src/server/util/object.c

Sat, 12 Nov 2022 11:01:11 +0100

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Sat, 12 Nov 2022 11:01:11 +0100
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add obj.conf expression parser

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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 2013 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 <cx/string.h>
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30 #include <cx/linked_list.h>
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31 #include <cx/compare.h>
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32
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33 #include "../public/nsapi.h"
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34
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35 #include "object.h"
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36 #include "util.h"
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37 #include "pool.h"
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38 #include "../daemon/func.h"
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41
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42 httpd_object* object_new(pool_handle_t *pool, char *name) {
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43 httpd_object *obj = pool_malloc(pool, sizeof(httpd_object));
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44 obj->pool = pool;
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45 obj->name = name;
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46 obj->path = NULL;
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47
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48 // create directive table
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49 obj->dt = pool_calloc(pool, NUM_NSAPI_TYPES - 1, sizeof(struct dtable));
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50 obj->nd = NUM_NSAPI_TYPES - 1;
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51
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52 return obj;
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53 }
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55 void object_free(httpd_object *obj) {
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56 //free(obj->name);
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57 //free(obj->dt);
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58 }
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60
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61 int object_add_directive(httpd_object *obj, directive *dir, int dt) {
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62 dtable *l = object_get_dtable(obj, dt);
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63 // allocate space for the new directive
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64 if(l->ndir >= l->alloc) {
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65 l->alloc += 8;
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66 directive **drs = pool_realloc(obj->pool, l->dirs, (l->alloc)*sizeof(void*));
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67 if(!drs) {
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68 l->alloc -= 8;
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69 return -1;
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70 }
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71 l->dirs = drs;
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72 }
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73
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74 // add directive
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75 l->dirs[l->ndir++] = dir;
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76 return 0;
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77 }
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79
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80 /* objset functions */
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81 httpd_objset* objset_create(pool_handle_t *pool) {
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82 httpd_objset *os = pool_malloc(pool, sizeof(httpd_objset));
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84 os->obj = pool_calloc(pool, 2, sizeof(void*));
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85 os->pos = 0;
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86
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87 return os;
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88 }
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89
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90 void objset_add_object(pool_handle_t *p, httpd_objset *os, httpd_object *obj) {
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91 if(os->pos != 0 && os->pos % 2 == 0) {
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92 os->obj = pool_realloc(p, os->obj, (os->pos + 2) * sizeof(void*));
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93 }
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94 os->obj[os->pos] = obj;
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95 os->pos++;
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96 }
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97
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98 void httpobjconf_add_object(HTTPObjectConfig *conf, httpd_object *obj) {
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99 conf->nobj++;
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100 conf->objects = realloc(conf->objects, conf->nobj * sizeof(void*));
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101 conf->objects[conf->nobj - 1] = obj;
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102 }
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103
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104
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105 void nsapi_context_next_stage(NSAPIContext *context) {
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106 context->dtable_index = 0;
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107 context->objset_index = -1;
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108 context->last_req_code = REQ_NOACTION;
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109 }
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110
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111
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112 /* ------------------------------ Expression ------------------------------ */
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113
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114 Expression* condition_create(pool_handle_t *pool, CxList *tokens) {
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115
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116
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117
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118 return NULL;
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119 }
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120
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121
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122 typedef struct {
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123 pool_handle_t *pool;
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124 CxList *op_stack;
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125 CxList *ex_stack;
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126 CxList *tokens;
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127 size_t *pos;
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128 int expect_value;
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129 } ExprParser;
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130
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131 typedef struct {
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132 NSAPIExpressionOperator operator;
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133 int expect_value;
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134 int open_parenthesis;
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135 } ExprOpStackItem;
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136
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137 static void expr_free(pool_handle_t *pool, NSAPIExpression *expr) {
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138 if(expr->left) {
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139 expr_free(pool, expr->left);
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140 }
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141 if(expr->right) {
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142 expr_free(pool, expr->right);
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143 }
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144 if(expr->type == NSAPI_EXPRESSION_STRING && expr->value.str.ptr) {
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145 pool_free(pool, (char*)expr->value.str.ptr);
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146 } else if(expr->type == NSAPI_EXPRESSION_VARIABLE && expr->value.var.ptr) {
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147 pool_free(pool, (char*)expr->value.var.ptr);
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148 }
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149 pool_free(pool, expr);
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150 }
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151
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152 static NSAPIExpressionOperator expr_operator(cxstring token) {
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153 if(!cx_strcmp(token, cx_str("+"))) {
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154 return NSAPI_EXPRESSION_ADD;
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155 } else if(!cx_strcmp(token, cx_str("-"))) {
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156 return NSAPI_EXPRESSION_SUB;
