C++ Stream::GetIndentLevel方法代码示例

void Options::OutputFormattedUsageText(Stream &strm,
                                       const OptionDefinition &option_def,
                                       uint32_t output_max_columns) {
  std::string actual_text;
  if (option_def.validator) {
    const char *condition = option_def.validator->ShortConditionString();
    if (condition) {
      actual_text = "[";
      actual_text.append(condition);
      actual_text.append("] ");
    }
  }
  actual_text.append(option_def.usage_text);

  // Will it all fit on one line?

  if (static_cast<uint32_t>(actual_text.length() + strm.GetIndentLevel()) <
      output_max_columns) {
    // Output it as a single line.
    strm.Indent(actual_text.c_str());
    strm.EOL();
  } else {
    // We need to break it up into multiple lines.

    int text_width = output_max_columns - strm.GetIndentLevel() - 1;
    int start = 0;
    int end = start;
    int final_end = actual_text.length();
    int sub_len;

    while (end < final_end) {
      // Don't start the 'text' on a space, since we're already outputting the
      // indentation.
      while ((start < final_end) && (actual_text[start] == ' '))
        start++;

      end = start + text_width;
      if (end > final_end)
        end = final_end;
      else {
        // If we're not at the end of the text, make sure we break the line on
        // white space.
        while (end > start && actual_text[end] != ' ' &&
               actual_text[end] != '\t' && actual_text[end] != '\n')
          end--;
      }

      sub_len = end - start;
      if (start != 0)
        strm.EOL();
      strm.Indent();
      assert(start < final_end);
      assert(start + sub_len <= final_end);
      strm.Write(actual_text.c_str() + start, sub_len);
      start = end + 1;
    }
    strm.EOL();
  }
}

void
Options::OutputFormattedUsageText
(
    Stream &strm,
    const char *text,
    uint32_t output_max_columns
)
{
    int len = strlen (text);

    // Will it all fit on one line?

    if (static_cast<uint32_t>(len + strm.GetIndentLevel()) < output_max_columns)
    {
        // Output it as a single line.
        strm.Indent (text);
        strm.EOL();
    }
    else
    {
        // We need to break it up into multiple lines.

        int text_width = output_max_columns - strm.GetIndentLevel() - 1;
        int start = 0;
        int end = start;
        int final_end = strlen (text);
        int sub_len;

        while (end < final_end)
        {
            // Don't start the 'text' on a space, since we're already outputting the indentation.
            while ((start < final_end) && (text[start] == ' '))
                start++;

            end = start + text_width;
            if (end > final_end)
                end = final_end;
            else
            {
                // If we're not at the end of the text, make sure we break the line on white space.
                while (end > start
                       && text[end] != ' ' && text[end] != '\t' && text[end] != '\n')
                    end--;
            }

            sub_len = end - start;
            if (start != 0)
                strm.EOL();
            strm.Indent();
            assert (start < final_end);
            assert (start + sub_len <= final_end);
            strm.Write(text + start, sub_len);
            start = end + 1;
        }
        strm.EOL();
    }
}

void Options::GenerateOptionUsage(Stream &strm, CommandObject *cmd,
                                  uint32_t screen_width) {
  const bool only_print_args = cmd->IsDashDashCommand();

  auto opt_defs = GetDefinitions();
  const uint32_t save_indent_level = strm.GetIndentLevel();
  llvm::StringRef name;

  StreamString arguments_str;

  if (cmd) {
    name = cmd->GetCommandName();
    cmd->GetFormattedCommandArguments(arguments_str);
  } else
    name = "";

  strm.PutCString("\nCommand Options Usage:\n");

  strm.IndentMore(2);

  // First, show each usage level set of options, e.g. <cmd>
  // [options-for-level-0]
  //                                                   <cmd>
  //                                                   [options-for-level-1]
  //                                                   etc.

  const uint32_t num_options = NumCommandOptions();
  if (num_options == 0)
    return;

  uint32_t num_option_sets = GetRequiredOptions().size();

  uint32_t i;

  if (!only_print_args) {
    for (uint32_t opt_set = 0; opt_set < num_option_sets; ++opt_set) {
      uint32_t opt_set_mask;

      opt_set_mask = 1 << opt_set;
      if (opt_set > 0)
        strm.Printf("\n");
      strm.Indent(name);

      // Different option sets may require different args.
      StreamString args_str;
      if (cmd)
        cmd->GetFormattedCommandArguments(args_str, opt_set_mask);

      // First go through and print all options that take no arguments as
      // a single string. If a command has "-a" "-b" and "-c", this will show
      // up as [-abc]

      std::set<int> options;
      std::set<int>::const_iterator options_pos, options_end;
      for (auto &def : opt_defs) {
        if (def.usage_mask & opt_set_mask && isprint8(def.short_option)) {
          // Add current option to the end of out_stream.

          if (def.required && def.option_has_arg == OptionParser::eNoArgument) {
            options.insert(def.short_option);
          }
        }
      }

      if (options.empty() == false) {
        // We have some required options with no arguments
        strm.PutCString(" -");
        for (i = 0; i < 2; ++i)
          for (options_pos = options.begin(), options_end = options.end();
               options_pos != options_end; ++options_pos) {
            if (i == 0 && ::islower(*options_pos))
              continue;
            if (i == 1 && ::isupper(*options_pos))
              continue;
            strm << (char)*options_pos;
          }
      }

      options.clear();
      for (auto &def : opt_defs) {
        if (def.usage_mask & opt_set_mask && isprint8(def.short_option)) {
          // Add current option to the end of out_stream.

          if (def.required == false &&
              def.option_has_arg == OptionParser::eNoArgument) {
            options.insert(def.short_option);
          }
        }
      }

      if (options.empty() == false) {
        // We have some required options with no arguments
        strm.PutCString(" [-");
        for (i = 0; i < 2; ++i)
          for (options_pos = options.begin(), options_end = options.end();
               options_pos != options_end; ++options_pos) {
            if (i == 0 && ::islower(*options_pos))
              continue;
            if (i == 1 && ::isupper(*options_pos))
              continue;
//.........这里部分代码省略.........