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added 400 characters in body
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C5H8NNaO4
C5H8NNaO4
  • 1.4k
  • 7
  • 18

JavaScript

Ok, so i made a shorter version that works as SSCCE, but does no longer try to parse JavaScript properly, so the reference counting might not work when put inside a more complex script.

(function run () {
    var lineOne = getLine (1), a, b, x, y, z;
    var x = {
        get state () {
            var x=/([a-z]+)\s*=\s*([a-z]+)/,c;
            return 1 + Object.keys (c = run.toString ().split ('\n').slice (0,getLine (2)).filter (function (a) {return (x.test (a))}).reduce (function (a,b,c,d) {var r=b.match (x),t=r[2];while (a[t]){t=a[t]};a[r[1]]=t;return a}, {v:0})).reduce (function (a,b) {return (c[b]=="x"?1:0) + a},0)
        }
    };
    console.log (x.state);  //1
    console.log (x.state);  //1
    y = x;
    console.log (x.state);  //2
    z = y;
    console.log (x.state);  //3    
    a = z;
    b = a;
    console.log (x.state);  //5
    a = null;
    console.log (x.state);  //4
    b = null;
    console.log (x.state);  //3
})() //1 1 2 3 5 4 3  

function getLine(n) {
   try {
      to
   } catch (dat) {
      var stack = dat.stack.split('\n');
       for (var i = 0; i < stack.length; i++) {
           if (~stack[i].indexOf ('getLine')) break;          
       }
      return dat.stack.split ('\n')[i + ~~n].match (/:(\d+)/)[1] - ~~window.hasOwnProperty ('__commandLineAPI')
   }
}

JavaScript

Ok, so i made a shorter version that works as SSCCE, but does no longer try to parse JavaScript properly, so the reference counting might not work when put inside a more complex script.

(function run () {
    var lineOne = getLine (1), a, b, x, y, z;
    var x = {
        get state () {
            var x=/([a-z]+)\s*=\s*([a-z]+)/,c;
            return 1 + Object.keys (c = run.toString ().split ('\n').slice (0,getLine (2)).filter (function (a) {return (x.test (a))}).reduce (function (a,b,c,d) {var r=b.match (x),t=r[2];while (a[t]){t=a[t]};a[r[1]]=t;return a}, {v:0})).reduce (function (a,b) {return (c[b]=="x"?1:0) + a},0)
        }
    };
    console.log (x.state);  //1
    console.log (x.state);  //1
    y = x;
    console.log (x.state);  //2
    z = y;
    console.log (x.state);  //3    
    a = z;
    b = a;
    console.log (x.state);  //5
    a = null;
    console.log (x.state);  //4
    b = null;
    console.log (x.state);  //3
})() //1 1 2 3 5 4 3

JavaScript

Ok, so i made a shorter version that works as SSCCE, but does no longer try to parse JavaScript properly, so the reference counting might not work when put inside a more complex script.

(function run () {
    var lineOne = getLine (1), a, b, x, y, z;
    var x = {
        get state () {
            var x=/([a-z]+)\s*=\s*([a-z]+)/,c;
            return 1 + Object.keys (c = run.toString ().split ('\n').slice (0,getLine (2)).filter (function (a) {return (x.test (a))}).reduce (function (a,b,c,d) {var r=b.match (x),t=r[2];while (a[t]){t=a[t]};a[r[1]]=t;return a}, {v:0})).reduce (function (a,b) {return (c[b]=="x"?1:0) + a},0)
        }
    };
    console.log (x.state);  //1
    console.log (x.state);  //1
    y = x;
    console.log (x.state);  //2
    z = y;
    console.log (x.state);  //3    
    a = z;
    b = a;
    console.log (x.state);  //5
    a = null;
    console.log (x.state);  //4
    b = null;
    console.log (x.state);  //3
})() //1 1 2 3 5 4 3  

function getLine(n) {
   try {
      to
   } catch (dat) {
      var stack = dat.stack.split('\n');
       for (var i = 0; i < stack.length; i++) {
           if (~stack[i].indexOf ('getLine')) break;          
       }
      return dat.stack.split ('\n')[i + ~~n].match (/:(\d+)/)[1] - ~~window.hasOwnProperty ('__commandLineAPI')
   }
}
deleted 27794 characters in body
Source Link
C5H8NNaO4
C5H8NNaO4
  • 1.4k
  • 7
  • 18

Ok, so i made a shorter version that works as SSCCE, but does no longer try to parse JavaScript properly, so the reference counting might not work when put inside a more complex script.

(function run () {
    var lineOne = getLine (1), a, b, x, y, z;
    var x = {
        get state () {
            var x=/([a-z]+)\s*=\s*([a-z]+)/,c;
            return 1 + findReferencesObject.keys (newc UnfinishedLexer= (run.toString ().split ('\n').processslice (0,getLine (2)).filter (function (a) {return (x.test (a))}).reduce (function (a,b,c,d) "x"{var r=b.match (x),t=r[2];while getLine(a[t]){t=a[t]};a[r[1]]=t;return a}, {v:0})).reduce (2function (a,b) -{return lineOne(c[b]=="x"?1:0); + a},0)
        }
    };

     console.log (x.state);  //1
    console.log (x.state);  //1
 
    y = x;

     console.log (x.state);  //2
 
    z = y;

     console.log (x.state);  //3
     
    a = z;
    b = a;

    console.log (x.state); //5
}

run (); //1 1 2 3 5 

function findReferences (tokens, identifierName, untilLine) {
    var vars = {},
        refs = 0,
        references = "",
        token0,token2;

    //Go through the tokenstream and look for identifiers referencing our wanted identifierName
    for (var i = 0; i < tokens.length; i++) {
        token0 = tokens [i],token2 = tokens [i+2];
        if ( token0.line <= untilLine && token0.type === "Identifier" && tokens.length > i+2 && tokens [i+1].value === "=" && token2.type === "Identifier") {
           vars[token0.value] = token2.value; 

           references = token2.value;

           while (vars [references]) {
             references = vars [references];
           }

           if (references === identifierName) {
                refs++;
           }
        }
     }
     return refs;
}

function getLine(n) {
   try {
      to
   } catch (dat) {
      var stack = dat.stack.split('\n');
       for (var i = 0; i < stack.length; i++) {
           if (~stack[i].indexOf ('getLine')) break;          
       }
      return dat.stack.split ('\n')[i + ~~n].match (/:(\d+)/)[1] - ~~window.hasOwnProperty ('__commandLineAPI')
   }
}

function UnfinishedLexer (src) {
    var Syntax,
        Token,
        RegEx;

    //http://es5.github.io/#x7.6.1
    var ReservedWords,
        Keywords,
        FutureReservedWords,
        StrictModeReservedWords,
        NullLiteral,
        BooleanLiteral;

    var Punctuators;

    Utilities = {}

    Utilities.Arr = {
        reduceBinToDec: (function (dec,el,i,src) {
            return dec + ( el * 1 << (src.length - i));
        }).bind (null, 0)
    }

    Syntax = {};
    Semantics = {};

    Syntax.is = {
        octalDigit: function (c) {
            c = c.charCodeAt (0);
            return c >= 48 && c <= 56;
        },
        decimalDigit: function (c) {
            c = c.charCodeAt (0);
            return c >= 48 && c <= 57;
        },
        hexDigit: function isHexDigit (c) {
            return !!~'0123456789abcdefABCDEF'.indexOf(c);
        },
        UnicodeLetterIdentifierStart: function (c) {
            return /[a-zA-Z$_]/.test (c) || Regex.NonAsciiIdentifierStart.test (c);
        },
        UnicodeEscapeSequence: function (c,driver) {
            var p  = driver.peek,
                iH = this.hexDigit;

                return p (1) === "u" && iH (p(2)) && iH (p(3)) && iH (p(4)) && iH((p(5)));
            ;

        },
        IdentifierStart: function isIdentifierStart (c) {
            if (c === "\\") {
                return Syntax.is.UnicodeEscapeSequence (c,driver);

            } 
            return Syntax.is.UnicodeLetterIdentifierStart (c);
        },
        NumericLiteralPart: function isNumericLiteralPart (c) {
            return this.decimalDigit (c) || c === "E";
        },
        ReservedWord: function isReservedWord (identifierName) {
            return !!~ReservedWords.indexOf (identifierName);
        },
        FunctionExpressionToken: function isFnExprToken (token) {
            return !!~FnExprTokens.indexOf (token)
        }
    }