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157 } else if(!cx_strcmp(token, cx_str("*"))) {
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158 return NSAPI_EXPRESSION_MUL;
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159 } else if(!cx_strcmp(token, cx_str("/"))) {
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160 return NSAPI_EXPRESSION_DIV;
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161 } else if(!cx_strcmp(token, cx_str("%"))) {
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162 return NSAPI_EXPRESSION_MOD;
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163 } else if(!cx_strcmp(token, cx_str("not"))) {
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164 return NSAPI_EXPRESSION_NOT;
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165 } else if(!cx_strcmp(token, cx_str("and"))) {
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166 return NSAPI_EXPRESSION_AND;
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167 } else if(!cx_strcmp(token, cx_str("or"))) {
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168 return NSAPI_EXPRESSION_OR;
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169 } else if(!cx_strcmp(token, cx_str("xor"))) {
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170 return NSAPI_EXPRESSION_XOR;
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171 } else if(!cx_strcmp(token, cx_str("=="))) {
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172 return NSAPI_EXPRESSION_EQ;
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173 } else if(!cx_strcmp(token, cx_str("!="))) {
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174 return NSAPI_EXPRESSION_NEQ;
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175 } else if(!cx_strcmp(token, cx_str(">"))) {
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176 return NSAPI_EXPRESSION_GT;
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177 } else if(!cx_strcmp(token, cx_str("<"))) {
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178 return NSAPI_EXPRESSION_LT;
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179 } else if(!cx_strcmp(token, cx_str(">="))) {
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180 return NSAPI_EXPRESSION_GE;
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181 } else if(!cx_strcmp(token, cx_str("<="))) {
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182 return NSAPI_EXPRESSION_LE;
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183 }
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184 return NSAPI_EXPRESSION_NOOP;
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185 }
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186
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187 static int token_is_int(cxstring token) {
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188 for(size_t i=0;i<token.length;i++) {
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189 if(!isdigit(token.ptr[i])) {
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190 return 0;
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191 }
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192 }
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193 return 1;
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194 }
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195
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196 static int expr_set_value(pool_handle_t *pool, NSAPIExpression *expr, cxstring token) {
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197 if(token.length >= 2 && token.ptr[0] == '\"' && token.ptr[token.length-1] == '\"') {
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198 expr->value.str = cx_strcast(cx_strdup_a(pool_allocator(pool), cx_strsubsl(token, 1, token.length-2)));
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199 expr->type = NSAPI_EXPRESSION_STRING;
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200 } else if(token.length >= 2 && token.ptr[0] == '$' && isalpha(token.ptr[1])) {
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201 expr->value.var = cx_strcast(cx_strdup_a(pool_allocator(pool), cx_strsubs(token, 1)));
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202 expr->type = NSAPI_EXPRESSION_VARIABLE;
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203 } else if(token_is_int(token)) {
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204 if(!util_strtoint(token.ptr, &expr->value.i)) {
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205 return 1;
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206 }
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207 expr->type = NSAPI_EXPRESSION_INT;
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208 } else if(!strcmp(token.ptr, "true")) {
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209 expr->type = NSAPI_EXPRESSION_BOOL;
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210 expr->value.b = 1;
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211 } else if(!strcmp(token.ptr, "false")) {
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212 expr->type = NSAPI_EXPRESSION_BOOL;
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213 expr->value.b = 0;
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214 } else {
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215 return 1;
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216 }
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217 // TODO: double
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218 return 0;
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219 }
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220
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221 cxstring expr_next_token(CxList *tokens, size_t *pos) {
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222 cxstring *token = cxListAt(tokens, *pos);
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223 if(token) {
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224 (*pos)++;
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225 return *token;
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226 }
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227 return (cxstring){NULL, 0};
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228 }
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229
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230 NSAPIExpression* expr_parser_pop(ExprParser *parser) {
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231 CxList *stack = parser->ex_stack;
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232 if(stack->size == 0) {
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233 return NULL;
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234 }
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235 NSAPIExpression *ret = cxListAt(stack, stack->size-1);
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236 cxListRemove(stack, stack->size-1);
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237 return ret;
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238 }
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239
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240 // takes items from ex_stack and adds a new operator expression to ex_stack
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241 static int expr_add_operator(ExprParser *parser, ExprOpStackItem *op) {
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242 NSAPIExpression *exp = pool_malloc(parser->pool, sizeof(NSAPIExpression));
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243 exp->operator = op->operator;
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244 // op->expect_value == TRUE means, that the operator was found in a case
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245 // a value was expected.
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246 // For example: 1 + - 2
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247 // After + a value is expected, but there is the - operator
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248 // in that case, the - operator is a unary expression
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249 if(op->expect_value) {
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250 // We expected a value but got an operator? This must be an unary operator
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251 exp->type = NSAPI_EXPRESSION_UNARY;
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252 exp->left = expr_parser_pop(parser);
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253 exp->right = NULL;
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254 } else {
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255 // binary operator
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256 exp->type = NSAPI_EXPRESSION_BINARY;
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257 exp->right = expr_parser_pop(parser);
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258 exp->left = expr_parser_pop(parser);
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259 }
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260
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261 if(!exp->left && !exp->right) {
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262 return 1; // error
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263 }
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264
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265 cxListAdd(parser->ex_stack, exp);
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266
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267 parser->expect_value = TRUE;
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268 return 0;
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269 }
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270
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271 // converts the token to a value expression (int, bool, str, ...)
