| 1 | @include "types.awk" |
| 2 | @include "reader.awk" |
| 3 | @include "printer.awk" |
| 4 | @include "env.awk" |
| 5 | |
| 6 | function READ(str) |
| 7 | { |
| 8 | return reader_read_str(str) |
| 9 | } |
| 10 | |
| 11 | function eval_ast(ast, env, i, idx, len, new_idx, ret) |
| 12 | { |
| 13 | switch (ast) { |
| 14 | case /^'/: |
| 15 | ret = env_get(env, ast) |
| 16 | if (ret !~ /^!/) { |
| 17 | types_addref(ret) |
| 18 | } |
| 19 | return ret |
| 20 | case /^[([]/: |
| 21 | idx = substr(ast, 2) |
| 22 | len = types_heap[idx]["len"] |
| 23 | new_idx = types_allocate() |
| 24 | for (i = 0; i < len; ++i) { |
| 25 | ret = EVAL(types_addref(types_heap[idx][i]), env) |
| 26 | if (ret ~ /^!/) { |
| 27 | types_heap[new_idx]["len"] = i |
| 28 | types_release(substr(ast, 1, 1) new_idx) |
| 29 | return ret |
| 30 | } |
| 31 | types_heap[new_idx][i] = ret |
| 32 | } |
| 33 | types_heap[new_idx]["len"] = len |
| 34 | return substr(ast, 1, 1) new_idx |
| 35 | case /^\{/: |
| 36 | idx = substr(ast, 2) |
| 37 | new_idx = types_allocate() |
| 38 | for (i in types_heap[idx]) { |
| 39 | if (i ~ /^[":]/) { |
| 40 | ret = EVAL(types_addref(types_heap[idx][i]), env) |
| 41 | if (ret ~ /^!/) { |
| 42 | types_release("{" new_idx) |
| 43 | return ret |
| 44 | } |
| 45 | types_heap[new_idx][i] = ret |
| 46 | } |
| 47 | } |
| 48 | return "{" new_idx |
| 49 | default: |
| 50 | return ast |
| 51 | } |
| 52 | } |
| 53 | |
| 54 | function EVAL_def(ast, env, idx, sym, ret, len) |
| 55 | { |
| 56 | idx = substr(ast, 2) |
| 57 | if (types_heap[idx]["len"] != 3) { |
| 58 | len = types_heap[idx]["len"] |
| 59 | types_release(ast) |
| 60 | env_release(env) |
| 61 | return "!\"Invalid argument length for 'def!'. Expects exactly 2 arguments, supplied" (len - 1) "." |
| 62 | } |
| 63 | sym = types_heap[idx][1] |
| 64 | if (sym !~ /^'/) { |
| 65 | types_release(ast) |
| 66 | env_release(env) |
| 67 | return "!\"Incompatible type for argument 1 of 'def!'. Expects symbol, supplied " types_typename(sym) "." |
| 68 | } |
| 69 | ret = EVAL(types_addref(types_heap[idx][2]), env) |
| 70 | if (ret !~ /^!/) { |
| 71 | env_set(env, sym, ret) |
| 72 | types_addref(ret) |
| 73 | } |
| 74 | types_release(ast) |
| 75 | env_release(env) |
| 76 | return ret |
| 77 | } |
| 78 | |
| 79 | function EVAL_let(ast, env, idx, params, params_idx, params_len, new_env, i, sym, ret, body, len) |
| 80 | { |
| 81 | idx = substr(ast, 2) |
| 82 | if (types_heap[idx]["len"] != 3) { |
| 83 | len = types_heap[idx]["len"] |
| 84 | types_release(ast) |
| 85 | env_release(env) |
| 86 | return "!\"Invalid argument length for 'let*'. Expects exactly 2 arguments, supplied " (len - 1) "." |
| 87 | } |
| 88 | params = types_heap[idx][1] |
| 89 | if (params !~ /^[([]/) { |
| 90 | types_release(ast) |
| 91 | env_release(env) |
| 92 | return "!\"Incompatible type for argument 1 of 'let*'. Expects list or vector, supplied " types_typename(params) "." |
| 93 | } |
| 94 | params_idx = substr(params, 2) |
| 95 | params_len = types_heap[params_idx]["len"] |
| 96 | if (params_len % 2 != 0) { |
| 97 | types_release(ast) |
| 98 | env_release(env) |
