'use client';
function mkVerilog(parserConfig) {

  var statementIndentUnit = parserConfig.statementIndentUnit,
      dontAlignCalls = parserConfig.dontAlignCalls,
      noIndentKeywords = parserConfig.noIndentKeywords || [],
      multiLineStrings = parserConfig.multiLineStrings,
      hooks = parserConfig.hooks || {};

  function words(str) {
    var obj = {}, words = str.split(" ");
    for (var i = 0; i < words.length; ++i) obj[words[i]] = true;
    return obj;
  }

  /**
   * Keywords from IEEE 1800-2012
   */
  var keywords = words(
    "accept_on alias always always_comb always_ff always_latch and assert assign assume automatic before begin bind " +
      "bins binsof bit break buf bufif0 bufif1 byte case casex casez cell chandle checker class clocking cmos config " +
      "const constraint context continue cover covergroup coverpoint cross deassign default defparam design disable " +
      "dist do edge else end endcase endchecker endclass endclocking endconfig endfunction endgenerate endgroup " +
      "endinterface endmodule endpackage endprimitive endprogram endproperty endspecify endsequence endtable endtask " +
      "enum event eventually expect export extends extern final first_match for force foreach forever fork forkjoin " +
      "function generate genvar global highz0 highz1 if iff ifnone ignore_bins illegal_bins implements implies import " +
      "incdir include initial inout input inside instance int integer interconnect interface intersect join join_any " +
      "join_none large let liblist library local localparam logic longint macromodule matches medium modport module " +
      "nand negedge nettype new nexttime nmos nor noshowcancelled not notif0 notif1 null or output package packed " +
      "parameter pmos posedge primitive priority program property protected pull0 pull1 pulldown pullup " +
      "pulsestyle_ondetect pulsestyle_onevent pure rand randc randcase randsequence rcmos real realtime ref reg " +
      "reject_on release repeat restrict return rnmos rpmos rtran rtranif0 rtranif1 s_always s_eventually s_nexttime " +
      "s_until s_until_with scalared sequence shortint shortreal showcancelled signed small soft solve specify " +
      "specparam static string strong strong0 strong1 struct super supply0 supply1 sync_accept_on sync_reject_on " +
      "table tagged task this throughout time timeprecision timeunit tran tranif0 tranif1 tri tri0 tri1 triand trior " +
      "trireg type typedef union unique unique0 unsigned until until_with untyped use uwire var vectored virtual void " +
      "wait wait_order wand weak weak0 weak1 while wildcard wire with within wor xnor xor");

  /** Operators from IEEE 1800-2012
      unary_operator ::=
      + | - | ! | ~ | & | ~& | | | ~| | ^ | ~^ | ^~
      binary_operator ::=
      + | - | * | / | % | == | != | === | !== | ==? | !=? | && | || | **
      | < | <= | > | >= | & | | | ^ | ^~ | ~^ | >> | << | >>> | <<<
      | -> | <->
      inc_or_dec_operator ::= ++ | --
      unary_module_path_operator ::=
      ! | ~ | & | ~& | | | ~| | ^ | ~^ | ^~
      binary_module_path_operator ::=
      == | != | && | || | & | | | ^ | ^~ | ~^
  */
  var isOperatorChar = /[\+\-\*\/!~&|^%=?:]/;
  var isBracketChar = /[\[\]{}()]/;

  var unsignedNumber = /\d[0-9_]*/;
  var decimalLiteral = /\d*\s*'s?d\s*\d[0-9_]*/i;
  var binaryLiteral = /\d*\s*'s?b\s*[xz01][xz01_]*/i;
  var octLiteral = /\d*\s*'s?o\s*[xz0-7][xz0-7_]*/i;
  var hexLiteral = /\d*\s*'s?h\s*[0-9a-fxz?][0-9a-fxz?_]*/i;
  var realLiteral = /(\d[\d_]*(\.\d[\d_]*)?E-?[\d_]+)|(\d[\d_]*\.\d[\d_]*)/i;

  var closingBracketOrWord = /^((\w+)|[)}\]])/;
  var closingBracket = /[)}\]]/;

  var curPunc;
  var curKeyword;

