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96 | NClist* slices = (NClist*)slices0; |
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97 | segment->name = strdup((char*)name); |
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98 | if(slices != NULL && nclistlength(slices) > 0) { |
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99 | segment->rank = nclistlength(slices); |
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100 | segment->slicesdefined = 1; /* but not declsizes */ |
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101 | for(i=0;i<nclistlength(slices);i++) { |
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102 | DCEslice* slice = (DCEslice*)nclistget(slices,i); |
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103 | segment->slices[i] = *slice; |
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104 | free(slice); |
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105 | } |
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106 | nclistfree(slices); |
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107 | } else |
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108 | segment->slicesdefined = 0; |
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109 | #ifdef DEBUG |
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110 | fprintf(stderr," ce.segment: %s\n", |
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111 | dumpsegment(segment)); |
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112 | #endif |
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113 | return segment; |
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114 | } |
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115 | |
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116 | |
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117 | Object |
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118 | rangelist(DCEparsestate* state, Object list0, Object decl) |
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119 | { |
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120 | return collectlist(list0,decl); |
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121 | } |
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122 | |
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123 | Object |
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124 | range(DCEparsestate* state, Object sfirst, Object sstride, Object slast) |
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125 | { |
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126 | DCEslice* slice = (DCEslice*)dcecreate(CES_SLICE); |
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127 | unsigned long first,stride,last; |
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128 | |
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129 | /* Note: that incoming arguments are strings; we must convert to size_t; |
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130 | but we do know they are legal integers or NULL */ |
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131 | sscanf((char*)sfirst,"%lu",&first); /* always defined */ |
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132 | if(slast != NULL) |
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133 | sscanf((char*)slast,"%lu",&last); |
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134 | else |
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135 | last = first; |
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136 | if(sstride != NULL) |
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137 | sscanf((char*)sstride,"%lu",&stride); |
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138 | else |
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139 | stride = 1; /* default */ |
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140 | |
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141 | if(stride == 0) |
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142 | dceerror(state,"Illegal index for range stride"); |
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143 | if(last < first) |
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144 | dceerror(state,"Illegal index for range last index"); |
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145 | slice->first = first; |
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146 | slice->stride = stride; |
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147 | slice->stop = last + 1; |
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148 | slice->length = slice->stop - slice->first; |
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149 | slice->count = slice->length / slice->stride; |
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150 | #ifdef DEBUG |
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151 | fprintf(stderr," ce.slice: %s\n", |
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152 | dumpslice(slice)); |
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153 | #endif |
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154 | return slice; |
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155 | } |
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156 | |
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157 | Object |
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158 | range1(DCEparsestate* state, Object rangenumber) |
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159 | { |
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160 | int range = -1; |
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161 | sscanf((char*)rangenumber,"%u",&range); |
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162 | if(range < 0) { |
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163 | dceerror(state,"Illegal range index"); |
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164 | } |
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165 | return rangenumber; |
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166 | } |
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167 | |
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168 | Object |
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169 | clauselist(DCEparsestate* state, Object list0, Object decl) |
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170 | { |
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171 | return collectlist(list0,decl); |
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172 | } |
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173 | |
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174 | Object |
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175 | sel_clause(DCEparsestate* state, int selcase, |
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176 | Object lhs, Object relop0, Object values) |
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177 | { |
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178 | DCEselection* sel = (DCEselection*)dcecreate(CES_SELECT); |
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179 | sel->operator = (CEsort)relop0; |
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180 | sel->lhs = (DCEvalue*)lhs; |
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181 | if(selcase == 2) {/*singleton value*/ |
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182 | sel->rhs = nclistnew(); |
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183 | nclistpush(sel->rhs,(ncelem)values); |
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184 | } else |
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185 | sel->rhs = (NClist*)values; |
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186 | return sel; |
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187 | } |
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188 | |
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189 | Object |
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190 | indexpath(DCEparsestate* state, Object list0, Object index) |
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191 | { |
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192 | return collectlist(list0,index); |
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193 | } |
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194 | |
