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Contents
require 'stringio'
require 'irb/ruby-lex'
module Debugger
class ExpressionInfoCommand < Command
def regexp
/^\s*ex(?:pression_info)?\s+/
end
def execute
string_to_parse = Command.unescape_incoming(@match.post_match) + " \n \n\n"
total_lines = string_to_parse.count("\n") + 1
lexer = RubyLex.new
lexer.set_input(create_io_reader(string_to_parse))
last_statement = ''
last_prompt = ''
last_indent = 0
lexer.set_prompt do |ltype, indent, continue, lineno|
next if (lineno >= total_lines)
last_prompt = ltype || ''
last_indent = indent
end
lexer.each_top_level_statement do |line, line_no|
last_statement = line
end
incomplete = true
if /\A\s*\Z/m =~ last_statement
incomplete = false
end
@printer.print_expression_info(incomplete, last_prompt, last_indent)
end
def create_io_reader(string_to_parse)
io = StringIO.new(string_to_parse)
if string_to_parse.respond_to?(:encoding)
io.instance_exec(string_to_parse.encoding) do |string_encoding|
@my_encoding = string_encoding
def self.encoding
@my_encoding
end
end
end
io
end
class << self
def help_command
"expression_info"
end
def help(cmd)
%{
ex[pression_info] <expression>\t
returns parser-related information for the expression given\t\t
'incomplete'=true|false\tindicates whether expression is a complete ruby
expression and can be evaluated without getting syntax errors
}
end
end
end
end
Version data entries
35 entries across 27 versions & 5 rubygems