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Debug = debug.Debug

function Return2010() {
  return 2010;
}


// Diff it trivial: zero chunks
var NoChunkTranslator = new Debug.LiveEdit.TestApi.PosTranslator([]);

assertEquals(0, NoChunkTranslator.Translate(0));
assertEquals(10, NoChunkTranslator.Translate(10));


// Diff has one chunk
var SingleChunkTranslator = new Debug.LiveEdit.TestApi.PosTranslator([20, 30, 25]);

assertEquals(0, SingleChunkTranslator.Translate(0));
assertEquals(5, SingleChunkTranslator.Translate(5));
assertEquals(10, SingleChunkTranslator.Translate(10));
assertEquals(19, SingleChunkTranslator.Translate(19));
assertEquals(2010, SingleChunkTranslator.Translate(20, Return2010));
assertEquals(25, SingleChunkTranslator.Translate(30));
assertEquals(26, SingleChunkTranslator.Translate(31));
assertEquals(2010, SingleChunkTranslator.Translate(26, Return2010));

try {
  SingleChunkTranslator.Translate(21);
  assertTrue(false);
} catch (ignore) {
}
try {
  SingleChunkTranslator.Translate(24);
  assertTrue(false);
} catch (ignore) {
}


// Diff has several chunk (3). See the table below.

/*
chunks: (new <- old)
 10   10
 15   20

 35   40
 50   40

 70   60
 70   70
*/

var MultiChunkTranslator = new Debug.LiveEdit.TestApi.PosTranslator([10, 20, 15, 40, 40, 50, 60, 70, 70 ]);
assertEquals(5, MultiChunkTranslator.Translate(5));
assertEquals(9, MultiChunkTranslator.Translate(9));
assertEquals(2010, MultiChunkTranslator.Translate(10, Return2010));
assertEquals(15, MultiChunkTranslator.Translate(20));
assertEquals(20, MultiChunkTranslator.Translate(25));
assertEquals(34, MultiChunkTranslator.Translate(39));
assertEquals(50, MultiChunkTranslator.Translate(40, Return2010));
assertEquals(55, MultiChunkTranslator.Translate(45));
assertEquals(69, MultiChunkTranslator.Translate(59));
assertEquals(2010, MultiChunkTranslator.Translate(60, Return2010));
assertEquals(70, MultiChunkTranslator.Translate(70));
assertEquals(75, MultiChunkTranslator.Translate(75));