Class: Vangrail::Colang::ValueParser

Inherits:
Object
  • Object
show all
Defined in:
lib/vangrail/colang/value_parser.rb

Overview

One grammar for assign RHS, if conditions, and action arguments.

Strings are tokenized before == / != is considered, so "a == b" == $x is a compare of a literal against a variable.

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(text, line, error) ⇒ ValueParser

Returns a new instance of ValueParser.



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# File 'lib/vangrail/colang/value_parser.rb', line 16

def initialize(text, line, error)
  @text = text
  @line = line
  @error = error
end

Class Method Details

.parse(text, line, error) ⇒ Object 



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# File 'lib/vangrail/colang/value_parser.rb', line 12

def self.parse(text, line, error)
  new(text, line, error).parse
end

Instance Method Details

#parse ⇒ Object 



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# File 'lib/vangrail/colang/value_parser.rb', line 22

def parse
  tokens = tokenize
  node, index = parse_value(tokens, 0)
  raise fail_value(@text) unless tokens[index][0] == :eof

  node
end