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word count: state enum is removed

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This commit is contained in:
Dmitry Kokorin 2016-02-22 00:33:18 +03:00
parent fb546d1f29
commit 6f5bbd1460
1 changed files with 16 additions and 38 deletions
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54
cpp/word-count/word_count.cpp
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@ -12,58 +12,36 @@ Words words(const string &str, const locale &loc)
{ {
Words result; Words result;
enum {
InsideWord,
OutsideWord
} state(OutsideWord);
string::const_iterator begin, end, i; string::const_iterator begin, end, i;
i = begin = end = str.begin(); i = end = str.begin();
begin = str.end();
for (; i != str.end(); ++i) { for (; i != str.end(); ++i) {
bool is_alpha_or_digit = isalpha(*i, loc) || isdigit(*i, loc); bool is_alpha_or_digit = isalpha(*i, loc) || isdigit(*i, loc);
bool is_word_char = is_alpha_or_digit || *i == '\''; bool is_word_char = is_alpha_or_digit || *i == '\'';
switch (state) { if (is_alpha_or_digit) {
case OutsideWord: if (begin > end)
begin = i;
if (is_alpha_or_digit) { end = next(i);
}
state = InsideWord; if (!is_word_char || next(i) == str.end()) {
begin = i;
end = next(i);
}
break; if (begin < end) {
case InsideWord: string word;
word.reserve(distance(begin, end));
transform(begin, end, back_inserter(word),
[=](char c){return tolower(c, loc);});
if (is_alpha_or_digit) { result[word]++;
end = next(i); begin = str.end();
} }
if (!is_word_char || next(i) == str.end()) {
state = OutsideWord;
if (begin != end) {
string word;
word.reserve(distance(begin, end));
transform(begin, end, back_inserter(word),
[=](char c){return tolower(c, loc);});
result[word]++;
}
}
break;
} }
} }