ref: 27ce19d25de84f23f10905db49bf83e95fea4257
dir: /js-parse.c/
#include "js.h"
#include "js-parse.h"
#include "js-ast.h"
#define A1(x,a) jsP_newnode(J, x, a, 0, 0, 0)
#define A2(x,a,b) jsP_newnode(J, x, a, b, 0, 0)
#define A3(x,a,b,c) jsP_newnode(J, x, a, b, c, 0)
#define LIST(h) jsP_newnode(J, AST_LIST, h, 0, 0, 0);
#define EXP0(x) jsP_newnode(J, EXP_ ## x, 0, 0, 0, 0)
#define EXP1(x,a) jsP_newnode(J, EXP_ ## x, a, 0, 0, 0)
#define EXP2(x,a,b) jsP_newnode(J, EXP_ ## x, a, b, 0, 0)
#define EXP3(x,a,b,c) jsP_newnode(J, EXP_ ## x, a, b, c, 0)
#define STM0(x) jsP_newnode(J, STM_ ## x, 0, 0, 0, 0)
#define STM1(x,a) jsP_newnode(J, STM_ ## x, a, 0, 0, 0)
#define STM2(x,a,b) jsP_newnode(J, STM_ ## x, a, b, 0, 0)
#define STM3(x,a,b,c) jsP_newnode(J, STM_ ## x, a, b, c, 0)
#define STM4(x,a,b,c,d) jsP_newnode(J, STM_ ## x, 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 *funcbody(js_State *J);
static const char *tokenstring[] = {
"(end-of-file)",
"'\\x01'", "'\\x02'", "'\\x03'", "'\\x04'", "'\\x05'", "'\\x06'", "'\\x07'",
"'\\x08'", "'\\x09'", "'\\x0A'", "'\\x0B'", "'\\x0C'", "'\\x0D'", "'\\x0E'", "'\\x0F'",
"'\\x10'", "'\\x11'", "'\\x12'", "'\\x13'", "'\\x14'", "'\\x15'", "'\\x16'", "'\\x17'",
"'\\x18'", "'\\x19'", "'\\x1A'", "'\\x1B'", "'\\x1C'", "'\\x1D'", "'\\x1E'", "'\\x1F'",
"' '", "'!'", "'\"'", "'#'", "'$'", "'%'", "'&'", "'\\''",
"'('", "')'", "'*'", "'+'", "','", "'-'", "'.'", "'/'",
"'0'", "'1'", "'2'", "'3'", "'4'", "'5'", "'6'", "'7'",
"'8'", "'9'", "':'", "';'", "'<'", "'='", "'>'", "'?'",
"'@'", "'A'", "'B'", "'C'", "'D'", "'E'", "'F'", "'G'",
"'H'", "'I'", "'J'", "'K'", "'L'", "'M'", "'N'", "'O'",
"'P'", "'Q'", "'R'", "'S'", "'T'", "'U'", "'V'", "'W'",
"'X'", "'Y'", "'Z'", "'['", "'\'", "']'", "'^'", "'_'",
"'`'", "'a'", "'b'", "'c'", "'d'", "'e'", "'f'", "'g'",
"'h'", "'i'", "'j'", "'k'", "'l'", "'m'", "'n'", "'o'",
"'p'", "'q'", "'r'", "'s'", "'t'", "'u'", "'v'", "'w'",
"'x'", "'y'", "'z'", "'{'", "'|'", "'}'", "'~'", "'\\x7F'",
0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0,
0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0,
0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0,
0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0,
0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0,
0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0,
0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0,
0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0,
"(identifier)", "(number)", "(string)", "(regexp)",
"'<='", "'>='", "'=='", "'!='", "'==='", "'!=='",
"'<<'", "'>>'", "'>>>'", "'&&'", "'||'",
"'+='", "'-='", "'*='", "'/='", "'%='",
"'<<='", "'>>='", "'>>>='", "'&='", "'|='", "'^='",
"'++'", "'--'",
"'break'", "'case'", "'catch'", "'continue'", "'debugger'",
"'default'", "'delete'", "'do'", "'else'", "'false'", "'finally'", "'for'",
"'function'", "'if'", "'in'", "'instanceof'", "'new'", "'null'", "'return'",
"'switch'", "'this'", "'throw'", "'true'", "'try'", "'typeof'", "'var'",
"'void'", "'while'", "'with'",
};
static inline void next(js_State *J)
{
J->lookahead = jsP_lex(J);
}
static inline int accept(js_State *J, int t)
{
if (J->lookahead == t) {
next(J);
return 1;
}
return 0;
}
static inline void expect(js_State *J, int t)
{
if (accept(J, t))
return;
jsP_error(J, "unexpected token: %s (expected %s)", tokenstring[J->lookahead], tokenstring[t]);
}
