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Edit: rst.js

// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: http://codemirror.net/LICENSE

(function(mod) {
  if (typeof exports == "object" && typeof module == "object") // CommonJS
    mod(require("../../lib/codemirror"), require("../python/python"), require("../stex/stex"), require("../../addon/mode/overlay"));
  else if (typeof define == "function" && define.amd) // AMD
    define(["../../lib/codemirror", "../python/python", "../stex/stex", "../../addon/mode/overlay"], mod);
  else // Plain browser env
    mod(CodeMirror);
})(function(CodeMirror) {
"use strict";

CodeMirror.defineMode('rst', function (config, options) {

var rx_strong = /^\*\*[^\*\s](?:[^\*]*[^\*\s])?\*\*/;
  var rx_emphasis = /^\*[^\*\s](?:[^\*]*[^\*\s])?\*/;
  var rx_literal = /^``[^`\s](?:[^`]*[^`\s])``/;

var rx_number = /^(?:[\d]+(?:[\.,]\d+)*)/;
  var rx_positive = /^(?:\s\+[\d]+(?:[\.,]\d+)*)/;
  var rx_negative = /^(?:\s\-[\d]+(?:[\.,]\d+)*)/;

var rx_uri_protocol = "[Hh][Tt][Tt][Pp][Ss]?://";
  var rx_uri_domain = "(?:[\\d\\w.-]+)\\.(?:\\w{2,6})";
  var rx_uri_path = "(?:/[\\d\\w\\#\\%\\&\\-\\.\\,\\/\\:\\=\\?\\~]+)*";
  var rx_uri = new RegExp("^" + rx_uri_protocol + rx_uri_domain + rx_uri_path);

var overlay = {
    token: function (stream) {

if (stream.match(rx_strong) && stream.match (/\W+|$/, false))
        return 'strong';
      if (stream.match(rx_emphasis) && stream.match (/\W+|$/, false))
        return 'em';
      if (stream.match(rx_literal) && stream.match (/\W+|$/, false))
        return 'string-2';
      if (stream.match(rx_number))
        return 'number';
      if (stream.match(rx_positive))
        return 'positive';
      if (stream.match(rx_negative))
        return 'negative';
      if (stream.match(rx_uri))
        return 'link';

while (stream.next() != null) {
        if (stream.match(rx_strong, false)) break;
        if (stream.match(rx_emphasis, false)) break;
        if (stream.match(rx_literal, false)) break;
        if (stream.match(rx_number, false)) break;
        if (stream.match(rx_positive, false)) break;
        if (stream.match(rx_negative, false)) break;
        if (stream.match(rx_uri, false)) break;
      }

return null;
    }
  };

var mode = CodeMirror.getMode(
    config, options.backdrop || 'rst-base'
  );

return CodeMirror.overlayMode(mode, overlay, true); // combine
}, 'python', 'stex');

///////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////

CodeMirror.defineMode('rst-base', function (config) {

///////////////////////////////////////////////////////////////////////////
  ///////////////////////////////////////////////////////////////////////////

///////////////////////////////////////////////////////////////////////////
  ///////////////////////////////////////////////////////////////////////////

var mode_python = CodeMirror.getMode(config, 'python');
  var mode_stex = CodeMirror.getMode(config, 'stex');

///////////////////////////////////////////////////////////////////////////
  ///////////////////////////////////////////////////////////////////////////

var SEPA = "\\s+";
  var TAIL = "(?:\\s*|\\W|$)",
  rx_TAIL = new RegExp(format('^{0}', TAIL));

var TEXT1 = "(?:[^\\s\\|](?:[^\\|]*[^\\s\\|])?)";
  var TEXT2 = "(?:[^\\`]+)",
  rx_TEXT2 = new RegExp(format('^{0}', TEXT2));

var rx_verbatim = new RegExp('^::\\s*$');
  var rx_examples = new RegExp('^\\s+(?:>>>|In \\[\\d+\\]:)\\s');

///////////////////////////////////////////////////////////////////////////
  ///////////////////////////////////////////////////////////////////////////

function to_normal(stream, state) {
    var token = null;

if (stream.sol() && stream.match(rx_examples, false)) {
      change(state, to_mode, {
        mode: mode_python, local: CodeMirror.startState(mode_python)
      });
    } else if (stream.sol() && stream.match(rx_explicit)) {
      change(state, to_explicit);
      token = 'meta';
    } else if (stream.sol() && stream.match(rx_section)) {
      change(state, to_normal);
      token = 'header';
    } else if (phase(state) == rx_role_pre ||
               stream.match(rx_role_pre, false)) {

switch (stage(state)) {
      case 0:
        change(state, to_normal, context(rx_role_pre, 1));
        stream.match(/^:/);
        token = 'meta';
        break;
      case 1:
        change(state, to_normal, context(rx_role_pre, 2));
        stream.match(rx_NAME);
        token = 'keyword';

