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eBookReaderSwitch/mupdf/thirdparty/mujs/jsparse.c

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Squashed 'mupdf/' content from commit 340abaf66 git-subtree-dir: mupdf git-subtree-split: 340abaf66f43a04477866e5df8ba9726709f43f4
2019-10-30 16:48:08 +00:00
#include "jsi.h"
#include "jslex.h"
#include "jsparse.h"
#define LIST(h) jsP_newnode(J, AST_LIST, 0, h, 0, 0, 0)
#define EXP0(x) jsP_newnode(J, EXP_ ## x, line, 0, 0, 0, 0)
#define EXP1(x,a) jsP_newnode(J, EXP_ ## x, line, a, 0, 0, 0)
#define EXP2(x,a,b) jsP_newnode(J, EXP_ ## x, line, a, b, 0, 0)
#define EXP3(x,a,b,c) jsP_newnode(J, EXP_ ## x, line, a, b, c, 0)
#define STM0(x) jsP_newnode(J, STM_ ## x, line, 0, 0, 0, 0)
#define STM1(x,a) jsP_newnode(J, STM_ ## x, line, a, 0, 0, 0)
#define STM2(x,a,b) jsP_newnode(J, STM_ ## x, line, a, b, 0, 0)
#define STM3(x,a,b,c) jsP_newnode(J, STM_ ## x, line, a, b, c, 0)
#define STM4(x,a,b,c,d) jsP_newnode(J, STM_ ## x, line, a, b, c, d)
static js_Ast *expression(js_State *J, int notin);
static js_Ast *assignment(js_State *J, int notin);
static js_Ast *memberexp(js_State *J);
static js_Ast *statement(js_State *J);
static js_Ast *funbody(js_State *J);
JS_NORETURN static void jsP_error(js_State *J, const char *fmt, ...) JS_PRINTFLIKE(2,3);
#define INCREC() if (++J->astdepth > JS_ASTLIMIT) jsP_error(J, "too much recursion")
#define DECREC() --J->astdepth
#define SAVEREC() int SAVE=J->astdepth
#define POPREC() J->astdepth=SAVE
static void jsP_error(js_State *J, const char *fmt, ...)
{
va_list ap;
char buf[512];
char msgbuf[256];
va_start(ap, fmt);
vsnprintf(msgbuf, 256, fmt, ap);
va_end(ap);
snprintf(buf, 256, "%s:%d: ", J->filename, J->lexline);
strcat(buf, msgbuf);
js_newsyntaxerror(J, buf);
js_throw(J);
}
static void jsP_warning(js_State *J, const char *fmt, ...)
{
va_list ap;
char buf[512];
char msg[256];
va_start(ap, fmt);
vsnprintf(msg, sizeof msg, fmt, ap);
va_end(ap);
snprintf(buf, sizeof buf, "%s:%d: warning: %s", J->filename, J->lexline, msg);
js_report(J, buf);
}
static js_Ast *jsP_newnode(js_State *J, enum js_AstType type, int line, js_Ast *a, js_Ast *b, js_Ast *c, js_Ast *d)
{
js_Ast *node = js_malloc(J, sizeof *node);
node->type = type;
node->line = line;
node->a = a;
node->b = b;
node->c = c;
node->d = d;
node->number = 0;
node->string = NULL;
node->jumps = NULL;
node->casejump = 0;
node->parent = NULL;
if (a) a->parent = node;
if (b) b->parent = node;
if (c) c->parent = node;
if (d) d->parent = node;
node->gcnext = J->gcast;
J->gcast = node;
return node;
}
static js_Ast *jsP_list(js_Ast *head)
{
/* set parent pointers in list nodes */
js_Ast *prev = head, *node = head->b;
while (node) {
node->parent = prev;
prev = node;
node = node->b;
}
return head;
}
static js_Ast *jsP_newstrnode(js_State *J, enum js_AstType type, const char *s)
{
js_Ast *node = jsP_newnode(J, type, J->lexline, 0, 0, 0, 0);
node->string = s;
