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Pretty printingby: Derek C. Oppen
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AbstractAn algorithm for pretty printing is given. For an input stream of length n and an output device with margin width m, the algorithm requires time O(n) and space O(m). The algorithrn is described in terms of two parallel processes; the first scans the input stream to determine the space required to print logical blocks of tokens; the second uses this information to decide where to break lines of text; the two processes communicate by means of a buffer of size O(m). The algorithm does not wait for the entire stream to be input, but begins printing as soon as it has received a linefull of input. The algorithm is easily implemented.
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