    Regex = {
        NonAsciiIdentifierStart: new RegExp('[\xaa\xb5\xba\xc0-\xd6\xd8-\xf6\xf8-\u02c1\u02c6-\u02d1\u02e0-\u02e4\u02ec\u02ee\u0370-\u0374\u0376\u0377\u037a-\u037d\u0386\u0388-\u038a\u038c\u038e-\u03a1\u03a3-\u03f5\u03f7-\u0481\u048a-\u0527\u0531-\u0556\u0559\u0561-\u0587\u05d0-\u05ea\u05f0-\u05f2\u0620-\u064a\u066e\u066f\u0671-\u06d3\u06d5\u06e5\u06e6\u06ee\u06ef\u06fa-\u06fc\u06ff\u0710\u0712-\u072f\u074d-\u07a5\u07b1\u07ca-\u07ea\u07f4\u07f5\u07fa\u0800-\u0815\u081a\u0824\u0828\u0840-\u0858\u08a0\u08a2-\u08ac\u0904-\u0939\u093d\u0950\u0958-\u0961\u0971-\u0977\u0979-\u097f\u0985-\u098c\u098f\u0990\u0993-\u09a8\u09aa-\u09b0\u09b2\u09b6-\u09b9\u09bd\u09ce\u09dc\u09dd\u09df-\u09e1\u09f0\u09f1\u0a05-\u0a0a\u0a0f\u0a10\u0a13-\u0a28\u0a2a-\u0a30\u0a32\u0a33\u0a35\u0a36\u0a38\u0a39\u0a59-\u0a5c\u0a5e\u0a72-\u0a74\u0a85-\u0a8d\u0a8f-\u0a91\u0a93-\u0aa8\u0aaa-\u0ab0\u0ab2\u0ab3\u0ab5-\u0ab9\u0abd\u0ad0\u0ae0\u0ae1\u0b05-\u0b0c\u0b0f\u0b10\u0b13-\u0b28\u0b2a-\u0b30\u0b32\u0b33\u0b35-\u0b39\u0b3d\u0b5c\u0b5d\u0b5f-\u0b61\u0b71\u0b83\u0b85-\u0b8a\u0b8e-\u0b90\u0b92-\u0b95\u0b99\u0b9a\u0b9c\u0b9e\u0b9f\u0ba3\u0ba4\u0ba8-\u0baa\u0bae-\u0bb9\u0bd0\u0c05-\u0c0c\u0c0e-\u0c10\u0c12-\u0c28\u0c2a-\u0c33\u0c35-\u0c39\u0c3d\u0c58\u0c59\u0c60\u0c61\u0c85-\u0c8c\u0c8e-\u0c90\u0c92-\u0ca8\u0caa-\u0cb3\u0cb5-\u0cb9\u0cbd\u0cde\u0ce0\u0ce1\u0cf1\u0cf2\u0d05-\u0d0c\u0d0e-\u0d10\u0d12-\u0d3a\u0d3d\u0d4e\u0d60\u0d61\u0d7a-\u0d7f\u0d85-\u0d96\u0d9a-\u0db1\u0db3-\u0dbb\u0dbd\u0dc0-\u0dc6\u0e01-\u0e30\u0e32\u0e33\u0e40-\u0e46\u0e81\u0e82\u0e84\u0e87\u0e88\u0e8a\u0e8d\u0e94-\u0e97\u0e99-\u0e9f\u0ea1-\u0ea3\u0ea5\u0ea7\u0eaa\u0eab\u0ead-\u0eb0\u0eb2\u0eb3\u0ebd\u0ec0-\u0ec4\u0ec6\u0edc-\u0edf\u0f00\u0f40-\u0f47\u0f49-\u0f6c\u0f88-\u0f8c\u1000-\u102a\u103f\u1050-\u1055\u105a-\u105d\u1061\u1065\u1066\u106e-\u1070\u1075-\u1081\u108e\u10a0-\u10c5\u10c7\u10cd\u10d0-\u10fa\u10fc-\u1248\u124a-\u124d\u1250-\u1256\u1258\u125a-\u125d\u1260-\u1288\u128a-\u128d\u1290-\u12b0\u12b2-\u12b5\u12b8-\u12be\u12c0\u12c2-\u12c5\u12c8-\u12d6\u12d8-\u1310\u1312-\u1315\u1318-\u135a\u1380-\u138f\u13a0-\u13f4\u1401-\u166c\u166f-\u167f\u1681-\u169a\u16a0-\u16ea\u16ee-\u16f0\u1700-\u170c\u170e-\u1711\u1720-\u1731\u1740-\u1751\u1760-\u176c\u176e-\u1770\u1780-\u17b3\u17d7\u17dc\u1820-\u1877\u1880-\u18a8\u18aa\u18b0-\u18f5\u1900-\u191c\u1950-\u196d\u1970-\u1974\u1980-\u19ab\u19c1-\u19c7\u1a00-\u1a16\u1a20-\u1a54\u1aa7\u1b05-\u1b33\u1b45-\u1b4b\u1b83-\u1ba0\u1bae\u1baf\u1bba-\u1be5\u1c00-\u1c23\u1c4d-\u1c4f\u1c5a-\u1c7d\u1ce9-\u1cec\u1cee-\u1cf1\u1cf5\u1cf6\u1d00-\u1dbf\u1e00-\u1f15\u1f18-\u1f1d\u1f20-\u1f45\u1f48-\u1f4d\u1f50-\u1f57\u1f59\u1f5b\u1f5d\u1f5f-\u1f7d\u1f80-\u1fb4\u1fb6-\u1fbc\u1fbe\u1fc2-\u1fc4\u1fc6-\u1fcc\u1fd0-\u1fd3\u1fd6-\u1fdb\u1fe0-\u1fec\u1ff2-\u1ff4\u1ff6-\u1ffc\u2071\u207f\u2090-\u209c\u2102\u2107\u210a-\u2113\u2115\u2119-\u211d\u2124\u2126\u2128\u212a-\u212d\u212f-\u2139\u213c-\u213f\u2145-\u2149\u214e\u2160-\u2188\u2c00-\u2c2e\u2c30-\u2c5e\u2c60-\u2ce4\u2ceb-\u2cee\u2cf2\u2cf3\u2d00-\u2d25\u2d27\u2d2d\u2d30-\u2d67\u2d6f\u2d80-\u2d96\u2da0-\u2da6\u2da8-\u2dae\u2db0-\u2db6\u2db8-\u2dbe\u2dc0-\u2dc6\u2dc8-\u2dce\u2dd0-\u2dd6\u2dd8-\u2dde\u2e2f\u3005-\u3007\u3021-\u3029\u3031-\u3035\u3038-\u303c\u3041-\u3096\u309d-\u309f\u30a1-\u30fa\u30fc-\u30ff\u3105-\u312d\u3131-\u318e\u31a0-\u31ba\u31f0-\u31ff\u3400-\u4db5\u4e00-\u9fcc\ua000-\ua48c\ua4d0-\ua4fd\ua500-\ua60c\ua610-\ua61f\ua62a\ua62b\ua640-\ua66e\ua67f-\ua697\ua6a0-\ua6ef\ua717-\ua71f\ua722-\ua788\ua78b-\ua78e\ua790-\ua793\ua7a0-\ua7aa\ua7f8-\ua801\ua803-\ua805\ua807-\ua80a\ua80c-\ua822\ua840-\ua873\ua882-\ua8b3\ua8f2-\ua8f7\ua8fb\ua90a-\ua925\ua930-\ua946\ua960-\ua97c\ua984-\ua9b2\ua9cf\uaa00-\uaa28\uaa40-\uaa42\uaa44-\uaa4b\uaa60-\uaa76\uaa7a\uaa80-\uaaaf\uaab1\uaab5\uaab6\uaab9-\uaabd\uaac0\uaac2\uaadb-\uaadd\uaae0-\uaaea\uaaf2-\uaaf4\uab01-\uab06\uab09-\uab0e\uab11-\uab16\uab20-\uab26\uab28-\uab2e\uabc0-\uabe2\uac00-\ud7a3\ud7b0-\ud7c6\ud7cb-\ud7fb\uf900-\ufa6d\ufa70-\ufad9\ufb00-\ufb06\ufb13-\ufb17\ufb1d\ufb1f-\ufb28\ufb2a-\ufb36\ufb38-\ufb3c\ufb3e\ufb40\ufb41\ufb43\ufb44\ufb46-\ufbb1\ufbd3-\ufd3d\ufd50-\ufd8f\ufd92-\ufdc7\ufdf0-\ufdfb\ufe70-\ufe74\ufe76-\ufefc\uff21-\uff3a\uff41-\uff5a\uff66-\uffbe\uffc2-\uffc7\uffca-\uffcf\uffd2-\uffd7\uffda-\uffdc]'),
        NonAsciiIdentifierPart: new 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\uffc7\uffca-\uffcf\uffd2-\uffd7\uffda-\uffdc]')
    };

    Token = {
        IdentifierName:1,
        Punctuator:2,
        NumericLiteral:3,
        StringLiteral:4
    };


    Keywords                = ["break", "do", "instanceof", "typeof", "case", "else", "new", "var", "catch", "finally", "return", "void", "continue", "for", "switch", "while", "debugger", "function", "this", "with", "default", "if", "throw", "delete", "in", "try"];
    FutureReservedWords     = ["class", "enum", "extends", "super", "const", "export", "import"];
    StrictModeReservedWords = ["implements", "let", "private", "public", "yield", "interface", "package", "protected", "static"];
    NullLiteral             = ["null"];
    BooleanLiteral          = ["false","true"];
    ReservedWords           = [].concat.apply ([], [Keywords,FutureReservedWords,StrictModeReservedWords,NullLiteral,BooleanLiteral]);


    Punctuators             = ["{", "}", "(", ")", "[", "]", ".", ";", ",", "<", ">", "<=", ">=", "==", "!=", "===", "!==", "+", "-", "*", "%", "++", "--", "<<", ">>", ">>>", "&", "|", "^", "!", "~", "&&", "||", "?", ":", "=", "+=", "-=", "*=", "%=", "<<=", ">>=", ">>>=", "&=", "|=", "^="]
    DivPunctuators          = ["/","/="];
    AllPunctuators          = Punctuators.concat (DivPunctuators);

