reader by readtable
This commit is contained in:
parent
8dae333bbd
commit
058de5b7e9
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@ -14,11 +14,24 @@ enum pic_typecase {
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PIC_CASE_FOLD,
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};
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struct pic_trie {
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struct pic_trie *table[256];
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struct pic_proc *proc;
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};
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struct pic_reader {
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short typecase;
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xhash labels;
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struct pic_trie *trie;
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};
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void pic_init_reader(pic_state *);
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void pic_define_reader(pic_state *, const char *, pic_func_t);
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struct pic_trie *pic_trie_new(pic_state *);
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void pic_trie_delete(pic_state *, struct pic_trie *);
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#if defined(__cplusplus)
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}
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#endif
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19
src/gc.c
19
src/gc.c
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@ -21,6 +21,7 @@
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#include "picrin/data.h"
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#include "picrin/dict.h"
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#include "picrin/record.h"
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#include "picrin/read.h"
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#if GC_DEBUG
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# include <string.h>
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@ -550,6 +551,21 @@ gc_mark(pic_state *pic, pic_value v)
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gc_mark_object(pic, obj);
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}
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static void
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gc_mark_trie(pic_state *pic, struct pic_trie *trie)
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{
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size_t i;
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for (i = 0; i < sizeof trie->table / sizeof(struct pic_trie *); ++i) {
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if (trie->table[i] != NULL) {
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gc_mark_trie(pic, trie->table[i]);
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}
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}
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if (trie->proc != NULL) {
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gc_mark_object(pic, (struct pic_object *)trie->proc);
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}
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}
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static void
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gc_mark_phase(pic_state *pic)
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{
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@ -604,6 +620,9 @@ gc_mark_phase(pic_state *pic)
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}
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}
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/* readers */
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gc_mark_trie(pic, pic->reader->trie);
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/* library table */
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gc_mark(pic, pic->libs);
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}
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@ -6,6 +6,7 @@
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#include "picrin.h"
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#include "picrin/pair.h"
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#include "picrin/read.h"
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#include "picrin/lib.h"
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#include "picrin/macro.h"
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#include "picrin/error.h"
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@ -73,6 +74,8 @@ pic_init_core(pic_state *pic)
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{
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size_t ai = pic_gc_arena_preserve(pic);
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pic_init_reader(pic);
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pic_deflibrary (pic, "(picrin base core)") {
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pic_define_syntactic_keyword(pic, pic->lib->env, pic->sDEFINE, pic->rDEFINE);
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pic_define_syntactic_keyword(pic, pic->lib->env, pic->sSETBANG, pic->rSETBANG);
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199
src/read.c
199
src/read.c
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@ -13,6 +13,7 @@
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#include "picrin/vector.h"
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#include "picrin/blob.h"
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#include "picrin/port.h"
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#include "picrin/proc.h"
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static pic_value read(pic_state *pic, struct pic_port *port, int c);
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static pic_value read_nullable(pic_state *pic, struct pic_port *port, int c);
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@ -665,74 +666,28 @@ read_unmatch(pic_state *pic, struct pic_port *port, int c)
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read_error(pic, "unmatched parenthesis");
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}
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static pic_value
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read_dispatch(pic_state *pic, struct pic_port *port, int c)
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{
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c = next(port);
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switch (c) {
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case '!':
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return read_directive(pic, port, c);
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case '|':
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return read_block_comment(pic, port, c);
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case ';':
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return read_datum_comment(pic, port, c);
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case 't': case 'f':
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return read_boolean(pic, port, c);
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case '\\':
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return read_char(pic, port, c);
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case '(':
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return read_vector(pic, port, c);
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case '0': case '1': case '2': case '3': case '4':
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case '5': case '6': case '7': case '8': case '9':
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return read_label(pic, port, c);
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case 'u':
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return read_unsigned_blob(pic, port, c);
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case '.':
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return read_eval(pic, port, c);
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default:
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read_error(pic, "unexpected dispatch character");
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}
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}
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static pic_value
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read_nullable(pic_state *pic, struct pic_port *port, int c)
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{
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struct pic_trie *trie = pic->reader->trie;
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c = skip(port, c);
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if (c == EOF) {
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read_error(pic, "unexpected EOF");
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}
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switch (c) {
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case ')':
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return read_unmatch(pic, port, c);
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case ';':
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return read_comment(pic, port, c);
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case '#':
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return read_dispatch(pic, port, c);
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case '\'':
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return read_quote(pic, port, c);
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case '`':
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return read_quasiquote(pic, port, c);
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case ',':
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return read_comma(pic, port, c);
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case '"':
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return read_string(pic, port, c);
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case '|':
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return read_pipe(pic, port, c);
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case '0': case '1': case '2': case '3': case '4':
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case '5': case '6': case '7': case '8': case '9':
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return read_number(pic, port, c);
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case '+':
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return read_plus(pic, port, c);
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case '-':
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return read_minus(pic, port, c);
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case '(': case '[':
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return read_pair(pic, port, c);
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default:
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return read_symbol(pic, port, c);
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if (trie->table[c] == NULL) {
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read_error(pic, "invalid character at the seeker head");
