How to resolve the algorithm Read a file character by character/UTF8 step by step in the zkl programming language

Published on 12 May 2024 09:40 PM
#Zkl

How to resolve the algorithm Read a file character by character/UTF8 step by step in the zkl programming language

Table of Contents

Problem Statement

Read a file one character at a time, as opposed to reading the entire file at once. The solution may be implemented as a procedure, which returns the next character in the file on each consecutive call (returning EOF when the end of the file is reached). The procedure should support the reading of files containing UTF8 encoded wide characters, returning whole characters for each consecutive read.

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Read a file character by character/UTF8 step by step in the zkl programming language

Source code in the zkl programming language

fcn readUTF8c(chr,s=""){ // transform UTF-8 character stream
   s+=chr;
   try{ s.len(8); return(s) }
   catch{ if(s.len()>6) throw(__exception) } // 6 bytes max for UTF-8
   return(Void.Again,s);  // call me again with s & another character
}

fcn utf8Walker(obj){
   obj.walker(3)  // read characters
   .tweak(readUTF8c)
}

s:="-->\u20AC123";  // --> e2,82,ac,31,32,33 == -->€123
utf8Walker(s).walk().println();

w:=utf8Walker(Data(Void,s,"\n")); // Data is a byte bucket
foreach c in (utf8Walker(Data(Void,s,"\n"))){ print(c) }

utf8Walker(Data(Void,0xe2,0x82,"123456")).walk().println(); // € is short 1 byte

stream:=Data(Void,s,"\n").howza(3); // character stream
stream.pump(List,readUTF8c,"print")

File("foo.txt","rb").howza(3).pump(List,readUTF8c,"print");

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