diff options
Diffstat (limited to 'absl/strings/substitute.h')
-rw-r--r-- | absl/strings/substitute.h | 91 |
1 files changed, 53 insertions, 38 deletions
diff --git a/absl/strings/substitute.h b/absl/strings/substitute.h index 43d73ad7..3ba7f4d3 100644 --- a/absl/strings/substitute.h +++ b/absl/strings/substitute.h @@ -5,7 +5,7 @@ // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // -// http://www.apache.org/licenses/LICENSE-2.0 +// https://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, @@ -35,19 +35,21 @@ // and single digit positional ids to indicate which substitution arguments to // use at that location within the format string. // +// A '$$' sequence in the format string causes a literal '$' character to be +// output. +// // Example 1: -// string s = Substitute("$1 purchased $0 $2. Thanks $1!", -// 5, "Bob", "Apples"); -// EXPECT_EQ("Bob purchased 5 Apples. Thanks Bob!", s); +// std::string s = Substitute("$1 purchased $0 $2 for $$10. Thanks $1!", +// 5, "Bob", "Apples"); +// EXPECT_EQ("Bob purchased 5 Apples for $10. Thanks Bob!", s); // // Example 2: -// string s = "Hi. "; +// std::string s = "Hi. "; // SubstituteAndAppend(&s, "My name is $0 and I am $1 years old.", "Bob", 5); // EXPECT_EQ("Hi. My name is Bob and I am 5 years old.", s); // -// // Supported types: -// * absl::string_view, string, const char* (null is equivalent to "") +// * absl::string_view, std::string, const char* (null is equivalent to "") // * int32_t, int64_t, uint32_t, uint64 // * float, double // * bool (Printed as "true" or "false") @@ -70,6 +72,8 @@ #include <cstring> #include <string> +#include <type_traits> +#include <vector> #include "absl/base/macros.h" #include "absl/base/port.h" @@ -82,7 +86,7 @@ #include "absl/strings/strip.h" namespace absl { -inline namespace lts_2018_12_18 { +inline namespace lts_2019_08_08 { namespace substitute_internal { // Arg @@ -153,6 +157,17 @@ class Arg { Arg(Hex hex); // NOLINT(runtime/explicit) Arg(Dec dec); // NOLINT(runtime/explicit) + // vector<bool>::reference and const_reference require special help to + // convert to `AlphaNum` because it requires two user defined conversions. + template <typename T, + absl::enable_if_t< + std::is_class<T>::value && + (std::is_same<T, std::vector<bool>::reference>::value || + std::is_same<T, std::vector<bool>::const_reference>::value)>* = + nullptr> + Arg(T value) // NOLINT(google-explicit-constructor) + : Arg(static_cast<bool>(value)) {} + // `void*` values, with the exception of `char*`, are printed as // "0x<hex value>". However, in the case of `nullptr`, "NULL" is printed. Arg(const void* value); // NOLINT(runtime/explicit) @@ -457,7 +472,7 @@ void SubstituteAndAppend( // Example: // template <typename... Args> // void VarMsg(absl::string_view format, const Args&... args) { -// string s = absl::Substitute(format, args...); +// std::string s = absl::Substitute(format, args...); ABSL_MUST_USE_RESULT inline std::string Substitute(absl::string_view format) { std::string result; @@ -575,70 +590,70 @@ std::string Substitute(const char* format, const substitute_internal::Arg& a0) "contains one of $1-$9"); std::string Substitute(const char* format, const substitute_internal::Arg& a0, - const substitute_internal::Arg& a1) + const substitute_internal::Arg& a1) ABSL_BAD_CALL_IF(substitute_internal::PlaceholderBitmask(format) != 3, "There were 2 substitution arguments given, but " "this format std::string is either missing its $0/$1, or " "contains one of $2-$9"); std::string Substitute(const char* format, const substitute_internal::Arg& a0, - const substitute_internal::Arg& a1, - const substitute_internal::Arg& a2) + const substitute_internal::Arg& a1, + const substitute_internal::Arg& a2) ABSL_BAD_CALL_IF(substitute_internal::PlaceholderBitmask(format) != 