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resolves asciidoctor#247 add support for the Rouge source highlighter
- add integration with Rouge for highlighting source listings - use no-break space for indent guard instead of zero-width space - guard indentation within Rouge formatter - organize the code to setup source highlighting - enable line number support when highlighting with Rouge - add pastie theme for Rouge - patch Rouge style lookup (see rouge-ruby/rouge#280) - cast lookup collections to set - optimize code
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,4 @@ | ||
| require 'rouge' | ||
| require_relative 'rouge_ext/formatters/prawn' | ||
| require_relative 'rouge_ext/css_theme' | ||
| require_relative 'rouge_ext/themes/pastie' |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,14 @@ | ||
| module Rouge | ||
| class CSSTheme | ||
| # Patch style_for to return most specific style first | ||
| # See https://github.com/jneen/rouge/issues/280 (fix pending) | ||
| def style_for token | ||
| token.token_chain.reverse_each do |t| | ||
| if (s = styles[t]) | ||
| return s | ||
| end | ||
| end | ||
| nil | ||
| end | ||
| end | ||
| end |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,121 @@ | ||
| module Rouge | ||
| module Formatters | ||
| # Transforms a token stream into an array of | ||
| # formatted text fragments for use with Prawn. | ||
| class Prawn < Formatter | ||
| tag 'prawn' | ||
|
|
||
| EOL = %(\n) | ||
| NoBreakSpace = %(\u00a0) | ||
| InnerIndent = %(\n ) | ||
| GuardedIndent = %(\u00a0) | ||
| GuardedInnerIndent = %(\n\u00a0) | ||
| BoldStyle = [:bold].to_set | ||
| ItalicStyle = [:italic].to_set | ||
| BoldItalicStyle = [:bold, :italic].to_set | ||
|
|
||
| def initialize opts = {} | ||
| unless ::Rouge::Theme === (theme = opts[:theme]) | ||
| unless theme && (theme = ::Rouge::Theme.find theme) | ||
| theme = ::Rouge::Themes::Pastie | ||
| end | ||
| theme = theme.new | ||
| end | ||
| @theme = theme | ||
| @normalized_colors = {} | ||
| @linenum_fragment_base = (create_fragment Token['Generic.Lineno']).merge linenum: true | ||
| end | ||
|
|
||
| # Override format method so fragments don't get flatted to a string | ||
| # and to add an options Hash. | ||
| def format tokens, opts = {} | ||
| stream tokens, opts | ||
| end | ||
|
|
||
| def stream tokens, opts = {} | ||
| if opts[:line_numbers] | ||
| # TODO implement line number start (offset) | ||
| linenum = 0 | ||
| fragments = [] | ||
| fragments << (create_linenum_fragment linenum += 1) | ||
| tokens.each do |tok, val| | ||
| fragment = create_fragment tok, val | ||
| if val == EOL | ||
| fragments << fragment | ||
| fragments << (create_linenum_fragment linenum += 1) | ||
| elsif val.include? EOL | ||
| val.each_line do |line| | ||
| fragments << (fragment.merge text: line) | ||
| # NOTE append linenum fragment if there's a next line; only works if source doesn't have trailing endline | ||
| if line.end_with? EOL | ||
| fragments << (create_linenum_fragment linenum += 1) | ||
| end | ||
| end | ||
| else | ||
| fragments << fragment | ||
| end | ||
| end | ||
| # NOTE drop orphaned linenum fragment (due to trailing endline in source) | ||
| fragments.pop if (last_fragment = fragments[-1]) && last_fragment[:linenum] | ||
| # NOTE pad numbers with less digits than the highest line number | ||
| if (linenum_w = (linenum / 10) + 1) > 1 | ||
| # NOTE extra column is the trailing space after the line number | ||
| linenum_w += 1 | ||
| fragments.each do |fragment| | ||
| fragment[:text] = %(#{fragment[:text].rjust linenum_w, NoBreakSpace}) if fragment[:linenum] | ||
| end | ||
| end | ||
| fragments | ||
| else | ||
| start_of_line = true | ||
| tokens.map do |tok, val| | ||
| # match one or more consecutive endlines | ||
| if val == EOL || (val == (EOL * val.length)) | ||
| start_of_line = true | ||
| { text: val } | ||
| else | ||
| val[0] = GuardedIndent if start_of_line && (val.start_with? ' ') | ||
| val.gsub! InnerIndent, GuardedInnerIndent if val.include? InnerIndent | ||
| start_of_line = val.end_with? EOL | ||
| # NOTE this optimization assumes we don't support/use background colors | ||
| val.rstrip.empty? ? { text: val } : (create_fragment tok, val) | ||
| end | ||
| end | ||
| # QUESTION should we strip trailing newline? | ||
| end | ||
| end | ||
|
|
||
| # TODO method could still be optimized (for instance, check if val is EOL) | ||
| def create_fragment tok, val = nil | ||
| fragment = val ? { text: val } : {} | ||
| if (style_rules = @theme.style_for tok) | ||
| # TODO support background color | ||
| if (fg = normalize_color style_rules.fg) | ||
| fragment[:color] = fg | ||
| end | ||
| if style_rules[:bold] | ||
| fragment[:styles] = style_rules[:italic] ? BoldItalicStyle : BoldStyle | ||
| elsif style_rules[:italic] | ||
| fragment[:styles] = ItalicStyle | ||
| end | ||
| end | ||
| fragment | ||
| end | ||
|
|
||
| def create_linenum_fragment linenum | ||
| @linenum_fragment_base.merge text: %(#{linenum} ) | ||
| end | ||
|
|
||
| def normalize_color raw | ||
| return unless raw | ||
| if (normalized = @normalized_colors[raw]) | ||
| normalized | ||
| else | ||
| normalized = (raw.start_with? '#') ? raw[1..-1] : raw | ||
| normalized = normalized.each_char.map {|c| c * 2 }.join if normalized.size == 3 | ||
| @normalized_colors[raw] = normalized | ||
| end | ||
| end | ||
| end | ||
| end | ||
| end |
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