| 99 | return "!\"Invalid elements count for argument 1 of 'let*'. Expects even number of elements, supplied " params_len "." |
| 100 | } |
| 101 | new_env = env_new(env) |
| 102 | env_release(env) |
| 103 | for (i = 0; i < params_len; i += 2) { |
| 104 | sym = types_heap[params_idx][i] |
| 105 | if (sym !~ /^'/) { |
| 106 | types_release(ast) |
| 107 | env_release(new_env) |
| 108 | return "!\"Incompatible type for odd element of argument 1 of 'let*'. Expects symbol, supplied " types_typename(sym) "." |
| 109 | } |
| 110 | ret = EVAL(types_addref(types_heap[params_idx][i + 1]), new_env) |
| 111 | if (ret ~ /^!/) { |
| 112 | types_release(ast) |
| 113 | env_release(new_env) |
| 114 | return ret |
| 115 | } |
| 116 | env_set(new_env, sym, ret) |
| 117 | } |
| 118 | types_addref(body = types_heap[idx][2]) |
| 119 | types_release(ast) |
| 120 | ret = EVAL(body, new_env) |
| 121 | env_release(new_env) |
| 122 | return ret |
| 123 | } |
| 124 | |
| 125 | function EVAL(ast, env, new_ast, ret, idx, f, f_idx) |
| 126 | { |
| 127 | env_addref(env) |
| 128 | if (ast !~ /^\(/) { |
| 129 | ret = eval_ast(ast, env) |
| 130 | types_release(ast) |
| 131 | env_release(env) |
| 132 | return ret |
| 133 | } |
| 134 | idx = substr(ast, 2) |
| 135 | if (types_heap[idx]["len"] == 0) { |
| 136 | env_release(env) |
| 137 | return ast |
| 138 | } |
| 139 | switch (types_heap[idx][0]) { |
| 140 | case "'def!": |
| 141 | return EVAL_def(ast, env) |
| 142 | case "'let*": |
| 143 | return EVAL_let(ast, env) |
| 144 | default: |
| 145 | new_ast = eval_ast(ast, env) |
| 146 | types_release(ast) |
| 147 | env_release(env) |
| 148 | if (new_ast ~ /^!/) { |
| 149 | return new_ast |
| 150 | } |
| 151 | idx = substr(new_ast, 2) |
| 152 | f = types_heap[idx][0] |
| 153 | if (f ~ /^&/) { |
| 154 | f_idx = substr(f, 2) |
| 155 | ret = @f_idx(idx) |
| 156 | types_release(new_ast) |
| 157 | return ret |
| 158 | } else { |
| 159 | types_release(new_ast) |
| 160 | return "!\"First element of list must be function, supplied " types_typename(f) "." |
| 161 | } |
| 162 | } |
| 163 | } |
| 164 | |
| 165 | function PRINT(expr, str) |
| 166 | { |
| 167 | str = printer_pr_str(expr, 1) |
| 168 | types_release(expr) |
| 169 | return str |
| 170 | } |
| 171 | |
| 172 | function rep(str, ast, expr) |
| 173 | { |
| 174 | ast = READ(str) |
| 175 | if (ast ~ /^!/) { |
| 176 | return ast |
| 177 | } |
| 178 | expr = EVAL(ast, repl_env) |
| 179 | if (expr ~ /^!/) { |
| 180 | return expr |
| 181 | } |
| 182 | return PRINT(expr) |
| 183 | } |
| 184 | |
| 185 | function add(idx, lhs, rhs) |
| 186 | { |
| 187 | if (types_heap[idx]["len"] != 3) { |
| 188 | return "!\"Invalid argument length for builtin function '+'. Expects exactly 2 arguments, supplied " (types_heap[idx]["len"] - 1) "." |
| 189 | } |
| 190 | lhs = types_heap[idx][1] |
| 191 | if (lhs !~ /^\+/) { |
| 192 | return "!\"Incompatible type for argument 1 of builtin function '+'. Expects number, supplied " types_typename(lhs) "." |
| 193 | } |
| 194 | rhs = types_heap[idx][2] |
| 195 | if (rhs !~ /^\+/) { |
