readline from char[]

[Derek Parnell]

On Sun, 6 May 2007 11:31:14 +0200, Jan Hanselaer wrote:

> Hi
> 
> Is it possible to read lines from a char[] buffer? I ask this because 
> reading lines directly from a file (with a BufferedStream) seems to be very 
> slow.
> So when I can first load my file
> 
> char[] file = cast(char[])std.file.read("filename");
> 
> and then read lines from file that would go faster I presume.
> 
> But I don't see a way to do this.
> 
> Anyone with an idea for this problem?
> 
Here are two routines that I use ...

// -----------------
import std.file;
import std.string;

enum GetOpt
{
    Exists = 'e',   // Must exist otherwise Get fails.
    Always = 'a'    // Get always returns something, even if it's just
                    //   empty lines for a missing file.
}

// Read an entire file into a string.
char[] GetText(char[] pFileName, GetOpt pOpt = GetOpt.Always)
{
    char[] lFileText;
    if (std.file.exists( pFileName))
    {
        lFileText = cast(char[]) std.file.read(pFileName);
        // Ensure last line has a EOL.
        if ( (lFileText.length == 0) ||
             (lFileText[$-1] != '\n'))
             lFileText ~= std.path.linesep;
    }
    else if (pOpt == GetOpt.Exists) 
    {
        throw new Exception( std.string.format("File '%s' not found.",
				 pFileName));
    }
    return lFileText;

}

// Read a entire file in to a set of lines (strings).
char[][] GetTextLines(char[] pFileName, GetOpt pOpt = GetOpt.Always)
{
    char[][] lLines;
    char[]   lText;
    lText = GetText(pFileName, pOpt);
    lLines = std.string.splitlines( lText );
    return lLines;
}


-- 
Derek Parnell
Melbourne, Australia
"Justice for David Hicks!"
skype: derek.j.parnell