Sha256: e274b247f990e278a417673785aee286fe5ed1c7b99711ce7167ce884f95b995
Contents?: true
Size: 1.3 KB
Versions: 8
Compression:
Stored size: 1.3 KB
Contents
# A tree structure that contains parse error messages. This can be used to
# give the user a detailed report on what went wrong during a parse.
#
class Parslet::ErrorTree
# The parslet that caused the error stored here.
attr_reader :parslet
# All errors that were encountered when parsing part of this +parslet+.
attr_reader :children
def initialize(parslet, *children) # :nodoc:
@parslet = parslet
@children = children.compact
end
def nodes
1 + children.inject(0) { |sum, node| sum + node.nodes }
end
def cause
parslet.cause || "Unknown error in #{parslet.inspect}"
end
# Returns an ascii tree representation of the causes of this node and its
# children.
#
def ascii_tree
StringIO.new.tap { |io|
recursive_ascii_tree(self, io, [true]) }.
string
end
alias to_s ascii_tree
private
def recursive_ascii_tree(node, stream, curved) # :nodoc:
append_prefix(stream, curved)
stream.puts node.cause
node.children.each do |child|
last_child = (node.children.last == child)
recursive_ascii_tree(child, stream, curved + [last_child])
end
end
def append_prefix(stream, curved) # :nodoc:
curved[0..-2].each do |c|
stream.print c ? " " : "| "
end
stream.print curved.last ? "`- " : "|- "
end
end
Version data entries
8 entries across 8 versions & 1 rubygems