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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) .
280 lines
7.9 KiB
Bash
Executable File
280 lines
7.9 KiB
Bash
Executable File
#!/usr/bin/env bash
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source $(dirname $0)/reader.sh
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source $(dirname $0)/printer.sh
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source $(dirname $0)/env.sh
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source $(dirname $0)/core.sh
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# read
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READ () {
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[ "${1}" ] && r="${1}" || READLINE
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READ_STR "${r}"
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}
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# eval
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starts_with () {
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_list? "$1" && _first "$1" && _symbol? "$r" && [ "${ANON[$r]}" = "$2" ]
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}
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QUASIQUOTE () {
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_obj_type "$1"
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case "$r" in
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list)
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if starts_with "$1" unquote; then
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_nth "$1" 1
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else
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qqIter "$1"
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fi ;;
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vector)
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_symbol vec; local a="$r"
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qqIter "$1"
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_list "$a" "$r" ;;
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symbol|hash_map)
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_symbol quote
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_list "$r" "$1" ;;
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*)
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r="$1" ;;
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esac
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}
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qqIter () {
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if _empty? "$1"; then
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_list
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else
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_nth "${1}" 0; local a0="$r"
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if starts_with "$a0" splice-unquote; then
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_symbol concat; local a="$r"
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_nth "$a0" 1; local b="$r"
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else
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_symbol cons; local a="$r"
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QUASIQUOTE "$a0"; local b="$r"
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fi
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_rest "$1"
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qqIter "$r"
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_list "$a" "$b" "$r"
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fi
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}
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_symbol DEBUG-EVAL; debug_eval="$r"
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EVAL () {
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local ast="${1}" env="${2}"
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while true; do
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r=
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ENV_GET "$env" "$debug_eval"
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if [ -n "$__ERROR" ]; then
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__ERROR=
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elif [ "$r" != "$__false" -a "$r" != "$__nil" ]; then
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_pr_str "$ast" yes; echo "EVAL: $r / $env"
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fi
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_obj_type "${ast}"; local ot="${r}"
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case "${ot}" in
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symbol)
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ENV_GET "${env}" "${ast}"
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return ;;
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list)
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;;
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vector)
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_map_with_type _vector EVAL "${ast}" "${env}"
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return ;;
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hash_map)
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local res="" key= val="" hm="${ANON["${ast}"]}"
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_hash_map; local new_hm="${r}"
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eval local keys="\${!${hm}[@]}"
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for key in ${keys}; do
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eval val="\${${hm}[\"${key}\"]}"
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EVAL "${val}" "${env}"
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_assoc! "${new_hm}" "${key}" "${r}"
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done
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r="${new_hm}"
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return ;;
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*)
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r="${ast}"
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return ;;
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esac
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# apply list
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_empty? "${ast}" && r="${ast}" && return
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_nth "${ast}" 0; local a0="${r}"
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_nth "${ast}" 1; local a1="${r}"
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_nth "${ast}" 2; local a2="${r}"
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case "${ANON["${a0}"]}" in
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def!) EVAL "${a2}" "${env}"
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[[ "${__ERROR}" ]] && return 1
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ENV_SET "${env}" "${a1}" "${r}"
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return ;;
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let__STAR__) ENV "${env}"; local let_env="${r}"
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local let_pairs=(${ANON["${a1}"]})
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local idx=0
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#echo "let: [${let_pairs[*]}] for ${a2}"
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while [[ "${let_pairs["${idx}"]}" ]]; do
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EVAL "${let_pairs[$(( idx + 1))]}" "${let_env}"
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ENV_SET "${let_env}" "${let_pairs[${idx}]}" "${r}"
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idx=$(( idx + 2))
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done
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ast="${a2}"
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env="${let_env}"
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# Continue loop
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;;
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quote)
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r="${a1}"
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return ;;
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quasiquote)
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QUASIQUOTE "${a1}"
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ast="${r}"
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# Continue loop
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;;
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defmacro!)
