filters.js

var helpers = require('./helpers'),
    _ = require('underscore'),
    dateformat = require('./dateformat');

exports.add = function (input, addend) {
    if (_.isArray(input) && _.isArray(addend)) {
        return input.concat(addend);
    }

    if (typeof input === 'object' && typeof addend === 'object') {
        return _.extend(input, addend);
    }

    if (_.isNumber(input) && _.isNumber(addend)) {
        return input + addend;
    }

    return input + addend;
};

exports.addslashes = function (input) {
    if (typeof input === 'object') {
        _.each(input, function (value, key) {
            input[key] = exports.addslashes(value);
        });
        return input;
    }
    return input.replace(/\\/g, '\\\\').replace(/\'/g, "\\'").replace(/\"/g, '\\"');
};

exports.capitalize = function (input) {
    if (typeof input === 'object') {
        _.each(input, function (value, key) {
            input[key] = exports.capitalize(value);
        });
        return input;
    }
    return input.toString().charAt(0).toUpperCase() + input.toString().substr(1).toLowerCase();
};

exports.date = function (input, format) {
    var l = format.length,
        date = new Date(input),
        cur,
        i = 0,
        out = '';

    for (i; i < l; i += 1) {
        cur = format.charAt(i);
        if (dateformat.hasOwnProperty(cur)) {
            out += dateformat[cur](date);
        } else {
            out += cur;
        }
    }
    return out;
};

exports['default'] = function (input, def) {
    return (typeof input !== 'undefined' && (input || typeof input === 'number')) ? input : def;
};

exports.escape = exports.e = function (input, type) {
    type = type || 'html';
    if (typeof input === 'string') {
        if (type === 'js') {
            var i = 0,
                code,
                out = '';

            input = input.replace(/\\/g, '\\u005C');

            for (i; i < input.length; i += 1) {
                code = input.charCodeAt(i);
                if (code < 32) {
                    code = code.toString(16).toUpperCase();
                    code = (code.length < 2) ? '0' + code : code;
                    out += '\\u00' + code;
                } else {
                    out += input[i];
                }
            }

            return out.replace(/&/g, '\\u0026')
                .replace(/</g, '\\u003C')
                .replace(/>/g, '\\u003E')
                .replace(/\'/g, '\\u0027')
                .replace(/"/g, '\\u0022')
                .replace(/\=/g, '\\u003D')
                .replace(/-/g, '\\u002D')
                .replace(/;/g, '\\u003B');
        }
        return input.replace(/&(?!amp;|lt;|gt;|quot;|#39;)/g, '&amp;')
            .replace(/</g, '&lt;')
            .replace(/>/g, '&gt;')
            .replace(/"/g, '&quot;')
            .replace(/'/g, '&#39;');
    } else {
        return input;
    }
};

exports.first = function (input) {
    if (typeof input === 'object' && !_.isArray(input)) {
        return '';
    }

    if (typeof input === 'string') {
        return input.substr(0, 1);
    }

    return _.first(input);
};

exports.join = function (input, separator) {
    if (_.isArray(input)) {
        return input.join(separator);
    } else if (typeof input === 'object') {
        var out = [];
        _.each(input, function (value, key) {
            out.push(value);
        });
        return out.join(separator);
    } else {
        return input;
    }
};

exports.json_encode = function (input) {
    return JSON.stringify(input);
};

exports.last = function (input) {
    if (typeof input === 'object' && !_.isArray(input)) {
        return '';
    }

    if (typeof input === 'string') {
        return input.charAt(input.length - 1);
    }

    return _.last(input);
};

exports.length = function (input) {
    if (typeof input === 'object') {
        return _.keys(input).length;
    }
    return input.length;
};

exports.lower = function (input) {
    if (typeof input === 'object') {
        _.each(input, function (value, key) {
            input[key] = exports.lower(value);
        });
        return input;
    }
    return input.toString().toLowerCase();
};

exports.replace = function (input, search, replacement, flags) {
    var r = new RegExp(search, flags);
    return input.replace(r, replacement);
};

exports.reverse = function (input) {
    if (_.isArray(input)) {
        return input.reverse();
    } else {
        return input;
    }
};

exports.striptags = function (input) {
    if (typeof input === 'object') {
        _.each(input, function (value, key) {
            input[key] = exports.striptags(value);
        });
        return input;
    }
    return input.toString().replace(/(<([^>]+)>)/ig, '');
};

exports.title = function (input) {
    if (typeof input === 'object') {
        _.each(input, function (value, key) {
            input[key] = exports.title(value);
        });
        return input;
    }
    return input.toString().replace(/\w\S*/g, function (str) {
        return str.charAt(0).toUpperCase() + str.substr(1).toLowerCase();
    });
};

exports.uniq = function (input) {
    return _.uniq(input);
};

exports.upper = function (input) {
    if (typeof input === 'object') {
        _.each(input, function (value, key) {
            input[key] = exports.upper(value);
        });
        return input;
    }
    return input.toString().toUpperCase();
};

exports.url_encode = function (input) {
    return encodeURIComponent(input);
};

exports.url_decode = function (input) {
    return decodeURIComponent(input);
};