why ; ?

[Tomasz Sowinski]

bearophile Wrote:

> Tomasz Sowinski Wrote:
> 
> As you say such things of D probably aren't going to change, but with some careful design most (I think all) of those problems can be solved.
> And you can even go all the way :-)
> 
> This is a little old D example code of mine:
> 
> import std.stdio, std.stream, std.string, std.ctype, std.gc;
> 
> void traduct(char[] n, char[] digits, int start, char[][] words, char[][][char[]] gdict) {
>     if (start >= digits.length)
>         writefln(n, ": ", words.join(" "));
>     else {
>         auto found_word = false;
>         for(auto i = start; i < digits.length; i++)
>             if (digits[start .. i+1] in gdict) {
>                 found_word = true;
>                 foreach(hit; gdict[digits[start .. i+1]])
>                     traduct(n, digits, i+1, words ~ [hit], gdict);
>             }
>         if (!found_word && (!words || (words && !std.ctype.isdigit(words[words.length-1][0]))))
>             traduct(n, digits, start+1, words ~ [digits[start..start+1]], gdict);
>     }
> }
> 
> void main() {
>     std.gc.disable();
>     auto gtable = maketrans("ejnqrwxdsyftamcivbkulopghzEJNQRWXDSYFTAMCIVBKULOPGHZ",
>                             "0111222333445566677788899901112223334455666777888999");
> 
>     size_t line_start;
>     char[][][char[]] gdict;
>     auto input_dict = cast(char[])std.file.read("dictionary.txt");
> 
>     foreach (current_pos, c; input_dict)
>         if (c == '\n') { // words with DOS newlines too
>             auto word = input_dict[line_start .. current_pos].strip();
>             // word isn't a string, it's just a reference (start-end index) to
>             //   the input_dict string, despite being stripped.
>             gdict[word.translate(gtable, "\"")] ~= word;
>             line_start = current_pos+1;
>         }
>     auto word = input_dict[line_start .. input_dict.length].strip();
>     if (word.length > 0)
>         gdict[word.translate(gtable, "\"")] ~= word;
> 
>     foreach(char[] n; new BufferedFile("input.txt"))
>         traduct(n, n.removechars("/-"), 0, [], gdict);
> }
> 
> 
> The alternative version without ; and braces may look unusual for C programmers:
> 
> 
> import std.stdio, std.stream, std.string, std.ctype, std.gc
> 
> void traduct(char[] n, char[] digits, int start, char[][] words, char[][][char[]] gdict):
>     if (start >= digits.length):
>         writefln(n, ": ", words.join(" "))
>     else:
>         auto found_word = false
>         foreach(i; range(start, digits.length)):
>             if (digits[start .. i+1] in gdict):
>                 found_word = true
>                 foreach(hit; gdict[digits[start .. i+1]]):
>                     traduct(n, digits, i+1, words ~ [hit], gdict)
>         if (!found_word && (!words || (words && !std.ctype.isdigit(words[words.length-1][0])))):
>             traduct(n, digits, start+1, words ~ [digits[start..start+1]], gdict)
> 
> void main():
>     std.gc.disable()
>     auto gtable = maketrans("ejnqrwxdsyftamcivbkulopghzEJNQRWXDSYFTAMCIVBKULOPGHZ",
>                             "0111222333445566677788899901112223334455666777888999")
> 
>     char[][][char[]] gdict
>     foreach(char[] w; new BufferedFile("dictionary.txt")):
>         gdict[w.translate(gtable, "\"")] ~= w.dup
> 
>     foreach(char[] n; new BufferedFile("input.txt")):
>         traduct(n, n.removechars("/-"), 0, [], gdict)
> 

I like the version without ; but how can you tell where a block ends without braces? indents?