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<article><h2>D mode</h2><form><textarea id="code" name="code">/* 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: $(WEB digitalmars.com, Walter Bright), Don ClugstonSource: $(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 $(XREFstring,format).
Parameters:
A = tuple of constants, which can be strings, characters, or integral values.
Formats: * The formats supported are %s for strings, and %% * for the % character.Example:---import std.metastrings;import std.stdio;
void main(){ string s = Format!("Arg %s = %s", "foo", 27); writefln(s); // "Arg foo = 27"} * --- */
template Format(A...){ static if (A.length == 0) enum Format = ""; else static if (is(typeof(A[0]) : const(char)[])) enum Format = FormatString!(A[0], A[1..$]); 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..$],A); }}
unittest{ auto s = Format!("hel%slo", "world", -138, 'c', true); assert(s == "helworldlo-138ctrue", "[" ~ s ~ "]");}
/** * Convert constant argument to a string. */
template toStringNow(ulong v){ static if (v < 10) enum toStringNow = "" ~ cast(char)(v + '0'); else enum toStringNow = toStringNow!(v / 10) ~ toStringNow!(v % 10);}
unittest{ static assert(toStringNow!(1uL << 62) == "4611686018427387904");}
/// dittotemplate toStringNow(long v){ static if (v < 0) enum toStringNow = "-" ~ toStringNow!(cast(ulong) -v); else enum toStringNow = toStringNow!(cast(ulong) v);}
unittest{ static assert(toStringNow!(0x100000000) == "4294967296"); static assert(toStringNow!(-138L) == "-138");}
/// dittotemplate toStringNow(uint U){ enum toStringNow = toStringNow!(cast(ulong)U);}
/// dittotemplate toStringNow(int I){ enum toStringNow = toStringNow!(cast(long)I);}
/// dittotemplate toStringNow(bool B){ enum toStringNow = B ? "true" : "false";}
/// dittotemplate toStringNow(string S){ enum toStringNow = S;}
/// dittotemplate toStringNow(char C){ enum toStringNow = "" ~ C;}
/******** * Parse unsigned integer literal from the start of string s. * returns: * .value = the integer literal as a string, * .rest = the string following the integer literal * Otherwise: * .value = null, * .rest = s */
template parseUinteger(const(char)[] s){ static if (s.length == 0) { enum value = ""; enum rest = ""; } else static if (s[0] >= '0' && s[0] <= '9') { enum value = s[0] ~ parseUinteger!(s[1..$]).value; enum rest = parseUinteger!(s[1..$]).rest; } else { enum value = ""; enum rest = s; }}
/********Parse integer literal optionally preceded by $(D '-') from the startof string $(D s).
Returns: .value = the integer literal as a string, .rest = the string following the integer literal
Otherwise: .value = null, .rest = s*/
template parseInteger(const(char)[] s){ static if (s.length == 0) { enum value = ""; enum rest = ""; } else static if (s[0] >= '0' && s[0] <= '9') { enum value = s[0] ~ parseUinteger!(s[1..$]).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;/// Dittodeprecated alias parseUinteger ParseUinteger;/// Dittodeprecated alias parseUinteger ParseInteger;
</textarea></form>
<script> var editor = CodeMirror.fromTextArea(document.getElementById("code"), { lineNumbers: true, matchBrackets: true, indentUnit: 4, mode: "text/x-d" }); </script>
<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>
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