Class: Assistant::LatexFragmentFormatter

Inherits:
Object
  • Object
show all
Defined in:
app/services/assistant/latex_fragment_formatter.rb

Overview

Protects explicit LaTeX fragments while a Sunny response passes through
Markdown and restores safe hooks for the on-demand KaTeX controller.

Constant Summary collapse

INLINE_LATEX_PATTERN =

Dollar signs are common in Sunny responses, so only treat a single-dollar
span as math when it contains an unambiguous LaTeX marker. This renders
$\rightarrow$, $x^2$, and \frac{...} formulas without consuming
currency text such as "$31.79 spend ... $2,187.80 revenue".

/
  \$(?!\$)
  (?<source>
    (?=[^$\n]*(?:\\[A-Za-z]+|[_^{}=]))
    [^$\n]+?
  )
  \$(?!\$)
/x
INLINE_CODE_PATTERN = 
/(`+)(.*?)\1/m

Instance Method Summary collapse

Constructor Details

#initialize(content) ⇒ LatexFragmentFormatter

Returns a new instance of LatexFragmentFormatter.



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# File 'app/services/assistant/latex_fragment_formatter.rb', line 22

def initialize(content)
  @content = content
  @fragments = []
  @placeholder_key = SecureRandom.hex(8).upcase
end

Instance Method Details

#extract ⇒ Object

Replace supported delimiters with opaque tokens. Fenced code has already
been extracted by ResponseFormatter; inline code is skipped here.



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# File 'app/services/assistant/latex_fragment_formatter.rb', line 30

def extract
  transform_outside_inline_code(@content) { |text| extract_from_text(text) }
end

#restore(html) ⇒ Object

Restore escaped, readable fallback markup after all Markdown, sanitation,
table, and entity-linking work is complete.



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# File 'app/services/assistant/latex_fragment_formatter.rb', line 36

def restore(html)
  @fragments.each_with_index do |fragment, index|
    html = html.gsub(placeholder(index)) { render_fragment(fragment) }
  end
  html
end