projects/ldc: lphobos/std/string.d comparison

comparison lphobos/std/string.d @ 108:288fe1029e1f trunk

[svn r112] Fixed 'case 1,2,3:' style case statements. Fixed a bunch of bugs with return/break/continue in loops. Fixed support for the DMDFE hidden implicit return value variable. This can be needed for some foreach statements where the loop body is converted to a nested delegate, but also possibly returns from the function. Added std.math to phobos. Added AA runtime support code, done ground work for implementing AAs. Several other bugfixes.

author	lindquist
date	Tue, 20 Nov 2007 05:29:20 +0100
parents
children	373489eeaf90

comparison

equal deleted inserted replaced

-:3efbcc81ba45
+:288fe1029e1f
+// Written in the D programming language.
+/**
+* String handling functions.
+*
+* To copy or not to copy?
+* When a function takes a string as a parameter, and returns a string,
+* is that string the same as the input string, modified in place, or
+* is it a modified copy of the input string? The D array convention is
+* "copy-on-write". This means that if no modifications are done, the
+* original string (or slices of it) can be returned. If any modifications
+* are done, the returned string is a copy.
+*
+* Macros:
+*	WIKI = Phobos/StdString
+* Copyright:
+*	Public Domain
+*/
+/* Author:
+*	Walter Bright, Digital Mars, www.digitalmars.com
+*/
+// The code is not optimized for speed, that will have to wait
+// until the design is solidified.
+module std.string;
+//debug=string;		// uncomment to turn on debugging printf's
+//private import std.stdio;
+private import std.c.stdio;
+private import std.c.stdlib;
+private import std.c.string;
+private import std.utf;
+private import std.uni;
+private import std.array;
+private import std.format;
+private import std.ctype;
+private import std.stdarg;
+extern (C)
+{
+size_t wcslen(wchar *);
+int wcscmp(wchar *, wchar *);
+}
+/* ************* Exceptions *************** */
+/// Thrown on errors in string functions.
+class StringException : Exception
+{
+this(char[] msg)	/// Constructor
+{
+	super(msg);
+}
+}
+/* ************* Constants *************** */
+const char[16] hexdigits = "0123456789ABCDEF";			/// 0..9A..F
+const char[10] digits    = "0123456789";			/// 0..9
+const char[8]  octdigits = "01234567";				/// 0..7
+const char[26] lowercase = "abcdefghijklmnopqrstuvwxyz";	/// a..z
+const char[26] uppercase = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";	/// A..Z
+const char[52] letters   = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+			   "abcdefghijklmnopqrstuvwxyz";	/// A..Za..z
+const char[6] whitespace = " \t\v\r\n\f";			/// ASCII whitespace
+const dchar LS = '\u2028';	/// UTF line separator
+const dchar PS = '\u2029';	/// UTF paragraph separator
+/// Newline sequence for this system
+version (Windows)
+const char[2] newline = "\r\n";
+else version (linux)
+const char[1] newline = "\n";
+/**********************************
+* Returns true if c is whitespace
+*/
+bool iswhite(dchar c)
+{
+return (c <= 0x7F)
+		? find(whitespace, c) != -1
+		: (c == PS || c == LS);
+}
+/*********************************
+* Convert string to integer.
+*/
+long atoi(char[] s)
+{
+return std.c.stdlib.atoi(toStringz(s));
+}
+/*************************************
+* Convert string to real.
+*/
+real atof(char[] s)
+{   char* endptr;
+auto result = strtold(toStringz(s), &endptr);
+return result;
+}
+/**********************************
+* Compare two strings. cmp is case sensitive, icmp is case insensitive.
+* Returns:
+*	<table border=1 cellpadding=4 cellspacing=0>
+*	$(TR $(TD < 0)	$(TD s1 < s2))
+*	$(TR $(TD = 0)	$(TD s1 == s2))
+*	$(TR $(TD > 0)	$(TD s1 > s2))
+*	</table>
+*/
+int cmp(char[] s1, char[] s2)
+{
+auto len = s1.length;
+int result;
+//printf("cmp('%.*s', '%.*s')\n", s1, s2);
+if (s2.length < len)
+	len = s2.length;
+result = memcmp(s1.ptr, s2.ptr, len);
+if (result == 0)
+	result = cast(int)s1.length - cast(int)s2.length;
+return result;
+}
+/*********************************
+* ditto
+*/
+int icmp(char[] s1, char[] s2)
+{
+auto len = s1.length;
+int result;
+if (s2.length < len)
+	len = s2.length;
+version (Win32)
+{
+	result = memicmp(s1.ptr, s2.ptr, len);
+}
+version (linux)
+{
+	for (size_t i = 0; i < len; i++)
+	{
+	    if (s1[i] != s2[i])
+	    {
+		char c1 = s1[i];
+		char c2 = s2[i];
+		if (c1 >= 'A' && c1 <= 'Z')
+		    c1 += cast(int)'a' - cast(int)'A';
+		if (c2 >= 'A' && c2 <= 'Z')
+		    c2 += cast(int)'a' - cast(int)'A';
+		result = cast(int)c1 - cast(int)c2;
+		if (result)
+		    break;
+	    }
+	}
+}
+if (result == 0)
+	result = cast(int)s1.length - cast(int)s2.length;
+return result;
+}
+unittest
+{
+int result;
+debug(string) printf("string.cmp.unittest\n");
+result = icmp("abc", "abc");
+assert(result == 0);
+result = icmp(null, null);
+assert(result == 0);
+result = icmp("", "");
+assert(result == 0);
+result = icmp("abc", "abcd");
+assert(result < 0);
+result = icmp("abcd", "abc");
+assert(result > 0);
+result = icmp("abc", "abd");
+assert(result < 0);
+result = icmp("bbc", "abc");
+assert(result > 0);
+}
+/* ********************************
+* Converts a D array of chars to a C-style 0 terminated string.
+* Deprecated: replaced with toStringz().
+*/
+deprecated char* toCharz(char[] s)
+{
+return toStringz(s);
+}
+/*********************************
+* Convert array of chars s[] to a C-style 0 terminated string.
+*/
+char* toStringz(char[] s)
+in
+{
+}
+out (result)
+{
+	if (result)
+	{   assert(strlen(result) == s.length);
+	    assert(memcmp(result, s.ptr, s.length) == 0);
+	}
+}
+body
+{
+	char[] copy;
+	if (s.length == 0)
+	    return "";
+	/+ Unfortunately, this isn't reliable.
+	   We could make this work if string literals are put
+	   in read-only memory and we test if s[] is pointing into
+	   that.
+	    /* Peek past end of s[], if it's 0, no conversion necessary.
+	     * Note that the compiler will put a 0 past the end of static
+	     * strings, and the storage allocator will put a 0 past the end
+	     * of newly allocated char[]'s.
+	     */
+	    char* p = &s[0] + s.length;
+	    if (*p == 0)
+		return s;
+	+/
+	// Need to make a copy
+	copy = new char[s.length + 1];
+	copy[0..s.length] = s;
+	copy[s.length] = 0;
+	return copy.ptr;
+}
+unittest
+{
+debug(string) printf("string.toStringz.unittest\n");
+char* p = toStringz("foo");
+assert(strlen(p) == 3);
+char foo[] = "abbzxyzzy";
+p = toStringz(foo[3..5]);
+assert(strlen(p) == 2);
+char[] test = "";
+p = toStringz(test);
+assert(*p == 0);
+}
+/******************************************
+* find, ifind _find first occurrence of c in string s.
+* rfind, irfind _find last occurrence of c in string s.
+*
+* find, rfind are case sensitive; ifind, irfind are case insensitive.
+* Returns:
+*	Index in s where c is found, -1 if not found.
+*/
+int find(char[] s, dchar c)
+{
+if (c <= 0x7F)
+{	// Plain old ASCII
+	auto p = cast(char*)memchr(s.ptr, c, s.length);
+	if (p)
+	    return p - cast(char *)s;
+	else
+	    return -1;
+}
+// c is a universal character
+foreach (int i, dchar c2; s)
+{
+	if (c == c2)
+	    return i;
+}
+return -1;
+}
+unittest
+{
+debug(string) printf("string.find.unittest\n");
+int i;
+i = find(null, cast(dchar)'a');
+assert(i == -1);
+i = find("def", cast(dchar)'a');
+assert(i == -1);
+i = find("abba", cast(dchar)'a');
+assert(i == 0);
+i = find("def", cast(dchar)'f');
+assert(i == 2);
+}
+/******************************************
+* ditto
+*/
+int ifind(char[] s, dchar c)
+{
+char* p;
+if (c <= 0x7F)
+{	// Plain old ASCII
+	char c1 = cast(char) std.ctype.tolower(c);
+	foreach (int i, char c2; s)
+	{
+	    c2 = cast(char)std.ctype.tolower(c2);
+	    if (c1 == c2)
+		return i;
+	}
+}
+else
+{	// c is a universal character
+	dchar c1 = std.uni.toUniLower(c);
+	foreach (int i, dchar c2; s)
+	{
+	    c2 = std.uni.toUniLower(c2);
+	    if (c1 == c2)
+		return i;
+	}
+}
+return -1;
+}
+unittest
+{
+debug(string) printf("string.ifind.unittest\n");
+int i;
+i = ifind(null, cast(dchar)'a');
+assert(i == -1);
+i = ifind("def", cast(dchar)'a');
+assert(i == -1);
+i = ifind("Abba", cast(dchar)'a');
+assert(i == 0);
+i = ifind("def", cast(dchar)'F');
+assert(i == 2);
+char[] sPlts = "Mars: the fourth Rock (Planet) from the Sun.";
+i = ifind("def", cast(char)'f');
+assert(i == 2);
+i = ifind(sPlts, cast(char)'P');
+assert(i == 23);
+i = ifind(sPlts, cast(char)'R');
+assert(i == 2);
+}
+/******************************************
+* ditto
+*/
+int rfind(char[] s, dchar c)
+{
+size_t i;
+if (c <= 0x7F)
+{	// Plain old ASCII
+	for (i = s.length; i-- != 0;)
+	{
+	    if (s[i] == c)
+		break;
+	}
+	return i;
+}
+// c is a universal character
+char[4] buf;
+char[] t;
+t = std.utf.toUTF8(buf, c);
+return rfind(s, t);
+}
+unittest
+{
+debug(string) printf("string.rfind.unittest\n");
+int i;
+i = rfind(null, cast(dchar)'a');
+assert(i == -1);
+i = rfind("def", cast(dchar)'a');
+assert(i == -1);
+i = rfind("abba", cast(dchar)'a');
+assert(i == 3);
+i = rfind("def", cast(dchar)'f');
+assert(i == 2);
+}
+/******************************************
+* ditto
+*/
+int irfind(char[] s, dchar c)
+{
+size_t i;
+if (c <= 0x7F)
+{	// Plain old ASCII
+	char c1 = cast(char) std.ctype.tolower(c);
+	for (i = s.length; i-- != 0;)
+	{   char c2 = s[i];
+	    c2 = cast(char) std.ctype.tolower(c2);
+	    if (c1 == c2)
+		break;
+	}
+}
+else
+{	// c is a universal character
+	dchar c1 = std.uni.toUniLower(c);
+	for (i = s.length; i-- != 0;)
+	{   char cx = s[i];
+	    if (cx <= 0x7F)
+		continue;		// skip, since c is not ASCII
+	    if ((cx & 0xC0) == 0x80)
+		continue;		// skip non-starting UTF-8 chars
+	    size_t j = i;
+	    dchar c2 = std.utf.decode(s, j);
+	    c2 = std.uni.toUniLower(c2);
+	    if (c1 == c2)
+		break;
+	}
+}
+return i;
+}
+unittest
+{
+debug(string) printf("string.irfind.unittest\n");
+int i;
+i = irfind(null, cast(dchar)'a');
+assert(i == -1);
+i = irfind("def", cast(dchar)'a');
+assert(i == -1);
+i = irfind("AbbA", cast(dchar)'a');
+assert(i == 3);
+i = irfind("def", cast(dchar)'F');
+assert(i == 2);
+char[] sPlts = "Mars: the fourth Rock (Planet) from the Sun.";
+i = irfind("def", cast(char)'f');
+assert(i == 2);
+i = irfind(sPlts, cast(char)'M');
+assert(i == 34);
+i = irfind(sPlts, cast(char)'S');
+assert(i == 40);
+}
+/******************************************
+* find, ifind _find first occurrence of sub[] in string s[].
+* rfind, irfind _find last occurrence of sub[] in string s[].
+*
+* find, rfind are case sensitive; ifind, irfind are case insensitive.
