Class: Opal::Nodes::XStringNode
- Defined in:
- opal/lib/opal/nodes/x_string.rb
Instance Attribute Summary
Attributes inherited from Base
Attributes included from Closure::NodeSupport
Class Method Summary collapse
-
.single_line?(children) ⇒ Boolean
Check if there's only one child or if they're all part of the same line (e.g. because of interpolations).
-
.strip_empty_children(children) ⇒ Object
Will remove empty :str lines coming from cosmetic newlines in x-strings.
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
Class Method Details
.single_line?(children) ⇒ Boolean
Check if there's only one child or if they're all part of the same line (e.g. because of interpolations)
Returns:
- (Boolean)
48 49 50 51 52
# File 'opal/lib/opal/nodes/x_string.rb', line 48 def self.single_line?(children) (children.size == 1) || children.none? do |c| c.type == :str && c.loc.expression.source.end_with?("\n") end end
.strip_empty_children(children) ⇒ Object
Will remove empty :str lines coming from cosmetic newlines in x-strings
Examples:
# this will generate two additional empty
# children before and after `foo()`
%x{
foo()
}62 63 64 65 66 67 68 69 70
# File 'opal/lib/opal/nodes/x_string.rb', line 62 def self.strip_empty_children(children) children = children.dup empty_line = ->(child) { child.nil? || (child.type == :str && child.loc.expression.source.rstrip.empty?) } children.shift while children.any? && empty_line[children.first] children.pop while children.any? && empty_line[children.last] children end
Instance Method Details
#compile ⇒ Object
8 9 10 11 12 13 14
# File 'opal/lib/opal/nodes/x_string.rb', line 8 def compile if compiler.backtick_javascript_or_warn? compile_javascript else compile_send end end
#compile_javascript ⇒ Object
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44
# File 'opal/lib/opal/nodes/x_string.rb', line 21 def compile_javascript @should_add_semicolon = false unpacked_children = unpack_return(children) stripped_children = XStringNode .strip_empty_children (unpacked_children) if XStringNode .single_line? (stripped_children) # If it's a single line we'll try to: # # - strip empty lines # - remove a trailing `;` # - detect an embedded `return` # - prepend a `return` when needed # - append a `;` when needed # - warn the user not to use the semicolon in single-line x-strings compile_single_line(stripped_children) else # Here we leave to the user the responsibility to add # a return where it's due. unpacked_children.each { |c| compile_child(c) } end wrap '(', ')' if recv? push ';' if @should_add_semicolon end
#compile_send ⇒ Object
16 17 18 19
# File 'opal/lib/opal/nodes/x_string.rb', line 16 def compile_send sexp = s(:send, nil, :`, s(:dstr, *children)) push process(sexp, @level) end