  // Block openings which are closed by a matching keyword in the form of ("end" + keyword)
  // E.g. "task" => "endtask"
  var blockKeywords = words(
    "case checker class clocking config function generate interface module package " +
      "primitive program property specify sequence table task"
  );

  // Opening/closing pairs
  var openClose = {};
  for (var keyword in blockKeywords) {
    openClose[keyword] = "end" + keyword;
  }
  openClose["begin"] = "end";
  openClose["casex"] = "endcase";
  openClose["casez"] = "endcase";
  openClose["do"   ] = "while";
  openClose["fork" ] = "join;join_any;join_none";
  openClose["covergroup"] = "endgroup";

  for (var i in noIndentKeywords) {
    var keyword = noIndentKeywords[i];
    if (openClose[keyword]) {
      openClose[keyword] = undefined;
    }
  }

  // Keywords which open statements that are ended with a semi-colon
  var statementKeywords = words("always always_comb always_ff always_latch assert assign assume else export for foreach forever if import initial repeat while");

  function tokenBase(stream, state) {
    var ch = stream.peek(), style;
    if (hooks[ch] && (style = hooks[ch](stream, state)) != false) return style;
    if (hooks.tokenBase && (style = hooks.tokenBase(stream, state)) != false)
      return style;

    if (/[,;:\.]/.test(ch)) {
      curPunc = stream.next();
      return null;
    }
    if (isBracketChar.test(ch)) {
      curPunc = stream.next();
      return "bracket";
    }
    // Macros (tick-defines)
    if (ch == '`') {
      stream.next();
      if (stream.eatWhile(/[\w\$_]/)) {
        return "def";
      } else {
        return null;
      }
    }
    // System calls
    if (ch == '$') {
      stream.next();
      if (stream.eatWhile(/[\w\$_]/)) {
        return "meta";
      } else {
        return null;
      }
    }
    // Time literals
    if (ch == '#') {
      stream.next();
      stream.eatWhile(/[\d_.]/);
      return "def";
    }
    // Strings
    if (ch == '"') {
      stream.next();
      state.tokenize = tokenString(ch);
      return state.tokenize(stream, state);
    }
    // Comments
    if (ch == "/") {
      stream.next();
      if (stream.eat("*")) {
        state.tokenize = tokenComment;
        return tokenComment(stream, state);
      }
      if (stream.eat("/")) {
        stream.skipToEnd();
        return "comment";
      }
      stream.backUp(1);
    }

    // Numeric literals
    if (stream.match(realLiteral) ||
        stream.match(decimalLiteral) ||
        stream.match(binaryLiteral) ||
        stream.match(octLiteral) ||
        stream.match(hexLiteral) ||
        stream.match(unsignedNumber) ||
        stream.match(realLiteral)) {
      return "number";
    }

    // Operators
    if (stream.eatWhile(isOperatorChar)) {
      return "meta";
    }

    // Keywords / plain variables
    if (stream.eatWhile(/[\w\$_]/)) {
      var cur = stream.current();
      if (keywords[cur]) {
        if (openClose[cur]) {
          curPunc = "newblock";
        }
        if (statementKeywords[cur]) {
          curPunc = "newstatement";
        }
        curKeyword = cur;
        return "keyword";
      }
      return "variable";
    }

    stream.next();
    return null;
  }

  function tokenString(quote) {
    return function(stream, state) {
      var escaped = false, next, end = false;
      while ((next = stream.next()) != null) {
        if (next == quote && !escaped) {end = true; break;}
        escaped = !escaped && next == "\\";
      }
      if (end || !(escaped || multiLineStrings))
        state.tokenize = tokenBase;
      return "string";
    };
  }

  function tokenComment(stream, state) {
    var maybeEnd = false, ch;
    while (ch = stream.next()) {
      if (ch == "/" && maybeEnd) {
        state.tokenize = tokenBase;
        break;
      }
      maybeEnd = (ch == "*");
    }
    return "comment";
  }