static void semicolon(js_State *J)
{
if (J->lookahead == ';') {
next(J);
return;
}
if (J->newline || J->lookahead == '}' || J->lookahead == 0)
return;
jsP_error(J, "unexpected token: %s (expected ';')", tokenstring[J->lookahead]);
}
static js_Ast *identifier(js_State *J)
{
if (J->lookahead == TK_IDENTIFIER) {
js_Ast *a = jsP_newstrnode(J, AST_IDENTIFIER, J->text);
next(J);
return a;
}
jsP_error(J, "unexpected token: %s (expected identifier)", tokenstring[J->lookahead]);
return NULL;
}
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);
next(J);
return a;
}
jsP_error(J, "unexpected token: %s (expected identifier or keyword)", tokenstring[J->lookahead]);
return NULL;
}
static js_Ast *arguments(js_State *J)
{
js_Ast *head, *tail, *node;
if (J->lookahead == ')')
return NULL;
node = assignment(J, 0);
head = tail = LIST(node);
while (accept(J, ',')) {
node = assignment(J, 0);
tail = tail->b = LIST(node);
}
return head;
}
static js_Ast *arrayliteral(js_State *J)
{
js_Ast *head, *tail, *node;
while (J->lookahead == ',')
next(J);
if (J->lookahead == ']')
return NULL;
node = assignment(J, 0);
head = tail = LIST(node);
while (accept(J, ',')) {
while (J->lookahead == ',')
next(J);
if (J->lookahead == ']')
break;
node = assignment(J, 0);
tail = tail->b = LIST(node);
}
return head;
}
static js_Ast *propname(js_State *J)
{
js_Ast *name;
if (J->lookahead == TK_NUMBER) {
name = jsP_newnumnode(J, AST_NUMBER, J->number);
next(J);
} else if (J->lookahead == TK_STRING) {
name = jsP_newstrnode(J, AST_STRING, J->text);
next(J);
} else {
name = identifiername(J);
}
return name;
}
static js_Ast *propassign(js_State *J)
{
js_Ast *name, *value, *arg, *body;
if (J->lookahead == TK_IDENTIFIER && !strcmp(J->text, "get")) {
next(J);
name = propname(J);
expect(J, '(');
expect(J, ')');
body = funcbody(J);
return EXP2(PROP_GET, name, body);
}
if (J->lookahead == TK_IDENTIFIER && !strcmp(J->text, "set")) {
next(J);
name = propname(J);
expect(J, '(');
arg = identifier(J);
expect(J, ')');
body = funcbody(J);
return EXP3(PROP_SET, name, arg, body);
}
name = propname(J);
expect(J, ':');
value = assignment(J, 0);
return EXP2(PROP_VAL, name, value);
}
static js_Ast *objectliteral(js_State *J)
{
js_Ast *head, *tail, *node;
if (J->lookahead == '}')
return NULL;
node = propassign(J);
head = tail = LIST(node);
while (accept(J, ',')) {
if (J->lookahead == '}')
break;
node = propassign(J);
tail = tail->b = LIST(node);
}
return head;
}
static js_Ast *primary(js_State *J)
{
js_Ast *a;
if (J->lookahead == TK_IDENTIFIER) {
a = jsP_newstrnode(J, AST_IDENTIFIER, J->text);
next(J);
return a;
}
if (J->lookahead == TK_STRING) {
a = jsP_newstrnode(J, AST_STRING, J->text);
next(J);
return a;
}
if (J->lookahead == TK_REGEXP) {
a = jsP_newstrnode(J, AST_REGEXP, J->text);
// TODO: flags
next(J);
return a;
}
if (J->lookahead == TK_NUMBER) {
a = jsP_newnumnode(J, AST_NUMBER, J->number);
next(J);
return a;
}
if (accept(J, TK_THIS)) return EXP0(THIS);
if (accept(J, TK_NULL)) return EXP0(NULL);
if (accept(J, TK_TRUE)) return EXP0(TRUE);
if (accept(J, TK_FALSE)) return EXP0(FALSE);
if (accept(J, '{')) { a = EXP1(OBJECT, objectliteral(J)); expect(J, '}'); return a; }
if (accept(J, '[')) { a = EXP1(ARRAY, arrayliteral(J)); expect(J, ']'); return a; }
if (accept(J, '(')) { a = expression(J, 0); expect(J, ')'); return a; }
jsP_error(J, "unexpected token in expression: %s", tokenstring[J->lookahead]);
