Module: Grammar

Defined in:
lib/emerald/grammar.rb

Overview

Interface which interacts with emerald context free grammar. Parses the preprocessed Emerald and prints out success if the parser was successful and failure if there was an error when parsing. Returns an abstract syntax tree.

Defined Under Namespace

Classes: ParserError, PreProcessorError

Class Method Summary collapse

Class Method Details

.parse_grammar(text, original, source_map) ⇒ Object

Parse the preprocessed emerald text and print failure if it fails the parsing stage



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# File 'lib/emerald/grammar.rb', line 69

def self.parse_grammar(text, original, source_map)
  parsed = @parser.parse(text)

  if parsed.nil?
    source_line = source_map[@parser.failure_line][:source_line]
    if source_line.nil?
      raise PreProcessorError.new(
        @parser.failure_line,
        @parser.failure_reason,
        text
      )
    end
    raise ParserError.new(
      source_line,
      @parser.failure_reason,
      original
    )
  end

  parsed
end