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Viewing file:     attributes.js (5.76 KB)      -rw-r--r--

var falseFunc = require("boolbase").falseFunc;

//https://github.com/slevithan/XRegExp/blob/master/src/xregexp.js#L469
var reChars = /[-[\]{}()*+?.,\\^$|#\s]/g;

/*
	attribute selectors
*/
var attributeRules = {
    __proto__: null,
    equals: function(next, data, options) {
        var name = data.name;
        var value = data.value;
        var adapter = options.adapter;

        if (data.ignoreCase) {
            value = value.toLowerCase();

            return function equalsIC(elem) {
                var attr = adapter.getAttributeValue(elem, name);
                return attr != null && attr.toLowerCase() === value && next(elem);
            };
        }

        return function equals(elem) {
            return adapter.getAttributeValue(elem, name) === value && next(elem);
        };
    },
    hyphen: function(next, data, options) {
        var name = data.name;
        var value = data.value;
        var len = value.length;
        var adapter = options.adapter;

        if (data.ignoreCase) {
            value = value.toLowerCase();

            return function hyphenIC(elem) {
                var attr = adapter.getAttributeValue(elem, name);
                return (
                    attr != null &&
                    (attr.length === len || attr.charAt(len) === "-") &&
                    attr.substr(0, len).toLowerCase() === value &&
                    next(elem)
                );
            };
        }

        return function hyphen(elem) {
            var attr = adapter.getAttributeValue(elem, name);
            return (
                attr != null &&
                attr.substr(0, len) === value &&
                (attr.length === len || attr.charAt(len) === "-") &&
                next(elem)
            );
        };
    },
    element: function(next, data, options) {
        var name = data.name;
        var value = data.value;
        var adapter = options.adapter;

        if (/\s/.test(value)) {
            return falseFunc;
        }

        value = value.replace(reChars, "\\$&");

        var pattern = "(?:^|\\s)" + value + "(?:$|\\s)",
            flags = data.ignoreCase ? "i" : "",
            regex = new RegExp(pattern, flags);

        return function element(elem) {
            var attr = adapter.getAttributeValue(elem, name);
            return attr != null && regex.test(attr) && next(elem);
        };
    },
    exists: function(next, data, options) {
        var name = data.name;
        var adapter = options.adapter;

        return function exists(elem) {
            return adapter.hasAttrib(elem, name) && next(elem);
        };
    },
    start: function(next, data, options) {
        var name = data.name;
        var value = data.value;
        var len = value.length;
        var adapter = options.adapter;

        if (len === 0) {
            return falseFunc;
        }

        if (data.ignoreCase) {
            value = value.toLowerCase();

            return function startIC(elem) {
                var attr = adapter.getAttributeValue(elem, name);
                return attr != null && attr.substr(0, len).toLowerCase() === value && next(elem);
            };
        }

        return function start(elem) {
            var attr = adapter.getAttributeValue(elem, name);
            return attr != null && attr.substr(0, len) === value && next(elem);
        };
    },
    end: function(next, data, options) {
        var name = data.name;
        var value = data.value;
        var len = -value.length;
        var adapter = options.adapter;

        if (len === 0) {
            return falseFunc;
        }

        if (data.ignoreCase) {
            value = value.toLowerCase();

            return function endIC(elem) {
                var attr = adapter.getAttributeValue(elem, name);
                return attr != null && attr.substr(len).toLowerCase() === value && next(elem);
            };
        }

        return function end(elem) {
            var attr = adapter.getAttributeValue(elem, name);
            return attr != null && attr.substr(len) === value && next(elem);
        };
    },
    any: function(next, data, options) {
        var name = data.name;
        var value = data.value;
        var adapter = options.adapter;

        if (value === "") {
            return falseFunc;
        }

        if (data.ignoreCase) {
            var regex = new RegExp(value.replace(reChars, "\\$&"), "i");

            return function anyIC(elem) {
                var attr = adapter.getAttributeValue(elem, name);
                return attr != null && regex.test(attr) && next(elem);
            };
        }

        return function any(elem) {
            var attr = adapter.getAttributeValue(elem, name);
            return attr != null && attr.indexOf(value) >= 0 && next(elem);
        };
    },
    not: function(next, data, options) {
        var name = data.name;
        var value = data.value;
        var adapter = options.adapter;

        if (value === "") {
            return function notEmpty(elem) {
                return !!adapter.getAttributeValue(elem, name) && next(elem);
            };
        } else if (data.ignoreCase) {
            value = value.toLowerCase();

            return function notIC(elem) {
                var attr = adapter.getAttributeValue(elem, name);
                return attr != null && attr.toLowerCase() !== value && next(elem);
            };
        }

        return function not(elem) {
            return adapter.getAttributeValue(elem, name) !== value && next(elem);
        };
    }
};

module.exports = {
    compile: function(next, data, options) {
        if (options && options.strict && (data.ignoreCase || data.action === "not")) {
            throw new Error("Unsupported attribute selector");
        }
        return attributeRules[data.action](next, data, options);
    },
    rules: attributeRules
};