return NULL;
}
static js_Ast *paramlist(js_State *J)
{
js_Ast *head, *tail, *node;
if (J->lookahead == ')')
return NULL;
node = identifier(J);
head = tail = LIST(node);
while (accept(J, ',')) {
node = identifier(J);
tail = tail->b = LIST(node);
}
return head;
}
static js_Ast *newexp(js_State *J)
{
js_Ast *a, *b, *c;
if (accept(J, TK_NEW)) {
a = memberexp(J);
if (accept(J, '(')) {
b = arguments(J);
expect(J, ')');
return EXP2(NEW, a, b);
}
return EXP1(NEW, a);
}
if (accept(J, TK_FUNCTION)) {
a = identifieropt(J);
expect(J, '(');
b = paramlist(J);
expect(J, ')');
c = funcbody(J);
return EXP3(FUNC, a, b, c);
}
return primary(J);
}
static js_Ast *memberexp(js_State *J)
{
js_Ast *a = newexp(J);
loop:
if (accept(J, '.')) { a = EXP2(MEMBER, a, identifiername(J)); goto loop; }
if (accept(J, '[')) { a = EXP2(INDEX, a, expression(J, 0)); expect(J, ']'); goto loop; }
return a;
}
static js_Ast *callexp(js_State *J)
{
js_Ast *a = newexp(J);
loop:
if (accept(J, '.')) { a = EXP2(MEMBER, a, identifiername(J)); goto loop; }
if (accept(J, '[')) { a = EXP2(INDEX, a, expression(J, 0)); expect(J, ']'); goto loop; }
if (accept(J, '(')) { a = EXP2(CALL, a, arguments(J)); expect(J, ')'); goto loop; }
return a;
}
static js_Ast *postfix(js_State *J)
{
js_Ast *a = callexp(J);
if (!J->newline && accept(J, TK_INC)) return EXP1(POSTINC, a);
if (!J->newline && accept(J, TK_DEC)) return EXP1(POSTDEC, a);
return a;
}
static js_Ast *unary(js_State *J)
{
if (accept(J, TK_DELETE)) return EXP1(DELETE, unary(J));
if (accept(J, TK_VOID)) return EXP1(VOID, unary(J));
if (accept(J, TK_TYPEOF)) return EXP1(TYPEOF, unary(J));
if (accept(J, TK_INC)) return EXP1(PREINC, unary(J));
if (accept(J, TK_DEC)) return EXP1(PREDEC, unary(J));
if (accept(J, '+')) return EXP1(POS, unary(J));
if (accept(J, '-')) return EXP1(NEG, unary(J));
if (accept(J, '~')) return EXP1(BITNOT, unary(J));
if (accept(J, '!')) return EXP1(LOGNOT, unary(J));
return postfix(J);
}
static js_Ast *multiplicative(js_State *J)
{
js_Ast *a = unary(J);
loop:
if (accept(J, '*')) { a = EXP2(MUL, a, unary(J)); goto loop; }
if (accept(J, '/')) { a = EXP2(DIV, a, unary(J)); goto loop; }
if (accept(J, '%')) { a = EXP2(MOD, a, unary(J)); goto loop; }
return a;
}
static js_Ast *additive(js_State *J)
{
js_Ast *a = multiplicative(J);
loop:
if (accept(J, '+')) { a = EXP2(ADD, a, multiplicative(J)); goto loop; }
if (accept(J, '-')) { a = EXP2(SUB, a, multiplicative(J)); goto loop; }
return a;
}
static js_Ast *shift(js_State *J)
{
js_Ast *a = additive(J);
loop:
if (accept(J, TK_SHL)) { a = EXP2(SHL, a, additive(J)); goto loop; }
if (accept(J, TK_SHR)) { a = EXP2(SHR, a, additive(J)); goto loop; }
if (accept(J, TK_USHR)) { a = EXP2(USHR, a, additive(J)); goto loop; }
return a;
}
static js_Ast *relational(js_State *J, int notin)
{
js_Ast *a = shift(J);
loop:
if (accept(J, '<')) { a = EXP2(LT, a, shift(J)); goto loop; }
if (accept(J, '>')) { a = EXP2(GT, a, shift(J)); goto loop; }
if (accept(J, TK_LE)) { a = EXP2(LE, a, shift(J)); goto loop; }
if (accept(J, TK_GE)) { a = EXP2(GE, a, shift(J)); goto loop; }
if (accept(J, TK_INSTANCEOF)) { a = EXP2(INSTANCEOF, a, shift(J)); goto loop; }
if (!notin && accept(J, TK_IN)) { a = EXP2(IN, a, shift(J)); goto loop; }
return a;
}
static js_Ast *equality(js_State *J, int notin)
{
js_Ast *a = relational(J, notin);
loop:
