class Antlr4::Runtime::ATNConfigSet

Attributes

configs[RW]
conflictingAlts[RW]
dips_into_outer_context[RW]
full_ctx[RW]
has_semantic_context[RW]
readonly[RW]
unique_alt[RW]

Public Class Methods

new(full_ctx = true) click to toggle source
# File lib/antlr4/runtime/atn_config_set.rb, line 12
def initialize(full_ctx = true)
  @full_ctx = full_ctx
  @has_semantic_context = false
  @readonly = false
  @config_lookup = ConfigHashSet.new
  @configs = []
  @dips_into_outer_context = false
  @unique_alt = ATN::INVALID_ALT_NUMBER
end

Public Instance Methods

add(config, merge_cache = nil) click to toggle source
# File lib/antlr4/runtime/atn_config_set.rb, line 33
def add(config, merge_cache = nil)
  raise IllegalStateException, 'This set is readonly' if @readonly

  if config.semantic_context != SemanticContext::NONE
    @has_semantic_context = true
  end

  @dips_into_outer_context = true if config.outer_context_depth > 0

  existing = @config_lookup.get_or_add config
  if existing == config
    @cached_hash_code = -1
    @configs << config
    return true
  end

  root_is_wildcard = !@full_ctx

  merged = PredictionContextUtils.merge(existing.context, config.context, root_is_wildcard, merge_cache)

  existing.reaches_into_outer_context = [existing.reaches_into_outer_context, config.reaches_into_outer_context].max

  if config.precedence_filter_suppressed?
    existing.precedence_filter_suppressed(true)
  end

  existing.context = merged
  true
end
alts() click to toggle source
# File lib/antlr4/runtime/atn_config_set.rb, line 22
def alts
  alts = BitSet.new
  i = 0
  while i < @configs.length
    config = @configs[i]
    alts.set(config.alt)
    i += 1
  end
  alts
end
empty?() click to toggle source
# File lib/antlr4/runtime/atn_config_set.rb, line 78
def empty?
  @config_lookup.empty?
end
find_first_rule_stop_state() click to toggle source
# File lib/antlr4/runtime/atn_config_set.rb, line 63
def find_first_rule_stop_state
  result = nil

  i = 0
  while i < @configs.length
    config = @configs[i]
    if config.state.is_a? RuleStopState
      result = config
      break
    end
    i += 1
  end
  result
end
optimize_configs(interpreter) click to toggle source
# File lib/antlr4/runtime/atn_config_set.rb, line 116
def optimize_configs(interpreter)
  raise IllegalStateException, 'This set is readonly' if @readonly
  return if @config_lookup.empty?

  i = 0
  while i < @configs.length
    config = @configs[i]
    config.context = interpreter.cached_context(config.context)
    i += 1
  end
end
size() click to toggle source
# File lib/antlr4/runtime/atn_config_set.rb, line 142
def size
  @configs.length
end
to_s() click to toggle source
# File lib/antlr4/runtime/atn_config_set.rb, line 82
def to_s
  buf = ''
  buf << '<'
  i = 0
  while i < @configs.length
    c = @configs[i]
    buf << c.to_s << ' '
    i += 1
  end
  buf << '>'

  if @has_semantic_context
    buf << ',hasSemanticContext=' << @has_semantic_context.to_s
  end
  buf << ',uniqueAlt=' << @unique_alt if @unique_alt != ATN::INVALID_ALT_NUMBER
  unless @conflictingAlts.nil?
    buf << ',conflictingAlts=' << @conflictingAlts.to_s
  end
  buf << ',dipsIntoOuterContext' if @dips_into_outer_context
  buf
end