class method

Ripper.slice

(::String src, ::String pattern, ?::Integer n) -> ::String?

slice(src, pattern, n = 0)

ext/ripper/lib/ripper/lexer.rb View on GitHub ↗

# File tmp/rubies/ruby-4.0.0/ext/ripper/lib/ripper/lexer.rb, line 277
def Ripper.slice(src, pattern, n = 0)
  if m = token_match(src, pattern)
  then m.string(n)
  else nil
  end
end

EXPERIMENTAL

Parses src and return a string which was matched to pattern. pattern should be described as Regexp.

Example

require 'ripper'

p Ripper.slice('def m(a) nil end', 'ident')                   #=> "m"
p Ripper.slice('def m(a) nil end', '[ident lparen rparen]+')  #=> "m(a)"
p Ripper.slice("<<EOS\nstring\nEOS",
               'heredoc_beg nl $(tstring_content*) heredoc_end', 1)
    #=> "string\n"

See also .sexp_raw .tokenize .sexp #compile_error also in 4.1 · 3.4 · 3.3 · 3.2 · 3.1 · 3.0

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