elm/libraries/Native/Show.js

Elm.Native.Show = {};
Elm.Native.Show.make = function(elm) {
    elm.Native = elm.Native || {};
    elm.Native.Show = elm.Native.Show || {};
    if (elm.Native.Show.values) return elm.Native.Show.values;

    var NList = Elm.Native.List.make(elm);
    var List = Elm.List.make(elm);
    var Maybe = Elm.Maybe.make(elm);
    var JS = Elm.JavaScript.make(elm);
    var Dict = Elm.Dict.make(elm);
    var Json = Elm.Json.make(elm);
    var Tuple2 = Elm.Native.Utils.make(elm).Tuple2;

    var toString = function(v) {
        var type = typeof v;
        if (type === "function") {
            var name = v.func ? v.func.name : v.name;
            return '<function' + (name === '' ? '' : ': ') + name + '>';
        } else if (type === "boolean") {
            return v ? "True" : "False";
        } else if (type === "number") {
            return v+"";
        } else if ((v instanceof String) && v.isChar) {
            return "'" + addSlashes(v) + "'";
        } else if (type === "string") {
            return '"' + addSlashes(v) + '"';
        } else if (type === "object" && '_' in v) {
            var output = [];
            for (var k in v._) {
                for (var i = v._[k].length; i--; ) {
                    output.push(k + " = " + toString(v._[k][i]));
                }
            }
            for (var k in v) {
                if (k === '_') continue;
                output.push(k + " = " + toString(v[k]));
            }
            if (output.length === 0) return "{}";
            return "{ " + output.join(", ") + " }";
        } else if (type === "object" && 'ctor' in v) {
            if (v.ctor.substring(0,6) === "_Tuple") {
                var output = [];
                for (var k in v) {
                    if (k === 'ctor') continue;
                    output.push(toString(v[k]));
                }
                return "(" + output.join(",") + ")";
            } else if (v.ctor === "::") {
                var output = '[' + toString(v._0);
                v = v._1;
                while (v.ctor === "::") {
                    output += "," + toString(v._0);
                    v = v._1;
                }
                return output + ']';
            } else if (v.ctor === "[]") {
                return "[]";
            } else if (v.ctor === "RBNode" || v.ctor === "RBEmpty") {
                var cons = F3(function(k,v,acc){return NList.Cons(Tuple2(k,v),acc)});
                var list = A3(Dict.foldr, cons, NList.Nil, v);
                var name = "Dict";
                if (list.ctor === "::" && list._0._1.ctor === "_Tuple0") {
                    name = "Set";
                    list = A2(List.map, function(x){return x._0}, list);
                }
                return name + ".fromList " + toString(list);
            } else {
                var output = "";
                for (var i in v) {
                    if (i === 'ctor') continue;
                    var str = toString(v[i]);
                    var parenless = str[0] === '{' || str[0] === '<' || str.indexOf(' ') < 0;
                    output += ' ' + (parenless ? str : '(' + str + ')');
                }
                return v.ctor + output;
            }
        }
        if (type === 'object' && 'recv' in v) return '<signal>';
        return "<internal structure>";
    };

    function addSlashes(str) {
        return str.replace(/\\/g, '\\\\')
                  .replace(/\n/g, '\\n')
                  .replace(/\t/g, '\\t')
                  .replace(/\r/g, '\\r')
                  .replace(/\v/g, '\\v')
                  .replace(/\0/g, '\\0')
                  .replace(/\'/g, "\\'")
                  .replace(/\"/g, '\\"');
    }

    return elm.Native.Show.values = { show:toString };
};