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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 | #ifndef DAVQLPARSER_H |
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30 | #define DAVQLPARSER_H |
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31 | |
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32 | #ifdef __cplusplus |
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33 | extern "C" { |
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34 | #endif |
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35 | |
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36 | #include "ucx/string.h" |
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37 | #include "ucx/list.h" |
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38 | |
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39 | /** |
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40 | * Enumeration of possible statement types. |
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41 | */ |
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42 | typedef enum {GET, PUT} davqltype_t; |
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43 | |
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44 | /** |
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45 | * Enumeration of possible expression types. |
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46 | */ |
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47 | typedef enum { |
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48 | LITERAL, IDENTIFIER, |
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49 | UNARY, BINARY, LOGICAL, FUNCCALL |
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50 | } davqlexprtype_t; |
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51 | |
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52 | /** |
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53 | * Enumeration of possible expression operators. |
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54 | */ |
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55 | typedef enum { |
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56 | ADD, SUB, MUL, DIV, |
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57 | AND, OR, XOR, NEG, |
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58 | NOT, LAND, LOR, |
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59 | EQ, NEQ, LT, GT, LE, GE |
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60 | } davqloperator_t; |
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61 | |
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62 | /** |
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63 | * An expression within a DAVQL query. |
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64 | */ |
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65 | typedef struct _davqlexpr DavQLExpression; |
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66 | |
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67 | /** |
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68 | * The structure for type DavQLExpression. |
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69 | */ |
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70 | struct _davqlexpr { |
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71 | /** |
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72 | * The original expression text. |
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73 | * Contains the literal value, if type is LITERAL. |
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74 | */ |
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75 | sstr_t srctext; |
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76 | /** |
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77 | * The expression type. |
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78 | */ |
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79 | davqlexprtype_t type; |
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80 | /** |
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81 | * Operator. |
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82 | * |
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83 | */ |
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84 | davqloperator_t op; |
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85 | /** |
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86 | * Left or single operand. |
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87 | * <code>NULL</code> for literals or identifiers. |
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88 | */ |
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89 | DavQLExpression *expr1; |
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90 | /** |
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91 | * Right operand. |
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92 | * <code>NULL</code> for literals, identifiers or unary expressions. |
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93 | */ |
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94 | DavQLExpression *expr2; |
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95 | }; |
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96 | |
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97 | |
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98 | /** |
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99 | * Query statement object. |
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100 | * Contains the binary information about the parsed query. |
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101 | * |
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102 | * The grammar for a DavQLStatement is: |
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103 | * |
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104 | * <b>GET:</b> |
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105 | * document it so |
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106 | * |
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107 | * <b>PUT:</b> |
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108 | * make it so |
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109 | * |
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110 | */ |
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111 | typedef struct { |
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112 | /** |
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113 | * The original query text. |
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114 | */ |
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115 | sstr_t srctext; |
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116 | /** |
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117 | * The statement type. |
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118 | */ |
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119 | davqltype_t type; |
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120 | /** |
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121 | * The list of field expressions. |
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122 | * <ul> |
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123 | * <li> |
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124 | * GET: the list of queried fields (may contain arbitrary expressions) |
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125 | * </li> |
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126 | * <li> |
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127 | * PUT: the list of DAV properties that shall receive new values |
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128 | * (must be a list of IDENTIFIER expressions) |
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129 | * </li> |
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130 | * </ul> |
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131 | * This may be <code>NULL</code> for GET queries, to request all properties. |
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132 | */ |
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133 | UcxList* fields; |
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134 | /** |
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135 | * The list of DavQLExpressions for the new DAV property values. |
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136 | * This is <code>NULL</code> for GET queries. |
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137 | */ |
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138 | UcxList* putvalues; |
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139 | /** |
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140 | * A DavQLExpression that denotes the queried path. |
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141 | */ |
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142 | DavQLExpression from; |
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143 | /** |
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144 | * Logical expression for selection. |
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145 | * <code>NULL</code>, if there is no where clause. |
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146 | */ |
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147 | DavQLExpression* where; |
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148 | /** |
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149 | * The recursion depth for the statement. |
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150 | * Defaults to SIZE_MAX (unbound recursion). |
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151 | */ |
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152 | size_t depth; |
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153 | } DavQLStatement; |
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154 | |
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155 | |
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156 | #ifdef __cplusplus |
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157 | } |
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158 | #endif |
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159 | |
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160 | #endif /* DAVQLPARSER_H */ |
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161 |