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✏️ Editing: verilog.js

// 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";

CodeMirror.defineMode("verilog", function(config, parserConfig) {

var indentUnit = config.indentUnit,
      statementIndentUnit = parserConfig.statementIndentUnit || indentUnit,
      dontAlignCalls = parserConfig.dontAlignCalls,
      // compilerDirectivesUseRegularIndentation - If set, Compiler directive
      // indentation follows the same rules as everything else. Otherwise if
      // false, compiler directives will track their own indentation.
      // For example, `ifdef nested inside another `ifndef will be indented,
      // but a `ifdef inside a function block may not be indented.
      compilerDirectivesUseRegularIndentation = parserConfig.compilerDirectivesUseRegularIndentation,
      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 compilerDirectiveRegex      = new RegExp(
    "^(`(?:ifdef|ifndef|elsif|else|endif|undef|undefineall|define|include|begin_keywords|celldefine|default|" +
    "nettype|end_keywords|endcelldefine|line|nounconnected_drive|pragma|resetall|timescale|unconnected_drive))\\b");
  var compilerDirectiveBeginRegex = /^(`(?:ifdef|ifndef|elsif|else))\b/;
  var compilerDirectiveEndRegex   = /^(`(?:elsif|else|endif))\b/;

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";
  openClose["macro_begin"] = "macro_end";

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 extern typedef");

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\$_]/)) {
        var cur = stream.current();
        curKeyword = cur;
        // Macros that end in _begin, are start of block and end with _end
        if (cur.startsWith("`uvm_") && cur.endsWith("_begin")) {
          var keywordClose = curKeyword.substr(0,curKeyword.length - 5) + "end";
          openClose[cur] = keywordClose;
          curPunc = "newblock";
        } else {
          stream.eatSpace();
          if (stream.peek() == '(') {
            // Check if this is a block
            curPunc = "newmacro";
          }
          var withSpace = stream.current();
          // Move the stream back before the spaces
          stream.backUp(withSpace.length - cur.length);
        }
        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";
    }
    // Event
    if (ch == '@') {
      stream.next();
      stream.eatWhile(/[@]/);
      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)) {
      curPunc = stream.current();
      return "meta";
    }

// Keywords / plain variables
    if (stream.eatWhile(/[\w\$_]/)) {
      var cur = stream.current();
      if (keywords[cur]) {
        if (openClose[cur]) {
          curPunc = "newblock";
          if (cur === "fork") {
            // Fork can be a statement instead of block in cases of:
            // "disable fork;" and "wait fork;" (trailing semicolon)
            stream.eatSpace()
            if (stream.peek() == ';') {
              curPunc = "newstatement";
            }
            stream.backUp(stream.current().length - cur.length);
          }
        }
        if (statementKeywords[cur]) {
          curPunc = "newstatement";
        }
        curKeyword = cur;
        return "keyword";
      }
      return "variable";
    }

stream.next();
    return null;
  }

// Interface
  return {

// Regex to force current line to reindent
    electricInput: buildElectricInputRegEx(),

startState: function(basecolumn) {
      var state = {
        tokenize: null,
        context: new Context((basecolumn || 0) - indentUnit, 0, "top", "top", false),
        indented: 0,
        compilerDirectiveIndented: 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") {
        if (((curPunc === "=") || (curPunc === "<=")) && !isInsideScopeKind(ctx, "assignment")) {
          // '<=' could be nonblocking assignment or lessthan-equals (which shouldn't cause indent)
          //      Search through the context to see if we are already in an assignment.
          // '=' could be inside port declaration with comma or ')' afterward, or inside for(;;) block.
          pushContext(state, stream.column() + curPunc.length, "assignment", "assignment");
          if (ctx.align == null) ctx.align = true;
        }
        return style;
      }
      if (ctx.align == null) ctx.align = true;

state.startOfLine = false;
      return style;
    },

indent: function(state, textAfter) {
      if (state.tokenize != tokenBase && state.tokenize != null) return CodeMirror.Pass;
      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 (!compilerDirectivesUseRegularIndentation && textAfter.match(compilerDirectiveRegex)) {
        if (textAfter.match(compilerDirectiveEndRegex)) {
          return state.compilerDirectiveIndented - statementIndentUnit;
        }
        return state.compilerDirectiveIndented;
      }
      if (ctx.type == "statement") return ctx.indented + (firstChar == "{" ? 0 : statementIndentUnit);
      else if ((closingBracket.test(ctx.type) || ctx.type == "assignment")
        && ctx.align && !dontAlignCalls) return ctx.column + (closing ? 0 : 1);
      else if (ctx.type == ")" && !closing) return ctx.indented + statementIndentUnit;
      else return ctx.indented + (closing ? 0 : indentUnit);
    },

blockCommentStart: "/*",
    blockCommentEnd: "*/",
    lineComment: "//",
    fold: "indent"
  };
});

CodeMirror.defineMIME("text/x-verilog", {
    name: "verilog"
  });