+* Returns:
+*	Index in s where c is found, -1 if not found.
+*/
+int find(char[] s, char[] sub)
+out (result)
+{
+	if (result == -1)
+	{
+	}
+	else
+	{
+	    assert(0 <= result && result < s.length - sub.length + 1);
+	    assert(memcmp(&s[result], sub.ptr, sub.length) == 0);
+	}
+}
+body
+{
+	auto sublength = sub.length;
+	if (sublength == 0)
+	    return 0;
+	if (s.length >= sublength)
+	{
+	    auto c = sub[0];
+	    if (sublength == 1)
+	    {
+		auto p = cast(char*)memchr(s.ptr, c, s.length);
+		if (p)
+		    return p - &s[0];
+	    }
+	    else
+	    {
+		size_t imax = s.length - sublength + 1;
+		// Remainder of sub[]
+		char *q = &sub[1];
+		sublength--;
+		for (size_t i = 0; i < imax; i++)
+		{
+		    char *p = cast(char*)memchr(&s[i], c, imax - i);
+		    if (!p)
+			break;
+		    i = p - &s[0];
+		    if (memcmp(p + 1, q, sublength) == 0)
+			return i;
+		}
+	    }
+	}
+	return -1;
+}
+unittest
+{
+debug(string) printf("string.find.unittest\n");
+int i;
+i = find(null, "a");
+assert(i == -1);
+i = find("def", "a");
+assert(i == -1);
+i = find("abba", "a");
+assert(i == 0);
+i = find("def", "f");
+assert(i == 2);
+i = find("dfefffg", "fff");
+assert(i == 3);
+i = find("dfeffgfff", "fff");
+assert(i == 6);
+}
+/******************************************
+* ditto
+*/
+int ifind(char[] s, char[] sub)
+out (result)
+{
+	if (result == -1)
+	{
+	}
+	else
+	{
+	    assert(0 <= result && result < s.length - sub.length + 1);
+	    assert(icmp(s[result .. result + sub.length], sub) == 0);
+	}
+}
+body
+{
+	auto sublength = sub.length;
+	int i;
+	if (sublength == 0)
+	    return 0;
+	if (s.length < sublength)
+	    return -1;
+	auto c = sub[0];
+	if (sublength == 1)
+	{
+	    i = ifind(s, c);
+	}
+	else if (c <= 0x7F)
+	{
+	    size_t imax = s.length - sublength + 1;
+	    // Remainder of sub[]
+	    char[] subn = sub[1 .. sublength];
+	    for (i = 0; i < imax; i++)
+	    {
+		auto j = ifind(s[i .. imax], c);
+		if (j == -1)
+		    return -1;
+		i += j;
+		if (icmp(s[i + 1 .. i + sublength], subn) == 0)
+		    return i;
+	    }
+	    i = -1;
+	}
+	else
+	{
+	    size_t imax = s.length - sublength;
+	    for (i = 0; i <= imax; i++)
+	    {
+		if (icmp(s[i .. i + sublength], sub) == 0)
+		    return i;
+	    }
+	    i = -1;
+	}
+	return i;
+}
+unittest
+{
+debug(string) printf("string.ifind.unittest\n");
+int i;
+i = ifind(null, "a");
+assert(i == -1);
+i = ifind("def", "a");
+assert(i == -1);
+i = ifind("abba", "a");
+assert(i == 0);
+i = ifind("def", "f");
+assert(i == 2);
+i = ifind("dfefffg", "fff");
+assert(i == 3);
+i = ifind("dfeffgfff", "fff");
+assert(i == 6);
+char[] sPlts = "Mars: the fourth Rock (Planet) from the Sun.";
+char[] sMars = "Who\'s \'My Favorite Maritian?\'";
+i = ifind(sMars, "MY fAVe");
+assert(i == -1);
+i = ifind(sMars, "mY fAVOriTe");
+assert(i == 7);
+i = ifind(sPlts, "mArS:");
+assert(i == 0);
+i = ifind(sPlts, "rOcK");
+assert(i == 17);
+i = ifind(sPlts, "Un.");
+assert(i == 41);
+i = ifind(sPlts, sPlts);
+assert(i == 0);
+i = ifind("\u0100", "\u0100");
+assert(i == 0);
+// Thanks to Carlos Santander B. and zwang
+i = ifind("sus mejores cortesanos. Se embarcaron en el puerto de Dubai y",
+	"page-break-before");
+assert(i == -1);
+}
+/******************************************
+* ditto
+*/
+int rfind(char[] s, char[] sub)
+out (result)
+{
+	if (result == -1)
+	{
+	}
+	else
+	{
+	    assert(0 <= result && result < s.length - sub.length + 1);
+	    assert(memcmp(&s[0] + result, sub.ptr, sub.length) == 0);
+	}
+}
+body
+{
+	char c;
+	if (sub.length == 0)
+	    return s.length;
+	c = sub[0];
+	if (sub.length == 1)
+	    return rfind(s, c);
+	for (int i = s.length - sub.length; i >= 0; i--)
+	{
+	    if (s[i] == c)
+	    {
+		if (memcmp(&s[i + 1], &sub[1], sub.length - 1) == 0)
+		    return i;
+	    }
+	}
+	return -1;
+}
+unittest
+{
+int i;
+debug(string) printf("string.rfind.unittest\n");
+i = rfind("abcdefcdef", "c");
+assert(i == 6);
+i = rfind("abcdefcdef", "cd");
+assert(i == 6);
+i = rfind("abcdefcdef", "x");
+assert(i == -1);
+i = rfind("abcdefcdef", "xy");
+assert(i == -1);
+i = rfind("abcdefcdef", "");
+assert(i == 10);
+}
+/******************************************
+* ditto
+*/
+int irfind(char[] s, char[] sub)
+out (result)
+{
+	if (result == -1)
+	{
+	}
+	else
+	{
+	    assert(0 <= result && result < s.length - sub.length + 1);
+	    assert(icmp(s[result .. result + sub.length], sub) == 0);
+	}
+}
+body
+{
+	dchar c;
+	if (sub.length == 0)
+	    return s.length;
+	c = sub[0];
+	if (sub.length == 1)
+	    return irfind(s, c);
+	if (c <= 0x7F)
+	{
+	    c = std.ctype.tolower(c);
+	    for (int i = s.length - sub.length; i >= 0; i--)
+	    {
+		if (std.ctype.tolower(s[i]) == c)
+		{
+		    if (icmp(s[i + 1 .. i + sub.length], sub[1 .. sub.length]) == 0)
+			return i;
+		}
+	    }
+	}
+	else
+	{
+	    for (int i = s.length - sub.length; i >= 0; i--)
+	    {
+		if (icmp(s[i .. i + sub.length], sub) == 0)
+		    return i;
+	    }
+	}
+	return -1;
+}
+unittest
+{
+int i;
+debug(string) printf("string.irfind.unittest\n");
+i = irfind("abcdefCdef", "c");
+assert(i == 6);
+i = irfind("abcdefCdef", "cD");
+assert(i == 6);
+i = irfind("abcdefcdef", "x");
+assert(i == -1);
+i = irfind("abcdefcdef", "xy");
+assert(i == -1);
+i = irfind("abcdefcdef", "");
+assert(i == 10);
+char[] sPlts = "Mars: the fourth Rock (Planet) from the Sun.";
+char[] sMars = "Who\'s \'My Favorite Maritian?\'";
+i = irfind("abcdefcdef", "c");
+assert(i == 6);
+i = irfind("abcdefcdef", "cd");
+assert(i == 6);
+i = irfind( "abcdefcdef", "def" );
+assert(i == 7);
+i = irfind(sMars, "RiTE maR");
+assert(i == 14);
+i = irfind(sPlts, "FOuRTh");
+assert(i == 10);
+i = irfind(sMars, "whO\'s \'MY");
+assert(i == 0);
+i = irfind(sMars, sMars);
+assert(i == 0);
+}
+/************************************
+* Convert string s[] to lower case.
+*/
+string tolower(string s)
+{
+int changed;
+char[] r;
+for (size_t i = 0; i < s.length; i++)
+{
+	auto c = s[i];
+	if ('A' <= c && c <= 'Z')
+	{
+	    if (!changed)
+	    {
+		r = s.dup;
+		changed = 1;
+	    }
+	    r[i] = cast(char) (c + (cast(char)'a' - 'A'));
+	}
+	else if (c > 0x7F)
+	{
+	    foreach (size_t j, dchar dc; s[i .. length])
+	    {
+		if (std.uni.isUniUpper(dc))
+		{
+		    dc = std.uni.toUniLower(dc);
+		    if (!changed)
+		    {
+			r = s[0 .. i + j].dup;
+			changed = 2;
+		    }
+		}
+		if (changed)
+		{
+		    if (changed == 1)
+		    {	r = r[0 .. i + j];
+			changed = 2;
+		    }
+		    std.utf.encode(r, dc);
+		}
+	    }
+	    break;
+	}
+}
+return changed ? r : s;
+}
+unittest
+{
+debug(string) printf("string.tolower.unittest\n");
+char[] s1 = "FoL";
+char[] s2;
+s2 = tolower(s1);
+assert(cmp(s2, "fol") == 0);
+assert(s2 != s1);
+s1 = "A\u0100B\u0101d";
+s2 = tolower(s1);
+assert(cmp(s2, "a\u0101b\u0101d") == 0);
+assert(s2 !is s1);
+s1 = "A\u0460B\u0461d";
+s2 = tolower(s1);
+assert(cmp(s2, "a\u0461b\u0461d") == 0);
+assert(s2 !is s1);
+s1 = "\u0130";
+s2 = tolower(s1);
+assert(s2 == "i");
+assert(s2 !is s1);
+}
+/************************************
+* Convert string s[] to upper case.
+*/
+string toupper(string s)
+{
+int changed;
+char[] r;
+for (size_t i = 0; i < s.length; i++)
+{
+	auto c = s[i];
+	if ('a' <= c && c <= 'z')
+	{
+	    if (!changed)
+	    {
+		r = s.dup;
+		changed = 1;
+	    }
+	    r[i] = cast(char) (c - (cast(char)'a' - 'A'));
+	}
+	else if (c > 0x7F)
+	{
+	    foreach (size_t j, dchar dc; s[i .. length])
+	    {
+		if (std.uni.isUniLower(dc))
+		{
+		    dc = std.uni.toUniUpper(dc);
+		    if (!changed)
+		    {
+			r = s[0 .. i + j].dup;
+			changed = 2;
+		    }
+		}
+		if (changed)
+		{
+		    if (changed == 1)
+		    {	r = r[0 .. i + j];
+			changed = 2;
+		    }
+		    std.utf.encode(r, dc);
+		}
+	    }
+	    break;
+	}
+}
+return changed ? r : s;
+}
+unittest
+{
+debug(string) printf("string.toupper.unittest\n");
+char[] s1 = "FoL";
+char[] s2;
+s2 = toupper(s1);
+assert(cmp(s2, "FOL") == 0);
+assert(s2 !is s1);
+s1 = "a\u0100B\u0101d";
+s2 = toupper(s1);
+assert(cmp(s2, "A\u0100B\u0100D") == 0);
+assert(s2 !is s1);
+s1 = "a\u0460B\u0461d";
+s2 = toupper(s1);
+assert(cmp(s2, "A\u0460B\u0460D") == 0);
+assert(s2 !is s1);
+}
+/********************************************
+* Capitalize first character of string s[], convert rest of string s[]
+* to lower case.
+*/
+char[] capitalize(char[] s)
+{
+int changed;
+int i;
+char[] r = s;
+changed = 0;
+foreach (size_t i, dchar c; s)
+{	dchar c2;
+	if (i == 0)
+	{
+	    c2 = std.uni.toUniUpper(c);
+	    if (c != c2)
+	    {
+		changed = 1;
+		r = null;
+	    }
+	}
+	else
+	{
+	    c2 = std.uni.toUniLower(c);
+	    if (c != c2)
+	    {
+		if (!changed)
+		{   changed = 1;
+		    r = s[0 .. i].dup;
+		}
+	    }
+	}
+	if (changed)
+	    std.utf.encode(r, c2);
+}
+return r;
+}
+unittest
+{
+debug(string) printf("string.toupper.capitalize\n");
+char[] s1 = "FoL";
+char[] s2;
+s2 = capitalize(s1);
+assert(cmp(s2, "Fol") == 0);
+assert(s2 !is s1);
+s2 = capitalize(s1[0 .. 2]);
+assert(cmp(s2, "Fo") == 0);
+assert(s2.ptr == s1.ptr);
+s1 = "fOl";
+s2 = capitalize(s1);
+assert(cmp(s2, "Fol") == 0);
+assert(s2 !is s1);
+}
+/********************************************
+* Capitalize all words in string s[].
