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242 lines
8.6 KiB
Ruby
242 lines
8.6 KiB
Ruby
# taken from irb
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# Implements tab completion for Readline in Pry
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class Pry::InputCompleter
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NUMERIC_REGEXP = /^(-?(0[dbo])?[0-9_]+(\.[0-9_]+)?([eE]-?[0-9]+)?)\.([^.]*)$/
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ARRAY_REGEXP = /^([^\]]*\])\.([^.]*)$/
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SYMBOL_REGEXP = /^(:[^:.]*)$/
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SYMBOL_METHOD_CALL_REGEXP = /^(:[^:.]+)\.([^.]*)$/
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REGEX_REGEXP = /^(\/[^\/]*\/)\.([^.]*)$/
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PROC_OR_HASH_REGEXP = /^([^\}]*\})\.([^.]*)$/
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TOPLEVEL_LOOKUP_REGEXP = /^::([A-Z][^:\.\(]*)$/
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CONSTANT_REGEXP = /^([A-Z][A-Za-z0-9]*)$/
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CONSTANT_OR_METHOD_REGEXP = /^([A-Z].*)::([^:.]*)$/
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HEX_REGEXP = /^(-?0x[0-9a-fA-F_]+)\.([^.]*)$/
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GLOBALVARIABLE_REGEXP = /^(\$[^.]*)$/
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VARIABLE_REGEXP = /^([^."].*)\.([^.]*)$/
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ReservedWords = [
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"BEGIN", "END",
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"alias", "and",
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"begin", "break",
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"case", "class",
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"def", "defined", "do",
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"else", "elsif", "end", "ensure",
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"false", "for",
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"if", "in",
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"module",
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"next", "nil", "not",
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"or",
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"redo", "rescue", "retry", "return",
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"self", "super",
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"then", "true",
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"undef", "unless", "until",
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"when", "while",
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"yield" ]
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Operators = [
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"%", "&", "*", "**", "+", "-", "/",
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"<", "<<", "<=", "<=>", "==", "===", "=~", ">", ">=", ">>",
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"[]", "[]=", "^", "!", "!=", "!~"
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]
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WORD_ESCAPE_STR = " \t\n\"\\'`><=;|&{("
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def initialize(input, pry = nil)
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@pry = pry
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@input = input
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@input.basic_word_break_characters = WORD_ESCAPE_STR if @input.respond_to?(:basic_word_break_characters=)
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@input.completion_append_character = nil if @input.respond_to?(:completion_append_character=)
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end
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#
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# Return a new completion proc for use by Readline.
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#
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def call(str, options = {})
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custom_completions = options[:custom_completions] || []
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# if there are multiple contexts e.g. cd 1/2/3
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# get new target for 1/2 and find candidates for 3
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path, input = build_path(str)
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if path.call.empty?
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target = options[:target]
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else
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# Assume the user is tab-completing the 'cd' command
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begin
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target = Pry::ObjectPath.new(path.call, @pry.binding_stack).resolve.last
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# but if that doesn't work, assume they're doing division with no spaces
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rescue Pry::CommandError
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target = options[:target]
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end
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end
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begin
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bind = target
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# Complete stdlib symbols
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case input
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when REGEX_REGEXP # Regexp
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receiver = $1
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message = Regexp.quote($2)
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candidates = Regexp.instance_methods.collect(&:to_s)
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select_message(path, receiver, message, candidates)
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when ARRAY_REGEXP # Array
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receiver = $1
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message = Regexp.quote($2)
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candidates = Array.instance_methods.collect(&:to_s)
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select_message(path, receiver, message, candidates)
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when PROC_OR_HASH_REGEXP # Proc or Hash
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receiver = $1
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message = Regexp.quote($2)
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candidates = Proc.instance_methods.collect(&:to_s)
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candidates |= Hash.instance_methods.collect(&:to_s)
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select_message(path, receiver, message, candidates)
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when SYMBOL_REGEXP # Symbol
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if Symbol.respond_to?(:all_symbols)
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sym = Regexp.quote($1)
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candidates = Symbol.all_symbols.collect{|s| ":" << s.id2name}
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candidates.grep(/^#{sym}/)
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else
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[]
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end
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when TOPLEVEL_LOOKUP_REGEXP # Absolute Constant or class methods
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receiver = $1
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candidates = Object.constants.collect(&:to_s)
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candidates.grep(/^#{receiver}/).collect{|e| "::" << e}
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when CONSTANT_REGEXP # Constant
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message = $1
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begin
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context = target.eval("self")
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context = context.class unless context.respond_to? :constants
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candidates = context.constants.collect(&:to_s)
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rescue
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candidates = []
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end
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candidates = candidates.grep(/^#{message}/).collect(&path)
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when CONSTANT_OR_METHOD_REGEXP # Constant or class methods
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receiver = $1
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message = Regexp.quote($2)
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begin
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candidates = eval("#{receiver}.constants.collect(&:to_s)", bind)
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candidates |= eval("#{receiver}.methods.collect(&:to_s)", bind)