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195 | Object |
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196 | array_indices(DCEparsestate* state, Object list0, Object indexno) |
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197 | { |
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198 | DCEslice* slice; |
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199 | long long start = -1; |
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200 | NClist* list = (NClist*)list0; |
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201 | if(list == NULL) list = nclistnew(); |
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202 | sscanf((char*)indexno,"%lld",&start); |
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203 | if(start < 0) { |
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204 | dceerror(state,"Illegal array index"); |
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205 | start = 1; |
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206 | } |
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207 | slice = (DCEslice*)dcecreate(CES_SLICE); |
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208 | slice->first = start; |
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209 | slice->stride = 1; |
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210 | slice->count = 1; |
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211 | slice->length = 1; |
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212 | slice->stop = start+1; |
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213 | nclistpush(list,(ncelem)slice); |
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214 | return list; |
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215 | } |
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216 | |
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217 | Object |
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218 | indexer(DCEparsestate* state, Object name, Object indices) |
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219 | { |
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220 | int i; |
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221 | NClist* list = (NClist*)indices; |
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222 | DCEsegment* seg = (DCEsegment*)dcecreate(CES_SEGMENT); |
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223 | seg->name = strdup((char*)name); |
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224 | for(i=0;i<nclistlength(list);i++) { |
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225 | DCEslice* slice = (DCEslice*)nclistget(list,i); |
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226 | seg->slices[i] = *slice; |
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227 | free(slice); |
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228 | } |
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229 | nclistfree(indices); |
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230 | return seg; |
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231 | } |
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232 | |
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233 | Object |
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234 | function(DCEparsestate* state, Object fcnname, Object args) |
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235 | { |
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236 | DCEfcn* fcn = (DCEfcn*)dcecreate(CES_FCN); |
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237 | fcn->name = nulldup((char*)fcnname); |
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238 | fcn->args = args; |
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239 | return fcn; |
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240 | } |
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241 | |
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242 | Object |
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243 | arg_list(DCEparsestate* state, Object list0, Object decl) |
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244 | { |
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245 | return collectlist(list0,decl); |
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246 | } |
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247 | |
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248 | |
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249 | Object |
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250 | value_list(DCEparsestate* state, Object list0, Object decl) |
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251 | { |
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252 | return collectlist(list0,decl); |
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253 | } |
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254 | |
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255 | Object |
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256 | value(DCEparsestate* state, Object val) |
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257 | { |
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258 | DCEvalue* ncvalue = (DCEvalue*)dcecreate(CES_VALUE); |
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259 | CEsort tag = *(CEsort*)val; |
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260 | switch (tag) { |
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261 | case CES_VAR: ncvalue->var = (DCEvar*)val; break; |
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262 | case CES_FCN: ncvalue->fcn = (DCEfcn*)val; break; |
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263 | case CES_CONST: ncvalue->constant = (DCEconstant*)val; break; |
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264 | default: abort(); break; |
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265 | } |
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266 | ncvalue->discrim = tag; |
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267 | return ncvalue; |
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268 | } |
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269 | |
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270 | Object |
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271 | var(DCEparsestate* state, Object indexpath) |
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272 | { |
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273 | DCEvar* v = (DCEvar*)dcecreate(CES_VAR); |
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274 | v->segments = (NClist*)indexpath; |
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275 | return v; |
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276 | } |
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277 | |
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278 | Object |
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279 | constant(DCEparsestate* state, Object val, int tag) |
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280 | { |
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281 | DCEconstant* con = (DCEconstant*)dcecreate(CES_CONST); |
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282 | char* text = (char*)val; |
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283 | char* endpoint = NULL; |
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284 | switch (tag) { |
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285 | case SCAN_STRINGCONST: |
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286 | con->discrim = CES_STR; |
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287 | con->text = nulldup(text); |
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288 | break; |
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289 | case SCAN_NUMBERCONST: |
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290 | con->intvalue = strtoll(text,&endpoint,10); |
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291 | if(*text != '\0' && *endpoint == '\0') { |
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292 | con->discrim = CES_INT; |
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293 | } else { |
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294 | con->floatvalue = strtod(text,&endpoint); |