+* Remove leading and trailing whitespace.
+* Replace all sequences of whitespace with a single space.
+*/
+char[] capwords(char[] s)
+{
+char[] r;
+bool inword = false;
+size_t istart = 0;
+size_t i;
+for (i = 0; i < s.length; i++)
+{
+	switch (s[i])
+	{
+	    case ' ':
+	    case '\t':
+	    case '\f':
+	    case '\r':
+	    case '\n':
+	    case '\v':
+		if (inword)
+		{
+		    r ~= capitalize(s[istart .. i]);
+		    inword = false;
+		}
+		break;
+	    default:
+		if (!inword)
+		{
+		    if (r.length)
+			r ~= ' ';
+		    istart = i;
+		    inword = true;
+		}
+		break;
+	}
+}
+if (inword)
+{
+	r ~= capitalize(s[istart .. i]);
+}
+return r;
+}
+unittest
+{
+debug(string) printf("string.capwords.unittest\n");
+char[] s1 = "\tfoo abc(aD)*  \t  (q PTT  ";
+char[] s2;
+s2 = capwords(s1);
+//writefln("s2 = '%s'", s2);
+assert(cmp(s2, "Foo Abc(ad)* (q Ptt") == 0);
+}
+/********************************************
+* Return a string that consists of s[] repeated n times.
+*/
+char[] repeat(char[] s, size_t n)
+{
+if (n == 0)
+	return null;
+if (n == 1)
+	return s;
+char[] r = new char[n * s.length];
+if (s.length == 1)
+	r[] = s[0];
+else
+{	auto len = s.length;
+	for (size_t i = 0; i < n * len; i += len)
+	{
+	    r[i .. i + len] = s[];
+	}
+}
+return r;
+}
+unittest
+{
+debug(string) printf("string.repeat.unittest\n");
+char[] s;
+s = repeat("1234", 0);
+assert(s is null);
+s = repeat("1234", 1);
+assert(cmp(s, "1234") == 0);
+s = repeat("1234", 2);
+assert(cmp(s, "12341234") == 0);
+s = repeat("1", 4);
+assert(cmp(s, "1111") == 0);
+s = repeat(null, 4);
+assert(s is null);
+}
+/********************************************
+* Concatenate all the strings in words[] together into one
+* string; use sep[] as the separator.
+*/
+char[] join(char[][] words, char[] sep)
+{
+char[] result;
+if (words.length)
+{
+	size_t len = 0;
+	size_t i;
+	for (i = 0; i < words.length; i++)
+	    len += words[i].length;
+	auto seplen = sep.length;
+	len += (words.length - 1) * seplen;
+	result = new char[len];
+	size_t j;
+	i = 0;
+	while (true)
+	{
+	    uint wlen = words[i].length;
+	    result[j .. j + wlen] = words[i];
+	    j += wlen;
+	    i++;
+	    if (i >= words.length)
+		break;
+	    result[j .. j + seplen] = sep;
+	    j += seplen;
+	}
+	assert(j == len);
+}
+return result;
+}
+unittest
+{
+debug(string) printf("string.join.unittest\n");
+char[] word1 = "peter";
+char[] word2 = "paul";
+char[] word3 = "jerry";
+char[][3] words;
+char[] r;
+int i;
+words[0] = word1;
+words[1] = word2;
+words[2] = word3;
+r = join(words, ",");
+i = cmp(r, "peter,paul,jerry");
+assert(i == 0);
+}
+/**************************************
+* Split s[] into an array of words,
+* using whitespace as the delimiter.
+*/
+char[][] split(char[] s)
+{
+size_t i;
+size_t istart = 0;
+bool inword = false;
+char[][] words;
+for (i = 0; i < s.length; i++)
+{
+	switch (s[i])
+	{
+	    case ' ':
+	    case '\t':
+	    case '\f':
+	    case '\r':
+	    case '\n':
+	    case '\v':
+		if (inword)
+		{
+		    words ~= s[istart .. i];
+		    inword = false;
+		}
+		break;
+	    default:
+		if (!inword)
+		{   istart = i;
+		    inword = true;
+		}
+		break;
+	}
+}
+if (inword)
+	words ~= s[istart .. i];
+return words;
+}
+unittest
+{
+debug(string) printf("string.split1\n");
+char[] s = " peter paul\tjerry ";
+char[][] words;
+int i;
+words = split(s);
+assert(words.length == 3);
+i = cmp(words[0], "peter");
+assert(i == 0);
+i = cmp(words[1], "paul");
+assert(i == 0);
+i = cmp(words[2], "jerry");
+assert(i == 0);
+}
+/**************************************
+* Split s[] into an array of words,
+* using delim[] as the delimiter.
+*/
+char[][] split(char[] s, char[] delim)
+in
+{
+	assert(delim.length > 0);
+}
+body
+{
+	size_t i;
+	size_t j;
+	char[][] words;
+	i = 0;
+	if (s.length)
+	{
+	    if (delim.length == 1)
+	    {	char c = delim[0];
+		size_t nwords = 0;
+		char* p = &s[0];
+		char* pend = p + s.length;
+		while (true)
+		{
+		    nwords++;
+		    p = cast(char*)memchr(p, c, pend - p);
+		    if (!p)
+			break;
+		    p++;
+		    if (p == pend)
+		    {	nwords++;
+			break;
+		    }
+		}
+		words.length = nwords;
+		int wordi = 0;
+		i = 0;
+		while (true)
+		{
+		    p = cast(char*)memchr(&s[i], c, s.length - i);
+		    if (!p)
+		    {
+			words[wordi] = s[i .. s.length];
+			break;
+		    }
+		    j = p - &s[0];
+		    words[wordi] = s[i .. j];
+		    wordi++;
+		    i = j + 1;
+		    if (i == s.length)
+		    {
+			words[wordi] = "";
+			break;
+		    }
+		}
+		assert(wordi + 1 == nwords);
+	    }
+	    else
+	    {	size_t nwords = 0;
+		while (true)
+		{
+		    nwords++;
+		    j = find(s[i .. s.length], delim);
+		    if (j == -1)
+			break;
+		    i += j + delim.length;
+		    if (i == s.length)
+		    {	nwords++;
+			break;
+		    }
+		    assert(i < s.length);
+		}
+		words.length = nwords;
+		int wordi = 0;
+		i = 0;
+		while (true)
+		{
+		    j = find(s[i .. s.length], delim);
+		    if (j == -1)
+		    {
+			words[wordi] = s[i .. s.length];
+			break;
+		    }
+		    words[wordi] = s[i .. i + j];
+		    wordi++;
+		    i += j + delim.length;
+		    if (i == s.length)
+		    {
+			words[wordi] = "";
+			break;
+		    }
+		    assert(i < s.length);
+		}
+		assert(wordi + 1 == nwords);
+	    }
+	}
+	return words;
+}
+unittest
+{
+debug(string) printf("string.split2\n");
+char[] s = ",peter,paul,jerry,";
+char[][] words;
+int i;
+words = split(s, ",");
+assert(words.length == 5);
+i = cmp(words[0], "");
+assert(i == 0);
+i = cmp(words[1], "peter");
+assert(i == 0);
+i = cmp(words[2], "paul");
+assert(i == 0);
+i = cmp(words[3], "jerry");
+assert(i == 0);
+i = cmp(words[4], "");
+assert(i == 0);
+s = s[0 .. s.length - 1];	// lop off trailing ','
+words = split(s, ",");
+assert(words.length == 4);
+i = cmp(words[3], "jerry");
+assert(i == 0);
+s = s[1 .. s.length];	// lop off leading ','
+words = split(s, ",");
+assert(words.length == 3);
+i = cmp(words[0], "peter");
+assert(i == 0);
+char[] s2 = ",,peter,,paul,,jerry,,";
+words = split(s2, ",,");
+//printf("words.length = %d\n", words.length);
+assert(words.length == 5);
+i = cmp(words[0], "");
+assert(i == 0);
+i = cmp(words[1], "peter");
+assert(i == 0);
+i = cmp(words[2], "paul");
+assert(i == 0);
+i = cmp(words[3], "jerry");
+assert(i == 0);
+i = cmp(words[4], "");
+assert(i == 0);
+s2 = s2[0 .. s2.length - 2];	// lop off trailing ',,'
+words = split(s2, ",,");
+assert(words.length == 4);
+i = cmp(words[3], "jerry");
+assert(i == 0);
+s2 = s2[2 .. s2.length];	// lop off leading ',,'
+words = split(s2, ",,");
+assert(words.length == 3);
+i = cmp(words[0], "peter");
+assert(i == 0);
+}
+/**************************************
+* Split s[] into an array of lines,
+* using CR, LF, or CR-LF as the delimiter.
+* The delimiter is not included in the line.
+*/
+char[][] splitlines(char[] s)
+{
+uint i;
+uint istart;
+uint nlines;
+char[][] lines;
+nlines = 0;
+for (i = 0; i < s.length; i++)
+{	char c;
+	c = s[i];
+	if (c == '\r' || c == '\n')
+	{
+	    nlines++;
+	    istart = i + 1;
+	    if (c == '\r' && i + 1 < s.length && s[i + 1] == '\n')
+	    {
+		i++;
+		istart++;
+	    }
+	}
+}
+if (istart != i)
+	nlines++;
+lines = new char[][nlines];
+nlines = 0;
+istart = 0;
+for (i = 0; i < s.length; i++)
+{	char c;
+	c = s[i];
+	if (c == '\r' || c == '\n')
+	{
+	    lines[nlines] = s[istart .. i];
+	    nlines++;
+	    istart = i + 1;
+	    if (c == '\r' && i + 1 < s.length && s[i + 1] == '\n')
+	    {
+		i++;
+		istart++;
+	    }
+	}
+}
+if (istart != i)
+{	lines[nlines] = s[istart .. i];
+	nlines++;
+}
+assert(nlines == lines.length);
+return lines;
+}
+unittest
+{
+debug(string) printf("string.splitlines\n");
+char[] s = "\rpeter\n\rpaul\r\njerry\n";
+char[][] lines;
+int i;
+lines = splitlines(s);
+//printf("lines.length = %d\n", lines.length);
+assert(lines.length == 5);
+//printf("lines[0] = %llx, '%.*s'\n", lines[0], lines[0]);
+assert(lines[0].length == 0);
+i = cmp(lines[1], "peter");
+assert(i == 0);
+assert(lines[2].length == 0);
+i = cmp(lines[3], "paul");
+assert(i == 0);
+i = cmp(lines[4], "jerry");
+assert(i == 0);
+s = s[0 .. s.length - 1];	// lop off trailing \n
+lines = splitlines(s);
+//printf("lines.length = %d\n", lines.length);
+assert(lines.length == 5);
+i = cmp(lines[4], "jerry");
+assert(i == 0);
+}
+/*****************************************
+* Strips leading or trailing whitespace, or both.
+*/
+char[] stripl(char[] s)
+{
+uint i;
+for (i = 0; i < s.length; i++)
+{
+	if (!std.ctype.isspace(s[i]))
+	    break;
+}
+return s[i .. s.length];
+}
+char[] stripr(char[] s) /// ditto
+{
+uint i;
+for (i = s.length; i > 0; i--)
+{
+	if (!std.ctype.isspace(s[i - 1]))
+	    break;
+}
+return s[0 .. i];
+}
+char[] strip(char[] s) /// ditto
+{
+return stripr(stripl(s));
+}
+unittest
+{
+debug(string) printf("string.strip.unittest\n");
+char[] s;
+int i;
+s = strip("  foo\t ");
+i = cmp(s, "foo");
+assert(i == 0);
+}
+/*******************************************
+* Returns s[] sans trailing delimiter[], if any.
+* If delimiter[] is null, removes trailing CR, LF, or CRLF, if any.
