Class: Opal::Nodes::StringNode
- Defined in:
- opal/lib/opal/nodes/literal.rb
Constant Summary collapse
- ESCAPE_CHARS =
{ 'a' => '\\u0007', 'e' => '\\u001b' }.freeze
- ESCAPE_REGEX =
/(\\+)([#{ ESCAPE_CHARS .keys.join('') }])/.freeze
Instance Attribute Summary
Attributes inherited from Base
Attributes included from Closure::NodeSupport
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_empty , #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 Closure::NodeSupport
#closure_is? , #compile_catcher , #generate_thrower , #generate_thrower_without_catcher , #in_closure , #pop_closure , #push_closure , #select_closure , #thrower
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::Base
Instance Method Details
#compile ⇒ Object
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# File 'opal/lib/opal/nodes/literal.rb', line 60 def compile string_value = value sanitized_value = string_value.inspect.gsub(/\\u\{([0-9a-f]+)\}/) do code_point = Regexp.last_match(1).to_i(16) to_utf16(code_point) end push translate_escape_chars(sanitized_value) if RUBY_ENGINE != 'opal' encoding = string_value.encoding unless encoding == Encoding::UTF_8 helper :enc wrap "$enc(", ", \"#{encoding.name}\")" end end unless value.valid_encoding? helper :binary wrap "$binary(", ")" end end
#to_utf16(code_point) ⇒ Object
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# File 'opal/lib/opal/nodes/literal.rb', line 85 def to_utf16(code_point) ten_bits = 0b1111111111 u = ->(code_unit) { '\\u' + code_unit.to_s(16).upcase } return u.call(code_point) if code_point <= 0xFFFF code_point -= 0x10000 # Shift right to get to most significant 10 bits lead_surrogate = 0xD800 + (code_point >> 10) # Mask to get least significant 10 bits tail_surrogate = 0xDC00 + (code_point & ten_bits) u.call(lead_surrogate) + u.call(tail_surrogate) end
#translate_escape_chars(inspect_string) ⇒ Object
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# File 'opal/lib/opal/nodes/literal.rb', line 50 def translate_escape_chars(inspect_string) inspect_string.gsub(ESCAPE_REGEX ) do |original| if Regexp.last_match(1).length.even? original else Regexp.last_match(1).chop + ESCAPE_CHARS [Regexp.last_match(2)] end end end