DocFormatHelper.cc

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#include "FWCore/ParameterSet/interface/DocFormatHelper.h"

#include <ostream>
#include <iomanip>

namespace edm {

  namespace {
    void wrapAndPrintLine(std::ostream& os, std::string const& text, size_t indent, size_t suggestedWidth) {

      char oldFill = os.fill();

      size_t length = text.size();

      // The position in the text where we start printing the next line
      size_t startLine = 0U;

      // The position in the text where we start looking for the next blank space
      size_t startNextSearch = 0U;

      // Loop over spaces in the text
      while (true) {

        // If the rest of the text fits on the current line,
        // then print it and we are done
        if ((length - startLine) <= suggestedWidth) {
          os << std::setfill(' ') << std::setw(indent) << "";
          if (startLine == 0) os << text;
          else os << text.substr(startLine);
          os << "\n";
          break;
        }

        // Look for next space
        size_t pos = text.find_first_of(' ', startNextSearch);

        // No more spaces
        if (pos == std::string::npos) {
          // The rest of the comment cannot fit in the width or we
          // would have already printed it.  Break the line at the
          // end of the previous word if there is one and print the
          // first part.  Then print the rest whether it fits or not.
          if (startNextSearch != startLine) {
            os << std::setfill(' ') << std::setw(indent) << "";
            os << text.substr(startLine, startNextSearch - startLine);
            os << "\n";
            startLine = startNextSearch;
          }
          os << std::setfill(' ') << std::setw(indent) << "";
          os << text.substr(startLine);
          os << "\n";
          break;
        }

        if ((pos + 1U - startLine) > suggestedWidth) {

          // With this word the line is too long.  Print out to
          // the end of the previous word if there was one.
          // If there was not, then print to the end of this word
          // even though it exceeds the width.
          if (startNextSearch != startLine) {
            os << std::setfill(' ') << std::setw(indent) << "";
            os << text.substr(startLine, startNextSearch - startLine);
            os << "\n";
            startLine = startNextSearch;
          }
          if ((pos + 1U - startLine) > suggestedWidth) {
            os << std::setfill(' ') << std::setw(indent) << "";
            os << text.substr(startLine, pos + 1U - startLine);
            os << "\n";
            startLine = pos + 1U;
          }
        }
        startNextSearch = pos + 1U;
      }
      os.fill(oldFill);
    }
  }

  // Print and wrap text to an output stream.
  // This function looks for new line chars in the text,
  // and calls wrapAndPrintLine() to output each line,
  // which wraps appropriately.  That function
  // inserts new lines to try to break the text to fit into
  // the suggested width.  At the beginning and after every
  // inserted newline this will print "indent" blank spaces.
  // The function will consider inserting a new line after
  // every blank space.  If the text to the next blank
  // space will exceed the "suggestedWidth" it inserts a
  // new line.  If the text between two blank spaces (a "word")
  // is longer than the suggested width, then it prints the whole
  // word anyway (exceeding the "suggestedWidth" for lines).
  // The output will look nice if the input has words separated
  // by a single blank space with no extra space in the input text,
  // otherwise the extra spaces and newlines get printed
  // making the output not nicely formatted ...
  void DocFormatHelper::wrapAndPrintText(std::ostream& os,
                                         std::string const& text,
                                         size_t indent,
                                         size_t suggestedWidth) {

    size_t pos = text.find_first_of('\n');
    if (pos == std::string::npos) {
      // no embedded newlines
      wrapAndPrintLine(os, text, indent, suggestedWidth);
    } else {
      // print the first line.
      wrapAndPrintLine(os, text.substr(0, pos), indent, suggestedWidth);
      // print all lines after the first.
      wrapAndPrintText(os, text.substr(pos + 1), indent, suggestedWidth);
    }
  }

  void DocFormatHelper::init() {
    section_ = std::string();
    pass_ = 0;
    column1_ = 0;
    column2_ = 0;
    column3_ = 0;
    counter_ = 0;
    parent_ = OTHER;
  }

  size_t DocFormatHelper::commentWidth() const {

    // Make the length of a comment at least 30 characters
    // per line, longer if there is more space available
    size_t width = 30U;
    if (lineWidth() > startColumn2() + 30U) {
      width = lineWidth() - startColumn2();
    }
    return width;
  }

  void DocFormatHelper::indent(std::ostream& os) const {
    char oldFill = os.fill();
    os << std::setfill(' ') << std::setw(indentation_) << "";
    os.fill(oldFill);
  }

  void DocFormatHelper::indent2(std::ostream& os) const {
    char oldFill = os.fill();
    os << std::setfill(' ') << std::setw(startColumn2_) << "";
    os.fill(oldFill);
  }
}