| 196 | return "!\"Incompatible type for argument 2 of builtin function '+'. Expects number, supplied " types_typename(rhs) "." |
| 197 | } |
| 198 | return "+" (substr(lhs, 2) + substr(rhs, 2)) |
| 199 | } |
| 200 | |
| 201 | function subtract(idx, lhs, rhs) |
| 202 | { |
| 203 | if (types_heap[idx]["len"] != 3) { |
| 204 | return "!\"Invalid argument length for builtin function '-'. Expects exactly 2 arguments, supplied " (types_heap[idx]["len"] - 1) "." |
| 205 | } |
| 206 | lhs = types_heap[idx][1] |
| 207 | if (lhs !~ /^\+/) { |
| 208 | return "!\"Incompatible type for argument 1 of builtin function '-'. Expects number, supplied " types_typename(lhs) "." |
| 209 | } |
| 210 | rhs = types_heap[idx][2] |
| 211 | if (rhs !~ /^\+/) { |
| 212 | return "!\"Incompatible type for argument 2 of builtin function '-'. Expects number, supplied " types_typename(rhs) "." |
| 213 | } |
| 214 | return "+" (substr(lhs, 2) - substr(rhs, 2)) |
| 215 | } |
| 216 | |
| 217 | function multiply(idx, lhs, rhs) |
| 218 | { |
| 219 | if (types_heap[idx]["len"] != 3) { |
| 220 | return "!\"Invalid argument length for builtin function '*'. Expects exactly 2 arguments, supplied " (types_heap[idx]["len"] - 1) "." |
| 221 | } |
| 222 | lhs = types_heap[idx][1] |
| 223 | if (lhs !~ /^\+/) { |
| 224 | return "!\"Incompatible type for argument 1 of builtin function '*'. Expects number, supplied " types_typename(lhs) "." |
| 225 | } |
| 226 | rhs = types_heap[idx][2] |
| 227 | if (rhs !~ /^\+/) { |
| 228 | return "!\"Incompatible type for argument 2 of builtin function '*'. Expects number, supplied " types_typename(rhs) "." |
| 229 | } |
| 230 | return "+" (substr(lhs, 2) * substr(rhs, 2)) |
| 231 | } |
| 232 | |
| 233 | function divide(idx, lhs, rhs) |
| 234 | { |
| 235 | if (types_heap[idx]["len"] != 3) { |
| 236 | return "!\"Invalid argument length for builtin function '/'. Expects exactly 2 arguments, supplied " (types_heap[idx]["len"] - 1) "." |
| 237 | } |
| 238 | lhs = types_heap[idx][1] |
| 239 | if (lhs !~ /^\+/) { |
| 240 | return "!\"Incompatible type for argument 1 of builtin function '/'. Expects number, supplied " types_typename(lhs) "." |
| 241 | } |
| 242 | rhs = types_heap[idx][2] |
| 243 | if (rhs !~ /^\+/) { |
| 244 | return "!\"Incompatible type for argument 2 of builtin function '/'. Expects number, supplied " types_typename(rhs) "." |
| 245 | } |
| 246 | return "+" int(substr(lhs, 2) / substr(rhs, 2)) |
| 247 | } |
| 248 | |
| 249 | function main(str, ret) |
| 250 | { |
| 251 | repl_env = env_new() |
| 252 | env_set(repl_env, "'+", "&add") |
| 253 | env_set(repl_env, "'-", "&subtract") |
| 254 | env_set(repl_env, "'*", "&multiply") |
| 255 | env_set(repl_env, "'/", "÷") |
| 256 | |
| 257 | while (1) { |
| 258 | printf("user> ") |
| 259 | if (getline str <= 0) { |
| 260 | break |
| 261 | } |
| 262 | ret = rep(str) |
| 263 | if (ret ~ /^!/) { |
| 264 | print "ERROR: " printer_pr_str(substr(ret, 2)) |
| 265 | } else { |
| 266 | print ret |
| 267 | } |
| 268 | } |
| 269 | } |
| 270 | |
| 271 | BEGIN { |
| 272 | main() |
| 273 | env_check(0) |
| 274 | env_dump() |
| 275 | types_dump() |
| 276 | exit(0) |
| 277 | } |