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# frozen_string_literal: true
module SyntaxSuggest
# Capture parse errors from Ripper
#
# Prism returns the errors with their messages, but Ripper
# does not. To get them we must make a custom subclass.
#
# Example:
#
# puts RipperErrors.new(" def foo").call.errors
# # => ["syntax error, unexpected end-of-input, expecting ';' or '\\n'"]
class RipperErrors < Ripper
attr_reader :errors
# Comes from ripper, called
# on every parse error, msg
# is a string
def on_parse_error(msg)
@errors ||= []
@errors << msg
end
alias_method :on_alias_error, :on_parse_error
alias_method :on_assign_error, :on_parse_error
alias_method :on_class_name_error, :on_parse_error
alias_method :on_param_error, :on_parse_error
alias_method :compile_error, :on_parse_error
def call
@run_once ||= begin
@errors = []
parse
true
end
self
end
end
end
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