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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) .
104 lines
1.9 KiB
PostScript
104 lines
1.9 KiB
PostScript
/runlibfile where { pop }{ /runlibfile { run } def } ifelse %
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(types.ps) runlibfile
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(reader.ps) runlibfile
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(printer.ps) runlibfile
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% read
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/_readline { print flush (%stdin) (r) file 1024 string readline } def
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/READ {
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/str exch def
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str read_str
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} def
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% eval
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/EVAL { 3 dict begin
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/env exch def
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/ast exch def
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%(eval_ast: ) print ast ==
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ast _symbol? { %if symbol
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env ast known {
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env ast get
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}{
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(') ast
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dup length string cvs
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(' not found)
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concatenate concatenate
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_throw
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} ifelse
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}{
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ast _vector? {
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[
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ast /data get { %forall items
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env EVAL
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} forall
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] _vector_from_array
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}{
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ast _hash_map? {
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<<
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ast /data get { %forall entries
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env EVAL
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} forall
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>> _hash_map_from_dict
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}{
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ast _list? not {
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ast
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}{
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ast _count 0 eq {
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ast
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}{
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/a0 ast 0 _nth def
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a0 env EVAL
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[ ast _rest /data get { env EVAL } forall ] _list_from_array exch
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exec % apply function to args
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} ifelse } ifelse } ifelse } ifelse } ifelse
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end } def
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% print
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/PRINT {
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true _pr_str
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} def
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% repl
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/repl_env <<
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(+) { dup 0 _nth exch 1 _nth add }
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(-) { dup 0 _nth exch 1 _nth sub }
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(*) { dup 0 _nth exch 1 _nth mul }
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(/) { dup 0 _nth exch 1 _nth idiv }
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>> def
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/REP { READ repl_env EVAL PRINT } def
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% repl loop
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{ %loop
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(user> ) _readline
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not { exit } if % exit if EOF
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{ %try
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REP print (\n) print
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} stopped {
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(Error: ) print
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get_error_data false _pr_str print (\n) print
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$error /newerror false put
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$error /errorinfo null put
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clear
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cleardictstack
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} if
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} bind loop
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(\n) print % final newline before exit for cleanliness
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quit
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