+*/
+char[] chomp(char[] s, char[] delimiter = null)
+{
+if (delimiter is null)
+{   auto len = s.length;
+	if (len)
+	{   auto c = s[len - 1];
+	    if (c == '\r')			// if ends in CR
+		len--;
+	    else if (c == '\n')			// if ends in LF
+	    {
+		len--;
+		if (len && s[len - 1] == '\r')
+		    len--;			// remove CR-LF
+	    }
+	}
+	return s[0 .. len];
+}
+else if (s.length >= delimiter.length)
+{
+	if (s[length - delimiter.length .. length] == delimiter)
+	    return s[0 .. length - delimiter.length];
+}
+return s;
+}
+unittest
+{
+debug(string) printf("string.chomp.unittest\n");
+char[] s;
+s = chomp(null);
+assert(s is null);
+s = chomp("hello");
+assert(s == "hello");
+s = chomp("hello\n");
+assert(s == "hello");
+s = chomp("hello\r");
+assert(s == "hello");
+s = chomp("hello\r\n");
+assert(s == "hello");
+s = chomp("hello\n\r");
+assert(s == "hello\n");
+s = chomp("hello\n\n");
+assert(s == "hello\n");
+s = chomp("hello\r\r");
+assert(s == "hello\r");
+s = chomp("hello\nxxx\n");
+assert(s == "hello\nxxx");
+s = chomp(null, null);
+assert(s is null);
+s = chomp("hello", "o");
+assert(s == "hell");
+s = chomp("hello", "p");
+assert(s == "hello");
+s = chomp("hello", null);
+assert(s == "hello");
+s = chomp("hello", "llo");
+assert(s == "he");
+}
+/***********************************************
+* Returns s[] sans trailing character, if there is one.
+* If last two characters are CR-LF, then both are removed.
+*/
+char[] chop(char[] s)
+{   auto len = s.length;
+if (len)
+{
+	if (len >= 2 && s[len - 1] == '\n' && s[len - 2] == '\r')
+	    return s[0 .. len - 2];
+	// If we're in a tail of a UTF-8 sequence, back up
+	while ((s[len - 1] & 0xC0) == 0x80)
+	{
+	    len--;
+	    if (len == 0)
+		throw new std.utf.UtfException("invalid UTF sequence", 0);
+	}
+	return s[0 .. len - 1];
+}
+return s;
+}
+unittest
+{
+debug(string) printf("string.chop.unittest\n");
+char[] s;
+s = chop(null);
+assert(s is null);
+s = chop("hello");
+assert(s == "hell");
+s = chop("hello\r\n");
+assert(s == "hello");
+s = chop("hello\n\r");
+assert(s == "hello\n");
+}
+/*******************************************
+* Left justify, right justify, or center string s[]
+* in field width chars wide.
+*/
+char[] ljustify(char[] s, int width)
+{
+if (s.length >= width)
+	return s;
+char[] r = new char[width];
+r[0..s.length] = s;
+r[s.length .. width] = cast(char)' ';
+return r;
+}
+/// ditto
+char[] rjustify(char[] s, int width)
+{
+if (s.length >= width)
+	return s;
+char[] r = new char[width];
+r[0 .. width - s.length] = cast(char)' ';
+r[width - s.length .. width] = s;
+return r;
+}
+/// ditto
+char[] center(char[] s, int width)
+{
+if (s.length >= width)
+	return s;
+char[] r = new char[width];
+int left = (width - s.length) / 2;
+r[0 .. left] = cast(char)' ';
+r[left .. left + s.length] = s;
+r[left + s.length .. width] = cast(char)' ';
+return r;
+}
+unittest
+{
+debug(string) printf("string.justify.unittest\n");
+char[] s = "hello";
+char[] r;
+int i;
+r = ljustify(s, 8);
+i = cmp(r, "hello   ");
+assert(i == 0);
+r = rjustify(s, 8);
+i = cmp(r, "   hello");
+assert(i == 0);
+r = center(s, 8);
+i = cmp(r, " hello  ");
+assert(i == 0);
+r = zfill(s, 8);
+i = cmp(r, "000hello");
+assert(i == 0);
+}
+/*****************************************
+* Same as rjustify(), but fill with '0's.
+*/
+char[] zfill(char[] s, int width)
+{
+if (s.length >= width)
+	return s;
+char[] r = new char[width];
+r[0 .. width - s.length] = cast(char)'0';
+r[width - s.length .. width] = s;
+return r;
+}
+/********************************************
+* Replace occurrences of from[] with to[] in s[].
+*/
+char[] replace(char[] s, char[] from, char[] to)
+{
+char[] p;
+int i;
+size_t istart;
+//printf("replace('%.*s','%.*s','%.*s')\n", s, from, to);
+if (from.length == 0)
+	return s;
+istart = 0;
+while (istart < s.length)
+{
+	i = find(s[istart .. s.length], from);
+	if (i == -1)
+	{
+	    p ~= s[istart .. s.length];
+	    break;
+	}
+	p ~= s[istart .. istart + i];
+	p ~= to;
+	istart += i + from.length;
+}
+return p;
+}
+unittest
+{
+debug(string) printf("string.replace.unittest\n");
+char[] s = "This is a foo foo list";
+char[] from = "foo";
+char[] to = "silly";
+char[] r;
+int i;
+r = replace(s, from, to);
+i = cmp(r, "This is a silly silly list");
+assert(i == 0);
+r = replace(s, "", to);
+i = cmp(r, "This is a foo foo list");
+assert(i == 0);
+}
+/*****************************
+* Return a _string that is string[] with slice[] replaced by replacement[].
+*/
+char[] replaceSlice(char[] string, char[] slice, char[] replacement)
+in
+{
+// Verify that slice[] really is a slice of string[]
+int so = cast(char*)slice - cast(char*)string;
+assert(so >= 0);
+//printf("string.length = %d, so = %d, slice.length = %d\n", string.length, so, slice.length);
+assert(string.length >= so + slice.length);
+}
+body
+{
+char[] result;
+int so = cast(char*)slice - cast(char*)string;
+result.length = string.length - slice.length + replacement.length;
+result[0 .. so] = string[0 .. so];
+result[so .. so + replacement.length] = replacement;
+result[so + replacement.length .. result.length] = string[so + slice.length .. string.length];
+return result;
+}
+unittest
+{
+debug(string) printf("string.replaceSlice.unittest\n");
+char[] string = "hello";
+char[] slice = string[2 .. 4];
+char[] r = replaceSlice(string, slice, "bar");
+int i;
+i = cmp(r, "hebaro");
+assert(i == 0);
+}
+/**********************************************
+* Insert sub[] into s[] at location index.
+*/
+char[] insert(char[] s, size_t index, char[] sub)
+in
+{
+assert(0 <= index && index <= s.length);
+}
+body
+{
+if (sub.length == 0)
+	return s;
+if (s.length == 0)
+	return sub;
+int newlength = s.length + sub.length;
+char[] result = new char[newlength];
+result[0 .. index] = s[0 .. index];
+result[index .. index + sub.length] = sub;
+result[index + sub.length .. newlength] = s[index .. s.length];
+return result;
+}
+unittest
+{
+debug(string) printf("string.insert.unittest\n");
+char[] r;
+int i;
+r = insert("abcd", 0, "e");
+i = cmp(r, "eabcd");
+assert(i == 0);
+r = insert("abcd", 4, "e");
+i = cmp(r, "abcde");
+assert(i == 0);
+r = insert("abcd", 2, "ef");
+i = cmp(r, "abefcd");
+assert(i == 0);
+r = insert(null, 0, "e");
+i = cmp(r, "e");
+assert(i == 0);
+r = insert("abcd", 0, null);
+i = cmp(r, "abcd");
+assert(i == 0);
+}
+/***********************************************
+* Count up all instances of sub[] in s[].
+*/
+size_t count(char[] s, char[] sub)
+{
+size_t i;
+int j;
+int count = 0;
+for (i = 0; i < s.length; i += j + sub.length)
+{
+	j = find(s[i .. s.length], sub);
+	if (j == -1)
+	    break;
+	count++;
+}
+return count;
+}
+unittest
+{
+debug(string) printf("string.count.unittest\n");
+char[] s = "This is a fofofof list";
+char[] sub = "fof";
+int i;
+i = count(s, sub);
+assert(i == 2);
+}
+/************************************************
+* Replace tabs with the appropriate number of spaces.
+* tabsize is the distance between tab stops.
+*/
+char[] expandtabs(char[] string, int tabsize = 8)
+{
+bool changes = false;
+char[] result = string;
+int column;
+int nspaces;
+foreach (size_t i, dchar c; string)
+{
+	switch (c)
+	{
+	    case '\t':
+		nspaces = tabsize - (column % tabsize);
+		if (!changes)
+		{
+		    changes = true;
+		    result = null;
+		    result.length = string.length + nspaces - 1;
+		    result.length = i + nspaces;
+		    result[0 .. i] = string[0 .. i];
+		    result[i .. i + nspaces] = ' ';
+		}
+		else
+		{   int j = result.length;
+		    result.length = j + nspaces;
+		    result[j .. j + nspaces] = ' ';
+		}
+		column += nspaces;
+		break;
+	    case '\r':
+	    case '\n':
+	    case PS:
+	    case LS:
+		column = 0;
+		goto L1;
+	    default:
+		column++;
+	    L1:
+		if (changes)
+		{
+		    if (c <= 0x7F)
+			result ~= cast(char)c;
+		    else
+			std.utf.encode(result, c);
+		}
+		break;
+	}
+}
+return result;
+}
+unittest
+{
+debug(string) printf("string.expandtabs.unittest\n");
+char[] s = "This \tis\t a fofof\tof list";
+char[] r;
+int i;
+r = expandtabs(s, 8);
+i = cmp(r, "This    is       a fofof        of list");
+assert(i == 0);
+r = expandtabs(null);
+assert(r == null);
+r = expandtabs("");
+assert(r.length == 0);
+r = expandtabs("a");
+assert(r == "a");
+r = expandtabs("\t");
+assert(r == "        ");
+r = expandtabs(  "  ab\tasdf ");
+//writefln("r = '%s'", r);
+assert(r == "  ab    asdf ");
+// TODO: need UTF test case
+}
+/*******************************************
+* Replace spaces in string with the optimal number of tabs.
+* Trailing spaces or tabs in a line are removed.
+* Params:
+*	string = String to convert.
+*	tabsize = Tab columns are tabsize spaces apart. tabsize defaults to 8.
+*/
+char[] entab(char[] string, int tabsize = 8)
+{
+bool changes = false;
+char[] result = string;
+int nspaces = 0;
+int nwhite = 0;
+int column = 0;			// column number
+foreach (size_t i, dchar c; string)
+{
+	void change()
+	{
+	    changes = true;
+	    result = null;
+	    result.length = string.length;
+	    result.length = i;
+	    result[0 .. i] = string[0 .. i];
+	}
+	switch (c)
+	{
+	    case '\t':
+		nwhite++;
+		if (nspaces)
+		{
+		    if (!changes)
+			change();
+		    int j = result.length - nspaces;
+		    int ntabs = (((column - nspaces) % tabsize) + nspaces) / tabsize;
+		    result.length = j + ntabs;
+		    result[j .. j + ntabs] = '\t';
+		    nwhite += ntabs - nspaces;
+		    nspaces = 0;
+		}
+		column = (column + tabsize) / tabsize * tabsize;
+		break;
+	    case '\r':
+	    case '\n':
+	    case PS:
+	    case LS:
+		// Truncate any trailing spaces or tabs
+		if (nwhite)
+		{
+		    if (!changes)
+			change();
+		    result = result[0 .. result.length - nwhite];
+		}
+		break;
+	    default:
+		if (nspaces >= 2 && (column % tabsize) == 0)
+		{
+		    if (!changes)
+			change();
+		    int j = result.length - nspaces;
+		    int ntabs = (nspaces + tabsize - 1) / tabsize;
+		    result.length = j + ntabs;
+		    result[j .. j + ntabs] = '\t';
+		    nwhite += ntabs - nspaces;
+		    nspaces = 0;
+		}
+		if (c == ' ')
+		{   nwhite++;
+		    nspaces++;
+		}
+		else
+		{   nwhite = 0;
+		    nspaces = 0;
+		}
+		column++;
+		break;
+	}
+	if (changes)
+	{
+	    if (c <= 0x7F)
+		result ~= cast(char)c;
+	    else
+		std.utf.encode(result, c);
+	}
+}
+// Truncate any trailing spaces or tabs
+if (nwhite)
+	result = result[0 .. result.length - nwhite];
+return result;
+}
+unittest
+{
+debug(string) printf("string.entab.unittest\n");
+char[] r;
+r = entab(null);
+assert(r == null);
+r = entab("");
+assert(r.length == 0);
+r = entab("a");
+assert(r == "a");
+r = entab("        ");
+assert(r == "");
+r = entab("        x");
+assert(r == "\tx");
+r = entab("  ab    asdf ");
+assert(r == "  ab\tasdf");
+r = entab("  ab     asdf ");
+assert(r == "  ab\t asdf");
+r = entab("  ab \t   asdf ");
+assert(r == "  ab\t   asdf");
+r = entab("1234567 \ta");
+assert(r == "1234567\t\ta");
+r = entab("1234567  \ta");
+assert(r == "1234567\t\ta");
+r = entab("1234567   \ta");
+assert(r == "1234567\t\ta");
+r = entab("1234567    \ta");
+assert(r == "1234567\t\ta");
+r = entab("1234567     \ta");
+assert(r == "1234567\t\ta");
+r = entab("1234567      \ta");
+assert(r == "1234567\t\ta");
+r = entab("1234567       \ta");
+assert(r == "1234567\t\ta");
+r = entab("1234567        \ta");
+assert(r == "1234567\t\ta");
+r = entab("1234567         \ta");
+assert(r == "1234567\t\t\ta");
+// TODO: need UTF test case
+}
+/************************************
+* Construct translation table for translate().
