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033892777a
See issue #587. * Merge eval-ast and eval into a single conditional. * Expand macros during the apply phase, removing lots of duplicate tests, and increasing the overall consistency by allowing the macro to be computed instead of referenced by name (`((defmacro! cond (...)))` is currently illegal for example). * Print "EVAL: $ast" at the top of EVAL if DEBUG-EVAL exists in the MAL environment. * Remove macroexpand and quasiquoteexpand special forms. * Use pattern-matching style in process/step*.txt. Unresolved issues: c.2: unable to reproduce with gcc 11.12.0. elm: the directory is unchanged. groovy: sometimes fail, but not on each rebuild. nasm: fails some new soft tests, but the issue is unreproducible when running the interpreter manually. objpascal: unreproducible with fpc 3.2.2. ocaml: unreproducible with 4.11.1. perl6: unreproducible with rakudo 2021.09. Unrelated changes: Reduce diff betweens steps. Prevent defmacro! from mutating functions: c forth logo miniMAL vb. dart: fix recent errors and warnings ocaml: remove metadata from symbols. Improve the logo implementation. Encapsulate all representation in types.lg and env.lg, unwrap numbers. Replace some manual iterations with logo control structures. Reduce the diff between steps. Use native iteration in env_get and env_map Rewrite the reader with less temporary strings. Reduce the number of temporary lists (for example, reverse iteration with butlast requires O(n^2) allocations). It seems possible to remove a few exceptions: GC settings (Dockerfile), NO_SELF_HOSTING (IMPLS.yml) and step5_EXCLUDES (Makefile.impls) .
122 lines
3.0 KiB
Ruby
122 lines
3.0 KiB
Ruby
require "readline"
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require_relative "env"
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require_relative "errors"
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require_relative "printer"
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require_relative "reader"
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module Mal
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extend self
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@repl_env = Env.new
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@repl_env.set(Types::Symbol.for('+'), -> (a, b) { a + b })
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@repl_env.set(Types::Symbol.for('-'), -> (a, b) { a - b })
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@repl_env.set(Types::Symbol.for('*'), -> (a, b) { a * b })
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@repl_env.set(Types::Symbol.for('/'), -> (a, b) { a / b })
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def READ(input)
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read_str(input)
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end
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def EVAL(ast, environment)
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case environment.get(Types::Symbol.for("DEBUG-EVAL"))
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when 0, Types::Nil, Types::False
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else
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puts "EVAL: #{pr_str(ast, true)}"
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end
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case ast
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when Types::Symbol
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value = environment.get(ast)
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if value == 0
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raise SymbolNotFoundError, "'#{ast.value}' not found"
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end
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return value
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when Types::Vector
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vec = Types::Vector.new
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ast.each { |i| vec << EVAL(i, environment) }
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return vec
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when Types::Hashmap
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hashmap = Types::Hashmap.new
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ast.each { |k, v| hashmap[k] = EVAL(v, environment) }
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return hashmap
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when Types::List
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if ast.size == 0
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return ast
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end
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case ast.first
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when Types::Symbol.for("def!")
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_, sym, val = ast
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environment.set(sym, EVAL(val, environment))
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when Types::Symbol.for("let*")
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e = Env.new(environment)
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_, bindings, val = ast
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unless Types::List === bindings || Types::Vector === bindings
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raise InvalidLetBindingsError
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end
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until bindings.empty?
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k, v = bindings.shift(2)
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raise InvalidLetBindingsError if k.nil?
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v = Types::Nil.instance if v.nil?
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e.set(k, EVAL(v, e))
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end
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if !val.nil?
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EVAL(val, e)
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else
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Types::Nil.instance
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end
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else
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evaluated = Types::List.new
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ast.each { |i| evaluated << EVAL(i, environment) }
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maybe_callable = evaluated.first
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if maybe_callable.respond_to?(:call)
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maybe_callable.call(*evaluated[1..])
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else
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raise NotCallableError, "Error! #{PRINT(maybe_callable)} is not callable."
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end
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end
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else
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return ast
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end
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end
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def PRINT(input)
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pr_str(input, true)
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end
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def rep(input)
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PRINT(EVAL(READ(input), @repl_env))
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rescue InvalidHashmapKeyError => e
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"Error! Hashmap keys can only be strings or keywords."
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rescue NotCallableError => e
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e.message
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rescue SymbolNotFoundError => e
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e.message
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rescue UnbalancedEscapingError => e
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"Error! Detected unbalanced escaping. Check for matching '\\'."
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rescue UnbalancedHashmapError => e
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"Error! Detected unbalanced list. Check for matching '}'."
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rescue UnbalancedListError => e
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"Error! Detected unbalanced list. Check for matching ')'."
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rescue UnbalancedStringError => e
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"Error! Detected unbalanced string. Check for matching '\"'."
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rescue UnbalancedVectorError => e
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"Error! Detected unbalanced list. Check for matching ']'."
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end
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end
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while input = Readline.readline("user> ")
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puts Mal.rep(input)
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end
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puts
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