Type:
Class

This class implements a pretty printing algorithm. It finds line breaks and nice indentations for grouped structure.

By default, the class assumes that primitive elements are strings and each byte in the strings have single column in width. But it can be used for other situations by giving suitable arguments for some methods:

There are several candidate uses:

  • text formatting using proportional fonts

  • multibyte characters which has columns different to number of bytes

  • non-string formatting

Bugs

  • Box based formatting?

  • Other (better) model/algorithm?

References

Christian Lindig, Strictly Pretty, March 2000, www.st.cs.uni-sb.de/~lindig/papers/#pretty

Philip Wadler, A prettier printer, March 1998, homepages.inf.ed.ac.uk/wadler/topics/language-design.html#prettier

Author

Tanaka Akira <akr@m17n.org>

new

new(output='', maxwidth=79, newline="\n", &genspace) Class Public methods Creates

2015-04-28 10:01:57
singleline_format

singleline_format(output='', maxwidth=nil, newline=nil, genspace=nil) Class Public methods

2015-04-28 10:06:21
format

format(output='', maxwidth=79, newline="\n", genspace=lambda {|n| ' ' * n}) Class Public methods

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first?

first?() Instance Public methods first? is a predicate to test the call is a

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flush

flush() Instance Public methods outputs buffered data.

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fill_breakable

fill_breakable(sep=' ', width=sep.length) Instance Public methods This is similar

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current_group

current_group() Instance Public methods Returns the group most recently added

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text

text(obj, width=obj.length) Instance Public methods This adds obj

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breakable

breakable(sep=' ', width=sep.length) Instance Public methods This says âyou

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nest

nest(indent) Instance Public methods Increases left margin after newline with

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