mirror of
https://github.com/kanaka/mal.git
synced 2024-09-20 01:57:09 +03:00
98 lines
2.3 KiB
Bash
Executable File
98 lines
2.3 KiB
Bash
Executable File
#!/usr/bin/env bash
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source $(dirname $0)/reader.sh
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source $(dirname $0)/printer.sh
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# read
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READ () {
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[ "${1}" ] && r="${1}" || READLINE
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READ_STR "${r}"
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}
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# eval
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EVAL_AST () {
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local ast="${1}" env="${2}"
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#_pr_str "${ast}"; echo "EVAL_AST '${ast}:${r} / ${env}'"
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_obj_type "${ast}"; local ot="${r}"
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case "${ot}" in
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symbol)
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local val="${ANON["${ast}"]}"
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eval r="\${${env}["${val}"]}"
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[ "${r}" ] || _error "'${val}' not found" ;;
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list)
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_map_with_type _list EVAL "${ast}" "${env}" ;;
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vector)
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_map_with_type _vector EVAL "${ast}" "${env}" ;;
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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="${new_hm}" ;;
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*)
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r="${ast}" ;;
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esac
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}
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EVAL () {
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local ast="${1}" env="${2}"
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r=
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[[ "${__ERROR}" ]] && return 1
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#_pr_str "${ast}"; echo "EVAL '${r} / ${env}'"
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_obj_type "${ast}"; local ot="${r}"
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if [[ "${ot}" != "list" ]]; then
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EVAL_AST "${ast}" "${env}"
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return
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fi
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_empty? "${ast}" && r="${ast}" && return
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# apply list
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EVAL_AST "${ast}" "${env}"
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[[ "${__ERROR}" ]] && return 1
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local el="${r}"
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_first "${el}"; local f="${r}"
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_rest "${el}"; local args="${ANON["${r}"]}"
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#echo "invoke: ${f} ${args}"
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eval ${f} ${args}
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}
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# print
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PRINT () {
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if [[ "${__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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declare -A REPL_ENV
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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 "${r}"
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}
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plus () { r=$(( ${ANON["${1}"]} + ${ANON["${2}"]} )); _number "${r}"; }
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minus () { r=$(( ${ANON["${1}"]} - ${ANON["${2}"]} )); _number "${r}"; }
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multiply () { r=$(( ${ANON["${1}"]} * ${ANON["${2}"]} )); _number "${r}"; }
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divide () { r=$(( ${ANON["${1}"]} / ${ANON["${2}"]} )); _number "${r}"; }
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REPL_ENV["+"]=plus
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REPL_ENV["-"]=minus
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REPL_ENV["__STAR__"]=multiply
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REPL_ENV["/"]=divide
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# repl loop
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while true; do
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READLINE "user> " || exit "$?"
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[[ "${r}" ]] && REP "${r}" && echo "${r}"
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done
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