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}
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for (trie = trie->table[c]; trie->table[peek(port)] != NULL; trie = trie->table[c]) {
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c = next(port);
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}
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if (trie->proc == NULL) {
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read_error(pic, "no reader registered for current string");
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}
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return pic_apply2(pic, trie->proc, pic_obj_value(port), pic_char_value(c));
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}
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static pic_value
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@ -751,6 +706,134 @@ read(pic_state *pic, struct pic_port *port, int c)
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return val;
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}
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struct pic_trie *
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pic_trie_new(pic_state *pic)
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{
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struct pic_trie *trie;
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trie = pic_alloc(pic, sizeof(struct pic_trie));
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trie->proc = NULL;
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memset(trie->table, 0, sizeof trie->table);
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return trie;
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}
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void
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pic_trie_delete(pic_state *pic, struct pic_trie *trie)
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{
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size_t i;
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for (i = 0; i < sizeof trie->table / sizeof(struct pic_trie *); ++i) {
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if (trie->table[i] != NULL) {
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pic_trie_delete(pic, trie->table[i]);
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}
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}
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pic_free(pic, trie);
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}
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void
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pic_define_reader(pic_state *pic, const char *str, pic_func_t reader)
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{
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struct pic_trie *trie = pic->reader->trie;
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int c;
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while ((c = *str++)) {
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if (trie->table[c] == NULL) {
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trie->table[c] = pic_trie_new(pic);
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}
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trie = trie->table[c];
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}
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trie->proc = pic_proc_new(pic, reader, "reader");
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}
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#define DEFINE_READER(name) \
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static pic_value \
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pic_##name(pic_state *pic) \
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{ \
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struct pic_port *port; \
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char c; \
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\
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pic_get_args(pic, "pc", &port, &c); \
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\
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return name(pic, port, c); \
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}
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DEFINE_READER(read_unmatch)
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DEFINE_READER(read_comment)
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DEFINE_READER(read_quote)
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DEFINE_READER(read_quasiquote)
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DEFINE_READER(read_comma)
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DEFINE_READER(read_string)
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DEFINE_READER(read_pipe)
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DEFINE_READER(read_plus)
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DEFINE_READER(read_minus)
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DEFINE_READER(read_pair)
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DEFINE_READER(read_directive)
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DEFINE_READER(read_block_comment)
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DEFINE_READER(read_datum_comment)
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DEFINE_READER(read_boolean)
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DEFINE_READER(read_char)
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DEFINE_READER(read_vector)
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DEFINE_READER(read_unsigned_blob)
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DEFINE_READER(read_eval)
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DEFINE_READER(read_symbol)
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DEFINE_READER(read_number)
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DEFINE_READER(read_label)
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void
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pic_init_reader(pic_state *pic)
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{
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static const char INIT[] = "!$%&*./:<=>?@^_~";
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char buf[3] = { 0 };
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size_t i;
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pic_define_reader(pic, ")", pic_read_unmatch);
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pic_define_reader(pic, ";", pic_read_comment);
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pic_define_reader(pic, "'", pic_read_quote);
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pic_define_reader(pic, "`", pic_read_quasiquote);
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pic_define_reader(pic, ",", pic_read_comma);
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pic_define_reader(pic, "\"", pic_read_string);
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pic_define_reader(pic, "|", pic_read_pipe);
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pic_define_reader(pic, "+", pic_read_plus);
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pic_define_reader(pic, "-", pic_read_minus);
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pic_define_reader(pic, "(", pic_read_pair);
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pic_define_reader(pic, "[", pic_read_pair);
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pic_define_reader(pic, "#!", pic_read_directive);
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pic_define_reader(pic, "#|", pic_read_block_comment);
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pic_define_reader(pic, "#;", pic_read_datum_comment);
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pic_define_reader(pic, "#t", pic_read_boolean);
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pic_define_reader(pic, "#f", pic_read_boolean);
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pic_define_reader(pic, "#\\", pic_read_char);
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pic_define_reader(pic, "#(", pic_read_vector);
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pic_define_reader(pic, "#u", pic_read_unsigned_blob);
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pic_define_reader(pic, "#.", pic_read_eval);
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/* read number */
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for (buf[0] = '0'; buf[0] <= '9'; ++buf[0]) {
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pic_define_reader(pic, buf, pic_read_number);
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}
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/* read symbol */
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for (buf[0] = 'a'; buf[0] <= 'z'; ++buf[0]) {
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pic_define_reader(pic, buf, pic_read_symbol);
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}
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for (buf[0] = 'A'; buf[0] <= 'Z'; ++buf[0]) {
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pic_define_reader(pic, buf, pic_read_symbol);
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}
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for (i = 0; i < sizeof INIT; ++i) {
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buf[0] = INIT[i];
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pic_define_reader(pic, buf, pic_read_symbol);
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}
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/* read label */
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buf[0] = '#';
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for (buf[1] = '0'; buf[1] <= '9'; ++buf[1]) {
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pic_define_reader(pic, buf, pic_read_label);
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}
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}
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pic_value
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pic_read(pic_state *pic, struct pic_port *port)
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{
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@ -62,6 +62,7 @@ pic_open(int argc, char *argv[], char **envp)
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/* reader */
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pic->reader = malloc(sizeof(struct pic_reader));
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pic->reader->typecase = PIC_CASE_DEFAULT;
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pic->reader->trie = pic_trie_new(pic);
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xh_init_int(&pic->reader->labels, sizeof(pic_value));
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/* error handling */
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@ -181,6 +182,7 @@ pic_close(pic_state *pic)
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/* free reader struct */
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xh_destroy(&pic->reader->labels);
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pic_trie_delete(pic, pic->reader->trie);
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free(pic->reader);
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/* free global stacks */
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