Class: RGen::Util::PatternMatcher
- Inherits:
-
Object
- Object
- RGen::Util::PatternMatcher
- Defined in:
- lib/rgen/util/pattern_matcher.rb
Overview
A PatternMatcher can be used to find, insert and remove patterns on a given model.
A pattern is specified by means of a block passed to the add_pattern method. The block must take an Environment as first parameter and at least one model element as connection point as further parameter. The pattern matches if it can be found in a given environment and connected to the given connection point elements.
Defined Under Namespace
Classes: Bindable, CheckLater, Lazy, Match, Proxy
Instance Attribute Summary collapse
-
#debug ⇒ Object
Returns the value of attribute debug.
Instance Method Summary collapse
- #add_pattern(name, &block) ⇒ Object
- #find_pattern(env, name, *connection_points) ⇒ Object
-
#initialize ⇒ PatternMatcher
constructor
A new instance of PatternMatcher.
- #insert_pattern(env, name, *connection_points) ⇒ Object
- #lazy(&block) ⇒ Object
- #remove_pattern(env, name, *connection_points) ⇒ Object
Constructor Details
#initialize ⇒ PatternMatcher
Returns a new instance of PatternMatcher.
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# File 'lib/rgen/util/pattern_matcher.rb', line 17 def initialize @patterns = {} @insert_mode = false @debug = false end |
Instance Attribute Details
#debug ⇒ Object
Returns the value of attribute debug.
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# File 'lib/rgen/util/pattern_matcher.rb', line 15 def debug @debug end |
Instance Method Details
#add_pattern(name, &block) ⇒ Object
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# File 'lib/rgen/util/pattern_matcher.rb', line 23 def add_pattern(name, &block) raise "a pattern needs at least 2 block parameters: " + "an RGen environment and a model element as connection point" \ unless block.arity >= 2 @patterns[name] = block end |
#find_pattern(env, name, *connection_points) ⇒ Object
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# File 'lib/rgen/util/pattern_matcher.rb', line 30 def find_pattern(env, name, *connection_points) match = find_pattern_internal(env, name, *connection_points) end |
#insert_pattern(env, name, *connection_points) ⇒ Object
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# File 'lib/rgen/util/pattern_matcher.rb', line 34 def insert_pattern(env, name, *connection_points) @insert_mode = true root = evaluate_pattern(name, env, connection_points) @insert_mode = false root end |
#lazy(&block) ⇒ Object
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# File 'lib/rgen/util/pattern_matcher.rb', line 54 def lazy(&block) if @insert_mode block.call else Lazy.new(&block) end end |
#remove_pattern(env, name, *connection_points) ⇒ Object
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# File 'lib/rgen/util/pattern_matcher.rb', line 41 def remove_pattern(env, name, *connection_points) match = find_pattern_internal(env, name, *connection_points) if match match.elements.each do |e| disconnect_element(e) env.delete(e) end match else nil end end |