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/// @file
/// @brief grammar: Value expression productions
#ifndef EXPR_HH
#define EXPR_HH
#include "prod.hh"
#include <string>
using std::shared_ptr;
using std::vector;
using std::string;
struct value_expr: prod {
sqltype *type;
virtual void out(std::ostream &out) = 0;
virtual ~value_expr() { }
value_expr(prod *p) : prod(p) { }
static shared_ptr<value_expr> factory(prod *p, sqltype *type_constraint = 0);
};
struct case_expr : value_expr {
shared_ptr<value_expr> condition;
shared_ptr<value_expr> true_expr;
shared_ptr<value_expr> false_expr;
case_expr(prod *p, sqltype *type_constraint = 0);
virtual void out(std::ostream &out);
virtual void accept(prod_visitor *v);
};
struct funcall : value_expr {
routine *proc;
bool is_aggregate;
vector<shared_ptr<value_expr> > parms;
virtual void out(std::ostream &out);
virtual ~funcall() { }
funcall(prod *p, sqltype *type_constraint = 0, bool agg = 0);
virtual void accept(prod_visitor *v) {
v->visit(this);
for (auto p : parms)
p->accept(v);
}
};
struct atomic_subselect : value_expr {
table *tab;
column *col;
int offset;
routine *agg;
atomic_subselect(prod *p, sqltype *type_constraint = 0);
virtual void out(std::ostream &out);
};
struct const_expr: value_expr {
std::string expr;
const_expr(prod *p, sqltype *type_constraint = 0);
virtual void out(std::ostream &out) { out << expr; }
virtual ~const_expr() { }
};
struct column_reference: value_expr {
column_reference(prod *p, sqltype *type_constraint = 0);
virtual void out(std::ostream &out) { out << reference; }
std::string reference;
virtual ~column_reference() { }
};
struct coalesce : value_expr {
const char *abbrev_;
vector<shared_ptr<value_expr> > value_exprs;
virtual ~coalesce() { };
coalesce(prod *p, sqltype *type_constraint = 0, const char *abbrev = "coalesce");
virtual void out(std::ostream &out);
virtual void accept(prod_visitor *v) {
v->visit(this);
for (auto p : value_exprs)
p->accept(v);
}
};
struct nullif : coalesce {
virtual ~nullif() { };
nullif(prod *p, sqltype *type_constraint = 0)
: coalesce(p, type_constraint, "nullif")
{ };
};
struct bool_expr : value_expr {
virtual ~bool_expr() { }
bool_expr(prod *p) : value_expr(p) { type = scope->schema->booltype; }
static shared_ptr<bool_expr> factory(prod *p);
};
struct truth_value : bool_expr {
virtual ~truth_value() { }
const char *op;
virtual void out(std::ostream &out) { out << op; }
truth_value(prod *p) : bool_expr(p) {
op = ( (d6() < 4) ? scope->schema->true_literal : scope->schema->false_literal);
}
};
struct null_predicate : bool_expr {
virtual ~null_predicate() { }
const char *negate;
shared_ptr<value_expr> expr;
null_predicate(prod *p) : bool_expr(p) {
negate = ((d6()<4) ? "not " : "");
expr = value_expr::factory(this);
}
virtual void out(std::ostream &out) {
out << *expr << " is " << negate << "NULL";
}
virtual void accept(prod_visitor *v) {
v->visit(this);
expr->accept(v);
}
};
struct exists_predicate : bool_expr {
shared_ptr<struct query_spec> subquery;
virtual ~exists_predicate() { }
exists_predicate(prod *p);
virtual void out(std::ostream &out);
virtual void accept(prod_visitor *v);
};
struct bool_binop : bool_expr {
shared_ptr<value_expr> lhs, rhs;
bool_binop(prod *p) : bool_expr(p) { }
virtual void out(std::ostream &out) = 0;
virtual void accept(prod_visitor *v) {
v->visit(this);
lhs->accept(v);
rhs->accept(v);
}
};
struct bool_term : bool_binop {
virtual ~bool_term() { }
const char *op;
virtual void out(std::ostream &out) {
out << "(" << *lhs << ") ";
indent(out);
out << op << " (" << *rhs << ")";
}
bool_term(prod *p) : bool_binop(p)
{
op = ((d6()<4) ? "or" : "and");
lhs = bool_expr::factory(this);
rhs = bool_expr::factory(this);
}
};
struct distinct_pred : bool_binop {
distinct_pred(prod *p);
virtual ~distinct_pred() { };
virtual void out(std::ostream &o) {
o << *lhs << " is distinct from " << *rhs;
}
};
struct comparison_op : bool_binop {
op *oper;
comparison_op(prod *p);
virtual ~comparison_op() { };
virtual void out(std::ostream &o) {
o << *lhs << " " << oper->name << " " << *rhs;
}
};
struct window_function : value_expr {
virtual void out(std::ostream &out);
virtual ~window_function() { }
window_function(prod *p, sqltype *type_constraint);
vector<shared_ptr<column_reference> > partition_by;
vector<shared_ptr<column_reference> > order_by;
shared_ptr<funcall> aggregate;
static bool allowed(prod *pprod);
virtual void accept(prod_visitor *v) {
v->visit(this);
aggregate->accept(v);
for (auto p : partition_by)
p->accept(v);
for (auto p : order_by)
p->accept(v);
}
};
#endif
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