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// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: https://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__"];
  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 delimiters = parserConf.delimiters || parserConf.singleDelimiters || /^[\[\]\{\}@,:`=;\.\\]/;
    //               (Backwards-compatibility with old, cumbersome config system)
    var operators = [parserConf.singleOperators, parserConf.doubleOperators, parserConf.doubleDelimiters, parserConf.tripleDelimiters,
                     parserConf.operators || /^([-+*/%\/&|^]=?|[<>=]+|\/\/=?|\*\*=?|!=|[~!@]|\.\.\.)/]
    for (var i = 0; i < operators.length; i++) if (!operators[i]) operators.splice(i--, 1)

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);

// tokenizers
    function tokenBase(stream, state) {
      var sol = stream.sol() && state.lastToken != "\\"
      if (sol) state.indent = stream.indentation()
      // Handle scope changes
      if (sol && top(state).type == "py") {
        var scopeOffset = top(state).offset;
        if (stream.eatSpace()) {
          var lineOffset = stream.indentation();
          if (lineOffset > scopeOffset)
            pushPyScope(state);
          else if (lineOffset < scopeOffset && dedent(stream, state) && stream.peek() != "#")
            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, inFormat) {
      if (stream.eatSpace()) return null;

// Handle Comments
      if (!inFormat && stream.match(/^#.*/)) 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)) {
        var isFmtString = stream.current().toLowerCase().indexOf('f') !== -1;
        if (!isFmtString) {
          state.tokenize = tokenStringFactory(stream.current(), state.tokenize);
          return state.tokenize(stream, state);
        } else {
          state.tokenize = formatStringFactory(stream.current(), state.tokenize);
          return state.tokenize(stream, state);
        }
      }

for (var i = 0; i < operators.length; i++)
        if (stream.match(operators[i])) return "operator"

if (stream.match(delimiters)) return "punctuation";

if (state.lastToken == "." && stream.match(identifiers))
        return "property";

if (stream.match(keywords) || stream.match(wordOperators))
        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 inFormat ? null :ERRORCLASS;
    }

function formatStringFactory(delimiter, tokenOuter) {
      while ("rubf".indexOf(delimiter.charAt(0).toLowerCase()) >= 0)
        delimiter = delimiter.substr(1);

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

function tokenNestedExpr(depth) {
        return function(stream, state) {
          var inner = tokenBaseInner(stream, state, true)
          if (inner == "punctuation") {
            if (stream.current() == "{") {
              state.tokenize = tokenNestedExpr(depth + 1)
            } else if (stream.current() == "}") {
              if (depth > 1) state.tokenize = tokenNestedExpr(depth - 1)
              else state.tokenize = tokenString
            }
          }
          return inner
        }
      }

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

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

function pushPyScope(state) {
      while (top(state).type != "py") state.scopes.pop()
      state.scopes.push({offset: top(state).offset + conf.indentUnit,
                         type: "py",
                         align: null})
    }

function pushBracketScope(stream, state, type) {
      var align = stream.match(/^[\s\[\{\(]*(?:#|$)/, false) ? null : stream.column() + 1
      state.scopes.push({offset: state.indent + hangingIndent,
                         type: type,
                         align: align})
    }

function dedent(stream, state) {
      var indented = stream.indentation();
      while (state.scopes.length > 1 && top(state).offset > indented) {
        if (top(state).type != "py") return true;
        state.scopes.pop();
      }
      return top(state).offset != indented;
    }

function tokenLexer(stream, state) {
      if (stream.sol()) {
        state.beginningOfLine = true;
        state.dedent = false;
      }

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

// Handle decorators
      if (state.beginningOfLine && current == "@")
        return stream.match(identifiers, false) ? "meta" : py3 ? "operator" : ERRORCLASS;

if (/\S/.test(current)) state.beginningOfLine = false;

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

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

if (current == "lambda") state.lambda = true;
      if (current == ":" && !state.lambda && top(state).type == "py" && stream.match(/^\s*(?:#|$)/, false))
        pushPyScope(state);

if (current.length == 1 && !/string|comment/.test(style)) {
        var delimiter_index = "[({".indexOf(current);
        if (delimiter_index != -1)
          pushBracketScope(stream, state, "])}".slice(delimiter_index, delimiter_index+1));

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

return style;
    }

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

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

if (style && style != "comment")
          state.lastToken = (style == "keyword" || style == "punctuation") ? stream.current() : style;
        if (style == "punctuation") style = null;

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 = scope.type == textAfter.charAt(0) ||
            scope.type == "py" && !state.dedent && /^(else:|elif |except |finally:)/.test(textAfter)
        if (scope.align != null)
          return scope.align - (closing ? 1 : 0)
        else
          return scope.offset - (closing ? hangingIndent : 0)
      },

electricInput: /^\s*([\}\]\)]|else:|elif |except |finally:)$/,
      closeBrackets: {triples: "'\""},
      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")
  });

});