--- /dev/null
+/*
+ * Copyright © 2016 Keith Packard <keithp@keithp.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+
+#include "ao_lisp.h"
+#include "ao_lisp_read.h"
+
+static const uint16_t lex_classes[128] = {
+ IGNORE, /* ^@ */
+ IGNORE, /* ^A */
+ IGNORE, /* ^B */
+ IGNORE, /* ^C */
+ IGNORE, /* ^D */
+ IGNORE, /* ^E */
+ IGNORE, /* ^F */
+ IGNORE, /* ^G */
+ IGNORE, /* ^H */
+ WHITE, /* ^I */
+ WHITE, /* ^J */
+ WHITE, /* ^K */
+ WHITE, /* ^L */
+ WHITE, /* ^M */
+ IGNORE, /* ^N */
+ IGNORE, /* ^O */
+ IGNORE, /* ^P */
+ IGNORE, /* ^Q */
+ IGNORE, /* ^R */
+ IGNORE, /* ^S */
+ IGNORE, /* ^T */
+ IGNORE, /* ^U */
+ IGNORE, /* ^V */
+ IGNORE, /* ^W */
+ IGNORE, /* ^X */
+ IGNORE, /* ^Y */
+ IGNORE, /* ^Z */
+ IGNORE, /* ^[ */
+ IGNORE, /* ^\ */
+ IGNORE, /* ^] */
+ IGNORE, /* ^^ */
+ IGNORE, /* ^_ */
+ PRINTABLE|WHITE, /* */
+ PRINTABLE, /* ! */
+ PRINTABLE|STRINGC, /* " */
+ PRINTABLE|COMMENT, /* # */
+ PRINTABLE, /* $ */
+ PRINTABLE, /* % */
+ PRINTABLE, /* & */
+ PRINTABLE|QUOTEC, /* ' */
+ PRINTABLE|BRA, /* ( */
+ PRINTABLE|KET, /* ) */
+ PRINTABLE, /* * */
+ PRINTABLE|SIGN, /* + */
+ PRINTABLE, /* , */
+ PRINTABLE|SIGN, /* - */
+ PRINTABLE, /* . */
+ PRINTABLE, /* / */
+ PRINTABLE|DIGIT, /* 0 */
+ PRINTABLE|DIGIT, /* 1 */
+ PRINTABLE|DIGIT, /* 2 */
+ PRINTABLE|DIGIT, /* 3 */
+ PRINTABLE|DIGIT, /* 4 */
+ PRINTABLE|DIGIT, /* 5 */
+ PRINTABLE|DIGIT, /* 6 */
+ PRINTABLE|DIGIT, /* 7 */
+ PRINTABLE|DIGIT, /* 8 */
+ PRINTABLE|DIGIT, /* 9 */
+ PRINTABLE, /* : */
+ PRINTABLE|COMMENT, /* ; */
+ PRINTABLE, /* < */
+ PRINTABLE, /* = */
+ PRINTABLE, /* > */
+ PRINTABLE, /* ? */
+ PRINTABLE, /* @ */
+ PRINTABLE, /* A */
+ PRINTABLE, /* B */
+ PRINTABLE, /* C */
+ PRINTABLE, /* D */
+ PRINTABLE, /* E */
+ PRINTABLE, /* F */
+ PRINTABLE, /* G */
+ PRINTABLE, /* H */
+ PRINTABLE, /* I */
+ PRINTABLE, /* J */
+ PRINTABLE, /* K */
+ PRINTABLE, /* L */
+ PRINTABLE, /* M */
+ PRINTABLE, /* N */
+ PRINTABLE, /* O */
+ PRINTABLE, /* P */
+ PRINTABLE, /* Q */
+ PRINTABLE, /* R */
+ PRINTABLE, /* S */
+ PRINTABLE, /* T */
+ PRINTABLE, /* U */
+ PRINTABLE, /* V */
+ PRINTABLE, /* W */
+ PRINTABLE, /* X */
+ PRINTABLE, /* Y */
+ PRINTABLE, /* Z */
+ PRINTABLE, /* [ */
+ PRINTABLE|BACKSLASH, /* \ */
+ PRINTABLE, /* ] */
+ PRINTABLE, /* ^ */
+ PRINTABLE, /* _ */
+ PRINTABLE, /* ` */
+ PRINTABLE, /* a */
+ PRINTABLE, /* b */
+ PRINTABLE, /* c */
+ PRINTABLE, /* d */
+ PRINTABLE, /* e */
+ PRINTABLE, /* f */
+ PRINTABLE, /* g */
+ PRINTABLE, /* h */
+ PRINTABLE, /* i */
+ PRINTABLE, /* j */
+ PRINTABLE, /* k */
+ PRINTABLE, /* l */
+ PRINTABLE, /* m */
+ PRINTABLE, /* n */
