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parser.c
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#include <wchar.h>
#include <ctype.h>
#include <stdlib.h>
#include <assert.h>
#include <global.h>
#include <string.h>
#include <sys/types.h>
#include "parser.h"
#include "error.h"
#include "global.h"
#include "cell.h"
#ifndef ishexnumber
#define ishexnumber(x) (((x>=L'0')&&(x<=L'9'))||((x>=L'a')&&(x<=L'f'))||((x>=L'A')&&(x<=L'F')))
#endif /* ishexnumber */
static Toy_Type* toy_parse_getmacro(Toy_Type *statement);
static Toy_Type* toy_parse_initmacro(Toy_Type *statement);
static Toy_Type* toy_parse_join_statement(Toy_Type *statement, int line);
static Toy_Type* toy_parse_setmacro(Toy_Type *statement, int line);
static Toy_Type* toy_parse_set_paramno(Toy_Type *statement);
Toy_Type*
toy_parse_start(Bulk *src) {
Toy_Type *script;
script = toy_parse_script(src, 0);
if (NULL == script) goto assert;
return script;
assert:
/* may be not enough memory */
return NULL;
}
Toy_Type*
toy_parse_script(Bulk *src, wchar_t endc) {
Toy_Type *script;
Toy_Type *statement;
Toy_Type *l;
int c;
wchar_t *buff;
Cell *msg;
int list_is_null = 1;
buff = GC_MALLOC(256*sizeof(wchar_t));
ALLOC_SAFE(buff);
script = new_script(NULL);
if (NULL == script) goto assert;
l = new_list(NULL);
script->u.statement_list = l;
c = bulk_getchar(src);
if ((c == EOF) && (endc != 0)) {
swprintf(buff, 256, L"Imbalanced close char '%lc' at line %d.",
endc, bulk_get_line(src));
msg = new_cell(buff);
return new_exception(TE_PARSECLOSE, cell_get_addr(msg), NULL);
}
// while (EOF != bulk_is_eof(src)) {
while (EOF != c) {
if (0 == endc) {
if (EOF == c) {
return script;
}
} else {
if (endc == c) {
return script;
}
if (EOF == c) {
swprintf(buff, 256, L"Imbalanced close char '%lc' at line %d.",
endc, bulk_get_line(src));
msg = new_cell(buff);
return new_exception(TE_PARSECLOSE, cell_get_addr(msg), NULL);
}
}
bulk_ungetchar(src);
statement = toy_parse_statement(src, endc);
if (statement == NULL) goto assert;
if (GET_TAG(statement) != STATEMENT) goto parse_error;
/* apply macros */
statement->u.statement_list =
toy_parse_getmacro(statement->u.statement_list);
statement->u.statement_list =
toy_parse_initmacro(statement->u.statement_list);
statement->u.statement_list =
toy_parse_setmacro(statement->u.statement_list, bulk_get_line(src));
statement->u.statement_list =
toy_parse_join_statement(statement->u.statement_list, bulk_get_line(src));
/* apply parameters number */
toy_parse_set_paramno(statement);
if (list_length(statement->u.statement_list) > 0) {
l = list_append(l, statement);
list_is_null = 0;
}
c = bulk_getchar(src);
}
if (endc == 0) return script;
if (list_is_null) return script;
swprintf(buff, 256, L"Imbalanced close char '%lc' at line %d.",
endc, bulk_get_line(src));
msg = new_cell(buff);
return new_exception(TE_PARSECLOSE, cell_get_addr(msg), NULL);
// return script;
parse_error:
return statement;
assert:
/* may be not enough memory */
return NULL;
}
Toy_Type*
toy_parse_statement(Bulk *src, wchar_t endc) {
wchar_t c, c_tmp;
Toy_Type *newstatement;
Toy_Type *any;
Toy_Type *l;
