Class: Rattler::Parsers::Apply

Inherits:
Parser show all
Defined in:
lib/rattler/parsers/apply.rb

Overview

Apply parses by applying a referenced parse rule.

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Parser

#&, #>>, #capturing?, #labeled?, #list, #one_or_more, #optional, #repeat, #semantic?, #sequence?, #skip, #variable_capture_count?, #with_ws, #zero_or_more, #|

Methods included from Runtime::ParserHelper

#select_captures

Methods inherited from Util::Node

#==, #[], #attrs, #can_equal?, #child, #children, #each, #empty?, #eql?, #initialize, #inspect, #method_missing, #name, #pretty_print, #pretty_print_cycle, #respond_to?, #same_contents?, #to_graphviz, #with_attrs, #with_attrs!, #with_children

Constructor Details

This class inherits a constructor from Rattler::Util::Node

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class Rattler::Util::Node

Class Method Details

.[](rule_name) ⇒ Apply

Returns a new parser that parses by applying the rule referenced by rule_name.

Parameters:

  • rule_name (Symbol, String) —

    the name of the referenced rule

Returns:

  • (Apply) —

    a new parser that parses by applying the rule referenced by rule_name



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# File 'lib/rattler/parsers/apply.rb', line 11

def self.[](rule_name)
  self.new(:rule_name => rule_name.to_sym)
end

.parsed(results) ⇒ Object 



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# File 'lib/rattler/parsers/apply.rb', line 16

def self.parsed(results) #:nodoc:
  self[results.first]
end

Instance Method Details

#capturing_decidable? ⇒ Object

true if it can be determined statically whether the parser returns parse results on success

Returns:

  • true if it can be determined statically whether the parser returns parse results on success



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# File 'lib/rattler/parsers/apply.rb', line 30

def capturing_decidable?
  false
end

#parse(scanner, rules, scope = ParserScope.empty) ⇒ Object

Apply the parse rule referenced by the #rule_name.

Parameters:

  • scanner (StringScanner) —

    the scanner for the current parse

  • rules (RuleSet) —

    the grammar rules being used for the current parse

  • scope (ParserScope) (defaults to: ParserScope.empty) —

    the scope of captured results

Returns:

  • the result of applying the referenced parse rule



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# File 'lib/rattler/parsers/apply.rb', line 25

def parse(scanner, rules, scope = ParserScope.empty)
  (rule = rules[rule_name]) && rule.parse(scanner, rules, scope)
end