IOReaderFactory takes in an io.Reader and returns a function that will allow you to create a new reader that begins at the start of the stream.

NewDoubleArray builds a DoubleArray from a set of sequences of strings.

StringArrayFlag defines a flag with the specified name and usage string.

OpCapture pops an item and binds it to the variable.

OpConcatN pops N items from stack, concatenates them and pushes it back to stack.

OpEnd is the least positive invalid opcode.

OpLitPush pushes a component to stack if it matches to the literal.

OpNop does nothing.

OpPush pushes a component to stack.

OpPushM concatenates the remaining components and pushes it to stack.

DoubleArray is a Double Array implementation of trie on sequences of strings.

OpCode is an opcode of compiled path patterns.

StringArrayFlags is a wrapper of `[]string` to provider an interface for `flag.Var`.