Class: Philiprehberger::SafeExec::Parser

Inherits:

Object

• Object
• Philiprehberger::SafeExec::Parser

Defined in:

lib/philiprehberger/safe_exec/parser.rb

Overview

Recursive descent parser that builds an AST from tokens

Instance Method Summary

• #initialize(tokens) ⇒ Parser constructor

  A new instance of Parser.

• #parse ⇒ Hash

  Parse the token stream into an AST node.

Constructor Details

#initialize(tokens) ⇒ Parser

Returns a new instance of Parser.

# File 'lib/philiprehberger/safe_exec/parser.rb', line 7

def initialize(tokens)
  @tokens = tokens
  @pos = 0
end

Instance Method Details

#parse ⇒ Hash

Parse the token stream into an AST node

Returns:

• (Hash) —

  the AST node

Raises:

• (Philiprehberger::SafeExec::Error) —

  on parse errors

# File 'lib/philiprehberger/safe_exec/parser.rb', line 16

def parse
  node = parse_ternary
  raise Error, "unexpected token: #{current&.value}" if current

  node
end