+* BUG: only works with ASCII
+*/
+char[] maketrans(char[] from, char[] to)
+in
+{
+	assert(from.length == to.length);
+	assert(from.length <= 128);
+	foreach (char c; from)
+	{
+	    assert(c <= 0x7F);
+	}
+	foreach (char c; to)
+	{
+	    assert(c <= 0x7F);
+	}
+}
+body
+{
+	char[] t = new char[256];
+	int i;
+	for (i = 0; i < t.length; i++)
+	    t[i] = cast(char)i;
+	for (i = 0; i < from.length; i++)
+	    t[from[i]] = to[i];
+	return t;
+}
+/******************************************
+* Translate characters in s[] using table created by maketrans().
+* Delete chars in delchars[].
+* BUG: only works with ASCII
+*/
+char[] translate(char[] s, char[] transtab, char[] delchars)
+in
+{
+	assert(transtab.length == 256);
+}
+body
+{
+	char[] r;
+	int count;
+	bool[256] deltab;
+	deltab[] = false;
+	foreach (char c; delchars)
+	{
+	    deltab[c] = true;
+	}
+	count = 0;
+	foreach (char c; s)
+	{
+	    if (!deltab[c])
+		count++;
+	    //printf("s[%d] = '%c', count = %d\n", i, s[i], count);
+	}
+	r = new char[count];
+	count = 0;
+	foreach (char c; s)
+	{
+	    if (!deltab[c])
+	    {
+		r[count] = transtab[c];
+		count++;
+	    }
+	}
+	return r;
+}
+unittest
+{
+debug(string) printf("string.translate.unittest\n");
+char[] from = "abcdef";
+char[] to   = "ABCDEF";
+char[] s    = "The quick dog fox";
+char[] t;
+char[] r;
+int i;
+t = maketrans(from, to);
+r = translate(s, t, "kg");
+//printf("r = '%.*s'\n", r);
+i = cmp(r, "ThE quiC Do Fox");
+assert(i == 0);
+}
+/***********************************************
+* Convert to char[].
+*/
+char[] toString(bool b)
+{
+return b ? "true" : "false";
+}
+/// ditto
+char[] toString(char c)
+{
+char[] result = new char[2];
+result[0] = c;
+result[1] = 0;
+return result[0 .. 1];
+}
+unittest
+{
+debug(string) printf("string.toString(char).unittest\n");
+char[] s = "foo";
+char[] s2;
+foreach (char c; s)
+{
+	s2 ~= std.string.toString(c);
+}
+//printf("%.*s", s2);
+assert(s2 == "foo");
+}
+char[] toString(ubyte ub)  { return toString(cast(uint) ub); } /// ditto
+char[] toString(ushort us) { return toString(cast(uint) us); } /// ditto
+/// ditto
+char[] toString(uint u)
+{   char[uint.sizeof * 3] buffer = void;
+int ndigits;
+char[] result;
+ndigits = 0;
+if (u < 10)
+	// Avoid storage allocation for simple stuff
+	result = digits[u .. u + 1];
+else
+{
+	while (u)
+	{
+	    uint c = (u % 10) + '0';
+	    u /= 10;
+	    ndigits++;
+	    buffer[buffer.length - ndigits] = cast(char)c;
+	}
+	result = new char[ndigits];
+	result[] = buffer[buffer.length - ndigits .. buffer.length];
+}
+return result;
+}
+unittest
+{
+debug(string) printf("string.toString(uint).unittest\n");
+char[] r;
+int i;
+r = toString(0u);
+i = cmp(r, "0");
+assert(i == 0);
+r = toString(9u);
+i = cmp(r, "9");
+assert(i == 0);
+r = toString(123u);
+i = cmp(r, "123");
+assert(i == 0);
+}
+/// ditto
+char[] toString(ulong u)
+{   char[ulong.sizeof * 3] buffer;
+int ndigits;
+char[] result;
+if (u < 0x1_0000_0000)
+	return toString(cast(uint)u);
+ndigits = 0;
+while (u)
+{
+	char c = cast(char)((u % 10) + '0');
+	u /= 10;
+	ndigits++;
+	buffer[buffer.length - ndigits] = c;
+}
+result = new char[ndigits];
+result[] = buffer[buffer.length - ndigits .. buffer.length];
+return result;
+}
+unittest
+{
+debug(string) printf("string.toString(ulong).unittest\n");
+char[] r;
+int i;
+r = toString(0uL);
+i = cmp(r, "0");
+assert(i == 0);
+r = toString(9uL);
+i = cmp(r, "9");
+assert(i == 0);
+r = toString(123uL);
+i = cmp(r, "123");
+assert(i == 0);
+}
+char[] toString(byte b)  { return toString(cast(int) b); } /// ditto
+char[] toString(short s) { return toString(cast(int) s); } /// ditto
+/// ditto
+char[] toString(int i)
+{   char[1 + int.sizeof * 3] buffer;
+char[] result;
+if (i >= 0)
+	return toString(cast(uint)i);
+uint u = -i;
+int ndigits = 1;
+while (u)
+{
+	char c = cast(char)((u % 10) + '0');
+	u /= 10;
+	buffer[buffer.length - ndigits] = c;
+	ndigits++;
+}
+buffer[buffer.length - ndigits] = '-';
+result = new char[ndigits];
+result[] = buffer[buffer.length - ndigits .. buffer.length];
+return result;
+}
+unittest
+{
+debug(string) printf("string.toString(int).unittest\n");
+char[] r;
+int i;
+r = toString(0);
+i = cmp(r, "0");
+assert(i == 0);
+r = toString(9);
+i = cmp(r, "9");
+assert(i == 0);
+r = toString(123);
+i = cmp(r, "123");
+assert(i == 0);
+r = toString(-0);
+i = cmp(r, "0");
+assert(i == 0);
+r = toString(-9);
+i = cmp(r, "-9");
+assert(i == 0);
+r = toString(-123);
+i = cmp(r, "-123");
+assert(i == 0);
+}
+/// ditto
+char[] toString(long i)
+{   char[1 + long.sizeof * 3] buffer;
+char[] result;
+if (i >= 0)
+	return toString(cast(ulong)i);
+if (cast(int)i == i)
+	return toString(cast(int)i);
+ulong u = cast(ulong)(-i);
+int ndigits = 1;
+while (u)
+{
+	char c = cast(char)((u % 10) + '0');
+	u /= 10;
+	buffer[buffer.length - ndigits] = c;
+	ndigits++;
+}
+buffer[buffer.length - ndigits] = '-';
+result = new char[ndigits];
+result[] = buffer[buffer.length - ndigits .. buffer.length];
+return result;
+}
+unittest
+{
+debug(string) printf("string.toString(long).unittest\n");
+char[] r;
+int i;
+r = toString(0L);
+i = cmp(r, "0");
+assert(i == 0);
+r = toString(9L);
+i = cmp(r, "9");
+assert(i == 0);
+r = toString(123L);
+i = cmp(r, "123");
+assert(i == 0);
+r = toString(-0L);
+i = cmp(r, "0");
+assert(i == 0);
+r = toString(-9L);
+i = cmp(r, "-9");
+assert(i == 0);
+r = toString(-123L);
+i = cmp(r, "-123");
+assert(i == 0);
+}
+/// ditto
+char[] toString(float f) { return toString(cast(double) f); }
+/// ditto
+char[] toString(double d)
+{
+char[20] buffer;
+int len = sprintf(buffer.ptr, "%g", d);
+return buffer[0 .. len].dup;
+}
+/// ditto
+char[] toString(real r)
+{
+char[20] buffer;
+int len = sprintf(buffer.ptr, "%Lg", r);
+return buffer[0 .. len].dup;
+}
+/// ditto
+char[] toString(ifloat f) { return toString(cast(idouble) f); }
+/// ditto
+char[] toString(idouble d)
+{
+char[21] buffer;
+int len = sprintf(buffer.ptr, "%gi", d);
+return buffer[0 .. len].dup;
+}
+/// ditto
+char[] toString(ireal r)
+{
+char[21] buffer;
+int len = sprintf(buffer.ptr, "%Lgi", r);
+return buffer[0 .. len].dup;
+}
+/// ditto
+char[] toString(cfloat f) { return toString(cast(cdouble) f); }
+/// ditto
+char[] toString(cdouble d)
+{
+char[20 + 1 + 20 + 1] buffer;
+int len = sprintf(buffer.ptr, "%g+%gi", d.re, d.im);
+return buffer[0 .. len].dup;
+}
+/// ditto
+char[] toString(creal r)
+{
+char[20 + 1 + 20 + 1] buffer;
+int len = sprintf(buffer.ptr, "%Lg+%Lgi", r.re, r.im);
+return buffer[0 .. len].dup;
+}
+/******************************************
+* Convert value to string in _radix radix.
+*
+* radix must be a value from 2 to 36.
+* value is treated as a signed value only if radix is 10.
+* The characters A through Z are used to represent values 10 through 36.
+*/
+char[] toString(long value, uint radix)
+in
+{
+assert(radix >= 2 && radix <= 36);
+}
+body
+{
+if (radix == 10)
+	return toString(value);		// handle signed cases only for radix 10
+return toString(cast(ulong)value, radix);
+}
+/// ditto
+char[] toString(ulong value, uint radix)
+in
+{
+assert(radix >= 2 && radix <= 36);
+}
+body
+{
+char[value.sizeof * 8] buffer;
+uint i = buffer.length;
+if (value < radix && value < hexdigits.length)
+	return hexdigits[cast(size_t)value .. cast(size_t)value + 1];
+do
+{	ubyte c;
+	c = cast(ubyte)(value % radix);
+	value = value / radix;
+	i--;
+	buffer[i] = cast(char)((c < 10) ? c + '0' : c + 'A' - 10);
+} while (value);
+return buffer[i .. length].dup;
+}
+unittest
+{
+debug(string) printf("string.toString(ulong, uint).unittest\n");
+char[] r;
+int i;
+r = toString(-10L, 10u);
+assert(r == "-10");
+r = toString(15L, 2u);
+//writefln("r = '%s'", r);
+assert(r == "1111");
+r = toString(1L, 2u);
+//writefln("r = '%s'", r);
+assert(r == "1");
+r = toString(0x1234AFL, 16u);
+//writefln("r = '%s'", r);
+assert(r == "1234AF");
+}
+/*************************************************
+* Convert C-style 0 terminated string s to char[] string.
+*/
+char[] toString(char *s)
+{
+return s ? s[0 .. strlen(s)] : cast(char[])null;
+}
+unittest
+{
+debug(string) printf("string.toString(char*).unittest\n");
+char[] r;
+int i;
+r = toString(null);
+i = cmp(r, "");
+assert(i == 0);
+r = toString("foo\0");
+i = cmp(r, "foo");
+assert(i == 0);
+}
+/*****************************************************
+* Format arguments into a string.
+*/
+char[] format(...)
+{
+char[] s;
+void putc(dchar c)
+{
+	std.utf.encode(s, c);
+}
+std.format.doFormat(&putc, _arguments, _argptr);
+return s;
+}
+/*****************************************************
+* Format arguments into string <i>s</i> which must be large
+* enough to hold the result. Throws ArrayBoundsError if it is not.
+* Returns: s
+*/
+char[] sformat(char[] s, ...)
