// CodeMirror, copyright © by Marijn Haverbeke and others // Distributed under an MIT license: codemirror.net/LICENSE

(function(mod) {

if (typeof exports == "object" && typeof module == "object") // CommonJS
  mod(require("../../lib/codemirror"));
else if (typeof define == "function" && define.amd) // AMD
  define(["../../lib/codemirror"], mod);
else // Plain browser env
  mod(CodeMirror);

})(function(CodeMirror) {

"use strict";

function wordRegexp(words) {
  return new RegExp("^((" + words.join(")|(") + "))\\b");
}

var wordOperators = wordRegexp(["and", "or", "not", "is"]);
var commonKeywords = ["as", "assert", "break", "class", "continue",
                      "def", "del", "elif", "else", "except", "finally",
                      "for", "from", "global", "if", "import",
                      "lambda", "pass", "raise", "return",
                      "try", "while", "with", "yield", "in"];
var commonBuiltins = ["abs", "all", "any", "bin", "bool", "bytearray", "callable", "chr",
                      "classmethod", "compile", "complex", "delattr", "dict", "dir", "divmod",
                      "enumerate", "eval", "filter", "float", "format", "frozenset",
                      "getattr", "globals", "hasattr", "hash", "help", "hex", "id",
                      "input", "int", "isinstance", "issubclass", "iter", "len",
                      "list", "locals", "map", "max", "memoryview", "min", "next",
                      "object", "oct", "open", "ord", "pow", "property", "range",
                      "repr", "reversed", "round", "set", "setattr", "slice",
                      "sorted", "staticmethod", "str", "sum", "super", "tuple",
                      "type", "vars", "zip", "__import__", "NotImplemented",
                      "Ellipsis", "__debug__"];
var py2 = {builtins: ["apply", "basestring", "buffer", "cmp", "coerce", "execfile",
                      "file", "intern", "long", "raw_input", "reduce", "reload",
                      "unichr", "unicode", "xrange", "False", "True", "None"],
           keywords: ["exec", "print"]};
var py3 = {builtins: ["ascii", "bytes", "exec", "print"],
           keywords: ["nonlocal", "False", "True", "None"]};

CodeMirror.registerHelper("hintWords", "python", commonKeywords.concat(commonBuiltins));

function top(state) {
  return state.scopes[state.scopes.length - 1];
}

CodeMirror.defineMode("python", function(conf, parserConf) {
  var ERRORCLASS = "error";

  var singleDelimiters = parserConf.singleDelimiters || new RegExp("^[\\(\\)\\[\\]\\{\\}@,:`=;\\.]");
  var doubleOperators = parserConf.doubleOperators || new RegExp("^((==)|(!=)|(<=)|(>=)|(<>)|(<<)|(>>)|(//)|(\\*\\*))");
  var doubleDelimiters = parserConf.doubleDelimiters || new RegExp("^((\\+=)|(\\-=)|(\\*=)|(%=)|(/=)|(&=)|(\\|=)|(\\^=))");
  var tripleDelimiters = parserConf.tripleDelimiters || new RegExp("^((//=)|(>>=)|(<<=)|(\\*\\*=))");

  if (parserConf.version && parseInt(parserConf.version, 10) == 3){
      // since http://legacy.python.org/dev/peps/pep-0465/ @ is also an operator
      var singleOperators = parserConf.singleOperators || new RegExp("^[\\+\\-\\*/%&|\\^~<>!@]");
      var identifiers = parserConf.identifiers|| new RegExp("^[_A-Za-z\u00A1-\uFFFF][_A-Za-z0-9\u00A1-\uFFFF]*");
  } else {
      var singleOperators = parserConf.singleOperators || new RegExp("^[\\+\\-\\*/%&|\\^~<>!]");
      var identifiers = parserConf.identifiers|| new RegExp("^[_A-Za-z][_A-Za-z0-9]*");
  }

  var hangingIndent = parserConf.hangingIndent || conf.indentUnit;

