зеркало из https://github.com/github/ruby.git
912 строки
19 KiB
Ruby
912 строки
19 KiB
Ruby
# $Id$
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=begin
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= PrettyPrint
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The class implements pretty printing algorithm.
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It finds line breaks and nice indentations for grouped structure.
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By default, the class assumes that primitive elements are strings and
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each byte in the strings have single column in width.
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But it can be used for other situations
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by giving suitable arguments for some methods:
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newline object and space generation block for (({PrettyPrint.new})),
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optional width argument for (({PrettyPrint#text})),
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(({PrettyPrint#breakable})), etc.
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There are several candidates to use them:
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text formatting using proportional fonts,
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multibyte characters which has columns different to number of bytes,
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non-string formatting, etc.
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== class methods
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--- PrettyPrint.new([output[, maxwidth[, newline]]]) [{|width| ...}]
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creates a buffer for pretty printing.
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((|output|)) is an output target.
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If it is not specified, (({''})) is assumed.
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It should have a (({<<})) method which accepts
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the first argument ((|obj|)) of (({PrettyPrint#text})),
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the first argument ((|sep|)) of (({PrettyPrint#breakable})),
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the first argument ((|newline|)) of (({PrettyPrint.new})),
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and
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the result of a given block for (({PrettyPrint.new})).
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((|maxwidth|)) specifies maximum line length.
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If it is not specified, 79 is assumed.
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However actual outputs may overflow ((|maxwidth|)) if
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long non-breakable texts are provided.
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((|newline|)) is used for line breaks.
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(({"\n"})) is used if it is not specified.
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The block is used to generate spaces.
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(({{|width| ' ' * width}})) is used if it is not given.
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--- PrettyPrint.format([output[, maxwidth[, newline[, genspace]]]]) {|q| ...}
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is a convenience method which is same as follows:
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begin
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q = PrettyPrint.new(output, maxwidth, newline, &genspace)
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...
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q.flush
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output
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end
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--- PrettyPrint.singleline_format([output[, maxwidth[, newline[, genspace]]]]) {|q| ...}
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is similar to (({PrettyPrint.format})) but the result has no breaks.
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((|maxwidth|)), ((|newline|)) and ((|genspace|)) are ignored.
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The invocation of (({breakable})) in the block doesn't break a line and
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treated as just an invocation of (({text})).
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== methods
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--- text(obj[, width])
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adds ((|obj|)) as a text of ((|width|)) columns in width.
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If ((|width|)) is not specified, (({((|obj|)).length})) is used.
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--- breakable([sep[, width]])
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tells "you can break a line here if necessary", and a
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((|width|))-column text ((|sep|)) is inserted if a line is not
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broken at the point.
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If ((|sep|)) is not specified, (({" "})) is used.
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If ((|width|)) is not specified, (({((|sep|)).length})) is used.
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You will have to specify this when ((|sep|)) is a multibyte
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character, for example.
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--- nest(indent) {...}
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increases left margin after newline with ((|indent|)) for line breaks added
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in the block.
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--- group([indent[, open_obj[, close_obj[, open_width[, close_width]]]]]) {...}
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groups line break hints added in the block.
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The line break hints are all to be breaked or not.
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If ((|indent|)) is specified, the method call is regarded as nested by
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(({nest(((|indent|))) { ... }})).
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If ((|open_obj|)) is specified, (({text open_obj, open_width})) is called
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at first.
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If ((|close_obj|)) is specified, (({text close_obj, close_width})) is
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called at last.
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--- flush
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outputs buffered data.
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--- first?
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is a predicate to test the call is a first call to (({first?})) with
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current group.
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It is useful to format comma separated values as:
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q.group(1, '[', ']') {
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xxx.each {|yyy|
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unless q.first?
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q.text ','
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q.breakable
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end
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... pretty printing yyy ...
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}
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}
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== Bugs
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* Box based formatting? Other (better) model/algorithm?
