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Diffstat (limited to 'src/google/protobuf/io/printer.cc')
| -rw-r--r-- | src/google/protobuf/io/printer.cc | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/src/google/protobuf/io/printer.cc b/src/google/protobuf/io/printer.cc new file mode 100644 index 0000000..937d777 --- /dev/null +++ b/src/google/protobuf/io/printer.cc @@ -0,0 +1,179 @@ +// Protocol Buffers - Google's data interchange format +// Copyright 2008 Google Inc. All rights reserved. +// http://code.google.com/p/protobuf/ +// +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions are +// met: +// +// * Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// * Redistributions in binary form must reproduce the above +// copyright notice, this list of conditions and the following disclaimer +// in the documentation and/or other materials provided with the +// distribution. +// * Neither the name of Google Inc. nor the names of its +// contributors may be used to endorse or promote products derived from +// this software without specific prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +// Author: kenton@google.com (Kenton Varda) +// Based on original Protocol Buffers design by +// Sanjay Ghemawat, Jeff Dean, and others. + +#include <google/protobuf/io/printer.h> +#include <google/protobuf/io/zero_copy_stream.h> +#include <google/protobuf/stubs/common.h> +#include <google/protobuf/stubs/strutil.h> + +namespace google { +namespace protobuf { +namespace io { + +Printer::Printer(ZeroCopyOutputStream* output, char variable_delimiter) + : variable_delimiter_(variable_delimiter), + output_(output), + buffer_(NULL), + buffer_size_(0), + at_start_of_line_(true), + failed_(false) { +} + +Printer::~Printer() { + // Only BackUp() if we're sure we've successfully called Next() at least once. + if (buffer_size_ > 0) { + output_->BackUp(buffer_size_); + } +} + +void Printer::Print(const map<string, string>& variables, const char* text) { + int size = strlen(text); + int pos = 0; // The number of bytes we've written so far. + + for (int i = 0; i < size; i++) { + if (text[i] == '\n') { + // Saw newline. If there is more text, we may need to insert an indent + // here. So, write what we have so far, including the '\n'. + Write(text + pos, i - pos + 1); + pos = i + 1; + + // Setting this true will cause the next Write() to insert an indent + // first. + at_start_of_line_ = true; + + } else if (text[i] == variable_delimiter_) { + // Saw the start of a variable name. + + // Write what we have so far. + Write(text + pos, i - pos); + pos = i + 1; + + // Find closing delimiter. + const char* end = strchr(text + pos, variable_delimiter_); + if (end == NULL) { + GOOGLE_LOG(DFATAL) << " Unclosed variable name."; + end = text + pos; + } + int endpos = end - text; + + string varname(text + pos, endpos - pos); + if (varname.empty()) { + // Two delimiters in a row reduce to a literal delimiter character. + Write(&variable_delimiter_, 1); + } else { + // Replace with the variable's value. + map<string, string>::const_iterator iter = variables.find(varname); + if (iter == variables.end()) { + GOOGLE_LOG(DFATAL) << " Undefined variable: " << varname; + } else { + Write(iter->second.data(), iter->second.size()); + } + } + + // Advance past this variable. + i = endpos; + pos = endpos + 1; + } + } + + // Write the rest. + Write(text + pos, size - pos); +} + +void Printer::Print(const char* text) { + static map<string, string> empty; + Print(empty, text); +} + +void Printer::Print(const char* text, + const char* variable, const string& value) { + map<string, string> vars; + vars[variable] = value; + Print(vars, text); +} + +void Printer::Print(const char* text, + const char* variable1, const string& value1, + const char* variable2, const string& value2) { + map<string, string> vars; + vars[variable1] = value1; + vars[variable2] = value2; + Print(vars, text); +} + +void Printer::Indent() { + indent_ += " "; +} + +void Printer::Outdent() { + if (indent_.empty()) { + GOOGLE_LOG(DFATAL) << " Outdent() without matching Indent()."; + return; + } + + indent_.resize(indent_.size() - 2); +} + +void Printer::Write(const char* data, int size) { + if (failed_) return; + if (size == 0) return; + + if (at_start_of_line_) { + // Insert an indent. + at_start_of_line_ = false; + Write(indent_.data(), indent_.size()); + if (failed_) return; + } + + while (size > buffer_size_) { + // Data exceeds space in the buffer. Copy what we can and request a + // new buffer. + memcpy(buffer_, data, buffer_size_); + data += buffer_size_; + size -= buffer_size_; + void* void_buffer; + failed_ = !output_->Next(&void_buffer, &buffer_size_); + if (failed_) return; + buffer_ = reinterpret_cast<char*>(void_buffer); + } + + // Buffer is big enough to receive the data; copy it. + memcpy(buffer_, data, size); + buffer_ += size; + buffer_size_ -= size; +} + +} // namespace io +} // namespace protobuf +} // namespace google |