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<h2>D mode</h2>
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/* D demo code // copied from phobos/sd/metastrings.d */
// Written in the D programming language.
/**
Templates with which to do compile-time manipulation of strings.
Macros:
WIKI = Phobos/StdMetastrings
Copyright: Copyright Digital Mars 2007 - 2009.
License: <a href="http://www.boost.org/LICENSE_1_0.txt">Boost License 1.0</a>.
Authors: jQuery(WEB digitalmars.com, Walter Bright),
Don Clugston
Source: jQuery(PHOBOSSRC std/_metastrings.d)
*/
/*
Copyright Digital Mars 2007 - 2009.
Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENSE_1_0.txt or copy at
http://www.boost.org/LICENSE_1_0.txt)
*/
module std.metastrings;
/**
Formats constants into a string at compile time. Analogous to jQuery(XREF
string,format).
Parameters:
A = tuple of constants, which can be strings, characters, or integral
values.
Formats:
* The formats supported are %s for strings, and %%
* for the % character.
Example:
---
import std.metastrings;
import std.stdio;
void main()
{
string s = Format!("Arg %s = %s", "foo", 27);
writefln(s); // "Arg foo = 27"
}
* ---
*/
template Format(A...)
{
static if (A.length == 0)
enum Format = "";
else static if (is(typeof(A[0]) : const(char)[]))
enum Format = FormatString!(A[0], A[1..$]);
else
enum Format = toStringNow!(A[0]) ~ Format!(A[1..$]);
}
template FormatString(const(char)[] F, A...)
{
static if (F.length == 0)
enum FormatString = Format!(A);
else static if (F.length == 1)
enum FormatString = F[0] ~ Format!(A);
else static if (F[0..2] == "%s")
enum FormatString
= toStringNow!(A[0]) ~ FormatString!(F[2..$],A[1..$]);
else static if (F[0..2] == "%%")
enum FormatString = "%" ~ FormatString!(F[2..$],A);
else
{
static assert(F[0] != '%', "unrecognized format %" ~ F[1]);
enum FormatString = F[0] ~ FormatString!(F[1..$],A);
}
}
unittest
{
auto s = Format!("hel%slo", "world", -138, 'c', true);
assert(s == "helworldlo-138ctrue", "[" ~ s ~ "]");
}
/**
* Convert constant argument to a string.
*/
template toStringNow(ulong v)
{
static if (v < 10)
enum toStringNow = "" ~ cast(char)(v + '0');
else
enum toStringNow = toStringNow!(v / 10) ~ toStringNow!(v % 10);
}
unittest
{
static assert(toStringNow!(1uL << 62) == "4611686018427387904");
}
/// ditto
template toStringNow(long v)
{
static if (v < 0)
enum toStringNow = "-" ~ toStringNow!(cast(ulong) -v);
else
enum toStringNow = toStringNow!(cast(ulong) v);
}
unittest
{
static assert(toStringNow!(0x100000000) == "4294967296");
static assert(toStringNow!(-138L) == "-138");
}
/// ditto
template toStringNow(uint U)
{
enum toStringNow = toStringNow!(cast(ulong)U);
}
/// ditto
template toStringNow(int I)
{
enum toStringNow = toStringNow!(cast(long)I);
}
/// ditto
template toStringNow(bool B)
{
enum toStringNow = B ? "true" : "false";
}
/// ditto
template toStringNow(string S)
{
enum toStringNow = S;
}
/// ditto
template toStringNow(char C)
{
enum toStringNow = "" ~ C;
}
/********
* Parse unsigned integer literal from the start of string s.
* returns:
* .value = the integer literal as a string,
* .rest = the string following the integer literal
* Otherwise:
* .value = null,
* .rest = s
*/
template parseUinteger(const(char)[] s)
{
static if (s.length == 0)
{
enum value = "";
enum rest = "";
}
else static if (s[0] >= '0' && s[0] <= '9')
{
enum value = s[0] ~ parseUinteger!(s[1..$]).value;
enum rest = parseUinteger!(s[1..$]).rest;
}
else
{
enum value = "";
enum rest = s;
}
}
/********
Parse integer literal optionally preceded by jQuery(D '-') from the start
of string jQuery(D s).
Returns:
.value = the integer literal as a string,
.rest = the string following the integer literal
Otherwise:
.value = null,
.rest = s
*/
template parseInteger(const(char)[] s)
{
static if (s.length == 0)
{
enum value = "";
enum rest = "";
}
else static if (s[0] >= '0' && s[0] <= '9')
{
enum value = s[0] ~ parseUinteger!(s[1..$]).value;
enum rest = parseUinteger!(s[1..$]).rest;
}
else static if (s.length >= 2 &&
s[0] == '-' && s[1] >= '0' && s[1] <= '9')
{
enum value = s[0..2] ~ parseUinteger!(s[2..$]).value;
enum rest = parseUinteger!(s[2..$]).rest;
}
else
{
enum value = "";
enum rest = s;
}
}
unittest
{
assert(parseUinteger!("1234abc").value == "1234");
assert(parseUinteger!("1234abc").rest == "abc");
assert(parseInteger!("-1234abc").value == "-1234");
assert(parseInteger!("-1234abc").rest == "abc");
}
/**
Deprecated aliases held for backward compatibility.
*/
deprecated alias toStringNow ToString;
/// Ditto
deprecated alias parseUinteger ParseUinteger;
/// Ditto
deprecated alias parseUinteger ParseInteger;
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<p>Simple mode that handle D-Syntax (<a href="http://www.dlang.org">DLang Homepage</a>).</p>
<p><strong>MIME types defined:</strong> <code>text/x-d</code>
.</p>
</article>