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   1  // CodeMirror, copyright (c) by Marijn Haverbeke and others
   2  // Distributed under an MIT license: https://codemirror.net/5/LICENSE
   3  
   4  (function(mod) {
   5    if (typeof exports == "object" && typeof module == "object") // CommonJS
   6      mod(require("../../lib/codemirror"));
   7    else if (typeof define == "function" && define.amd) // AMD
   8      define(["../../lib/codemirror"], mod);
   9    else // Plain browser env
  10      mod(CodeMirror);
  11  })(function(CodeMirror) {
  12  "use strict";
  13  
  14  var rfc2822 = [
  15    "From", "Sender", "Reply-To", "To", "Cc", "Bcc", "Message-ID",
  16    "In-Reply-To", "References", "Resent-From", "Resent-Sender", "Resent-To",
  17    "Resent-Cc", "Resent-Bcc", "Resent-Message-ID", "Return-Path", "Received"
  18  ];
  19  var rfc2822NoEmail = [
  20    "Date", "Subject", "Comments", "Keywords", "Resent-Date"
  21  ];
  22  
  23  CodeMirror.registerHelper("hintWords", "mbox", rfc2822.concat(rfc2822NoEmail));
  24  
  25  var whitespace = /^[ \t]/;
  26  var separator = /^From /; // See RFC 4155
  27  var rfc2822Header = new RegExp("^(" + rfc2822.join("|") + "): ");
  28  var rfc2822HeaderNoEmail = new RegExp("^(" + rfc2822NoEmail.join("|") + "): ");
  29  var header = /^[^:]+:/; // Optional fields defined in RFC 2822
  30  var email = /^[^ ]+@[^ ]+/;
  31  var untilEmail = /^.*?(?=[^ ]+?@[^ ]+)/;
  32  var bracketedEmail = /^<.*?>/;
  33  var untilBracketedEmail = /^.*?(?=<.*>)/;
  34  
  35  function styleForHeader(header) {
  36    if (header === "Subject") return "header";
  37    return "string";
  38  }
  39  
  40  function readToken(stream, state) {
  41    if (stream.sol()) {
  42      // From last line
  43      state.inSeparator = false;
  44      if (state.inHeader && stream.match(whitespace)) {
  45        // Header folding
  46        return null;
  47      } else {
  48        state.inHeader = false;
  49        state.header = null;
  50      }
  51  
  52      if (stream.match(separator)) {
  53        state.inHeaders = true;
  54        state.inSeparator = true;
  55        return "atom";
  56      }
  57  
  58      var match;
  59      var emailPermitted = false;
  60      if ((match = stream.match(rfc2822HeaderNoEmail)) ||
  61          (emailPermitted = true) && (match = stream.match(rfc2822Header))) {
  62        state.inHeaders = true;
  63        state.inHeader = true;
  64        state.emailPermitted = emailPermitted;
  65        state.header = match[1];
  66        return "atom";
  67      }
  68  
  69      // Use vim's heuristics: recognize custom headers only if the line is in a
  70      // block of legitimate headers.
  71      if (state.inHeaders && (match = stream.match(header))) {
  72        state.inHeader = true;
  73        state.emailPermitted = true;
  74        state.header = match[1];
  75        return "atom";
  76      }
  77  
  78      state.inHeaders = false;
  79      stream.skipToEnd();
  80      return null;
  81    }
  82  
  83    if (state.inSeparator) {
  84      if (stream.match(email)) return "link";
  85      if (stream.match(untilEmail)) return "atom";
  86      stream.skipToEnd();
  87      return "atom";
  88    }
  89  
  90    if (state.inHeader) {
  91      var style = styleForHeader(state.header);
  92  
  93      if (state.emailPermitted) {
  94        if (stream.match(bracketedEmail)) return style + " link";
  95        if (stream.match(untilBracketedEmail)) return style;
  96      }
  97      stream.skipToEnd();
  98      return style;
  99    }
 100  
 101    stream.skipToEnd();
 102    return null;
 103  };
 104  
 105  CodeMirror.defineMode("mbox", function() {
 106    return {
 107      startState: function() {
 108        return {
 109          // Is in a mbox separator
 110          inSeparator: false,
 111          // Is in a mail header
 112          inHeader: false,
 113          // If bracketed email is permitted. Only applicable when inHeader
 114          emailPermitted: false,
 115          // Name of current header
 116          header: null,
 117          // Is in a region of mail headers
 118          inHeaders: false
 119        };
 120      },
 121      token: readToken,
 122      blankLine: function(state) {
 123        state.inHeaders = state.inSeparator = state.inHeader = false;
 124      }
 125    };
 126  });
 127  
 128  CodeMirror.defineMIME("application/mbox", "mbox");
 129  });