2 * Copyright © 2016 Keith Packard <keithp@keithp.com>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
15 #include "ao_scheme.h"
16 #include "ao_scheme_read.h"
20 static const uint16_t lex_classes[128] = {
53 PRINTABLE|WHITE, /* */
55 PRINTABLE|STRINGC, /* " */
60 PRINTABLE|SPECIAL, /* ' */
61 PRINTABLE|SPECIAL, /* ( */
62 PRINTABLE|SPECIAL, /* ) */
64 PRINTABLE|SIGN, /* + */
65 PRINTABLE|SPECIAL_QUASI, /* , */
66 PRINTABLE|SIGN, /* - */
67 PRINTABLE|SPECIAL|FLOATC, /* . */
69 PRINTABLE|DIGIT, /* 0 */
70 PRINTABLE|DIGIT, /* 1 */
71 PRINTABLE|DIGIT, /* 2 */
72 PRINTABLE|DIGIT, /* 3 */
73 PRINTABLE|DIGIT, /* 4 */
74 PRINTABLE|DIGIT, /* 5 */
75 PRINTABLE|DIGIT, /* 6 */
76 PRINTABLE|DIGIT, /* 7 */
77 PRINTABLE|DIGIT, /* 8 */
78 PRINTABLE|DIGIT, /* 9 */
80 PRINTABLE|COMMENT, /* ; */
86 PRINTABLE|ALPHA|HEX_LETTER, /* A */
87 PRINTABLE|ALPHA|HEX_LETTER, /* B */
88 PRINTABLE|ALPHA|HEX_LETTER, /* C */
89 PRINTABLE|ALPHA|HEX_LETTER, /* D */
90 PRINTABLE|ALPHA|FLOATC|HEX_LETTER,/* E */
91 PRINTABLE|ALPHA|HEX_LETTER, /* F */
92 PRINTABLE|ALPHA, /* G */
93 PRINTABLE|ALPHA, /* H */
94 PRINTABLE|ALPHA, /* I */
95 PRINTABLE|ALPHA, /* J */
96 PRINTABLE|ALPHA, /* K */
97 PRINTABLE|ALPHA, /* L */
98 PRINTABLE|ALPHA, /* M */
99 PRINTABLE|ALPHA, /* N */
100 PRINTABLE|ALPHA, /* O */
101 PRINTABLE|ALPHA, /* P */
102 PRINTABLE|ALPHA, /* Q */
103 PRINTABLE|ALPHA, /* R */
104 PRINTABLE|ALPHA, /* S */
105 PRINTABLE|ALPHA, /* T */
106 PRINTABLE|ALPHA, /* U */
107 PRINTABLE|ALPHA, /* V */
108 PRINTABLE|ALPHA, /* W */
109 PRINTABLE|ALPHA, /* X */
110 PRINTABLE|ALPHA, /* Y */
111 PRINTABLE|ALPHA, /* Z */
117 PRINTABLE|SPECIAL_QUASI, /* ` */
118 PRINTABLE|ALPHA|HEX_LETTER, /* a */
119 PRINTABLE|ALPHA|HEX_LETTER, /* b */
120 PRINTABLE|ALPHA|HEX_LETTER, /* c */
121 PRINTABLE|ALPHA|HEX_LETTER, /* d */
122 PRINTABLE|ALPHA|FLOATC|HEX_LETTER,/* e */
123 PRINTABLE|ALPHA|HEX_LETTER, /* f */
124 PRINTABLE|ALPHA, /* g */
125 PRINTABLE|ALPHA, /* h */
126 PRINTABLE|ALPHA, /* i */
127 PRINTABLE|ALPHA, /* j */
128 PRINTABLE|ALPHA, /* k */
129 PRINTABLE|ALPHA, /* l */
130 PRINTABLE|ALPHA, /* m */
131 PRINTABLE|ALPHA, /* n */
132 PRINTABLE|ALPHA, /* o */
133 PRINTABLE|ALPHA, /* p */
134 PRINTABLE|ALPHA, /* q */
135 PRINTABLE|ALPHA, /* r */
136 PRINTABLE|ALPHA, /* s */
137 PRINTABLE|ALPHA, /* t */
138 PRINTABLE|ALPHA, /* u */
139 PRINTABLE|ALPHA, /* v */
140 PRINTABLE|ALPHA, /* w */
141 PRINTABLE|ALPHA, /* x */
142 PRINTABLE|ALPHA, /* y */
143 PRINTABLE|ALPHA, /* z */
151 static int lex_unget_c;
173 static uint16_t lex_class;
183 lex_class = ENDOFFILE;
186 lex_class = lex_classes[c];
188 } while (lex_class & IGNORE);
202 lex_class = ENDOFFILE;
237 if (c < '0' || '7' < c) {
241 v = (v << 3) + c - '0';
250 #ifndef AO_SCHEME_TOKEN_MAX
251 #define AO_SCHEME_TOKEN_MAX 128
254 static char token_string[AO_SCHEME_TOKEN_MAX];
255 static int32_t token_int;
256 static int token_len;
258 static void start_token(void) {
262 static void add_token(int c) {
263 if (c && token_len < AO_SCHEME_TOKEN_MAX - 1)
264 token_string[token_len++] = c;
267 static void end_token(void) {
268 token_string[token_len] = '\0';
271 #ifdef AO_SCHEME_FEATURE_FLOAT
272 static float token_float;
279 static const struct namedfloat namedfloats[] = {
280 { .name = "+inf.0", .value = INFINITY },
281 { .name = "-inf.0", .value = -INFINITY },
282 { .name = "+nan.0", .value = NAN },
