99313ebc6c
complicated string of pointers, it's now just a global block of text that gets appended to as the error is being thrown up, and can be displayed at the catch point if desired. There are almost no cases where a thrown exception will not result in an error message being displayed to the user.
118 lines
3.4 KiB
C++
118 lines
3.4 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(parse_error, std::runtime_error);
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DECLARE_EXCEPTION(compile_error, std::runtime_error);
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DECLARE_EXCEPTION(calc_error, std::runtime_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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bool is_constant() const;
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value_t& constant_value();
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const value_t& constant_value() 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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