    FnExprTokens            = ['(', '{', '[', 'in', 'typeof', 'instanceof', 'new',
                                'return', 'case', 'delete', 'throw', 'void',
                                // assignment operators
                                '=', '+=', '-=', '*=', '/=', '%=', '<<=', '>>=', '>>>=',
                                '&=', '|=', '^=', ',',
                                // binary/unary operators
                                '+', '-', '*', '/', '%', '++', '--', '<<', '>>', '>>>', '&',
                                '|', '^', '!', '~', '&&', '||', '?', ':', '===', '==', '>=',
                                '<=', '<', '>', '!=', '!=='];

    function TokenFactory (type,test,consume) {
        return {
            type:type,
            test: function (c,driver) {

                var inst = Object.create (this),  
                    result = test.call (inst,c,driver); //The instances test function can return another TokenFactory instence
                
                if (result) {
                    inst.first = c;
                    inst.value = inst.value || "";
                    return inst;
                }
            },
            consume: consume
        }
    }

    var Whitespace = TokenFactory (
        "whitespaces",
        function (c,driver) {
            if (c === "\n") {
                driver.line++;
            }
            return  c <= " "; 
        },
        function (c,driver) {
            this.value += c;
            while (this.test (driver.step (), driver)) {};
            return this;
        }
    );

    var Comments = TokenFactory (
        "Comment",
        function (c,driver) {
            return c === "/" && driver.peek (1) === "/";
        },
        function (c,driver) {
            driver.step ();
            while (c !== "\n") {
                c = driver.step ();
                this.value += c;
            }

            return this;
        }
    )

    Whitespace.ignore = true;

    var StringLiteral = TokenFactory (
        "Literal",
        function (c) {
            return c == "'" || c=='"';   
        },
        function (c,driver) {
            while (true) {
                c = driver.step ();
                if (c === this.first) {
                    break;
                } else if (c === "\\") {
                    driver.step ();
                } else {
                    this.value += c;
                }
            }
            driver.step ();
            this.type = "StringLiteral"
            return this;
        }
    )

    var NumericLiteral = TokenFactory (
        "Literal",
        function (c) {
            return Syntax.is.decimalDigit (c) || c === ".";
        },
        function (c,driver) {
            var lookahead = "";
            if (c === ".") {
                c = driver.step ();
                this.value += ".";
            } else {
                if (c === "0") {
                    lookahead = driver.peek (1);
                    if (lookahead === "x" || lookahead === "X") {
                        return this.consumeHexLiteral (c,driver);
                    } else if (Syntax.is.octalDigit (lookahead)) {
                        return this.consumeOctalLiteral (c,driver);
                    }
                }
            }

            while (true) {
                if (Syntax.is.decimalDigit (c)) {
                    this.value += c;
                    c = driver.step ();    
                } else if (c === "E" || c === "e") {
                    this.value += c;
                    c = driver.step ();
                    
                    if ("c" === "+" || c === "-") {
                        this.value += c = driver.step ();
                    }

                    while (Syntax.is.decimalDigit (c)) {
                        this.value += c = driver.step ();
                    }

                } else {
                    break;
                }
                
            }

            this.type = "NumericLiteral";
            return this;
        }
    );

    NumericLiteral.consumeHexLiteral = function consumeHexLiteral (c,driver) {
        this.value += "0x";
        driver.step ();
        c = driver.step ();
        while (Syntax.is.hexDigit (c)) {
            this.value += c;
            c = driver.step ();
        }

        return this;
    }

    var Identifier = TokenFactory (
        "IdentifierName",
        Syntax.is.IdentifierStart,
        function (c,driver) {
            this.value += c;
            
            while (true)  {
                c = driver.step ()
                if (!(Syntax.is.IdentifierStart (c) || Syntax.is.decimalDigit (c) || Regex.NonAsciiIdentifierPart.test (c))) {
                    break;   
                }
                this.value += c;
            }
            
            if (!!~ReservedWords.indexOf (this.value)) {
                this.reserved = true;
                if (!!~Keywords.indexOf (this.value)) {
                    this.type = "Keyword";   
                } else if (!!~FutureReservedWords) {
                    this.type = "FutureReservedWord"
                }
            } else {
                this.type = "Identifier";
            }

            return this;
        }
    )

    var Punctuator = TokenFactory (
        "Punctuator",
        function (c,driver) {
            var seq = "";
            while (!!~AllPunctuators.indexOf (seq + c)) {
                seq += c;
                c = driver.peek (seq.length);  
            } 

            if (seq !== "") {
                this.value = seq;
                return true;
            }

            return false;
        },
        function (c,driver) {
            var isRegExp;
            
            if (this.value === "." && Syntax.is.decimalDigit (driver.peek (1))) {
                return NumericLiteral.consume (c,driver);    
            }

            if (this.value === "(") {
                driver.lastOpenParen = driver.tokens.length - 1;
            }

            if (this.value === "{") {
                driver.lastOpenCurlyParen = driver.tokens.length - 1;
            }

            if (this.value === "/") {
                isRegExp = RegularExpressionLiteral.test (c,driver);

                if (isRegExp) {
                    return isRegExp.consume (c,driver);
                }
            }

            driver.consume (this.value);   
            return this;
        }
    )


    var RegularExpressionLiteral = TokenFactory (
        "Literal",
        function (c,driver) {
                var lastToken = driver.tokens [ driver.tokens.length - 1],
                    anonymousFn,
                    namedFn,
                    testToken;
                if (lastToken.type === "Punctuator") {
                    if (lastToken.value === ")") {
                        testToken = driver.tokens [driver.lastOpenParen - 1];
                        if (testToken &&
                            testToken.type === "Keyword" && (
                                    testToken.value === "if" ||
                                    testToken.value === "while" ||
                                    testToken.value === "for" ||
                                    testToken.value === "with")) {
                            return true;
                        }
                        return false;
                    }

                    if (lastToken.value === "}") {
                        anonymousFn = driver.tokens[driver.lastOpenCurlyParen - 3];
                        namedFn = driver.tokens[driver.lastOpenCurlyParen - 4];

                        if (anonymousFn && anonymousFn.type === "Keyword") {
                            testToken = namedFn
                            if (!testToken) {
                                return false;
                            }
                        } else if (namedFn && namedFn.type === "Keyword") {
                            testToken = driver.tokens[driver.lastOpenCurlyParen - 5];

                            if (!testToken) {
                                return true;
                            }
                        } else {
                            return false;
                        }
                    }

                    if (testToken && Syntax.is.FunctionExpressionToken(testToken.value)) {
                        // It is an expression.
                        return false;
                    }
                    //It is a declaration
                    return true
                }

                if (lastToken.type === "Keyword") {
                    return true
                }

                return false;
        },
        function (c,driver) {
            var classMarker = false,
                terminated = false;

            c = driver.step ();

            while (driver.char < driver.src.length - 1 && c !== "/") {
                if (classMarker) {
                    if (c === "]") {
                        classMarker = false;
                        this.value += c;
                    }
                } else {
                    if (c === "\\") {
                        driver.step ();
                    } else if (c === "[") {
                        classMarker = true;
                    }

                    this.value += c;
                }
                c = driver.step ();
            }   

            this.type = "RegularExpressionLiteral";
            return this;
        }
    )

    function Driver (src) {
        this.char = -1;
        this.line = 0;
        this.src = src;
        this.tokens = [];
    }

    Driver.handlers = [Whitespace,Comments,StringLiteral,Identifier,Punctuator,NumericLiteral];

    Driver.prototype.lastOpenParen = -1;

    Driver.prototype.step = function () {
        if (this.char >= this.src.length) {
            return ("(eof)");
        }
        return this.src.charAt (++this.char); 
        
    };

    Driver.prototype.consume = function (seq) {
        for (var i = 0; i < seq.length ; i++) {
            if (this.peek (0) === seq [i]) {
                this.step ();
            } else {
                break;
            }
        }

        if (i < seq.length) {
            throw new Error("Mismatch in consume: expected: " + seq);
        }
    }
    Driver.prototype.peek = function (n) {
        return this.src.charAt (this.char + n) || "(eof)";   
    };

    Driver.prototype.process = function () {
        var c,
            j = 40,
            token;

        var test = /asd/;
        //Step to the first character at the beginning
        this.step ();
        
        do {
            //Set the character to the current processed char (the one the last consume function advanced to)
            c = this.peek (0);

            //Iterate over the handlers
            for (var i = 0,h = Driver.handlers; i < h.length; i++) {
                //Call each handlers test function (returns an object with itself as prototype, which acts as template for new tokens)
                if ( token = h[i].test (c,this)) {
                    //Since we found the right type of token, break the loop
                    break;
                } 
            }
            //If we found an eligble token
            if (token) { 
                //let it consume its relevant characters
                token = token.consume (c,this);
                token.line = this.line;
                //push the token to the list of tokens
                if (token && !token.ignore) {
                    this.tokens.push (token);
                } 
            } else {
                //If we don't find a valid token, we don't want to run in an infite loop, so
                c  = this.step (); //Skip an invalid token during development; 
            }
            
            
        } while (c !== '(eof)' && this.char < this.src.length  )
            //If we finished processing all tokens, return the list of tokens.
            return this.tokens;
    }

    return new Driver (src);
}
    console.log (x.state);  //5
    a = null;
    console.log (x.state);  //4
    b = null;
    console.log (x.state);  //3
})() //1 1 2 3 5 4 3 

function run () {
    var lineOne = getLine (1), a, b, x, y, z;
    x = {
        get state () {
            return 1 + findReferences (new UnfinishedLexer (run.toString ()).process(), "x", getLine (2) - lineOne);
        }
    };

     console.log (x.state); //1
    console.log (x.state); //1
 
    y = x;

     console.log (x.state); //2
 
    z = y;

     console.log (x.state); //3
 
    a = z;
    b = a;

    console.log (x.state); //5
}

run (); //1 1 2 3 5 

function findReferences (tokens, identifierName, untilLine) {
    var vars = {},
        refs = 0,
        references = "",
        token0,token2;

