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94 lines
2.1 KiB
Ruby
94 lines
2.1 KiB
Ruby
require 'parslet'
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module Bristlecode
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def Bristlecode.to_html(text)
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parser = Bristlecode::Parser.new
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parse_tree = parser.parse(text)
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tree = Bristlecode::Transform.new.apply(parse_tree)
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tree.to_html
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end
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class Parser < Parslet::Parser
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rule(:space) { match('\s').repeat(1) }
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rule(:space?) { space.maybe }
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rule(:bold_open) { str('[b]') | str('[B]') }
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rule(:bold_close) { str('[/b]') | str('[/B]') | eof }
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rule(:bold) { bold_open >> children.as(:bold) >> bold_close }
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rule(:italic_open) { str('[i]') | str('[I]') }
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rule(:italic_close) { str('[/i]') | str('[/I]') | eof }
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rule(:italic) { italic_open >> children.as(:italic) >> italic_close }
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rule(:eof) { any.absent? }
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rule(:tag) { bold | italic }
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rule(:elem) { text | tag }
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rule(:tag_open) { bold_open | italic_open }
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rule(:tag_close) { bold_close | italic_close }
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rule(:tag_delim) { tag_open | tag_close }
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rule(:text) { (tag_delim.absent? >> any).repeat(1).as(:text) }
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rule(:children) { space? >> elem.repeat(1) }
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rule(:doc) { space? >> elem.repeat.as(:doc) }
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root(:doc)
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end
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class Transform < Parslet::Transform
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rule(bold: sequence(:children)) { Bold.new(children) }
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rule(italic: sequence(:children)) { Italic.new(children) }
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rule(text: simple(:text)) { Text.new(text) }
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rule(doc: subtree(:doc)) { Doc.new(doc) }
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end
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class Doc
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def initialize(children)
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@children = children
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end
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def to_html
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s = StringIO.new
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@children.each{|child| s << child.to_html }
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s.string
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end
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end
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class Text
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def initialize(text)
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@text = text
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end
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def to_html
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@text
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end
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end
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class Bold
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def initialize(children)
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@children = children
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end
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def to_html
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s = StringIO.new
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s << "<b>"
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@children.each{|child| s << child.to_html }
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s << "</b>"
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s.string
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end
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end
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class Italic
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def initialize(children)
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@children = children
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end
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def to_html
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s = StringIO.new
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s << "<i>"
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@children.each{|child| s << child.to_html }
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s << "</i>"
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s.string
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end
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end
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end
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