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295 | if(*text != '\0' && *endpoint == '\0') |
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296 | con->discrim = CES_FLOAT; |
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297 | else abort(); |
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298 | } |
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299 | break; |
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300 | default: abort(); break; |
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301 | } |
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302 | return con; |
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303 | } |
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304 | |
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305 | static Object |
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306 | collectlist(Object list0, Object decl) |
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307 | { |
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308 | NClist* list = (NClist*)list0; |
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309 | if(list == NULL) list = nclistnew(); |
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310 | nclistpush(list,(ncelem)decl); |
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311 | return list; |
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312 | } |
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313 | |
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314 | Object |
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315 | makeselectiontag(CEsort tag) |
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316 | { |
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317 | return (Object) tag; |
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318 | } |
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319 | |
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320 | int |
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321 | dceerror(DCEparsestate* state, char* msg) |
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322 | { |
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323 | strcpy(state->errorbuf,msg); |
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324 | state->errorcode=1; |
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325 | return 0; |
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326 | } |
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327 | |
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328 | static void |
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329 | dce_parse_cleanup(DCEparsestate* state) |
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330 | { |
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331 | dcelexcleanup(&state->lexstate); /* will free */ |
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332 | } |
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333 | |
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334 | static DCEparsestate* |
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335 | ce_parse_init(char* input, DCEconstraint* constraint) |
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336 | { |
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337 | DCEparsestate* state = NULL; |
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338 | if(input==NULL) { |
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339 | dceerror(state,"ce_parse_init: no input buffer"); |
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340 | } else { |
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341 | state = (DCEparsestate*)calloc(1,sizeof(DCEparsestate)); |
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342 | if(state==NULL) return (DCEparsestate*)NULL; |
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343 | state->errorbuf[0] = '\0'; |
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344 | state->errorcode = 0; |
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345 | dcelexinit(input,&state->lexstate); |
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346 | state->constraint = constraint; |
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347 | } |
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348 | return state; |
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349 | } |
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350 | |
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351 | #ifdef PARSEDEBUG |
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352 | extern int dcedebug; |
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353 | #endif |
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354 | |
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355 | /* Wrapper for ceparse */ |
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356 | int |
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357 | dapceparse(char* input, DCEconstraint* constraint, char** errmsgp) |
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358 | { |
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359 | DCEparsestate* state; |
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360 | int errcode = 0; |
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361 | |
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362 | #ifdef PARSEDEBUG |
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363 | dcedebug = 1; |
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364 | #endif |
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365 | |
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366 | if(input != NULL) { |
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367 | #ifdef DEBUG |
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368 | fprintf(stderr,"dceeparse: input=%s\n",input); |
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369 | #endif |
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370 | state = ce_parse_init(input,constraint); |
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371 | if(dceparse(state) == 0) { |
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372 | #ifdef DEBUG |
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373 | if(nclistlength(constraint->projections) > 0) |
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374 | fprintf(stderr,"dceeparse: projections=%s\n", |
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375 | dcetostring((DCEnode*)constraint->projections)); |
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376 | #endif |
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377 | #ifdef DEBUG |
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378 | if(nclistlength(constraint->selections) > 0) |
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379 | fprintf(stderr,"dceeparse: selections=%s\n", |
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380 | dumpselections(constraint->selections)); |
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381 | #endif |
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382 | } else { |
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383 | if(errmsgp) *errmsgp = nulldup(state->errorbuf); |
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384 | } |
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385 | errcode = state->errorcode; |
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386 | dce_parse_cleanup(state); |
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387 | } |
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388 | return errcode; |
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389 | } |
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390 | |
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391 | #ifdef PARSEDEBUG |
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392 | Object |
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393 | debugobject(Object o) |
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394 | { |
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395 | return o; |
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396 | } |
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397 | #endif |
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