  var myKeywords = commonKeywords, myBuiltins = commonBuiltins;
  if(parserConf.extra_keywords != undefined){
    myKeywords = myKeywords.concat(parserConf.extra_keywords);
  }
  if(parserConf.extra_builtins != undefined){
    myBuiltins = myBuiltins.concat(parserConf.extra_builtins);
  }
  if (parserConf.version && parseInt(parserConf.version, 10) == 3) {
    myKeywords = myKeywords.concat(py3.keywords);
    myBuiltins = myBuiltins.concat(py3.builtins);
    var stringPrefixes = new RegExp("^(([rb]|(br))?('{3}|\"{3}|['\"]))", "i");
  } else {
    myKeywords = myKeywords.concat(py2.keywords);
    myBuiltins = myBuiltins.concat(py2.builtins);
    var stringPrefixes = new RegExp("^(([rub]|(ur)|(br))?('{3}|\"{3}|['\"]))", "i");
  }
  var keywords = wordRegexp(myKeywords);
  var builtins = wordRegexp(myBuiltins);

  // tokenizers
  function tokenBase(stream, state) {
    // Handle scope changes
    if (stream.sol() && top(state).type == "py") {
      var scopeOffset = top(state).offset;
      if (stream.eatSpace()) {
        var lineOffset = stream.indentation();
        if (lineOffset > scopeOffset)
          pushScope(stream, state, "py");
        else if (lineOffset < scopeOffset && dedent(stream, state))
          state.errorToken = true;
        return null;
      } else {
        var style = tokenBaseInner(stream, state);
        if (scopeOffset > 0 && dedent(stream, state))
          style += " " + ERRORCLASS;
        return style;
      }
    }
    return tokenBaseInner(stream, state);
  }

  function tokenBaseInner(stream, state) {
    if (stream.eatSpace()) return null;

    var ch = stream.peek();

    // Handle Comments
    if (ch == "#") {
      stream.skipToEnd();
      return "comment";
    }

    // Handle Number Literals
    if (stream.match(/^[0-9\.]/, false)) {
      var floatLiteral = false;
      // Floats
      if (stream.match(/^\d*\.\d+(e[\+\-]?\d+)?/i)) { floatLiteral = true; }
      if (stream.match(/^\d+\.\d*/)) { floatLiteral = true; }
      if (stream.match(/^\.\d+/)) { floatLiteral = true; }
      if (floatLiteral) {
        // Float literals may be "imaginary"
        stream.eat(/J/i);
        return "number";
      }
      // Integers
      var intLiteral = false;
      // Hex
      if (stream.match(/^0x[0-9a-f]+/i)) intLiteral = true;
      // Binary
      if (stream.match(/^0b[01]+/i)) intLiteral = true;
      // Octal
      if (stream.match(/^0o[0-7]+/i)) intLiteral = true;
      // Decimal
      if (stream.match(/^[1-9]\d*(e[\+\-]?\d+)?/)) {
        // Decimal literals may be "imaginary"
        stream.eat(/J/i);
        // TODO - Can you have imaginary longs?
        intLiteral = true;
      }
      // Zero by itself with no other piece of number.
      if (stream.match(/^0(?![\dx])/i)) intLiteral = true;
      if (intLiteral) {
        // Integer literals may be "long"
        stream.eat(/L/i);
        return "number";
      }
    }

    // Handle Strings
    if (stream.match(stringPrefixes)) {
      state.tokenize = tokenStringFactory(stream.current());
      return state.tokenize(stream, state);
    }

    // Handle operators and Delimiters
    if (stream.match(tripleDelimiters) || stream.match(doubleDelimiters))
      return null;

    if (stream.match(doubleOperators)
        || stream.match(singleOperators)
        || stream.match(wordOperators))
      return "operator";

    if (stream.match(singleDelimiters))
      return null;

    if (stream.match(keywords))
      return "keyword";

    if (stream.match(builtins))
      return "builtin";

    if (stream.match(/^(self|cls)\b/))
      return "variable-2";

    if (stream.match(identifiers)) {
      if (state.lastToken == "def" || state.lastToken == "class")
        return "def";
      return "variable";
    }

