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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 <stdint.h> |
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37 | #include "ucx/string.h" |
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38 | #include "ucx/list.h" |
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39 | |
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40 | /** |
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41 | * Enumeration of possible statement types. |
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42 | */ |
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43 | typedef enum {GET, SET} davqltype_t; |
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44 | |
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45 | /** |
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46 | * Enumeration of possible expression types. |
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47 | */ |
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48 | typedef enum { |
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49 | LITERAL, IDENTIFIER, |
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50 | UNARY, BINARY, LOGICAL, FUNCCALL |
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51 | } davqlexprtype_t; |
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52 | |
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53 | /** |
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54 | * Enumeration of possible expression operators. |
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55 | */ |
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56 | typedef enum { |
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57 | ADD, SUB, MUL, DIV, |
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58 | AND, OR, XOR, NEG, |
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59 | NOT, LAND, LOR, LXOR, |
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60 | EQ, NEQ, LT, GT, LE, GE, |
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61 | LIKE, UNLIKE |
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62 | } davqloperator_t; |
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63 | |
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64 | /** |
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65 | * An expression within a DAVQL query. |
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66 | */ |
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67 | typedef struct _davqlexpr DavQLExpression; |
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68 | |
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69 | /** |
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70 | * The structure for type DavQLExpression. |
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71 | */ |
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72 | struct _davqlexpr { |
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73 | /** |
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74 | * The original expression text. |
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75 | * Contains the literal value, if type is LITERAL. |
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76 | */ |
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77 | sstr_t srctext; |
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78 | /** |
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79 | * The expression type. |
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80 | */ |
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81 | davqlexprtype_t type; |
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82 | /** |
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83 | * Operator. |
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84 | * |
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85 | */ |
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86 | davqloperator_t op; |
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87 | /** |
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88 | * Left or single operand. |
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89 | * <code>NULL</code> for literals or identifiers. |
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90 | */ |
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91 | DavQLExpression *left; |
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92 | /** |
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93 | * Right operand. |
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94 | * <code>NULL</code> for literals, identifiers or unary expressions. |
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95 | */ |
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96 | DavQLExpression *right; |
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97 | }; |
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98 | |
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99 | |
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100 | /** |
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101 | * Query statement object. |
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102 | * Contains the binary information about the parsed query. |
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103 | * |
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104 | * The grammar for a DavQLStatement is: |
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105 | * |
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106 | * <pre> |
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107 | * Expression = Expression BinaryOperator Expression |
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108 | * | UnaryOperator Expression |
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109 | * | FunctionCall | Identifier | Literal |
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110 | * | "(", Expression, ")"; |
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111 | * |
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112 | * FunctionCall = Identifier, "(", Expression, ")"; |
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113 | * Identifier = ?Character?, {?Character?}; |
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114 | * Literal = ?Digit?, {?Digit?} | String; |
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115 | * String = "'", {?Character - "'"? | "'''"} , "'"; |
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116 | * |
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117 | * LogicalExpression = LogicalExpression, LogicalOperator, LogicalExpression |
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118 | * | "not ", LogicalExpression |
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119 | * | Expression, Comparison, Expression |
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120 | * | Expression, (" like " | " unlike "), String |
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121 | * | "(", LogicalExpression, ")"; |
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122 | * |
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123 | * UnaryOperator = "-" | "~"; |
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124 | * BinaryOperator = "+" | "-" | "*" | "/" | "&" | "|" | "^"; |
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125 | * LogicalOperator = " and " | " or " | " xor "; |
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126 | * Comparison = | "=" | "<" | ">" | "<=" | ">=" | "!="; |
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127 | * |
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128 | * FieldExpressions = "*", {",", Expression, " as ", String} |
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129 | * | FieldExpression, {",", FieldExpression}; |
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130 | * FieldExpression = Identifier |
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131 | * | Expression, " as ", String; |
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132 | * SetExpressions = SetExpression, {",", {SetExpressions}; |
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133 | * SetExpression = Identifier, "=", Expression; |
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134 | * |
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135 | * WithClause = "depth", "=", Expression; |
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136 | * |
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137 | * </pre> |
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138 | * |
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139 | * Note: mandatory spaces are part of the grammar. But you may also insert an |
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140 | * arbitrary amount of optional spaces between two symbols if they are not part |
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141 | * of an literal or identifier. |
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142 | * |
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143 | * <b>GET:</b> |
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144 | * <pre> |
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145 | * GetStatement = "get ", FieldExpressions, |
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146 | * " from ", Identifier, |
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147 | * [" where ", LogicalExpression], |
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148 | * [" with ", WithClause]; |
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149 | * </pre> |
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150 | * |
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151 | * <b>SET:</b> |
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152 | * <pre> |
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153 | * "set ",SetExpressions, |
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154 | * " at ", Identifier, |
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155 | * (" where ", LogicalExpression) | " anywhere", |
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156 | * [" with ", WithClause]; |
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157 | * </pre> |
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158 | * |
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159 | */ |
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160 | typedef struct { |
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161 | /** |
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162 | * The original query text. |
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163 | */ |
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164 | sstr_t srctext; |
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165 | /** |
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166 | * The statement type. |
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167 | */ |
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168 | davqltype_t type; |
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169 | /** |
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170 | * The list of field expressions. |
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171 | */ |
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172 | UcxList* fields; |
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173 | /** |
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174 | * The list of DavQLExpressions for the new DAV property values. |
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175 | * This is <code>NULL</code> for GET queries. |
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176 | */ |
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177 | UcxList* setvalues; |
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178 | /** |
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179 | * A DavQLExpression that denotes the queried path. |
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180 | */ |
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181 | DavQLExpression path; |
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182 | /** |
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183 | * Logical expression for selection. |
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184 | * <code>NULL</code>, if there is no where clause. |
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185 | */ |
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186 | DavQLExpression* where; |
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187 | /** |
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188 | * The recursion depth for the statement. |
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189 | * Defaults to SIZE_MAX (unbound recursion). |
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190 | */ |
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191 | size_t depth; |
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192 | } DavQLStatement; |
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193 | |
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194 | |
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195 | /** |
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196 | * Starts an interactive debugger for a DavQLStatement. |
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197 | * |
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198 | * @param stmt the statement to debug |
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199 | */ |
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200 | void dav_debug_ql_statement(DavQLStatement *stmt); |
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201 | |
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202 | /** |
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203 | * Parses a statement. |
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204 | * @param stmt the sstr_t containing the statement |
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205 | * @return a DavQLStatement object |
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206 | */ |
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207 | DavQLStatement* dav_parse_statement(sstr_t stmt); |
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208 | |
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209 | /** |
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210 | * Implicitly converts a cstr to a sstr_t and calls dav_parse_statement. |
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211 | */ |
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212 | #define dav_parse_cstr_statement(stmt) dav_parse_statement(S(stmt)) |
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213 | |
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214 | #ifdef __cplusplus |
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215 | } |
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216 | #endif |
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217 | |
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218 | #endif /* DAVQLPARSER_H */ |
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219 |