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== References
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Christian Lindig, Strictly Pretty, March 2000,
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((<URL:http://www.gaertner.de/~lindig/papers/strictly-pretty.html>))
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Philip Wadler, A prettier printer, March 1998,
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((<URL:http://www.research.avayalabs.com/user/wadler/topics/recent.html#prettier>))
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== AUTHOR
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Tanaka Akira <akr@m17n.org>
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=end
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class PrettyPrint
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def PrettyPrint.format(output='', maxwidth=79, newline="\n", genspace=lambda {|n| ' ' * n})
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q = PrettyPrint.new(output, maxwidth, newline, &genspace)
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yield q
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q.flush
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output
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end
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def PrettyPrint.singleline_format(output='', maxwidth=nil, newline=nil, genspace=nil)
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q = SingleLine.new(output)
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yield q
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output
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end
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def initialize(output='', maxwidth=79, newline="\n", &genspace)
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@output = output
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@maxwidth = maxwidth
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@newline = newline
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@genspace = genspace || lambda {|n| ' ' * n}
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@output_width = 0
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@buffer_width = 0
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@buffer = []
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root_group = Group.new(0)
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@group_stack = [root_group]
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@group_queue = GroupQueue.new(root_group)
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@indent = 0
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end
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attr_reader :output, :maxwidth, :newline, :genspace
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attr_reader :indent, :group_queue
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def current_group
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@group_stack.last
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end
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def first?
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current_group.first?
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end
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def break_outmost_groups
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while @maxwidth < @output_width + @buffer_width
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return unless group = @group_queue.deq
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until group.breakables.empty?
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data = @buffer.shift
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@output_width = data.output(@output, @output_width)
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@buffer_width -= data.width
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end
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while !@buffer.empty? && Text === @buffer.first
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text = @buffer.shift
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@output_width = text.output(@output, @output_width)
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@buffer_width -= text.width
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end
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end
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end
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def text(obj, width=obj.length)
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if @buffer.empty?
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@output << obj
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@output_width += width
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else
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text = @buffer.last
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unless Text === text
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text = Text.new
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@buffer << text
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end
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text.add(obj, width)
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@buffer_width += width
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break_outmost_groups
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end
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end
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def fill_breakable(sep=' ', width=sep.length)
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group { breakable sep, width }
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end
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def breakable(sep=' ', width=sep.length)
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group = @group_stack.last
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if group.break?
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flush
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@output << @newline
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@output << @genspace.call(@indent)
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@output_width = @indent
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@buffer_width = 0
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else
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@buffer << Breakable.new(sep, width, self)
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@buffer_width += width
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break_outmost_groups
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end
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end
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def group(indent=0, open_obj='', close_obj='', open_width=open_obj.length, close_width=close_obj.length)
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text open_obj, open_width
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group_sub {
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nest(indent) {
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yield
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}
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}
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text close_obj, close_width
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end
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def group_sub
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group = Group.new(@group_stack.last.depth + 1)
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@group_stack.push group
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@group_queue.enq group
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begin
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yield
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ensure
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@group_stack.pop
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if group.breakables.empty?
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@group_queue.delete group
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end
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end
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end
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def nest(indent)
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@indent += indent
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begin
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yield
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ensure
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@indent -= indent
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end
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end
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def flush
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@buffer.each {|data|
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@output_width = data.output(@output, @output_width)
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}
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@buffer.clear
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@buffer_width = 0
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end
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class Text
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def initialize
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@objs = []
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@width = 0
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end
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attr_reader :width
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def output(out, output_width)
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@objs.each {|obj| out << obj}
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output_width + @width
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end
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def add(obj, width)
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@objs << obj
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@width += width
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end
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end
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class Breakable
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def initialize(sep, width, q)
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@obj = sep
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@width = width
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@pp = q
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@indent = q.indent
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@group = q.current_group
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@group.breakables.push self
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end
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attr_reader :obj, :width, :indent
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def output(out, output_width)
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@group.breakables.shift
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if @group.break?
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out << @pp.newline
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out << @pp.genspace.call(@indent)
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@indent
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else
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@pp.group_queue.delete @group if @group.breakables.empty?
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out << @obj
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output_width + @width
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end
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end
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end
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class Group
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def initialize(depth)
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@depth = depth
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@breakables = []
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@break = false
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end
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attr_reader :depth, :breakables
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def break
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@break = true
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end
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def break?
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@break
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end
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def first?
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if defined? @first
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false
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else
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@first = false
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true
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end
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end
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end
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class GroupQueue
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def initialize(*groups)
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@queue = []
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groups.each {|g| enq g}
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end
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def enq(group)
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depth = group.depth
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@queue << [] until depth < @queue.length
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@queue[depth] << group
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end
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def deq
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@queue.each {|gs|
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(gs.length-1).downto(0) {|i|
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unless gs[i].breakables.empty?