+ PRINTABLE, /* o */
+ PRINTABLE, /* p */
+ PRINTABLE, /* q */
+ PRINTABLE, /* r */
+ PRINTABLE, /* s */
+ PRINTABLE, /* t */
+ PRINTABLE, /* u */
+ PRINTABLE, /* v */
+ PRINTABLE, /* w */
+ PRINTABLE, /* x */
+ PRINTABLE, /* y */
+ PRINTABLE, /* z */
+ PRINTABLE, /* { */
+ PRINTABLE|VBAR, /* | */
+ PRINTABLE, /* } */
+ PRINTABLE|TWIDDLE, /* ~ */
+ IGNORE, /* ^? */
+};
+
+static int lex_unget_c;
+
+static inline int
+lex_get()
+{
+ int c;
+ if (lex_unget_c) {
+ c = lex_unget_c;
+ lex_unget_c = 0;
+ } else
+ c = getchar();
+ return c;
+}
+
+static inline void
+lex_unget(int c)
+{
+ if (c != EOF)
+ lex_unget_c = c;
+}
+
+static int
+lex_quoted (void)
+{
+ int c;
+ int v;
+ int count;
+
+ c = lex_get();
+// if (jumping)
+// return nil;
+ if (c == EOF)
+ return EOF;
+ c &= 0x7f;
+ switch (c) {
+ case 'n':
+ return '\n';
+ case 'f':
+ return '\f';
+ case 'b':
+ return '\b';
+ case 'r':
+ return '\r';
+ case 'v':
+ return '\v';
+ case 't':
+ return '\t';
+ case '0':
+ case '1':
+ case '2':
+ case '3':
+ case '4':
+ case '5':
+ case '6':
+ case '7':
+ v = c - '0';
+ count = 1;
+ while (count <= 3) {
+ c = lex_get();
+// if (jumping)
+// return nil;
+ if (c == EOF)
+ return EOF;
+ c &= 0x7f;
+ if (c < '0' || '7' < c) {
+ lex_unget(c);
+ break;
+ }
+ v = (v << 3) + c - '0';
+ ++count;
+ }
+ return v;
+ default:
+ return c;
+ }
+}
+
+static uint16_t lex_class;
+
+static int
+lexc(void)
+{
+ int c;
+ do {
+ c = lex_get();
+ if (c == EOF) {
+ lex_class = ENDOFFILE;
+ c = 0;
+ } else {
+ c &= 0x7f;
+ lex_class = lex_classes[c];
+ if (lex_class & BACKSLASH) {
+ c = lex_quoted();
+ if (c == EOF)
+ lex_class = ENDOFFILE;
+ else
+ lex_class = PRINTABLE;
+ }
+ }
+ } while (lex_class & IGNORE);
+ return c;
+}
+
+#define AO_LISP_TOKEN_MAX 32
+
+static char token_string[AO_LISP_TOKEN_MAX];
+static int token_int;
+static int token_len;
+
+static inline void add_token(int c) {
+ if (c && token_len < AO_LISP_TOKEN_MAX - 1)
+ token_string[token_len++] = c;
+}
+
+static inline void end_token(void) {
+ token_string[token_len] = '\0';
+}
+
+static int
+lex(void)
+{
+ int c;
+
+ token_len = 0;
+ for (;;) {
+ c = lexc();
+ if (lex_class & ENDOFFILE)
+ return AO_LISP_NIL;
+
+// if (jumping)
+// return nil;
+ if (lex_class & WHITE)
+ continue;
+
+ if (lex_class & (BRA|KET|QUOTEC)) {
+ add_token(c);
+ end_token();
+ switch (c) {
+ case '(':
+ return OPEN;
+ case ')':
+ return CLOSE;
+ case '\'':
+ return QUOTE;
+ }
+ }
+ if (lex_class & TWIDDLE) {
+ token_int = lexc();
+ return NUM;
+ }
+ if (lex_class & STRINGC) {
+ for (;;) {
+ c = lexc();
+// if (jumping)
+// return nil;
+ if (lex_class & (STRINGC|ENDOFFILE)) {
