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/*
* Copyright (c) 2003-2023, John Wiegley. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of New Artisans LLC nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* @addtogroup expr
*/
/**
* @file expr.h
* @author John Wiegley
*
* @ingroup expr
*/
#pragma once
#include "exprbase.h"
#include "value.h"
namespace ledger {
class expr_t : public expr_base_t<value_t>
{
class parser_t;
typedef expr_base_t<value_t> base_type;
public:
struct token_t;
class op_t;
typedef intrusive_ptr<op_t> ptr_op_t;
typedef intrusive_ptr<const op_t> const_ptr_op_t;
enum check_expr_kind_t {
EXPR_GENERAL,
EXPR_ASSERTION,
EXPR_CHECK
};
typedef std::pair<expr_t, check_expr_kind_t> check_expr_pair;
typedef std::list<check_expr_pair> check_expr_list;
protected:
ptr_op_t ptr;
public:
expr_t();
expr_t(const expr_t& other);
expr_t(ptr_op_t _ptr, scope_t * _context = NULL);
expr_t(const string& _str, const parse_flags_t& flags = PARSE_DEFAULT);
expr_t(std::istream& in, const parse_flags_t& flags = PARSE_DEFAULT);
virtual ~expr_t();
expr_t& operator=(const expr_t& _expr);
virtual operator bool() const throw();
ptr_op_t get_op() throw();
void parse(const string& str, const parse_flags_t& flags = PARSE_DEFAULT) {
std::istringstream stream(str);
return parse(stream, flags, str);
}
virtual void parse(std::istream& in,
const parse_flags_t& flags = PARSE_DEFAULT,
const optional<string>& original_string = none);
virtual void compile(scope_t& scope);
virtual value_t real_calc(scope_t& scope);
bool is_constant() const;
value_t& constant_value();
const value_t& constant_value() const;
bool is_function() const;
func_t& get_function();
virtual string context_to_str() const;
virtual void print(std::ostream& out) const;
virtual void dump(std::ostream& out) const;
};
/**
* Dealing with expr pointers tucked into value objects.
*/
inline bool is_expr(const value_t& val) {
return val.is_any() && val.as_any().type() == typeid(expr_t::ptr_op_t);
}
expr_t::ptr_op_t as_expr(const value_t& val);
void set_expr(value_t& val, expr_t::ptr_op_t op);
value_t expr_value(expr_t::ptr_op_t op);
// A merged expression allows one to set an expression term, "foo", and
// a base expression, "bar", and then merge in later expressions that
// utilize foo. For example:
//
// foo: bar
// merge: foo * 10
// merge: foo + 20
//
// When this expression is finally compiled, the base and merged
// elements are written into this:
//
// __tmp=(foo=bar; foo=foo*10; foo=foo+20);__tmp
//
// This allows users to select flags like -O, -B or -I at any time, and
// also combine flags such as -V and -A.
class merged_expr_t : public expr_t
{
public:
string term;
string base_expr;
string merge_operator;
std::list<string> exprs;
merged_expr_t(const string& _term, const string& expr,
const string& merge_op = ";")
: expr_t(), term(_term), base_expr(expr), merge_operator(merge_op) {
TRACE_CTOR(merged_expr_t, "string, string, string");
}
virtual ~merged_expr_t() {
TRACE_DTOR(merged_expr_t);
}
void set_term(const string& _term) {
term = _term;
}
void set_base_expr(const string& expr) {
base_expr = expr;
}
void set_merge_operator(const string& merge_op) {
merge_operator = merge_op;
}
bool check_for_single_identifier(const string& expr);
void prepend(const string& expr) {
if (! check_for_single_identifier(expr))
exprs.push_front(expr);
}
void append(const string& expr) {
if (! check_for_single_identifier(expr))
exprs.push_back(expr);
}
void remove(const string& expr) {
exprs.remove(expr);
}
virtual void compile(scope_t& scope);
};
class call_scope_t;
value_t source_command(call_scope_t& scope);
} // namespace ledger
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