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263 lines (207 loc) · 6.16 KB
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// http://nathansuniversity.com/music.html
var prelude = function(expr) {
// Your code here
return { tag: 'seq',
left: { tag: 'note', pitch: 'd4', dur: 500 },
right: expr
};
};
// TESTS
var melody1 = { tag: 'note', pitch: 'c4', dur: 250 };
var melody2 =
{ tag: 'seq',
left: { tag: 'note', pitch: 'd4', dur: 500 },
right: { tag: 'note', pitch: 'c4', dur: 250 } };
var melody3 =
{ tag: 'seq',
left: { tag: 'note', pitch: 'd4', dur: 500 },
right:
{ tag: 'seq',
left: { tag: 'note', pitch: 'd4', dur: 500 },
right: { tag: 'note', pitch: 'c4', dur: 250 } } };
jshint(answer);
eval(answer);
assert_eq(prelude(melody1), melody2,
'Single note input prelude test');
assert_eq(prelude(melody2), melody3,
'Double note input prelude test');
/********************************************/
var reverse = function(expr) {
// Your code here
if (!expr || expr.tag != 'seq') {
return expr;
} else {
return {
tag: 'seq',
left: arguments.callee(expr.right),
right: arguments.callee(expr.left)
};
}
};
// TESTS
var melody1 = { tag: 'note', pitch: 'a4', dur: 125 };
var melody2 =
{ tag: 'seq',
left:
{ tag: 'seq',
left: { tag: 'note', pitch: 'a4', dur: 250 },
right: { tag: 'note', pitch: 'b4', dur: 250 } },
right:
{ tag: 'seq',
left: { tag: 'note', pitch: 'c4', dur: 500 },
right: { tag: 'note', pitch: 'd4', dur: 500 } } };
var melody3 =
{ tag: 'seq',
left:
{ tag: 'seq',
left: { tag: 'note', pitch: 'd4', dur: 500 },
right: { tag: 'note', pitch: 'c4', dur: 500 } },
right:
{ tag: 'seq',
left: { tag: 'note', pitch: 'b4', dur: 250 },
right: { tag: 'note', pitch: 'a4', dur: 250 } } };
jshint(answer);
eval(answer);
assert_eq(reverse(melody1), melody1,
'One note test');
assert_eq(reverse(melody2), melody3,
'Four note test');
assert_eq(reverse(melody3), melody2,
'Four note test backwards');
/************************************************/
var endTime = function (time, expr) {
// your code here
var sum = (function(expr) {
if (!expr) {
log(1);
return 0;
} else if (expr.tag === 'note') {
log(2);
return expr.dur;
} else {
log(3);
return arguments.callee(expr.left) + arguments.callee(expr.right);
}
})(expr);
return sum + time;
};
// or
var endTime = function (time, expr) {
// your code here
(function(expr) {
if (expr.tag === 'note') {
time += expr.dur;
} else {
arguments.callee(expr.left);
arguments.callee(expr.right);
}
})(expr);
return time;
};
/************************************************/
// maybe some helper functions
var compile = function (musexpr) {
// your code hereelse
var time = 0;
var result = [];
(function(expr) {
if (expr.tag === 'note') {
expr.start = time;
time += expr.dur;
result.push(expr);
} else {
arguments.callee(expr.left);
arguments.callee(expr.right);
}
})(musexpr);
return result;
};
/************************************************/
var playMUS = function(expr) {
playNOTE(compile(expr));
};
/************************************************/
// END TIME WITH PAR
// this is all you
var endTime = function endTime(time, expr) {
// your code here
(function(expr) {
if (expr.tag === 'note') {
log(time + "~1");
time += expr.dur;
log(time + "*1");
} else if (expr.tag === 'par') {
log(time + "~2");
var endLeft = endTime(0, expr.left);
var endRight = endTime(0, expr.right);
time += endLeft > endRight ? endLeft : endRight;
log(time + "*2");
} else {
log(time + "~3");
arguments.callee(expr.left);
arguments.callee(expr.right);
log(time + "*3");
}
})(expr);
return time;
};
var compile = function (expr) {
log(endTime(0, expr));
};
/****************************************/
// I do not like following ugly solution
// this is all you
var result = [];
var endTime = function endTime(time, expr, ref) {
// your code here
(function(expr) {
if (expr.tag === 'note') {
log(time + "~1");
expr.start = ref;
result.push(expr);
time += expr.dur;
log(time + "*1");
} else if (expr.tag === 'par') {
log(time + "~2");
var endLeft = endTime(0, expr.left, time);
var endRight = endTime(0, expr.right, time);
time += endLeft > endRight ? endLeft : endRight;
log(time + "*2");
} else {
log(time + "~3");
arguments.callee(expr.left);
arguments.callee(expr.right);
log(time + "*3");
}
})(expr);
return time;
};
var compile = function (expr) {
log(endTime(0, expr, 0));
console.dir(result);
return result;
};
// or more concise, same insane solution of function inside function inside funtion
// this is just functional style programming ?!
var compile = function (expr) {
var result = [];
(function endTime(time, expr, ref) {
// your code here
(function(expr) {
if (expr.tag === 'note') {
expr.start = time || ref;
result.push(expr);
time += expr.dur;
} else if (expr.tag === 'par') {
var endLeft = endTime(0, expr.left, time);
var endRight = endTime(0, expr.right, time);
time += endLeft > endRight ? endLeft : endRight;
} else {
arguments.callee(expr.left);
arguments.callee(expr.right);
}
})(expr);
return time;
})(0, expr, 0);
return result;
};