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1 | /* |
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2 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. |
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3 | * |
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4 | * Copyright 2015 Olaf Wintermann. All rights reserved. |
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5 | * |
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6 | * Redistribution and use in source and binary forms, with or without |
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7 | * modification, are permitted provided that the following conditions are met: |
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8 | * |
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9 | * 1. Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * |
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12 | * 2. Redistributions in binary form must reproduce the above copyright |
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13 | * notice, this list of conditions and the following disclaimer in the |
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14 | * documentation and/or other materials provided with the distribution. |
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15 | * |
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16 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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17 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
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20 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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21 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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22 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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23 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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24 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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25 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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26 | * POSSIBILITY OF SUCH DAMAGE. |
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27 | */ |
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28 | |
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29 | #include "davqlparser.h" |
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30 | #include <string.h> |
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31 | #include <stdio.h> |
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32 | #include <ctype.h> |
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33 | |
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34 | #define sfmtarg(s) ((int)(s).length), (s).ptr |
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35 | |
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36 | // ------------------------------------------------------------------------ |
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37 | // D E B U G E R |
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38 | // ------------------------------------------------------------------------ |
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39 | |
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40 | static const char* _map_querytype(davqltype_t type) { |
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41 | switch(type) { |
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42 | case DAVQL_ERROR: return "ERROR"; |
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43 | case DAVQL_GET: return "GET"; |
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44 | case DAVQL_SET: return "SET"; |
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45 | default: return "unknown"; |
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46 | } |
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47 | } |
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48 | |
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49 | static const char* _map_exprtype(davqlexprtype_t type) { |
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50 | switch(type) { |
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51 | case DAVQL_LITERAL: return "LITERAL"; |
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52 | case DAVQL_IDENTIFIER: return "IDENTIFIER"; |
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53 | case DAVQL_UNARY: return "UNARY"; |
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54 | case DAVQL_BINARY: return "BINARY"; |
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55 | case DAVQL_LOGICAL: return "LOGICAL"; |
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56 | case DAVQL_FUNCCALL: return "FUNCCALL"; |
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57 | default: return "unknown"; |
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58 | } |
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59 | } |
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60 | |
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61 | static const char* _map_operator(davqloperator_t op) { |
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62 | // don't use string array, because enum values may change |
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63 | switch(op) { |
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64 | case ADD: return "+"; case SUB: return "-"; case MUL: return "*"; |
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65 | case DIV: return "/"; case AND: return "&"; case OR: return "|"; |
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66 | case XOR: return "^"; case NEG: return "~"; case NOT: return "NOT"; |
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67 | case LAND: return "AND"; case LOR: return "OR"; case LXOR: return "XOR"; |
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68 | case EQ: return "="; case NEQ: return "!="; case LT: return "<"; |
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69 | case GT: return ">"; case LE: return "<="; case GE: return ">="; |
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70 | case LIKE: return "LIKE"; case UNLIKE: return "UNLIKE"; |
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71 | default: return "unknown"; |
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72 | } |
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73 | } |
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74 | |
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75 | static void dav_debug_ql_stmt_print(DavQLStatement *stmt) { |
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76 | sstr_t empty = ST("(empty)"); |
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77 | |
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78 | // Basic information |
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79 | printf("Statement: %.*s\nType: %s\nField count: %zu", |
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80 | sfmtarg(stmt->srctext), |
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81 | _map_querytype(stmt->type), |
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82 | ucx_list_size(stmt->fields)); |
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83 | |
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84 | // Has wildcard |
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85 | _Bool wildcard = 0; |
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86 | UCX_FOREACH(elm, stmt->fields) { |
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87 | DavQLExpression* expr = (DavQLExpression*)elm->data; |
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88 | if (expr->type == DAVQL_IDENTIFIER && |
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89 | expr->srctext.length == 1 && *(expr->srctext.ptr) == '*') { |
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90 | wildcard = 1; |
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91 | } |
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92 | } |
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93 | printf(" %s wildcard\nPath: %.*s\nHas where clause: %s\n", |
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94 | wildcard?"with":"without", |
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95 | sfmtarg(stmt->path ? stmt->path->srctext : empty), |
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96 | stmt->where ? "yes" : "no"); |
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97 | if (stmt->type == DAVQL_SET) { |
