| 1 | # Pretty printing "documents". A `doc` encodes printing instructions, including
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| 2 | # choices between multiple possible layouts.
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| 3 |
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| 4 | module pretty
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| 5 | {
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| 6 | # A pretty printing document, together with a measure of its size.
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| 7 | MeasuredDoc = (doc doc, Measure measure)
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| 8 |
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| 9 | # The "size" of a document:
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| 10 | # - `flat` gives the width of the doc if printed flat (on one line).
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| 11 | # - `nonflat` gives the width until the doc's first possible newline,
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| 12 | # or -1 if no layout of the doc contains a newline.
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| 13 | Measure = (int flat, int nonflat)
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| 14 |
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| 15 | # A pretty printing "document", which encodes a set of possible layouts.
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| 16 | # The pretty printer will pick the "best" layout from among this set.
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| 17 | # See the docs on the constructors in `pretty.py` for details.
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| 18 | doc =
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| 19 | Break(str string)
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| 20 | | Text(str string)
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| 21 | | Indent(int indent, MeasuredDoc mdoc)
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| 22 | | Concat(List[MeasuredDoc] mdocs)
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| 23 | | Group(MeasuredDoc mdoc)
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| 24 | | IfFlat(MeasuredDoc flat_mdoc, MeasuredDoc nonflat_mdoc)
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| 25 | | Flat(MeasuredDoc mdoc)
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| 26 |
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| 27 | # Used internally while pretty printing.
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| 28 | # See comments in PrettyPrinter._PrintDoc.
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| 29 | DocFragment = (MeasuredDoc mdoc, int indent, bool is_flat, Measure measure)
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| 30 | }
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