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# frozen_string_literal: true
# :markup: markdown
require "ripper"
module Prism
# This is a class that wraps the Ripper lexer to produce almost exactly the
# same tokens.
class LexRipper # :nodoc:
attr_reader :source
def initialize(source)
@source = source
end
def result
previous = [] #: [[Integer, Integer], Symbol, String, untyped] | []
results = [] #: Array[[[Integer, Integer], Symbol, String, untyped]]
lex(source).each do |token|
case token[1]
when :on_sp
# skip
when :on_tstring_content
if previous[1] == :on_tstring_content && (token[2].start_with?("\#$") || token[2].start_with?("\#@"))
previous[2] << token[2]
else
results << token
previous = token
end
when :on_words_sep
if previous[1] == :on_words_sep
previous[2] << token[2]
else
results << token
previous = token
end
else
results << token
previous = token
end
end
results
end
private
if Ripper.method(:lex).parameters.assoc(:keyrest)
def lex(source)
Ripper.lex(source, raise_errors: true)
end
else
def lex(source)
ripper = Ripper::Lexer.new(source)
ripper.lex.tap do |result|
raise SyntaxError, ripper.errors.map(&:message).join(' ;') if ripper.errors.any?
end
end
end
end
private_constant :LexRipper
end
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