wchar_t *buff;
Cell *msg;
int line=0;
buff = GC_MALLOC(256*sizeof(wchar_t));
ALLOC_SAFE(buff);
l = new_list(NULL);
if (NULL == l) goto assert;
newstatement = new_statement(l, 0);
if (NULL == newstatement) goto assert;
while (EOF != (c = bulk_getchar(src))) {
if (endc == c) {
bulk_ungetchar(src);
if (line == 0) {
newstatement->u.statement.trace_info->line = bulk_get_line(src);
} else {
newstatement->u.statement.trace_info->line = line;
}
return newstatement;
}
if (L';' == c) {
if (line == 0) {
newstatement->u.statement.trace_info->line = bulk_get_line(src);
} else {
newstatement->u.statement.trace_info->line = line;
}
return newstatement;
}
switch (c) {
case L' ': case L'\t': case L'\r': case L'\n':
/* skip white space */
break;
case L'#':
/* skip comment */
c = bulk_getchar(src);
while (1) {
if (EOF == c) goto parse_end;
if (IS_NEWLINE(c)) break;
c = bulk_getchar(src);
}
bulk_ungetchar(src);
break;
case L')': case L'}': case L']':
swprintf(buff, 256, L"Illegal close char '%lc' at line %d.",
c, bulk_get_line(src));
msg = new_cell(buff);
any = new_exception(TE_PARSEBADCHAR, cell_get_addr(msg), NULL);
goto parse_error;
case L'(':
if (line == 0) {line = bulk_get_line(src);}
any = toy_parse_list(src, L')');
if (NULL == any) goto assert;
if (GET_TAG(any) != LIST) goto parse_error;
l = list_append(l, any);
break;
case L'{':
if (line == 0) {line = bulk_get_line(src);}
any = toy_parse_block(src, L'}');
if (NULL == any) goto assert;
if (GET_TAG(any) != BLOCK) goto parse_error;
l = list_append(l, any);
break;
case L'[':
if (line == 0) {line = bulk_get_line(src);}
any = toy_parse_eval(src, L']');
if (NULL == any) goto assert;
if (GET_TAG(any) != EVAL) goto parse_error;
l = list_append(l, any);
break;
case L'\"':
if (line == 0) {line = bulk_get_line(src);}
any = toy_parse_string(src, L'\"');
if (NULL == any) goto assert;
if (GET_TAG(any) != STRING) goto parse_error;
l = list_append(l, any);
break;
case L'\'':
if (line == 0) {line = bulk_get_line(src);}
any = toy_parse_rquote(src, L'\'');
if (NULL == any) goto assert;
if (GET_TAG(any) != RQUOTE) goto parse_error;
l = list_append(l, any);
break;
case L';':
if (line == 0) {line = bulk_get_line(src);}
if (line == 0) {
newstatement->u.statement.trace_info->line = bulk_get_line(src);
} else {
newstatement->u.statement.trace_info->line = line;
}
return newstatement;
case L',':
if (line == 0) {line = bulk_get_line(src);}
l = list_append(l, new_symbol(L","));
break;
case L'`':
if (line == 0) {line = bulk_get_line(src);}
l = list_append(l, new_symbol(L"`"));
break;
case L'|':
if (line == 0) {line = bulk_get_line(src);}
c_tmp = bulk_getchar(src);
if (wcschr(ENDCHAR, c_tmp) != NULL) {
any = toy_parse_list(src, L'|');
if (GET_TAG(any) != LIST) goto parse_error;
l = list_append(l, new_bind(any));
if (line == 0) {
newstatement->u.statement.trace_info->line = bulk_get_line(src);
} else {
newstatement->u.statement.trace_info->line = line;
}
return newstatement;
}
bulk_ungetchar(src);
/* FALL THRU */
default:
if (line == 0) {line = bulk_get_line(src);}
/* parse symbol */
bulk_ungetchar(src);
