Class: Crisp::Parser

Inherits:

Object

• Object
• Crisp::Parser

Defined in:

lib/crisp/parser.rb

Overview

The Crisp parser

The parser uses treetop for defining the syntax (see crisp.treetop) For parsing crisp code (as string) call parse on a instance. The output of the parser can be evaluated by passing it to a Crisp runtime.

Instance Method Summary

• #initialize ⇒ Parser constructor

  create a new treetop parser.

• #parse(code) ⇒ Object

  parse the code and return an abstract syntax tree (ast).

Constructor Details

#initialize ⇒ Parser

create a new treetop parser

# File 'lib/crisp/parser.rb', line 11

def initialize
  @parser = CrispParser.new
end

Instance Method Details

#parse(code) ⇒ Object

parse the code and return an abstract syntax tree (ast)

Raises:

• (SyntaxError)

# File 'lib/crisp/parser.rb', line 16

def parse(code)
  ast = @parser.parse(code)

  raise SyntaxError, "syntax error at : #{@parser.index}" if !ast

  ast
end