return node;
}
static js_Ast *jsP_newnumnode(js_State *J, enum js_AstType type, double n)
{
js_Ast *node = jsP_newnode(J, type, J->lexline, 0, 0, 0, 0);
node->number = n;
return node;
}
static void jsP_freejumps(js_State *J, js_JumpList *node)
{
while (node) {
js_JumpList *next = node->next;
js_free(J, node);
node = next;
}
}
void jsP_freeparse(js_State *J)
{
js_Ast *node = J->gcast;
while (node) {
js_Ast *next = node->gcnext;
jsP_freejumps(J, node->jumps);
js_free(J, node);
node = next;
}
J->gcast = NULL;
}
/* Lookahead */
static void jsP_next(js_State *J)
{
J->lookahead = jsY_lex(J);
}
#define jsP_accept(J,x) (J->lookahead == x ? (jsP_next(J), 1) : 0)
#define jsP_expect(J,x) if (!jsP_accept(J, x)) jsP_error(J, "unexpected token: %s (expected %s)", jsY_tokenstring(J->lookahead), jsY_tokenstring(x))
static void semicolon(js_State *J)
{
if (J->lookahead == ';') {
jsP_next(J);
return;
}
if (J->newline || J->lookahead == '}' || J->lookahead == 0)
return;
jsP_error(J, "unexpected token: %s (expected ';')", jsY_tokenstring(J->lookahead));
}
/* Literals */
static js_Ast *identifier(js_State *J)
{
js_Ast *a;
if (J->lookahead == TK_IDENTIFIER) {
a = jsP_newstrnode(J, AST_IDENTIFIER, J->text);
jsP_next(J);
return a;
}
jsP_error(J, "unexpected token: %s (expected identifier)", jsY_tokenstring(J->lookahead));
}
static js_Ast *identifieropt(js_State *J)
{
if (J->lookahead == TK_IDENTIFIER)
return identifier(J);
return NULL;
}
static js_Ast *identifiername(js_State *J)
{
if (J->lookahead == TK_IDENTIFIER || J->lookahead >= TK_BREAK) {
js_Ast *a = jsP_newstrnode(J, AST_IDENTIFIER, J->text);
jsP_next(J);
return a;
}
jsP_error(J, "unexpected token: %s (expected identifier or keyword)", jsY_tokenstring(J->lookahead));
}
static js_Ast *arrayelement(js_State *J)
{
int line = J->lexline;
if (J->lookahead == ',')
return EXP0(UNDEF);
return assignment(J, 0);
}
static js_Ast *arrayliteral(js_State *J)
{
js_Ast *head, *tail;
if (J->lookahead == ']')
return NULL;
head = tail = LIST(arrayelement(J));
while (jsP_accept(J, ',')) {
if (J->lookahead != ']')
tail = tail->b = LIST(arrayelement(J));
}
return jsP_list(head);
}
static js_Ast *propname(js_State *J)
{
js_Ast *name;
if (J->lookahead == TK_NUMBER) {
name = jsP_newnumnode(J, EXP_NUMBER, J->number);
jsP_next(J);
} else if (J->lookahead == TK_STRING) {
name = jsP_newstrnode(J, EXP_STRING, J->text);
jsP_next(J);
} else {
name = identifiername(J);
}
return name;
}
static js_Ast *propassign(js_State *J)
{
js_Ast *name, *value, *arg, *body;
int line = J->lexline;
name = propname(J);
if (J->lookahead != ':' && name->type == AST_IDENTIFIER) {
if (!strcmp(name->string, "get")) {
name = propname(J);
jsP_expect(J, '(');
jsP_expect(J, ')');
body = funbody(J);
return EXP3(PROP_GET, name, NULL, body);
}
if (!strcmp(name->string, "set")) {
name = propname(J);
jsP_expect(J, '(');
arg = identifier(J);
jsP_expect(J, ')');
body = funbody(J);