    //Go through the tokenstream and look for identifiers referencing our wanted identifierName
    for (var i = 0; i < tokens.length; i++) {
        token0 = tokens [i],token2 = tokens [i+2];
        if ( token0.line <= untilLine && token0.type === "Identifier" && tokens.length > i+2 && tokens [i+1].value === "=" && token2.type === "Identifier") {
           vars[token0.value] = token2.value; 

           references = token2.value;

           while (vars [references]) {
             references = vars [references];
           }

           if (references === identifierName) {
                refs++;
           }
        }
     }
     return refs;
}

function getLine(n) {
   try {
      to
   } catch (dat) {
      var stack = dat.stack.split('\n');
       for (var i = 0; i < stack.length; i++) {
           if (~stack[i].indexOf ('getLine')) break;          
       }
      return dat.stack.split ('\n')[i + ~~n].match (/:(\d+)/)[1] - ~~window.hasOwnProperty ('__commandLineAPI')
   }
}

function UnfinishedLexer (src) {
    var Syntax,
        Token,
        RegEx;

    //http://es5.github.io/#x7.6.1
    var ReservedWords,
        Keywords,
        FutureReservedWords,
        StrictModeReservedWords,
        NullLiteral,
        BooleanLiteral;

    var Punctuators;

    Utilities = {}

    Utilities.Arr = {
        reduceBinToDec: (function (dec,el,i,src) {
            return dec + ( el * 1 << (src.length - i));
        }).bind (null, 0)
    }

    Syntax = {};
    Semantics = {};

    Syntax.is = {
        octalDigit: function (c) {
            c = c.charCodeAt (0);
            return c >= 48 && c <= 56;
        },
        decimalDigit: function (c) {
            c = c.charCodeAt (0);
            return c >= 48 && c <= 57;
        },
        hexDigit: function isHexDigit (c) {
            return !!~'0123456789abcdefABCDEF'.indexOf(c);
        },
        UnicodeLetterIdentifierStart: function (c) {
            return /[a-zA-Z$_]/.test (c) || Regex.NonAsciiIdentifierStart.test (c);
        },
        UnicodeEscapeSequence: function (c,driver) {
            var p  = driver.peek,
                iH = this.hexDigit;

                return p (1) === "u" && iH (p(2)) && iH (p(3)) && iH (p(4)) && iH((p(5)));
            ;

        },
        IdentifierStart: function isIdentifierStart (c) {
            if (c === "\\") {
                return Syntax.is.UnicodeEscapeSequence (c,driver);

            } 
            return Syntax.is.UnicodeLetterIdentifierStart (c);
        },
        NumericLiteralPart: function isNumericLiteralPart (c) {
            return this.decimalDigit (c) || c === "E";
        },
        ReservedWord: function isReservedWord (identifierName) {
            return !!~ReservedWords.indexOf (identifierName);
        },
        FunctionExpressionToken: function isFnExprToken (token) {
            return !!~FnExprTokens.indexOf (token)
        }
    }

    Regex = {
        NonAsciiIdentifierStart: new RegExp('[\xaa\xb5\xba\xc0-\xd6\xd8-\xf6\xf8-\u02c1\u02c6-\u02d1\u02e0-\u02e4\u02ec\u02ee\u0370-\u0374\u0376\u0377\u037a-\u037d\u0386\u0388-\u038a\u038c\u038e-\u03a1\u03a3-\u03f5\u03f7-\u0481\u048a-\u0527\u0531-\u0556\u0559\u0561-\u0587\u05d0-\u05ea\u05f0-\u05f2\u0620-\u064a\u066e\u066f\u0671-\u06d3\u06d5\u06e5\u06e6\u06ee\u06ef\u06fa-\u06fc\u06ff\u0710\u0712-\u072f\u074d-\u07a5\u07b1\u07ca-\u07ea\u07f4\u07f5\u07fa\u0800-\u0815\u081a\u0824\u0828\u0840-\u0858\u08a0\u08a2-\u08ac\u0904-\u0939\u093d\u0950\u0958-\u0961\u0971-\u0977\u0979-\u097f\u0985-\u098c\u098f\u0990\u0993-\u09a8\u09aa-\u09b0\u09b2\u09b6-\u09b9\u09bd\u09ce\u09dc\u09dd\u09df-\u09e1\u09f0\u09f1\u0a05-\u0a0a\u0a0f\u0a10\u0a13-\u0a28\u0a2a-\u0a30\u0a32\u0a33\u0a35\u0a36\u0a38\u0a39\u0a59-\u0a5c\u0a5e\u0a72-\u0a74\u0a85-\u0a8d\u0a8f-\u0a91\u0a93-\u0aa8\u0aaa-\u0ab0\u0ab2\u0ab3\u0ab5-\u0ab9\u0abd\u0ad0\u0ae0\u0ae1\u0b05-\u0b0c\u0b0f\u0b10\u0b13-\u0b28\u0b2a-\u0b30\u0b32\u0b33\u0b35-\u0b39\u0b3d\u0b5c\u0b5d\u0b5f-\u0b61\u0b71\u0b83\u0b85-\u0b8a\u0b8e-\u0b90\u0b92-\u0b95\u0b99\u0b9a\u0b9c\u0b9e\u0b9f\u0ba3\u0ba4\u0ba8-\u0baa\u0bae-\u0bb9\u0bd0\u0c05-\u0c0c\u0c0e-\u0c10\u0c12-\u0c28\u0c2a-\u0c33\u0c35-\u0c39\u0c3d\u0c58\u0c59\u0c60\u0c61\u0c85-\u0c8c\u0c8e-\u0c90\u0c92-\u0ca8\u0caa-\u0cb3\u0cb5-\u0cb9\u0cbd\u0cde\u0ce0\u0ce1\u0cf1\u0cf2\u0d05-\u0d0c\u0d0e-\u0d10\u0d12-\u0d3a\u0d3d\u0d4e\u0d60\u0d61\u0d7a-\u0d7f\u0d85-\u0d96\u0d9a-\u0db1\u0db3-\u0dbb\u0dbd\u0dc0-\u0dc6\u0e01-\u0e30\u0e32\u0e33\u0e40-\u0e46\u0e81\u0e82\u0e84\u0e87\u0e88\u0e8a\u0e8d\u0e94-\u0e97\u0e99-\u0e9f\u0ea1-\u0ea3\u0ea5\u0ea7\u0eaa\u0eab\u0ead-\u0eb0\u0eb2\u0eb3\u0ebd\u0ec0-\u0ec4\u0ec6\u0edc-\u0edf\u0f00\u0f40-\u0f47\u0f49-\u0f6c\u0f88-\u0f8c\u1000-\u102a\u103f\u1050-\u1055\u105a-\u105d\u1061\u1065\u1066\u106e-\u1070\u1075-\u1081\u108e\u10a0-\u10c5\u10c7\u10cd\u10d0-\u10fa\u10fc-\u1248\u124a-\u124d\u1250-\u1256\u1258\u125a-\u125d\u1260-\u1288\u128a-\u128d\u1290-\u12b0\u12b2-\u12b5\u12b8-\u12be\u12c0\u12c2-\u12c5\u12c8-\u12d6\u12d8-\u1310\u1312-\u1315\u1318-\u135a\u1380-\u138f\u13a0-\u13f4\u1401-\u166c\u166f-\u167f\u1681-\u169a\u16a0-\u16ea\u16ee-\u16f0\u1700-\u170c\u170e-\u1711\u1720-\u1731\u1740-\u1751\u1760-\u176c\u176e-\u1770\u1780-\u17b3\u17d7\u17dc\u1820-\u1877\u1880-\u18a8\u18aa\u18b0-\u18f5\u1900-\u191c\u1950-\u196d\u1970-\u1974\u1980-\u19ab\u19c1-\u19c7\u1a00-\u1a16\u1a20-\u1a54\u1aa7\u1b05-\u1b33\u1b45-\u1b4b\u1b83-\u1ba0\u1bae\u1baf\u1bba-\u1be5\u1c00-\u1c23\u1c4d-\u1c4f\u1c5a-\u1c7d\u1ce9-\u1cec\u1cee-\u1cf1\u1cf5\u1cf6\u1d00-\u1dbf\u1e00-\u1f15\u1f18-\u1f1d\u1f20-\u1f45\u1f48-\u1f4d\u1f50-\u1f57\u1f59\u1f5b\u1f5d\u1f5f-\u1f7d\u1f80-\u1fb4\u1fb6-\u1fbc\u1fbe\u1fc2-\u1fc4\u1fc6-\u1fcc\u1fd0-\u1fd3\u1fd6-\u1fdb\u1fe0-\u1fec\u1ff2-\u1ff4\u1ff6-\u1ffc\u2071\u207f\u2090-\u209c\u2102\u2107\u210a-\u2113\u2115\u2119-\u211d\u2124\u2126\u2128\u212a-\u212d\u212f-\u2139\u213c-\u213f\u2145-\u2149\u214e\u2160-\u2188\u2c00-\u2c2e\u2c30-\u2c5e\u2c60-\u2ce4\u2ceb-\u2cee\u2cf2\u2cf3\u2d00-\u2d25\u2d27\u2d2d\u2d30-\u2d67\u2d6f\u2d80-\u2d96\u2da0-\u2da6\u2da8-\u2dae\u2db0-\u2db6\u2db8-\u2dbe\u2dc0-\u2dc6\u2dc8-\u2dce\u2dd0-\u2dd6\u2dd8-\u2dde\u2e2f\u3005-\u3007\u3021-\u3029\u3031-\u3035\u3038-\u303c\u3041-\u3096\u309d-\u309f\u30a1-\u30fa\u30fc-\u30ff\u3105-\u312d\u3131-\u318e\u31a0-\u31ba\u31f0-\u31ff\u3400-\u4db5\u4e00-\u9fcc\ua000-\ua48c\ua4d0-\ua4fd\ua500-\ua60c\ua610-\ua61f\ua62a\ua62b\ua640-\ua66e\ua67f-\ua697\ua6a0-\ua6ef\ua717-\ua71f\ua722-\ua788\ua78b-\ua78e\ua790-\ua793\ua7a0-\ua7aa\ua7f8-\ua801\ua803-\ua805\ua807-\ua80a\ua80c-\ua822\ua840-\ua873\ua882-\ua8b3\ua8f2-\ua8f7\ua8fb\ua90a-\ua925\ua930-\ua946\ua960-\ua97c\ua984-\ua9b2\ua9cf\uaa00-\uaa28\uaa40-\uaa42\uaa44-\uaa4b\uaa60-\uaa76\uaa7a\uaa80-\uaaaf\uaab1\uaab5\uaab6\uaab9-\uaabd\uaac0\uaac2\uaadb-\uaadd\uaae0-\uaaea\uaaf2-\uaaf4\uab01-\uab06\uab09-\uab0e\uab11-\uab16\uab20-\uab26\uab28-\uab2e\uabc0-\uabe2\uac00-\ud7a3\ud7b0-\ud7c6\ud7cb-\ud7fb\uf900-\ufa6d\ufa70-\ufad9\ufb00-\ufb06\ufb13-\ufb17\ufb1d\ufb1f-\ufb28\ufb2a-\ufb36\ufb38-\ufb3c\ufb3e\ufb40\ufb41\ufb43\ufb44\ufb46-\ufbb1\ufbd3-\ufd3d\ufd50-\ufd8f\ufd92-\ufdc7\ufdf0-\ufdfb\ufe70-\ufe74\ufe76-\ufefc\uff21-\uff3a\uff41-\uff5a\uff66-\uffbe\uffc2-\uffc7\uffca-\uffcf\uffd2-\uffd7\uffda-\uffdc]'),
        NonAsciiIdentifierPart: new 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\uffc7\uffca-\uffcf\uffd2-\uffd7\uffda-\uffdc]')
    };

