root/trunk/Serial/StringSourceSink.d

module StringSourceSink;

import Interface;

class Si : Sink!(char)
{
    char[] str;
    int at = 0;

    char[] get() { return str[0..at]; }

    this(uint len = 16)
    {
        if (len <= at) len = 1;
        str.length = len;
    }

    void Dump(char c)
    {
        if(at >= str.length) str.length = at * 2;
        str[at++] = c;
    }

    void Dump(char[] c)
    {
        if(at + c.length >= str.length) str.length = at + c.length + 10;
        str[at..at+c.length] = c;
        at += c.length;
    }
}

class So : Source!(char)
{
    this(char[] s){ str = s.dup; }

    char[] str;
    uint at = 0;
    
    bool Peek(char t) { return at < str.length  && str[at] == t; }
    char Peek() { return str[at]; }

    bool Pick(ref char t, bool must)
    {
        if(at < str.length)
        {
            t = str[at];
            at++;
            return true;
        }
        else if(must) throw new Error("\n"~str[at..$]~"\n"~t~"<<");
        else return false;
    }

    bool Pick(char[] ts, bool must)
    {
        if(at + ts.length > str.length || ts != str[at..at+ts.length])
        {
            if(must) throw new Error("\n"~str[at..$]~"\n"~ts);
            return false;
        }
        at += ts.length;
        return true;
    }
}