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ea81a8087b
- types: low-level mapping to the implementation language. - core: functions on types that are exposed directly to mal. - printer: implementation called by pr-str, str, prn, println. - env: the environment implementation - Also, unindent all TCO while loops so that the diff of step4 and step5 are minimized.
95 lines
2.1 KiB
Bash
Executable File
95 lines
2.1 KiB
Bash
Executable File
#!/bin/bash
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INTERACTIVE=${INTERACTIVE-yes}
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source $(dirname $0)/reader.sh
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source $(dirname $0)/printer.sh
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source $(dirname $0)/core.sh
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# READ: read and parse input
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READ () {
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READLINE
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READ_STR "${r}"
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}
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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="" 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: evaluate the parameter
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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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# 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: read, eval, print, loop
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declare -A REPL_ENV
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REP () {
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READ_STR "${1}"
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EVAL "${r}" REPL_ENV
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PRINT "${r}"
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}
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REPL_ENV["+"]=num_plus
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REPL_ENV["-"]=num_minus
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REPL_ENV["__STAR__"]=num_multiply
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REPL_ENV["/"]=num_divide
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if [[ -n "${INTERACTIVE}" ]]; then
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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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fi
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