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EVAL "${a2}" "${env}"
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[[ "${__ERROR}" ]] && return 1
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local func="${r}"
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__new_obj_like "${func}"
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ANON["${r}"]="${ANON["${func}"]}"
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ANON["${r}_ismacro_"]="yes"
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ENV_SET "${env}" "${a1}" "${r}"
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return ;;
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sh__STAR__) EVAL "${a1}" "${env}"
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local output=""
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local line=""
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r="${ANON["${r}"]}"
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r="${r//__STAR__/*}"
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while read -r line || [ -n "${line}" ]; do
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output="${output}${line}"$'\n'
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done < <(eval "${r}")
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_string "${output%$'\n'}"
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return ;;
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try__STAR__) EVAL "${a1}" "${env}"
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[[ -z "${__ERROR}" ]] && return
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_nth "${a2}" 0; local a20="${r}"
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if [ "${ANON["${a20}"]}" == "catch__STAR__" ]; then
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_nth "${a2}" 1; local a21="${r}"
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_nth "${a2}" 2; local a22="${r}"
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_list "${a21}"; local binds="${r}"
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ENV "${env}" "${binds}" "${__ERROR}"
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local try_env="${r}"
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__ERROR=
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EVAL "${a22}" "${try_env}"
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fi # if no catch* clause, just propagate __ERROR
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return ;;
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do) _count "${ast}"
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_slice "${ast}" 1 $(( ${r} - 2 ))
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_map_with_type _list EVAL "${r}" "${env}"
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[[ "${__ERROR}" ]] && r= && return 1
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_last "${ast}"
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ast="${r}"
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# Continue loop
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;;
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if) EVAL "${a1}" "${env}"
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[[ "${__ERROR}" ]] && return 1
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if [[ "${r}" == "${__false}" || "${r}" == "${__nil}" ]]; then
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# eval false form
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_nth "${ast}" 3; local a3="${r}"
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if [[ "${a3}" ]]; then
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ast="${a3}"
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else
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r="${__nil}"
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return
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fi
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else
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# eval true condition
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ast="${a2}"
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fi
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# Continue loop
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;;
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fn__STAR__) _function "ENV \"${env}\" \"${a1}\" \"\${@}\"; \
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EVAL \"${a2}\" \"\${r}\"" \
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"${a2}" "${env}" "${a1}"
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return ;;
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*) EVAL "${a0}" "${env}"
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[[ "${__ERROR}" ]] && return 1
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local f="${r}"
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_rest "${ast}"
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# Should cause no error as ast is not empty.
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local args="${r}"
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if [ "${ANON["${f}_ismacro_"]}" ]; then
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f="${ANON["${f}"]}"
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${f%%@*} ${ANON["${args}"]}
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ast="${r}"
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continue
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fi
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f="${ANON["${f}"]}"
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_map_with_type _list EVAL "${args}" "${env}"
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[[ "${__ERROR}" ]] && r= && return 1
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args="${ANON["${r}"]}"
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#echo "invoke: [${f}] ${args}"
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if [[ "${f//@/ }" != "${f}" ]]; then
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set -- ${f//@/ }
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ast="${2}"
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ENV "${3}" "${4}" ${args}
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env="${r}"
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else
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eval ${f%%@*} ${args}
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return
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fi
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# Continue loop
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;;
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esac
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done
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}
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# print
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PRINT () {
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if [[ "${__ERROR}" ]]; then
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_pr_str "${__ERROR}" yes
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r="Error: ${r}"
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__ERROR=
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else
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_pr_str "${1}" yes
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fi
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}
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# repl
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ENV; REPL_ENV="${r}"
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REP () {
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r=
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READ "${1}"
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EVAL "${r}" "${REPL_ENV}"
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PRINT "${r}"
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}
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# core.sh: defined using bash
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_fref () {
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_symbol "${1}"; local sym="${r}"
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_function "${2} \"\${@}\""
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ENV_SET "${REPL_ENV}" "${sym}" "${r}"
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}
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for n in "${!core_ns[@]}"; do _fref "${n}" "${core_ns["${n}"]}"; done
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_eval () { EVAL "${1}" "${REPL_ENV}"; }
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_fref "eval" _eval
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_list; argv="${r}"
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for _arg in "${@:2}"; do _string "${_arg}"; _conj! "${argv}" "${r}"; done
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_symbol "__STAR__ARGV__STAR__"
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ENV_SET "${REPL_ENV}" "${r}" "${argv}";
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# core.mal: defined using the language itself
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REP "(def! *host-language* \"bash\")"
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REP "(def! not (fn* (a) (if a false true)))"
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REP "(def! load-file (fn* (f) (eval (read-string (str \"(do \" (slurp f) \"\nnil)\")))))"
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REP "(defmacro! cond (fn* (& xs) (if (> (count xs) 0) (list 'if (first xs) (if (> (count xs) 1) (nth xs 1) (throw \"odd number of forms to cond\")) (cons 'cond (rest (rest xs)))))))"
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# load/run file from command line (then exit)
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if [[ "${1}" ]]; then
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REP "(load-file \"${1}\")"
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exit 0
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fi
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# repl loop
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REP "(println (str \"Mal [\" *host-language* \"]\"))"
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while true; do
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READLINE "user> " || exit "$?"
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[[ "${r}" ]] && REP "${r}" && echo "${r}"
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done
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