any = toy_parse_symbol(src, ENDCHAR);
if (NULL == any) goto assert;
if (GET_TAG(any) != SYMBOL) goto parse_error;
l = list_append(l, toy_symbol_conv(any));
}
}
parse_end:
if (line == 0) {
newstatement->u.statement.trace_info->line = bulk_get_line(src);
} else {
newstatement->u.statement.trace_info->line = line;
}
if (0 == endc) {
return newstatement;
} else {
swprintf(buff, 256, L"Imbalanced close char '%lc' at line %d.",
endc, bulk_get_line(src));
msg = new_cell(buff);
return new_exception(TE_PARSECLOSE, cell_get_addr(msg), NULL);
}
parse_error:
/* parse error */
return any;
assert:
/* may be not enough memory */
return NULL;
}
Toy_Type*
toy_parse_symbol(Bulk *src, wchar_t *endc) {
Toy_Type *symbol;
Cell *newcell;
int c;
wchar_t buff[2];
newcell = new_cell(L"");
if (NULL == newcell) goto assert;
c = bulk_getchar(src);
while (1) {
if (EOF == c) {
goto complite;
}
buff[0] = c; buff[1] = 0;
if (NULL != wcsstr((const wchar_t*)endc, (const wchar_t*)buff)) {
bulk_ungetchar(src);
goto complite;
}
if (NULL == cell_add_char(newcell, c)) goto assert;
c = bulk_getchar(src);
}
complite:
symbol = new_symbol(cell_get_addr(newcell));
return symbol;
assert:
return NULL;
}
Toy_Type*
toy_parse_string(Bulk *src, wchar_t endc) {
Toy_Type *str;
Cell *newcell;
int c;
Cell *msg;
wchar_t *buff;
buff = GC_MALLOC(256*sizeof(wchar_t));
ALLOC_SAFE(buff);
str = new_string_str(L"");
if (NULL == str) goto assert;
newcell = str->u.string;
c = bulk_getchar(src);
while (endc != c) {
if (EOF == c) goto parse_error;
if (L'\\' == c) {
c = bulk_getchar(src);
if (EOF == c) goto parse_error;
switch (c) {
case L't':
c = L'\t';
break;
case L'r':
c = L'\r';
break;
case L'n':
c = L'\n';
break;
case L'\n': case L'\r':
c = 0;
break;
}
}
if (0 != c) {
if (NULL == cell_add_char(newcell, c)) goto assert;
}
c = bulk_getchar(src);
}
return str;
assert:
return NULL;
parse_error:
swprintf(buff, 256, L"Imbalanced close string '%lc' at line %d.",
endc, bulk_get_line(src));
msg = new_cell(buff);
return new_exception(TE_PARSESTRING, cell_get_addr(msg), NULL);
}
Toy_Type*
toy_parse_rquote(Bulk *src, wchar_t endc) {
Toy_Type *str;
Cell *newcell;
int c;
Cell *msg;
wchar_t *buff;
buff = GC_MALLOC(256*sizeof(wchar_t));
ALLOC_SAFE(buff);
str = new_rquote(L"");
if (NULL == str) goto assert;
newcell = str->u.rquote;
c = bulk_getchar(src);
while (endc != c) {
if (EOF == c) goto parse_error;
if (L'\\' == c) {
c = bulk_getchar(src);
if (EOF == c) goto parse_error;
switch (c) {
case L't':
c = L'\t';
break;
case L'r':
c = L'\r';
break;
case L'n':
c = L'\n';
break;
case L'\\':
c = L'\\';
break;
case L'\'':
c = L'\'';
break;
case L'\n': case L'\r':
c = 0;
break;
default:
bulk_ungetchar(src);
c = L'\\';
}
}
if (0 != c) {
if (NULL == cell_add_char(newcell, c)) goto assert;
}
c = bulk_getchar(src);
}
return str;
assert:
return NULL;
parse_error:
swprintf(buff, 256, L"Imbalanced close rquote '%lc' at line %d.",
endc, bulk_get_line(src));
msg = new_cell(buff);
return new_exception(TE_PARSESTRING, cell_get_addr(msg), NULL);
}
Toy_Type*
toy_parse_list(Bulk *src, wchar_t endc) {
wchar_t c;
Toy_Type *newlist;
Toy_Type *any;
