Class: LazyGraph::Context

Inherits:
Object
  • Object
show all
Defined in:
lib/lazy_graph/context.rb

Overview

Context class is responsible for managing ruleset and input data, allowing querying and dynamic method calls to access input fields.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(graph, input) ⇒ Context

Returns a new instance of Context.



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# File 'lib/lazy_graph/context.rb', line 9

def initialize(graph, input)
  input = HashUtils.deep_dup(input, symbolize: true)
  graph.validate!(input) if [true, 'input'].include?(graph.validate)
  @graph = graph
  @input = input
  @graph.root_node.properties.each_key do |key|
    define_singleton_method(key) { get(key) }
  end
end

Instance Attribute Details

#input ⇒ Object

Returns the value of attribute input.



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# File 'lib/lazy_graph/context.rb', line 7

def input
  @input
end

#ruleset ⇒ Object

Returns the value of attribute ruleset.



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# File 'lib/lazy_graph/context.rb', line 7

def ruleset
  @ruleset
end

Instance Method Details

#[](*parts) ⇒ Object 



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# File 'lib/lazy_graph/context.rb', line 83

def [](*parts)
  get(parts.map { |p| p.is_a?(Integer) ? "[#{p}]" : p.to_s }.join('.').gsub('.[', '['))
end

#debug(path) ⇒ Object 



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# File 'lib/lazy_graph/context.rb', line 30

def debug(path)
  result = resolve(path)
  raise result[:error] if result[:err]

  result[:debug_trace]
end

#get(path) ⇒ Object 



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# File 'lib/lazy_graph/context.rb', line 23

def get(path)
  result = resolve(path)
  raise result[:error] if result[:err]

  result[:output]
end

#get_json(path) ⇒ Object 



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# File 'lib/lazy_graph/context.rb', line 19

def get_json(path)
  HashUtils.strip_missing(get(path))
end

#pretty_print(q) ⇒ Object 



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# File 'lib/lazy_graph/context.rb', line 69

def pretty_print(q)
  # Start the custom pretty print
  q.group(1, '<LazyGraph::Context ', '>') do
    q.group do
      q.text 'graph='
      q.pp(@graph)
    end
    q.group do
      q.text 'input='
      q.pp(@input)
    end
  end
end

#resolve(path) ⇒ Object 



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# File 'lib/lazy_graph/context.rb', line 37

def resolve(path)
  @input = @graph.root_node.fetch_item({ input: @input }, :input, nil)

  query = PathParser.parse(path, strip_root: true)
  stack = StackPointer.new(nil, @input, 0, 0, :'$', nil)
  stack.root = stack

  result = @graph.root_node.resolve(query, stack)

  @graph.root_node.clear_visits!
  if @graph.debug?
    debug_trace = stack.frame[:DEBUG]
    stack.frame[:DEBUG] = nil
  end
  {
    output: result,
    debug_trace: debug_trace
  }
rescue AbortError, ValidationError => e
  {
    output: nil, err: e.message, status: :abort, error: e
  }
rescue StandardError => e
  if @graph.debug?
    LazyGraph.logger.error(e.message)
    LazyGraph.logger.error(e.backtrace.join("\n"))
  end
  {
    output: nil, err: e.message, backtrace: e.backtrace, error: e
  }
end