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Contents
require 'strscan'
##
# Tool for expanding template files.
#
# Used for generating files like confugaration file for given HW target
#
########################################################################
class TemplateExpander
## Describes an expansion rule.
Rule = Struct.new(:match,:action)
# Creates a new template expander with potential list of +rules+.
def initialize(rules= [])
# Setup the rules.
@rules = rules.map do |match,action|
# Ensures action is a proc.
action = proc { |str| action.to_s } unless action.is_a?(Proc)
# Create the rule.
Rule.new(Regexp.new(match), action)
end
# The skip regexp is empty, it has to be built with finalize.
@skip = nil
end
# Adds a +rule+.
def add_rule(*rule)
@rules << Rule.new(Regexp.new(rule[0]), rule[1])
end
# Finalize the expander by building the default rule.
def finalize
# @skip = Regexp.union(*@rules.map { |rule| rule.match })
@skip = /(?=#{Regexp.union(*@rules.map { |rule| rule.match }).source})|\z/
end
# Apply the expander to +str+ and put the result in +res+.
def expand(str,res = "")
# Ensure the default rule is properly set up.
self.finalize
# Scan the string with each rule.
scanner = StringScanner.new(str)
until scanner.eos? do
@rules.find do |rule|
scanned = scanner.scan(rule.match)
if scanned then
res << rule.action.call(scanned)
else
false
end
end
res << scanner.scan_until(@skip)
end
return res
end
end
Version data entries
48 entries across 48 versions & 1 rubygems