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format: implement generic format parser and printer

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This commit is contained in:
Andrzej Rybczak
2014-11-10 00:31:53 +01:00
parent 25708093e6
commit 8d24c42261
31 changed files with 640 additions and 408 deletions
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137
src/song.cpp
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@@ -42,7 +42,9 @@ size_t calc_hash(const char* s, unsigned seed = 0)
}
namespace MPD {//
namespace MPD {
std::string Song::TagsSeparator = " | ";
std::string Song::get(mpd_tag_type type, unsigned idx) const
{
@@ -197,7 +199,7 @@ std::string Song::getPriority(unsigned idx) const
return boost::lexical_cast<std::string>(getPrio());
}
std::string MPD::Song::getTags(GetFunction f, const std::string &tags_separator) const
std::string MPD::Song::getTags(GetFunction f) const
{
assert(m_song);
unsigned idx = 0;
@@ -205,7 +207,7 @@ std::string MPD::Song::getTags(GetFunction f, const std::string &tags_separator)
for (std::string tag; !(tag = (this->*f)(idx)).empty(); ++idx)
{
if (!result.empty())
result += tags_separator;
result += TagsSeparator;
result += tag;
}
return result;
@@ -259,13 +261,6 @@ bool Song::empty() const
return m_song.get() == 0;
}
std::string Song::toString(const std::string &fmt, const std::string &tags_separator, const std::string &escape_chars) const
{
assert(m_song);
std::string::const_iterator it = fmt.begin();
return ParseFormat(it, tags_separator, escape_chars);
}
std::string Song::ShowTime(unsigned length)
{
int hours = length/3600;
@@ -282,126 +277,4 @@ std::string Song::ShowTime(unsigned length)
return result;
}
void MPD::Song::validateFormat(const std::string &fmt)
{
int braces = 0;
for (std::string::const_iterator it = fmt.begin(); it != fmt.end(); ++it)
{
if (*it == '{')
++braces;
else if (*it == '}')
--braces;
}
if (braces)
throw std::runtime_error("number of opening and closing braces is not equal");
for (size_t i = fmt.find('%'); i != std::string::npos; i = fmt.find('%', i))
{
if (isdigit(fmt[++i]))
while (isdigit(fmt[++i])) { }
if (!charToGetFunction(fmt[i]))
throw std::runtime_error(
(boost::format("invalid character at position %1%: %2%") % (i+1) % fmt[i]).str()
);
}
}
std::string Song::ParseFormat(std::string::const_iterator &it, const std::string &tags_separator,
const std::string &escape_chars) const
{
std::string result;
bool has_some_tags = 0;
MPD::Song::GetFunction get_fun = 0;
while (*++it != '}')
{
while (*it == '{')
{
std::string tags = ParseFormat(it, tags_separator, escape_chars);
if (!tags.empty())
{
has_some_tags = 1;
result += tags;
}
}
if (*it == '}')
break;
if (*it == '%')
{
size_t delimiter = 0;
if (isdigit(*++it))
{
delimiter = atol(&*it);
while (isdigit(*++it)) { }
}
if (*it == '%')
{
result += *it;
get_fun = 0;
}
else
get_fun = charToGetFunction(*it);
if (get_fun)
{
std::string tag = getTags(get_fun, tags_separator);
if (!escape_chars.empty()) // prepend format escape character to all given chars to escape
{
for (size_t i = 0; i < escape_chars.length(); ++i)
for (size_t j = 0; (j = tag.find(escape_chars[i], j)) != std::string::npos; j += 2)
tag.replace(j, 1, std::string(1, FormatEscapeCharacter) + escape_chars[i]);
}
if (!tag.empty() && (get_fun != &MPD::Song::getLength || getDuration() > 0))
{
if (delimiter && tag.size() > delimiter)
{
// Shorten length string by just chopping off the tail
if (get_fun == &MPD::Song::getLength)
tag = tag.substr(0, delimiter);
else
tag = ToString(wideShorten(ToWString(tag), delimiter));
}
has_some_tags = 1;
result += tag;
}
else
break;
}
}
else
result += *it;
}
int brace_counter = 0;
if (*it != '}' || !has_some_tags)
{
for (; *it != '}' || brace_counter; ++it)
{
if (*it == '{')
++brace_counter;
else if (*it == '}')
--brace_counter;
}
if (*++it == '|')
return ParseFormat(++it, tags_separator, escape_chars);
else
return "";
}
else
{
if (*(it+1) == '|')
{
for (; *it != '}' || *(it+1) == '|' || brace_counter; ++it)
{
if (*it == '{')
++brace_counter;
else if (*it == '}')
--brace_counter;
}
}
++it;
return result;
}
}
}