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module Treetop
module Compiler
class PredicateBlock < ParsingExpression
def compile(index, builder, parent_expression = nil)
super
# REVISIT: This is distinctly dodgey, but since we can only be called from
# two contexts, and it works in both those, I'm going with it for now, as
# opposed to doing the major refactor of providing a proper way of accessing
# the parent's accumulator variable.
p = parent
p = p.parent while p && !p.respond_to?(:accumulator_var)
assign_result "lambda #{text_value}.call(#{p ? p.accumulator_var : ""})"
builder.if_ '!'+result_var do
builder << "terminal_parse_failure(#{expected})"
end
end
def expected
'"<semantic predicate>"' # Should I include (some of) the text_value here?
end
end
end
end
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