sources/mystring.cpp

/*
	Copyright 2014 Teemu Piippo
	All rights reserved.

	Redistribution and use in source and binary forms, with or without
	modification, are permitted provided that the following conditions
	are met:

	1. Redistributions of source code must retain the above copyright
	   notice, this list of conditions and the following disclaimer.
	2. Redistributions in binary form must reproduce the above copyright
	   notice, this list of conditions and the following disclaimer in the
	   documentation and/or other materials provided with the distribution.
	3. Neither the name of the copyright holder nor the names of its
	   contributors may be used to endorse or promote products derived from
	   this software without specific prior written permission.

	THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
	TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
	PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER
	OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
	EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
	PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
	PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
	LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
	NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
	SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#include <cstring>
#include "main.h"
#include "mystring.h"
#include "format.h"
#include "md5.h"

// -------------------------------------------------------------------------------------------------
//
METHOD
String::compare (const String& other) const -> int
{
	return m_string.compare (other.std_string());
}

// -------------------------------------------------------------------------------------------------
//
METHOD
String::trim (int n) -> void
{
	if (n > 0)
		m_string = mid (0, length() - n).std_string();
	else
		m_string = mid (n, -1).std_string();
}

// -------------------------------------------------------------------------------------------------
//
METHOD
String::strip (const List<char>& unwanted) -> String
{
	String copy (m_string);

	for (char c : unwanted)
	{
		for (int pos = 0; (pos = copy.find (String (c))) != -1;)
			copy.remove_at (pos--);
	}

	return copy;
}

// -------------------------------------------------------------------------------------------------
//
METHOD
String::to_uppercase() const -> String
{
	String newstr (m_string);

	for (char& c : newstr)
	{
		if (c >= 'a' and c <= 'z')
			c -= 'a' - 'A';
	}

	return newstr;
}

// -------------------------------------------------------------------------------------------------
//
METHOD
String::to_lowercase() const -> String
{
	String newstr (m_string);

	for (char& c : newstr)
	{
		if (c >= 'A' and c <= 'Z')
			c += 'a' - 'A';
	}

	return newstr;
}

// -------------------------------------------------------------------------------------------------
//
METHOD
String::split (char del) const -> StringList
{
	String delimstr;
	delimstr += del;
	return split (delimstr);
}

// -------------------------------------------------------------------------------------------------
//
METHOD
String::split (const String& del) const -> StringList
{
	StringList res;
	int a = 0;
	int b;

	// Find all separators and store the text left to them.
	while ((b = find (del, a)) != -1)
	{
		String sub = mid (a, b);

		if (sub.length() > 0)
			res << sub;

		a = b + del.length();
	}

	// Add the string at the right of the last separator
	if (a < (int) length())
		res.append (mid (a, length()));

	return res;
}

// -------------------------------------------------------------------------------------------------
//
METHOD
String::replace (const char* a, const char* b) -> void
{
	long pos;

	while ((pos = find (a)) != -1)
		m_string = m_string.replace (pos, strlen (a), b);
}

// -------------------------------------------------------------------------------------------------
//
METHOD
String::count (char needle) const -> int
{
	int needles = 0;

	for (const char & c : m_string)
		if (c == needle)
			needles++;

	return needles;
}

// -------------------------------------------------------------------------------------------------
//
METHOD
String::mid (long a, long b) const -> String
{
	if (b == -1 or b > length())
		b = length();

	if (b == a)
		return "";

	if (b < a)
		swap (a, b);

	if (a == 0 and b == length())
		return *this;

	char* newstr = new char[b - a + 1];
	strncpy (newstr, chars() + a, b - a);
	newstr[b - a] = '\0';
	String other (newstr);
	delete[] newstr;
	return other;
}

// -------------------------------------------------------------------------------------------------
//
METHOD
String::word_position (int n) const -> int
{
	int count = 0;

	for (int i = 0; i < length(); ++i)
	{
		if (not isspace (m_string[i]) or ++count < n)
			continue;

		return i;
	}

	return -1;
}

// -------------------------------------------------------------------------------------------------
//
METHOD
String::find (const char* c, int a) const -> int
{
	int pos = m_string.find (c, a);

	if (pos == int (std::string::npos))
		return -1;

	return pos;
}

// -------------------------------------------------------------------------------------------------
//
METHOD
String::find_last (const char* c, int a) const -> int
{
	if (a == -1 or a >= length())
		a = length() - 1;

	for (; a > 0; a--)
		if (m_string[a] == c[0] and strncmp (chars() + a, c, strlen (c)) == 0)
			return a;

	return -1;
}

// -------------------------------------------------------------------------------------------------
//
METHOD
String::to_int (bool* ok, int base) const -> long
{
	errno = 0;
	char* endptr;
	long i = strtol (chars(), &endptr, base);

	if (ok)
		*ok = (errno == 0 and *endptr == '\0');

	return i;
}

// -------------------------------------------------------------------------------------------------
//
METHOD
String::to_float (bool* ok) const -> float
{
	errno = 0;
	char* endptr;
	float i = strtof (chars(), &endptr);

	if (ok != nullptr)
		*ok = (errno == 0 and *endptr == '\0');

	return i;
}

// -------------------------------------------------------------------------------------------------
//
METHOD
String::to_double (bool* ok) const -> double
{
	errno = 0;
	char* endptr;
	double i = strtod (chars(), &endptr);

	if (ok != nullptr)
		*ok = (errno == 0 and *endptr == '\0');

	return i;
}

// -------------------------------------------------------------------------------------------------
//
METHOD
String::operator+ (const String& data) const -> String
{
	String newString = *this;
	newString.append (data);
	return newString;
}

