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/*
** Copyright (C) 2022-2023 Dirk-Jan C. Binnema <djcb@djcbsoftware.nl>
**
** This program is free software; you can redistribute it and/or modify it
** under the terms of the GNU General Public License as published by the
** Free Software Foundation; either version 3, or (at your option) any
** later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software Foundation,
** Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
**
*/
#ifndef MU_REGEX_HH__
#define MU_REGEX_HH__
#include <glib.h>
#
#include <utils/mu-result.hh>
#include <utils/mu-utils.hh>
namespace Mu {
/**
* RAII wrapper around a GRegex which in itself is a wrapper around PCRE. We use
* PCRE rather than std::regex because it is much faster.
*/
struct Regex {
#if !GLIB_CHECK_VERSION(2,74,0) /* backward compat */
#define G_REGEX_DEFAULT (static_cast<GRegexCompileFlags>(0))
#define G_REGEX_MATCH_DEFAULT (static_cast<GRegexMatchFlags>(0))
#endif
/**
* Trivial constructor
*
* @return
*/
Regex() noexcept: rx_{} {}
/**
* Construct a new Regex object
*
* @param ptrn PRRE regular expression pattern
* @param cflags compile flags
* @param mflags match flags
*
* @return a Regex object or an error.
*/
static Result<Regex> make(const std::string& ptrn,
GRegexCompileFlags cflags = G_REGEX_DEFAULT,
GRegexMatchFlags mflags = G_REGEX_MATCH_DEFAULT) noexcept try {
return Regex(ptrn.c_str(), cflags, mflags);
} catch (const Error& err) {
return Err(err);
}
/**
* Copy CTOR
*
* @param other some other Regex
*/
Regex(const Regex& other) noexcept: rx_{} { *this = other; }
/**
* Move CTOR
*
* @param other some other Regex
*/
Regex(Regex&& other) noexcept: rx_{} { *this = std::move(other); }
/**
* DTOR
*/
~Regex() noexcept { g_clear_pointer(&rx_, g_regex_unref); }
/**
* Cast to the underlying GRegex*
*
* @return a GRegex*
*/
operator const GRegex*() const noexcept { return rx_; }
/**
* Doe this object contain a valid GRegex*?
*
* @return true or false
*/
operator bool() const noexcept { return !!rx_; }
/**
* operator=
*
* @param other copy some other object to this one
*
* @return *this
*/
Regex& operator=(const Regex& other) noexcept {
if (this != &other) {
g_clear_pointer(&rx_, g_regex_unref);
if (other.rx_)
rx_ = g_regex_ref(other.rx_);
}
return *this;
}
/**
* operator=
*
* @param other move some other object to this one
*
* @return *this
*/
Regex& operator=(Regex&& other) noexcept {
if (this != &other) {
g_clear_pointer(&rx_, g_regex_unref);
rx_ = other.rx_;
other.rx_ = nullptr;
}
return *this;
}
/**
* Does this regexp match the given string? An unset Regex matches
* nothing.
*
* @param str string to test
* @param mflags match flags
*
* @return true or false
*/
bool matches(const std::string& str,
GRegexMatchFlags mflags=G_REGEX_MATCH_DEFAULT) const noexcept {
if (!rx_)
return false;
else
return g_regex_match(rx_, str.c_str(), mflags, nullptr);
// strangely, valgrind reports some memory error related to
// the str.c_str(). It *seems* like a false alarm.
}
/**
* Replace all occurrences of @this regexp in some string with a
* replacement string
*
* @param str some string
* @param repl replacement string
*
* @return string or error
*/
Result<std::string> replace(const std::string& str, const std::string& repl) const {
GError *gerr{};
if (!rx_)
return Err(Error::Code::InvalidArgument, "missing regexp");
else if (auto&& s{g_regex_replace(rx_, str.c_str(), str.length(), 0,
repl.c_str(), G_REGEX_MATCH_DEFAULT, &gerr)}; !s)
return Err(Error::Code::InvalidArgument, &gerr, "error in Regex::replace");
else
return Ok(to_string_gchar(std::move(s)));
}
const GRegex* g_regex() const { return rx_; }
private:
Regex(const char *ptrn, GRegexCompileFlags cflags, GRegexMatchFlags mflags) {
GError *err{};
if (rx_ = g_regex_new(ptrn, cflags, mflags, &err); !rx_)
throw Error{Error::Code::InvalidArgument, &err,
"invalid regexp: '{}'", ptrn};
}
GRegex *rx_{};
};
static inline std::string format_as(const Regex& rx) {
if (auto&& grx{rx.g_regex()}; !grx)
return "//";
else
return mu_format("/{}/", g_regex_get_pattern(grx));
}
} // namespace Mu
#endif /* MU_REGEX_HH__ */
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