+{   size_t i;
+void putc(dchar c)
+{
+	if (c <= 0x7F)
+	{
+	    if (i >= s.length)
+		throw new ArrayBoundsError("std.string.sformat", 0);
+	    s[i] = cast(char)c;
+	    ++i;
+	}
+	else
+	{   char[4] buf;
+	    char[] b;
+	    b = std.utf.toUTF8(buf, c);
+	    if (i + b.length > s.length)
+		throw new ArrayBoundsError("std.string.sformat", 0);
+	    s[i..i+b.length] = b[];
+	    i += b.length;
+	}
+}
+std.format.doFormat(&putc, _arguments, _argptr);
+return s[0 .. i];
+}
+unittest
+{
+debug(string) printf("std.string.format.unittest\n");
+char[] r;
+int i;
+/+
+r = format(null);
+i = cmp(r, "");
+assert(i == 0);
++/
+r = format("foo");
+i = cmp(r, "foo");
+assert(i == 0);
+r = format("foo%%");
+i = cmp(r, "foo%");
+assert(i == 0);
+r = format("foo%s", 'C');
+i = cmp(r, "fooC");
+assert(i == 0);
+r = format("%s foo", "bar");
+i = cmp(r, "bar foo");
+assert(i == 0);
+r = format("%s foo %s", "bar", "abc");
+i = cmp(r, "bar foo abc");
+assert(i == 0);
+r = format("foo %d", -123);
+i = cmp(r, "foo -123");
+assert(i == 0);
+r = format("foo %d", 123);
+i = cmp(r, "foo 123");
+assert(i == 0);
+}
+/***********************************************
+* See if character c is in the pattern.
+* Patterns:
+*
+*	A <i>pattern</i> is an array of characters much like a <i>character
+*	class</i> in regular expressions. A sequence of characters
+*	can be given, such as "abcde". The '-' can represent a range
+*	of characters, as "a-e" represents the same pattern as "abcde".
+*	"a-fA-F0-9" represents all the hex characters.
+*	If the first character of a pattern is '^', then the pattern
+*	is negated, i.e. "^0-9" means any character except a digit.
+*	The functions inPattern, <b>countchars</b>, <b>removeschars</b>,
+*	and <b>squeeze</b>
+*	use patterns.
+*
+* Note: In the future, the pattern syntax may be improved
+*	to be more like regular expression character classes.
+*/
+bool inPattern(dchar c, char[] pattern)
+{
+bool result = false;
+int range = 0;
+dchar lastc;
+foreach (size_t i, dchar p; pattern)
+{
+	if (p == '^' && i == 0)
+	{   result = true;
+	    if (i + 1 == pattern.length)
+		return (c == p);	// or should this be an error?
+	}
+	else if (range)
+	{
+	    range = 0;
+	    if (lastc <= c && c <= p || c == p)
+		return !result;
+	}
+	else if (p == '-' && i > result && i + 1 < pattern.length)
+	{
+	    range = 1;
+	    continue;
+	}
+	else if (c == p)
+	    return !result;
+	lastc = p;
+}
+return result;
+}
+unittest
+{
+debug(string) printf("std.string.inPattern.unittest\n");
+int i;
+i = inPattern('x', "x");
+assert(i == 1);
+i = inPattern('x', "y");
+assert(i == 0);
+i = inPattern('x', cast(char[])null);
+assert(i == 0);
+i = inPattern('x', "^y");
+assert(i == 1);
+i = inPattern('x', "yxxy");
+assert(i == 1);
+i = inPattern('x', "^yxxy");
+assert(i == 0);
+i = inPattern('x', "^abcd");
+assert(i == 1);
+i = inPattern('^', "^^");
+assert(i == 0);
+i = inPattern('^', "^");
+assert(i == 1);
+i = inPattern('^', "a^");
+assert(i == 1);
+i = inPattern('x', "a-z");
+assert(i == 1);
+i = inPattern('x', "A-Z");
+assert(i == 0);
+i = inPattern('x', "^a-z");
+assert(i == 0);
+i = inPattern('x', "^A-Z");
+assert(i == 1);
+i = inPattern('-', "a-");
+assert(i == 1);
+i = inPattern('-', "^A-");
+assert(i == 0);
+i = inPattern('a', "z-a");
+assert(i == 1);
+i = inPattern('z', "z-a");
+assert(i == 1);
+i = inPattern('x', "z-a");
+assert(i == 0);
+}
+/***********************************************
+* See if character c is in the intersection of the patterns.
+*/
+int inPattern(dchar c, char[][] patterns)
+{   int result;
+foreach (char[] pattern; patterns)
+{
+	if (!inPattern(c, pattern))
+	{   result = 0;
+	    break;
+	}
+	result = 1;
+}
+return result;
+}
+/********************************************
+* Count characters in s that match pattern.
+*/
+size_t countchars(char[] s, char[] pattern)
+{
+size_t count;
+foreach (dchar c; s)
+{
+	count += inPattern(c, pattern);
+}
+return count;
+}
+unittest
+{
+debug(string) printf("std.string.count.unittest\n");
+size_t c;
+c = countchars("abc", "a-c");
+assert(c == 3);
+c = countchars("hello world", "or");
+assert(c == 3);
+}
+/********************************************
+* Return string that is s with all characters removed that match pattern.
+*/
+char[] removechars(char[] s, char[] pattern)
+{
+char[] r = s;
+int changed;
+size_t j;
+foreach (size_t i, dchar c; s)
+{
+	if (!inPattern(c, pattern))
+	{
+	    if (changed)
+	    {
+		if (r is s)
+		    r = s[0 .. j].dup;
+		std.utf.encode(r, c);
+	    }
+	}
+	else if (!changed)
+	{   changed = 1;
+	    j = i;
+	}
+}
+if (changed && r is s)
+	r = s[0 .. j].dup;
+return r;
+}
+unittest
+{
+debug(string) printf("std.string.remove.unittest\n");
+char[] r;
+r = removechars("abc", "a-c");
+assert(r is null);
+r = removechars("hello world", "or");
+assert(r == "hell wld");
+r = removechars("hello world", "d");
+assert(r == "hello worl");
+}
+/***************************************************
+* Return string where sequences of a character in s[] from pattern[]
+* are replaced with a single instance of that character.
+* If pattern is null, it defaults to all characters.
+*/
+char[] squeeze(char[] s, char[] pattern = null)
+{
+char[] r = s;
+dchar lastc;
+size_t lasti;
+int run;
+bool changed;
+foreach (size_t i, dchar c; s)
+{
+	if (run && lastc == c)
+	{
+	    changed = true;
+	}
+	else if (pattern is null || inPattern(c, pattern))
+	{
+	    run = 1;
+	    if (changed)
+	    {	if (r is s)
+		    r = s[0 .. lasti].dup;
+		std.utf.encode(r, c);
+	    }
+	    else
+		lasti = i + std.utf.stride(s, i);
+	    lastc = c;
+	}
+	else
+	{
+	    run = 0;
+	    if (changed)
+	    {	if (r is s)
+		    r = s[0 .. lasti].dup;
+		std.utf.encode(r, c);
+	    }
+	}
+}
+if (changed)
+{
+	if (r is s)
+	    r = s[0 .. lasti];
+}
+return r;
+}
+unittest
+{
+debug(string) printf("std.string.squeeze.unittest\n");
+char[] s,r;
+r = squeeze("hello");
+//writefln("r = '%s'", r);
+assert(r == "helo");
+s = "abcd";
+r = squeeze(s);
+assert(r is s);
+s = "xyzz";
+r = squeeze(s);
+assert(r.ptr == s.ptr);	// should just be a slice
+r = squeeze("hello goodbyee", "oe");
+assert(r == "hello godbye");
+}
+/**********************************************
+* Return string that is the 'successor' to s[].
+* If the rightmost character is a-zA-Z0-9, it is incremented within
+* its case or digits. If it generates a carry, the process is
+* repeated with the one to its immediate left.
+*/
+char[] succ(char[] s)
+{
+if (s.length && isalnum(s[length - 1]))
+{
+	char[] r = s.dup;
+	size_t i = r.length - 1;
+	while (1)
+	{   dchar c = s[i];
+	    dchar carry;
+	    switch (c)
+	    {
+		case '9':
+		    c = '0';
+		    carry = '1';
+		    goto Lcarry;
+		case 'z':
+		case 'Z':
+		    c -= 'Z' - 'A';
+		    carry = c;
+		Lcarry:
+		    r[i] = cast(char)c;
+		    if (i == 0)
+		    {
+			char[] t = new char[r.length + 1];
+			t[0] = cast(char)carry;
+			t[1 .. length] = r[];
+			return t;
+		    }
+		    i--;
+		    break;
+		default:
+		    if (std.ctype.isalnum(c))
+			r[i]++;
+		    return r;
+	    }
+	}
+}
+return s;
+}
+unittest
+{
+debug(string) printf("std.string.succ.unittest\n");
+char[] r;
+r = succ(null);
+assert(r is null);
+r = succ("!@#$%");
+assert(r == "!@#$%");
+r = succ("1");
+assert(r == "2");
+r = succ("9");
+assert(r == "10");
+r = succ("999");
+assert(r == "1000");
+r = succ("zz99");
+assert(r == "aaa00");
+}
+/***********************************************
+* Replaces characters in str[] that are in from[]
+* with corresponding characters in to[] and returns the resulting
+* string.
+* Params:
+*	modifiers = a string of modifier characters
+* Modifiers:
+		<table border=1 cellspacing=0 cellpadding=5>
+		<tr> <th>Modifier <th>Description
+		<tr> <td><b>c</b> <td>Complement the list of characters in from[]
+		<tr> <td><b>d</b> <td>Removes matching characters with no corresponding replacement in to[]
+		<tr> <td><b>s</b> <td>Removes adjacent duplicates in the replaced characters
+		</table>
+	If modifier <b>d</b> is present, then the number of characters
+	in to[] may be only 0 or 1.
+	If modifier <b>d</b> is not present and to[] is null,
+	then to[] is taken _to be the same as from[].
+	If modifier <b>d</b> is not present and to[] is shorter
+	than from[], then to[] is extended by replicating the
+	last character in to[].
+	Both from[] and to[] may contain ranges using the <b>-</b>
+	character, for example <b>a-d</b> is synonymous with <b>abcd</b>.
+	Neither accept a leading <b>^</b> as meaning the complement of
+	the string (use the <b>c</b> modifier for that).
+*/
+char[] tr(char[] str, char[] from, char[] to, char[] modifiers = null)
+{
+int mod_c;
+int mod_d;
+int mod_s;
+foreach (char c; modifiers)
+{
+	switch (c)
+	{
+	    case 'c':	mod_c = 1; break;	// complement
+	    case 'd':	mod_d = 1; break;	// delete unreplaced chars
+	    case 's':	mod_s = 1; break;	// squeeze duplicated replaced chars
+	    default:	assert(0);
+	}
+}
+if (to is null && !mod_d)
+	to = from;
+char[] result = new char[str.length];
+result.length = 0;
+int m;
+dchar lastc;
+foreach (dchar c; str)
+{	dchar lastf;
+	dchar lastt;
+	dchar newc;
+	int n = 0;
+	for (size_t i = 0; i < from.length; )
+	{
+	    dchar f = std.utf.decode(from, i);
+	    //writefln("\tf = '%s', c = '%s', lastf = '%x', '%x', i = %d, %d", f, c, lastf, dchar.init, i, from.length);
+	    if (f == '-' && lastf != dchar.init && i < from.length)
+	    {
+		dchar nextf = std.utf.decode(from, i);
+		//writefln("\tlastf = '%s', c = '%s', nextf = '%s'", lastf, c, nextf);
+		if (lastf <= c && c <= nextf)
+		{
+		    n += c - lastf - 1;
+		    if (mod_c)
+			goto Lnotfound;
+		    goto Lfound;
+		}
+		n += nextf - lastf;
+		lastf = lastf.init;
+		continue;
+	    }
+	    if (c == f)
+	    {	if (mod_c)
+		    goto Lnotfound;
+		goto Lfound;
+	    }
+	    lastf = f;
+	    n++;
+	}
+	if (!mod_c)
+	    goto Lnotfound;
+	n = 0;			// consider it 'found' at position 0
+Lfound:
+	// Find the nth character in to[]
+	//writefln("\tc = '%s', n = %d", c, n);
+	dchar nextt;
+	for (size_t i = 0; i < to.length; )
+	{   dchar t = std.utf.decode(to, i);
+	    if (t == '-' && lastt != dchar.init && i < to.length)
+	    {
+		nextt = std.utf.decode(to, i);
+		//writefln("\tlastt = '%s', c = '%s', nextt = '%s', n = %d", lastt, c, nextt, n);
+		n -= nextt - lastt;
+		if (n < 0)
+		{
+		    newc = nextt + n + 1;
+		    goto Lnewc;
+		}
+		lastt = dchar.init;
+		continue;
+	    }
+	    if (n == 0)
+	    {	newc = t;
+		goto Lnewc;
+	    }
+	    lastt = t;
+	    nextt = t;
+	    n--;
+	}
+	if (mod_d)
+	    continue;
+	newc = nextt;
+Lnewc:
+	if (mod_s && m && newc == lastc)
+	    continue;
+	std.utf.encode(result, newc);
+	m = 1;
+	lastc = newc;
+	continue;
+Lnotfound:
+	std.utf.encode(result, c);
+	lastc = c;
+	m = 0;
+}
+return result;
+}
+unittest
+{
+debug(string) printf("std.string.tr.unittest\n");
+char[] r;
+//writefln("r = '%s'", r);
+r = tr("abcdef", "cd", "CD");
+assert(r == "abCDef");
+r = tr("abcdef", "b-d", "B-D");
+assert(r == "aBCDef");
+r = tr("abcdefgh", "b-dh", "B-Dx");
+assert(r == "aBCDefgx");
+r = tr("abcdefgh", "b-dh", "B-CDx");
+assert(r == "aBCDefgx");
+r = tr("abcdefgh", "b-dh", "B-BCDx");
+assert(r == "aBCDefgx");
+r = tr("abcdef", "ef", "*", "c");
+assert(r == "****ef");
+r = tr("abcdef", "ef", "", "d");
+assert(r == "abcd");
+r = tr("hello goodbye", "lo", null, "s");
+assert(r == "helo godbye");
+r = tr("hello goodbye", "lo", "x", "s");
+assert(r == "hex gxdbye");
+r = tr("14-Jul-87", "a-zA-Z", " ", "cs");
+assert(r == " Jul ");
+r = tr("Abc", "AAA", "XYZ");
+assert(r == "Xbc");
+}
+/* ************************************************
+* Version       : v0.3
+* Author        : David L. 'SpottedTiger' Davis
+* Date Created  : 31.May.05 Compiled and Tested with dmd v0.125
+* Date Modified : 01.Jun.05 Modified the function to handle the
+*               :           imaginary and complex float-point
+*               :           datatypes.
