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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab ft=cpp
#ifndef CEPH_RGW_ES_QUERY_H
#define CEPH_RGW_ES_QUERY_H
#include "rgw_string.h"
class ESQueryStack {
list<string> l;
list<string>::iterator iter;
public:
explicit ESQueryStack(list<string>& src) {
assign(src);
}
ESQueryStack() {}
void assign(list<string>& src) {
l.swap(src);
iter = l.begin();
}
bool peek(string *dest) {
if (done()) {
return false;
}
*dest = *iter;
return true;
}
bool pop(string *dest) {
bool valid = peek(dest);
if (!valid) {
return false;
}
++iter;
return true;
}
bool done() {
return (iter == l.end());
}
};
class ESInfixQueryParser {
string query;
int size;
const char *str;
int pos{0};
list<string> args;
void skip_whitespace(const char *str, int size, int& pos);
bool get_next_token(bool (*filter)(char));
bool parse_condition();
bool parse_and_or();
bool parse_specific_char(const char *pchar);
bool parse_open_bracket();
bool parse_close_bracket();
public:
explicit ESInfixQueryParser(const string& _query) : query(_query), size(query.size()), str(query.c_str()) {}
bool parse(list<string> *result);
};
class ESQueryNode;
struct ESEntityTypeMap {
enum EntityType {
ES_ENTITY_NONE = 0,
ES_ENTITY_STR = 1,
ES_ENTITY_INT = 2,
ES_ENTITY_DATE = 3,
};
map<string, EntityType> m;
explicit ESEntityTypeMap(map<string, EntityType>& _m) : m(_m) {}
bool find(const string& entity, EntityType *ptype) {
auto i = m.find(entity);
if (i != m.end()) {
*ptype = i->second;
return true;
}
*ptype = ES_ENTITY_NONE;
return false;
}
};
class ESQueryCompiler {
ESInfixQueryParser parser;
ESQueryStack stack;
ESQueryNode *query_root{nullptr};
string custom_prefix;
bool convert(list<string>& infix, string *perr);
list<pair<string, string> > eq_conds;
ESEntityTypeMap *generic_type_map{nullptr};
ESEntityTypeMap *custom_type_map{nullptr};
map<string, string, ltstr_nocase> *field_aliases = nullptr;
set<string> *restricted_fields = nullptr;
public:
ESQueryCompiler(const string& query, list<pair<string, string> > *prepend_eq_conds, const string& _custom_prefix) : parser(query), custom_prefix(_custom_prefix) {
if (prepend_eq_conds) {
eq_conds = std::move(*prepend_eq_conds);
}
}
~ESQueryCompiler();
bool compile(string *perr);
void dump(Formatter *f) const;
void set_generic_type_map(ESEntityTypeMap *entity_map) {
generic_type_map = entity_map;
}
ESEntityTypeMap *get_generic_type_map() {
return generic_type_map;
}
const string& get_custom_prefix() { return custom_prefix; }
void set_custom_type_map(ESEntityTypeMap *entity_map) {
custom_type_map = entity_map;
}
ESEntityTypeMap *get_custom_type_map() {
return custom_type_map;
}
void set_field_aliases(map<string, string, ltstr_nocase> *fa) {
field_aliases = fa;
}
string unalias_field(const string& field) {
if (!field_aliases) {
return field;
}
auto i = field_aliases->find(field);
if (i == field_aliases->end()) {
return field;
}
return i->second;
}
void set_restricted_fields(set<string> *rf) {
restricted_fields = rf;
}
bool is_restricted(const string& f) {
return (restricted_fields && restricted_fields->find(f) != restricted_fields->end());
}
};
#endif
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