Class: Enumpath::Operator::Child

Inherits:

Base

• Object
• Base
• Enumpath::Operator::Child

Defined in:

lib/enumpath/operator/child.rb

Overview

Implements JSONPath child operator syntax. See README for syntax and examples.

Instance Attribute Summary

Attributes inherited from Base

#operator

Class Method Summary

• .detect?(operator, enum) ⇒ true, false

  Checks to see if an operator is valid as a child operator.

Instance Method Summary

• #apply(remaining_path, enum, resolved_path) {|remaining_path, enum, resolved_path| ... } ⇒ Object

  Resolves a child operator against an enumerable.

Methods inherited from Base

#initialize

Constructor Details

This class inherits a constructor from Enumpath::Operator::Base

Class Method Details

.detect?(operator, enum) ⇒ true, false

Checks to see if an operator is valid as a child operator. It is considered valid if the enumerable contains an index, key, member, or property that responds to child.

Parameters:

• operator (String) —

  the the full, normalized operator to test

Returns:

• (true, false) —

  whether the operator param appears to represent the operator class

# File 'lib/enumpath/operator/child.rb', line 13

def detect?(operator, enum)
  !Enumpath::Resolver::Simple.resolve(operator, enum).nil? ||
    !Enumpath::Resolver::Property.resolve(operator, enum).nil?
end

Instance Method Details

#apply(remaining_path, enum, resolved_path) {|remaining_path, enum, resolved_path| ... } ⇒ Object

Resolves a child operator against an enumerable. If the child operator matches a index, key, member, or property of the enumerable it is yielded to the block.

Parameters:

• remaining_path (Array) —

  an array containing the normalized path segments yet to be resolved

• enum (Enumerable) —

  the object to apply the operator to

• resolved_path (Array) —

  an array containing the static path segments that have been resolved

Yields:

• A block that will be called if the operator is applied successfully. If the operator cannot or should not be applied then the block is not yielded.

Yield Parameters:

• remaining_path (Array) —

  remaining_path

• enum (Enumerable) —

  the resolved value of the enumerable

• resolved_path (Array) —

  resolved_path plus the child operator

# File 'lib/enumpath/operator/child.rb', line 27

def apply(remaining_path, enum, resolved_path)
  value = Enumpath::Resolver::Simple.resolve(operator, enum)
  value = Enumpath::Resolver::Property.resolve(operator, enum) if value.nil?
  yield(remaining_path, value, resolved_path + [operator]) unless value.nil?
end