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view tango/tango/io/Print.d @ 132:1700239cab2e trunk
[svn r136] MAJOR UNSTABLE UPDATE!!!
Initial commit after moving to Tango instead of Phobos.
Lots of bugfixes...
This build is not suitable for most things.
author | lindquist |
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date | Fri, 11 Jan 2008 17:57:40 +0100 |
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/******************************************************************************* copyright: Copyright (c) 2007 Kris Bell. All rights reserved license: BSD style: $(LICENSE) version: Feb 2007: Separated from Stdout author: Kris *******************************************************************************/ module tango.io.Print; private import tango.io.model.IBuffer, tango.io.model.IConduit; private import tango.text.convert.Layout; /******************************************************************************* A bridge between a Layout instance and a Buffer. This is used for the Stdout & Stderr globals, but can be used for general purpose buffer-formatting as desired. The Template type 'T' dictates the text arrangement within the target buffer ~ one of char, wchar or dchar (utf8, utf16, or utf32). Print exposes this style of usage: --- auto print = new Print!(char) (...); print ("hello"); => hello print (1); => 1 print (3.14); => 3.14 print ('b'); => b print (1, 2, 3); => 1, 2, 3 print ("abc", 1, 2, 3); => abc, 1, 2, 3 print ("abc", 1, 2) ("foo"); => abc, 1, 2foo print ("abc") ("def") (3.14); => abcdef3.14 print.format ("abc {}", 1); => abc 1 print.format ("abc {}:{}", 1, 2); => abc 1:2 print.format ("abc {1}:{0}", 1, 2); => abc 2:1 print.format ("abc ", 1); => abc --- Note that the last example does not throw an exception. There are several use-cases where dropping an argument is legitimate, so we're currently not enforcing any particular trap mechanism. Flushing the output is achieved through the flush() method, or via an empty pair of parens: --- print ("hello world") (); print ("hello world").flush; print.format ("hello {}", "world") (); print.format ("hello {}", "world").flush; --- Special character sequences, such as "\n", are written directly to the output without any translation (though an output-filter could be inserted to perform translation as required). Platform-specific newlines are generated instead via the newline() method, which also flushes the output when configured to do so: --- print ("hello ") ("world").newline; print.format ("hello {}", "world").newline; print.formatln ("hello {}", "world"); --- The format() method supports the range of formatting options exposed by tango.text.convert.Layout and extensions thereof; including the full I18N extensions where configured in that manner. To create a French instance of Print: --- import tango.text.locale.Locale; auto locale = new Locale (Culture.getCulture ("fr-FR")); auto print = new Print!(char) (locale, ...); --- Note that Print is *not* intended to be thread-safe. Use either tango.util.log.Trace or the standard logging facilities in order to enable atomic console I/O *******************************************************************************/ class Print(T) : OutputStream { private T[] eol; private OutputStream output; private Layout!(T) convert; private bool flushLines; public alias print opCall; version (Win32) private const T[] Eol = "\r\n"; else private const T[] Eol = "\n"; /********************************************************************** Construct a Print instance, tying the provided stream to a layout formatter **********************************************************************/ this (Layout!(T) convert, OutputStream output, T[] eol = Eol) { assert (convert); assert (output); this.eol = eol; this.output = output; this.convert = convert; } /********************************************************************** Layout using the provided formatting specification **********************************************************************/ final Print format (T[] fmt, ...) { convert (&sink, _arguments, _argptr, fmt); return this; } /********************************************************************** Layout using the provided formatting specification **********************************************************************/ final Print formatln (T[] fmt, ...) { convert (&sink, _arguments, _argptr, fmt); return newline; } /********************************************************************** Unformatted layout, with commas inserted between args. Currently supports a maximum of 24 arguments **********************************************************************/ final Print print (...) { static T[] slice = "{}, {}, {}, {}, {}, {}, {}, {}, " "{}, {}, {}, {}, {}, {}, {}, {}, " "{}, {}, {}, {}, {}, {}, {}, {}, "; assert (_arguments.length <= slice.length/4, "Print :: too many arguments"); if (_arguments.length is 0) output.flush; else convert (&sink, _arguments, _argptr, slice[0 .. _arguments.length * 4 - 2]); return this; } /*********************************************************************** Output a newline and optionally flush ***********************************************************************/ final Print newline () { output.write (eol); if (flushLines) output.flush; return this; } /********************************************************************** Control implicit flushing of newline(), where true enables flushing. An explicit flush() will always flush the output. **********************************************************************/ final Print flush (bool yes) { flushLines = yes; return this; } /********************************************************************** Return the associated output stream **********************************************************************/ final OutputStream stream () { return output; } /********************************************************************** Set the associated output stream **********************************************************************/ final Print stream (OutputStream output) { this.output = output; return this; } /********************************************************************** Return the associated Layout **********************************************************************/ final Layout!(T) layout () { return convert; } /********************************************************************** Set the associated Layout **********************************************************************/ final Print layout (Layout!(T) layout) { convert = layout; return this; } /********************************************************************** Sink for passing to the formatter **********************************************************************/ private final uint sink (T[] s) { return output.write (s); } /**********************************************************************/ /********************* OutputStream Interface *************************/ /**********************************************************************/ /*********************************************************************** Return the host conduit ***********************************************************************/ IConduit conduit () { return output.conduit; } /*********************************************************************** Write to conduit from a source array. The provided src content will be written to the conduit. Returns the number of bytes written from src, which may be less than the quantity provided ***********************************************************************/ uint write (void[] src) { return output.write (src); } /********************************************************************** Flush the output stream **********************************************************************/ final OutputStream flush () { output.flush; return this; } /*********************************************************************** Transfer the content of another conduit to this one. Returns a reference to this class, and throws IOException on failure. ***********************************************************************/ OutputStream copy (InputStream src) { output.copy (src); return this; } /*********************************************************************** Close the output ***********************************************************************/ void close () { output.close; } } debug (Print) { import tango.io.GrowBuffer; import tango.text.convert.Layout; void main() { auto print = new Print!(char) (new Layout!(char), new GrowBuffer); for (int i=0;i < 1000; i++) print(i).newline; } }