  function Context(indented, column, type, align, prev) {
    this.indented = indented;
    this.column = column;
    this.type = type;
    this.align = align;
    this.prev = prev;
  }
  function pushContext(state, col, type) {
    var indent = state.indented;
    var c = new Context(indent, col, type, null, state.context);
    return state.context = c;
  }
  function popContext(state) {
    var t = state.context.type;
    if (t == ")" || t == "]" || t == "}") {
      state.indented = state.context.indented;
    }
    return state.context = state.context.prev;
  }

  function isClosing(text, contextClosing) {
    if (text == contextClosing) {
      return true;
    } else {
      // contextClosing may be multiple keywords separated by ;
      var closingKeywords = contextClosing.split(";");
      for (var i in closingKeywords) {
        if (text == closingKeywords[i]) {
          return true;
        }
      }
      return false;
    }
  }

  function buildElectricInputRegEx() {
    // Reindentation should occur on any bracket char: {}()[]
    // or on a match of any of the block closing keywords, at
    // the end of a line
    var allClosings = [];
    for (var i in openClose) {
      if (openClose[i]) {
        var closings = openClose[i].split(";");
        for (var j in closings) {
          allClosings.push(closings[j]);
        }
      }
    }
    var re = new RegExp("[{}()\\[\\]]|(" + allClosings.join("|") + ")$");
    return re;
  }

  // Interface
  return {
    name: "verilog",

    startState: function(indentUnit) {
      var state = {
        tokenize: null,
        context: new Context(-indentUnit, 0, "top", false),
        indented: 0,
        startOfLine: true
      };
      if (hooks.startState) hooks.startState(state);
      return state;
    },

    token: function(stream, state) {
      var ctx = state.context;
      if (stream.sol()) {
        if (ctx.align == null) ctx.align = false;
        state.indented = stream.indentation();
        state.startOfLine = true;
      }
      if (hooks.token) {
        // Call hook, with an optional return value of a style to override verilog styling.
        var style = hooks.token(stream, state);
        if (style !== undefined) {
          return style;
        }
      }
      if (stream.eatSpace()) return null;
      curPunc = null;
      curKeyword = null;
      var style = (state.tokenize || tokenBase)(stream, state);
      if (style == "comment" || style == "meta" || style == "variable") return style;
      if (ctx.align == null) ctx.align = true;

      if (curPunc == ctx.type) {
        popContext(state);
      } else if ((curPunc == ";" && ctx.type == "statement") ||
                 (ctx.type && isClosing(curKeyword, ctx.type))) {
        ctx = popContext(state);
        while (ctx && ctx.type == "statement") ctx = popContext(state);
      } else if (curPunc == "{") {
        pushContext(state, stream.column(), "}");
      } else if (curPunc == "[") {
        pushContext(state, stream.column(), "]");
      } else if (curPunc == "(") {
        pushContext(state, stream.column(), ")");
      } else if (ctx && ctx.type == "endcase" && curPunc == ":") {
        pushContext(state, stream.column(), "statement");
      } else if (curPunc == "newstatement") {
        pushContext(state, stream.column(), "statement");
      } else if (curPunc == "newblock") {
        if (curKeyword == "function" && ctx && (ctx.type == "statement" || ctx.type == "endgroup")) ; else if (curKeyword == "task" && ctx && ctx.type == "statement") ; else {
          var close = openClose[curKeyword];
          pushContext(state, stream.column(), close);
        }
      }

