class Phlex::Compiler::Formatter

def append(&block)
	@appending = true
	unless @open_string_append
		if @open_chain_append
			text ' << "'
		else
			text '@_target << "'
		end
		@open_chain_append = false
		@open_string_append = true
	end
	yield(self)
	@appending = false
end

def breakable(*args, **kwargs)
	if !@texting && @open_string_append
		@broken = kwargs
	else
		super
	end
end

def chain_append(&block)
	@appending = true
	if @open_string_append
		text '" << '
	elsif @open_chain_append
		text " << "
	else
		text "@_target << "
	end
	@open_string_append = false
	@open_chain_append = true
	yield(self)
	@appending = false
end

def flush
	text "" if @open_string_append
	super
end

def format(node, stackable: true)
	stack << node if stackable
	doc = node.format(self)
	stack.pop if stackable
	doc
end

def genspace
	-> (n) { "\t" * (n / 2) }
end

def text(value, ...)
	@texting = true
	unless @appending
		if @open_string_append
			super('"')
			@open_string_append = false
		end
		@open_chain_append = false
		breakable(**@broken) if @broken
	end
	@broken = false
	super
	@texting = false
end