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// CodeMirror, copyright (c) by Marijn Haverbeke and others
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// Distributed under an MIT license: https://codemirror.net/LICENSE
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(function(mod) {
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  if (typeof exports == "object" && typeof module == "object") // CommonJS
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    mod(require("../../lib/codemirror"));
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  else if (typeof define == "function" && define.amd) // AMD
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    define(["../../lib/codemirror"], mod);
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  else // Plain browser env
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    mod(CodeMirror);
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})(function(CodeMirror) {
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"use strict";
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var rfc2822 = [
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  "From", "Sender", "Reply-To", "To", "Cc", "Bcc", "Message-ID",
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  "In-Reply-To", "References", "Resent-From", "Resent-Sender", "Resent-To",
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  "Resent-Cc", "Resent-Bcc", "Resent-Message-ID", "Return-Path", "Received"
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];
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var rfc2822NoEmail = [
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  "Date", "Subject", "Comments", "Keywords", "Resent-Date"
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];
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CodeMirror.registerHelper("hintWords", "mbox", rfc2822.concat(rfc2822NoEmail));
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var whitespace = /^[ \t]/;
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var separator = /^From /; // See RFC 4155
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var rfc2822Header = new RegExp("^(" + rfc2822.join("|") + "): ");
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var rfc2822HeaderNoEmail = new RegExp("^(" + rfc2822NoEmail.join("|") + "): ");
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var header = /^[^:]+:/; // Optional fields defined in RFC 2822
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var email = /^[^ ]+@[^ ]+/;
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var untilEmail = /^.*?(?=[^ ]+?@[^ ]+)/;
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var bracketedEmail = /^<.*?>/;
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var untilBracketedEmail = /^.*?(?=<.*>)/;
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function styleForHeader(header) {
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  if (header === "Subject") return "header";
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  return "string";
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}
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function readToken(stream, state) {
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  if (stream.sol()) {
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    // From last line
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    state.inSeparator = false;
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    if (state.inHeader && stream.match(whitespace)) {
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      // Header folding
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      return null;
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    } else {
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      state.inHeader = false;
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      state.header = null;
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    }
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    if (stream.match(separator)) {
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      state.inHeaders = true;
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      state.inSeparator = true;
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      return "atom";
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    }
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    var match;
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    var emailPermitted = false;
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    if ((match = stream.match(rfc2822HeaderNoEmail)) ||
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        (emailPermitted = true) && (match = stream.match(rfc2822Header))) {
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      state.inHeaders = true;
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      state.inHeader = true;
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      state.emailPermitted = emailPermitted;
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      state.header = match[1];
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      return "atom";
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    }
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    // Use vim's heuristics: recognize custom headers only if the line is in a
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    // block of legitimate headers.
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    if (state.inHeaders && (match = stream.match(header))) {
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      state.inHeader = true;
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      state.emailPermitted = true;
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      state.header = match[1];
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      return "atom";
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    }
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    state.inHeaders = false;
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    stream.skipToEnd();
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    return null;
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  }
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  if (state.inSeparator) {
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    if (stream.match(email)) return "link";
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    if (stream.match(untilEmail)) return "atom";
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    stream.skipToEnd();
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    return "atom";
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  }
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  if (state.inHeader) {
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    var style = styleForHeader(state.header);
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    if (state.emailPermitted) {
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      if (stream.match(bracketedEmail)) return style + " link";
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      if (stream.match(untilBracketedEmail)) return style;
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    }
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    stream.skipToEnd();
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    return style;
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  }
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  stream.skipToEnd();
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  return null;
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};
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CodeMirror.defineMode("mbox", function() {
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  return {
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    startState: function() {
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      return {
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        // Is in a mbox separator
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        inSeparator: false,
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        // Is in a mail header
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        inHeader: false,
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        // If bracketed email is permitted. Only applicable when inHeader
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        emailPermitted: false,
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        // Name of current header
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        header: null,
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        // Is in a region of mail headers
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        inHeaders: false
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      };
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    },
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    token: readToken,
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    blankLine: function(state) {
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      state.inHeaders = state.inSeparator = state.inHeader = false;
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    }
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  };
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});
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CodeMirror.defineMIME("application/mbox", "mbox");
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});
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