{
    "nth-child": {
        "source": ":nth-child(2n+1)",
        "ast": {
            "type": "PseudoClassSelector",
            "name": "nth-child",
            "children": [
                {
                    "type": "Nth",
                    "nth": {
                        "type": "AnPlusB",
                        "a": "2",
                        "b": "1"
                    },
                    "selector": null
                }
            ]
        }
    },
    "nth-child case insensetive": {
        "source": ":Nth-Child(2n+1)",
        "ast": {
            "type": "PseudoClassSelector",
            "name": "Nth-Child",
            "children": [
                {
                    "type": "Nth",
                    "nth": {
                        "type": "AnPlusB",
                        "a": "2",
                        "b": "1"
                    },
                    "selector": null
                }
            ]
        }
    },
    "nth-last-child": {
        "source": ":nth-last-child(2n+1)",
        "ast": {
            "type": "PseudoClassSelector",
            "name": "nth-last-child",
            "children": [
                {
                    "type": "Nth",
                    "nth": {
                        "type": "AnPlusB",
                        "a": "2",
                        "b": "1"
                    },
                    "selector": null
                }
            ]
        }
    },
    "nth-last-child case insensetive": {
        "source": ":Nth-last-Child(2n+1)",
        "ast": {
            "type": "PseudoClassSelector",
            "name": "Nth-last-Child",
            "children": [
                {
                    "type": "Nth",
                    "nth": {
                        "type": "AnPlusB",
                        "a": "2",
                        "b": "1"
                    },
                    "selector": null
                }
            ]
        }
    },
    "nth-of-type": {
        "source": ":nth-of-type(2n+1)",
        "ast": {
            "type": "PseudoClassSelector",
            "name": "nth-of-type",
            "children": [
                {
                    "type": "Nth",
                    "nth": {
                        "type": "AnPlusB",
                        "a": "2",
                        "b": "1"
                    },
                    "selector": null
                }
            ]
        }
    },
    "nth-of-type case insensetive": {
        "source": ":Nth-Of-Type(2n+1)",
        "ast": {
            "type": "PseudoClassSelector",
            "name": "Nth-Of-Type",
            "children": [
                {
                    "type": "Nth",
                    "nth": {
                        "type": "AnPlusB",
                        "a": "2",
                        "b": "1"
                    },
                    "selector": null
                }
            ]
        }
    },
    "nth-last-of-type": {
        "source": ":nth-last-of-type(2n+1)",
        "ast": {
            "type": "PseudoClassSelector",
            "name": "nth-last-of-type",
            "children": [
                {
                    "type": "Nth",
                    "nth": {
                        "type": "AnPlusB",
                        "a": "2",
                        "b": "1"
                    },
                    "selector": null
                }
            ]
        }
    },
    "nth-last-of-type case insensetive": {
        "source": ":Nth-Last-Of-Type(2n+1)",
        "ast": {
            "type": "PseudoClassSelector",
            "name": "Nth-Last-Of-Type",
            "children": [
                {
                    "type": "Nth",
                    "nth": {
                        "type": "AnPlusB",
                        "a": "2",
                        "b": "1"
                    },
                    "selector": null
                }
            ]
        }
    },
    "nthselector.0 case insensitive": {
        "source": ":nth-child(2N+1)",
        "generate": ":nth-child(2n+1)",
        "ast": {
            "type": "PseudoClassSelector",
            "name": "nth-child",
            "children": [
                {
                    "type": "Nth",
                    "nth": {
                        "type": "AnPlusB",
                        "a": "2",
                        "b": "1"
                    },
                    "selector": null
                }
            ]
        }
    },
    "nthselector.1": {
        "source": ":nth-last-child(+3n-2)",
        "generate": ":nth-last-child(3n-2)",
        "ast": {
            "type": "PseudoClassSelector",
            "name": "nth-last-child",
            "children": [
                {
                    "type": "Nth",
                    "nth": {
                        "type": "AnPlusB",
                        "a": "3",
                        "b": "-2"
                    },
                    "selector": null
                }
            ]
        }
    },
    "nth.0": {
        "source": ":nth-child(10)",
        "ast": {
            "type": "PseudoClassSelector",
            "name": "nth-child",
            "children": [
                {
                    "type": "Nth",
                    "nth": {
                        "type": "AnPlusB",
                        "a": null,
                        "b": "10"
                    },
                    "selector": null
                }
            ]
        }
    },
    "nth.1": {
        "source": ":nth-child(2n)",
        "ast": {
            "type": "PseudoClassSelector",
            "name": "nth-child",
            "children": [
                {
                    "type": "Nth",
                    "nth": {
                        "type": "AnPlusB",
                        "a": "2",
                        "b": null
                    },
                    "selector": null
                }
            ]
        }
    },
    "odd keyword": {
        "source": ":nth-child(odd)",
        "ast": {
            "type": "PseudoClassSelector",
            "name": "nth-child",
            "children": [
                {
                    "type": "Nth",
                    "nth": {
                        "type": "Identifier",
                        "name": "odd"
                    },
                    "selector": null
                }
