| // Copyright 2017 The Abseil Authors. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // 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, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #include "absl/strings/substitute.h" |
| |
| #include <algorithm> |
| |
| #include "absl/base/internal/raw_logging.h" |
| #include "absl/strings/ascii.h" |
| #include "absl/strings/escaping.h" |
| #include "absl/strings/internal/resize_uninitialized.h" |
| #include "absl/strings/string_view.h" |
| |
| namespace absl { |
| namespace substitute_internal { |
| |
| void SubstituteAndAppendArray(std::string* output, absl::string_view format, |
| const absl::string_view* args_array, |
| size_t num_args) { |
| // Determine total size needed. |
| size_t size = 0; |
| for (size_t i = 0; i < format.size(); i++) { |
| if (format[i] == '$') { |
| if (i + 1 >= format.size()) { |
| #ifndef NDEBUG |
| ABSL_RAW_LOG(FATAL, |
| "Invalid strings::Substitute() format std::string: \"%s\".", |
| absl::CEscape(format).c_str()); |
| #endif |
| return; |
| } else if (absl::ascii_isdigit(format[i + 1])) { |
| int index = format[i + 1] - '0'; |
| if (static_cast<size_t>(index) >= num_args) { |
| #ifndef NDEBUG |
| ABSL_RAW_LOG( |
| FATAL, |
| "Invalid strings::Substitute() format std::string: asked for \"$" |
| "%d\", but only %d args were given. Full format std::string was: " |
| "\"%s\".", |
| index, static_cast<int>(num_args), absl::CEscape(format).c_str()); |
| #endif |
| return; |
| } |
| size += args_array[index].size(); |
| ++i; // Skip next char. |
| } else if (format[i + 1] == '$') { |
| ++size; |
| ++i; // Skip next char. |
| } else { |
| #ifndef NDEBUG |
| ABSL_RAW_LOG(FATAL, |
| "Invalid strings::Substitute() format std::string: \"%s\".", |
| absl::CEscape(format).c_str()); |
| #endif |
| return; |
| } |
| } else { |
| ++size; |
| } |
| } |
| |
| if (size == 0) return; |
| |
| // Build the std::string. |
| size_t original_size = output->size(); |
| strings_internal::STLStringResizeUninitialized(output, original_size + size); |
| char* target = &(*output)[original_size]; |
| for (size_t i = 0; i < format.size(); i++) { |
| if (format[i] == '$') { |
| if (absl::ascii_isdigit(format[i + 1])) { |
| const absl::string_view src = args_array[format[i + 1] - '0']; |
| target = std::copy(src.begin(), src.end(), target); |
| ++i; // Skip next char. |
| } else if (format[i + 1] == '$') { |
| *target++ = '$'; |
| ++i; // Skip next char. |
| } |
| } else { |
| *target++ = format[i]; |
| } |
| } |
| |
| assert(target == output->data() + output->size()); |
| } |
| |
| static const char kHexDigits[] = "0123456789abcdef"; |
| Arg::Arg(const void* value) { |
| static_assert(sizeof(scratch_) >= sizeof(value) * 2 + 2, |
| "fix sizeof(scratch_)"); |
| if (value == nullptr) { |
| piece_ = "NULL"; |
| } else { |
| char* ptr = scratch_ + sizeof(scratch_); |
| uintptr_t num = reinterpret_cast<uintptr_t>(value); |
| do { |
| *--ptr = kHexDigits[num & 0xf]; |
| num >>= 4; |
| } while (num != 0); |
| *--ptr = 'x'; |
| *--ptr = '0'; |
| piece_ = absl::string_view(ptr, scratch_ + sizeof(scratch_) - ptr); |
| } |
| } |
| |
| // TODO(jorg): Don't duplicate so much code between here and str_cat.cc |
| Arg::Arg(Hex hex) { |
| char* const end = &scratch_[numbers_internal::kFastToBufferSize]; |
| char* writer = end; |
| uint64_t value = hex.value; |
| do { |
| *--writer = kHexDigits[value & 0xF]; |
| value >>= 4; |
| } while (value != 0); |
| |
| char* beg; |
| if (end - writer < hex.width) { |
| beg = end - hex.width; |
| std::fill_n(beg, writer - beg, hex.fill); |
| } else { |
| beg = writer; |
| } |
| |
| piece_ = absl::string_view(beg, end - beg); |
| } |
| |
| // TODO(jorg): Don't duplicate so much code between here and str_cat.cc |
| Arg::Arg(Dec dec) { |
| assert(dec.width <= numbers_internal::kFastToBufferSize); |
| char* const end = &scratch_[numbers_internal::kFastToBufferSize]; |
| char* const minfill = end - dec.width; |
| char* writer = end; |
| uint64_t value = dec.value; |
| bool neg = dec.neg; |
| while (value > 9) { |
| *--writer = '0' + (value % 10); |
| value /= 10; |
| } |
| *--writer = '0' + value; |
| if (neg) *--writer = '-'; |
| |
| ptrdiff_t fillers = writer - minfill; |
| if (fillers > 0) { |
| // Tricky: if the fill character is ' ', then it's <fill><+/-><digits> |
| // But...: if the fill character is '0', then it's <+/-><fill><digits> |
| bool add_sign_again = false; |
| if (neg && dec.fill == '0') { // If filling with '0', |
| ++writer; // ignore the sign we just added |
| add_sign_again = true; // and re-add the sign later. |
| } |
| writer -= fillers; |
| std::fill_n(writer, fillers, dec.fill); |
| if (add_sign_again) *--writer = '-'; |
| } |
| |
| piece_ = absl::string_view(writer, end - writer); |
| } |
| |
| } // namespace substitute_internal |
| } // namespace absl |