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[base] Convert Starts/Ends/Equals string functions to string_view 

Test: UTs

Change-Id: I3751656d44e7a814488169c53d3e8af0da44f262
This commit is contained in:
Yurii Zubrytskyi 2019-03-19 17:03:42 -07:00
parent c3e96512c0
commit 59d876c7a2
2 changed files with 22 additions and 53 deletions
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20
base/include/android-base/strings.h
View File

@ -56,23 +56,17 @@ extern template std::string Join(const std::vector<std::string>&, const std::str
extern template std::string Join(const std::vector<const char*>&, const std::string&);
// Tests whether 's' starts with 'prefix'.
// TODO: string_view
bool StartsWith(const std::string& s, const char* prefix);
bool StartsWithIgnoreCase(const std::string& s, const char* prefix);
bool StartsWith(const std::string& s, const std::string& prefix);
bool StartsWithIgnoreCase(const std::string& s, const std::string& prefix);
bool StartsWith(const std::string& s, char prefix);
bool StartsWith(std::string_view s, std::string_view prefix);
bool StartsWith(std::string_view s, char prefix);
bool StartsWithIgnoreCase(std::string_view s, std::string_view prefix);
// Tests whether 's' ends with 'suffix'.
// TODO: string_view
bool EndsWith(const std::string& s, const char* suffix);
bool EndsWithIgnoreCase(const std::string& s, const char* suffix);
bool EndsWith(const std::string& s, const std::string& suffix);
bool EndsWithIgnoreCase(const std::string& s, const std::string& suffix);
bool EndsWith(const std::string& s, char suffix);
bool EndsWith(std::string_view s, std::string_view suffix);
bool EndsWith(std::string_view s, char suffix);
bool EndsWithIgnoreCase(std::string_view s, std::string_view suffix);
// Tests whether 'lhs' equals 'rhs', ignoring case.
bool EqualsIgnoreCase(const std::string& lhs, const std::string& rhs);
bool EqualsIgnoreCase(std::string_view lhs, std::string_view rhs);
} // namespace base
} // namespace android

55
base/strings.cpp
View File

@ -87,58 +87,33 @@ template std::string Join(const std::vector<const char*>&, char);
template std::string Join(const std::vector<std::string>&, const std::string&);
template std::string Join(const std::vector<const char*>&, const std::string&);
bool StartsWith(const std::string& s, const char* prefix) {
return strncmp(s.c_str(), prefix, strlen(prefix)) == 0;
bool StartsWith(std::string_view s, std::string_view prefix) {
return s.substr(0, prefix.size()) == prefix;
}
bool StartsWith(const std::string& s, const std::string& prefix) {
return strncmp(s.c_str(), prefix.c_str(), prefix.size()) == 0;
bool StartsWith(std::string_view s, char prefix) {
return !s.empty() && s.front() == prefix;
}
bool StartsWith(const std::string& s, char prefix) {
return *s.c_str() == prefix; // Use c_str() to guarantee there is at least a '\0'.
bool StartsWithIgnoreCase(std::string_view s, std::string_view prefix) {
return s.size() >= prefix.size() && strncasecmp(s.data(), prefix.data(), prefix.size()) == 0;
}
bool StartsWithIgnoreCase(const std::string& s, const char* prefix) {
return strncasecmp(s.c_str(), prefix, strlen(prefix)) == 0;
bool EndsWith(std::string_view s, std::string_view suffix) {
return s.size() >= suffix.size() && s.substr(s.size() - suffix.size(), suffix.size()) == suffix;
}
bool StartsWithIgnoreCase(const std::string& s, const std::string& prefix) {
return strncasecmp(s.c_str(), prefix.c_str(), prefix.size()) == 0;
bool EndsWith(std::string_view s, char suffix) {
return !s.empty() && s.back() == suffix;
}
static bool EndsWith(const std::string& s, const char* suffix, size_t suffix_length,
bool case_sensitive) {
size_t string_length = s.size();
if (suffix_length > string_length) {
return false;
}
size_t offset = string_length - suffix_length;
return (case_sensitive ? strncmp : strncasecmp)(s.c_str() + offset, suffix, suffix_length) == 0;
bool EndsWithIgnoreCase(std::string_view s, std::string_view suffix) {
return s.size() >= suffix.size() &&
strncasecmp(s.data() + (s.size() - suffix.size()), suffix.data(), suffix.size()) == 0;
}
bool EndsWith(const std::string& s, const char* suffix) {
return EndsWith(s, suffix, strlen(suffix), true);
}
bool EndsWith(const std::string& s, const std::string& suffix) {
return EndsWith(s, suffix.c_str(), suffix.size(), true);
}
bool EndsWith(const std::string& s, char suffix) {
return EndsWith(s, &suffix, 1, true);
}
bool EndsWithIgnoreCase(const std::string& s, const char* suffix) {
return EndsWith(s, suffix, strlen(suffix), false);
}
bool EndsWithIgnoreCase(const std::string& s, const std::string& suffix) {
return EndsWith(s, suffix.c_str(), suffix.size(), false);
}
bool EqualsIgnoreCase(const std::string& lhs, const std::string& rhs) {
return strcasecmp(lhs.c_str(), rhs.c_str()) == 0;
bool EqualsIgnoreCase(std::string_view lhs, std::string_view rhs) {
return lhs.size() == rhs.size() && strncasecmp(lhs.data(), rhs.data(), lhs.size()) == 0;
}
} // namespace base