Class: Liquid2::Filter

Inherits:
Expression show all
Defined in:
lib/liquid2/expressions/filtered.rb

Overview

A Liquid filter with a name and array of arguments.

Instance Attribute Summary collapse

Attributes inherited from Expression

#token

Instance Method Summary collapse

Methods inherited from Expression

#scope

Constructor Details

#initialize(token, name, args) ⇒ Filter

Returns a new instance of Filter.

Parameters:



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# File 'lib/liquid2/expressions/filtered.rb', line 87

def initialize(token, name, args)
  super(token)
  @name = name
  @args = args
end

Instance Attribute Details

#args ⇒ Object (readonly)

Returns the value of attribute args.



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# File 'lib/liquid2/expressions/filtered.rb', line 83

def args
  @args
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/liquid2/expressions/filtered.rb', line 83

def name
  @name
end

Instance Method Details

#children ⇒ Object 



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# File 'lib/liquid2/expressions/filtered.rb', line 128

def children = @args || []

#evaluate(left, context) ⇒ Object 



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# File 'lib/liquid2/expressions/filtered.rb', line 93

def evaluate(left, context)
  filter, with_context = context.env.filters[@name]
  raise LiquidFilterNotFoundError.new("unknown filter #{@name.inspect}", @token) unless filter

  return filter.call(left) if @args.nil? && !with_context # steep:ignore
  return filter.call(left, context: context) if @args.nil? && with_context # steep:ignore

  positional_args = [] # @type var positional_args: Array[untyped]
  keyword_args = {} # @type var keyword_args: Hash[Symbol, untyped]

  index = 0
  loop do
    # `@args[index]` could be `false` or `nil`
    break if index >= @args.length # steep:ignore

    arg = @args[index] # steep:ignore
    index += 1
    if arg.respond_to?(:sym)
      keyword_args[arg.sym] = context.evaluate(arg.value)
    else
      positional_args << context.evaluate(arg)
    end
  end

  keyword_args[:context] = context if with_context

  if keyword_args.empty?
    filter.call(left, *positional_args) # steep:ignore
  else
    filter.call(left, *positional_args, **keyword_args) # steep:ignore
  end
rescue ArgumentError, TypeError => e
  raise LiquidArgumentError.new(e.message, @token)
end