return EXP3(PROP_SET, name, LIST(arg), body);
}
}
jsP_expect(J, ':');
value = assignment(J, 0);
return EXP2(PROP_VAL, name, value);
}
static js_Ast *objectliteral(js_State *J)
{
js_Ast *head, *tail;
if (J->lookahead == '}')
return NULL;
head = tail = LIST(propassign(J));
while (jsP_accept(J, ',')) {
if (J->lookahead == '}')
break;
tail = tail->b = LIST(propassign(J));
}
return jsP_list(head);
}
/* Functions */
static js_Ast *parameters(js_State *J)
{
js_Ast *head, *tail;
if (J->lookahead == ')')
return NULL;
head = tail = LIST(identifier(J));
while (jsP_accept(J, ',')) {
tail = tail->b = LIST(identifier(J));
}
return jsP_list(head);
}
static js_Ast *fundec(js_State *J, int line)
{
js_Ast *a, *b, *c;
a = identifier(J);
jsP_expect(J, '(');
b = parameters(J);
jsP_expect(J, ')');
c = funbody(J);
return jsP_newnode(J, AST_FUNDEC, line, a, b, c, 0);
}
static js_Ast *funstm(js_State *J, int line)
{
js_Ast *a, *b, *c;
a = identifier(J);
jsP_expect(J, '(');
b = parameters(J);
jsP_expect(J, ')');
c = funbody(J);
/* rewrite function statement as "var X = function X() {}" */
return STM1(VAR, LIST(EXP2(VAR, a, EXP3(FUN, a, b, c))));
}
static js_Ast *funexp(js_State *J, int line)
{
js_Ast *a, *b, *c;
a = identifieropt(J);
jsP_expect(J, '(');
b = parameters(J);
jsP_expect(J, ')');
c = funbody(J);
return EXP3(FUN, a, b, c);
}
/* Expressions */
static js_Ast *primary(js_State *J)
{
js_Ast *a;
int line = J->lexline;
if (J->lookahead == TK_IDENTIFIER) {
a = jsP_newstrnode(J, EXP_IDENTIFIER, J->text);
jsP_next(J);
return a;
}
if (J->lookahead == TK_STRING) {
a = jsP_newstrnode(J, EXP_STRING, J->text);
jsP_next(J);
return a;
}
if (J->lookahead == TK_REGEXP) {
a = jsP_newstrnode(J, EXP_REGEXP, J->text);
a->number = J->number;
jsP_next(J);
return a;
}
if (J->lookahead == TK_NUMBER) {
a = jsP_newnumnode(J, EXP_NUMBER, J->number);
jsP_next(J);
return a;
}
if (jsP_accept(J, TK_THIS)) return EXP0(THIS);
if (jsP_accept(J, TK_NULL)) return EXP0(NULL);
if (jsP_accept(J, TK_TRUE)) return EXP0(TRUE);
if (jsP_accept(J, TK_FALSE)) return EXP0(FALSE);
if (jsP_accept(J, '{')) {
a = EXP1(OBJECT, objectliteral(J));
jsP_expect(J, '}');
return a;
}
if (jsP_accept(J, '[')) {
a = EXP1(ARRAY, arrayliteral(J));
jsP_expect(J, ']');
return a;
}
if (jsP_accept(J, '(')) {
a = expression(J, 0);
jsP_expect(J, ')');
return a;
}
jsP_error(J, "unexpected token in expression: %s", jsY_tokenstring(J->lookahead));
}
static js_Ast *arguments(js_State *J)
{
js_Ast *head, *tail;
if (J->lookahead == ')')
return NULL;
head = tail = LIST(assignment(J, 0));
while (jsP_accept(J, ',')) {
tail = tail->b = LIST(assignment(J, 0));
}
return jsP_list(head);
}
static js_Ast *newexp(js_State *J)
{
js_Ast *a, *b;
int line = J->lexline;
if (jsP_accept(J, TK_NEW)) {
a = memberexp(J);
if (jsP_accept(J, '(')) {
b = arguments(J);
jsP_expect(J, ')');
return EXP2(NEW, a, b);
}
return EXP1(NEW, a);
}
if (jsP_accept(J, TK_FUNCTION))
return funexp(J, line);