7, "There were 3 substitution arguments given, but " "this format std::string is either missing its $0/$1/$2, or " "contains one of $3-$9"); std::string Substitute(const char* format, const substitute_internal::Arg& a0, - const substitute_internal::Arg& a1, - const substitute_internal::Arg& a2, - const substitute_internal::Arg& a3) + const substitute_internal::Arg& a1, + const substitute_internal::Arg& a2, + const substitute_internal::Arg& a3) ABSL_BAD_CALL_IF(substitute_internal::PlaceholderBitmask(format) != 15, "There were 4 substitution arguments given, but " "this format std::string is either missing its $0-$3, or " "contains one of $4-$9"); std::string Substitute(const char* format, const substitute_internal::Arg& a0, - const substitute_internal::Arg& a1, - const substitute_internal::Arg& a2, - const substitute_internal::Arg& a3, - const substitute_internal::Arg& a4) + const substitute_internal::Arg& a1, + const substitute_internal::Arg& a2, + const substitute_internal::Arg& a3, + const substitute_internal::Arg& a4) ABSL_BAD_CALL_IF(substitute_internal::PlaceholderBitmask(format) != 31, "There were 5 substitution arguments given, but " "this format std::string is either missing its $0-$4, or " "contains one of $5-$9"); std::string Substitute(const char* format, const substitute_internal::Arg& a0, - const substitute_internal::Arg& a1, - const substitute_internal::Arg& a2, - const substitute_internal::Arg& a3, - const substitute_internal::Arg& a4, - const substitute_internal::Arg& a5) + const substitute_internal::Arg& a1, + const substitute_internal::Arg& a2, + const substitute_internal::Arg& a3, + const substitute_internal::Arg& a4, + const substitute_internal::Arg& a5) ABSL_BAD_CALL_IF(substitute_internal::PlaceholderBitmask(format) != 63, "There were 6 substitution arguments given, but " "this format std::string is either missing its $0-$5, or " "contains one of $6-$9"); std::string Substitute(const char* format, const substitute_internal::Arg& a0, - const substitute_internal::Arg& a1, - const substitute_internal::Arg& a2, - const substitute_internal::Arg& a3, - const substitute_internal::Arg& a4, - const substitute_internal::Arg& a5, - const substitute_internal::Arg& a6) + const substitute_internal::Arg& a1, + const substitute_internal::Arg& a2, + const substitute_internal::Arg& a3, + const substitute_internal::Arg& a4, + const substitute_internal::Arg& a5, + const substitute_internal::Arg& a6) ABSL_BAD_CALL_IF(substitute_internal::PlaceholderBitmask(format) != 127, "There were 7 substitution arguments given, but " "this format std::string is either missing its $0-$6, or " "contains one of $7-$9"); std::string Substitute(const char* format, const substitute_internal::Arg& a0, - const substitute_internal::Arg& a1, - const substitute_internal::Arg& a2, - const substitute_internal::Arg& a3, - const substitute_internal::Arg& a4, - const substitute_internal::Arg& a5, - const substitute_internal::Arg& a6, - const substitute_internal::Arg& a7) + const substitute_internal::Arg& a1, + const substitute_internal::Arg& a2, + const substitute_internal::Arg& a3, + const substitute_internal::Arg& a4, + const substitute_internal::Arg& a5, + const substitute_internal::Arg& a6, + const substitute_internal::Arg& a7) ABSL_BAD_CALL_IF(substitute_internal::PlaceholderBitmask(format) != 255, "There were 8 substitution arguments given, but " "this format std::string is either missing its $0-$7, or " @@ -667,7 +682,7 @@ std::string Substitute( "format std::string doesn't contain all of $0 through $9"); #endif // ABSL_BAD_CALL_IF -} // inline namespace lts_2018_12_18 +} // inline namespace lts_2019_08_08 } // namespace absl #endif // ABSL_STRINGS_SUBSTITUTE_H_ |