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url_ch If c is any other value, the function returns true Now the hard part begins: implementing url_beg This function is messy, because it must deal with the possibility that the input might contain :// in a context that cannot be a valid URL In practice, we'd probably have a list of acceptable protocol-names and look only for those For simplicity, though, we'll limit ourselves to being sure that one or more letters precede the :// separator, and at least one character follows it:
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string::const_iterator url_beg(string::const_iterator b, string::const_iterator e) { static const string sep = "://"; typedef string::const_iterator iter; // i marks where the separator was found iter i = b; while ((i = search(i, e, sepbegin(), sepend())) != e) { // make sure the separator isn't at the beginning or end of the line if (i != b // beg marks the beginning of the protocol-name iter beg = i; while (beg != b --beg; // is there at least one appropriate character before and after the separator if (beg != i } // the separator we found wasn't part of a URL advance i past this separator i += sepsize(); } return e; } return beg;
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The easy part is to write the function header We know that we'll be passed two iterators denoting the range in which to look, and that we'll return an iterator that denotes the beginning of the first URL in that range, if one exists We also declare and initialize a local string, which will hold the characters that make up the separator that identifies a potential URL Like url_ch in the not_url_char function ( 613/107), this string is static and const Thus, we will not be able to change the string, and its value will be created only on the first invocation of url_beg The function executes by placing two iterators into the string delimited by b and e:
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The iterator iwill denote the beginning of the URL separator, if any, and beg will indicate the beginning of the protocol-name, if any The function first looks for the separator, by calling search, a library function that we haven't used before This function takes two pairs of iterators: The first pair denotes the sequence in which we are looking, and the second pair denotes the sequence that we wish to locate As with other library functions, if search fails, it returns the second
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iterator Therefore, after the call to search, either i denotes (one past) the end of the input string, or it denotes a : that is followed by // If we found a separator, the next task is to get the letters (if any) that make up the protocol-name We first check whether the separator is at the beginning or end of the input If the separator is in either of those places, we know that we don't have a URL, because a URL has at least one character on each side of its separator Otherwise, we need to try to position the iterator beg The inner while loop moves beg backward through the input until it hits either a nonalphabetic character or the beginning of the string It uses two new ideas: The first is the notion that if a container supports indexing, so do its iterators In other words, beg[-1] is the character at the position immediately before the one that beg denotes We can think of beg[-l] as an abbreviation for *(beg - 1) We'll learn more about such iterators in 826/148 The second new idea is the isalpha function, defined in <cctype>, which tests whether its argument is a letter If we were able to advance the iterator over as much as a single character, we assume that we've found a protocol-name Before returning beg, we still have to check that there's at least one valid character following the separator This test is more complicated We know that there is at least one more character in the input, because we're inside the body of an if that compares the value of i + sepsize() with e We can access the first such character as i[sepsize()], which is an abbreviation for *(i + sepsize()) We test whether that character can appear in a URL by passing the character to not_url_char This function returns true if the character is not valid, so we negate the return to check whether the character is valid If the separator is not part of a URL, then the function advances i past the separator and keeps looking This code uses the decrement operator, which we mentioned in the operator table in 27/32, but which we have not previously used It works like the increment operator, but it decrements its operand instead As with the increment operator, it comes in prefix and postfix versions The prefix version, which we use here, decrements its operand and returns the new value
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