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old system (for example, the meaning of 'a') has yet to be restored. In the new scheme, this will be done by definition a function outside of the value expression logic, rather than the tight coupling between journal innards and value expressions that occurred in 2.x.
114 lines
3.2 KiB
C++
114 lines
3.2 KiB
C++
/*
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* Copyright (c) 2003-2008, John Wiegley. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* - Neither the name of New Artisans LLC nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _EXPR_H
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#define _EXPR_H
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#include "value.h"
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namespace ledger {
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DECLARE_EXCEPTION(error, parse_error);
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DECLARE_EXCEPTION(error, compile_error);
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DECLARE_EXCEPTION(error, calc_error);
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class scope_t;
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class call_scope_t;
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typedef function<value_t (call_scope_t&)> function_t;
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class expr_t
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{
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struct token_t;
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class parser_t;
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static std::auto_ptr<parser_t> parser;
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public:
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class op_t;
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typedef intrusive_ptr<op_t> ptr_op_t;
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private:
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ptr_op_t ptr;
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string str;
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static void initialize();
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static void shutdown();
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friend class session_t;
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public:
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expr_t();
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expr_t(const expr_t& other);
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expr_t(const ptr_op_t& _ptr, const string& _str = "");
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expr_t(const string& _str, const unsigned int flags = 0);
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expr_t(std::istream& in, const unsigned int flags = 0);
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virtual ~expr_t() throw();
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expr_t& operator=(const expr_t& _expr);
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expr_t& operator=(const string& _expr) {
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parse(_expr);
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return *this;
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}
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operator bool() const throw() {
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return ptr.get() != NULL;
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}
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string text() const throw() {
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return str;
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}
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// This has special use in the textual parser
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void set_text(const string& txt) {
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str = txt;
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}
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void parse(const string& _str, const unsigned int flags = 0);
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void parse(std::istream& in, const unsigned int flags = 0);
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void compile(scope_t& scope);
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value_t calc(scope_t& scope) const;
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void print(std::ostream& out, scope_t& scope) const;
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void dump(std::ostream& out) const;
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void read(std::ostream& in);
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void read(const char *& data);
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void write(std::ostream& out) const;
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static value_t eval(const string& _expr, scope_t& scope);
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};
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} // namespace ledger
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#endif // _EXPR_H
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