text: // 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
  