283 { .name = "-nan.0", .value = NAN },
286 #define NUM_NAMED_FLOATS (sizeof namedfloats / sizeof namedfloats[0])
290 parse_int(FILE *in, int base)
298 if ((lex_class & HEX_DIGIT) == 0) {
302 if ('0' <= c && c <= '9')
305 cval = (c | ('a' - 'A')) - 'a' + 10;
306 token_int = token_int * base + cval;
319 if (lex_class & ENDOFFILE)
322 if (lex_class & WHITE)
325 if (lex_class & COMMENT) {
326 while ((c = lexc(in)) != '\n') {
327 if (lex_class & ENDOFFILE)
333 if (lex_class & SPECIAL) {
345 #ifdef AO_SCHEME_FEATURE_QUASI
351 return UNQUOTE_SPLICING;
366 #ifdef AO_SCHEME_FEATURE_VECTOR
373 if (token_len == 0) {
375 if (!(lex_class & ALPHA))
378 if (lex_class & ALPHA)
388 token_int = token_string[0];
389 else if (!strcmp(token_string, "space"))
391 else if (!strcmp(token_string, "newline"))
393 else if (!strcmp(token_string, "tab"))
395 else if (!strcmp(token_string, "return"))
397 else if (!strcmp(token_string, "formfeed"))
400 ao_scheme_error(AO_SCHEME_INVALID, "invalid character token #\\%s", token_string);
405 return parse_int(in, 16);
407 return parse_int(in, 8);
409 return parse_int(in, 2);
412 if (lex_class & STRINGC) {
417 if (lex_class & (STRINGC|ENDOFFILE)) {
424 if (lex_class & PRINTABLE) {
425 #ifdef AO_SCHEME_FEATURE_FLOAT
435 if (!(lex_class & NUMBER)) {
437 #ifdef AO_SCHEME_FEATURE_FLOAT
441 #ifdef AO_SCHEME_FEATURE_FLOAT
442 if (!(lex_class & INTEGER))
444 if (token_len != epos &&
453 #ifdef AO_SCHEME_FEATURE_FLOAT
454 if (c == '.' && epos != 0)
456 if (c == 'e' || c == 'E') {
460 epos = token_len + 1;
463 if (lex_class & DIGIT) {
466 token_int = token_int * 10 + c - '0';
471 if ((lex_class & (NOTNAME))
472 #ifdef AO_SCHEME_FEATURE_FLOAT
473 && (c != '.' || !isfloat)
476 #ifdef AO_SCHEME_FEATURE_FLOAT
481 if (isint && hasdigit) {
483 token_int = -token_int;
486 #ifdef AO_SCHEME_FEATURE_FLOAT
487 if (isfloat && hasdigit) {
488 token_float = strtof(token_string, NULL);
491 for (u = 0; u < NUM_NAMED_FLOATS; u++)
492 if (!strcmp(namedfloats[u].name, token_string)) {
493 token_float = namedfloats[u].value;
504 static inline int lex(FILE *in)
506 int parse_token = _lex(in);
507 RDBGI("token %d \"%s\"\n", parse_token, token_string);
511 static int parse_token;
513 int ao_scheme_read_list;
514 struct ao_scheme_cons *ao_scheme_read_cons;
515 struct ao_scheme_cons *ao_scheme_read_cons_tail;
516 struct ao_scheme_cons *ao_scheme_read_stack;
517 static int ao_scheme_read_state;
519 #define READ_IN_QUOTE 0x01
520 #define READ_SAW_DOT 0x02
521 #define READ_DONE_DOT 0x04
522 #define READ_SAW_VECTOR 0x08
525 push_read_stack(int read_state)
527 RDBGI("push read stack %p 0x%x\n", ao_scheme_read_cons, read_state);
529 if (ao_scheme_read_list) {
530 ao_scheme_read_stack = ao_scheme_cons_cons(ao_scheme_cons_poly(ao_scheme_read_cons),
531 ao_scheme_cons(ao_scheme_int_poly(read_state),
532 ao_scheme_cons_poly(ao_scheme_read_stack)));
533 if (!ao_scheme_read_stack)
536 ao_scheme_read_state = read_state;
537 ao_scheme_read_cons = NULL;
538 ao_scheme_read_cons_tail = NULL;
546 if (ao_scheme_read_list) {
547 ao_scheme_read_cons = ao_scheme_poly_cons(ao_scheme_read_stack->car);
548 ao_scheme_read_stack = ao_scheme_poly_cons(ao_scheme_read_stack->cdr);
549 read_state = ao_scheme_poly_int(ao_scheme_read_stack->car);
550 ao_scheme_read_stack = ao_scheme_poly_cons(ao_scheme_read_stack->cdr);