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group = gs.slice!(i, 1).first
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group.break
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return group
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end
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}
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gs.each {|group| group.break}
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gs.clear
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}
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return nil
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end
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def delete(group)
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@queue[group.depth].delete(group)
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end
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end
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class SingleLine
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def initialize(output, maxwidth=nil, newline=nil)
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@output = output
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@first = [true]
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end
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def text(obj, width=nil)
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@output << obj
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end
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def breakable(sep=' ', width=nil)
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@output << sep
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end
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def nest(indent)
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yield
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end
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def group(indent=nil, open_obj='', close_obj='', open_width=nil, close_width=nil)
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@first.push true
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@output << open_obj
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yield
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@output << close_obj
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@first.pop
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end
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def flush
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end
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def first?
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result = @first[-1]
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@first[-1] = false
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result
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end
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end
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end
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if __FILE__ == $0
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require 'test/unit'
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class WadlerExample < Test::Unit::TestCase
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def setup
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@tree = Tree.new("aaaa", Tree.new("bbbbb", Tree.new("ccc"),
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Tree.new("dd")),
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Tree.new("eee"),
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Tree.new("ffff", Tree.new("gg"),
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Tree.new("hhh"),
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Tree.new("ii")))
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end
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def hello(width)
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PrettyPrint.format('', width) {|hello|
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hello.group {
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hello.group {
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hello.group {
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hello.group {
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hello.text 'hello'
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hello.breakable; hello.text 'a'
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}
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hello.breakable; hello.text 'b'
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}
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hello.breakable; hello.text 'c'
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}
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hello.breakable; hello.text 'd'
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}
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}
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end
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def test_hello_00_06
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expected = <<'End'.chomp
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hello
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a
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b
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c
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d
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End
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assert_equal(expected, hello(0))
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assert_equal(expected, hello(6))
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end
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def test_hello_07_08
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expected = <<'End'.chomp
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hello a
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b
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c
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d
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End
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assert_equal(expected, hello(7))
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assert_equal(expected, hello(8))
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end
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def test_hello_09_10
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expected = <<'End'.chomp
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hello a b
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c
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d
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End
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out = hello(9); assert_equal(expected, out)
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out = hello(10); assert_equal(expected, out)
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end
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def test_hello_11_12
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expected = <<'End'.chomp
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hello a b c
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d
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End
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assert_equal(expected, hello(11))
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assert_equal(expected, hello(12))
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end
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def test_hello_13
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expected = <<'End'.chomp
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hello a b c d
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End
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assert_equal(expected, hello(13))
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end
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def tree(width)
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PrettyPrint.format('', width) {|q| @tree.show(q)}
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end
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def test_tree_00_19
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expected = <<'End'.chomp
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aaaa[bbbbb[ccc,
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dd],
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eee,
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ffff[gg,
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hhh,
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ii]]
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End
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assert_equal(expected, tree(0))
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assert_equal(expected, tree(19))
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end
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def test_tree_20_22
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expected = <<'End'.chomp
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aaaa[bbbbb[ccc, dd],
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eee,
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ffff[gg,
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hhh,
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ii]]
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End
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assert_equal(expected, tree(20))
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assert_equal(expected, tree(22))
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end
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def test_tree_23_43
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expected = <<'End'.chomp
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aaaa[bbbbb[ccc, dd],
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eee,
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ffff[gg, hhh, ii]]
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End
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assert_equal(expected, tree(23))
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assert_equal(expected, tree(43))
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end
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def test_tree_44
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assert_equal(<<'End'.chomp, tree(44))
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aaaa[bbbbb[ccc, dd], eee, ffff[gg, hhh, ii]]
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End
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end
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def tree_alt(width)
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PrettyPrint.format('', width) {|q| @tree.altshow(q)}
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end
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def test_tree_alt_00_18
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expected = <<'End'.chomp
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aaaa[
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bbbbb[
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ccc,
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dd
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],
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eee,
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ffff[
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gg,
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hhh,
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ii
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]
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]
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End
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assert_equal(expected, tree_alt(0))
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assert_equal(expected, tree_alt(18))
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end
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def test_tree_alt_19_20
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expected = <<'End'.chomp
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aaaa[
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bbbbb[ ccc, dd ],
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eee,
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ffff[
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gg,
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hhh,
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ii
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]
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]
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End
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assert_equal(expected, tree_alt(19))
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assert_equal(expected, tree_alt(20))
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end
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def test_tree_alt_20_49
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expected = <<'End'.chomp
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aaaa[
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bbbbb[ ccc, dd ],
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eee,
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ffff[ gg, hhh, ii ]
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]
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End
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assert_equal(expected, tree_alt(21))
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assert_equal(expected, tree_alt(49))
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end
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def test_tree_alt_50
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expected = <<'End'.chomp
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aaaa[ bbbbb[ ccc, dd ], eee, ffff[ gg, hhh, ii ] ]
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End
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assert_equal(expected, tree_alt(50))
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end
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class Tree
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def initialize(string, *children)
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@string = string
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@children = children
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end
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def show(q)
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q.group {
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q.text @string
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q.nest(@string.length) {
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unless @children.empty?
