summaryrefslogtreecommitdiff
path: root/lib/irb/completion.rb
blob: 0db470db94de5fe63d20390f68dce6533682160a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
#
#   irb/completor.rb - 
#   	$Release Version: 0.9$
#   	$Revision$
#   	by Keiju ISHITSUKA(keiju@ishitsuka.com)
#       From Original Idea of shugo@ruby-lang.org
#

require "readline"

module IRB
  module InputCompletor

    @RCS_ID='-$Id$-'

    ReservedWords = [
      "BEGIN", "END",
      "alias", "and", 
      "begin", "break", 
      "case", "class",
      "def", "defined", "do",
      "else", "elsif", "end", "ensure",
      "false", "for", 
      "if", "in", 
      "module", 
      "next", "nil", "not",
      "or", 
      "redo", "rescue", "retry", "return",
      "self", "super",
      "then", "true",
      "undef", "unless", "until",
      "when", "while",
      "yield",
    ]
      
    CompletionProc = proc { |input|
      bind = IRB.conf[:MAIN_CONTEXT].workspace.binding
      
#      puts "input: #{input}"

      case input
      when /^(\/[^\/]*\/)\.([^.]*)$/
	# Regexp
	receiver = $1
	message = Regexp.quote($2)

	candidates = Regexp.instance_methods.collect{|m| m.to_s}
	select_message(receiver, message, candidates)

      when /^([^\]]*\])\.([^.]*)$/
	# Array
	receiver = $1
	message = Regexp.quote($2)

	candidates = Array.instance_methods.collect{|m| m.to_s}
	select_message(receiver, message, candidates)

      when /^([^\}]*\})\.([^.]*)$/
	# Proc or Hash
	receiver = $1
	message = Regexp.quote($2)

	candidates = Proc.instance_methods.collect{|m| m.to_s}
	candidates |= Hash.instance_methods.collect{|m| m.to_s}
	select_message(receiver, message, candidates)
	
      when /^(:[^:.]*)$/
 	# Symbol
	if Symbol.respond_to?(:all_symbols)
	  sym = $1
	  candidates = Symbol.all_symbols.collect{|s| ":" + s.id2name}
	  candidates.grep(/^#{sym}/)
	else
	  []
	end

      when /^::([A-Z][^:\.\(]*)$/
	# Absolute Constant or class methods
	receiver = $1
	candidates = Object.constants.collect{|m| m.to_s}
	candidates.grep(/^#{receiver}/).collect{|e| "::" + e}

      when /^(((::)?[A-Z][^:.\(]*)+)::?([^:.]*)$/
	# Constant or class methods
	receiver = $1
	message = Regexp.quote($4)
	begin
	  candidates = eval("#{receiver}.constants.collect{|m| m.to_s}", bind)
	  candidates |= eval("#{receiver}.methods.collect{|m| m.to_s}", bind)
	rescue Exception
	  candidates = []
	end
	candidates.grep(/^#{message}/).collect{|e| receiver + "::" + e}

      when /^(:[^:.]+)\.([^.]*)$/
	# Symbol
	receiver = $1
	message = Regexp.quote($2)

	candidates = Symbol.instance_methods.collect{|m| m.to_s}
	select_message(receiver, message, candidates)

      when /^(-?(0[dbo])?[0-9_]+(\.[0-9_]+)?([eE]-?[0-9]+)?)\.([^.]*)$/
	# Numeric
	receiver = $1
	message = Regexp.quote($5)

	begin
	  candidates = eval(receiver, bind).methods.collect{|m| m.to_s}
	rescue Exception
	  candidates = []
	end
	select_message(receiver, message, candidates)

      when /^(-?0x[0-9a-fA-F_]+)\.([^.]*)$/
	# Numeric(0xFFFF)
	receiver = $1
	message = Regexp.quote($2)

	begin
	  candidates = eval(receiver, bind).methods.collect{|m| m.to_s}
	rescue Exception
	  candidates = []
	end
	select_message(receiver, message, candidates)

      when /^(\$[^.]*)$/
	regmessage = Regexp.new(Regexp.quote($1))
	candidates = global_variables.collect{|m| m.to_s}.grep(regmessage)

#      when /^(\$?(\.?[^.]+)+)\.([^.]*)$/
      when /^((\.?[^.]+)+)\.([^.]*)$/
	# variable
	receiver = $1
	message = Regexp.quote($3)

	gv = eval("global_variables", bind).collect{|m| m.to_s}
	lv = eval("local_variables", bind).collect{|m| m.to_s}
	cv = eval("self.class.constants", bind).collect{|m| m.to_s}
	
	if (gv | lv | cv).include?(receiver)
	  # foo.func and foo is local var.
	  candidates = eval("#{receiver}.methods", bind).collect{|m| m.to_s}
	elsif /^[A-Z]/ =~ receiver and /\./ !~ receiver
	  # Foo::Bar.func
	  begin
	    candidates = eval("#{receiver}.methods", bind).collect{|m| m.to_s}
	  rescue Exception
	    candidates = []
	  end
	else
	  # func1.func2
	  candidates = []
	  ObjectSpace.each_object(Module){|m|
	    begin
	      name = m.name
	    rescue Exception
	      name = ""
	    end
	    next if name != "IRB::Context" and 
	      /^(IRB|SLex|RubyLex|RubyToken)/ =~ name
	    candidates.concat m.instance_methods(false).collect{|m| m.to_s}
	  }
	  candidates.sort!
	  candidates.uniq!
	end
	select_message(receiver, message, candidates)

      when /^\.([^.]*)$/
	# unknown(maybe String)

	receiver = ""
	message = Regexp.quote($1)

	candidates = String.instance_methods(true).collect{|m| m.to_s}
	select_message(receiver, message, candidates)

      else
	candidates = eval("methods | private_methods | local_variables | self.class.constants", bind).collect{|m| m.to_s}
			  
	(candidates|ReservedWords).grep(/^#{Regexp.quote(input)}/)
      end
    }

    Operators = ["%", "&", "*", "**", "+",  "-",  "/",
      "<", "<<", "<=", "<=>", "==", "===", "=~", ">", ">=", ">>",
      "[]", "[]=", "^",]

    def self.select_message(receiver, message, candidates)
      candidates.grep(/^#{message}/).collect do |e|
	case e
	when /^[a-zA-Z_]/
	  receiver + "." + e
	when /^[0-9]/
	when *Operators
	  #receiver + " " + e
	end
      end
    end
  end
end

if Readline.respond_to?("basic_word_break_characters=")
  Readline.basic_word_break_characters= " \t\n\"\\'`><=;|&{("
end
Readline.completion_append_character = nil
Readline.completion_proc = IRB::InputCompletor::CompletionProc