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#!/usr/bin/env bash
source $(dirname $0)/reader.sh
source $(dirname $0)/printer.sh
source $(dirname $0)/env.sh
source $(dirname $0)/core.sh
# read
READ () {
[ "${1}" ] && r="${1}" || READLINE
READ_STR "${r}"
}
# eval
EVAL_AST () {
local ast="${1}" env="${2}"
#_pr_str "${ast}"; echo "EVAL_AST '${ast}:${r} / ${env}'"
_obj_type "${ast}"; local ot="${r}"
case "${ot}" in
symbol)
ENV_GET "${env}" "${ast}"
return ;;
list)
_map_with_type _list EVAL "${ast}" "${env}" ;;
vector)
_map_with_type _vector EVAL "${ast}" "${env}" ;;
hash_map)
local res="" val="" hm="${ANON["${ast}"]}"
_hash_map; local new_hm="${r}"
eval local keys="\${!${hm}[@]}"
for key in ${keys}; do
eval val="\${${hm}[\"${key}\"]}"
EVAL "${val}" "${env}"
_assoc! "${new_hm}" "${key}" "${r}"
done
r="${new_hm}" ;;
*)
r="${ast}" ;;
esac
}
EVAL () {
local ast="${1}" env="${2}"
r=
[[ "${__ERROR}" ]] && return 1
#_pr_str "${ast}"; echo "EVAL '${r} / ${env}'"
_obj_type "${ast}"; local ot="${r}"
if [[ "${ot}" != "list" ]]; then
EVAL_AST "${ast}" "${env}"
return
fi
# apply list
_nth "${ast}" 0; local a0="${r}"
_nth "${ast}" 1; local a1="${r}"
_nth "${ast}" 2; local a2="${r}"
case "${ANON["${a0}"]}" in
def!) EVAL "${a2}" "${env}"
[[ "${__ERROR}" ]] && return 1
ENV_SET "${env}" "${a1}" "${r}"
return ;;
let*) ENV "${env}"; local let_env="${r}"
local let_pairs=(${ANON["${a1}"]})
local idx=0
#echo "let: [${let_pairs[*]}] for ${a2}"
while [[ "${let_pairs["${idx}"]}" ]]; do
EVAL "${let_pairs[$(( idx + 1))]}" "${let_env}"
ENV_SET "${let_env}" "${let_pairs[${idx}]}" "${r}"
idx=$(( idx + 2))
done
EVAL "${a2}" "${let_env}"
return ;;
do) _rest "${ast}"
EVAL_AST "${r}" "${env}"
[[ "${__ERROR}" ]] && r= && return 1
_last "${r}"
return ;;
if) EVAL "${a1}" "${env}"
[[ "${__ERROR}" ]] && return 1
if [[ "${r}" == "${__false}" || "${r}" == "${__nil}" ]]; then
# eval false form
_nth "${ast}" 3; local a3="${r}"
if [[ "${a3}" ]]; then
EVAL "${a3}" "${env}"
else
r="${__nil}"
fi
else
# eval true condition
EVAL "${a2}" "${env}"
fi
return ;;
fn*) _function "ENV \"${env}\" \"${a1}\" \"\${@}\"; \
EVAL \"${a2}\" \"\${r}\""
return ;;
*) EVAL_AST "${ast}" "${env}"
[[ "${__ERROR}" ]] && r= && return 1
local el="${r}"
_first "${el}"; local f="${ANON["${r}"]}"
_rest "${el}"; local args="${ANON["${r}"]}"
#echo "invoke: ${f} ${args}"
eval ${f} ${args}
return ;;
esac
}
# print
PRINT () {
if [[ "${__ERROR}" ]]; then
_pr_str "${__ERROR}" yes
r="Error: ${r}"
__ERROR=
else
_pr_str "${1}" yes
fi
}
# repl
ENV; REPL_ENV="${r}"
REP () {
r=
READ "${1}"
EVAL "${r}" "${REPL_ENV}"
PRINT "${r}"
}
# core.sh: defined using bash
_fref () {
_symbol "${1}"; local sym="${r}"
_function "${2} \"\${@}\""
ENV_SET "${REPL_ENV}" "${sym}" "${r}"
}
for n in "${!core_ns[@]}"; do _fref "${n}" "${core_ns["${n}"]}"; done
# core.mal: defined using the language itself
REP "(def! not (fn* (a) (if a false true)))"
# repl loop
while true; do
READLINE "user> " || exit "$?"
[[ "${r}" ]] && REP "${r}" && echo "${r}"
done
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