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272 // and adds it to parser->ex_stack
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273 // sets parser->expect_value to false
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274 static int expr_add_value(ExprParser *parser, cxstring token) {
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275 NSAPIExpression *exp = pool_malloc(parser->pool, sizeof(NSAPIExpression));
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276 ZERO(exp, sizeof(NSAPIExpression));
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277 if(expr_set_value(parser->pool, exp, token)) {
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278 return 1;
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279 }
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280 cxListAdd(parser->ex_stack, exp);
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281 parser->expect_value = FALSE;
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282 return 0;
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283 }
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284
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285
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286 static NSAPIExpression* expr_parse_expr(ExprParser *parser) {
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287 CxList *op_stack = parser->op_stack;
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288 CxList *ex_stack = parser->ex_stack;
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289
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290 // Shunting yard algorithm
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291 cxstring token = expr_next_token(parser->tokens, parser->pos);
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292 for(;token.ptr;token=expr_next_token(parser->tokens, parser->pos)) {
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293 NSAPIExpressionOperator op = expr_operator(token);
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294 if(op != NSAPI_EXPRESSION_NOOP) {
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295 ExprOpStackItem new_op;
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296 new_op.operator = op;
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297 new_op.expect_value = parser->expect_value;
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298 new_op.open_parenthesis = FALSE;
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299 while(op_stack->size > 0) {
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300 ExprOpStackItem *stack_item = cxListAt(op_stack, op_stack->size-1);
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301 if(stack_item->operator == NSAPI_EXPRESSION_NOOP) {
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302 break;
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303 }
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304 // check presedence
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305 if(op >= stack_item->operator) {
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306 break;
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307 }
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308 if(expr_add_operator(parser, stack_item)) {
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309 return NULL;
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310 }
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311 cxListRemove(op_stack, op_stack->size-1);
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312 }
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313 cxListAdd(op_stack, &new_op);
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314 parser->expect_value = TRUE;
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315 } else if(token.length == 1 && token.ptr[0] == '(') {
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316 ExprOpStackItem new_op;
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317 new_op.operator = NSAPI_EXPRESSION_NOOP;
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318 new_op.expect_value = 0;
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319 new_op.open_parenthesis = 1;
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320 cxListAdd(op_stack, &new_op);
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321 parser->expect_value = TRUE;
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322 } else if(token.length == 1 && token.ptr[0] == ')') {
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323 int found_open_bracket = FALSE;
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324 while(op_stack->size > 0) {
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325 ExprOpStackItem *stack_item = cxListAt(op_stack, op_stack->size-1);
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326 cxListRemove(op_stack, op_stack->size-1);
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327 if(stack_item->open_parenthesis) {
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328 found_open_bracket = TRUE;
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329 break;
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330 } else {
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331 if(expr_add_operator(parser, stack_item)) {
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332 return NULL;
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333 }
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334 }
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335 }
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336 if(!found_open_bracket) {
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337 return NULL;
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338 }
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339 parser->expect_value = FALSE;
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340 } else {
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341 if(expr_add_value(parser, token)) {
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342 return NULL;
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343 }
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344 }
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345 }
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346
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347 while(op_stack->size > 0) {
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348 ExprOpStackItem *stack_item = cxListAt(op_stack, op_stack->size-1);
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349 if(stack_item->open_parenthesis) {
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350 return NULL;
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351 }
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352 if(expr_add_operator(parser, stack_item)) {
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353 return NULL;
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354 }
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355 cxListRemove(op_stack, op_stack->size-1);
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356 }
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357
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358 if(ex_stack->size != 1) {
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359 return NULL;
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360 }
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361
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362 return cxListAt(ex_stack, 0);
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363 }
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364
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365 NSAPIExpression* expr_parse_logical_expr(pool_handle_t *pool, CxList *tokens, size_t *pos) {
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366 CxList *op_stack = cxLinkedListCreate(pool_allocator(pool), cx_cmp_ptr, sizeof(ExprOpStackItem));
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367 CxList *ex_stack = cxPointerLinkedListCreate(pool_allocator(pool), cx_cmp_ptr);
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368
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369 ExprParser parser;
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370 parser.pool = pool;
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371 parser.op_stack = op_stack;
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372 parser.ex_stack = ex_stack;
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373 parser.tokens = tokens;
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374 parser.pos = pos;
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375 parser.expect_value = TRUE;
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376
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377 NSAPIExpression *ret = expr_parse_expr(&parser);
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378 cxListDestroy(op_stack);
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379 cxListDestroy(ex_stack);
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380
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381 return ret;
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382 }
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383
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384
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385
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386 int condition_evaluate(Condition *condition, Session *sn, Request *rq) {
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387 return 1;
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388 }

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