    Token = {
        IdentifierName:1,
        Punctuator:2,
        NumericLiteral:3,
        StringLiteral:4
    };


    Keywords                = ["break", "do", "instanceof", "typeof", "case", "else", "new", "var", "catch", "finally", "return", "void", "continue", "for", "switch", "while", "debugger", "function", "this", "with", "default", "if", "throw", "delete", "in", "try"];
    FutureReservedWords     = ["class", "enum", "extends", "super", "const", "export", "import"];
    StrictModeReservedWords = ["implements", "let", "private", "public", "yield", "interface", "package", "protected", "static"];
    NullLiteral             = ["null"];
    BooleanLiteral          = ["false","true"];
    ReservedWords           = [].concat.apply ([], [Keywords,FutureReservedWords,StrictModeReservedWords,NullLiteral,BooleanLiteral]);


    Punctuators             = ["{", "}", "(", ")", "[", "]", ".", ";", ",", "<", ">", "<=", ">=", "==", "!=", "===", "!==", "+", "-", "*", "%", "++", "--", "<<", ">>", ">>>", "&", "|", "^", "!", "~", "&&", "||", "?", ":", "=", "+=", "-=", "*=", "%=", "<<=", ">>=", ">>>=", "&=", "|=", "^="]
    DivPunctuators          = ["/","/="];
    AllPunctuators          = Punctuators.concat (DivPunctuators);

    FnExprTokens            = ['(', '{', '[', 'in', 'typeof', 'instanceof', 'new',
                                'return', 'case', 'delete', 'throw', 'void',
                                // assignment operators
                                '=', '+=', '-=', '*=', '/=', '%=', '<<=', '>>=', '>>>=',
                                '&=', '|=', '^=', ',',
                                // binary/unary operators
                                '+', '-', '*', '/', '%', '++', '--', '<<', '>>', '>>>', '&',
                                '|', '^', '!', '~', '&&', '||', '?', ':', '===', '==', '>=',
                                '<=', '<', '>', '!=', '!=='];

    function TokenFactory (type,test,consume) {
        return {
            type:type,
            test: function (c,driver) {

                var inst = Object.create (this),  
                    result = test.call (inst,c,driver); //The instances test function can return another TokenFactory instence
                
                if (result) {
                    inst.first = c;
                    inst.value = inst.value || "";
                    return inst;
                }
            },
            consume: consume
        }
    }

    var Whitespace = TokenFactory (
        "whitespaces",
        function (c,driver) {
            if (c === "\n") {
                driver.line++;
            }
            return  c <= " "; 
        },
        function (c,driver) {
            this.value += c;
            while (this.test (driver.step (), driver)) {};
            return this;
        }
    );

    var Comments = TokenFactory (
        "Comment",
        function (c,driver) {
            return c === "/" && driver.peek (1) === "/";
        },
        function (c,driver) {
            driver.step ();
            while (c !== "\n") {
                c = driver.step ();
                this.value += c;
            }

            return this;
        }
    )

    Whitespace.ignore = true;

    var StringLiteral = TokenFactory (
        "Literal",
        function (c) {
            return c == "'" || c=='"';   
        },
        function (c,driver) {
            while (true) {
                c = driver.step ();
                if (c === this.first) {
                    break;
                } else if (c === "\\") {
                    driver.step ();
                } else {
                    this.value += c;
                }
            }
            driver.step ();
            this.type = "StringLiteral"
            return this;
        }
    )

    var NumericLiteral = TokenFactory (
        "Literal",
        function (c) {
            return Syntax.is.decimalDigit (c) || c === ".";
        },
        function (c,driver) {
            var lookahead = "";
            if (c === ".") {
                c = driver.step ();
                this.value += ".";
            } else {
                if (c === "0") {
                    lookahead = driver.peek (1);
                    if (lookahead === "x" || lookahead === "X") {
                        return this.consumeHexLiteral (c,driver);
                    } else if (Syntax.is.octalDigit (lookahead)) {
                        return this.consumeOctalLiteral (c,driver);
                    }
                }
            }

            while (true) {
                if (Syntax.is.decimalDigit (c)) {
                    this.value += c;
                    c = driver.step ();    
                } else if (c === "E" || c === "e") {
                    this.value += c;
                    c = driver.step ();
                    
                    if ("c" === "+" || c === "-") {
                        this.value += c = driver.step ();
                    }

                    while (Syntax.is.decimalDigit (c)) {
                        this.value += c = driver.step ();
                    }

                } else {
                    break;
                }
                
            }

            this.type = "NumericLiteral";
            return this;
        }
    );

    NumericLiteral.consumeHexLiteral = function consumeHexLiteral (c,driver) {
        this.value += "0x";
        driver.step ();
        c = driver.step ();
        while (Syntax.is.hexDigit (c)) {
            this.value += c;
            c = driver.step ();
        }

        return this;
    }

    var Identifier = TokenFactory (
        "IdentifierName",
        Syntax.is.IdentifierStart,
        function (c,driver) {
            this.value += c;
            
            while (true)  {
                c = driver.step ()
                if (!(Syntax.is.IdentifierStart (c) || Syntax.is.decimalDigit (c) || Regex.NonAsciiIdentifierPart.test (c))) {
                    break;   
                }
                this.value += c;
            }
            
            if (!!~ReservedWords.indexOf (this.value)) {
                this.reserved = true;
                if (!!~Keywords.indexOf (this.value)) {
                    this.type = "Keyword";   
                } else if (!!~FutureReservedWords) {
                    this.type = "FutureReservedWord"
                }
            } else {
                this.type = "Identifier";
            }

            return this;
        }
    )

    var Punctuator = TokenFactory (
        "Punctuator",
        function (c,driver) {
            var seq = "";
            while (!!~AllPunctuators.indexOf (seq + c)) {
                seq += c;
                c = driver.peek (seq.length);  
            } 

            if (seq !== "") {
                this.value = seq;
                return true;
            }

            return false;
        },
        function (c,driver) {
            var isRegExp;
            
            if (this.value === "." && Syntax.is.decimalDigit (driver.peek (1))) {
                return NumericLiteral.consume (c,driver);    
            }

            if (this.value === "(") {
                driver.lastOpenParen = driver.tokens.length - 1;
            }

            if (this.value === "{") {
                driver.lastOpenCurlyParen = driver.tokens.length - 1;
            }

            if (this.value === "/") {
                isRegExp = RegularExpressionLiteral.test (c,driver);

                if (isRegExp) {
                    return isRegExp.consume (c,driver);
                }
            }

            driver.consume (this.value);   
            return this;
        }
    )


    var RegularExpressionLiteral = TokenFactory (
        "Literal",
        function (c,driver) {
                var lastToken = driver.tokens [ driver.tokens.length - 1],
                    anonymousFn,
                    namedFn,
                    testToken;
                if (lastToken.type === "Punctuator") {
                    if (lastToken.value === ")") {
                        testToken = driver.tokens [driver.lastOpenParen - 1];
                        if (testToken &&
                            testToken.type === "Keyword" && (
                                    testToken.value === "if" ||
                                    testToken.value === "while" ||
                                    testToken.value === "for" ||
                                    testToken.value === "with")) {
                            return true;
                        }
                        return false;
                    }

                    if (lastToken.value === "}") {
                        anonymousFn = driver.tokens[driver.lastOpenCurlyParen - 3];
                        namedFn = driver.tokens[driver.lastOpenCurlyParen - 4];