+*               :
+* Licence       : Public Domain / Contributed to Digital Mars
+*/
+/**
+* [in] char[] s can be formatted in the following ways:
+*
+* Integer Whole Number:
+* (for byte, ubyte, short, ushort, int, uint, long, and ulong)
+* ['+'|'-']digit(s)[U|L|UL]
+*
+* examples: 123, 123UL, 123L, +123U, -123L
+*
+* Floating-Point Number:
+* (for float, double, real, ifloat, idouble, and ireal)
+* ['+'|'-']digit(s)[.][digit(s)][[e-|e+]digit(s)][i|f|L|Li|fi]]
+*      or [nan|nani|inf|-inf]
+*
+* examples: +123., -123.01, 123.3e-10f, 123.3e-10fi, 123.3e-10L
+*
+* (for cfloat, cdouble, and creal)
+* ['+'|'-']digit(s)[.][digit(s)][[e-|e+]digit(s)][+]
+*         [digit(s)[.][digit(s)][[e-|e+]digit(s)][i|f|L|Li|fi]]
+*      or [nan|nani|nan+nani|inf|-inf]
+*
+* examples: nan, -123e-1+456.9e-10Li, +123e+10+456i, 123+456
+*
+* [in] bool bAllowSep
+* False by default, but when set to true it will accept the
+* separator characters "," and "_" within the string, but these
+* characters should be stripped from the string before using any
+* of the conversion functions like toInt(), toFloat(), and etc
+* else an error will occur.
+*
+* Also please note, that no spaces are allowed within the string
+* anywhere whether it's a leading, trailing, or embedded space(s),
+* thus they too must be stripped from the string before using this
+* function, or any of the conversion functions.
+*/
+final bool isNumeric(in char[] s, in bool bAllowSep = false)
+{
+int    iLen = s.length;
+bool   bDecimalPoint = false;
+bool   bExponent = false;
+bool   bComplex = false;
+char[] sx = std.string.tolower(s);
+int    j  = 0;
+char   c;
+//writefln("isNumeric(char[], bool = false) called!");
+// Empty string, return false
+if (iLen == 0)
+return false;
+// Check for NaN (Not a Number)
+if (sx == "nan" || sx == "nani" || sx == "nan+nani")
+return true;
+// Check for Infinity
+if (sx == "inf" || sx == "-inf")
+return true;
+// A sign is allowed only in the 1st character
+if (sx[0] == '-' || sx[0] == '+')
+j++;
+for (int i = j; i < iLen; i++)
+{
+c = sx[i];
+// Digits are good, continue checking
+// with the next character... ;)
+if (c >= '0' && c <= '9')
+continue;
+// Check for the complex type, and if found
+// reset the flags for checking the 2nd number.
+else if (c == '+')
+if (i > 0)
+{
+bDecimalPoint = false;
+bExponent = false;
+bComplex = true;
+continue;
+}
+else
+return false;
+// Allow only one exponent per number
+else if (c == 'e')
+{
+// A 2nd exponent found, return not a number
+if (bExponent)
+return false;
+if (i + 1 < iLen)
+{
+// Look forward for the sign, and if
+// missing then this is not a number.
+if (sx[i + 1] != '-' && sx[i + 1] != '+')
+return false;
+else
+{
+bExponent = true;
+i++;
+}
+}
+else
+// Ending in "E", return not a number
+return false;
+}
+// Allow only one decimal point per number to be used
+else if (c == '.' )
+{
+// A 2nd decimal point found, return not a number
+if (bDecimalPoint)
+return false;
+bDecimalPoint = true;
+continue;
+}
+// Check for ending literal characters: "f,u,l,i,ul,fi,li",
+// and wheater they're being used with the correct datatype.
+else if (i == iLen - 2)
+{
+// Integer Whole Number
+if (sx[i..iLen] == "ul" &&
+(!bDecimalPoint && !bExponent && !bComplex))
+return true;
+// Floating-Point Number
+else if ((sx[i..iLen] == "fi" || sx[i..iLen] == "li") &&
+(bDecimalPoint || bExponent || bComplex))
+return true;
+else if (sx[i..iLen] == "ul" &&
+(bDecimalPoint || bExponent || bComplex))
+return false;
+// Could be a Integer or a Float, thus
+// all these suffixes are valid for both
+else if (sx[i..iLen] == "ul" ||
+sx[i..iLen] == "fi" ||
+sx[i..iLen] == "li")
+return true;
+else
+return false;
+}
+else if (i == iLen - 1)
+{
+// Integer Whole Number
+if ((c == 'u' || c == 'l') &&
+(!bDecimalPoint && !bExponent && !bComplex))
+return true;
+// Check to see if the last character in the string
+// is the required 'i' character
+else if (bComplex)
+if (c == 'i')
+return true;
+else
+return false;
+// Floating-Point Number
+else if ((c == 'l' || c == 'f' || c == 'i') &&
+(bDecimalPoint || bExponent))
+return true;
+// Could be a Integer or a Float, thus
+// all these suffixes are valid for both
+else if (c == 'l' || c == 'f' || c == 'i')
+return true;
+else
+return false;
+}
+else
+// Check if separators are allow
+// to be in the numeric string
+if (bAllowSep == true && (c == '_' || c == ','))
+continue;
+else
+return false;
+}
+return true;
+}
+/// Allow any object as a parameter
+bool isNumeric(...)
+{
+return isNumeric(_arguments, _argptr);
+}
+/// Check only the first parameter, all others will be ignored.
+bool isNumeric(TypeInfo[] _arguments, va_list _argptr)
+{
+char[]  s  = "";
+wchar[] ws = "";
+dchar[] ds = "";
+//writefln("isNumeric(...) called!");
+if (_arguments.length == 0)
+return false;
+if (_arguments[0] == typeid(char[]))
+return isNumeric(va_arg!(char[])(_argptr));
+else if (_arguments[0] == typeid(wchar[]))
+return isNumeric(std.utf.toUTF8(va_arg!(wchar[])(_argptr)));
+else if (_arguments[0] == typeid(dchar[]))
+return isNumeric(std.utf.toUTF8(va_arg!(dchar[])(_argptr)));
+else if (_arguments[0] == typeid(real))
+return true;
+else if (_arguments[0] == typeid(double))
+return true;
+else if (_arguments[0] == typeid(float))
+return true;
+else if (_arguments[0] == typeid(ulong))
+return true;
+else if (_arguments[0] == typeid(long))
+return true;
+else if (_arguments[0] == typeid(uint))
+return true;
+else if (_arguments[0] == typeid(int))
+return true;
+else if (_arguments[0] == typeid(ushort))
+return true;
+else if (_arguments[0] == typeid(short))
+return true;
+else if (_arguments[0] == typeid(ubyte))
+{
+s.length = 1;
+s[0]= va_arg!(ubyte)(_argptr);
+return isNumeric(cast(char[])s);
+}
+else if (_arguments[0] == typeid(byte))
+{
+s.length = 1;
+s[0] = va_arg!(byte)(_argptr);
+return isNumeric(cast(char[])s);
+}
+else if (_arguments[0] == typeid(ireal))
+return true;
+else if (_arguments[0] == typeid(idouble))
+return true;
+else if (_arguments[0] == typeid(ifloat))
+return true;
+else if (_arguments[0] == typeid(creal))
+return true;
+else if (_arguments[0] == typeid(cdouble))
+return true;
+else if (_arguments[0] == typeid(cfloat))
+return true;
+else if (_arguments[0] == typeid(char))
+{
+s.length = 1;
+s[0] = va_arg!(char)(_argptr);
+return isNumeric(s);
+}
+else if (_arguments[0] == typeid(wchar))
+{
+ws.length = 1;
+ws[0] = va_arg!(wchar)(_argptr);
+return isNumeric(std.utf.toUTF8(ws));
+}
+else if (_arguments[0] == typeid(dchar))
+{
+ds.length =  1;
+ds[0] = va_arg!(dchar)(_argptr);
+return isNumeric(std.utf.toUTF8(ds));
+}
+//else if (_arguments[0] == typeid(cent))
+//    return true;
+//else if (_arguments[0] == typeid(ucent))
+//    return true;
+else
+return false;
+}
+unittest
+{
+debug (string) printf("isNumeric(in char[], bool = false).unittest\n");
+char[] s;
+// Test the isNumeric(in char[]) function
+assert(isNumeric("1") == true );
+assert(isNumeric("1.0") == true );
+assert(isNumeric("1e-1") == true );
+assert(isNumeric("12345xxxx890") == false );
+assert(isNumeric("567L") == true );
+assert(isNumeric("23UL") == true );
+assert(isNumeric("-123..56f") == false );
+assert(isNumeric("12.3.5.6") == false );
+assert(isNumeric(" 12.356") == false );
+assert(isNumeric("123 5.6") == false );
+assert(isNumeric("1233E-1+1.0e-1i") == true );
+assert(isNumeric("123.00E-5+1234.45E-12Li") == true);
+assert(isNumeric("123.00e-5+1234.45E-12iL") == false);
+assert(isNumeric("123.00e-5+1234.45e-12uL") == false);
+assert(isNumeric("123.00E-5+1234.45e-12lu") == false);
+assert(isNumeric("123fi") == true);
+assert(isNumeric("123li") == true);
+assert(isNumeric("--123L") == false);
+assert(isNumeric("+123.5UL") == false);
+assert(isNumeric("123f") == true);
+assert(isNumeric("123.u") == false);
+assert(isNumeric(std.string.toString(real.nan)) == true);
+assert(isNumeric(std.string.toString(-real.infinity)) == true);
+assert(isNumeric(std.string.toString(123e+2+1234.78Li)) == true);
+s = "$250.99-";
+assert(isNumeric(s[1..s.length - 2]) == true);
+assert(isNumeric(s) == false);
+assert(isNumeric(s[0..s.length - 1]) == false);
+// These test calling the isNumeric(...) function
+assert(isNumeric(1,123UL) == true);
+assert(isNumeric('2') == true);
+assert(isNumeric('x') == false);
+assert(isNumeric(cast(byte)0x57) == false); // 'W'
+assert(isNumeric(cast(byte)0x37) == true);  // '7'
+assert(isNumeric(cast(wchar[])"145.67") == true);
+assert(isNumeric(cast(dchar[])"145.67U") == false);
+assert(isNumeric(123_000.23fi) == true);
+assert(isNumeric(123.00E-5+1234.45E-12Li) == true);
+assert(isNumeric(real.nan) == true);
+assert(isNumeric(-real.infinity) == true);
+}
+/*****************************
+* Soundex algorithm.
+*
+* The Soundex algorithm converts a word into 4 characters
+* based on how the word sounds phonetically. The idea is that
+* two spellings that sound alike will have the same Soundex
+* value, which means that Soundex can be used for fuzzy matching
+* of names.
+*
+* Params:
+*	string = String to convert to Soundex representation.
+*	buffer = Optional 4 char array to put the resulting Soundex
+*		characters into. If null, the return value
+*		buffer will be allocated on the heap.
