74 lines
2.3 KiB
Ruby
74 lines
2.3 KiB
Ruby
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# frozen_string_literal: true
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module SassC
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class FunctionsHandler
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def initialize(options)
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@options = options
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end
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def setup(native_options)
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@callbacks = {}
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@function_names = {}
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list = Native.make_function_list(Script.custom_functions.count)
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# use an anonymous class wrapper to avoid mutations in a threaded environment
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functions = Class.new do
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attr_accessor :options
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include Script::Functions
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end.new
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functions.options = @options
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Script.custom_functions.each_with_index do |custom_function, i|
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@callbacks[custom_function] = FFI::Function.new(:pointer, [:pointer, :pointer]) do |native_argument_list, cookie|
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begin
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function_arguments = arguments_from_native_list(native_argument_list)
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result = functions.send(custom_function, *function_arguments)
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to_native_value(result)
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rescue StandardError => exception
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# This rescues any exceptions that occur either in value conversion
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# or during the execution of a custom function.
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error(exception.message)
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end
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end
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@function_names[custom_function] = Script.formatted_function_name(custom_function)
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callback = Native.make_function(
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@function_names[custom_function],
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@callbacks[custom_function],
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nil
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)
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Native::function_set_list_entry(list, i, callback)
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end
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Native::option_set_c_functions(native_options, list)
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end
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private
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def arguments_from_native_list(native_argument_list)
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native_argument_list_length = Native.list_get_length(native_argument_list)
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(0...native_argument_list_length).map do |i|
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native_value = Native.list_get_value(native_argument_list, i)
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Script::ValueConversion.from_native(native_value, @options)
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end.compact
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end
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def to_native_value(sass_value)
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# if the custom function returns nil, we provide a "default" return
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# value of an empty string
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sass_value ||= SassC::Script::Value::String.new("")
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sass_value.options = @options
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Script::ValueConversion.to_native(sass_value)
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end
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def error(message)
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$stderr.puts "[SassC::FunctionsHandler] #{message}"
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Native.make_error(message)
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end
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end
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end
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