Commit | Line | Data |
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31690700 JM |
1 | #!/bin/bash |
2 | ||
31690700 | 3 | source $(dirname $0)/reader.sh |
ea81a808 | 4 | source $(dirname $0)/printer.sh |
ea81a808 | 5 | source $(dirname $0)/env.sh |
8cb5cda4 | 6 | source $(dirname $0)/core.sh |
31690700 | 7 | |
86b689f3 | 8 | # read |
31690700 | 9 | READ () { |
8cb5cda4 | 10 | [ "${1}" ] && r="${1}" || READLINE |
31690700 JM |
11 | READ_STR "${r}" |
12 | } | |
13 | ||
86b689f3 | 14 | # eval |
31690700 | 15 | IS_PAIR () { |
db4c329a | 16 | if _sequential? "${1}"; then |
31690700 JM |
17 | _count "${1}" |
18 | [[ "${r}" > 0 ]] && return 0 | |
19 | fi | |
20 | return 1 | |
21 | } | |
22 | ||
23 | QUASIQUOTE () { | |
24 | if ! IS_PAIR "${1}"; then | |
ea81a808 JM |
25 | _symbol quote |
26 | _list "${r}" "${1}" | |
31690700 JM |
27 | return |
28 | else | |
29 | _nth "${1}" 0; local a0="${r}" | |
30 | if [[ "${ANON["${a0}"]}" == "unquote" ]]; then | |
31 | _nth "${1}" 1 | |
32 | return | |
33 | elif IS_PAIR "${a0}"; then | |
34 | _nth "${a0}" 0; local a00="${r}" | |
35 | if [[ "${ANON["${a00}"]}" == "splice-unquote" ]]; then | |
ea81a808 | 36 | _symbol concat; local a="${r}" |
31690700 | 37 | _nth "${a0}" 1; local b="${r}" |
8cb5cda4 | 38 | _rest "${1}" |
31690700 | 39 | QUASIQUOTE "${r}"; local c="${r}" |
ea81a808 | 40 | _list "${a}" "${b}" "${c}" |
31690700 JM |
41 | return |
42 | fi | |
43 | fi | |
44 | fi | |
ea81a808 | 45 | _symbol cons; local a="${r}" |
31690700 | 46 | QUASIQUOTE "${a0}"; local b="${r}" |
8cb5cda4 | 47 | _rest "${1}" |
31690700 | 48 | QUASIQUOTE "${r}"; local c="${r}" |
ea81a808 | 49 | _list "${a}" "${b}" "${c}" |
31690700 JM |
50 | return |
51 | } | |
52 | ||
53 | IS_MACRO_CALL () { | |
54 | if ! _list? "${1}"; then return 1; fi | |
55 | _nth "${1}" 0; local a0="${r}" | |
56 | if _symbol? "${a0}"; then | |
57 | ENV_FIND "${2}" "${ANON["${a0}"]}_ismacro_" | |
58 | if [[ "${r}" ]]; then | |
59 | return 0 | |
60 | fi | |
61 | fi | |
62 | return 1 | |
63 | } | |
64 | ||
65 | MACROEXPAND () { | |
66 | local ast="${1}" env="${2}" | |
67 | while IS_MACRO_CALL "${ast}" "${env}"; do | |
68 | _nth "${ast}" 0; local a0="${r}" | |
69 | ENV_GET "${env}" "${ANON["${a0}"]}"; local mac="${ANON["${r}"]}" | |
8cb5cda4 | 70 | _rest "${ast}" |
31690700 JM |
71 | ${mac%%@*} ${ANON["${r}"]} |
72 | ast="${r}" | |
73 | done | |
74 | r="${ast}" | |
75 | } | |
76 | ||
77 | ||
78 | EVAL_AST () { | |
79 | local ast="${1}" env="${2}" | |
80 | #_pr_str "${ast}"; echo "EVAL_AST '${ast}:${r} / ${env}'" | |
81 | _obj_type "${ast}"; local ot="${r}" | |
82 | case "${ot}" in | |
83 | symbol) | |
84 | local val="${ANON["${ast}"]}" | |
85 | ENV_GET "${env}" "${val}" | |
86 | return ;; | |
87 | list) | |
ea81a808 | 88 | _map_with_type _list EVAL "${ast}" "${env}" ;; |
31690700 | 89 | vector) |
ea81a808 | 90 | _map_with_type _vector EVAL "${ast}" "${env}" ;; |
31690700 JM |
91 | hash_map) |
92 | local res="" val="" hm="${ANON["${ast}"]}" | |
ea81a808 | 93 | _hash_map; local new_hm="${r}" |
31690700 JM |
94 | eval local keys="\${!${hm}[@]}" |
95 | for key in ${keys}; do | |
96 | eval val="\${${hm}[\"${key}\"]}" | |
97 | EVAL "${val}" "${env}" | |