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98 | printf("Value list size matches: %s", |
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99 | ucx_list_size(stmt->fields) == ucx_list_size(stmt->setvalues) |
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100 | ? "yes" : "no"); |
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101 | } |
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102 | |
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103 | // WITH attributes |
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104 | if (stmt->depth == SIZE_MAX) { |
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105 | printf("Depth: unbound\n"); |
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106 | } else { |
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107 | printf("Depth: %zu\n", stmt->depth); |
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108 | } |
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109 | } |
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110 | |
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111 | static int dav_debug_ql_expr_selected(DavQLExpression *expr) { |
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112 | if (!expr) { |
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113 | printf("Currently no expression selected.\n"); |
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114 | return 0; |
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115 | } else { |
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116 | return 1; |
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117 | } |
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118 | } |
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119 | |
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120 | static void dav_debug_ql_expr_print(DavQLExpression *expr) { |
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121 | if (dav_debug_ql_expr_selected(expr)) { |
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122 | sstr_t empty = ST("(empty)"); |
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123 | printf( |
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124 | "Text: %.*s\nType: %s\nOperator: %s\n" |
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125 | "Left hand: %.*s\nRight hand: %.*s\n", |
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126 | sfmtarg(expr->srctext), |
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127 | _map_exprtype(expr->type), |
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128 | _map_operator(expr->op), |
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129 | sfmtarg(expr->left?expr->left->srctext:empty), |
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130 | sfmtarg(expr->right?expr->right->srctext:empty)); |
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131 | } |
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132 | } |
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133 | |
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134 | #define DQLD_CMD_Q 0 |
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135 | #define DQLD_CMD_PS 1 |
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136 | #define DQLD_CMD_PE 2 |
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137 | #define DQLD_CMD_P 10 |
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138 | #define DQLD_CMD_L 21 |
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139 | #define DQLD_CMD_R 22 |
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140 | #define DQLD_CMD_H 100 |
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141 | |
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142 | static int dav_debug_ql_command() { |
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143 | printf("> "); |
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144 | |
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145 | char buffer[16]; |
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146 | fgets(buffer, 16, stdin); |
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147 | if (!strcmp(buffer, "q\n")) { |
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148 | return DQLD_CMD_Q; |
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149 | } else if (!strcmp(buffer, "ps\n")) { |
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150 | return DQLD_CMD_PS; |
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151 | } else if (!strcmp(buffer, "pe\n")) { |
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152 | return DQLD_CMD_PE; |
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153 | } else if (!strcmp(buffer, "p\n")) { |
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154 | return DQLD_CMD_P; |
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155 | } else if (!strcmp(buffer, "l\n")) { |
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156 | return DQLD_CMD_L; |
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157 | } else if (!strcmp(buffer, "r\n")) { |
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158 | return DQLD_CMD_R; |
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159 | } else if (!strcmp(buffer, "h\n")) { |
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160 | return DQLD_CMD_H; |
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161 | } else { |
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162 | return -1; |
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163 | } |
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164 | } |
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165 | |
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166 | void dav_debug_statement(DavQLStatement *stmt) { |
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167 | if (!stmt) { |
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168 | fprintf(stderr, "Debug DavQLStatement failed: null pointer"); |
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169 | return; |
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170 | } |
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171 | |
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172 | printf("Starting DavQL debugger (type 'h' for help)...\n\n"); |
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173 | dav_debug_ql_stmt_print(stmt); |
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174 | |
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175 | DavQLExpression *examineexpr = NULL; |
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176 | |
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177 | while(1) { |
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178 | int cmd = dav_debug_ql_command(); |
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179 | switch (cmd) { |
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180 | case DQLD_CMD_Q: return; |
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181 | case DQLD_CMD_PS: dav_debug_ql_stmt_print(stmt); break; |
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182 | case DQLD_CMD_PE: dav_debug_ql_expr_print(examineexpr); break; |
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183 | case DQLD_CMD_P: |
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184 | examineexpr = stmt->path; |
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185 | dav_debug_ql_expr_print(examineexpr); |
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186 | break; |
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187 | case DQLD_CMD_L: |
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188 | if (dav_debug_ql_expr_selected(examineexpr)) { |
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189 | if (examineexpr->left) { |
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190 | examineexpr = examineexpr->left; |
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191 | dav_debug_ql_expr_print(examineexpr); |
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192 | } else { |
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193 | printf("There is no left subtree.\n"); |
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194 | } |
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195 | } |
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196 | break; |
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197 | case DQLD_CMD_R: |
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198 | if (dav_debug_ql_expr_selected(examineexpr)) { |
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199 | if (examineexpr->right) { |
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200 | examineexpr = examineexpr->right; |