CodeMirror.defineMIME("text/x-systemverilog", {
    name: "verilog"
  });

// 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",
    "-": "hr",
    "/": "property",
    "/-": "property",
    "@": "variable-3",
    "@-": "variable-3",
    "@++": "variable-3",
    "@+=": "variable-3",
    "@+=-": "variable-3",
    "@--": "variable-3",
    "@-=": "variable-3",
    "%+": "tag",
    "%-": "tag",
    "%": "tag",
    ">>": "tag",
    "<<": "tag",
    "<>": "tag",
    "#": "tag",  // Need to choose a style for this.
    "^": "attribute",
    "^^": "attribute",
    "^!": "attribute",
    "*": "variable-2",
    "**": "variable-2",
    "\\": "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 tlvTrackStatements = false;
  var tlvIdentMatch = /^([~!@#\$%\^&\*-\+=\?\/\\\|'"<>]+)([\d\w_]*)/;  // Matches an identifier.
  // Note that ':' is excluded, because of it's use in [:].
  var tlvFirstLevelIndentMatch = /^[! ]  /;
  var tlvLineIndentationMatch = /^[! ] */;
  var tlvCommentMatch = /^\/[\/\*]/;

// Returns a style specific to the scope at the given indentation column.
  // Type is one of: "indent", "scope-ident", "before-scope-ident".
  function tlvScopeStyle(state, indentation, type) {
    // Begin scope.
    var depth = indentation / tlvIndentUnit;  // TODO: Pass this in instead.
    return "tlv-" + state.tlvIndentationStyle[depth] + "-" + type;
  }

// Return true if the next thing in the stream is an identifier with a mnemonic.
  function tlvIdentNext(stream) {
    var match;
    return (match = stream.match(tlvIdentMatch, false)) && match[2].length > 0;
  }

CodeMirror.defineMIME("text/x-tlv", {
    name: "verilog",

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

if (state.tlvCodeActive) {
          // Highlight as TLV.

var match;
          if (style !== undefined) {
            // Region line.
            style += " " + tlvScopeStyle(state, 0, "scope-ident")
          } else if (((stream.pos / tlvIndentUnit) < state.tlvIndentationStyle.length) &&
                     (match = stream.match(stream.sol() ? tlvFirstLevelIndentMatch : /^   /))) {
            // Indentation
            style = // make this style distinct from the previous one to prevent
                    // codemirror from combining spans
                    "tlv-indent-" + (((stream.pos % 2) == 0) ? "even" : "odd") +
                    // and style it
                    " " + tlvScopeStyle(state, stream.pos - tlvIndentUnit, "indent");
            // Style the line prefix character.
            if (match[0].charAt(0) == "!") {
              style += " tlv-alert-line-prefix";
            }
            // Place a class before a scope identifier.
            if (tlvIdentNext(stream)) {
              style += " " + tlvScopeStyle(state, stream.pos, "before-scope-ident");
            }
          } else if (state.tlvInBlockComment) {
            // In a block comment.
            if (stream.match(/^.*?\*\//)) {
              // Exit block comment.
              state.tlvInBlockComment = false;
              if (tlvTrackStatements && !stream.eol()) {
                // Anything after comment is assumed to be real statement content.
                state.statementComment = 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];
              if (stream.column() == state.indented) {
                // Begin scope.
                style += " " + tlvScopeStyle(state, stream.column(), "scope-ident")
              }
            } else {
              // Just swallow one character and try again.
              // This enables subsequent identifier match with preceding symbol character, which
              //   is legal within a statement.  (E.g., !$reset).  It also enables detection of
              //   comment start with preceding symbols.
              stream.backUp(stream.current().length - 1);
              style = "tlv-default";
            }
          } else if (stream.match(/^\t+/)) {
            // Highlight tabs, which are illegal.
            style = "tlv-tab";
          } else if (stream.match(/^[\[\]{};\:]+/)) {
            // [:], (), {}, ;.
            style = "meta";
          } else if (match = stream.match(/^[mM]4([\+_])?[\w\d_]*/)) {
            // m4 pre proc
            style = (match[1] == "+") ? "tlv-m4-plus" : "tlv-m4";
          } else if (stream.match(/^ +/)){
            // Skip over spaces.
            if (stream.eol()) {
              // Trailing spaces.
              style = "error";
            } else {
              // Non-trailing spaces.
              style = "tlv-default";
            }
          } else if (stream.match(/^[\w\d_]+/)) {
            // alpha-numeric token.
            style = "number";
          } else {
            // Eat the next char w/ no formatting.
            stream.next();
            style = "tlv-default";
          }
          if (beginStatement) {
            style += " tlv-statement";
          }
        } else {
          if (stream.match(/^[mM]4([\w\d_]*)/)) {
            // m4 pre proc
            style = "tlv-m4";
          }
        }
        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.
        if (tlvTrackStatements) {
          state.statementComment = false;  // True inside a statement's header comment.
        }
      }

}
  });
});

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