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q.text '['
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q.nest(1) {
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first = true
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@children.each {|t|
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if first
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first = false
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else
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q.text ','
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q.breakable
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end
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t.show(q)
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}
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}
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q.text ']'
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end
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}
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}
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end
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def altshow(q)
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q.group {
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q.text @string
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unless @children.empty?
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q.text '['
|
|
q.nest(2) {
|
|
q.breakable
|
|
first = true
|
|
@children.each {|t|
|
|
if first
|
|
first = false
|
|
else
|
|
q.text ','
|
|
q.breakable
|
|
end
|
|
t.altshow(q)
|
|
}
|
|
}
|
|
q.breakable
|
|
q.text ']'
|
|
end
|
|
}
|
|
end
|
|
|
|
end
|
|
end
|
|
|
|
class StrictPrettyExample < Test::Unit::TestCase
|
|
def prog(width)
|
|
PrettyPrint.format('', width) {|q|
|
|
q.group {
|
|
q.group {q.nest(2) {
|
|
q.text "if"; q.breakable;
|
|
q.group {
|
|
q.nest(2) {
|
|
q.group {q.text "a"; q.breakable; q.text "=="}
|
|
q.breakable; q.text "b"}}}}
|
|
q.breakable
|
|
q.group {q.nest(2) {
|
|
q.text "then"; q.breakable;
|
|
q.group {
|
|
q.nest(2) {
|
|
q.group {q.text "a"; q.breakable; q.text "<<"}
|
|
q.breakable; q.text "2"}}}}
|
|
q.breakable
|
|
q.group {q.nest(2) {
|
|
q.text "else"; q.breakable;
|
|
q.group {
|
|
q.nest(2) {
|
|
q.group {q.text "a"; q.breakable; q.text "+"}
|
|
q.breakable; q.text "b"}}}}}
|
|
}
|
|
end
|
|
|
|
def test_00_04
|
|
expected = <<'End'.chomp
|
|
if
|
|
a
|
|
==
|
|
b
|
|
then
|
|
a
|
|
<<
|
|
2
|
|
else
|
|
a
|
|
+
|
|
b
|
|
End
|
|
assert_equal(expected, prog(0))
|
|
assert_equal(expected, prog(4))
|
|
end
|
|
|
|
def test_05
|
|
expected = <<'End'.chomp
|
|
if
|
|
a
|
|
==
|
|
b
|
|
then
|
|
a
|
|
<<
|
|
2
|
|
else
|
|
a +
|
|
b
|
|
End
|
|
assert_equal(expected, prog(5))
|
|
end
|
|
|
|
def test_06
|
|
expected = <<'End'.chomp
|
|
if
|
|
a ==
|
|
b
|
|
then
|
|
a <<
|
|
2
|
|
else
|
|
a +
|
|
b
|
|
End
|
|
assert_equal(expected, prog(6))
|
|
end
|
|
|
|
def test_07
|
|
expected = <<'End'.chomp
|
|
if
|
|
a ==
|
|
b
|
|
then
|
|
a <<
|
|
2
|
|
else
|
|
a + b
|
|
End
|
|
assert_equal(expected, prog(7))
|
|
end
|
|
|
|
def test_08
|
|
expected = <<'End'.chomp
