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## Filter-based Markdown translator.
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#
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module Markdown
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## Superclass that defines behaviour of all translators
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# @abstract Don't use directly - it only defins the ability to chain translators
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class AbstractTranslator
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attr_accessor :input
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attr_accessor :output
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def initialize()
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@chain = []
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end
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def +(nextTranslator)
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@chain.append nextTranslator
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return self
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end
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def to_html
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output = @output
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@chain.each { |x|
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x = x.new(output) if x.class == Class
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x.to_html
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output = x.output
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}
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return output
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end
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end
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module_function
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def html_highlighter; @html_highlighter end
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def html_highlighter= v; @html_highlighter = v end
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## Translator for linear tags in Markdown.
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# A linear tag is any tag that starts anywhere on the line, and closes on the same exact line.
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class LinearTagTranslator < AbstractTranslator
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def initialize(text)
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@input = text
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@output = text
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super()
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end
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def to_html
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@output = @input
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# Newline
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.sub(/\s{2}[\n\r]/,"<br/>")
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# Inline code (discord style)
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.gsub(/(?<!\\)``(.*?[^\\])``/) {
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code = Regexp.last_match[1]
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"<code>#{code.gsub /[*`~_!\[]/,"\\\\\\0"}</code>"
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}
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# Inline code (Markdown style)
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.gsub(/(?<!\\)`(.*?[^\\])`/) {
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code = Regexp.last_match[1]
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"<code>#{code.gsub /[*`~_!\[]/,"\\\\\\0"}</code>"
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}
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# Bold-italics
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.gsub(/(?<!\\)\*\*\*(.*?[^\\])\*\*\*/,"<i><b>\\1</b></i>")
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# Bold
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.gsub(/(?<!\\)\*\*(.*?[^\\])\*\*/,"<b>\\1</b>")
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# Italics
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.gsub(/(?<!\\)\*(.*?[^\\])\*/,"<i>\\1</i>")
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# Strikethrough
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.gsub(/(?<!\\)~~(.*?[^\\])~~/,"<s>\\1</s>")
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# Underline
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.gsub(/(?<!\\)__(.*?[^\\])__/,"<span style=\"text-decoration: underline\">\\1</span>")
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# Image
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.gsub(/(?<!\\)!\[(.*)\]\((.*)\)/,"<img src=\"\\2\" alt=\"\\1\" />")
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# Link
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.gsub(/(?<!\\)\[(.*)\]\((.*)\)/,"<a href=\"\\2\">\\1</a>")
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super
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end
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end
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## Translator for linear leftmost tags.
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# Leftmost linear tags open on the leftmost end of the string, and close once the line ends. These tags do not need to be explicitly closed.
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class LeftmostTagTranslator < AbstractTranslator
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def initialize(text)
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@input = text
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@output = text
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super()
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end
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def to_html
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# Headers
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@output = @input.split("\n").map do |x|
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x.gsub(/^(?<!\\)(\#{1,4})([^\n\r]*)/) {
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level,content = Regexp.last_match[1..2]
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"<h#{level.length}>"+content+"</h#{level.length}>"
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}.gsub(/^\-{3,}/,"<hr>")
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end.join("\n")
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super
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end
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end
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## Translator for code blocks in markdown
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# Code blocks can have syntax highlighting. This class implements an attribute for providing a syntax highlighter, one handler per requested output.
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class CodeBlockTranslator < AbstractTranslator
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def initialize(text)
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@input = text
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@output = text
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super()
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end
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def to_html
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@output = @input.gsub(/(?:\n|^)```([\w_-]*)([\s\S]+?)```/) {
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language,code = Regexp.last_match[1..2]
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code = Markdown::html_highlighter.call(language,code) if Markdown::html_highlighter
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"<pre><code>#{code.gsub /[|#*`~_!\[]/,"\\\\\\0"}</code></pre>"
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}
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super()
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end
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end
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## Translator for quotes in Markdown.
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# These deserve their own place in hell. As if the "yaml with triangle brackets instead of spaces" syntax wasn't horrible enough, each quote is its own markdown context.
