Module: Postsvg::Visitors::PsVisitor::Common

Included in:
Postsvg::Visitors::PsVisitor
Defined in:
lib/postsvg/visitors/ps_visitor/common.rb

Overview

Helpers shared across multiple visitor modules. Mixed into PsVisitor so every module sees the same helpers without re-defining them. DRY: previously normalize_key existed in both Dictionary and Container.

Instance Method Summary collapse

Instance Method Details

#lookup_dict(name) ⇒ Object 



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# File 'lib/postsvg/visitors/ps_visitor/common.rb', line 46

def lookup_dict(name)
  @dict_stack.reverse_each do |dict|
    return dict[name] if dict.key?(name)
  end
  nil
end

#normalize_key(key) ⇒ Object

Convert a key from any literal-typed value to the canonical string form used in dictionary lookups.



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# File 'lib/postsvg/visitors/ps_visitor/common.rb', line 13

def normalize_key(key)
  case key
  when Model::Literals::Name then key.value
  when String then key.to_s.sub(/\A\//, "")
  else key.to_s
  end
end

#numeric_value(value) ⇒ Object

Resolve a value to a number, looking up names in the dict stack when possible. Falls back to 0 for unknown values.



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# File 'lib/postsvg/visitors/ps_visitor/common.rb', line 34

def numeric_value(value)
  case value
  when Numeric then value
  when Model::Literals::Number then value.value
  when Model::Literals::Name
    entry = lookup_dict(value.value)
    entry ? numeric_value(entry) : 0
  when Model::Computed then 0
  else 0
  end
end

#string_value(node) ⇒ Object

Coerce a runtime value to its underlying string content (handles StringLiteral / HexLiteral / plain String).



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# File 'lib/postsvg/visitors/ps_visitor/common.rb', line 23

def string_value(node)
  case node
  when String then node
  when Model::Literals::StringLiteral then node.value
  when Model::Literals::HexLiteral then node.bytes
  else nil
  end
end

#truthy?(value) ⇒ Boolean

PS truthiness: false, nil, and 0 are falsy. Everything else (including the integer 1 and any non-zero Numeric, plus any object) is truthy.

Returns:



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# File 'lib/postsvg/visitors/ps_visitor/common.rb', line 56

def truthy?(value)
  return false if [false, nil].include?(value)

  return value != 0 if value.is_a?(Numeric)

  true
end