Toy_Type *l;
wchar_t *buff;
Cell *msg;
buff = GC_MALLOC(256*sizeof(wchar_t));
ALLOC_SAFE(buff);
newlist = new_list(NULL);
if (NULL == newlist) goto assert;
l = newlist;
while (EOF != (c = bulk_getchar(src))) {
if (endc == c) return newlist;
switch (c) {
case L' ': case L'\t': case L'\r': case L';': case L'\n':
/* skip white space */
break;
case L'#':
/* skip comment */
c = bulk_getchar(src);
while (1) {
if (EOF == c) goto parse_end;
if (L'\n' == c) break;
c = bulk_getchar(src);
}
bulk_ungetchar(src);
break;
case L')': case L'}': case L']':
swprintf(buff, 256, L"Illegal close list char '%lc' at line %d.",
c, bulk_get_line(src));
msg = new_cell(buff);
any = new_exception(TE_PARSEBADCHAR, cell_get_addr(msg), NULL);
goto parse_error;
case L'(':
any = toy_parse_list(src, L')');
if (NULL == any) goto assert;
if (GET_TAG(any) != LIST) goto parse_error;
l = list_append(l, any);
break;
case L'{':
any = toy_parse_block(src, L'}');
if (NULL == any) goto assert;
if (GET_TAG(any) != BLOCK) goto parse_error;
l = list_append(l, any);
break;
case L'[':
any = toy_parse_eval(src, L']');
if (NULL == any) goto assert;
if (GET_TAG(any) != EVAL) goto parse_error;
l = list_append(l, any);
break;
case L'\"':
any = toy_parse_string(src, L'\"');
if (NULL == any) goto assert;
if (GET_TAG(any) != STRING) goto parse_error;
l = list_append(l, any);
break;
case L'\'':
any = toy_parse_rquote(src, L'\'');
if (NULL == any) goto assert;
if (GET_TAG(any) != RQUOTE) goto parse_error;
l = list_append(l, any);
break;
case L',':
l = list_append(l, new_symbol(L","));
break;
case L'`':
l = list_append(l, new_symbol(L"`"));
break;
default:
/* parse symbol */
bulk_ungetchar(src);
any = toy_parse_symbol(src, ENDCHAR);
if (NULL == any) goto assert;
if (GET_TAG(any) != SYMBOL) goto parse_error;
if (wcscmp(cell_get_addr(any->u.symbol.cell), L".") == 0) {
any = toy_parse_list(src, L')');
if (NULL == any) goto assert;
list_set_cdr(l, toy_symbol_conv(list_get_item(any)));
if (NULL == list_get_item(l)) list_set_car(l, new_bool(FALSE));
bulk_ungetchar(src);
} else {
l = list_append(l, toy_symbol_conv(any));
}
}
}
parse_end:
swprintf(buff, 256, L"Imbalanced close list char '%lc' at line %d.",
endc, bulk_get_line(src));
msg = new_cell(buff);
return new_exception(TE_PARSECLOSE, cell_get_addr(msg), NULL);
parse_error:
/* parse error */
return any;
assert:
/* may be not enough memory */
return NULL;
}
Toy_Type*
toy_parse_block(Bulk *src, wchar_t endc) {
Toy_Type *script;
Toy_Type *newblock;
script = toy_parse_script(src, L'}');
if (NULL == script) goto assert;
if (GET_TAG(script) != SCRIPT) return script;
newblock = new_block(script);
if (NULL == newblock) goto assert;
return newblock;
assert:
return NULL;
}
Toy_Type*
toy_parse_eval(Bulk* src, wchar_t endc) {
Toy_Type *script;
Toy_Type *neweval;
script = toy_parse_script(src, L']');
if (NULL == script) goto assert;
if (GET_TAG(script) != SCRIPT) return script;
neweval = new_eval(script);
if (NULL == neweval) goto assert;
return neweval;
assert:
return NULL;
}
Toy_Type*
toy_symbol_conv(Toy_Type *a) {
wchar_t *addr, *p;
mpz_t s;