                        if (anonymousFn && anonymousFn.type === "Keyword") {
                            testToken = namedFn
                            if (!testToken) {
                                return false;
                            }
                        } else if (namedFn && namedFn.type === "Keyword") {
                            testToken = driver.tokens[driver.lastOpenCurlyParen - 5];

                            if (!testToken) {
                                return true;
                            }
                        } else {
                            return false;
                        }
                    }

                    if (testToken && Syntax.is.FunctionExpressionToken(testToken.value)) {
                        // It is an expression.
                        return false;
                    }
                    //It is a declaration
                    return true
                }

                if (lastToken.type === "Keyword") {
                    return true
                }

                return false;
        },
        function (c,driver) {
            var classMarker = false,
                terminated = false;

            c = driver.step ();

            while (driver.char < driver.src.length - 1 && c !== "/") {
                if (classMarker) {
                    if (c === "]") {
                        classMarker = false;
                        this.value += c;
                    }
                } else {
                    if (c === "\\") {
                        driver.step ();
                    } else if (c === "[") {
                        classMarker = true;
                    }

                    this.value += c;
                }
                c = driver.step ();
            }   

            this.type = "RegularExpressionLiteral";
            return this;
        }
    )

    function Driver (src) {
        this.char = -1;
        this.line = 0;
        this.src = src;
        this.tokens = [];
    }

    Driver.handlers = [Whitespace,Comments,StringLiteral,Identifier,Punctuator,NumericLiteral];

    Driver.prototype.lastOpenParen = -1;

    Driver.prototype.step = function () {
        if (this.char >= this.src.length) {
            return ("(eof)");
        }
        return this.src.charAt (++this.char); 
        
    };

    Driver.prototype.consume = function (seq) {
        for (var i = 0; i < seq.length ; i++) {
            if (this.peek (0) === seq [i]) {
                this.step ();
            } else {
                break;
            }
        }

        if (i < seq.length) {
            throw new Error("Mismatch in consume: expected: " + seq);
        }
    }
    Driver.prototype.peek = function (n) {
        return this.src.charAt (this.char + n) || "(eof)";   
    };

    Driver.prototype.process = function () {
        var c,
            j = 40,
            token;

        var test = /asd/;
        //Step to the first character at the beginning
        this.step ();
        
        do {
            //Set the character to the current processed char (the one the last consume function advanced to)
            c = this.peek (0);

            //Iterate over the handlers
            for (var i = 0,h = Driver.handlers; i < h.length; i++) {
                //Call each handlers test function (returns an object with itself as prototype, which acts as template for new tokens)
                if ( token = h[i].test (c,this)) {
                    //Since we found the right type of token, break the loop
                    break;
                } 
            }
            //If we found an eligble token
            if (token) { 
                //let it consume its relevant characters
                token = token.consume (c,this);
                token.line = this.line;
                //push the token to the list of tokens
                if (token && !token.ignore) {
                    this.tokens.push (token);
                } 
            } else {
                //If we don't find a valid token, we don't want to run in an infite loop, so
                c  = this.step (); //Skip an invalid token during development; 
            }
            
            
        } while (c !== '(eof)' && this.char < this.src.length  )
            //If we finished processing all tokens, return the list of tokens.
            return this.tokens;
    }

    return new Driver (src);
}

Ok, so i made a shorter version that works as SSCCE, but does no longer try to parse JavaScript properly, so the reference counting might not work when put inside a more complex script.

(function run () {
    var lineOne = getLine (1), a, b, x, y, z;
    var x = {
        get state () {
            var x=/([a-z]+)\s*=\s*([a-z]+)/,c;
            return 1 + Object.keys (c = run.toString ().split ('\n').slice (0,getLine (2)).filter (function (a) {return (x.test (a))}).reduce (function (a,b,c,d) {var r=b.match (x),t=r[2];while (a[t]){t=a[t]};a[r[1]]=t;return a}, {v:0})).reduce (function (a,b) {return (c[b]=="x"?1:0) + a},0)
        }
    };
    console.log (x.state);  //1
    console.log (x.state);  //1
    y = x;
    console.log (x.state);  //2
    z = y;
    console.log (x.state);  //3    
    a = z;
    b = a;
    console.log (x.state);  //5
    a = null;
    console.log (x.state);  //4
    b = null;
    console.log (x.state);  //3
})() //1 1 2 3 5 4 3
Source Link
C5H8NNaO4
C5H8NNaO4
  • 1.4k
  • 7
  • 18

JavaScript 

function run () {
    var lineOne = getLine (1), a, b, x, y, z;
    x = {
        get state () {
            return 1 + findReferences (new UnfinishedLexer (run.toString ()).process(), "x", getLine (2) - lineOne);
        }
    };

    console.log (x.state); //1
    console.log (x.state); //1

    y = x;

    console.log (x.state); //2

    z = y;

    console.log (x.state); //3

    a = z;
    b = a;

    console.log (x.state); //5
}

run (); //1 1 2 3 5 

function findReferences (tokens, identifierName, untilLine) {
    var vars = {},
        refs = 0,
        references = "",
        token0,token2;

    //Go through the tokenstream and look for identifiers referencing our wanted identifierName
    for (var i = 0; i < tokens.length; i++) {
        token0 = tokens [i],token2 = tokens [i+2];
        if ( token0.line <= untilLine && token0.type === "Identifier" && tokens.length > i+2 && tokens [i+1].value === "=" && token2.type === "Identifier") {
           vars[token0.value] = token2.value; 

           references = token2.value;

           while (vars [references]) {
             references = vars [references];
           }

           if (references === identifierName) {
                refs++;
           }
        }
     }
     return refs;
}

function getLine(n) {
   try {
      to
   } catch (dat) {
      var stack = dat.stack.split('\n');
       for (var i = 0; i < stack.length; i++) {
           if (~stack[i].indexOf ('getLine')) break;          
       }
      return dat.stack.split ('\n')[i + ~~n].match (/:(\d+)/)[1] - ~~window.hasOwnProperty ('__commandLineAPI')
   }
}

function UnfinishedLexer (src) {
    var Syntax,
        Token,
        RegEx;

    //http://es5.github.io/#x7.6.1
    var ReservedWords,
        Keywords,
        FutureReservedWords,
        StrictModeReservedWords,
        NullLiteral,
        BooleanLiteral;

    var Punctuators;

    Utilities = {}

    Utilities.Arr = {
        reduceBinToDec: (function (dec,el,i,src) {
            return dec + ( el * 1 << (src.length - i));
        }).bind (null, 0)
    }

    Syntax = {};
    Semantics = {};

    Syntax.is = {
        octalDigit: function (c) {
            c = c.charCodeAt (0);
            return c >= 48 && c <= 56;
        },
        decimalDigit: function (c) {
            c = c.charCodeAt (0);
            return c >= 48 && c <= 57;
        },
        hexDigit: function isHexDigit (c) {
            return !!~'0123456789abcdefABCDEF'.indexOf(c);
        },
        UnicodeLetterIdentifierStart: function (c) {
            return /[a-zA-Z$_]/.test (c) || Regex.NonAsciiIdentifierStart.test (c);
        },
        UnicodeEscapeSequence: function (c,driver) {
            var p  = driver.peek,
                iH = this.hexDigit;

                return p (1) === "u" && iH (p(2)) && iH (p(3)) && iH (p(4)) && iH((p(5)));
            ;

        },
        IdentifierStart: function isIdentifierStart (c) {
            if (c === "\\") {
                return Syntax.is.UnicodeEscapeSequence (c,driver);

            } 
            return Syntax.is.UnicodeLetterIdentifierStart (c);
        },
        NumericLiteralPart: function isNumericLiteralPart (c) {
            return this.decimalDigit (c) || c === "E";
        },
        ReservedWord: function isReservedWord (identifierName) {
            return !!~ReservedWords.indexOf (identifierName);
        },
        FunctionExpressionToken: function isFnExprToken (token) {
            return !!~FnExprTokens.indexOf (token)
        }
    }