return primary(J);
}
static js_Ast *memberexp(js_State *J)
{
js_Ast *a = newexp(J);
int line;
SAVEREC();
loop:
INCREC();
line = J->lexline;
if (jsP_accept(J, '.')) { a = EXP2(MEMBER, a, identifiername(J)); goto loop; }
if (jsP_accept(J, '[')) { a = EXP2(INDEX, a, expression(J, 0)); jsP_expect(J, ']'); goto loop; }
POPREC();
return a;
}
static js_Ast *callexp(js_State *J)
{
js_Ast *a = newexp(J);
int line;
SAVEREC();
loop:
INCREC();
line = J->lexline;
if (jsP_accept(J, '.')) { a = EXP2(MEMBER, a, identifiername(J)); goto loop; }
if (jsP_accept(J, '[')) { a = EXP2(INDEX, a, expression(J, 0)); jsP_expect(J, ']'); goto loop; }
if (jsP_accept(J, '(')) { a = EXP2(CALL, a, arguments(J)); jsP_expect(J, ')'); goto loop; }
POPREC();
return a;
}
static js_Ast *postfix(js_State *J)
{
js_Ast *a = callexp(J);
int line = J->lexline;
if (!J->newline && jsP_accept(J, TK_INC)) return EXP1(POSTINC, a);
if (!J->newline && jsP_accept(J, TK_DEC)) return EXP1(POSTDEC, a);
return a;
}
static js_Ast *unary(js_State *J)
{
js_Ast *a;
int line = J->lexline;
INCREC();
if (jsP_accept(J, TK_DELETE)) a = EXP1(DELETE, unary(J));
else if (jsP_accept(J, TK_VOID)) a = EXP1(VOID, unary(J));
else if (jsP_accept(J, TK_TYPEOF)) a = EXP1(TYPEOF, unary(J));
else if (jsP_accept(J, TK_INC)) a = EXP1(PREINC, unary(J));
else if (jsP_accept(J, TK_DEC)) a = EXP1(PREDEC, unary(J));
else if (jsP_accept(J, '+')) a = EXP1(POS, unary(J));
else if (jsP_accept(J, '-')) a = EXP1(NEG, unary(J));
else if (jsP_accept(J, '~')) a = EXP1(BITNOT, unary(J));
else if (jsP_accept(J, '!')) a = EXP1(LOGNOT, unary(J));
else a = postfix(J);
DECREC();
return a;
}
static js_Ast *multiplicative(js_State *J)
{
js_Ast *a = unary(J);
int line;
SAVEREC();
loop:
INCREC();
line = J->lexline;
if (jsP_accept(J, '*')) { a = EXP2(MUL, a, unary(J)); goto loop; }
if (jsP_accept(J, '/')) { a = EXP2(DIV, a, unary(J)); goto loop; }
if (jsP_accept(J, '%')) { a = EXP2(MOD, a, unary(J)); goto loop; }
POPREC();
return a;
}
static js_Ast *additive(js_State *J)
{
js_Ast *a = multiplicative(J);
int line;
SAVEREC();
loop:
INCREC();
line = J->lexline;
if (jsP_accept(J, '+')) { a = EXP2(ADD, a, multiplicative(J)); goto loop; }
if (jsP_accept(J, '-')) { a = EXP2(SUB, a, multiplicative(J)); goto loop; }
POPREC();
return a;
}
static js_Ast *shift(js_State *J)
{
js_Ast *a = additive(J);
int line;
SAVEREC();
loop:
INCREC();
line = J->lexline;
if (jsP_accept(J, TK_SHL)) { a = EXP2(SHL, a, additive(J)); goto loop; }
if (jsP_accept(J, TK_SHR)) { a = EXP2(SHR, a, additive(J)); goto loop; }
if (jsP_accept(J, TK_USHR)) { a = EXP2(USHR, a, additive(J)); goto loop; }
POPREC();
return a;
}
static js_Ast *relational(js_State *J, int notin)
{
js_Ast *a = shift(J);
int line;
SAVEREC();
loop:
INCREC();
line = J->lexline;
if (jsP_accept(J, '<')) { a = EXP2(LT, a, shift(J)); goto loop; }
if (jsP_accept(J, '>')) { a = EXP2(GT, a, shift(J)); goto loop; }
