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#ifndef _FORMAT_H
#define _FORMAT_H
#include "xpath.h"
#include "error.h"
#include "debug.h"
#include <list>
namespace ledger {
class format_t
{
public:
struct element_t
{
bool align_left;
short min_width;
short max_width;
enum kind_t { UNKNOWN, TEXT, COLUMN, XPATH, GROUP } kind;
union {
string * chars;
xml::xpath_t * xpath;
format_t * format;
};
element_t()
: align_left(false), min_width(-1), max_width(-1),
kind(UNKNOWN), chars(NULL) {
TRACE_CTOR("element_t()");
}
~element_t() {
TRACE_DTOR("element_t");
switch (kind) {
case TEXT:
delete chars;
break;
case XPATH:
delete xpath;
break;
case GROUP:
delete format;
break;
default:
assert(! chars);
break;
}
}
private:
element_t(const element_t& other);
};
struct element_formatter_t {
virtual ~element_formatter_t() {}
virtual int operator()(std::ostream& out, element_t * element,
xml::node_t * context, int column) const;
};
string format_string;
std::list<element_t *> elements;
private:
format_t(const format_t&);
public:
format_t() {
TRACE_CTOR("format_t()");
}
format_t(const string& fmt) {
TRACE_CTOR("format_t(const string&)");
parse(fmt);
}
void clear_elements() {
for (std::list<element_t *>::iterator i = elements.begin();
i != elements.end();
i++)
delete *i;
elements.clear();
}
virtual ~format_t() {
TRACE_DTOR("format_t");
clear_elements();
}
void parse(const string& fmt);
void compile(const string& fmt, xml::node_t * context = NULL) {
parse(fmt);
compile(context);
}
void compile(xml::node_t * context = NULL);
int format(std::ostream& out, xml::node_t * context = NULL,
int column = 0, const element_formatter_t& formatter =
element_formatter_t()) const;
operator bool() const {
return ! format_string.empty();
}
};
class format_error : public error {
public:
format_error(const string& reason, error_context * ctxt = NULL) throw()
: error(reason, ctxt) {}
virtual ~format_error() throw() {}
};
} // namespace ledger
#endif // _FORMAT_H
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