|
|
if
|
|
a == b
|
|
then
|
|
a << 2
|
|
else
|
|
a + b
|
|
End
|
|
assert_equal(expected, prog(8))
|
|
end
|
|
|
|
def test_09
|
|
expected = <<'End'.chomp
|
|
if a == b
|
|
then
|
|
a << 2
|
|
else
|
|
a + b
|
|
End
|
|
assert_equal(expected, prog(9))
|
|
end
|
|
|
|
def test_10
|
|
expected = <<'End'.chomp
|
|
if a == b
|
|
then
|
|
a << 2
|
|
else a + b
|
|
End
|
|
assert_equal(expected, prog(10))
|
|
end
|
|
|
|
def test_11_31
|
|
expected = <<'End'.chomp
|
|
if a == b
|
|
then a << 2
|
|
else a + b
|
|
End
|
|
assert_equal(expected, prog(11))
|
|
assert_equal(expected, prog(15))
|
|
assert_equal(expected, prog(31))
|
|
end
|
|
|
|
def test_32
|
|
expected = <<'End'.chomp
|
|
if a == b then a << 2 else a + b
|
|
End
|
|
assert_equal(expected, prog(32))
|
|
end
|
|
|
|
end
|
|
|
|
class TailGroup < Test::Unit::TestCase
|
|
def test_1
|
|
out = PrettyPrint.format('', 10) {|q|
|
|
q.group {
|
|
q.group {
|
|
q.text "abc"
|
|
q.breakable
|
|
q.text "def"
|
|
}
|
|
q.group {
|
|
q.text "ghi"
|
|
q.breakable
|
|
q.text "jkl"
|
|
}
|
|
}
|
|
}
|
|
assert_equal("abc defghi\njkl", out)
|
|
end
|
|
end
|
|
|
|
class NonString < Test::Unit::TestCase
|
|
def format(width)
|
|
PrettyPrint.format([], width, 'newline', lambda {|n| "#{n} spaces"}) {|q|
|
|
q.text(3, 3)
|
|
q.breakable(1, 1)
|
|
q.text(3, 3)
|
|
}
|
|
end
|
|
|
|
def test_6
|
|
assert_equal([3, "newline", "0 spaces", 3], format(6))
|
|
end
|
|
|
|
def test_7
|
|
assert_equal([3, 1, 3], format(7))
|
|
end
|
|
|
|
end
|
|
|
|
class Fill < Test::Unit::TestCase
|
|
def format(width)
|
|
PrettyPrint.format('', width) {|q|
|
|
q.group {
|
|
q.text 'abc'
|
|
q.fill_breakable
|
|
q.text 'def'
|
|
q.fill_breakable
|
|
q.text 'ghi'
|
|
q.fill_breakable
|
|
q.text 'jkl'
|
|
q.fill_breakable
|
|
q.text 'mno'
|
|
q.fill_breakable
|
|
q.text 'pqr'
|
|
q.fill_breakable
|
|
q.text 'stu'
|
|
}
|
|
}
|
|
end
|
|
|
|
def test_00_06
|
|
expected = <<'End'.chomp
|
|
abc
|
|
def
|
|
ghi
|
|
jkl
|
|
mno
|
|
pqr
|
|
stu
|
|
End
|
|
assert_equal(expected, format(0))
|
|
assert_equal(expected, format(6))
|
|
end
|
|
|
|
def test_07_10
|
|
expected = <<'End'.chomp
|
|
abc def
|
|
ghi jkl
|
|
mno pqr
|
|
stu
|
|
End
|
|
assert_equal(expected, format(7))
|
|
assert_equal(expected, format(10))
|
|
end
|
|
|
|
def test_11_14
|
|
expected = <<'End'.chomp
|
|
abc def ghi
|
|
jkl mno pqr
|
|
stu
|
|
End
|
|
assert_equal(expected, format(11))
|
|
assert_equal(expected, format(14))
|
|
end
|
|
|
|
def test_15_18
|
|
expected = <<'End'.chomp
|
|
abc def ghi jkl
|
|
mno pqr stu
|
|
End
|
|
assert_equal(expected, format(15))
|
|
assert_equal(expected, format(18))
|
|
end
|
|
|
|
def test_19_22
|
|
expected = <<'End'.chomp
|
|
abc def ghi jkl mno
|
|
pqr stu
|
|
End
|
|
assert_equal(expected, format(19))
|
|
assert_equal(expected, format(22))
|
|
end
|
|
|
|
def test_23_26
|
|
expected = <<'End'.chomp
|
|
abc def ghi jkl mno pqr
|
|
stu
|
|
End
|
|
assert_equal(expected, format(23))
|
|
assert_equal(expected, format(26))
|
|
end
|
|
|
|
def test_27
|
|
expected = <<'End'.chomp
|
|
abc def ghi jkl mno pqr stu
|
|
End
|
|
assert_equal(expected, format(27))
|
|
end
|
|
|
|
end
|
|
end
|