    Regex = {
        NonAsciiIdentifierStart: new RegExp('[\xaa\xb5\xba\xc0-\xd6\xd8-\xf6\xf8-\u02c1\u02c6-\u02d1\u02e0-\u02e4\u02ec\u02ee\u0370-\u0374\u0376\u0377\u037a-\u037d\u0386\u0388-\u038a\u038c\u038e-\u03a1\u03a3-\u03f5\u03f7-\u0481\u048a-\u0527\u0531-\u0556\u0559\u0561-\u0587\u05d0-\u05ea\u05f0-\u05f2\u0620-\u064a\u066e\u066f\u0671-\u06d3\u06d5\u06e5\u06e6\u06ee\u06ef\u06fa-\u06fc\u06ff\u0710\u0712-\u072f\u074d-\u07a5\u07b1\u07ca-\u07ea\u07f4\u07f5\u07fa\u0800-\u0815\u081a\u0824\u0828\u0840-\u0858\u08a0\u08a2-\u08ac\u0904-\u0939\u093d\u0950\u0958-\u0961\u0971-\u0977\u0979-\u097f\u0985-\u098c\u098f\u0990\u0993-\u09a8\u09aa-\u09b0\u09b2\u09b6-\u09b9\u09bd\u09ce\u09dc\u09dd\u09df-\u09e1\u09f0\u09f1\u0a05-\u0a0a\u0a0f\u0a10\u0a13-\u0a28\u0a2a-\u0a30\u0a32\u0a33\u0a35\u0a36\u0a38\u0a39\u0a59-\u0a5c\u0a5e\u0a72-\u0a74\u0a85-\u0a8d\u0a8f-\u0a91\u0a93-\u0aa8\u0aaa-\u0ab0\u0ab2\u0ab3\u0ab5-\u0ab9\u0abd\u0ad0\u0ae0\u0ae1\u0b05-\u0b0c\u0b0f\u0b10\u0b13-\u0b28\u0b2a-\u0b30\u0b32\u0b33\u0b35-\u0b39\u0b3d\u0b5c\u0b5d\u0b5f-\u0b61\u0b71\u0b83\u0b85-\u0b8a\u0b8e-\u0b90\u0b92-\u0b95\u0b99\u0b9a\u0b9c\u0b9e\u0b9f\u0ba3\u0ba4\u0ba8-\u0baa\u0bae-\u0bb9\u0bd0\u0c05-\u0c0c\u0c0e-\u0c10\u0c12-\u0c28\u0c2a-\u0c33\u0c35-\u0c39\u0c3d\u0c58\u0c59\u0c60\u0c61\u0c85-\u0c8c\u0c8e-\u0c90\u0c92-\u0ca8\u0caa-\u0cb3\u0cb5-\u0cb9\u0cbd\u0cde\u0ce0\u0ce1\u0cf1\u0cf2\u0d05-\u0d0c\u0d0e-\u0d10\u0d12-\u0d3a\u0d3d\u0d4e\u0d60\u0d61\u0d7a-\u0d7f\u0d85-\u0d96\u0d9a-\u0db1\u0db3-\u0dbb\u0dbd\u0dc0-\u0dc6\u0e01-\u0e30\u0e32\u0e33\u0e40-\u0e46\u0e81\u0e82\u0e84\u0e87\u0e88\u0e8a\u0e8d\u0e94-\u0e97\u0e99-\u0e9f\u0ea1-\u0ea3\u0ea5\u0ea7\u0eaa\u0eab\u0ead-\u0eb0\u0eb2\u0eb3\u0ebd\u0ec0-\u0ec4\u0ec6\u0edc-\u0edf\u0f00\u0f40-\u0f47\u0f49-\u0f6c\u0f88-\u0f8c\u1000-\u102a\u103f\u1050-\u1055\u105a-\u105d\u1061\u1065\u1066\u106e-\u1070\u1075-\u1081\u108e\u10a0-\u10c5\u10c7\u10cd\u10d0-\u10fa\u10fc-\u1248\u124a-\u124d\u1250-\u1256\u1258\u125a-\u125d\u1260-\u1288\u128a-\u128d\u1290-\u12b0\u12b2-\u12b5\u12b8-\u12be\u12c0\u12c2-\u12c5\u12c8-\u12d6\u12d8-\u1310\u1312-\u1315\u1318-\u135a\u1380-\u138f\u13a0-\u13f4\u1401-\u166c\u166f-\u167f\u1681-\u169a\u16a0-\u16ea\u16ee-\u16f0\u1700-\u170c\u170e-\u1711\u1720-\u1731\u1740-\u1751\u1760-\u176c\u176e-\u1770\u1780-\u17b3\u17d7\u17dc\u1820-\u1877\u1880-\u18a8\u18aa\u18b0-\u18f5\u1900-\u191c\u1950-\u196d\u1970-\u1974\u1980-\u19ab\u19c1-\u19c7\u1a00-\u1a16\u1a20-\u1a54\u1aa7\u1b05-\u1b33\u1b45-\u1b4b\u1b83-\u1ba0\u1bae\u1baf\u1bba-\u1be5\u1c00-\u1c23\u1c4d-\u1c4f\u1c5a-\u1c7d\u1ce9-\u1cec\u1cee-\u1cf1\u1cf5\u1cf6\u1d00-\u1dbf\u1e00-\u1f15\u1f18-\u1f1d\u1f20-\u1f45\u1f48-\u1f4d\u1f50-\u1f57\u1f59\u1f5b\u1f5d\u1f5f-\u1f7d\u1f80-\u1fb4\u1fb6-\u1fbc\u1fbe\u1fc2-\u1fc4\u1fc6-\u1fcc\u1fd0-\u1fd3\u1fd6-\u1fdb\u1fe0-\u1fec\u1ff2-\u1ff4\u1ff6-\u1ffc\u2071\u207f\u2090-\u209c\u2102\u2107\u210a-\u2113\u2115\u2119-\u211d\u2124\u2126\u2128\u212a-\u212d\u212f-\u2139\u213c-\u213f\u2145-\u2149\u214e\u2160-\u2188\u2c00-\u2c2e\u2c30-\u2c5e\u2c60-\u2ce4\u2ceb-\u2cee\u2cf2\u2cf3\u2d00-\u2d25\u2d27\u2d2d\u2d30-\u2d67\u2d6f\u2d80-\u2d96\u2da0-\u2da6\u2da8-\u2dae\u2db0-\u2db6\u2db8-\u2dbe\u2dc0-\u2dc6\u2dc8-\u2dce\u2dd0-\u2dd6\u2dd8-\u2dde\u2e2f\u3005-\u3007\u3021-\u3029\u3031-\u3035\u3038-\u303c\u3041-\u3096\u309d-\u309f\u30a1-\u30fa\u30fc-\u30ff\u3105-\u312d\u3131-\u318e\u31a0-\u31ba\u31f0-\u31ff\u3400-\u4db5\u4e00-\u9fcc\ua000-\ua48c\ua4d0-\ua4fd\ua500-\ua60c\ua610-\ua61f\ua62a\ua62b\ua640-\ua66e\ua67f-\ua697\ua6a0-\ua6ef\ua717-\ua71f\ua722-\ua788\ua78b-\ua78e\ua790-\ua793\ua7a0-\ua7aa\ua7f8-\ua801\ua803-\ua805\ua807-\ua80a\ua80c-\ua822\ua840-\ua873\ua882-\ua8b3\ua8f2-\ua8f7\ua8fb\ua90a-\ua925\ua930-\ua946\ua960-\ua97c\ua984-\ua9b2\ua9cf\uaa00-\uaa28\uaa40-\uaa42\uaa44-\uaa4b\uaa60-\uaa76\uaa7a\uaa80-\uaaaf\uaab1\uaab5\uaab6\uaab9-\uaabd\uaac0\uaac2\uaadb-\uaadd\uaae0-\uaaea\uaaf2-\uaaf4\uab01-\uab06\uab09-\uab0e\uab11-\uab16\uab20-\uab26\uab28-\uab2e\uabc0-\uabe2\uac00-\ud7a3\ud7b0-\ud7c6\ud7cb-\ud7fb\uf900-\ufa6d\ufa70-\ufad9\ufb00-\ufb06\ufb13-\ufb17\ufb1d\ufb1f-\ufb28\ufb2a-\ufb36\ufb38-\ufb3c\ufb3e\ufb40\ufb41\ufb43\ufb44\ufb46-\ufbb1\ufbd3-\ufd3d\ufd50-\ufd8f\ufd92-\ufdc7\ufdf0-\ufdfb\ufe70-\ufe74\ufe76-\ufefc\uff21-\uff3a\uff41-\uff5a\uff66-\uffbe\uffc2-\uffc7\uffca-\uffcf\uffd2-\uffd7\uffda-\uffdc]'),
        NonAsciiIdentifierPart: new 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\uffc7\uffca-\uffcf\uffd2-\uffd7\uffda-\uffdc]')
    };

    Token = {
        IdentifierName:1,
        Punctuator:2,
        NumericLiteral:3,
        StringLiteral:4
    };


    Keywords                = ["break", "do", "instanceof", "typeof", "case", "else", "new", "var", "catch", "finally", "return", "void", "continue", "for", "switch", "while", "debugger", "function", "this", "with", "default", "if", "throw", "delete", "in", "try"];
    FutureReservedWords     = ["class", "enum", "extends", "super", "const", "export", "import"];
    StrictModeReservedWords = ["implements", "let", "private", "public", "yield", "interface", "package", "protected", "static"];
    NullLiteral             = ["null"];
    BooleanLiteral          = ["false","true"];
    ReservedWords           = [].concat.apply ([], [Keywords,FutureReservedWords,StrictModeReservedWords,NullLiteral,BooleanLiteral]);


    Punctuators             = ["{", "}", "(", ")", "[", "]", ".", ";", ",", "<", ">", "<=", ">=", "==", "!=", "===", "!==", "+", "-", "*", "%", "++", "--", "<<", ">>", ">>>", "&", "|", "^", "!", "~", "&&", "||", "?", ":", "=", "+=", "-=", "*=", "%=", "<<=", ">>=", ">>>=", "&=", "|=", "^="]
    DivPunctuators          = ["/","/="];
    AllPunctuators          = Punctuators.concat (DivPunctuators);

