'use client';
var wordRegexp = function(words) {
  return new RegExp("^(?:" + words.join("|") + ")$", "i");
};

var tokenBase = function(stream/*, state*/) {
  curPunc = null;
  var ch = stream.next();
  if (ch ==='"') {
    stream.match(/^.*?"/);
    return "string";
  }
  if (ch === "'") {
    stream.match(/^.*?'/);
    return "string";
  }
  if (/[{}\(\),\.;\[\]]/.test(ch)) {
    curPunc = ch;
    return "punctuation";
  } else if (ch === "/" && stream.eat("/")) {
    stream.skipToEnd();
    return "comment";
  } else if (operatorChars.test(ch)) {
    stream.eatWhile(operatorChars);
    return null;
  } else {
    stream.eatWhile(/[_\w\d]/);
    if (stream.eat(":")) {
      stream.eatWhile(/[\w\d_\-]/);
      return "atom";
    }
    var word = stream.current();
    if (funcs.test(word)) return "builtin";
    if (preds.test(word)) return "def";
    if (keywords.test(word) || systemKeywords.test(word)) return "keyword";
    return "variable";
  }
};
var pushContext = function(state, type, col) {
  return state.context = {
    prev: state.context,
    indent: state.indent,
    col: col,
    type: type
  };
};
var popContext = function(state) {
  state.indent = state.context.indent;
  return state.context = state.context.prev;
};
var curPunc;
var funcs = wordRegexp(["abs", "acos", "allShortestPaths", "asin", "atan", "atan2", "avg", "ceil", "coalesce", "collect", "cos", "cot", "count", "degrees", "e", "endnode", "exp", "extract", "filter", "floor", "haversin", "head", "id", "keys", "labels", "last", "left", "length", "log", "log10", "lower", "ltrim", "max", "min", "node", "nodes", "percentileCont", "percentileDisc", "pi", "radians", "rand", "range", "reduce", "rel", "relationship", "relationships", "replace", "reverse", "right", "round", "rtrim", "shortestPath", "sign", "sin", "size", "split", "sqrt", "startnode", "stdev", "stdevp", "str", "substring", "sum", "tail", "tan", "timestamp", "toFloat", "toInt", "toString", "trim", "type", "upper"]);
var preds = wordRegexp(["all", "and", "any", "contains", "exists", "has", "in", "none", "not", "or", "single", "xor"]);
var keywords = wordRegexp(["as", "asc", "ascending", "assert", "by", "case", "commit", "constraint", "create", "csv", "cypher", "delete", "desc", "descending", "detach", "distinct", "drop", "else", "end", "ends", "explain", "false", "fieldterminator", "foreach", "from", "headers", "in", "index", "is", "join", "limit", "load", "match", "merge", "null", "on", "optional", "order", "periodic", "profile", "remove", "return", "scan", "set", "skip", "start", "starts", "then", "true", "union", "unique", "unwind", "using", "when", "where", "with", "call", "yield"]);
var systemKeywords = wordRegexp(["access", "active", "assign", "all", "alter", "as", "catalog", "change", "copy", "create", "constraint", "constraints", "current", "database", "databases", "dbms", "default", "deny", "drop", "element", "elements", "exists", "from", "grant", "graph", "graphs", "if", "index", "indexes", "label", "labels", "management", "match", "name", "names", "new", "node", "nodes", "not", "of", "on", "or", "password", "populated", "privileges", "property", "read", "relationship", "relationships", "remove", "replace", "required", "revoke", "role", "roles", "set", "show", "start", "status", "stop", "suspended", "to", "traverse", "type", "types", "user", "users", "with", "write"]);
var operatorChars = /[*+\-<>=&|~%^]/;

const cypher = {
  name: "cypher",
  startState: function() {
    return {
      tokenize: tokenBase,
      context: null,
      indent: 0,
      col: 0
    };
  },
  token: function(stream, state) {
    if (stream.sol()) {
      if (state.context && (state.context.align == null)) {
        state.context.align = false;
      }
      state.indent = stream.indentation();
    }
    if (stream.eatSpace()) {
      return null;
    }
    var style = state.tokenize(stream, state);
    if (style !== "comment" && state.context && (state.context.align == null) && state.context.type !== "pattern") {
      state.context.align = true;
    }
    if (curPunc === "(") {
      pushContext(state, ")", stream.column());
    } else if (curPunc === "[") {
      pushContext(state, "]", stream.column());
    } else if (curPunc === "{") {
      pushContext(state, "}", stream.column());
    } else if (/[\]\}\)]/.test(curPunc)) {
      while (state.context && state.context.type === "pattern") {
        popContext(state);
      }
      if (state.context && curPunc === state.context.type) {
        popContext(state);
      }
    } else if (curPunc === "." && state.context && state.context.type === "pattern") {
      popContext(state);
    } else if (/atom|string|variable/.test(style) && state.context) {
      if (/[\}\]]/.test(state.context.type)) {
        pushContext(state, "pattern", stream.column());
      } else if (state.context.type === "pattern" && !state.context.align) {
        state.context.align = true;
        state.context.col = stream.column();
      }
    }
    return style;
  },
  indent: function(state, textAfter, cx) {
    var firstChar = textAfter && textAfter.charAt(0);
    var context = state.context;
    if (/[\]\}]/.test(firstChar)) {
      while (context && context.type === "pattern") {
        context = context.prev;
      }
    }
    var closing = context && firstChar === context.type;
    if (!context) return 0;
    if (context.type === "keywords") return null
    if (context.align) return context.col + (closing ? 0 : 1);
    return context.indent + (closing ? 0 : cx.unit);
  }
};

export { cypher };