    // Handle non-detected items
    stream.next();
    return ERRORCLASS;
  }

  function tokenStringFactory(delimiter) {
    while ("rub".indexOf(delimiter.charAt(0).toLowerCase()) >= 0)
      delimiter = delimiter.substr(1);

    var singleline = delimiter.length == 1;
    var OUTCLASS = "string";

    function tokenString(stream, state) {
      while (!stream.eol()) {
        stream.eatWhile(/[^'"\\]/);
        if (stream.eat("\\")) {
          stream.next();
          if (singleline && stream.eol())
            return OUTCLASS;
        } else if (stream.match(delimiter)) {
          state.tokenize = tokenBase;
          return OUTCLASS;
        } else {
          stream.eat(/['"]/);
        }
      }
      if (singleline) {
        if (parserConf.singleLineStringErrors)
          return ERRORCLASS;
        else
          state.tokenize = tokenBase;
      }
      return OUTCLASS;
    }
    tokenString.isString = true;
    return tokenString;
  }

  function pushScope(stream, state, type) {
    var offset = 0, align = null;
    if (type == "py") {
      while (top(state).type != "py")
        state.scopes.pop();
    }
    offset = top(state).offset + (type == "py" ? conf.indentUnit : hangingIndent);
    if (type != "py" && !stream.match(/^(\s|#.*)*$/, false))
      align = stream.column() + 1;
    state.scopes.push({offset: offset, type: type, align: align});
  }

  function dedent(stream, state) {
    var indented = stream.indentation();
    while (top(state).offset > indented) {
      if (top(state).type != "py") return true;
      state.scopes.pop();
    }
    return top(state).offset != indented;
  }

  function tokenLexer(stream, state) {
    var style = state.tokenize(stream, state);
    var current = stream.current();

    // Handle '.' connected identifiers
    if (current == ".") {
      style = stream.match(identifiers, false) ? null : ERRORCLASS;
      if (style == null && state.lastStyle == "meta") {
        // Apply 'meta' style to '.' connected identifiers when
        // appropriate.
        style = "meta";
      }
      return style;
    }

    // Handle decorators
    if (current == "@"){
      if(parserConf.version && parseInt(parserConf.version, 10) == 3){
          return stream.match(identifiers, false) ? "meta" : "operator";
      } else {
          return stream.match(identifiers, false) ? "meta" : ERRORCLASS;
      }
    }

    if ((style == "variable" || style == "builtin")
        && state.lastStyle == "meta")
      style = "meta";

    // Handle scope changes.
    if (current == "pass" || current == "return")
      state.dedent += 1;

    if (current == "lambda") state.lambda = true;
    if (current == ":" && !state.lambda && top(state).type == "py")
      pushScope(stream, state, "py");

    var delimiter_index = current.length == 1 ? "[({".indexOf(current) : -1;
    if (delimiter_index != -1)
      pushScope(stream, state, "])}".slice(delimiter_index, delimiter_index+1));

    delimiter_index = "])}".indexOf(current);
    if (delimiter_index != -1) {
      if (top(state).type == current) state.scopes.pop();
      else return ERRORCLASS;
    }
    if (state.dedent > 0 && stream.eol() && top(state).type == "py") {
      if (state.scopes.length > 1) state.scopes.pop();
      state.dedent -= 1;
    }

    return style;
  }

  var external = {
    startState: function(basecolumn) {
      return {
        tokenize: tokenBase,
        scopes: [{offset: basecolumn || 0, type: "py", align: null}],
        lastStyle: null,
        lastToken: null,
        lambda: false,
        dedent: 0
      };
    },

    token: function(stream, state) {
      var addErr = state.errorToken;
      if (addErr) state.errorToken = false;
      var style = tokenLexer(stream, state);

      state.lastStyle = style;

      var current = stream.current();
      if (current && style)
        state.lastToken = current;

      if (stream.eol() && state.lambda)
        state.lambda = false;
      return addErr ? style + " " + ERRORCLASS : style;
    },

    indent: function(state, textAfter) {
      if (state.tokenize != tokenBase)
        return state.tokenize.isString ? CodeMirror.Pass : 0;

      var scope = top(state);
      var closing = textAfter && textAfter.charAt(0) == scope.type;
      if (scope.align != null)
        return scope.align - (closing ? 1 : 0);
      else if (closing && state.scopes.length > 1)
        return state.scopes[state.scopes.length - 2].offset;
      else
        return scope.offset;
    },

    lineComment: "#",
    fold: "indent"
  };
  return external;
});

CodeMirror.defineMIME("text/x-python", "python");

var words = function(str) { return str.split(" "); };

CodeMirror.defineMIME("text/x-cython", {
  name: "python",
  extra_keywords: words("by cdef cimport cpdef ctypedef enum except"+
                        "extern gil include nogil property public"+
                        "readonly struct union DEF IF ELIF ELSE")
});

});