551 for (ao_scheme_read_cons_tail = ao_scheme_read_cons;
552 ao_scheme_read_cons_tail && ao_scheme_read_cons_tail->cdr;
553 ao_scheme_read_cons_tail = ao_scheme_poly_cons(ao_scheme_read_cons_tail->cdr))
556 read_state = ao_scheme_read_state;
557 ao_scheme_read_cons = NULL;
558 ao_scheme_read_cons_tail = NULL;
559 ao_scheme_read_stack = NULL;
560 ao_scheme_read_state = 0;
563 RDBGI("pop read stack %p %d\n", ao_scheme_read_cons, read_state);
567 #ifdef AO_SCHEME_FEATURE_VECTOR
568 #define is_open(t) ((t) == OPEN || (t) == OPEN_VECTOR)
570 #define is_open(t) ((t) == OPEN)
574 ao_scheme_read(FILE *in)
576 struct ao_scheme_atom *atom;
577 struct ao_scheme_string *string;
579 ao_poly v = AO_SCHEME_NIL;
581 ao_scheme_read_list = 0;
583 ao_scheme_read_cons = ao_scheme_read_cons_tail = ao_scheme_read_stack = NULL;
585 parse_token = lex(in);
586 while (is_open(parse_token)) {
587 #ifdef AO_SCHEME_FEATURE_VECTOR
588 if (parse_token == OPEN_VECTOR)
589 read_state |= READ_SAW_VECTOR;
591 if (!push_read_stack(read_state))
592 return AO_SCHEME_NIL;
593 ao_scheme_read_list++;
595 parse_token = lex(in);
598 switch (parse_token) {
601 if (ao_scheme_read_list)
602 ao_scheme_error(AO_SCHEME_EOF, "unexpected end of file");
603 return _ao_scheme_atom_eof;
606 atom = ao_scheme_atom_intern(token_string);
608 v = ao_scheme_atom_poly(atom);
613 v = ao_scheme_integer_poly(token_int);
615 #ifdef AO_SCHEME_FEATURE_FLOAT
617 v = ao_scheme_float_get(token_float);
621 v = _ao_scheme_bool_true;
624 v = _ao_scheme_bool_false;
627 string = ao_scheme_string_new(token_string);
629 v = ao_scheme_string_poly(string);
634 #ifdef AO_SCHEME_FEATURE_QUASI
637 case UNQUOTE_SPLICING:
639 if (!push_read_stack(read_state))
640 return AO_SCHEME_NIL;
641 ao_scheme_read_list++;
642 read_state = READ_IN_QUOTE;
643 switch (parse_token) {
645 v = _ao_scheme_atom_quote;
647 #ifdef AO_SCHEME_FEATURE_QUASI
649 v = _ao_scheme_atom_quasiquote;
652 v = _ao_scheme_atom_unquote;
654 case UNQUOTE_SPLICING:
655 v = _ao_scheme_atom_unquote2dsplicing;
661 if (!ao_scheme_read_list) {
665 v = ao_scheme_cons_poly(ao_scheme_read_cons);
666 --ao_scheme_read_list;
667 read_state = pop_read_stack();
668 #ifdef AO_SCHEME_FEATURE_VECTOR
669 if (read_state & READ_SAW_VECTOR) {
670 v = ao_scheme_vector_poly(ao_scheme_list_to_vector(ao_scheme_poly_cons(v)));
671 read_state &= ~READ_SAW_VECTOR;
676 if (!ao_scheme_read_list) {
677 ao_scheme_error(AO_SCHEME_INVALID, ". outside of cons");
678 return AO_SCHEME_NIL;
680 if (!ao_scheme_read_cons) {
681 ao_scheme_error(AO_SCHEME_INVALID, ". first in cons");
682 return AO_SCHEME_NIL;
684 read_state |= READ_SAW_DOT;
688 /* loop over QUOTE ends */
690 if (!ao_scheme_read_list)
693 if (read_state & READ_DONE_DOT) {
694 ao_scheme_error(AO_SCHEME_INVALID, ". not last in cons");
695 return AO_SCHEME_NIL;
698 if (read_state & READ_SAW_DOT) {
699 read_state |= READ_DONE_DOT;
700 ao_scheme_read_cons_tail->cdr = v;
702 struct ao_scheme_cons *read = ao_scheme_cons_cons(v, AO_SCHEME_NIL);
704 return AO_SCHEME_NIL;
706 if (ao_scheme_read_cons_tail)
707 ao_scheme_read_cons_tail->cdr = ao_scheme_cons_poly(read);
709 ao_scheme_read_cons = read;
710 ao_scheme_read_cons_tail = read;
713 if (!(read_state & READ_IN_QUOTE) || !ao_scheme_read_cons->cdr)
716 v = ao_scheme_cons_poly(ao_scheme_read_cons);
717 --ao_scheme_read_list;
718 read_state = pop_read_stack();