On 2009-05-14 11:06:44 -0400, Andrei Alexandrescu
<[email protected]> said:
auto before = str[0 .. find(str, something)];
Hum, wouldn't this be more intuitive:
auto before = str.before(str.find(something));
That could work by having "find" return a range over the searched
string. At first glance having find(str, "def") returning "def" sounds
silly and unhelpful, but since the returned "def" is a range over the
original, you can do a lot of interesting things with it, such as:
auto str = "abcdefghi";
auto strSlice = str.find("def"); // strSlice == "def"
auto strBefore = str.before(slice); // strBefore == "abc"
auto strAfter = str.after(slice); // strAfter == "ghi"
An interesting thing is that it makes a lot of sense with a regex
argument in find:
auto str = "abcdefghi";
auto strSlice = str.find(regex("c.*g")); // strSlice = "cdefg"
auto strBefore = str.before(strSlice); // strBefore = "ab"
auto strAfter = str.after(strSlice); // strAfter = "hi"
And you can modify the result in place:
auto str = "hello world";
str.find("world")[] = "range";
assert(str == "hello range");
... although that's somewhat limited since slice[] = x can't change the
number of characters in the slice.
The "not found" result would be the end of the string: str[$..$].
Getting the position of the found string would be done like this:
auto str = "abcdefhij";
auto pos = str.before(str.find("def)).length; // pos == 3
But I guess having "findPos" or "indexOf" for that would be more readable.
--
Michel Fortin
[email protected]
http://michelf.com/