      state.startOfLine = false;
      return style;
    },

    indent: function(state, textAfter, cx) {
      if (state.tokenize != tokenBase && state.tokenize != null) return null;
      if (hooks.indent) {
        var fromHook = hooks.indent(state);
        if (fromHook >= 0) return fromHook;
      }
      var ctx = state.context, firstChar = textAfter && textAfter.charAt(0);
      if (ctx.type == "statement" && firstChar == "}") ctx = ctx.prev;
      var closing = false;
      var possibleClosing = textAfter.match(closingBracketOrWord);
      if (possibleClosing)
        closing = isClosing(possibleClosing[0], ctx.type);
      if (ctx.type == "statement") return ctx.indented + (firstChar == "{" ? 0 : statementIndentUnit || cx.unit);
      else if (closingBracket.test(ctx.type) && ctx.align && !dontAlignCalls) return ctx.column + (closing ? 0 : 1);
      else if (ctx.type == ")" && !closing) return ctx.indented + (statementIndentUnit || cx.unit);
      else return ctx.indented + (closing ? 0 : cx.unit);
    },

    languageData: {
      indentOnInput: buildElectricInputRegEx(),
      commentTokens: {line: "//", block: {open: "/*", close: "*/"}}
    }
  };
}
const verilog = mkVerilog({});

// TL-Verilog mode.
// See tl-x.org for language spec.
// See the mode in action at makerchip.com.
// Contact: steve.hoover@redwoodeda.com

// TLV Identifier prefixes.
// Note that sign is not treated separately, so "+/-" versions of numeric identifiers
// are included.
var tlvIdentifierStyle = {
  "|": "link",
  ">": "property",  // Should condition this off for > TLV 1c.
  "$": "variable",
  "$$": "variable",
  "?$": "qualifier",
  "?*": "qualifier",
  "-": "contentSeparator",
  "/": "property",
  "/-": "property",
  "@": "variableName.special",
  "@-": "variableName.special",
  "@++": "variableName.special",
  "@+=": "variableName.special",
  "@+=-": "variableName.special",
  "@--": "variableName.special",
  "@-=": "variableName.special",
  "%+": "tag",
  "%-": "tag",
  "%": "tag",
  ">>": "tag",
  "<<": "tag",
  "<>": "tag",
  "#": "tag",  // Need to choose a style for this.
  "^": "attribute",
  "^^": "attribute",
  "^!": "attribute",
  "*": "variable",
  "**": "variable",
  "\\": "keyword",
  "\"": "comment"
};

// Lines starting with these characters define scope (result in indentation).
var tlvScopePrefixChars = {
  "/": "beh-hier",
  ">": "beh-hier",
  "-": "phys-hier",
  "|": "pipe",
  "?": "when",
  "@": "stage",
  "\\": "keyword"
};
var tlvIndentUnit = 3;
var tlvIdentMatch = /^([~!@#\$%\^&\*-\+=\?\/\\\|'"<>]+)([\d\w_]*)/;  // Matches an identifier.
// Note that ':' is excluded, because of it's use in [:].
var tlvLineIndentationMatch = /^[! ] */;
var tlvCommentMatch = /^\/[\/\*]/;

const tlv = mkVerilog({
  hooks: {
    electricInput: false,

    // Return undefined for verilog tokenizing, or style for TLV token (null not used).
    // Standard CM styles are used for most formatting, but some TL-Verilog-specific highlighting
    // can be enabled with the definition of cm-tlv-* styles, including highlighting for:
    //   - M4 tokens
    //   - TLV scope indentation
    //   - Statement delimitation (enabled by tlvTrackStatements)
    token: function(stream, state) {
      var style = undefined;
      var match;  // Return value of pattern matches.

      // Set highlighting mode based on code region (TLV or SV).
      if (stream.sol() && ! state.tlvInBlockComment) {
        // Process region.
        if (stream.peek() == '\\') {
          style = "def";
          stream.skipToEnd();
          if (stream.string.match(/\\SV/)) {
            state.tlvCodeActive = false;
          } else if (stream.string.match(/\\TLV/)){
            state.tlvCodeActive = true;
          }
        }
        // Correct indentation in the face of a line prefix char.
        if (state.tlvCodeActive && stream.pos == 0 &&
            (state.indented == 0) && (match = stream.match(tlvLineIndentationMatch, false))) {
          state.indented = match[0].length;
        }

