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function makeRope() {
var left = newRope("@ABCDEFGHIJKLMNO", "PQRSTUVWXYZ[\\]^_");
var right = newRope("`abcdefghijklmno", "pqrstuvwxyz{|}~");
var rope = newRope(left, right);
return {left, right, rope};
}
// Load a character from the left rope child using a constant index. The input
// to String.prototype.charAt is always rope.
function testLeftChildConstant() {
for (var i = 0; i < 200; ++i) {
var {rope} = makeRope();
var ch = rope.charAt(0);
assertEq(ch, "@");
}
}
for (var i = 0; i < 2; ++i) {
testLeftChildConstant();
}
// Load a character from the right rope child using a constant index. The input
// to String.prototype.charAt is always rope.
function testRightChildConstant() {
for (var i = 0; i < 200; ++i) {
var {rope} = makeRope();
var ch = rope.charAt(32);
assertEq(ch, "`");
}
}
for (var i = 0; i < 2; ++i) {
testRightChildConstant();
}
// Load a character from the left rope child using a variable index. The input
// to String.prototype.charAt is always rope.
function testLeftChildVariable() {
for (var i = 0; i < 200; ++i) {
var {left, rope} = makeRope();
var idx = i % left.length;
var ch = rope.charAt(idx);
assertEq(ch, String.fromCharCode(0x40 + idx));
}
}
for (var i = 0; i < 2; ++i) {
testLeftChildVariable();
}
// Load a character from the right rope child using a variable index. The input
// to String.prototype.charAt is always rope.
function testRightChildVariable() {
for (var i = 0; i < 200; ++i) {
var {left, right, rope} = makeRope();
var idx = i % right.length;
var ch = rope.charAt(left.length + idx);
assertEq(ch, String.fromCharCode(0x60 + idx));
}
}
for (var i = 0; i < 2; ++i) {
testRightChildVariable();
}
// Load all characters from both child ropes. This covers the case when the
// call to String.prototype.charAt linearizes the rope.
function testBothChildren() {
for (var i = 0; i < 200; ++i) {
var {rope} = makeRope();
for (var j = 0; j < rope.length; ++j) {
var ch = rope.charAt(j);
assertEq(ch, String.fromCharCode(0x40 + j));
}
}
}
for (var i = 0; i < 2; ++i) {
testBothChildren();
}