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rescue Pry::RescuableException
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candidates = []
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end
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candidates.grep(/^#{message}/).collect{|e| receiver + "::" + e}
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when SYMBOL_METHOD_CALL_REGEXP # method call on a Symbol
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receiver = $1
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message = Regexp.quote($2)
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candidates = Symbol.instance_methods.collect(&:to_s)
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select_message(path, receiver, message, candidates)
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when NUMERIC_REGEXP
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# Numeric
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receiver = $1
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message = Regexp.quote($5)
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begin
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candidates = eval(receiver, bind).methods.collect(&:to_s)
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rescue Pry::RescuableException
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candidates = []
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end
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select_message(path, receiver, message, candidates)
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when HEX_REGEXP
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# Numeric(0xFFFF)
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receiver = $1
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message = Regexp.quote($2)
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begin
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candidates = eval(receiver, bind).methods.collect(&:to_s)
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rescue Pry::RescuableException
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candidates = []
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end
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select_message(path, receiver, message, candidates)
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when GLOBALVARIABLE_REGEXP # global
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regmessage = Regexp.new(Regexp.quote($1))
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candidates = global_variables.collect(&:to_s).grep(regmessage)
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when VARIABLE_REGEXP # variable
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receiver = $1
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message = Regexp.quote($2)
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gv = eval("global_variables", bind).collect(&:to_s)
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lv = eval("local_variables", bind).collect(&:to_s)
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cv = eval("self.class.constants", bind).collect(&:to_s)
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if (gv | lv | cv).include?(receiver) or /^[A-Z]/ =~ receiver && /\./ !~ receiver
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# foo.func and foo is local var. OR
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# Foo::Bar.func
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begin
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candidates = eval("#{receiver}.methods", bind).collect(&:to_s)
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rescue Pry::RescuableException
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candidates = []
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end
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else
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# func1.func2
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candidates = []
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ObjectSpace.each_object(Module){|m|
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begin
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name = m.name.to_s
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rescue Pry::RescuableException
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name = ""
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end
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next if name != "IRB::Context" and
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/^(IRB|SLex|RubyLex|RubyToken)/ =~ name
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# jruby doesn't always provide #instance_methods() on each
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# object.
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if m.respond_to?(:instance_methods)
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candidates.concat m.instance_methods(false).collect(&:to_s)
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end
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}
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candidates.sort!
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candidates.uniq!
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end
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select_message(path, receiver, message, candidates)
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when /^\.([^.]*)$/
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# Unknown(maybe String)
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receiver = ""
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message = Regexp.quote($1)
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candidates = String.instance_methods(true).collect(&:to_s)
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select_message(path, receiver, message, candidates)
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else
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candidates = eval(
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"methods | private_methods | local_variables | " \
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"self.class.constants | instance_variables",
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bind
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).collect(&:to_s)
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if eval("respond_to?(:class_variables)", bind)
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candidates += eval("class_variables", bind).collect(&:to_s)
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end
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candidates = (candidates|ReservedWords|custom_completions).grep(/^#{Regexp.quote(input)}/)
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candidates.collect(&path)
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end
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rescue Pry::RescuableException
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[]
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end
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end
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def select_message(path, receiver, message, candidates)
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candidates.grep(/^#{message}/).collect { |e|
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case e
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when /^[a-zA-Z_]/
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path.call(receiver + "." << e)
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when /^[0-9]/
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when *Operators
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#receiver + " " << e
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end
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}.compact
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end
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# build_path seperates the input into two parts: path and input.
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# input is the partial string that should be completed
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# path is a proc that takes an input and builds a full path.
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def build_path(input)
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# check to see if the input is a regex
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return proc {|i| i.to_s }, input if input[/\/\./]
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trailing_slash = input.end_with?('/')
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contexts = input.chomp('/').split(/\//)
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input = contexts[-1]
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path = proc do |i|
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p = contexts[0..-2].push(i).join('/')
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p += '/' if trailing_slash && !i.nil?
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p
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end
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return path, input
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end
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end
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