Class: SoftLayer::ObjectMaskParser
- Inherits:
-
Object
- Object
- SoftLayer::ObjectMaskParser
- Defined in:
- lib/softlayer/ObjectMaskParser.rb
Overview
A parser that can examine and validate SoftLayer Object Mask strings
The Object Mask Parser parses Object Mask Strings into ObjectMaskProperty structures.
The Object Mask parser allows the Gem to merge Object Mask Strings to avoid errors from the SoftLayer API server about duplicate properties being provided when the same property is provided in different Object Masks
Instance Attribute Summary collapse
-
#stack ⇒ Object
readonly
Returns the value of attribute stack.
Instance Method Summary collapse
-
#initialize ⇒ ObjectMaskParser
constructor
A new instance of ObjectMaskParser.
- #parse(mask_string) ⇒ Object
- #parse_property(tokenizer) ⇒ Object
- #parse_property_child(tokenizer) ⇒ Object
- #parse_property_name(tokenizer) ⇒ Object
- #parse_property_sequence(tokenizer) ⇒ Object
- #parse_property_set(tokenizer) ⇒ Object
- #parse_property_type(tokenizer) ⇒ Object
- #parse_property_type_name(tokenizer) ⇒ Object
- #recognize_token(tokenizer, expected_type, error_string, &predicate) ⇒ Object
Constructor Details
#initialize ⇒ ObjectMaskParser
Returns a new instance of ObjectMaskParser.
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# File 'lib/softlayer/ObjectMaskParser.rb', line 43 def initialize() @stack = [] end |
Instance Attribute Details
#stack ⇒ Object (readonly)
Returns the value of attribute stack.
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# File 'lib/softlayer/ObjectMaskParser.rb', line 41 def stack @stack end |
Instance Method Details
#parse(mask_string) ⇒ Object
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# File 'lib/softlayer/ObjectMaskParser.rb', line 47 def parse(mask_string) @tokenizer = ObjectMaskTokenizer.new(mask_string) token = @tokenizer.current_token if token.type == :identifier property = parse_property(@tokenizer) elsif token.type == :property_set_start property_set = parse_property_set(@tokenizer) else raise ObjectMaskParserError, "A valid Object mask is a 'mask' or 'filterMask' root property, or a property set containing root properties" + ObjectMaskToken.error_for_unexpected_token(token) end recognize_token(@tokenizer, :eos, "Extraneous text after object mask: ") if property && (property.name != "mask" && property.name != "filterMask") raise ObjectMaskParserError, "Object Mask must begin with a 'mask' or 'filterMask' root property" end if property_set && property_set.find { |subproperty| subproperty.name != 'mask' && subproperty.name != 'filterMask' } raise ObjectMaskParserError, "A root property set must contain only 'mask' or 'filterMask' root properties" end property || property_set end |
#parse_property(tokenizer) ⇒ Object
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# File 'lib/softlayer/ObjectMaskParser.rb', line 95 def parse_property (tokenizer) property_name = nil property_type = nil property_children = nil property_name = parse_property_name(tokenizer) # look for a property type property_type = nil token = tokenizer.current_token if(token.type.equal?(:property_type_start)) property_type = parse_property_type(tokenizer) end token = tokenizer.current_token if(token.type.equal?(:property_child_separator)) property_children = [ parse_property_child(tokenizer) ] elsif (token.type.equal?(:property_set_start)) property_children = parse_property_set(tokenizer) end new_property = ObjectMaskProperty.new(property_name, property_type) new_property.add_children(property_children) if property_children return new_property end |
#parse_property_child(tokenizer) ⇒ Object
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# File 'lib/softlayer/ObjectMaskParser.rb', line 122 def parse_property_child(tokenizer) token = recognize_token(tokenizer, :property_child_separator, "Expected a '.': ") parse_property(tokenizer) end |
#parse_property_name(tokenizer) ⇒ Object
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# File 'lib/softlayer/ObjectMaskParser.rb', line 127 def parse_property_name(tokenizer) token = recognize_token(tokenizer, :identifier, "Expected a valid property type: ") { |token| token.valid_property_name? } return token.value end |
#parse_property_sequence(tokenizer) ⇒ Object
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# File 'lib/softlayer/ObjectMaskParser.rb', line 79 def parse_property_sequence(tokenizer) first_property = parse_property(tokenizer) other_children = [] token = tokenizer.current_token if(token.type.equal?(:property_set_separator)) # skip the separator tokenizer.next_token # find another property other_children = parse_property_sequence(tokenizer) end return other_children.unshift(first_property) end |
#parse_property_set(tokenizer) ⇒ Object
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# File 'lib/softlayer/ObjectMaskParser.rb', line 72 def parse_property_set(tokenizer) token = recognize_token(tokenizer, :property_set_start, "Expected '[': ") property_sequence = parse_property_sequence(tokenizer) token = recognize_token(tokenizer, :property_set_end, "Expected ']': ") property_sequence end |
#parse_property_type(tokenizer) ⇒ Object
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# File 'lib/softlayer/ObjectMaskParser.rb', line 132 def parse_property_type(tokenizer) token = recognize_token(tokenizer, :property_type_start, "Expected '(': ") property_type = parse_property_type_name(tokenizer) token = recognize_token(tokenizer, :property_type_end, "Expected ')': ") return property_type end |
#parse_property_type_name(tokenizer) ⇒ Object
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# File 'lib/softlayer/ObjectMaskParser.rb', line 139 def parse_property_type_name(tokenizer) token = recognize_token(tokenizer, :identifier, "Expected a valid property type: ") { |token| token.valid_property_type? } return token.value end |
#recognize_token(tokenizer, expected_type, error_string, &predicate) ⇒ Object
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# File 'lib/softlayer/ObjectMaskParser.rb', line 144 def recognize_token(tokenizer, expected_type, error_string, &predicate) token = tokenizer.current_token if token.type.equal?(expected_type) && (!predicate || predicate.call(token)) tokenizer.next_token else raise ObjectMaskParserError, error_string + ObjectMaskToken.error_for_unexpected_token(token) token = nil; end return token end |