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 |
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26 | # Used internally while pretty printing.
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27 | # See comments in PrettyPrinter._PrintDoc.
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28 | DocFragment = (MeasuredDoc mdoc, int indent, bool is_flat, Measure measure)
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29 | }
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