Careful analysis of a text that begins with attending to individual words, sentence structure, and the order in which sentences and ideas unfold is called

It is called close reading

This is way of analyzing texts where you closely read every line instead of just rushing through the book. In it, you don't just search for symbols or themes or similar things but devote time to very small details, sometimes even including for example the order of commas or the specific choice of words for something or similar.