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#!/usr/bin/ruby
# encoding: utf-8
module ANTLR3
module Debug
=begin rdoc ANTLR3::Debug::EventListener
A listener that simply records text representations of the events.
Useful for debugging the debugging facility ;)
Subclasses can override the record() method (which defaults to printing to
stdout) to record the events in a different way.
=end
class TraceEventListener
include EventListener
def initialize( adaptor = nil, device = $stderr )
super()
@device = device
@adaptor = adaptor ||= ANTLR3::AST::CommonTreeAdaptor.new
end
def record( event_message, *interpolation_arguments )
event_message = event_message.to_s << "\n"
@device.printf( event_message, *interpolation_arguments )
end
def enter_alternative( alt_number )
record "(%s): number=%s", __method__, alt_number
end
def enter_rule( grammar_file_name, rule_name )
record "(%s): rule=%s", __method__, rule_name
end
def exit_rule( grammar_file_name, rule_name )
record "(%s): rule=%s", __method__, rule_name
end
def enter_subrule( decision_number )
record "(%s): decision=%s", __method__, decision_number
end
def exit_subrule( decision_number )
record "(%s): decision=%s", __method__, decision_number
end
def location( line, position )
record '(%s): line=%s position=%s', __method__, line, position
end
def consume_node( tree )
record '(%s) unique_id=%s text=%p type=%s[%s]', __method__, @adaptor.unique_id( tree ),
@adaptor.text_of( tree ), @adaptor.type_name( tree ), @adaptor.type_of( tree )
end
def look( i, tree )
record '(%s): k=%s unique_id=%s text=%p type=%s[%s]', __method__, i, @adaptor.unique_id( tree ),
@adaptor.text_of( tree ), @adaptor.type_name( tree ), @adaptor.type_of( tree )
end
def flat_node( tree )
record '(%s): unique_id=%s', __method__, @adaptor.unique_id( tree )
end
def create_node( tree, token = nil )
unless token
record '(%s): unique_id=%s text=%p type=%s[%s]', __method__, @adaptor.unique_id( tree ),
@adaptor.text_of( tree ), @adaptor.type_name( tree ), @adaptor.type_of( tree )
else
record '(%s): unique_id=%s type=%s[%s]', __method__, @adaptor.unique_id( tree ),
@adaptor.type_of( tree ), @adaptor.type_name( tree ), @adaptor.type_of( tree )
end
end
def become_root( new_root, old_root )
record '(%s): old_root_id=%s new_root_id=%s', __method__, @adaptor.unique_id( new_root ),
@adaptor.unique_id( old_root )
end
def add_child( root, child )
record '(%s): root_id=%s child_id=%s', __method__, @adaptor.unique_id( root ),
@adaptor.unique_id( child )
end
def set_token_boundaries( tree, token_start_index, token_stop_index )
record '(%s): unique_id=%s index_range=%s..%s', __method__, @adaptor.unique_id( tree ),
token_start_index, token_stop_index
end
end # class TraceEventListener
end # module Debug
end # module ANTLR3
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