if (jsP_accept(J, TK_LE)) { a = EXP2(LE, a, shift(J)); goto loop; }
if (jsP_accept(J, TK_GE)) { a = EXP2(GE, a, shift(J)); goto loop; }
if (jsP_accept(J, TK_INSTANCEOF)) { a = EXP2(INSTANCEOF, a, shift(J)); goto loop; }
if (!notin && jsP_accept(J, TK_IN)) { a = EXP2(IN, a, shift(J)); goto loop; }
POPREC();
return a;
}
static js_Ast *equality(js_State *J, int notin)
{
js_Ast *a = relational(J, notin);
int line;
SAVEREC();
loop:
INCREC();
line = J->lexline;
if (jsP_accept(J, TK_EQ)) { a = EXP2(EQ, a, relational(J, notin)); goto loop; }
if (jsP_accept(J, TK_NE)) { a = EXP2(NE, a, relational(J, notin)); goto loop; }
if (jsP_accept(J, TK_STRICTEQ)) { a = EXP2(STRICTEQ, a, relational(J, notin)); goto loop; }
if (jsP_accept(J, TK_STRICTNE)) { a = EXP2(STRICTNE, a, relational(J, notin)); goto loop; }
POPREC();
return a;
}
static js_Ast *bitand(js_State *J, int notin)
{
js_Ast *a = equality(J, notin);
SAVEREC();
int line = J->lexline;
while (jsP_accept(J, '&')) {
INCREC();
a = EXP2(BITAND, a, equality(J, notin));
line = J->lexline;
}
POPREC();
return a;
}
static js_Ast *bitxor(js_State *J, int notin)
{
js_Ast *a = bitand(J, notin);
SAVEREC();
int line = J->lexline;
while (jsP_accept(J, '^')) {
INCREC();
a = EXP2(BITXOR, a, bitand(J, notin));
line = J->lexline;
}
POPREC();
return a;
}
static js_Ast *bitor(js_State *J, int notin)
{
js_Ast *a = bitxor(J, notin);
SAVEREC();
int line = J->lexline;
while (jsP_accept(J, '|')) {
INCREC();
a = EXP2(BITOR, a, bitxor(J, notin));
line = J->lexline;
}
POPREC();
return a;
}
static js_Ast *logand(js_State *J, int notin)
{
js_Ast *a = bitor(J, notin);
int line = J->lexline;
if (jsP_accept(J, TK_AND)) {
INCREC();
a = EXP2(LOGAND, a, logand(J, notin));
DECREC();
}
return a;
}
static js_Ast *logor(js_State *J, int notin)
{
js_Ast *a = logand(J, notin);
int line = J->lexline;
if (jsP_accept(J, TK_OR)) {
INCREC();
a = EXP2(LOGOR, a, logor(J, notin));
DECREC();
}
return a;
}
static js_Ast *conditional(js_State *J, int notin)
{
js_Ast *a = logor(J, notin);
int line = J->lexline;
if (jsP_accept(J, '?')) {
js_Ast *b, *c;
INCREC();
b = assignment(J, 0);
jsP_expect(J, ':');
c = assignment(J, notin);
DECREC();
return EXP3(COND, a, b, c);
}
return a;
}
static js_Ast *assignment(js_State *J, int notin)
{
js_Ast *a = conditional(J, notin);
int line = J->lexline;
INCREC();
if (jsP_accept(J, '=')) a = EXP2(ASS, a, assignment(J, notin));
else if (jsP_accept(J, TK_MUL_ASS)) a = EXP2(ASS_MUL, a, assignment(J, notin));
else if (jsP_accept(J, TK_DIV_ASS)) a = EXP2(ASS_DIV, a, assignment(J, notin));
else if (jsP_accept(J, TK_MOD_ASS)) a = EXP2(ASS_MOD, a, assignment(J, notin));
else if (jsP_accept(J, TK_ADD_ASS)) a = EXP2(ASS_ADD, a, assignment(J, notin));
else if (jsP_accept(J, TK_SUB_ASS)) a = EXP2(ASS_SUB, a, assignment(J, notin));
else if (jsP_accept(J, TK_SHL_ASS)) a = EXP2(ASS_SHL, a, assignment(J, notin));
else if (jsP_accept(J, TK_SHR_ASS)) a = EXP2(ASS_SHR, a, assignment(J, notin));
