/*
- * Copyright 2012 Facebook, Inc.
+ * Copyright 2013 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
#ifndef FOLLY_BASE_STRING_H_
#define FOLLY_BASE_STRING_H_
+#include <exception>
#include <string>
#include <boost/type_traits.hpp>
return out;
}
+/**
+ * URI-escape a string. Appends the result to the output string.
+ *
+ * Alphanumeric characters and other characters marked as "unreserved" in RFC
+ * 3986 ( -_.~ ) are left unchanged. In PATH mode, the forward slash (/) is
+ * also left unchanged. In QUERY mode, spaces are replaced by '+'. All other
+ * characters are percent-encoded.
+ */
+enum class UriEscapeMode : unsigned char {
+ // The values are meaningful, see generate_escape_tables.py
+ ALL = 0,
+ QUERY = 1,
+ PATH = 2
+};
+template <class String>
+void uriEscape(StringPiece str,
+ String& out,
+ UriEscapeMode mode = UriEscapeMode::ALL);
+
+/**
+ * Similar to uriEscape above, but returns the escaped string.
+ */
+template <class String>
+String uriEscape(StringPiece str, UriEscapeMode mode = UriEscapeMode::ALL) {
+ String out;
+ uriEscape(str, out, mode);
+ return out;
+}
+
+/**
+ * URI-unescape a string. Appends the result to the output string.
+ *
+ * In QUERY mode, '+' are replaced by space. %XX sequences are decoded if
+ * XX is a valid hex sequence, otherwise we throw invalid_argument.
+ */
+template <class String>
+void uriUnescape(StringPiece str,
+ String& out,
+ UriEscapeMode mode = UriEscapeMode::ALL);
+
+/**
+ * Similar to uriUnescape above, but returns the unescaped string.
+ */
+template <class String>
+String uriUnescape(StringPiece str, UriEscapeMode mode = UriEscapeMode::ALL) {
+ String out;
+ uriUnescape(str, out, mode);
+ return out;
+}
+
/**
* stringPrintf is much like printf but deposits its result into a
* string. Two signatures are supported: the first simply returns the
return folly::to<fbstring>(demangle(typeid(e)), ": ", e.what());
}
+inline fbstring exceptionStr(std::exception_ptr ep) {
+ try {
+ std::rethrow_exception(ep);
+ } catch (const std::exception& e) {
+ return exceptionStr(e);
+ } catch (...) {
+ return "<unknown exception>";
+ }
+}
+
/*
* Split a string into a list of tokens by delimiter.
*
OutputIterator out,
bool ignoreEmpty = false);
+/*
+ * Split a string into a fixed number of pieces by delimiter. Returns 'true' if
+ * the fields were all successfully populated.
+ *
+ * Example:
+ *
+ * folly::StringPiece name, key, value;
+ * if (folly::split('\t', line, name, key, value))
+ * ...
+ *
+ * The 'exact' template paremeter specifies how the function behaves when too
+ * many fields are present in the input string. When 'exact' is set to its
+ * default value of 'true', a call to split will fail if the number of fields in
+ * the input string does not exactly match the number of output parameters
+ * passed. If 'exact' is overridden to 'false', all remaining fields will be
+ * stored, unsplit, in the last field, as shown below:
+ *
+ * folly::StringPiece x, y.
+ * if (folly::split<false>(':', "a:b:c", x, y))
+ * assert(x == "a" && y == "b:c");
+ */
+template<bool exact = true,
+ class Delim,
+ class... StringPieces>
+bool split(const Delim& delimiter,
+ StringPiece input,
+ StringPiece& outHead,
+ StringPieces&... outTail);
+
+/*
+ * Join list of tokens.
+ *
+ * Stores a string representation of tokens in the same order with
+ * deliminer between each element.
+ */
+
+template <class Delim, class Iterator, class String>
+void join(const Delim& delimiter,
+ Iterator begin,
+ Iterator end,
+ String& output);
+
+template <class Delim, class Container, class String>
+void join(const Delim& delimiter,
+ const Container& container,
+ String& output) {
+ join(delimiter, container.begin(), container.end(), output);
+}
+
+template <class Delim, class Container>
+std::string join(const Delim& delimiter,
+ const Container& container) {
+ std::string output;
+ join(delimiter, container.begin(), container.end(), output);
+ return output;
+}
+
} // namespace folly
// Hash functions for string and fbstring usable with e.g. hash_map