/*
- * Copyright 2014 Facebook, Inc.
+ * Copyright 2015 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
#define FOLLY_BASE_STRING_H_
#include <exception>
+#include <stdarg.h>
#include <string>
#include <boost/type_traits.hpp>
FOLLY_PRINTF_FORMAT const char* format, ...)
FOLLY_PRINTF_FORMAT_ATTR(2, 3);
+/**
+ * Similar to stringPrintf, but accepts a va_list argument.
+ *
+ * As with vsnprintf() itself, the value of ap is undefined after the call.
+ * These functions do not call va_end() on ap.
+ */
+std::string stringVPrintf(const char* format, va_list ap);
+void stringVPrintf(std::string* out, const char* format, va_list ap);
+std::string& stringVAppendf(std::string* out, const char* format, va_list ap);
+
/**
* Backslashify a string, that is, replace non-printable characters
* with C-style (but NOT C compliant) "\xHH" encoding. If hex_style
fbstring errnoStr(int err);
/**
- * Debug string for an exception: include type and what().
+ * Debug string for an exception: include type and what(), if
+ * defined.
*/
inline fbstring exceptionStr(const std::exception& e) {
+#ifdef FOLLY_HAS_RTTI
return folly::to<fbstring>(demangle(typeid(e)), ": ", e.what());
+#else
+ return folly::to<fbstring>("Exception (no RTTI available): ", e.what());
+#endif
}
+// Empirically, this indicates if the runtime supports
+// std::exception_ptr, as not all (arm, for instance) do.
+#if defined(__GNUC__) && defined(__GCC_ATOMIC_INT_LOCK_FREE) && \
+ __GCC_ATOMIC_INT_LOCK_FREE > 1
inline fbstring exceptionStr(std::exception_ptr ep) {
try {
std::rethrow_exception(ep);
return "<unknown exception>";
}
}
+#endif
+
+template<typename E>
+auto exceptionStr(const E& e)
+ -> typename std::enable_if<!std::is_base_of<std::exception, E>::value,
+ fbstring>::type
+{
+#ifdef FOLLY_HAS_RTTI
+ return folly::to<fbstring>(demangle(typeid(e)));
+#else
+ return "Exception (no RTTI available)";
+#endif
+}
/*
* Split a string into a list of tokens by delimiter.
* Split a string into a fixed number of string pieces and/or numeric types
* by delimiter. Any numeric type that folly::to<> can convert to from a
* string piece is supported as a target. Returns 'true' if the fields were
- * all successfully populated.
+ * all successfully populated. Returns 'false' if there were too few fields
+ * in the input, or too many fields if exact=true. Casting exceptions will
+ * not be caught.
*
* Examples:
*
template <class T>
using IsSplitTargetType = std::integral_constant<bool,
std::is_arithmetic<T>::value ||
- std::is_same<T, StringPiece>::value>;
+ std::is_same<T, StringPiece>::value ||
+ IsSomeString<T>::value>;
template<bool exact = true,
class Delim,
return output;
}
+template <class Delim,
+ class Iterator,
+ typename std::enable_if<std::is_same<
+ typename std::iterator_traits<Iterator>::iterator_category,
+ std::random_access_iterator_tag>::value>::type* = nullptr>
+std::string join(const Delim& delimiter, Iterator begin, Iterator end) {
+ std::string output;
+ join(delimiter, begin, end, output);
+ return output;
+}
+
/**
* Returns a subpiece with all whitespace removed from the front of @sp.
* Whitespace means any of [' ', '\n', '\r', '\t'].
*/
-StringPiece skipWhitespace(StringPiece sp);
-
-} // namespace folly
+StringPiece ltrimWhitespace(StringPiece sp);
-// Hash functions to make std::string usable with e.g. hash_map
-//
-// Handle interaction with different C++ standard libraries, which
-// expect these types to be in different namespaces.
-namespace std {
-
-template <class C>
-struct hash<std::basic_string<C> > : private hash<const C*> {
- size_t operator()(const std::basic_string<C> & s) const {
- return hash<const C*>::operator()(s.c_str());
- }
-};
+/**
+ * Returns a subpiece with all whitespace removed from the back of @sp.
+ * Whitespace means any of [' ', '\n', '\r', '\t'].
+ */
+StringPiece rtrimWhitespace(StringPiece sp);
+/**
+ * Returns a subpiece with all whitespace removed from the back and front of @sp.
+ * Whitespace means any of [' ', '\n', '\r', '\t'].
+ */
+inline StringPiece trimWhitespace(StringPiece sp) {
+ return ltrimWhitespace(rtrimWhitespace(sp));
}
-#if FOLLY_HAVE_DEPRECATED_ASSOC
-#if defined(_GLIBCXX_SYMVER) && !defined(__BIONIC__)
-namespace __gnu_cxx {
+/**
+ * Returns a subpiece with all whitespace removed from the front of @sp.
+ * Whitespace means any of [' ', '\n', '\r', '\t'].
+ * DEPRECATED: @see ltrimWhitespace @see rtrimWhitespace
+ */
+inline StringPiece skipWhitespace(StringPiece sp) {
+ return ltrimWhitespace(sp);
+}
-template <class C>
-struct hash<std::basic_string<C> > : private hash<const C*> {
- size_t operator()(const std::basic_string<C> & s) const {
- return hash<const C*>::operator()(s.c_str());
- }
-};
+/**
+ * Fast, in-place lowercasing of ASCII alphabetic characters in strings.
+ * Leaves all other characters unchanged, including those with the 0x80
+ * bit set.
+ * @param str String to convert
+ * @param len Length of str, in bytes
+ */
+void toLowerAscii(char* str, size_t length);
+inline void toLowerAscii(MutableStringPiece str) {
+ toLowerAscii(str.begin(), str.size());
}
-#endif
-#endif
+
+} // namespace folly
// Hook into boost's type traits
namespace boost {
projects / folly.git / blobdiff