else if (jsP_accept(J, TK_USHR_ASS)) a = EXP2(ASS_USHR, a, assignment(J, notin));
else if (jsP_accept(J, TK_AND_ASS)) a = EXP2(ASS_BITAND, a, assignment(J, notin));
else if (jsP_accept(J, TK_XOR_ASS)) a = EXP2(ASS_BITXOR, a, assignment(J, notin));
else if (jsP_accept(J, TK_OR_ASS)) a = EXP2(ASS_BITOR, a, assignment(J, notin));
DECREC();
return a;
}
static js_Ast *expression(js_State *J, int notin)
{
js_Ast *a = assignment(J, notin);
SAVEREC();
int line = J->lexline;
while (jsP_accept(J, ',')) {
INCREC();
a = EXP2(COMMA, a, assignment(J, notin));
line = J->lexline;
}
POPREC();
return a;
}
/* Statements */
static js_Ast *vardec(js_State *J, int notin)
{
js_Ast *a = identifier(J);
int line = J->lexline;
if (jsP_accept(J, '='))
return EXP2(VAR, a, assignment(J, notin));
return EXP1(VAR, a);
}
static js_Ast *vardeclist(js_State *J, int notin)
{
js_Ast *head, *tail;
head = tail = LIST(vardec(J, notin));
while (jsP_accept(J, ','))
tail = tail->b = LIST(vardec(J, notin));
return jsP_list(head);
}
static js_Ast *statementlist(js_State *J)
{
js_Ast *head, *tail;
if (J->lookahead == '}' || J->lookahead == TK_CASE || J->lookahead == TK_DEFAULT)
return NULL;
head = tail = LIST(statement(J));
while (J->lookahead != '}' && J->lookahead != TK_CASE && J->lookahead != TK_DEFAULT)
tail = tail->b = LIST(statement(J));
return jsP_list(head);
}
static js_Ast *caseclause(js_State *J)
{
js_Ast *a, *b;
int line = J->lexline;
if (jsP_accept(J, TK_CASE)) {
a = expression(J, 0);
jsP_expect(J, ':');
b = statementlist(J);
return STM2(CASE, a, b);
}
if (jsP_accept(J, TK_DEFAULT)) {
jsP_expect(J, ':');
a = statementlist(J);
return STM1(DEFAULT, a);
}
jsP_error(J, "unexpected token in switch: %s (expected 'case' or 'default')", jsY_tokenstring(J->lookahead));
}
static js_Ast *caselist(js_State *J)
{
js_Ast *head, *tail;
if (J->lookahead == '}')
return NULL;
head = tail = LIST(caseclause(J));
while (J->lookahead != '}')
tail = tail->b = LIST(caseclause(J));
return jsP_list(head);
}
static js_Ast *block(js_State *J)
{
js_Ast *a;
int line = J->lexline;
jsP_expect(J, '{');
a = statementlist(J);
jsP_expect(J, '}');
return STM1(BLOCK, a);
}
static js_Ast *forexpression(js_State *J, int end)
{
js_Ast *a = NULL;
if (J->lookahead != end)
a = expression(J, 0);
jsP_expect(J, end);
return a;
}
static js_Ast *forstatement(js_State *J, int line)
{
js_Ast *a, *b, *c, *d;
jsP_expect(J, '(');
if (jsP_accept(J, TK_VAR)) {
a = vardeclist(J, 1);
if (jsP_accept(J, ';')) {
b = forexpression(J, ';');
c = forexpression(J, ')');
d = statement(J);
return STM4(FOR_VAR, a, b, c, d);
}
if (jsP_accept(J, TK_IN)) {
b = expression(J, 0);
jsP_expect(J, ')');
c = statement(J);
return STM3(FOR_IN_VAR, a, b, c);
}
jsP_error(J, "unexpected token in for-var-statement: %s", jsY_tokenstring(J->lookahead));
}
if (J->lookahead != ';')
a = expression(J, 1);
else
a = NULL;
if (jsP_accept(J, ';')) {
b = forexpression(J, ';');
c = forexpression(J, ')');