        // Compute indentation state:
        //   o Auto indentation on next line
        //   o Indentation scope styles
        var indented = state.indented;
        var depth = indented / tlvIndentUnit;
        if (depth <= state.tlvIndentationStyle.length) {
          // not deeper than current scope

          var blankline = stream.string.length == indented;
          var chPos = depth * tlvIndentUnit;
          if (chPos < stream.string.length) {
            var bodyString = stream.string.slice(chPos);
            var ch = bodyString[0];
            if (tlvScopePrefixChars[ch] && ((match = bodyString.match(tlvIdentMatch)) &&
                                            tlvIdentifierStyle[match[1]])) {
              // This line begins scope.
              // Next line gets indented one level.
              indented += tlvIndentUnit;
              // Style the next level of indentation (except non-region keyword identifiers,
              //   which are statements themselves)
              if (!(ch == "\\" && chPos > 0)) {
                state.tlvIndentationStyle[depth] = tlvScopePrefixChars[ch];
                depth++;
              }
            }
          }
          // Clear out deeper indentation levels unless line is blank.
          if (!blankline) {
            while (state.tlvIndentationStyle.length > depth) {
              state.tlvIndentationStyle.pop();
            }
          }
        }
        // Set next level of indentation.
        state.tlvNextIndent = indented;
      }

      if (state.tlvCodeActive) {

        var match;
        if (style !== undefined) ; else if (state.tlvInBlockComment) {
          // In a block comment.
          if (stream.match(/^.*?\*\//)) {
            // Exit block comment.
            state.tlvInBlockComment = false;
          } else {
            stream.skipToEnd();
          }
          style = "comment";
        } else if ((match = stream.match(tlvCommentMatch)) && !state.tlvInBlockComment) {
          // Start comment.
          if (match[0] == "//") {
            // Line comment.
            stream.skipToEnd();
          } else {
            // Block comment.
            state.tlvInBlockComment = true;
          }
          style = "comment";
        } else if (match = stream.match(tlvIdentMatch)) {
          // looks like an identifier (or identifier prefix)
          var prefix = match[1];
          var mnemonic = match[2];
          if (// is identifier prefix
            tlvIdentifierStyle.hasOwnProperty(prefix) &&
              // has mnemonic or we're at the end of the line (maybe it hasn't been typed yet)
            (mnemonic.length > 0 || stream.eol())) {
            style = tlvIdentifierStyle[prefix];
          } else {
            // Just swallow one character and try again.
            // This enables subsequent identifier match with preceding symbol character, which
            //   is legal within a statement.  (Eg, !$reset).  It also enables detection of
            //   comment start with preceding symbols.
            stream.backUp(stream.current().length - 1);
          }
        } else if (stream.match(/^\t+/)) {
          // Highlight tabs, which are illegal.
          style = "invalid";
        } else if (stream.match(/^[\[\]{}\(\);\:]+/)) {
          // [:], (), {}, ;.
          style = "meta";
        } else if (match = stream.match(/^[mM]4([\+_])?[\w\d_]*/)) {
          // m4 pre proc
          style = (match[1] == "+") ? "keyword.special" : "keyword";
        } else if (stream.match(/^ +/)){
          // Skip over spaces.
          if (stream.eol()) {
            // Trailing spaces.
            style = "error";
          }
        } else if (stream.match(/^[\w\d_]+/)) {
          // alpha-numeric token.
          style = "number";
        } else {
          // Eat the next char w/ no formatting.
          stream.next();
        }
      } else {
        if (stream.match(/^[mM]4([\w\d_]*)/)) {
          // m4 pre proc
          style = "keyword";
        }
      }
      return style;
    },

    indent: function(state) {
      return (state.tlvCodeActive == true) ? state.tlvNextIndent : -1;
    },

    startState: function(state) {
      state.tlvIndentationStyle = [];  // Styles to use for each level of indentation.
      state.tlvCodeActive = true;  // True when we're in a TLV region (and at beginning of file).
      state.tlvNextIndent = -1;    // The number of spaces to autoindent the next line if tlvCodeActive.
      state.tlvInBlockComment = false;  // True inside /**/ comment.
    }

  }
});

export { tlv, verilog };