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201 | dav_debug_ql_expr_print(examineexpr); |
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202 | } else { |
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203 | printf("There is no right subtree.\n"); |
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204 | } |
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205 | } |
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206 | break; |
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207 | case DQLD_CMD_H: |
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208 | printf( |
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209 | "\nCommands:\n" |
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210 | "p: examine path\n" |
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211 | "ps: print statement information\n" |
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212 | "q: quit\n\n" |
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213 | "\nExpression examination:\n" |
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214 | "pe: print expression information\n" |
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215 | "l: enter left subtree\n" |
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216 | "r: enter right subtree\n"); |
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217 | break; |
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218 | default: printf("unknown command\n"); |
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219 | } |
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220 | } |
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221 | } |
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222 | |
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223 | // ------------------------------------------------------------------------ |
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224 | // P A R S E R |
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225 | // ------------------------------------------------------------------------ |
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226 | |
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227 | static UcxList* dav_parse_tokenize(sstr_t src) { |
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228 | UcxList *tokens = NULL; |
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229 | |
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230 | // Delimiters: whitespace and dead whitespace around commas |
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231 | sstr_t *token = NULL; |
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232 | for (size_t i = 0 ; i < src.length ; i++) { |
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233 | if (isspace(src.ptr[i])) { |
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234 | // add token before spaces to list (if any) |
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235 | if (token) { |
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236 | tokens = ucx_list_append(tokens, token); |
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237 | token = NULL; |
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238 | } |
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239 | } else if (src.ptr[i] == ',') { |
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240 | // add token before comma to list (if any) |
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241 | if (token) { |
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242 | tokens = ucx_list_append(tokens, token); |
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243 | token = NULL; |
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244 | } |
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245 | // add comma as token to list |
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246 | token = malloc(sizeof(sstr_t)); |
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247 | token->ptr = src.ptr + i; |
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248 | token->length = 1; |
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249 | tokens = ucx_list_append(tokens, token); |
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250 | // set tokenizer ready to read more tokens |
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251 | token = NULL; |
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252 | } else { |
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253 | // if this is a new token, create memory for it |
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254 | if (!token) { |
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255 | token = malloc(sizeof(sstr_t)); |
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256 | token->ptr = src.ptr + i; |
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257 | token->length = 0; |
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258 | } |
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259 | // extend token length when reading more bytes |
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260 | token->length++; |
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261 | } |
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262 | } |
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263 | |
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264 | if (token) { |
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265 | tokens = ucx_list_append(tokens, token); |
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266 | } |
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267 | |
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268 | return tokens; |
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269 | } |
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270 | |
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271 | static DavQLExpression* dav_parse_expression(sstr_t src) { |
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272 | DavQLExpression *expr = calloc(1, sizeof(DavQLExpression)); |
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273 | expr->srctext = src; |
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274 | |
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275 | return expr; |
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276 | } |
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277 | |
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278 | static void dav_parse_get_statement(DavQLStatement *stmt, UcxList *tokens) { |
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279 | stmt->type = DAVQL_GET; |
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280 | |
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281 | /* |
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282 | * 10: field list |
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283 | * 20: FROM clause |
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284 | * 520: expecting WHERE or WITH clause |
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285 | * 30: WHERE clause |
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286 | * 530: expecting WITH clause |
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287 | * 40: WITH clause |
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288 | * 500: ready to quit |
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289 | * |
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290 | */ |
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291 | int step = 10; |
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292 | |
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293 | UCX_FOREACH(token, tokens) { |
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294 | sstr_t tokendata = *(sstr_t*)token->data; |
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295 | |
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296 | switch (step) { |
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297 | // optional clauses |
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298 | case 520: |
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299 | if (!sstrcasecmp(tokendata, S("where"))) { |
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300 | step = 30; |
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301 | } |
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302 | /* no break */ |
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303 | case 530: |
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304 | if (!sstrcasecmp(tokendata, S("with"))) { |