d = statement(J);
return STM4(FOR, a, b, c, d);
}
if (jsP_accept(J, TK_IN)) {
b = expression(J, 0);
jsP_expect(J, ')');
c = statement(J);
return STM3(FOR_IN, a, b, c);
}
jsP_error(J, "unexpected token in for-statement: %s", jsY_tokenstring(J->lookahead));
}
static js_Ast *statement(js_State *J)
{
js_Ast *a, *b, *c, *d;
js_Ast *stm;
int line = J->lexline;
INCREC();
if (J->lookahead == '{') {
stm = block(J);
}
else if (jsP_accept(J, TK_VAR)) {
a = vardeclist(J, 0);
semicolon(J);
stm = STM1(VAR, a);
}
/* empty statement */
else if (jsP_accept(J, ';')) {
stm = STM0(EMPTY);
}
else if (jsP_accept(J, TK_IF)) {
jsP_expect(J, '(');
a = expression(J, 0);
jsP_expect(J, ')');
b = statement(J);
if (jsP_accept(J, TK_ELSE))
c = statement(J);
else
c = NULL;
stm = STM3(IF, a, b, c);
}
else if (jsP_accept(J, TK_DO)) {
a = statement(J);
jsP_expect(J, TK_WHILE);
jsP_expect(J, '(');
b = expression(J, 0);
jsP_expect(J, ')');
semicolon(J);
stm = STM2(DO, a, b);
}
else if (jsP_accept(J, TK_WHILE)) {
jsP_expect(J, '(');
a = expression(J, 0);
jsP_expect(J, ')');
b = statement(J);
stm = STM2(WHILE, a, b);
}
else if (jsP_accept(J, TK_FOR)) {
stm = forstatement(J, line);
}
else if (jsP_accept(J, TK_CONTINUE)) {
a = identifieropt(J);
semicolon(J);
stm = STM1(CONTINUE, a);
}
else if (jsP_accept(J, TK_BREAK)) {
a = identifieropt(J);
semicolon(J);
stm = STM1(BREAK, a);
}
else if (jsP_accept(J, TK_RETURN)) {
if (J->lookahead != ';' && J->lookahead != '}' && J->lookahead != 0)
a = expression(J, 0);
else
a = NULL;
semicolon(J);
stm = STM1(RETURN, a);
}
else if (jsP_accept(J, TK_WITH)) {
jsP_expect(J, '(');
a = expression(J, 0);
jsP_expect(J, ')');
b = statement(J);
stm = STM2(WITH, a, b);
}
else if (jsP_accept(J, TK_SWITCH)) {
jsP_expect(J, '(');
a = expression(J, 0);
jsP_expect(J, ')');
jsP_expect(J, '{');
b = caselist(J);
jsP_expect(J, '}');
stm = STM2(SWITCH, a, b);
}
else if (jsP_accept(J, TK_THROW)) {
a = expression(J, 0);
semicolon(J);
stm = STM1(THROW, a);
}
else if (jsP_accept(J, TK_TRY)) {
a = block(J);
b = c = d = NULL;
if (jsP_accept(J, TK_CATCH)) {
jsP_expect(J, '(');
b = identifier(J);
jsP_expect(J, ')');
c = block(J);
}
if (jsP_accept(J, TK_FINALLY)) {
d = block(J);
}
if (!b && !d)
jsP_error(J, "unexpected token in try: %s (expected 'catch' or 'finally')", jsY_tokenstring(J->lookahead));
stm = STM4(TRY, a, b, c, d);
}
else if (jsP_accept(J, TK_DEBUGGER)) {
semicolon(J);
stm = STM0(DEBUGGER);
}
else if (jsP_accept(J, TK_FUNCTION)) {
jsP_warning(J, "function statements are not standard");
stm = funstm(J, line);
}
/* labelled statement or expression statement */
else if (J->lookahead == TK_IDENTIFIER) {
a = expression(J, 0);
if (a->type == EXP_IDENTIFIER && jsP_accept(J, ':')) {
a->type = AST_IDENTIFIER;
b = statement(J);
stm = STM2(LABEL, a, b);
} else {
semicolon(J);
stm = a;
}
}
/* expression statement */
else {
stm = expression(J, 0);
semicolon(J);
}
DECREC();
return stm;
}
