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