ea81a808 | 98 | _assoc! "${new_hm}" "${key}" "${r}" |
31690700 JM |
99 | done |
100 | r="${new_hm}" ;; | |
101 | *) | |
102 | r="${ast}" ;; | |
103 | esac | |
104 | } | |
105 | ||
31690700 JM |
106 | EVAL () { |
107 | local ast="${1}" env="${2}" | |
108 | while true; do | |
109 | r= | |
110 | [[ "${__ERROR}" ]] && return 1 | |
111 | #_pr_str "${ast}"; echo "EVAL '${r} / ${env}'" | |
112 | if ! _list? "${ast}"; then | |
113 | EVAL_AST "${ast}" "${env}" | |
114 | return | |
115 | fi | |
116 | ||
117 | # apply list | |
118 | MACROEXPAND "${ast}" "${env}" | |
119 | ast="${r}" | |
120 | if ! _list? "${ast}"; then return; fi | |
121 | _nth "${ast}" 0; local a0="${r}" | |
122 | _nth "${ast}" 1; local a1="${r}" | |
123 | _nth "${ast}" 2; local a2="${r}" | |
124 | case "${ANON["${a0}"]}" in | |
125 | def!) local k="${ANON["${a1}"]}" | |
126 | #echo "def! ${k} to ${a2} in ${env}" | |
127 | EVAL "${a2}" "${env}" | |
128 | ENV_SET "${env}" "${k}" "${r}" | |
129 | return ;; | |
130 | let*) ENV "${env}"; local let_env="${r}" | |
131 | local let_pairs=(${ANON["${a1}"]}) | |
132 | local idx=0 | |
133 | #echo "let: [${let_pairs[*]}] for ${a2}" | |
134 | while [[ "${let_pairs["${idx}"]}" ]]; do | |
135 | EVAL "${let_pairs[$(( idx + 1))]}" "${let_env}" | |
136 | ENV_SET "${let_env}" "${ANON["${let_pairs[${idx}]}"]}" "${r}" | |
137 | idx=$(( idx + 2)) | |
138 | done | |
139 | EVAL "${a2}" "${let_env}" | |
140 | return ;; | |
141 | quote) | |
142 | r="${a1}" | |
143 | return ;; | |
144 | quasiquote) | |
145 | QUASIQUOTE "${a1}" | |
146 | EVAL "${r}" "${env}" | |
147 | return ;; | |
148 | defmacro!) | |
149 | local k="${ANON["${a1}"]}" | |
150 | EVAL "${a2}" "${env}" | |
151 | ENV_SET "${env}" "${k}" "${r}" | |
152 | ENV_SET "${env}" "${k}_ismacro_" "yes" | |
153 | return ;; | |
154 | macroexpand) | |
155 | MACROEXPAND "${a1}" "${env}" | |
156 | return ;; | |
157 | sh*) MACROEXPAND "${a1}" "${env}" | |
158 | EVAL "${r}" "${env}" | |
159 | local output="" | |
160 | local line="" | |
161 | while read line; do | |
162 | output="${output}${line}\n" | |
163 | done < <(eval ${ANON["${r}"]}) | |
ea81a808 | 164 | _string "${output}" |
31690700 JM |
165 | return ;; |
166 | try*) MACROEXPAND "${a1}" "${env}" | |
167 | EVAL "${r}" "${env}" | |
168 | [[ -z "${__ERROR}" ]] && return | |
169 | _nth "${a2}" 0; local a20="${r}" | |
170 | if [ "${ANON["${a20}"]}" == "catch__STAR__" ]; then | |
171 | _nth "${a2}" 1; local a21="${r}" | |
172 | _nth "${a2}" 2; local a22="${r}" | |
ea81a808 | 173 | _list "${a21}"; local binds="${r}" |
31690700 JM |
174 | ENV "${env}" "${binds}" "${__ERROR}" |
175 | local try_env="${r}" | |
176 | __ERROR= | |
177 | MACROEXPAND "${a22}" "${try_env}" | |
178 | EVAL "${r}" "${try_env}" | |
179 | fi # if no catch* clause, just propagate __ERROR | |
180 | return ;; | |
181 | do) _count "${ast}" | |
182 | _slice "${ast}" 1 $(( ${r} - 2 )) | |
183 | EVAL_AST "${r}" "${env}" | |
184 | [[ "${__ERROR}" ]] && r= && return 1 | |
8cb5cda4 | 185 | _last "${ast}" |
31690700 JM |
186 | ast="${r}" |
187 | # Continue loop | |
188 | ;; | |
189 | if) EVAL "${a1}" "${env}" | |
190 | if [[ "${r}" == "${__false}" || "${r}" == "${__nil}" ]]; then | |
191 | # eval false form | |
