Class: Opal::Nodes::TopNode

Inherits:
ScopeNode show all
Defined in:
opal/lib/opal/nodes/top.rb

Overview

Generates code for an entire file, i.e. the base sexp

Instance Attribute Summary

Attributes inherited from ScopeNode

#await_encountered, #block_name, #catch_return, #defs, #gvars, #has_break, #has_retry, #identity, #ivars, #locals, #methods, #mid, #name, #parent, #rescue_else_sexp, #scope_name

Attributes inherited from Base

#compiler, #sexp, #type

Instance Method Summary collapse

Methods inherited from ScopeNode

#accepts_using?, #add_arg, #add_proto_ivar, #add_scope_gvar, #add_scope_ivar, #add_scope_local, #add_scope_temp, #class?, #class_scope?, #collect_refinements_temps, #current_rescue, #def?, #def_in_class?, #defines_lambda, #find_parent_def, #gen_retry_id, #has_local?, #has_rescue_else?, #has_temp?, #identify!, #in_ensure, #in_ensure?, #in_resbody, #in_resbody?, #in_rescue, #in_scope, #in_while?, #initialize, #is_lambda!, #iter?, #lambda?, #lambda_definition?, #module?, #nesting, #new_refinements_temp, #new_temp, #next_temp, #pop_while, #prepare_block, #push_while, #queue_temp, #refinements_temp, #relative_access, #sclass?, #scope_locals, #self, #super_chain, #to_vars, #top?, #uses_block!, #uses_block?

Methods inherited from Base

#add_gvar, #add_ivar, #add_local, #add_temp, #children, children, #class_variable_owner, #class_variable_owner_nesting_level, #comments, #compile_to_fragments, #error, #expr, #expr?, #expr_or_nil, #fragment, handle, handlers, #has_rescue_else?, #helper, #in_ensure, #in_ensure?, #in_resbody, #in_resbody?, #in_rescue, #in_while?, #initialize, #process, #push, #recv, #recv?, #s, #scope, #source_location, #stmt, #stmt?, #top_scope, truthy_optimize?, #unshift, #while_loop, #with_temp, #wrap

Methods included from Helpers

#current_indent, #empty_line, #indent, #js_truthy, #js_truthy_optimize, #line, #mid_to_jsid, #property, #valid_name?

Constructor Details

This class inherits a constructor from Opal::Nodes::ScopeNode

Instance Method Details

#absolute_const ⇒ Object

Returns '$$$', but also ensures that the '$$$' variable is set



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# File 'opal/lib/opal/nodes/top.rb', line 100

def absolute_const
  @define_absolute_const = true
  '$$$'
end

#add_used_helpers ⇒ Object 



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# File 'opal/lib/opal/nodes/top.rb', line 111

def add_used_helpers
  compiler.helpers.to_a.each { |h| add_temp "$#{h} = Opal.#{h}" }
end

#closing ⇒ Object 



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# File 'opal/lib/opal/nodes/top.rb', line 85

def closing
  if compiler.requirable?
    line "};\n"
  elsif compiler.eval?
    line "})(Opal, self);"
  else
    line "});\n"
  end
end

#compile ⇒ Object 



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# File 'opal/lib/opal/nodes/top.rb', line 15

def compile
  compiler.top_scope = self
  compiler.dynamic_cache_result = true if sexp.meta[:dynamic_cache_result]

  push version_comment

  helper :return_val if compiler.eof_content

  if body == s(:nil)
    # A shortpath for empty (stub?) modules.
    if compiler.requirable? || compiler.esm? || compiler.eval?
      unshift 'Opal.return_val(Opal.nil); '
      definition
    else
      unshift 'Opal.nil; '
    end
  else
    in_scope do
      line '"use strict";' if compiler.use_strict?

      body_code = stmt(stmts)
      body_code = [body_code] unless body_code.is_a?(Array)

      if compiler.eval?
        add_temp '$nesting = self.$$is_a_module ? [self] : [self.$$class]' if @define_nesting
      else
        add_temp 'self = Opal.top' if @define_self
        add_temp '$nesting = []' if @define_nesting
      end
      add_temp '$$ = Opal.$r($nesting)' if @define_relative_access

      add_temp 'nil = Opal.nil'
      add_temp '$$$ = Opal.$$$' if @define_absolute_const

      add_used_helpers
      line scope.to_vars

      compile_method_stubs
      compile_irb_vars
      compile_end_construct

      line body_code
    end

    opening
    definition
    closing
  end
end

#compile_end_construct ⇒ Object

Any special END content in code



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# File 'opal/lib/opal/nodes/top.rb', line 124

def compile_end_construct
  if content = compiler.eof_content
    line 'var $__END__ = Opal.Object.$new();'
    line "$__END__.$read = $return_val(#{content.inspect});"
  end
end

#compile_irb_vars ⇒ Object 



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# File 'opal/lib/opal/nodes/top.rb', line 105

def compile_irb_vars
  if compiler.irb?
    line 'if (!Opal.irb_vars) { Opal.irb_vars = {}; }'
  end
end

#compile_method_stubs ⇒ Object 



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# File 'opal/lib/opal/nodes/top.rb', line 115

def compile_method_stubs
  if compiler.method_missing?
    calls = compiler.method_calls
    stubs = calls.to_a.map(&:to_s).join(',')
    line "Opal.add_stubs('#{stubs}');" unless stubs.empty?
  end
end

#definition ⇒ Object 



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# File 'opal/lib/opal/nodes/top.rb', line 65

def definition
  if compiler.requirable?
    unshift "Opal.modules[#{Opal::Compiler.module_name(compiler.file).inspect}] = "
  elsif compiler.esm?
    unshift 'export default '
  end
end

#opening ⇒ Object 



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# File 'opal/lib/opal/nodes/top.rb', line 73

def opening
  async_prefix = "async " if await_encountered

  if compiler.requirable?
    unshift "#{async_prefix}function(Opal) {"
  elsif compiler.eval?
    unshift "(#{async_prefix}function(Opal, self) {"
  else
    unshift "Opal.queue(#{async_prefix}function(Opal) {"
  end
end

#stmts ⇒ Object 



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# File 'opal/lib/opal/nodes/top.rb', line 95

def stmts
  compiler.returns(body)
end

#version_comment ⇒ Object 



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# File 'opal/lib/opal/nodes/top.rb', line 131

def version_comment
  "/* Generated by Opal #{Opal::VERSION} */"
end