Class: Dentaku::AST::StringFunctions::Left
- Defined in:
- lib/dentaku/ast/functions/string_functions.rb
Constant Summary
Constants inherited from Function
Instance Method Summary collapse
-
#initialize(*args) ⇒ Left
constructor
A new instance of Left.
- #value(context = {}) ⇒ Object
Methods inherited from Base
#negative_argument_failure, #type
Methods inherited from Function
#dependencies, get, numeric, register, register_class, registry
Methods inherited from Node
arity, #dependencies, peek, precedence
Constructor Details
#initialize(*args) ⇒ Left
Returns a new instance of Left.
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# File 'lib/dentaku/ast/functions/string_functions.rb', line 20 def initialize(*args) super @string, @length = *@args end |
Instance Method Details
#value(context = {}) ⇒ Object
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# File 'lib/dentaku/ast/functions/string_functions.rb', line 25 def value(context = {}) string = @string.value(context).to_s length = @length.value(context) negative_argument_failure('LEFT') if length < 0 string[0, length] end |