192 | _nth "${ast}" 3; local a3="${r}" | |
193 | if [[ "${a3}" ]]; then | |
194 | ast="${a3}" | |
195 | else | |
196 | r="${__nil}" | |
197 | return | |
198 | fi | |
199 | else | |
200 | # eval true condition | |
201 | ast="${a2}" | |
202 | fi | |
203 | # Continue loop | |
204 | ;; | |
ea81a808 JM |
205 | fn*) _function "ENV \"${env}\" \"${a1}\" \"\${@}\"; \ |
206 | EVAL \"${a2}\" \"\${r}\"" \ | |
207 | "${a2}" "${env}" "${a1}" | |
31690700 JM |
208 | return ;; |
209 | *) EVAL_AST "${ast}" "${env}" | |
210 | [[ "${__ERROR}" ]] && r= && return 1 | |
211 | local el="${r}" | |
8cb5cda4 JM |
212 | _first "${el}"; local f="${ANON["${r}"]}" |
213 | _rest "${el}"; local args="${ANON["${r}"]}" | |
31690700 JM |
214 | #echo "invoke: [${f}] ${args}" |
215 | if [[ "${f//@/ }" != "${f}" ]]; then | |
216 | set -- ${f//@/ } | |
217 | ast="${2}" | |
218 | ENV "${3}" "${4}" ${args} | |
219 | env="${r}" | |
220 | else | |
221 | eval ${f%%@*} ${args} | |
222 | return | |
223 | fi | |
224 | # Continue loop | |
225 | ;; | |
226 | esac | |
227 | done | |
228 | } | |
ea81a808 | 229 | |
86b689f3 | 230 | |
31690700 JM |
231 | PRINT () { |
232 | if [[ "${__ERROR}" ]]; then | |
233 | _pr_str "${__ERROR}" yes | |
234 | r="Error: ${r}" | |
235 | __ERROR= | |
236 | else | |
237 | _pr_str "${1}" yes | |
238 | fi | |
239 | } | |
240 | ||
86b689f3 | 241 | # repl |
31690700 JM |
242 | ENV; REPL_ENV="${r}" |
243 | REP () { | |
244 | r= | |
8cb5cda4 | 245 | READ "${1}" || return 1 |
31690700 JM |
246 | EVAL "${r}" "${REPL_ENV}" |
247 | PRINT "${r}" | |
248 | } | |
249 | ||
8cb5cda4 | 250 | # core.sh: defined using bash |
ea81a808 | 251 | _fref () { _function "${2} \"\${@}\""; ENV_SET "${REPL_ENV}" "${1}" "${r}"; } |
ea81a808 | 252 | for n in "${!core_ns[@]}"; do _fref "${n}" "${core_ns["${n}"]}"; done |
ea81a808 | 253 | _eval () { EVAL "${1}" "${REPL_ENV}"; } |
31690700 | 254 | _fref "eval" _eval |
86b689f3 JM |
255 | _list; argv="${r}" |
256 | for _arg in "${@:2}"; do _string "${_arg}"; _conj! "${argv}" "${r}"; done | |
257 | ENV_SET "${REPL_ENV}" "__STAR__ARGV__STAR__" "${argv}"; | |
31690700 | 258 | |
8cb5cda4 | 259 | # core.mal: defined using the language itself |
db4c329a | 260 | REP "(def! *host-language* \"bash\")" |
31690700 | 261 | REP "(def! not (fn* (a) (if a false true)))" |
8cb5cda4 | 262 | REP "(def! load-file (fn* (f) (eval (read-string (str \"(do \" (slurp f) \")\")))))" |
31690700 JM |
263 | REP "(defmacro! cond (fn* (& xs) (if (> (count xs) 0) (list 'if (first xs) (if (> (count xs) 1) (nth xs 1) (throw \"odd number of forms to cond\")) (cons 'cond (rest (rest xs)))))))" |
264 | REP "(defmacro! or (fn* (& xs) (if (empty? xs) nil (if (= 1 (count xs)) (first xs) \`(let* (or_FIXME ~(first xs)) (if or_FIXME or_FIXME (or ~@(rest xs))))))))" | |
31690700 | 265 | |
86b689f3 | 266 | # load/run file from command line (then exit) |
31690700 | 267 | if [[ "${1}" ]]; then |
86b689f3 JM |
268 | REP "(load-file \"${1}\")" |
269 | exit 0 | |
270 | fi | |
271 | ||
272 | # repl loop | |
273 | REP "(println (str \"Mal [\" *host-language* \"]\"))" | |
274 | while true; do | |
275 | READLINE "user> " || exit "$?" | |
276 | [[ "${r}" ]] && REP "${r}" && echo "${r}" | |
277 | done |