text: // Copyright (c) 2012-2018, Matt Godbolt
  //
  // All rights reserved.
  //
  // 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.
  //
  // 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 HOLDER 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.
  
  const asmDocs = require('./asm-docs'),
      props = require('../properties');
  
  class Handler {
      constructor() {
          const asmProps = props.propsFor("asm-docs");
          this.staticMaxAgeSecs = asmProps('staticMaxAgeSecs', 10);
          this.atAndTSuffixRemover = /^([A-Z]+)[BWLQ]$/i;
      }
  
      handle(req, res) {
          let info = asmDocs.getAsmOpcode(req.params.opcode);
          if (!info) {
              // If the opcode ends with an AT&T suffix, try removing that and giving it another go.
              // Ideally, we'd be smarter here, but this is a quick win.
              const suffixRemoved = this.atAndTSuffixRemover.exec(req.params.opcode);
              if (suffixRemoved) {
                  info = asmDocs.getAsmOpcode(suffixRemoved[1]);
              }
          }
          if (this.staticMaxAgeSecs) {
              res.setHeader('Cache-Control', 'public, max-age=' + this.staticMaxAgeSecs);
          }
          if (req.accepts(['text', 'json']) === 'json') {
              res.set('Content-Type', 'application/json');
              res.end(JSON.stringify({found: !!info, result: info}));
          } else {
              res.set('Content-Type', 'text/html');
              if (info)
                  res.end(info.html);
              else
                  res.end("Unknown opcode");
          }
      }
  }
  
  module.exports.Handler = Handler;
  