            ]
        }
    },
    "odd keyword be case insensitive": {
        "source": ":nth-child(OdD)",
        "ast": {
            "type": "PseudoClassSelector",
            "name": "nth-child",
            "children": [
                {
                    "type": "Nth",
                    "nth": {
                        "type": "Identifier",
                        "name": "OdD"
                    },
                    "selector": null
                }
            ]
        }
    },
    "even keyword": {
        "source": ":nth-child(even)",
        "ast": {
            "type": "PseudoClassSelector",
            "name": "nth-child",
            "children": [
                {
                    "type": "Nth",
                    "nth": {
                        "type": "Identifier",
                        "name": "even"
                    },
                    "selector": null
                }
            ]
        }
    },
    "even keyword should be case insensitive": {
        "source": ":nth-child(eVeN)",
        "ast": {
            "type": "PseudoClassSelector",
            "name": "nth-child",
            "children": [
                {
                    "type": "Nth",
                    "nth": {
                        "type": "Identifier",
                        "name": "eVeN"
                    },
                    "selector": null
                }
            ]
        }
    },
    "nth.4": {
        "source": ":nth-child(n)",
        "ast": {
            "type": "PseudoClassSelector",
            "name": "nth-child",
            "children": [
                {
                    "type": "Nth",
                    "nth": {
                        "type": "AnPlusB",
                        "a": "1",
                        "b": null
                    },
                    "selector": null
                }
            ]
        }
    },
    "nth.5": {
        "source": ":nth-child(-n)",
        "ast": {
            "type": "PseudoClassSelector",
            "name": "nth-child",
            "children": [
                {
                    "type": "Nth",
                    "nth": {
                        "type": "AnPlusB",
                        "a": "-1",
                        "b": null
                    },
                    "selector": null
                }
            ]
        }
    },
    "nthselector.c.0": {
        "source": ":nth-child(/*test*/2n/*test*/+/*test*/1/*test*/)",
        "generate": ":nth-child(2n+1)",
        "ast": {
            "type": "PseudoClassSelector",
            "name": "nth-child",
            "children": [
                {
                    "type": "Nth",
                    "nth": {
                        "type": "AnPlusB",
                        "a": "2",
                        "b": "1"
                    },
                    "selector": null
                }
            ]
        }
    },
    "nthselector.c.1": {
        "source": ":nth-last-child(/*test*/+3n/*test*/-/*test*/2/*test*/)",
        "generate": ":nth-last-child(3n-2)",
        "ast": {
            "type": "PseudoClassSelector",
            "name": "nth-last-child",
            "children": [
                {
                    "type": "Nth",
                    "nth": {
                        "type": "AnPlusB",
                        "a": "3",
                        "b": "-2"
                    },
                    "selector": null
                }
            ]
        }
    },
    "nthselector.s.0": {
        "source": ":nth-child(  2n  +  1  )",
        "generate": ":nth-child(2n+1)",
        "ast": {
            "type": "PseudoClassSelector",
            "name": "nth-child",
            "children": [
                {
                    "type": "Nth",
                    "nth": {
                        "type": "AnPlusB",
                        "a": "2",
                        "b": "1"
                    },
                    "selector": null
                }
            ]
        }
    },
    "nthselector.s.1": {
        "source": ":nth-last-child(  +3n  -  2  )",
        "generate": ":nth-last-child(3n-2)",
        "ast": {
            "type": "PseudoClassSelector",
            "name": "nth-last-child",
            "children": [
                {
                    "type": "Nth",
                    "nth": {
                        "type": "AnPlusB",
                        "a": "3",
                        "b": "-2"
                    },
                    "selector": null
                }
            ]
        }
    },
    "+n": {
        "source": ":nth-last-child(+n - 2)",
        "generate": ":nth-last-child(n-2)",
        "ast": {
            "type": "PseudoClassSelector",
            "name": "nth-last-child",
            "children": [
                {
                    "type": "Nth",
                    "nth": {
                        "type": "AnPlusB",
                        "a": "1",
                        "b": "-2"
                    },
                    "selector": null
                }
            ]
        }
    },
    "big numbers": {
        "source": ":nth-last-child(123456n-12345678)",
        "ast": {
            "type": "PseudoClassSelector",
            "name": "nth-last-child",
            "children": [
                {
                    "type": "Nth",
                    "nth": {
                        "type": "AnPlusB",
                        "a": "123456",
                        "b": "-12345678"
                    },
                    "selector": null
                }
            ]
        }
    },
    "of clause": {
        "source": ":nth-child(2n+1 of li,.test)",
        "ast": {
            "type": "PseudoClassSelector",
            "name": "nth-child",
            "children": [
                {
                    "type": "Nth",
                    "nth": {
                        "type": "AnPlusB",
                        "a": "2",
                        "b": "1"
                    },
                    "selector": {
                        "type": "SelectorList",
                        "children": [
                            {
                                "type": "Selector",
                                "children": [
                                    {
                                        "type": "TypeSelector",
