'use client';
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", "False", "True"];
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__"];

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

function mkPython(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;

  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);

  var py3 = !(parserConf.version && Number(parserConf.version) < 3);
  if (py3) {
    // since http://legacy.python.org/dev/peps/pep-0465/ @ is also an operator
    var identifiers = parserConf.identifiers|| /^[_A-Za-z\u00A1-\uFFFF][_A-Za-z0-9\u00A1-\uFFFF]*/;
    myKeywords = myKeywords.concat(["nonlocal", "None", "aiter", "anext", "async", "await", "breakpoint", "match", "case"]);
    myBuiltins = myBuiltins.concat(["ascii", "bytes", "exec", "print"]);
    var stringPrefixes = new RegExp("^(([rbuf]|(br)|(rb)|(fr)|(rf))?('{3}|\"{3}|['\"]))", "i");
  } else {
    var identifiers = parserConf.identifiers|| /^[_A-Za-z][_A-Za-z0-9]*/;
    myKeywords = myKeywords.concat(["exec", "print"]);
    myBuiltins = myBuiltins.concat(["apply", "basestring", "buffer", "cmp", "coerce", "execfile",
                                    "file", "intern", "long", "raw_input", "reduce", "reload",
                                    "unichr", "unicode", "xrange", "None"]);
    var stringPrefixes = new RegExp("^(([rubf]|(ur)|(br))?('{3}|\"{3}|['\"]))", "i");
  }
  var keywords = wordRegexp(myKeywords);
  var builtins = wordRegexp(myBuiltins);

  // 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(stream, 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 "self";

    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 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 = tokenOuter;
          return OUTCLASS;
        } else if (stream.match('{{')) {
          // ignore {{ in f-str
          return OUTCLASS;
        } else if (stream.match('{', false)) {
          // switch to nested mode
          state.tokenize = tokenNestedExpr(0);
          if (stream.current()) return OUTCLASS;
          else return state.tokenize(stream, state)
        } else if (stream.match('}}')) {
          return OUTCLASS;
        } else if (stream.match('}')) {
          // single } in f-string is an error
          return ERRORCLASS;
        } else {
          stream.eat(/['"]/);
        }
      }
      if (singleline) {
        if (parserConf.singleLineStringErrors)
          return ERRORCLASS;
        else
          state.tokenize = tokenOuter;
      }
      return OUTCLASS;
    }
    tokenString.isString = true;
    return tokenString;
  }

  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 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 = tokenOuter;
          return OUTCLASS;
        } else {
          stream.eat(/['"]/);
        }
      }
      if (singleline) {
        if (parserConf.singleLineStringErrors)
          return ERRORCLASS;
        else
          state.tokenize = tokenOuter;
      }
      return OUTCLASS;
    }
    tokenString.isString = true;
    return tokenString;
  }

  function pushPyScope(stream, state) {
    while (top(state).type != "py") state.scopes.pop();
    state.scopes.push({offset: top(state).offset + stream.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 || stream.indentUnit),
                       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(stream, 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 || stream.indentUnit);
        else return ERRORCLASS;
      }
    }
    if (state.dedent && stream.eol() && top(state).type == "py" && state.scopes.length > 1)
      state.scopes.pop();

    return style;
  }

  return {
    name: "python",

    startState: function() {
      return {
        tokenize: tokenBase,
        scopes: [{offset: 0, type: "py", align: null}],
        indent: 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 ? ERRORCLASS : style;
    },

    indent: function(state, textAfter, cx) {
      if (state.tokenize != tokenBase)
        return state.tokenize.isString ? null : 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 || cx.unit : 0)
    },

    languageData: {
      autocomplete: commonKeywords.concat(commonBuiltins).concat(["exec", "print"]),
      indentOnInput: /^\s*([\}\]\)]|else:|elif |except |finally:)$/,
      commentTokens: {line: "#"},
      closeBrackets: {brackets: ["(", "[", "{", "'", '"', "'''", '"""']}
    }
  };
}
var words = function(str) { return str.split(" "); };

const python = mkPython({});

const cython = mkPython({
  extra_keywords: words("by cdef cimport cpdef ctypedef enum except "+
                        "extern gil include nogil property public "+
                        "readonly struct union DEF IF ELIF ELSE")
});

export { cython, mkPython, python };
