Class: Racc::State
Overview
A LALR state.
Instance Attribute Summary collapse
-
#action ⇒ Object
readonly
Returns the value of attribute action.
-
#closure ⇒ Object
readonly
Returns the value of attribute closure.
-
#core ⇒ Object
readonly
Returns the value of attribute core.
-
#defact ⇒ Object
default action.
-
#goto_table ⇒ Object
readonly
Returns the value of attribute goto_table.
-
#gotos ⇒ Object
readonly
Returns the value of attribute gotos.
-
#ident ⇒ Object
(also: #stateid, #hash)
readonly
Returns the value of attribute ident.
-
#ritems ⇒ Object
readonly
Returns the value of attribute ritems.
-
#rrconf ⇒ Object
readonly
Returns the value of attribute rrconf.
-
#rrules ⇒ Object
readonly
Returns the value of attribute rrules.
-
#srconf ⇒ Object
readonly
Returns the value of attribute srconf.
-
#stokens ⇒ Object
readonly
Returns the value of attribute stokens.
Instance Method Summary collapse
- #==(oth) ⇒ Object (also: #eql?)
- #check_la(la_rules) ⇒ Object
- #conflict? ⇒ Boolean
-
#initialize(ident, core) ⇒ State
constructor
A new instance of State.
- #inspect ⇒ Object (also: #to_s)
- #la=(la) ⇒ Object
- #make_closure(core) ⇒ Object
- #n_rrconflicts ⇒ Object
- #n_srconflicts ⇒ Object
- #rr_conflict(high, low, ctok) ⇒ Object
- #rruleid(rule) ⇒ Object
- #sr_conflict(shift, reduce) ⇒ Object
Constructor Details
#initialize(ident, core) ⇒ State
Returns a new instance of State.
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# File 'lib/racc/state.rb', line 609 def initialize(ident, core) @ident = ident @core = core @goto_table = {} @gotos = {} @stokens = nil @ritems = nil @action = {} @defact = nil @rrconf = nil @srconf = nil @closure = make_closure(@core) end |
Instance Attribute Details
#action ⇒ Object (readonly)
Returns the value of attribute action.
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# File 'lib/racc/state.rb', line 638 def action @action end |
#closure ⇒ Object (readonly)
Returns the value of attribute closure.
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# File 'lib/racc/state.rb', line 629 def closure @closure end |
#core ⇒ Object (readonly)
Returns the value of attribute core.
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# File 'lib/racc/state.rb', line 628 def core @core end |
#defact ⇒ Object
default action
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# File 'lib/racc/state.rb', line 639 def defact @defact end |
#goto_table ⇒ Object (readonly)
Returns the value of attribute goto_table.
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# File 'lib/racc/state.rb', line 631 def goto_table @goto_table end |
#gotos ⇒ Object (readonly)
Returns the value of attribute gotos.
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# File 'lib/racc/state.rb', line 632 def gotos @gotos end |
#ident ⇒ Object (readonly) Also known as: stateid, hash
Returns the value of attribute ident.
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# File 'lib/racc/state.rb', line 624 def ident @ident end |
#ritems ⇒ Object (readonly)
Returns the value of attribute ritems.
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# File 'lib/racc/state.rb', line 635 def ritems @ritems end |
#rrconf ⇒ Object (readonly)
Returns the value of attribute rrconf.
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# File 'lib/racc/state.rb', line 641 def rrconf @rrconf end |
#rrules ⇒ Object (readonly)
Returns the value of attribute rrules.
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# File 'lib/racc/state.rb', line 636 def rrules @rrules end |
#srconf ⇒ Object (readonly)
Returns the value of attribute srconf.
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# File 'lib/racc/state.rb', line 642 def srconf @srconf end |
#stokens ⇒ Object (readonly)
Returns the value of attribute stokens.
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# File 'lib/racc/state.rb', line 634 def stokens @stokens end |
Instance Method Details
#==(oth) ⇒ Object Also known as: eql?
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# File 'lib/racc/state.rb', line 650 def ==(oth) @ident == oth.ident end |
#check_la(la_rules) ⇒ Object
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# File 'lib/racc/state.rb', line 667 def check_la(la_rules) @conflict = false s = [] r = [] @closure.each do |ptr| if t = ptr.dereference if t.terminal? s[t.ident] = t if t.ident == 1 # $error @conflict = true end end else r.push ptr.rule end end unless r.empty? if not s.empty? or r.size > 1 @conflict = true end end s.compact! @stokens = s @rrules = r if @conflict @la_rules_i = la_rules.size @la_rules = r.map {|i| i.ident } la_rules.concat r else @la_rules_i = @la_rules = nil end end |
#conflict? ⇒ Boolean
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# File 'lib/racc/state.rb', line 701 def conflict? @conflict end |
#inspect ⇒ Object Also known as: to_s
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# File 'lib/racc/state.rb', line 644 def inspect "<state #{@ident}>" end |
#la=(la) ⇒ Object
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# File 'lib/racc/state.rb', line 718 def la=(la) return unless @conflict i = @la_rules_i @ritems = r = [] @rrules.each do |rule| r.push Item.new(rule, la[i]) i += 1 end end |
#make_closure(core) ⇒ Object
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# File 'lib/racc/state.rb', line 656 def make_closure(core) set = ISet.new core.each do |ptr| set.add ptr if t = ptr.dereference and t.nonterminal? set.update_a t. end end set.to_a end |
#n_rrconflicts ⇒ Object
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# File 'lib/racc/state.rb', line 754 def n_rrconflicts @rrconf ? @rrconf.size : 0 end |
#n_srconflicts ⇒ Object
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# File 'lib/racc/state.rb', line 750 def n_srconflicts @srconf ? @srconf.size : 0 end |
#rr_conflict(high, low, ctok) ⇒ Object
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# File 'lib/racc/state.rb', line 728 def rr_conflict(high, low, ctok) c = RRconflict.new(@ident, high, low, ctok) @rrconf ||= {} if a = @rrconf[ctok] a.push c else @rrconf[ctok] = [c] end end |
#rruleid(rule) ⇒ Object
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# File 'lib/racc/state.rb', line 705 def rruleid(rule) if i = @la_rules.index(rule.ident) @la_rules_i + i else puts '/// rruleid' p self p rule p @rrules p @la_rules_i raise 'racc: fatal: cannot get reduce rule id' end end |
#sr_conflict(shift, reduce) ⇒ Object
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# File 'lib/racc/state.rb', line 739 def sr_conflict(shift, reduce) c = SRconflict.new(@ident, shift, reduce) @srconf ||= {} if a = @srconf[shift] a.push c else @srconf[shift] = [c] end end |