/* Program */
static js_Ast *scriptelement(js_State *J)
{
int line = J->lexline;
if (jsP_accept(J, TK_FUNCTION))
return fundec(J, line);
return statement(J);
}
static js_Ast *script(js_State *J, int terminator)
{
js_Ast *head, *tail;
if (J->lookahead == terminator)
return NULL;
head = tail = LIST(scriptelement(J));
while (J->lookahead != terminator)
tail = tail->b = LIST(scriptelement(J));
return jsP_list(head);
}
static js_Ast *funbody(js_State *J)
{
js_Ast *a;
jsP_expect(J, '{');
a = script(J, '}');
jsP_expect(J, '}');
return a;
}
/* Constant folding */
static int toint32(double d)
{
double two32 = 4294967296.0;
double two31 = 2147483648.0;
if (!isfinite(d) || d == 0)
return 0;
d = fmod(d, two32);
d = d >= 0 ? floor(d) : ceil(d) + two32;
if (d >= two31)
return d - two32;
else
return d;
}
static unsigned int touint32(double d)
{
return (unsigned int)toint32(d);
}
static int jsP_setnumnode(js_Ast *node, double x)
{
node->type = EXP_NUMBER;
node->number = x;
node->a = node->b = node->c = node->d = NULL;
return 1;
}
static int jsP_foldconst(js_Ast *node)
{
double x, y;
int a, b;
if (node->type == AST_LIST) {
while (node) {
jsP_foldconst(node->a);
node = node->b;
}
return 0;
}
if (node->type == EXP_NUMBER)
return 1;
a = node->a ? jsP_foldconst(node->a) : 0;
b = node->b ? jsP_foldconst(node->b) : 0;
if (node->c) jsP_foldconst(node->c);
if (node->d) jsP_foldconst(node->d);
if (a) {
x = node->a->number;
switch (node->type) {
default: break;
case EXP_NEG: return jsP_setnumnode(node, -x);
case EXP_POS: return jsP_setnumnode(node, x);
case EXP_BITNOT: return jsP_setnumnode(node, ~toint32(x));
}
if (b) {
y = node->b->number;
switch (node->type) {
default: break;
case EXP_MUL: return jsP_setnumnode(node, x * y);
case EXP_DIV: return jsP_setnumnode(node, x / y);
case EXP_MOD: return jsP_setnumnode(node, fmod(x, y));
case EXP_ADD: return jsP_setnumnode(node, x + y);
case EXP_SUB: return jsP_setnumnode(node, x - y);
case EXP_SHL: return jsP_setnumnode(node, toint32(x) << (touint32(y) & 0x1F));
case EXP_SHR: return jsP_setnumnode(node, toint32(x) >> (touint32(y) & 0x1F));
case EXP_USHR: return jsP_setnumnode(node, touint32(x) >> (touint32(y) & 0x1F));
case EXP_BITAND: return jsP_setnumnode(node, toint32(x) & toint32(y));
case EXP_BITXOR: return jsP_setnumnode(node, toint32(x) ^ toint32(y));
case EXP_BITOR: return jsP_setnumnode(node, toint32(x) | toint32(y));
}
}
}
return 0;
}
/* Main entry point */
js_Ast *jsP_parse(js_State *J, const char *filename, const char *source)
{
js_Ast *p;
jsY_initlex(J, filename, source);
jsP_next(J);
J->astdepth = 0;
p = script(J, 0);
if (p)
jsP_foldconst(p);
return p;
}
js_Ast *jsP_parsefunction(js_State *J, const char *filename, const char *params, const char *body)
{
js_Ast *p = NULL;
int line = 0;
if (params) {
jsY_initlex(J, filename, params);
jsP_next(J);
J->astdepth = 0;
p = parameters(J);
}
return EXP3(FUN, NULL, p, jsP_parse(J, filename, body));
}