if (NULL == a) return new_bool(FALSE);
if (GET_TAG(a) != SYMBOL) return a;
addr = cell_get_addr(a->u.symbol.cell);
if (wcscmp(addr, S_NIL) == 0) {
return new_bool(FALSE);
}
if (wcscmp(addr, S_T) == 0) {
return new_bool(TRUE);
}
if (wcscmp(addr, L".") == 0) {
return a;
}
if (wcscmp(addr, L"..") == 0) {
return a;
}
if (wcscmp(addr, L"-") == 0) {
return a;
}
if (addr[0] == L'$') {
return new_ref(&addr[1]);
}
/* is integer ? */
p = cell_get_addr(a->u.symbol.cell);
if (! ((p[0] == L'-') || (isdigit(p[0])))) goto non_integer;
if (p[0] == L'-') p++;
while (*p) {
if (! isdigit(*p)) goto non_integer;
p++;
}
mpz_init(s);
mpz_set_str(s, to_char(cell_get_addr(a->u.symbol.cell)), 10);
return new_integer(s);
non_integer:
/* is real ? */
p = cell_get_addr(a->u.symbol.cell);
if (! ((p[0] == L'-') || (p[0] == L'.') || (isdigit(p[0]))))
return a;
if ((p[0] == L'-') || (p[0] == L'.')) p++;
while (isdigit(*p)) {
p++;
}
if (*p == L'.') {
p++;
while (isdigit(*p)) {
p++;
}
}
if ((*p == L'E') || (*p == L'e')) {
p++;
if ((*p == L'+') || (*p == L'-') || isdigit(*p)) {
p++;
while (*p) {
if (! isdigit(*p)) goto non_real;
p++;
}
return new_real(wcstod(cell_get_addr(a->u.symbol.cell), NULL));
}
} else if (*p == 0) {
return new_real(wcstod(cell_get_addr(a->u.symbol.cell), NULL));
}
non_real:
/* is hex decimal ? */
p = cell_get_addr(a->u.symbol.cell);
if (wcslen((const wchar_t*)p) < 3) goto non_hex;
if ((p[0] == L'0') && ((p[1] == L'x') || (p[1] == L'X'))) {
p++; p++;
while (*p) {
if (! ishexnumber(*p)) goto non_hex;
p++;
}
mpz_init(s);
mpz_set_str(s, to_char(&(cell_get_addr(a->u.symbol.cell)[2])), 16);
return new_integer(s);
}
non_hex:
/* is octal ? */
p = cell_get_addr(a->u.symbol.cell);
if (wcslen((const wchar_t*)p) < 3) goto non_octal;
if ((p[0] == L'0') && ((p[1] == L'o') || (p[1] == L'O'))) {
p++; p++;
while (*p) {
if ((*p < '0') || (*p > '7')) goto non_octal;
p++;
}
mpz_init(s);
mpz_set_str(s, to_char(&(cell_get_addr(a->u.symbol.cell)[2])), 8);
return new_integer(s);
}
non_octal:
return a;
}
/** for debug **/
int print_script(Toy_Type *script, int indent);
int print_statement(Toy_Type *st, int indent);
int print_indent(int indent);
int print_object(Toy_Type *obj, int indent);
int print_list(Toy_Type *l, int indent);
void parser_debug_dump(Toy_Type *script) {
int indent = 0;
print_script(script, indent);
}
int
print_script(Toy_Type *script, int indent) {
Toy_Type *l, *st;
l = script->u.statement_list;
do {
st = list_get_item(l);
print_statement(st, indent);
l = list_next(l);
} while (l);
return 0;
}
int print_statement(Toy_Type *st, int indent) {
Toy_Type *item;
print_indent(indent);
if (NULL == st) {
wprintf(L"statement is nil.\n");
return 0;
}
wprintf(L"--- statement, line=%d\n", st->u.statement.trace_info->line);
item = st->u.statement.item_list;
do {
print_object(list_get_item(item), indent);
item = list_next(item);
} while (item);
return 0;
}
int print_indent(int indent) {
int i;
for (i=0; i<(indent*4); i++) {
putchar(L' ');
}
return 1;
}
int print_object(Toy_Type *obj, int indent) {
Cell *ocell;
Toy_Type *olist;
Toy_Type *script;
print_indent(indent);
if (! IS_TOY_OBJECT(obj)) {
