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# Matches a string of characters.
#
# Example:
#
# str('foo') # matches 'foo'
#
class Parslet::Atoms::Str < Parslet::Atoms::Base
attr_reader :str
def initialize(str)
super()
@str = str.to_s
@pat = Regexp.new(Regexp.escape(str))
@len = str.size
@error_msgs = {
:premature => "Premature end of input",
:failed => "Expected #{str.inspect}, but got "
}
end
def try(source, context, consume_all)
return succ(source.consume(@len)) if source.matches?(@pat)
# Input ending early:
return context.err(self, source, @error_msgs[:premature]) \
if source.chars_left<@len
# Expected something, but got something else instead:
error_pos = source.pos
return context.err_at(
self, source,
[@error_msgs[:failed], source.consume(@len)], error_pos)
end
def to_s_inner(prec)
"'#{str}'"
end
end
|