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305 | step = 40; |
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306 | } |
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307 | break; |
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308 | // field list |
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309 | case 10: |
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310 | if (!sstrcasecmp(tokendata, S("from"))) { |
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311 | step = 20; |
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312 | } else { |
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313 | stmt->fields = ucx_list_append(stmt->fields, |
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314 | dav_parse_expression(tokendata)); |
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315 | } |
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316 | break; |
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317 | // from clause |
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318 | case 20: |
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319 | stmt->path = dav_parse_expression(tokendata); |
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320 | step = 520; |
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321 | break; |
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322 | // where clause |
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323 | case 30: |
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324 | step = 530; |
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325 | break; |
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326 | // with clause |
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327 | case 40: |
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328 | step = 500; |
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329 | break; |
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330 | } |
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331 | |
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332 | free(token->data); |
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333 | } |
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334 | |
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335 | if (step < 500) { |
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336 | stmt->type = DAVQL_ERROR; |
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337 | // TODO: save parse error message |
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338 | } |
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339 | } |
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340 | |
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341 | static void dav_parse_set_statement(DavQLStatement *stmt, UcxList *tokens) { |
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342 | stmt->type = DAVQL_SET; |
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343 | |
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344 | UCX_FOREACH(token, tokens) { |
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345 | sstr_t tokendata = *(sstr_t*)token->data; |
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346 | |
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347 | // just free the tokens, until the function is implemented |
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348 | |
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349 | free(token->data); |
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350 | } |
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351 | } |
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352 | |
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353 | DavQLStatement* dav_parse_statement(sstr_t srctext) { |
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354 | DavQLStatement *stmt = calloc(1, sizeof(DavQLStatement)); |
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355 | |
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356 | // default values |
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357 | stmt->type = -1; |
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358 | stmt->depth = SIZE_MAX; |
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359 | |
82
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360 | // save trimmed source text |
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361 | stmt->srctext = sstrtrim(srctext); |
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362 | |
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363 | // tokenization |
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364 | UcxList* tokens = dav_parse_tokenize(stmt->srctext); |
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365 | |
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366 | // use first token to determine query type |
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367 | if (tokens) { |
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368 | sstr_t token = *(sstr_t*)tokens->data; |
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369 | free(tokens->data); |
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370 | tokens = ucx_list_remove(tokens, tokens); |
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371 | if (!sstrcasecmp(token, S("get"))) { |
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372 | dav_parse_get_statement(stmt, tokens); |
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373 | } else if (!sstrcasecmp(token, S("set"))) { |
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374 | dav_parse_set_statement(stmt, tokens); |
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375 | } else { |
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376 | stmt->type = DAVQL_ERROR; |
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377 | } |
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378 | ucx_list_free(tokens); |
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379 | } else { |
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380 | stmt->type = DAVQL_ERROR; |
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381 | } |
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382 | |
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383 | return stmt; |
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384 | } |
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385 | |
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386 | static void dav_free_expression(DavQLExpression *expr) { |
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387 | if (expr->left) { |
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388 | dav_free_expression(expr->left); |
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389 | } |
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390 | if (expr->right) { |
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391 | dav_free_expression(expr->right); |
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392 | } |
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393 | free(expr); |
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394 | } |
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395 | |
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396 | void dav_free_statement(DavQLStatement *stmt) { |
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397 | UCX_FOREACH(expr, stmt->fields) { |
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398 | dav_free_expression(expr->data); |
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399 | } |
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400 | ucx_list_free(stmt->fields); |
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401 | UCX_FOREACH(expr, stmt->setvalues) { |
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402 | dav_free_expression(expr->data); |
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403 | } |
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404 | ucx_list_free(stmt->setvalues); |
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405 | |
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406 | if (stmt->path) { |
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407 | dav_free_expression(stmt->path); |
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408 | } |
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409 | if (stmt->where) { |
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410 | dav_free_expression(stmt->where); |
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411 | } |
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412 | free(stmt); |
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413 | } |