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#!/usr/bin/env ruby -w
require_relative "lox/ast_printer"
require_relative "lox/error"
require_relative "lox/expr"
require_relative "lox/interpreter"
require_relative "lox/parser"
require_relative "lox/scanner"
require_relative "lox/token"
module Lox
class Runner
def initialize(scanner: Scanner.new, interpreter: Interpreter.new)
@scanner, @interpreter = scanner, interpreter
end
def run(src) = interpret(parse(scan(src)))
def scan(src) = @scanner.scan(src)
def parse(tokens) = Parser.new(tokens).parse!
def resolve(stmts) = Resolver.new(@interpreter).resolve(*stmts)
def interpret(stmts) = @interpreter.interpret(stmts)
end
class FileRunner < Runner
def run(src)
super
rescue Lox::ParseError => e
STDERR.puts e.message
exit 65
rescue Lox::RuntimeError => e
STDERR.puts e.message, "[line #{e.token.line}]"
exit 70
end
end
class PromptRunner < Runner
def initialize
super(interpreter: Interpreter.new(Environment.new))
end
def run(src)
super
rescue Lox::ParseError, Lox::RuntimeError => e
STDERR.puts e.message
end
def parse(tokens)
stmts = Parser.new(tokens).parse!
if stmts.last.instance_of?(Stmt::Expr)
stmts << Stmt::Print.new(stmts.pop.expr)
end
stmts
end
end
end