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Copy pathHelpFormatter.cpp
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executable file
·298 lines (247 loc) · 5.72 KB
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//
// HelpFormatter.cpp
//
// $Id: //poco/1.4/Util/src/HelpFormatter.cpp#2 $
//
// Library: Util
// Package: Options
// Module: HelpFormatter
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#include "Poco/Util/HelpFormatter.h"
#include "Poco/Util/OptionSet.h"
#include "Poco/Util/Option.h"
namespace Poco {
namespace Util {
const int HelpFormatter::TAB_WIDTH = 4;
const int HelpFormatter::LINE_WIDTH = 78;
HelpFormatter::HelpFormatter(const OptionSet& options):
_options(options),
_width(LINE_WIDTH),
_indent(0),
_unixStyle(true)
{
#if !defined(POCO_OS_FAMILY_UNIX)
_unixStyle = false;
#endif
_indent = calcIndent();
}
HelpFormatter::~HelpFormatter()
{
}
void HelpFormatter::setCommand(const std::string& command)
{
_command = command;
}
void HelpFormatter::setUsage(const std::string& usage)
{
_usage = usage;
}
void HelpFormatter::setHeader(const std::string& header)
{
_header = header;
}
void HelpFormatter::setFooter(const std::string& footer)
{
_footer = footer;
}
void HelpFormatter::format(std::ostream& ostr) const
{
ostr << "usage: " << _command;
if (!_usage.empty())
{
ostr << ' ';
formatText(ostr, _usage, (int) _command.length() + 1);
}
ostr << '\n';
if (!_header.empty())
{
formatText(ostr, _header, 0);
ostr << "\n\n";
}
formatOptions(ostr);
if (!_footer.empty())
{
ostr << '\n';
formatText(ostr, _footer, 0);
ostr << '\n';
}
}
void HelpFormatter::setWidth(int width)
{
poco_assert (width > 0);
_width = width;
}
void HelpFormatter::setIndent(int indent)
{
poco_assert (indent >= 0 && indent < _width);
_indent = indent;
}
void HelpFormatter::setAutoIndent()
{
_indent = calcIndent();
}
void HelpFormatter::setUnixStyle(bool flag)
{
_unixStyle = flag;
}
int HelpFormatter::calcIndent() const
{
int indent = 0;
for (OptionSet::Iterator it = _options.begin(); it != _options.end(); ++it)
{
int shortLen = (int) it->shortName().length();
int fullLen = (int) it->fullName().length();
int n = 0;
if (_unixStyle && shortLen > 0)
{
n += shortLen + (int) shortPrefix().length();
if (it->takesArgument())
n += (int) it->argumentName().length() + (it->argumentRequired() ? 0 : 2);
if (fullLen > 0) n += 2;
}
if (fullLen > 0)
{
n += fullLen + (int) longPrefix().length();
if (it->takesArgument())
n += 1 + (int) it->argumentName().length() + (it->argumentRequired() ? 0 : 2);
}
n += 2;
if (n > indent)
indent = n;
}
return indent;
}
void HelpFormatter::formatOptions(std::ostream& ostr) const
{
int optWidth = calcIndent();
for (OptionSet::Iterator it = _options.begin(); it != _options.end(); ++it)
{
formatOption(ostr, *it, optWidth);
if (_indent < optWidth)
{
ostr << '\n' << std::string(_indent, ' ');
formatText(ostr, it->description(), _indent, _indent);
}
else
{
formatText(ostr, it->description(), _indent, optWidth);
}
ostr << '\n';
}
}
void HelpFormatter::formatOption(std::ostream& ostr, const Option& option, int width) const
{
int shortLen = (int) option.shortName().length();
int fullLen = (int) option.fullName().length();
int n = 0;
if (_unixStyle && shortLen > 0)
{
ostr << shortPrefix() << option.shortName();
n += (int) shortPrefix().length() + (int) option.shortName().length();
if (option.takesArgument())
{
if (!option.argumentRequired()) { ostr << '['; ++n; }
ostr << option.argumentName();
n += (int) option.argumentName().length();
if (!option.argumentRequired()) { ostr << ']'; ++n; }
}
if (fullLen > 0) { ostr << ", "; n += 2; }
}
if (fullLen > 0)
{
ostr << longPrefix() << option.fullName();
n += (int) longPrefix().length() + (int) option.fullName().length();
if (option.takesArgument())
{
if (!option.argumentRequired()) { ostr << '['; ++n; }
ostr << '=';
++n;
ostr << option.argumentName();
n += (int) option.argumentName().length();
if (!option.argumentRequired()) { ostr << ']'; ++n; }
}
}
while (n < width) { ostr << ' '; ++n; }
}
void HelpFormatter::formatText(std::ostream& ostr, const std::string& text, int indent) const
{
formatText(ostr, text, indent, indent);
}
void HelpFormatter::formatText(std::ostream& ostr, const std::string& text, int indent, int firstIndent) const
{
int pos = firstIndent;
int maxWordLen = _width - indent;
std::string word;
for (std::string::const_iterator it = text.begin(); it != text.end(); ++it)
{
if (*it == '\n')
{
clearWord(ostr, pos, word, indent);
ostr << '\n';
pos = 0;
while (pos < indent) { ostr << ' '; ++pos; }
}
else if (*it == '\t')
{
clearWord(ostr, pos, word, indent);
if (pos < _width) ++pos;
while (pos < _width && pos % TAB_WIDTH != 0)
{
ostr << ' ';
++pos;
}
}
else if (*it == ' ')
{
clearWord(ostr, pos, word, indent);
if (pos < _width) { ostr << ' '; ++pos; }
}
else
{
if (word.length() == maxWordLen)
{
clearWord(ostr, pos, word, indent);
}
else word += *it;
}
}
clearWord(ostr, pos, word, indent);
}
void HelpFormatter::formatWord(std::ostream& ostr, int& pos, const std::string& word, int indent) const
{
if (pos + word.length() > _width)
{
ostr << '\n';
pos = 0;
while (pos < indent) { ostr << ' '; ++pos; }
}
ostr << word;
pos += (int) word.length();
}
void HelpFormatter::clearWord(std::ostream& ostr, int& pos, std::string& word, int indent) const
{
formatWord(ostr, pos, word, indent);
word.clear();
}
std::string HelpFormatter::shortPrefix() const
{
#if defined(POCO_OS_FAMILY_UNIX)
return "-";
#else
return _unixStyle ? "-" : "/";
#endif
}
std::string HelpFormatter::longPrefix() const
{
#if defined(POCO_OS_FAMILY_UNIX)
return "--";
#else
return _unixStyle ? "--" : "/";
#endif
}
} } // namespace Poco::Util