+* Returns:
+*	The four character array with the Soundex result in it.
+*	Returns null if there is no Soundex representation for the string.
+*
+* See_Also:
+*	$(LINK2 http://en.wikipedia.org/wiki/Soundex, Wikipedia),
+*	$(LINK2 http://www.archives.gov/publications/general-info-leaflets/55.html, The Soundex Indexing System)
+*
+* Bugs:
+*	Only works well with English names.
+*	There are other arguably better Soundex algorithms,
+*	but this one is the standard one.
+*/
+char[] soundex(char[] string, char[] buffer = null)
+in
+{
+assert(!buffer || buffer.length >= 4);
+}
+out (result)
+{
+if (result)
+{
+	assert(result.length == 4);
+	assert(result[0] >= 'A' && result[0] <= 'Z');
+	foreach (char c; result[1 .. 4])
+	    assert(c >= '0' && c <= '6');
+}
+}
+body
+{
+static char[26] dex =
+// ABCDEFGHIJKLMNOPQRSTUVWXYZ
+"01230120022455012623010202";
+int b = 0;
+char lastc;
+foreach (char c; string)
+{
+	if (c >= 'a' && c <= 'z')
+	    c -= 'a' - 'A';
+	else if (c >= 'A' && c <= 'Z')
+	{
+	    ;
+	}
+	else
+	{   lastc = lastc.init;
+	    continue;
+	}
+	if (b == 0)
+	{
+	    if (!buffer)
+		buffer = new char[4];
+	    buffer[0] = c;
+	    b++;
+	    lastc = dex[c - 'A'];
+	}
+	else
+	{
+	    if (c == 'H' || c == 'W')
+		continue;
+	    if (c == 'A' || c == 'E' || c == 'I' || c == 'O' || c == 'U')
+		lastc = lastc.init;
+	    c = dex[c - 'A'];
+	    if (c != '0' && c != lastc)
+	    {
+		buffer[b] = c;
+		b++;
+		lastc = c;
+	    }
+	}
+	if (b == 4)
+	    goto Lret;
+}
+if (b == 0)
+	buffer = null;
+else
+	buffer[b .. 4] = '0';
+Lret:
+return buffer;
+}
+unittest
+{   char[4] buffer;
+assert(soundex(null) == null);
+assert(soundex("") == null);
+assert(soundex("0123^&^^**&^") == null);
+assert(soundex("Euler") == "E460");
+assert(soundex(" Ellery ") == "E460");
+assert(soundex("Gauss") == "G200");
+assert(soundex("Ghosh") == "G200");
+assert(soundex("Hilbert") == "H416");
+assert(soundex("Heilbronn") == "H416");
+assert(soundex("Knuth") == "K530");
+assert(soundex("Kant", buffer) == "K530");
+assert(soundex("Lloyd") == "L300");
+assert(soundex("Ladd") == "L300");
+assert(soundex("Lukasiewicz", buffer) == "L222");
+assert(soundex("Lissajous") == "L222");
+assert(soundex("Robert") == "R163");
+assert(soundex("Rupert") == "R163");
+assert(soundex("Rubin") == "R150");
+assert(soundex("Washington") == "W252");
+assert(soundex("Lee") == "L000");
+assert(soundex("Gutierrez") == "G362");
+assert(soundex("Pfister") == "P236");
+assert(soundex("Jackson") == "J250");
+assert(soundex("Tymczak") == "T522");
+assert(soundex("Ashcraft") == "A261");
+assert(soundex("Woo") == "W000");
+assert(soundex("Pilgrim") == "P426");
+assert(soundex("Flingjingwaller") == "F452");
+assert(soundex("PEARSE") == "P620");
+assert(soundex("PIERCE") == "P620");
+assert(soundex("Price") == "P620");
+assert(soundex("CATHY") == "C300");
+assert(soundex("KATHY") == "K300");
+assert(soundex("Jones") == "J520");
+assert(soundex("johnsons") == "J525");
+assert(soundex("Hardin") == "H635");
+assert(soundex("Martinez") == "M635");
+}
+/***************************************************
+* Construct an associative array consisting of all
+* abbreviations that uniquely map to the strings in values.
+*
+* This is useful in cases where the user is expected to type
+* in one of a known set of strings, and the program will helpfully
+* autocomplete the string once sufficient characters have been
+* entered that uniquely identify it.
+* Example:
+* ---
+* import std.stdio;
+* import std.string;
+*
+* void main()
+* {
+*    static char[][] list = [ "food", "foxy" ];
+*
+*    auto abbrevs = std.string.abbrev(list);
+*
+*    foreach (key, value; abbrevs)
+*    {
+*       writefln("%s => %s", key, value);
+*    }
+* }
+* ---
+* produces the output:
+* <pre>
+* fox =&gt; foxy
+* food =&gt; food
+* foxy =&gt; foxy
+* foo =&gt; food
+* </pre>
+*/
+char[][char[]] abbrev(char[][] values)
+{
+char[][char[]] result;
+// Make a copy when sorting so we follow COW principles.
+values = values.dup.sort;
+size_t values_length = values.length;
+size_t lasti = values_length;
+size_t nexti;
+char[] nv;
+char[] lv;
+for (size_t i = 0; i < values_length; i = nexti)
+{	char[] value = values[i];
+	// Skip dups
+	for (nexti = i + 1; nexti < values_length; nexti++)
+	{   nv = values[nexti];
+	    if (value != values[nexti])
+		break;
+	}
+	for (size_t j = 0; j < value.length; j += std.utf.stride(value, j))
+	{   char[] v = value[0 .. j];
+	    if ((nexti == values_length || j > nv.length || v != nv[0 .. j]) &&
+		(lasti == values_length || j > lv.length || v != lv[0 .. j]))
+		result[v] = value;
+	}
+	result[value] = value;
+	lasti = i;
+	lv = value;
+}
+return result;
+}
+unittest
+{
+debug(string) printf("string.abbrev.unittest\n");
+char[][] values;
+values ~= "hello";
+values ~= "hello";
+values ~= "he";
+char[][char[]] r;
+r = abbrev(values);
+char[][] keys = r.keys.dup;
+keys.sort;
+assert(keys.length == 4);
+assert(keys[0] == "he");
+assert(keys[1] == "hel");
+assert(keys[2] == "hell");
+assert(keys[3] == "hello");
+assert(r[keys[0]] == "he");
+assert(r[keys[1]] == "hello");
+assert(r[keys[2]] == "hello");
+assert(r[keys[3]] == "hello");
+}
+/******************************************
+* Compute column number after string if string starts in the
+* leftmost column, which is numbered starting from 0.
+*/
+size_t column(char[] string, int tabsize = 8)
+{
+size_t column;
+foreach (dchar c; string)
+{
+	switch (c)
+	{
+	    case '\t':
+		column = (column + tabsize) / tabsize * tabsize;
+		break;
+	    case '\r':
+	    case '\n':
+	    case PS:
+	    case LS:
+		column = 0;
+		break;
+	    default:
+		column++;
+		break;
+	}
+}
+return column;
+}
+unittest
+{
+debug(string) printf("string.column.unittest\n");
+assert(column(null) == 0);
+assert(column("") == 0);
+assert(column("\t") == 8);
+assert(column("abc\t") == 8);
+assert(column("12345678\t") == 16);
+}
+/******************************************
+* Wrap text into a paragraph.
+*
+* The input text string s is formed into a paragraph
+* by breaking it up into a sequence of lines, delineated
+* by \n, such that the number of columns is not exceeded
+* on each line.
+* The last line is terminated with a \n.
+* Params:
+*	s = text string to be wrapped
+*	columns = maximum number of _columns in the paragraph
+*	firstindent = string used to _indent first line of the paragraph
+*	indent = string to use to _indent following lines of the paragraph
+*	tabsize = column spacing of tabs
+* Returns:
+*	The resulting paragraph.
+*/
+char[] wrap(char[] s, int columns = 80, char[] firstindent = null,
+	char[] indent = null, int tabsize = 8)
+{
+char[] result;
+int col;
+int spaces;
+bool inword;
+bool first = true;
+size_t wordstart;
+result.length = firstindent.length + s.length;
+result.length = firstindent.length;
+result[] = firstindent[];
+col = column(result, tabsize);
+foreach (size_t i, dchar c; s)
+{
+	if (iswhite(c))
+	{
+	    if (inword)
+	    {
+		if (first)
+		{
+		    ;
+		}
+		else if (col + 1 + (i - wordstart) > columns)
+		{
+		    result ~= '\n';
+		    result ~= indent;
+		    col = column(indent, tabsize);
+		}
+		else
+		{   result ~= ' ';
+		    col += 1;
+		}
+		result ~= s[wordstart .. i];
+		col += i - wordstart;
+		inword = false;
+		first = false;
+	    }
+	}
+	else
+	{
+	    if (!inword)
+	    {
+		wordstart = i;
+		inword = true;
+	    }
+	}
+}
+if (inword)
+{
+	if (col + 1 + (s.length - wordstart) >= columns)
+	{
+	    result ~= '\n';
+	    result ~= indent;
+	}
+	else if (result.length != firstindent.length)
+	    result ~= ' ';
+	result ~= s[wordstart .. s.length];
+}
+result ~= '\n';
+return result;
+}
+unittest
+{
+debug(string) printf("string.wrap.unittest\n");
+assert(wrap(null) == "\n");
+assert(wrap(" a b   df ") == "a b df\n");
+//writefln("'%s'", wrap(" a b   df ",3));
+assert(wrap(" a b   df ", 3) == "a b\ndf\n");
+assert(wrap(" a bc   df ", 3) == "a\nbc\ndf\n");
+//writefln("'%s'", wrap(" abcd   df ",3));
+assert(wrap(" abcd   df ", 3) == "abcd\ndf\n");
+assert(wrap("x") == "x\n");
+assert(wrap("u u") == "u u\n");
+}
+/***************************
+* Does string s[] start with an email address?
+* Returns:
+*	null	it does not
+*	char[]	it does, and this is the slice of s[] that is that email address
+* References:
+*	RFC2822
+*/
+char[] isEmail(char[] s)
+{   size_t i;
+if (!isalpha(s[0]))
+	goto Lno;
+for (i = 1; 1; i++)
+{
+	if (i == s.length)
+	    goto Lno;
+	auto c = s[i];
+	if (isalnum(c))
+	    continue;
+	if (c == '-' || c == '_' || c == '.')
+	    continue;
+	if (c != '@')
+	    goto Lno;
+	i++;
+	break;
+}
+//writefln("test1 '%s'", s[0 .. i]);
+/* Now do the part past the '@'
+*/
+size_t lastdot;
+for (; i < s.length; i++)
+{
+	auto c = s[i];
+	if (isalnum(c))
+	    continue;
+	if (c == '-' || c == '_')
+	    continue;
+	if (c == '.')
+	{
+	    lastdot = i;
+	    continue;
+	}
+	break;
+}
+if (!lastdot || (i - lastdot != 3 && i - lastdot != 4))
+	goto Lno;
+return s[0 .. i];
+Lno:
+return null;
+}
+/***************************
+* Does string s[] start with a URL?
+* Returns:
+*	null	it does not
+*	char[]	it does, and this is the slice of s[] that is that URL
+*/
+char[] isURL(char[] s)
+{
+/* Must start with one of:
+*	http://
+*	https://
+*	www.
+*/
+size_t i;
+if (s.length <= 4)
+	goto Lno;
+//writefln("isURL(%s)", s);
+if (s.length > 7 && std.string.icmp(s[0 .. 7], "http://") == 0)
+	i = 7;
+else if (s.length > 8 && std.string.icmp(s[0 .. 8], "https://") == 0)
+	i = 8;
+//    if (icmp(s[0 .. 4], "www.") == 0)
+//	i = 4;
+else
+	goto Lno;
+size_t lastdot;
+for (; i < s.length; i++)
+{
+	auto c = s[i];
+	if (isalnum(c))
+	    continue;
+	if (c == '-' || c == '_' || c == '?' ||
+	    c == '=' || c == '%' || c == '&' ||
+	    c == '/' || c == '+' || c == '#' ||
+	    c == '~')
+	    continue;
+	if (c == '.')
+	{
+	    lastdot = i;
+	    continue;
+	}
+	break;
+}
+//if (!lastdot || (i - lastdot != 3 && i - lastdot != 4))
+if (!lastdot)
+	goto Lno;
+return s[0 .. i];
+Lno:
+return null;
+}

Mercurial > projects > ldc

comparison lphobos/std/string.d @ 108:288fe1029e1f trunk