Class: Dentaku::PrintVisitor
- Inherits:
-
Object
- Object
- Dentaku::PrintVisitor
- Defined in:
- lib/dentaku/print_visitor.rb
Instance Method Summary collapse
-
#initialize(node) ⇒ PrintVisitor
constructor
A new instance of PrintVisitor.
- #to_s ⇒ Object
- #visit_access(node) ⇒ Object
- #visit_case(node) ⇒ Object
- #visit_case_conditional(node) ⇒ Object
- #visit_else(node) ⇒ Object
- #visit_function(node) ⇒ Object
- #visit_identifier(node) ⇒ Object
- #visit_literal(node) ⇒ Object
- #visit_negation(node) ⇒ Object
- #visit_nil(node) ⇒ Object
- #visit_operand(node, precedence, prefix: "", suffix: "") ⇒ Object
- #visit_operation(node) ⇒ Object
- #visit_switch(node) ⇒ Object
- #visit_then(node) ⇒ Object
- #visit_when(node) ⇒ Object
Constructor Details
#initialize(node) ⇒ PrintVisitor
Returns a new instance of PrintVisitor.
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# File 'lib/dentaku/print_visitor.rb', line 3 def initialize(node) @output = '' node.accept(self) end |
Instance Method Details
#to_s ⇒ Object
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# File 'lib/dentaku/print_visitor.rb', line 97 def to_s @output end |
#visit_access(node) ⇒ Object
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# File 'lib/dentaku/print_visitor.rb', line 78 def visit_access(node) node.structure.accept(self) @output << "[" node.index.accept(self) @output << "]" end |
#visit_case(node) ⇒ Object
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# File 'lib/dentaku/print_visitor.rb', line 39 def visit_case(node) @output << "CASE " node.switch.accept(self) node.conditions.each { |c| c.accept(self) } node.else && node.else.accept(self) @output << " END" end |
#visit_case_conditional(node) ⇒ Object
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# File 'lib/dentaku/print_visitor.rb', line 51 def visit_case_conditional(node) node.when.accept(self) node.then.accept(self) end |
#visit_else(node) ⇒ Object
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# File 'lib/dentaku/print_visitor.rb', line 66 def visit_else(node) @output << " ELSE " node.node.accept(self) end |
#visit_function(node) ⇒ Object
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# File 'lib/dentaku/print_visitor.rb', line 28 def visit_function(node) @output << node.name @output << "(" arg_count = node.args.length node.args.each_with_index do |a, index| a.accept(self) @output << ", " unless index >= arg_count - 1 end @output << ")" end |
#visit_identifier(node) ⇒ Object
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# File 'lib/dentaku/print_visitor.rb', line 89 def visit_identifier(node) @output << node.identifier end |
#visit_literal(node) ⇒ Object
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# File 'lib/dentaku/print_visitor.rb', line 85 def visit_literal(node) @output << node.quoted end |
#visit_negation(node) ⇒ Object
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# File 'lib/dentaku/print_visitor.rb', line 71 def visit_negation(node) @output << "-" @output << "(" unless node.node.is_a? Dentaku::AST::Literal node.node.accept(self) @output << ")" unless node.node.is_a? Dentaku::AST::Literal end |
#visit_nil(node) ⇒ Object
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# File 'lib/dentaku/print_visitor.rb', line 93 def visit_nil(node) @output << "NULL" end |
#visit_operand(node, precedence, prefix: "", suffix: "") ⇒ Object
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# File 'lib/dentaku/print_visitor.rb', line 20 def visit_operand(node, precedence, prefix: "", suffix: "") @output << prefix @output << "(" if node.is_a?(Dentaku::AST::Operation) && node.class.precedence < precedence node.accept(self) @output << ")" if node.is_a?(Dentaku::AST::Operation) && node.class.precedence < precedence @output << suffix end |
#visit_operation(node) ⇒ Object
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# File 'lib/dentaku/print_visitor.rb', line 8 def visit_operation(node) if node.left visit_operand(node.left, node.class.precedence, suffix: " ") end @output << node.display_operator if node.right visit_operand(node.right, node.class.precedence, prefix: " ") end end |
#visit_switch(node) ⇒ Object
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# File 'lib/dentaku/print_visitor.rb', line 47 def visit_switch(node) node.node.accept(self) end |
#visit_then(node) ⇒ Object
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# File 'lib/dentaku/print_visitor.rb', line 61 def visit_then(node) @output << " THEN " node.node.accept(self) end |
#visit_when(node) ⇒ Object
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# File 'lib/dentaku/print_visitor.rb', line 56 def visit_when(node) @output << " WHEN " node.node.accept(self) end |