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function makeString(from) {
var codePoints = [];
for (var i = 0; i < 16; ++i) {
codePoints.push(from + i);
}
return String.fromCodePoint(...codePoints);
}
function makeRope() {
var left = newRope(makeString(0x140), makeString(0x140 + 16));
var right = newRope(makeString(0x160), makeString(0x160 + 16));
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.codePointAt is always rope.
function testLeftChildConstant() {
for (var i = 0; i < 200; ++i) {
var {rope} = makeRope();
var ch = rope.codePointAt(0);
assertEq(ch, 0x140);
}
}
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.codePointAt is always rope.
function testRightChildConstant() {
for (var i = 0; i < 200; ++i) {
var {rope} = makeRope();
var ch = rope.codePointAt(32);
assertEq(ch, 0x160);
}
}
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.codePointAt is always rope.
function testLeftChildVariable() {
for (var i = 0; i < 200; ++i) {
var {left, rope} = makeRope();
var idx = i % left.length;
var ch = rope.codePointAt(idx);
assertEq(ch, 0x140 + 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.codePointAt 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.codePointAt(left.length + idx);
assertEq(ch, 0x160 + 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.codePointAt 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.codePointAt(j);
assertEq(ch, 0x140 + j);
}
}
}
for (var i = 0; i < 2; ++i) {
testBothChildren();
}