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/*
* Copyright (c) 2003-2007, 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.
*/
#ifndef _CONTEXT_H
#define _CONTEXT_H
namespace ledger {
class context
{
public:
string description; // ex: 'While parsing file "%R" at line %L'
explicit context(const string& _description) throw()
: description(_description) {}
virtual ~context() {}
};
class file_context : public context
{
public:
path pathname; // ex: ledger.dat
uint_least32_t linenum_beg; // ex: 1010
uint_least32_t linenum_end; // ex: 1010
uint_least32_t position_beg;
uint_least32_t position_end;
optional<uint_least32_t> colnum_beg; // ex: 8
optional<uint_least32_t> colnum_end; // ex: 8
explicit file_context(const path& _pathname,
const uint_least32_t _linenum_beg,
const uint_least32_t _linenum_end,
const uint_least32_t _position_beg,
const uint_least32_t _position_end) throw()
: context(""),
pathname(_pathname),
linenum_beg(_linenum_beg),
linenum_end(_linenum_end),
position_beg(_position_beg),
position_end(_position_end) {}
};
class string_context : public context
{
public:
string text; // ex: (The multi-line text of an entry)
optional<uint_least32_t> linenum_beg_off; // ex: 2
optional<uint_least32_t> linenum_end_off; // ex: 2
optional<uint_least32_t> colnum_beg_off; // ex: 8
optional<uint_least32_t> colnum_end_off; // ex: 8
};
#if 0
class file_context : public error_context
{
protected:
string file;
unsigned long line;
public:
file_context(const string& _file, unsigned long _line,
const string& _desc = "") throw()
: error_context(_desc), file(_file), line(_line) {}
virtual ~file_context() throw() {}
virtual void describe(std::ostream& out) const throw() {
if (! desc.empty())
out << desc << " ";
out << "\"" << file << "\", line " << line << ": ";
}
};
class line_context : public error_context {
public:
string line;
long pos;
line_context(const string& _line, long _pos,
const string& _desc = "") throw()
: error_context(_desc), line(_line), pos(_pos) {}
virtual ~line_context() throw() {}
virtual void describe(std::ostream& out) const throw() {
if (! desc.empty())
out << desc << std::endl;
out << " " << line << std::endl << " ";
long idx = pos < 0 ? line.length() - 1 : pos;
for (int i = 0; i < idx; i++)
out << " ";
out << "^" << std::endl;
}
};
#endif
extern ptr_list<context> context_stack;
#define PUSH_CONTEXT() try {
#define POP_CONTEXT(ctxt) \
} catch (...) { \
context_stack.push_front(new ctxt); \
throw; \
}
} // namespace ledger
#endif // _CONTEXT_H
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