// -------------------------------------------------------------------------------------------------
//
METHOD
String::operator+ (const char* data) const -> String
{
	String newstr = *this;
	newstr.append (data);
	return newstr;
}

// -------------------------------------------------------------------------------------------------
//
METHOD
String::is_numeric() const -> bool
{
	bool gotDot = false;

	for (const char & c : m_string)
	{
		// Allow leading hyphen for negatives
		if (&c == &m_string[0] and c == '-')
			continue;

		// Check for decimal point
		if (!gotDot and c == '.')
		{
			gotDot = true;
			continue;
		}

		if (c >= '0' and c <= '9')
			continue; // Digit

		// If the above cases didn't catch this character, it was
		// illegal and this is therefore not a number.
		return false;
	}

	return true;
}

// -------------------------------------------------------------------------------------------------
//
METHOD
String::ends_with (const String& other) -> bool
{
	if (length() < other.length())
		return false;

	const int ofs = length() - other.length();
	return strncmp (chars() + ofs, other.chars(), other.length()) == 0;
}

// -------------------------------------------------------------------------------------------------
//
METHOD
String::starts_with (const String& other) -> bool
{
	if (length() < other.length())
		return false;

	return strncmp (chars(), other.chars(), other.length()) == 0;
}

// -------------------------------------------------------------------------------------------------
//
METHOD
String::sprintf (const char* fmtstr, ...) -> void
{
	char* buf;
	int bufsize = 256;
	va_list va;
	va_start (va, fmtstr);

	do
		buf = new char[bufsize];
	while (vsnprintf (buf, bufsize, fmtstr, va) >= bufsize);

	va_end (va);
	m_string = buf;
	delete[] buf;
}

// -------------------------------------------------------------------------------------------------
//
METHOD
StringList::join (const String& delim) -> String
{
	String result;

	for (const String& it : container())
	{
		if (result.is_empty() == false)
			result += delim;

		result += it;
	}

	return result;
}

// -------------------------------------------------------------------------------------------------
//
METHOD
String::mask_against (const String& pattern) const -> bool
{
	// Elevate to uppercase for case-insensitive matching
	String pattern_upper = pattern.to_uppercase();
	String this_upper = to_uppercase();
	const char* maskstring = pattern_upper.chars();
	const char* mptr = &maskstring[0];

	for (const char* sptr = this_upper.chars(); *sptr != '\0'; sptr++)
	{
		if (*mptr == '?')
		{
			if (*(sptr + 1) == '\0')
			{
				// ? demands that there's a character here and there wasn't.
				// Therefore, mask matching fails
				return false;
			}
		}
		else if (*mptr == '*')
		{
			char end = *(++mptr);

			// If '*' is the final character of the message, all of the remaining
			// string matches against the '*'. We don't need to bother checking
			// the string any further.
			if (end == '\0')
				return true;

			// Skip to the end character
			while (*sptr != end and *sptr != '\0')
				sptr++;

			// String ended while the mask still had stuff
			if (*sptr == '\0')
				return false;
		}
		else if (*sptr != *mptr)
			return false;

		mptr++;
	}

	return true;
}

// -------------------------------------------------------------------------------------------------
//
METHOD
String::from_number (int a) -> String
{
	char buf[32];
	::sprintf (buf, "%d", a);
	return String (buf);
}

// -------------------------------------------------------------------------------------------------
//
METHOD
String::from_number (long a) -> String
{
	char buf[32];
	::sprintf (buf, "%ld", a);
	return String (buf);
}

// -------------------------------------------------------------------------------------------------
//
METHOD
String::from_number (unsigned long a) -> String
{
	char buf[32];
	::sprintf (buf, "%lu", a);
	return String (buf);
}

// -------------------------------------------------------------------------------------------------
//
METHOD
String::from_number (double a) -> String
{
	char buf[64];
	::sprintf (buf, "%f", a);
	return String (buf);
}

// -------------------------------------------------------------------------------------------------
//
METHOD
String::md5() const -> String
{
	char checksum[33];
	CalculateMD5 (reinterpret_cast<const unsigned char*> (chars()), length(), checksum);
	checksum[sizeof checksum - 1] = '\0';
	return String (checksum);
}

// -------------------------------------------------------------------------------------------------
//
METHOD
String::normalize (int (*filter)(int)) -> void
{
	int a = 0;
	int b = length() - 1;

	while ((*filter) (m_string[a]) and a != b)
		++a;

	while ((*filter) (m_string[b]) and a != b)
		--b;

	if (a == b)
		m_string = "";
	else if (a != 0 or b != length() - 1)
		m_string = m_string.substr (a, b - a + 1);
}