                                        "name": "li"
                                    }
                                ]
                            },
                            {
                                "type": "Selector",
                                "children": [
                                    {
                                        "type": "ClassSelector",
                                        "name": "test"
                                    }
                                ]
                            }
                        ]
                    }
                }
            ]
        }
    },
    "error": [
        {
            "source": ":nth-child(xxx)",
            "offset": "           ^",
            "error": "N is expected"
        },
        {
            "source": ":nth-child(--test) {}",
            "offset": "            ^",
            "error": "N is expected"
        },
        {
            "source": ":nth-child(var(--test)) {}",
            "offset": "           ^",
            "error": "Unexpected input"
        },
        {
            "source": ":nth-child(3 n)",
            "offset": "             ^",
            "error": "\")\" is expected"
        },
        {
            "source": ":nth-child(+ 2n)",
            "offset": "           ^",
            "error": "Unexpected input"
        },
        {
            "source": ":nth-child(+ 2)",
            "offset": "           ^",
            "error": "Unexpected input"
        },
        {
            "source": ":nth-child(3n - +1)",
            "offset": "                ^",
            "error": "Number sign is not allowed"
        },
        {
            "source": ":nth-child(3n - -1)",
            "offset": "                ^",
            "error": "Number sign is not allowed"
        },
        {
            "source": ":nth-child(3n- +1)",
            "offset": "               ^",
            "error": "Number sign is not allowed"
        },
        {
            "source": ":nth-child(3n- -1)",
            "offset": "               ^",
            "error": "Number sign is not allowed"
        },
        {
            "source": ":nth-child(3n-2n)",
            "offset": "               ^",
            "error": "Integer is expected"
        },
        {
            "source": ":nth-child(3n + -6)",
            "offset": "                ^",
            "error": "Number sign is not allowed"
        },
        {
            "source": ":nth-child(3n - 2n)",
            "offset": "                 ^",
            "error": "Integer is expected"
        },
        {
            "source": ":nth-child(3n- 2n)",
            "offset": "                ^",
            "error": "Integer is expected"
        },
        {
            "source": ":nth-child(3n-x)",
            "offset": "              ^",
            "error": "Integer is expected"
        },
        {
            "source": ":nth-child(3n- 3.5)",
            "offset": "                ^",
            "error": "Integer is expected"
        },
        {
            "source": ":nth-child(3n 1)",
            "offset": "              ^",
            "error": "Number sign is expected"
        },
        {
            "source": ":nth-child(3nn)",
            "offset": "             ^",
            "error": "HyphenMinus is expected"
        },
        {
            "source": ":nth-child(3n- n)",
            "offset": "               ^",
            "error": "Integer is expected"
        },
        {
            "source": ":nth-child(3n + -2)",
            "offset": "                ^",
            "error": "Number sign is not allowed"
        },
        {
            "source": ":nth-child(3n+-2)",
            "offset": "              ^",
            "error": "Number sign is not allowed"
        },
        {
            "source": ":nth-child(1.3n+2)",
            "offset": "            ^",
            "error": "N is expected"
        },
        {
            "source": ":nth-child(1e3n+2)",
            "offset": "            ^",
            "error": "N is expected"
        },
        {
            "source": ":nth-child(.3n+2)",
            "offset": "           ^",
            "error": "Integer is expected"
        },
        {
            "source": ":nth-child(3n+2.1)",
            "offset": "               ^",
            "error": "Integer is expected"
        },
        {
            "source": ":nth-child(3n+2e1)",
            "offset": "               ^",
            "error": "Integer is expected"
        },
        {
            "source": ":nth-child(3n+.1)",
            "offset": "              ^",
            "error": "Integer is expected"
        },
        {
            "source": ":nth-child(2.1)",
            "offset": "            ^",
            "error": "Integer is expected"
        },
        {
            "source": ":nth-child(2e1)",
            "offset": "            ^",
            "error": "Integer is expected"
        },
        {
            "source": ":nth-child(.1)",
            "offset": "           ^",
            "error": "Integer is expected"
        },
        {
            "source": ":nth-child(+-n)",
            "offset": "            ^",
            "error": "N is expected"
        },
        {
            "source": ":nth-child(n -)",
            "offset": "              ^",
            "error": "Integer is expected"
        },
        {
            "source": ":nth-child(n +)",
            "offset": "              ^",
            "error": "Integer is expected"
        },
        {
            "source": ":nth-child(n+)",
            "offset": "             ^",
            "error": "Integer is expected"
        },
        {
            "source": ":nth-child(n-)",
            "offset": "             ^",
            "error": "Integer is expected"
        },
        {
            "source": ":nth-child(-n+)",
            "offset": "              ^",
            "error": "Integer is expected"
        },
        {
            "source": ":nth-child(-n-)",
            "offset": "              ^",
            "error": "Integer is expected"
        },
        {
            "source": ":nth-child(-n +)",
            "offset": "               ^",
            "error": "Integer is expected"
        },
        {
            "source": ":nth-child(-n -)",
            "offset": "               ^",
            "error": "Integer is expected"
        }
    ]
}