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class QuoteTranslator < AbstractTranslator
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def initialize(text)
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if text.is_a? Array then
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@lines = text
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elsif text.is_a? String then
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@lines = text.split("\n")
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end
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@output = text
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super()
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end
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def input= (v)
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@lines = v.split("\n")
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@output = v
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end
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def input
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@lines.join("\n")
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end
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def to_html
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stack = []
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range = []
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@lines.each_with_index { |x,index|
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if x.match /^\s*> ?/ then
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range[0] = index if not range[0]
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range[1] = index
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else
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stack.append(range[0]..range[1]) if range[0] and range[1]
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range = []
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end
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}
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stack.append(range[0]..range[1]) if range[0] and range[1]
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stack.reverse.each { |r|
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@lines[r.begin] = "<blockquote>\n"+@lines[r.begin]
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@lines[r.end] = @lines[r.end]+"\n</blockquote>"
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@lines[r] = @lines[r].map { |line|
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line.sub /^(\s*)> ?/,"\\1 "
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}
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@lines[r] = QuoteTranslator.new(@lines[r]).to_html
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}
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@output = @lines.join("\n")
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super
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end
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end
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## Table parser
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# translates tables from a format in markdown to an html table
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class TableTranslator < AbstractTranslator
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def initialize(text)
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@input = text
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@output = text
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super()
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end
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def to_html
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lines = @output.split("\n")
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table_testline = -1
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table_start = -1
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table_column_count = 0
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tables = []
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cur_table = []
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lines.each_with_index { |line,index|
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if (table_start != -1) and (line.match /^\s*\|([^\|]*\|){#{table_column_count-1}}$/) then
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if (table_testline == -1) then
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if (line.match /^\s*\|(\-*\|){#{table_column_count-1}}$/) then
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table_testline = 1
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else
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table_start = -1
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cur_table = []
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end
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else
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cur_table.push (line.split("|").filter_map { |x| x.strip if x.match /\S+/ })
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end
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elsif (table_start != -1) then
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obj = {table: cur_table, start: table_start, end: index}
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tables.push(obj)
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table_start = -1
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cur_table = []
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table_testline = -1
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table_column_count = 0
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end
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if (table_start == -1) and (line.start_with? /\s*\|/ ) and (line.match /^\s*\|.*\|/) then
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table_start = index
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table_column_count = line.count "|"
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cur_table.push (line.split("|").filter_map { |x| x.strip if x.match /\S+/ })
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end
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}
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if cur_table != [] then
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obj = {table: cur_table, start:table_start, end: lines.count-1}
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tables.push(obj)
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end
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tables.reverse.each { |x|
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lines[x[:start]..x[:end]] = (x[:table].map do |a2d|
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(a2d.map { |x| (x.start_with? "#") ? " <th>"+x.sub(/^#\s+/,"")+"</th>" : " <td>"+x+"</td>"}).prepend(" <tr>").append(" </tr>")
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end).flatten.prepend("<table>").append("</table>")
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}
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@output = lines.join("\n")
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super()
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end
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end
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# Backslash cleaner
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# Cleans excessive backslashes after the translation
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class BackslashTranslator < AbstractTranslator
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def initialize(text)
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@input = text
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@output = text
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end
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def to_html
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@output = @input.gsub(/\\(.)/,"\\1")
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end
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end
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end
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@ -0,0 +1,118 @@
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require_relative "markdown"
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puts Markdown::LinearTagTranslator.new(<<CODE
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*Italics*
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**Bold**
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***Bolitalics***
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__underline__
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__underline plus ***bolitalics***__
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___invalid underline___
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~~strikethrough ~~
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`code that ignores ***all*** __Markdown__ [tags](https://nevergonnagiveyouup)`
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me: google en passant
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them: [holy hell!](https://google.com/q?=en+passant)
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CODE
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).to_html
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puts Markdown::LeftmostTagTranslator.new(<<CODE
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# Header v1
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## Header v2
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### Header v3
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#### Header v4
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##### Invalid header
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#### Not a header
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*** Also #### Not a header ***
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CODE
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).to_html
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puts Markdown::QuoteTranslator.new(<<CODE
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> Quote begins
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>
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> yea
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> # header btw
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> > nextlevel quote
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> > more quote
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> > those are quotes
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> > yes
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> > > third level quote
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> > > yes
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> > second level again
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> > > third level again
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> > second level oioioi
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> >
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> > > third
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> > >
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> > >
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> > >
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>
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>
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>
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> fin
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CODE
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).to_html
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puts Markdown::CodeBlockTranslator.new(<<CODE
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```markdown
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shmarkshmark
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# pee pee
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# piss
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**ass**
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__cock__
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cock__
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piss__
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`shmark shmark`
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```
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CODE
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).to_html
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test = (Markdown::CodeBlockTranslator.new(<<TEXT
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# Markdown garbage gallery
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## Header level 2
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### Header level 3
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#### Header level 4
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__[Underlined Link](https://google.com)__
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__**unreal shitworks**__
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split
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---
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> Here's a bunch of shit i guess lmao idk
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```markdown
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test
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test
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test
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|1|2|3|
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|-|-|-|
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|a|b|c|
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| uneven rows | test | yes |
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|-|-|-|
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| sosiska | dinozavri | suda pihaem |
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| sosiska 2 | vitalya 2 | brat 2 |
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*** test ***
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piss
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cock
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__cock__
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# hi
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```
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> ok
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> here i go pissing
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> ***time to take a piss***
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> > pissing
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> > "what the hell are you doing"
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> > i'm taking a pieeees
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> > "why areyou not jomping at me thats what yourshupposed to do
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> > I might do it focking later
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> > ok
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> # bug
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> __cum__
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__mashup__
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| # sosiska | sosiska | suda pihaem |
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|-|-|-|
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| # 2 | chuvak ya ukral tvayu sardelku ))0)))0))))))) | __blya ((9((9((9)__ |
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| # azazaz lalka sasI | test | test |
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TEXT
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)+Markdown::QuoteTranslator+Markdown::LeftmostTagTranslator+Markdown::LinearTagTranslator+Markdown::TableTranslator+Markdown::BackslashTranslator)
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.to_html
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write = File.new("/tmp/test.html","w")
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write.write(test)
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write.close
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