Class: SyntaxTree::YARV::Compiler::RubyVisitor

Inherits:
BasicVisitor
  • Object
show all
Defined in:
lib/syntax_tree/yarv/compiler.rb

Overview

This visitor is responsible for converting Syntax Tree nodes into their corresponding Ruby structures. This is used to convert the operands of some instructions like putobject that push a Ruby object directly onto the stack. It is only used when the entire structure can be represented at compile-time, as opposed to constructed at run-time.

Direct Known Subclasses

Assembler::ObjectVisitor

Defined Under Namespace

Classes: CompilationError

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from BasicVisitor

valid_visit_methods, #visit, #visit_all, #visit_child_nodes, visit_method, visit_methods

Class Method Details

.compile(node) ⇒ Object

This will attempt to compile the given node. If it’s possible, then it will return the compiled object. Otherwise it will return nil.



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# File 'lib/syntax_tree/yarv/compiler.rb', line 122

def self.compile(node)
  node.accept(new)
rescue CompilationError
end

Instance Method Details

#visit_regexp_literal_flags(node) ⇒ Object

This isn’t actually a visit method, though maybe it should be. It is responsible for converting the set of string options on a regular expression into its equivalent integer.



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# File 'lib/syntax_tree/yarv/compiler.rb', line 249

def visit_regexp_literal_flags(node)
  node
    .options
    .chars
    .inject(0) do |accum, option|
      accum |
        case option
        when "i"
          Regexp::IGNORECASE
        when "x"
          Regexp::EXTENDED
        when "m"
          Regexp::MULTILINE
        else
          raise "Unknown regexp option: #{option}"
        end
    end
end

#visit_unsupported(_node) ⇒ Object

Raises:



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# File 'lib/syntax_tree/yarv/compiler.rb', line 268

def visit_unsupported(_node)
  raise CompilationError
end