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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}"
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 ;;
*) EVAL_AST "${ast}" "${env}"
[[ "${__ERROR}" ]] && r= && return 1
local el="${r}"
first "${el}"; local f="${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: read, eval, print, loop
ENV; REPL_ENV="${r}"
REP () {
r=
READ_STR "${1}"
EVAL "${r}" ${REPL_ENV}
PRINT "${r}"
}
_ref () { ENV_SET "${REPL_ENV}" "${1}" "${2}"; }
_ref "+" num_plus
_ref "-" num_minus
_ref "__STAR__" num_multiply
_ref "/" num_divide
if [[ -n "${INTERACTIVE}" ]]; then
while true; do
READLINE "user> " || exit "$?"
[[ "${r}" ]] && REP "${r}" && echo "${r}"
done
fi
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