if (stream.current().match(/^(?:math|latex)/)) {
          state.tmp_stex = true;
        }
        break;
      case 2:
        change(state, to_normal, context(rx_role_pre, 3));
        stream.match(/^:`/);
        token = 'meta';
        break;
      case 3:
        if (state.tmp_stex) {
          state.tmp_stex = undefined; state.tmp = {
            mode: mode_stex, local: CodeMirror.startState(mode_stex)
          };
        }

if (state.tmp) {
          if (stream.peek() == '`') {
            change(state, to_normal, context(rx_role_pre, 4));
            state.tmp = undefined;
            break;
          }

token = state.tmp.mode.token(stream, state.tmp.local);
          break;
        }

change(state, to_normal, context(rx_role_pre, 4));
        stream.match(rx_TEXT2);
        token = 'string';
        break;
      case 4:
        change(state, to_normal, context(rx_role_pre, 5));
        stream.match(/^`/);
        token = 'meta';
        break;
      case 5:
        change(state, to_normal, context(rx_role_pre, 6));
        stream.match(rx_TAIL);
        break;
      default:
        change(state, to_normal);
      }
    } else if (phase(state) == rx_role_suf ||
               stream.match(rx_role_suf, false)) {

switch (stage(state)) {
      case 0:
        change(state, to_normal, context(rx_role_suf, 1));
        stream.match(/^`/);
        token = 'meta';
        break;
      case 1:
        change(state, to_normal, context(rx_role_suf, 2));
        stream.match(rx_TEXT2);
        token = 'string';
        break;
      case 2:
        change(state, to_normal, context(rx_role_suf, 3));
        stream.match(/^`:/);
        token = 'meta';
        break;
      case 3:
        change(state, to_normal, context(rx_role_suf, 4));
        stream.match(rx_NAME);
        token = 'keyword';
        break;
      case 4:
        change(state, to_normal, context(rx_role_suf, 5));
        stream.match(/^:/);
        token = 'meta';
        break;
      case 5:
        change(state, to_normal, context(rx_role_suf, 6));
        stream.match(rx_TAIL);
        break;
      default:
        change(state, to_normal);
      }
    } else if (phase(state) == rx_role || stream.match(rx_role, false)) {

switch (stage(state)) {
      case 0:
        change(state, to_normal, context(rx_role, 1));
        stream.match(/^:/);
        token = 'meta';
        break;
      case 1:
        change(state, to_normal, context(rx_role, 2));
        stream.match(rx_NAME);
        token = 'keyword';
        break;
      case 2:
        change(state, to_normal, context(rx_role, 3));
        stream.match(/^:/);
        token = 'meta';
        break;
      case 3:
        change(state, to_normal, context(rx_role, 4));
        stream.match(rx_TAIL);
        break;
      default:
        change(state, to_normal);
      }
    } else if (phase(state) == rx_substitution_ref ||
               stream.match(rx_substitution_ref, false)) {

switch (stage(state)) {
      case 0:
        change(state, to_normal, context(rx_substitution_ref, 1));
        stream.match(rx_substitution_text);
        token = 'variable-2';
        break;
      case 1:
        change(state, to_normal, context(rx_substitution_ref, 2));
        if (stream.match(/^_?_?/)) token = 'link';
        break;
      default:
        change(state, to_normal);
      }
    } else if (stream.match(rx_footnote_ref)) {
      change(state, to_normal);
      token = 'quote';
    } else if (stream.match(rx_citation_ref)) {
      change(state, to_normal);
      token = 'quote';
    } else if (stream.match(rx_link_ref1)) {
      change(state, to_normal);
      if (!stream.peek() || stream.peek().match(/^\W$/)) {
        token = 'link';
      }
    } else if (phase(state) == rx_link_ref2 ||
               stream.match(rx_link_ref2, false)) {

switch (stage(state)) {
      case 0:
        if (!stream.peek() || stream.peek().match(/^\W$/)) {
          change(state, to_normal, context(rx_link_ref2, 1));
        } else {
          stream.match(rx_link_ref2);
        }
        break;
      case 1:
        change(state, to_normal, context(rx_link_ref2, 2));
        stream.match(/^`/);
        token = 'link';
        break;
      case 2:
        change(state, to_normal, context(rx_link_ref2, 3));
        stream.match(rx_TEXT2);
        break;
      case 3:
        change(state, to_normal, context(rx_link_ref2, 4));
        stream.match(/^`_/);
        token = 'link';
        break;
      default:
        change(state, to_normal);
      }
    } else if (stream.match(rx_verbatim)) {
      change(state, to_verbatim);
    }

else {
      if (stream.next()) change(state, to_normal);
    }

return token;
  }

///////////////////////////////////////////////////////////////////////////
  ///////////////////////////////////////////////////////////////////////////

function to_explicit(stream, state) {
    var token = null;

if (phase(state) == rx_substitution ||
        stream.match(rx_substitution, false)) {

