You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
94 lines
2.1 KiB
Ruby
94 lines
2.1 KiB
Ruby
require 'parslet'
|
|
|
|
module Bristlecode
|
|
|
|
def Bristlecode.to_html(text)
|
|
parser = Bristlecode::Parser.new
|
|
parse_tree = parser.parse(text)
|
|
tree = Bristlecode::Transform.new.apply(parse_tree)
|
|
tree.to_html
|
|
end
|
|
|
|
class Parser < Parslet::Parser
|
|
rule(:space) { match('\s').repeat(1) }
|
|
rule(:space?) { space.maybe }
|
|
|
|
rule(:bold_open) { str('[b]') | str('[B]') }
|
|
rule(:bold_close) { str('[/b]') | str('[/B]') }
|
|
rule(:bold) { bold_open >> children.as(:bold) >> bold_close }
|
|
|
|
rule(:italic_open) { str('[i]') | str('[I]') }
|
|
rule(:italic_close) { str('[/i]') | str('[/I]') }
|
|
rule(:italic) { italic_open >> children.as(:italic) >> italic_close }
|
|
|
|
rule(:eof) { any.absent? }
|
|
rule(:tag) { bold | italic }
|
|
rule(:elem) { text | tag }
|
|
rule(:tag_open) { bold_open | italic_open }
|
|
rule(:tag_close) { bold_close | italic_close }
|
|
rule(:tag_delim) { tag_open | tag_close }
|
|
|
|
rule(:text) { (tag_delim.absent? >> any).repeat(1).as(:text) }
|
|
rule(:children) { space? >> elem.repeat(1) }
|
|
rule(:doc) { space? >> elem.repeat(1).as(:doc) }
|
|
root(:doc)
|
|
end
|
|
|
|
class Transform < Parslet::Transform
|
|
rule(bold: sequence(:children)) { Bold.new(children) }
|
|
rule(italic: sequence(:children)) { Italic.new(children) }
|
|
rule(text: simple(:text)) { Text.new(text) }
|
|
rule(doc: subtree(:doc)) { Doc.new(doc) }
|
|
end
|
|
|
|
class Doc
|
|
def initialize(children)
|
|
@children = children
|
|
end
|
|
|
|
def to_html
|
|
s = StringIO.new
|
|
@children.each{|child| s << child.to_html }
|
|
s.string
|
|
end
|
|
end
|
|
|
|
class Text
|
|
def initialize(text)
|
|
@text = text
|
|
end
|
|
|
|
def to_html
|
|
@text
|
|
end
|
|
end
|
|
|
|
class Bold
|
|
def initialize(children)
|
|
@children = children
|
|
end
|
|
|
|
def to_html
|
|
s = StringIO.new
|
|
s << "<b>"
|
|
@children.each{|child| s << child.to_html }
|
|
s << "</b>"
|
|
s.string
|
|
end
|
|
end
|
|
|
|
class Italic
|
|
def initialize(children)
|
|
@children = children
|
|
end
|
|
|
|
def to_html
|
|
s = StringIO.new
|
|
s << "<i>"
|
|
@children.each{|child| s << child.to_html }
|
|
s << "</i>"
|
|
s.string
|
|
end
|
|
end
|
|
end
|