    FnExprTokens            = ['(', '{', '[', 'in', 'typeof', 'instanceof', 'new',
                                'return', 'case', 'delete', 'throw', 'void',
                                // assignment operators
                                '=', '+=', '-=', '*=', '/=', '%=', '<<=', '>>=', '>>>=',
                                '&=', '|=', '^=', ',',
                                // binary/unary operators
                                '+', '-', '*', '/', '%', '++', '--', '<<', '>>', '>>>', '&',
                                '|', '^', '!', '~', '&&', '||', '?', ':', '===', '==', '>=',
                                '<=', '<', '>', '!=', '!=='];

    function TokenFactory (type,test,consume) {
        return {
            type:type,
            test: function (c,driver) {

                var inst = Object.create (this),  
                    result = test.call (inst,c,driver); //The instances test function can return another TokenFactory instence
                
                if (result) {
                    inst.first = c;
                    inst.value = inst.value || "";
                    return inst;
                }
            },
            consume: consume
        }
    }

    var Whitespace = TokenFactory (
        "whitespaces",
        function (c,driver) {
            if (c === "\n") {
                driver.line++;
            }
            return  c <= " "; 
        },
        function (c,driver) {
            this.value += c;
            while (this.test (driver.step (), driver)) {};
            return this;
        }
    );

    var Comments = TokenFactory (
        "Comment",
        function (c,driver) {
            return c === "/" && driver.peek (1) === "/";
        },
        function (c,driver) {
            driver.step ();
            while (c !== "\n") {
                c = driver.step ();
                this.value += c;
            }

            return this;
        }
    )

    Whitespace.ignore = true;

    var StringLiteral = TokenFactory (
        "Literal",
        function (c) {
            return c == "'" || c=='"';   
        },
        function (c,driver) {
            while (true) {
                c = driver.step ();
                if (c === this.first) {
                    break;
                } else if (c === "\\") {
                    driver.step ();
                } else {
                    this.value += c;
                }
            }
            driver.step ();
            this.type = "StringLiteral"
            return this;
        }
    )

    var NumericLiteral = TokenFactory (
        "Literal",
        function (c) {
            return Syntax.is.decimalDigit (c) || c === ".";
        },
        function (c,driver) {
            var lookahead = "";
            if (c === ".") {
                c = driver.step ();
                this.value += ".";
            } else {
                if (c === "0") {
                    lookahead = driver.peek (1);
                    if (lookahead === "x" || lookahead === "X") {
                        return this.consumeHexLiteral (c,driver);
                    } else if (Syntax.is.octalDigit (lookahead)) {
                        return this.consumeOctalLiteral (c,driver);
                    }
                }
            }

            while (true) {
                if (Syntax.is.decimalDigit (c)) {
                    this.value += c;
                    c = driver.step ();    
                } else if (c === "E" || c === "e") {
                    this.value += c;
                    c = driver.step ();
                    
                    if ("c" === "+" || c === "-") {
                        this.value += c = driver.step ();
                    }

                    while (Syntax.is.decimalDigit (c)) {
                        this.value += c = driver.step ();
                    }

                } else {
                    break;
                }
                
            }

            this.type = "NumericLiteral";
            return this;
        }
    );

    NumericLiteral.consumeHexLiteral = function consumeHexLiteral (c,driver) {
        this.value += "0x";
        driver.step ();
        c = driver.step ();
        while (Syntax.is.hexDigit (c)) {
            this.value += c;
            c = driver.step ();
        }

        return this;
    }

    var Identifier = TokenFactory (
        "IdentifierName",
        Syntax.is.IdentifierStart,
        function (c,driver) {
            this.value += c;
            
            while (true)  {
                c = driver.step ()
                if (!(Syntax.is.IdentifierStart (c) || Syntax.is.decimalDigit (c) || Regex.NonAsciiIdentifierPart.test (c))) {
                    break;   
                }
                this.value += c;
            }
            
            if (!!~ReservedWords.indexOf (this.value)) {
                this.reserved = true;
                if (!!~Keywords.indexOf (this.value)) {
                    this.type = "Keyword";   
                } else if (!!~FutureReservedWords) {
                    this.type = "FutureReservedWord"
                }
            } else {
                this.type = "Identifier";
            }

            return this;
        }
    )

    var Punctuator = TokenFactory (
        "Punctuator",
        function (c,driver) {
            var seq = "";
            while (!!~AllPunctuators.indexOf (seq + c)) {
                seq += c;
                c = driver.peek (seq.length);  
            } 

            if (seq !== "") {
                this.value = seq;
                return true;
            }

            return false;
        },
        function (c,driver) {
            var isRegExp;
            
            if (this.value === "." && Syntax.is.decimalDigit (driver.peek (1))) {
                return NumericLiteral.consume (c,driver);    
            }

            if (this.value === "(") {
                driver.lastOpenParen = driver.tokens.length - 1;
            }

            if (this.value === "{") {
                driver.lastOpenCurlyParen = driver.tokens.length - 1;
            }

            if (this.value === "/") {
                isRegExp = RegularExpressionLiteral.test (c,driver);

                if (isRegExp) {
                    return isRegExp.consume (c,driver);
                }
            }

            driver.consume (this.value);   
            return this;
        }
    )


    var RegularExpressionLiteral = TokenFactory (
        "Literal",
        function (c,driver) {
                var lastToken = driver.tokens [ driver.tokens.length - 1],
                    anonymousFn,
                    namedFn,
                    testToken;
                if (lastToken.type === "Punctuator") {
                    if (lastToken.value === ")") {
                        testToken = driver.tokens [driver.lastOpenParen - 1];
                        if (testToken &&
                            testToken.type === "Keyword" && (
                                    testToken.value === "if" ||
                                    testToken.value === "while" ||
                                    testToken.value === "for" ||
                                    testToken.value === "with")) {
                            return true;
                        }
                        return false;
                    }

                    if (lastToken.value === "}") {
                        anonymousFn = driver.tokens[driver.lastOpenCurlyParen - 3];
                        namedFn = driver.tokens[driver.lastOpenCurlyParen - 4];

                        if (anonymousFn && anonymousFn.type === "Keyword") {
                            testToken = namedFn
                            if (!testToken) {
                                return false;
                            }
                        } else if (namedFn && namedFn.type === "Keyword") {
                            testToken = driver.tokens[driver.lastOpenCurlyParen - 5];

                            if (!testToken) {
                                return true;
                            }
                        } else {
                            return false;
                        }
                    }

                    if (testToken && Syntax.is.FunctionExpressionToken(testToken.value)) {
                        // It is an expression.
                        return false;
                    }
                    //It is a declaration
                    return true
                }

                if (lastToken.type === "Keyword") {
                    return true
                }

                return false;
        },
        function (c,driver) {
            var classMarker = false,
                terminated = false;

            c = driver.step ();

            while (driver.char < driver.src.length - 1 && c !== "/") {
                if (classMarker) {
                    if (c === "]") {
                        classMarker = false;
                        this.value += c;
                    }
                } else {
                    if (c === "\\") {
                        driver.step ();
                    } else if (c === "[") {
                        classMarker = true;
                    }

                    this.value += c;
                }
                c = driver.step ();
            }   

            this.type = "RegularExpressionLiteral";
            return this;
        }
    )

    function Driver (src) {
        this.char = -1;
        this.line = 0;
        this.src = src;
        this.tokens = [];
    }

    Driver.handlers = [Whitespace,Comments,StringLiteral,Identifier,Punctuator,NumericLiteral];

    Driver.prototype.lastOpenParen = -1;

    Driver.prototype.step = function () {
        if (this.char >= this.src.length) {
            return ("(eof)");
        }
        return this.src.charAt (++this.char); 
        
    };

    Driver.prototype.consume = function (seq) {
        for (var i = 0; i < seq.length ; i++) {
            if (this.peek (0) === seq [i]) {
                this.step ();
            } else {
                break;
            }
        }

        if (i < seq.length) {
            throw new Error("Mismatch in consume: expected: " + seq);
        }
    }
    Driver.prototype.peek = function (n) {
        return this.src.charAt (this.char + n) || "(eof)";   
    };

    Driver.prototype.process = function () {
        var c,
            j = 40,
            token;

        var test = /asd/;
        //Step to the first character at the beginning
        this.step ();
        
        do {
            //Set the character to the current processed char (the one the last consume function advanced to)
            c = this.peek (0);

            //Iterate over the handlers
            for (var i = 0,h = Driver.handlers; i < h.length; i++) {
                //Call each handlers test function (returns an object with itself as prototype, which acts as template for new tokens)
                if ( token = h[i].test (c,this)) {
                    //Since we found the right type of token, break the loop
                    break;
                } 
            }
            //If we found an eligble token
            if (token) { 
                //let it consume its relevant characters
                token = token.consume (c,this);
                token.line = this.line;
                //push the token to the list of tokens
                if (token && !token.ignore) {
                    this.tokens.push (token);
                } 
            } else {
                //If we don't find a valid token, we don't want to run in an infite loop, so
                c  = this.step (); //Skip an invalid token during development; 
            }
            
            
        } while (c !== '(eof)' && this.char < this.src.length  )
            //If we finished processing all tokens, return the list of tokens.
            return this.tokens;
    }

    return new Driver (src);
}