netsurf/content/handlers/javascript/duktape/generics.js

/*
 * Generics for Duktape binding in NetSurf
 *
 * The result of this *MUST* be setting a NetSurf object only.
 *
 * That object will then be absorbed into the global object as a hidden
 * object which is used by the rest of the bindings.
 */

var NetSurf = {
    /* The make-proxy call for list-type objects */
    makeListProxy: function(inner) {
	return new Proxy(inner, {
	    has: function(target, key) {
		if (typeof key == 'number') {
		    return (key >= 0) && (key < target.length);
		} else {
		    return key in target;
		}
	    },
	    get: function(target, key) {
		if (typeof key == 'number') {
		    return target.item(key);
		} else {
		    return target[key];
		}
	    },
	});
    },
    consoleFormatter: function Formatter() {

	if (arguments.length == 0) {
	    return new Array("");
	} else if (arguments.length == 1) {
	    return new Array(arguments[0].toString());
	}

	const target = arguments[0];
	const current = arguments[1];

	if (typeof target !== "string") {
	    return Array.from(arguments);
	}

	const offset = target.search("%");

	if (offset == -1 || offset >= (target.length - 1)) {
	    // We've a string, but the % either doesn't exist or is
	    // at the end of it, so give up
	    return Array.from(arguments);
	}

	const specifier = target[offset + 1];

	var converted = undefined;

	if (specifier === 's') {
	    // Stringification
	    converted = current.toString();
	} else if (specifier === 'd' || specifier === 'i') {
	    converted = parseInt(current, 10).toString();
	} else if (specifier === 'f') {
	    converted = parseFloat(current).toString();
	} else if (specifier === 'o') {
	    // TODO: Objectification?
	    converted = current.toString();
	} else if (specifier === 'O') {
	    // TODO: JSONification
	    converted = current.toString();
	}

	var result = new Array();

	if (converted !== undefined) {
	    // We converted it, so we need to absorb the formatted thing
	    // and move on
	    var newtarget = "";
	    if (offset > 0) {
		newtarget = target.substring(0, offset);
	    }
	    newtarget = newtarget + converted;
	    if (offset < target.length - 2) {
		newtarget = newtarget + target.substring(offset + 2, target.length);
	    }
	    result.push(newtarget);
	} else {
	    // Undefined, so we drop this argument and move on
	    result.push(target);
	}

	var i;
	for (i = 2; i < arguments.length; i++) {
	    result.push(arguments[i]);
	}

	if (result[0].search("%") == -1) {
	    return result;
	}

	if (result.length === 1) {
	    return result;
	}

	return Formatter.apply(result);
    }
};