+ end_token();
+ return STRING;
+ }
+ add_token(c);
+ }
+ }
+ if (lex_class & PRINTABLE) {
+ int isnum;
+ int hasdigit;
+ int isneg;
+
+ isnum = 1;
+ hasdigit = 0;
+ token_int = 0;
+ isneg = 0;
+ for (;;) {
+ if (!(lex_class & NUMBER)) {
+ isnum = 0;
+ } else {
+ if (token_len != 0 &&
+ (lex_class & SIGN))
+ {
+ isnum = 0;
+ }
+ if (c == '-')
+ isneg = 1;
+ if (lex_class & DIGIT) {
+ hasdigit = 1;
+ if (isnum)
+ token_int = token_int * 10 + c - '0';
+ }
+ }
+ add_token (c);
+ c = lexc ();
+// if (jumping)
+// return nil;
+ if (lex_class & (NOTNAME)) {
+// if (lex_class & ENDOFFILE)
+// clearerr (f);
+ lex_unget(c);
+ end_token ();
+ if (isnum && hasdigit) {
+ if (isneg)
+ token_int = -token_int;
+ return NUM;
+ }
+ return NAME;
+ }
+ }
+
+ }
+ }
+}
+
+static int parse_token;
+static uint8_t been_here;
+static struct ao_lisp_cons *read_cons;
+static struct ao_lisp_cons *read_cons_tail;
+static struct ao_lisp_cons *read_stack;
+
+static ao_lisp_poly
+read_item(void)
+{
+ struct ao_lisp_atom *atom;
+ char *string;
+ int cons;
+ ao_lisp_poly v;
+
+ if (!been_here) {
+ ao_lisp_root_add(&ao_lisp_cons_type, &read_cons);
+ ao_lisp_root_add(&ao_lisp_cons_type, &read_cons_tail);
+ ao_lisp_root_add(&ao_lisp_cons_type, &read_stack);
+ }
+
+ cons = 0;
+ read_cons = read_cons_tail = read_stack = 0;
+ for (;;) {
+ while (parse_token == OPEN) {
+ if (cons++)
+ read_stack = ao_lisp_cons(ao_lisp_cons_poly(read_cons), read_stack);
+ read_cons = NULL;
+ read_cons_tail = NULL;
+ parse_token = lex();
+ }
+
+ switch (parse_token) {
+ case ENDOFFILE:
+ default:
+ v = AO_LISP_NIL;
+ break;
+ case NAME:
+ atom = ao_lisp_atom_intern(token_string);
+ if (atom)
+ v = ao_lisp_atom_poly(atom);
+ else
+ v = AO_LISP_NIL;
+ break;
+ case NUM:
+ v = ao_lisp_int_poly(token_int);
+ break;
+ case STRING:
+ string = ao_lisp_string_copy(token_string);
+ if (string)
+ v = ao_lisp_string_poly(string);
+ else
+ v = AO_LISP_NIL;
+ break;
+ case CLOSE:
+ if (cons)
+ v = ao_lisp_cons_poly(read_cons);
+ else
+ v = AO_LISP_NIL;
+ if (--cons) {
+ read_cons = ao_lisp_poly_cons(read_stack->car);
+ read_stack = read_stack->cdr;
+ for (read_cons_tail = read_cons;
+ read_cons_tail && read_cons_tail->cdr;
+ read_cons_tail = read_cons_tail->cdr)
+ ;
+ }
+ break;
+ }
+
+ if (!cons)
+ break;
+
+ struct ao_lisp_cons *read = ao_lisp_cons(v, NULL);
+ if (read_cons_tail)
+ read_cons_tail->cdr = read;
+ else
+ read_cons = read;
+ read_cons_tail = read;
+
+ parse_token = lex();
+ }
+ return v;
+}
+
+ao_lisp_poly
+ao_lisp_read(void)
+{
+ parse_token = lex();
+ return read_item();
+}
projects / fw / altos / blobdiff