switch (stage(state)) {
      case 0:
        change(state, to_explicit, context(rx_substitution, 1));
        stream.match(rx_substitution_text);
        token = 'variable-2';
        break;
      case 1:
        change(state, to_explicit, context(rx_substitution, 2));
        stream.match(rx_substitution_sepa);
        break;
      case 2:
        change(state, to_explicit, context(rx_substitution, 3));
        stream.match(rx_substitution_name);
        token = 'keyword';
        break;
      case 3:
        change(state, to_explicit, context(rx_substitution, 4));
        stream.match(rx_substitution_tail);
        token = 'meta';
        break;
      default:
        change(state, to_normal);
      }
    } else if (phase(state) == rx_directive ||
               stream.match(rx_directive, false)) {

switch (stage(state)) {
      case 0:
        change(state, to_explicit, context(rx_directive, 1));
        stream.match(rx_directive_name);
        token = 'keyword';

if (stream.current().match(/^(?:math|latex)/))
          state.tmp_stex = true;
        else if (stream.current().match(/^python/))
          state.tmp_py = true;
        break;
      case 1:
        change(state, to_explicit, context(rx_directive, 2));
        stream.match(rx_directive_tail);
        token = 'meta';

if (stream.match(/^latex\s*$/) || state.tmp_stex) {
          state.tmp_stex = undefined; change(state, to_mode, {
            mode: mode_stex, local: CodeMirror.startState(mode_stex)
          });
        }
        break;
      case 2:
        change(state, to_explicit, context(rx_directive, 3));
        if (stream.match(/^python\s*$/) || state.tmp_py) {
          state.tmp_py = undefined; change(state, to_mode, {
            mode: mode_python, local: CodeMirror.startState(mode_python)
          });
        }
        break;
      default:
        change(state, to_normal);
      }
    } else if (phase(state) == rx_link || stream.match(rx_link, false)) {

switch (stage(state)) {
      case 0:
        change(state, to_explicit, context(rx_link, 1));
        stream.match(rx_link_head);
        stream.match(rx_link_name);
        token = 'link';
        break;
      case 1:
        change(state, to_explicit, context(rx_link, 2));
        stream.match(rx_link_tail);
        token = 'meta';
        break;
      default:
        change(state, to_normal);
      }
    } else if (stream.match(rx_footnote)) {
      change(state, to_normal);
      token = 'quote';
    } else if (stream.match(rx_citation)) {
      change(state, to_normal);
      token = 'quote';
    }

else {
      stream.eatSpace();
      if (stream.eol()) {
        change(state, to_normal);
      } else {
        stream.skipToEnd();
        change(state, to_comment);
        token = 'comment';
      }
    }

return token;
  }

///////////////////////////////////////////////////////////////////////////
  ///////////////////////////////////////////////////////////////////////////

function to_comment(stream, state) {
    return as_block(stream, state, 'comment');
  }

function to_verbatim(stream, state) {
    return as_block(stream, state, 'meta');
  }

///////////////////////////////////////////////////////////////////////////
  ///////////////////////////////////////////////////////////////////////////

function to_mode(stream, state) {

if (state.ctx.mode && state.ctx.local) {

if (stream.sol()) {
        if (!stream.eatSpace()) change(state, to_normal);
        return null;
      }

return state.ctx.mode.token(stream, state.ctx.local);
    }

change(state, to_normal);
    return null;
  }

///////////////////////////////////////////////////////////////////////////
  ///////////////////////////////////////////////////////////////////////////

function context(phase, stage, mode, local) {
    return {phase: phase, stage: stage, mode: mode, local: local};
  }

function change(state, tok, ctx) {
    state.tok = tok;
    state.ctx = ctx || {};
  }

function stage(state) {
    return state.ctx.stage || 0;
  }

function phase(state) {
    return state.ctx.phase;
  }

///////////////////////////////////////////////////////////////////////////
  ///////////////////////////////////////////////////////////////////////////

return {
    startState: function () {
      return {tok: to_normal, ctx: context(undefined, 0)};
    },

copyState: function (state) {
      var ctx = state.ctx, tmp = state.tmp;
      if (ctx.local)
        ctx = {mode: ctx.mode, local: CodeMirror.copyState(ctx.mode, ctx.local)};
      if (tmp)
        tmp = {mode: tmp.mode, local: CodeMirror.copyState(tmp.mode, tmp.local)};
      return {tok: state.tok, ctx: ctx, tmp: tmp};
    },

innerMode: function (state) {
      return state.tmp      ? {state: state.tmp.local, mode: state.tmp.mode}
      : state.ctx.mode ? {state: state.ctx.local, mode: state.ctx.mode}
      : null;
    },

token: function (stream, state) {
      return state.tok(stream, state);
    }
  };
}, 'python', 'stex');

///////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////

CodeMirror.defineMIME('text/x-rst', 'rst');

///////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////

});