wprintf(L"not a toy object\n");
return 0;
}
wprintf(L"type=%ls: ", toy_get_type_str(obj));
switch GET_TAG(obj) {
case BOOL:
if (obj->u.tbool.value == FALSE) {
wprintf(L"nil\n");
} else {
wprintf(L"t\n");
}
break;
case SYMBOL:
ocell = obj->u.symbol.cell;
wprintf(L"%ls\n", cell_get_addr(ocell));
break;
case REF:
ocell = obj->u.ref.cell;
wprintf(L"%ls\n", cell_get_addr(ocell));
break;
case INTEGER:
wprintf(L"%ls\n", to_string(obj));
break;
case REAL:
wprintf(L"%ls\n", to_string(obj));
break;
case STRING:
ocell = obj->u.string;
wprintf(L"\"%ls\"\n", cell_get_addr(ocell));
break;
case STATEMENT:
wprintf(L"not yet\n");
break;
case SCRIPT:
wprintf(L"not yet\n");
break;
case LIST:
wprintf(L"\n");
olist = obj;
indent++;
print_list(olist, indent);
break;
case BLOCK:
wprintf(L"\n");
script = obj->u.block_body;
indent++;
print_script(script, indent);
break;
case EVAL:
wprintf(L"\n");
script = obj->u.eval_body;
indent++;
print_script(script, indent);
break;
case NATIVE:
case CLOSURE:
case EXCEPTION:
case FUNC:
case OBJECT:
break;
default:
assert(0);
}
return 1;
}
int
print_list(Toy_Type *l, int indent) {
if (IS_LIST_NULL(l)) {
print_indent(indent);
wprintf(L"nil.\n");
return 1;
}
while (l) {
print_object(list_get_item(l), indent);
l = list_next(l);
if (l && (GET_TAG(l) != LIST)) {
print_object(l, indent);
break;
}
}
return 1;
}
/** end debug **/
static Toy_Type*
toy_parse_getmacro(Toy_Type *statement) {
Toy_Type *l, *result, *cur, *prev;
result = l = new_list(NULL);
cur = NULL; prev = NULL;
while (statement) {
cur = list_get_item(statement);
if ((GET_TAG(cur) == SYMBOL) &&
wcscmp(cell_get_addr(cur->u.symbol.cell), L",") == 0) {
if (prev != NULL) {
statement = list_next(statement);
if (IS_LIST_NULL(statement)) {
l = list_append(l, cur);
} else {
cur = list_get_item(statement);
list_set_car(l, new_getmacro(prev, cur));
}
} else {
l = list_append(l, cur);
}
} else {
if (GET_TAG(cur) == LIST) {
l = list_append(l, toy_parse_getmacro(cur));
} else {
l = list_append(l, cur);
}
}
statement = list_next(statement);
if (GET_TAG(statement) != LIST) {
list_set_cdr(l, statement);
break;
}
prev = cur;
}
return result;
}
static Toy_Type*
toy_parse_initmacro(Toy_Type *statement) {
Toy_Type *l, *result, *cur, *class, *param;
result = l = new_list(NULL);
while (statement) {
cur = list_get_item(statement);
if ((GET_TAG(cur) == SYMBOL) &&
wcscmp(cell_get_addr(cur->u.symbol.cell), L"`") == 0) {
if (list_length(statement) >= 2) {
statement = list_next(statement);
class = list_get_item(statement);
statement = list_next(statement);
param = list_get_item(statement);
l = list_append(l, new_initmacro(class, param));
} else {
l = list_append(l, cur);
}
} else {
l = list_append(l, cur);
}
statement = list_next(statement);
}
return result;
}
static Toy_Type*
toy_parse_join_statement(Toy_Type *statement, int line) {
Toy_Type *result, *src, *cur;
result = new_list(NULL);
src = new_list(NULL);
while (statement) {
cur = list_get_item(statement);
if ((GET_TAG(cur) == SYMBOL) &&
wcscmp(cell_get_addr(cur->u.symbol.cell), L"\\") == 0) {
if (IS_LIST_NULL(result)) {
result = src;