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module ExpressTemplates
# Tracks current indent level scoped to the current thread.
#
# May be used to track multiple indents simultaneously through
# namespacing.
class Indenter
DEFAULT = 2
WHITESPACE = " "*DEFAULT
# Returns whitespace for the named indenter or yields to a block
# for the named indentor.
#
# The block is passed the current whitespace indent.
#
# For convenience an optional second parameter is passed to the block
# containing a newline at the beginning of the indent.
def self.for name
if block_given?
current_indenters[name] += 1
begin
indent = WHITESPACE * current_indenters[name]
yield indent, "\n#{indent}"
ensure
if current_indenters[name].eql?(-1)
# if we have long-lived threads for some reason
# we want to clean up after ourselves
current_indenters.delete(name)
else
current_indenters[name] -= 1
end
end
else
return WHITESPACE * current_indenters[name]
end
end
private
# For thread safety, scope indentation to the current thread
def self.current_indenters
Thread.current[:indenters] ||= Hash.new {|hsh, key| hsh[key] = -1 }
end
end
end
Version data entries
68 entries across 68 versions & 2 rubygems