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#!/bin/bash
INTERACTIVE=${INTERACTIVE-yes}
source $(dirname $0)/reader.sh
# READ: read and parse input
READ () {
READLINE
READ_STR "${r}"
}
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)
local val="${ANON["${ast}"]}"
ENV_GET "${env}" "${val}"
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: evaluate the parameter
EVAL () {
local ast="${1}" env="${2}"
while true; do
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!) local k="${ANON["${a1}"]}"
#echo "def! ${k} to ${a2} in ${env}"
EVAL "${a2}" "${env}"
ENV_SET "${env}" "${k}" "${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 "${let_env}" "${ANON["${let_pairs[${idx}]}"]}" "${r}"
idx=$(( idx + 2))
done
EVAL "${a2}" "${let_env}"
return ;;
do) _count "${ast}"
_slice "${ast}" 1 $(( ${r} - 2 ))
EVAL_AST "${r}" "${env}"
[[ "${__ERROR}" ]] && r= && return 1
last "${ast}"
ast="${r}"
# Continue loop
;;
if) EVAL "${a1}" "${env}"
if [[ "${r}" == "${__false}" || "${r}" == "${__nil}" ]]; then
# eval false form
_nth "${ast}" 3; local a3="${r}"
if [[ "${a3}" ]]; then
ast="${a3}"
else
r="${__nil}"
return
fi
else
# eval true condition
ast="${a2}"
fi
# Continue loop
;;
fn*) new_function "ENV \"${env}\" \"${a1}\" \"\${@}\"; \
EVAL \"${a2}\" \"\${r}\"" \
"${a2}" "${env}" "${a1}"
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}] ${args}"
if [[ "${f//@/ }" != "${f}" ]]; then
set -- ${f//@/ }
ast="${2}"
ENV "${3}" "${4}" ${args}
env="${r}"
else
eval ${f%%@*} ${args}
return
fi
# Continue loop
;;
esac
done
}
# PRINT:
PRINT () {
if [[ "${__ERROR}" ]]; then
_pr_str "${__ERROR}" yes
r="Error: ${r}"
__ERROR=
else
_pr_str "${1}" yes
fi
}
# REPL: read, eval, print, loop
ENV; REPL_ENV="${r}"
REP () {
r=
READ_STR "${1}"
EVAL "${r}" ${REPL_ENV}
PRINT "${r}"
}
_fref () { new_function "${2} \"\${@}\""; ENV_SET "${REPL_ENV}" "${1}" "${r}"; }
# Import types functions
for n in "${!types_ns[@]}"; do _fref "${n}" "${types_ns["${n}"]}"; done
read_string () { READ_STR "${ANON["${1}"]}"; }
_fref "read-string" read_string
_eval () { EVAL "${1}" "${REPL_ENV}"; }
_fref "eval" _eval
slurp () { string "$(cat "${ANON["${1}"]}")"; }
_fref "slurp" slurp
slurp_do () { string "(do $(cat "${ANON["${1}"]}"))"; }
_fref "slurp-do" slurp_do
# Defined using the language itself
REP "(def! not (fn* (a) (if a false true)))"
REP "(def! load-file (fn* (f) (eval (read-string (slurp-do f)))))"
if [[ "${1}" ]]; then
echo "${@}"
REP "(load-file \"${1}\")" && echo "${r}"
elif [[ -n "${INTERACTIVE}" ]]; then
while true; do
READLINE "user> " || exit "$?"
[[ "${r}" ]] && REP "${r}" && echo "${r}"
done
fi
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