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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) .
151 lines
4.8 KiB
EmacsLisp
151 lines
4.8 KiB
EmacsLisp
;; -*- lexical-binding: t; -*-
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(setq debug-on-error t)
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(require 'mal/types)
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(require 'mal/func)
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(require 'mal/env)
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(require 'mal/reader)
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(require 'mal/printer)
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(require 'mal/core)
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(defvar repl-env (mal-env))
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(dolist (binding core-ns)
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(let ((symbol (car binding))
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(fn (cdr binding)))
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(mal-env-set repl-env symbol fn)))
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(defun READ (input)
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(read-str input))
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(defun EVAL (ast env)
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(catch 'return
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(while t
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(let ((dbgeval (mal-env-get env 'DEBUG-EVAL)))
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(if (and dbgeval
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(not (member (mal-type dbgeval) '(false nil))))
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(println "EVAL: %s\n" (PRINT ast))))
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(cl-case (mal-type ast)
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(list
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(let* ((a (mal-value ast))
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(a1 (cadr a))
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(a2 (nth 2 a))
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(a3 (nth 3 a)))
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(unless a (throw 'return ast))
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(cl-case (mal-value (car a))
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(def!
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(let ((identifier (mal-value a1))
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(value (EVAL a2 env)))
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(throw 'return (mal-env-set env identifier value))))
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(let*
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(let ((env* (mal-env env))
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(bindings (mal-listify a1))
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(form a2))
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(while bindings
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(let ((key (mal-value (pop bindings)))
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(value (EVAL (pop bindings) env*)))
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(mal-env-set env* key value)))
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(setq env env*
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ast form))) ; TCO
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(do
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(let* ((a0... (cdr a))
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(butlast (butlast a0...))
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(last (car (last a0...))))
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(mapcar (lambda (item) (EVAL item env)) butlast)
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(setq ast last))) ; TCO
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(if
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(let* ((condition (EVAL a1 env))
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(condition-type (mal-type condition))
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(then a2)
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(else a3))
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(if (and (not (eq condition-type 'false))
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(not (eq condition-type 'nil)))
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(setq ast then) ; TCO
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(if else
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(setq ast else) ; TCO
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(throw 'return mal-nil)))))
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(fn*
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(let* ((binds (mapcar 'mal-value (mal-value a1)))
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(body a2)
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(fn (mal-fn
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(lambda (&rest args)
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(let ((env* (mal-env env binds args)))
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(EVAL body env*))))))
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(throw 'return (mal-func body binds env fn))))
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(t
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;; not a special form
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(let ((fn (EVAL (car a) env))
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(args (mapcar (lambda (x) (EVAL x env)) (cdr a))))
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(if (mal-func-p fn)
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(let ((env* (mal-env (mal-func-env fn)
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(mal-func-params fn)
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args)))
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(setq env env*
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ast (mal-func-ast fn))) ; TCO
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;; built-in function
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(let ((fn* (mal-value fn)))
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(throw 'return (apply fn* args)))))))))
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(symbol
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(let ((key (mal-value ast)))
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(throw 'return (or (mal-env-get env key)
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(error "'%s' not found" key)))))
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(vector
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(throw 'return
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(mal-vector (vconcat (mapcar (lambda (item) (EVAL item env))
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(mal-value ast))))))
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(map
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(let ((map (copy-hash-table (mal-value ast))))
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(maphash (lambda (key val)
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(puthash key (EVAL val env) map))
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map)
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(throw 'return (mal-map map))))
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(t
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;; return as is
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(throw 'return ast))))))
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(defun PRINT (input)
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(pr-str input t))
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(defun rep (input)
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(PRINT (EVAL (READ input) repl-env)))
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(rep "(def! not (fn* (a) (if a false true)))")
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(defun readln (prompt)
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;; C-d throws an error
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(ignore-errors (read-from-minibuffer prompt)))
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(defun println (format-string &rest args)
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(if (not args)
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(princ format-string)
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(princ (apply 'format format-string args)))
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(terpri))
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(defun main ()
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(let (eof)
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(while (not eof)
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(let ((input (readln "user> ")))
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(if input
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(condition-case err
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(println (rep input))
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(end-of-token-stream
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;; empty input, carry on
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)
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(unterminated-sequence
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(princ (format "Expected '%c', got EOF\n"
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(cl-case (cadr err)
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(string ?\")
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(list ?\))
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(vector ?\])
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(map ?})))))
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(error ; catch-all
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(println (error-message-string err))))
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(setq eof t)
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;; print final newline
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(terpri))))))
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(main)
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