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function mark_diffs(expected, actual) {
var expected_lines = expected.split("\n");
var actual_lines = actual.split("\n");
var max_length = Math.max(expected_lines.length, actual_lines.length);
var expected_diff = ["code", {}];
var actual_diff = ["code", {}];
for (var i=0; i<max_length; i++) {
if (expected_lines[i] === actual_lines[i]) {
expected_diff.push(expected_lines[i] + "\n");
actual_diff.push(actual_lines[i] + "\n");
} else {
if (expected_lines[i]) {
expected_diff.push(["span", {style:"color:red"}, expected_lines[i] + "\n"]);
}
if (actual_lines[i]) {
actual_diff.push(["span", {style:"color:red"}, actual_lines[i] + "\n"]);
}
}
}
return [expected_diff, actual_diff];
}