Module: Jade::Formatter::IfThenElse

Extended by:
Helper, IfThenElse
Included in:
IfThenElse
Defined in:
lib/jade/formatter/if_then_else.rb

Instance Method Summary collapse

Methods included from Helper

and_indent, dispatch_for, format_delimited, format_exposing, format_leading_comments, format_node, format_pattern, format_trailing_comment, format_type, format_type_atom, too_long?

Instance Method Details

#block_form?(if_branch, else_branch) ⇒ Boolean

Block form needed whenever a branch has more than one expression or a leading comment that the ternary form would drop.

Returns:

  • (Boolean) 


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# File 'lib/jade/formatter/if_then_else.rb', line 44

def block_form?(if_branch, else_branch)
  multi?(if_branch) || multi?(else_branch)
end

#format(node, indent:, source:) ⇒ Object 



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# File 'lib/jade/formatter/if_then_else.rb', line 7

def format(node, indent:, source:)
  node => AST::IfThenElse(condition:, if_branch:, else_branch:)

  cond_str = format_node(condition, source:)
  try_inline_ternary(cond_str, if_branch, else_branch, indent, source:) ||
    format_block(cond_str, if_branch, else_branch, indent, source:)
end

#format_block(cond_str, if_branch, else_branch, indent, source:) ⇒ Object 



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# File 'lib/jade/formatter/if_then_else.rb', line 32

def format_block(cond_str, if_branch, else_branch, indent, source:)
  [
    "if #{cond_str} then".then(&and_indent(indent)),
    format_node(if_branch, indent: indent + 1, source:),
    "else".then(&and_indent(indent)),
    format_node(else_branch, indent: indent + 1, source:),
    "end".then(&and_indent(indent)),
  ].join("\n")
end

#multi?(body) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/jade/formatter/if_then_else.rb', line 48

def multi?(body)
  body.expressions.length > 1 ||
    !body.leading_comments.empty? ||
    !body.expressions.first.leading_comments.empty?
end

#single_branch_expr(body, source:) ⇒ Object

Format a body known to hold a single expression with no leading comments. Called only after ‘block_form?` is false — the raise is an invariant guard, not a user-facing error.



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# File 'lib/jade/formatter/if_then_else.rb', line 57

def single_branch_expr(body, source:)
  raise "formatter invariant: single-expr body expected" if multi?(body)

  format_node(body.expressions.first, source:)
end

#try_inline_ternary(cond_str, if_branch, else_branch, indent, source:) ⇒ Object

Returns nil when block form is needed: either branch is multi- statement / has a leading comment, the combined line is too long, or either single-expression branch already formats across multiple lines (e.g. a ‘|>` ladder).



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# File 'lib/jade/formatter/if_then_else.rb', line 19

def try_inline_ternary(cond_str, if_branch, else_branch, indent, source:)
  return nil if block_form?(if_branch, else_branch)

  if_str   = single_branch_expr(if_branch, source:)
  else_str = single_branch_expr(else_branch, source:)
  inline   = "#{cond_str} ? #{if_str} : #{else_str}"

  return nil if if_str.include?("\n") || else_str.include?("\n")
  return nil if too_long?(inline, indent)

  inline.then(&and_indent(indent))
end