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Class: Opal::Nodes::HashNode

Inherits:
Base
  • Object
  • Base
  • Opal::Nodes::HashNode
show all
Defined in:
opal/lib/opal/nodes/hash.rb

Instance Attribute Summary collapse

Attributes inherited from Base

#compiler , #type

Instance Method Summary collapse

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_while? , #process , #push , #recv , #recv? , #s , #scope , #stmt , #stmt? , truthy_optimize? , #unshift , #while_loop , #with_temp , #wrap

Methods included from Helpers

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

Constructor Details

#initialize ⇒ HashNode

Returns a new instance of HashNode

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# File 'opal/lib/opal/nodes/hash.rb', line 12
def initialize(*)
 super
 @has_kwsplat = false
 @keys = []
 @values = []
 children.each do |child|
 case child.type
 when :kwsplat
 @has_kwsplat = true
 when :pair
 @keys << child.children[0]
 @values << child.children[1]
 end
 end
end

Instance Attribute Details

#has_kwsplat ⇒ Object

Returns the value of attribute has_kwsplat

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# File 'opal/lib/opal/nodes/hash.rb', line 10
def has_kwsplat
 @has_kwsplat
end

#keys ⇒ Object

Returns the value of attribute keys

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# File 'opal/lib/opal/nodes/hash.rb', line 10
def keys
 @keys
end

#values ⇒ Object

Returns the value of attribute values

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# File 'opal/lib/opal/nodes/hash.rb', line 10
def values
 @values
end

Instance Method Details

#compile ⇒ Object 

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# File 'opal/lib/opal/nodes/hash.rb', line 33
def compile
 if has_kwsplat
 compile_merge
 elsif simple_keys?
 compile_hash2
 else
 compile_hash
 end
end

#compile_hash ⇒ Object

Compiles a hash without kwsplats with complex keys.

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# File 'opal/lib/opal/nodes/hash.rb', line 80
def compile_hash
 helper :hash
 children.each_with_index do |pair, idx|
 key, value = pair.children
 push ', ' unless idx == 0
 push expr(key), ', ', expr(value)
 end
 wrap '$hash(', ')'
end

#compile_hash2 ⇒ Object

Compiles a hash without kwsplats and containing only string/symbols as keys.

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# File 'opal/lib/opal/nodes/hash.rb', line 94
def compile_hash2
 hash_obj, hash_keys = {}, []
 helper :hash2
 keys.size.times do |idx|
 key = keys[idx].children[0].to_s.inspect
 hash_keys << key unless hash_obj.include? key
 hash_obj[key] = expr(values[idx])
 end
 hash_keys.each_with_index do |key, idx|
 push ', ' unless idx == 0
 push "#{key}: "
 push hash_obj[key]
 end
 wrap "$hash2([#{hash_keys.join ', '}], {", '})'
end

#compile_merge ⇒ Object

Compiles hashes containing kwsplats inside. hash like { *{ nested: 1 }, a: 1, *{ nested: 2} } should be compiled to { nested: 1}.merge(a: 1).merge(nested: 2) Each kwsplat overrides previosly defined keys Hash k/v pairs override previously defined kwsplat values

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# File 'opal/lib/opal/nodes/hash.rb', line 49
def compile_merge
 helper :hash
 result, seq = [], []
 children.each do |child|
 if child.type == :kwsplat
 unless seq.empty?
 result << expr(s(:hash, *seq))
 end
 result << expr(child)
 seq = []
 else
 seq << child
 end
 end
 unless seq.empty?
 result << expr(s(:hash, *seq))
 end
 result.each_with_index do |fragment, idx|
 if idx == 0
 push fragment
 else
 push '.$merge(', fragment, ')'
 end
 end
end

#simple_keys? ⇒ Boolean

Returns:

  • (Boolean) 
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# File 'opal/lib/opal/nodes/hash.rb', line 29
def simple_keys?
 keys.all? { |key| %i[symstr].include?(key.type) }
end

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