if (accept(J, TK_EQ)) { a = EXP2(EQ, a, relational(J, notin)); goto loop; }
if (accept(J, TK_NE)) { a = EXP2(NE, a, relational(J, notin)); goto loop; }
if (accept(J, TK_EQ3)) { a = EXP2(EQ3, a, relational(J, notin)); goto loop; }
if (accept(J, TK_NE3)) { a = EXP2(NE3, a, relational(J, notin)); goto loop; }
return a;
}
static js_Ast *bitand(js_State *J, int notin)
{
js_Ast *a = equality(J, notin);
while (accept(J, '&'))
a = EXP2(BITAND, a, equality(J, notin));
return a;
}
static js_Ast *bitxor(js_State *J, int notin)
{
js_Ast *a = bitand(J, notin);
while (accept(J, '^'))
a = EXP2(BITXOR, a, bitand(J, notin));
return a;
}
static js_Ast *bitor(js_State *J, int notin)
{
js_Ast *a = bitxor(J, notin);
while (accept(J, '|'))
a = EXP2(BITOR, a, bitxor(J, notin));
return a;
}
static js_Ast *logand(js_State *J, int notin)
{
js_Ast *a = bitor(J, notin);
while (accept(J, TK_AND))
a = EXP2(LOGAND, a, bitor(J, notin));
return a;
}
static js_Ast *logor(js_State *J, int notin)
{
js_Ast *a = logand(J, notin);
while (accept(J, TK_OR))
a = EXP2(LOGOR, a, logand(J, notin));
return a;
}
static js_Ast *conditional(js_State *J, int notin)
{
js_Ast *a, *b, *c;
a = logor(J, notin);
if (accept(J, '?')) {
b = assignment(J, notin);
expect(J, ':');
c = assignment(J, notin);
return EXP3(COND, a, b, c);
}
return a;
}
static js_Ast *assignment(js_State *J, int notin)
{
js_Ast *a = conditional(J, notin);
if (accept(J, '=')) return EXP2(ASS, a, assignment(J, notin));
if (accept(J, TK_MUL_ASS)) return EXP2(ASS_MUL, a, assignment(J, notin));
if (accept(J, TK_DIV_ASS)) return EXP2(ASS_DIV, a, assignment(J, notin));
if (accept(J, TK_MOD_ASS)) return EXP2(ASS_MOD, a, assignment(J, notin));
if (accept(J, TK_ADD_ASS)) return EXP2(ASS_ADD, a, assignment(J, notin));
if (accept(J, TK_SUB_ASS)) return EXP2(ASS_SUB, a, assignment(J, notin));
if (accept(J, TK_SHL_ASS)) return EXP2(ASS_SHL, a, assignment(J, notin));
if (accept(J, TK_SHR_ASS)) return EXP2(ASS_SHR, a, assignment(J, notin));
if (accept(J, TK_USHR_ASS)) return EXP2(ASS_USHR, a, assignment(J, notin));
if (accept(J, TK_AND_ASS)) return EXP2(ASS_BITAND, a, assignment(J, notin));
if (accept(J, TK_XOR_ASS)) return EXP2(ASS_BITXOR, a, assignment(J, notin));
if (accept(J, TK_OR_ASS)) return EXP2(ASS_BITOR, a, assignment(J, notin));
return a;
}
static js_Ast *expression(js_State *J, int notin)
{
js_Ast *a = assignment(J, notin);
while (accept(J, ','))
a = EXP2(COMMA, a, assignment(J, notin));
return a;
}
static js_Ast *vardec(js_State *J, int notin)
{
js_Ast *a, *b;
a = identifier(J);
if (accept(J, '='))
b = assignment(J, notin);
else
b = NULL;
return A2(AST_INIT, a, b);
}
static js_Ast *vardeclist(js_State *J, int notin)
{
js_Ast *head, *tail, *node;
node = vardec(J, notin);
head = tail = LIST(node);
while (accept(J, ',')) {
node = vardec(J, notin);
tail = tail->b = LIST(node);
}
return head;
}
static js_Ast *expopt(js_State *J, int end)
{
js_Ast *a = NULL;
if (J->lookahead != end)
a = expression(J, 0);
expect(J, end);
return a;
}
static js_Ast *casestatementlist(js_State *J)
{
js_Ast *head, *tail, *node;
if (J->lookahead == '}' || J->lookahead == TK_CASE || J->lookahead == TK_DEFAULT)
return NULL;
node = statement(J);
head = tail = LIST(node);
while (J->lookahead != '}' && J->lookahead != TK_CASE && J->lookahead != TK_DEFAULT) {
node = statement(J);
tail = tail->b = LIST(node);
}
return head;
}
static js_Ast *caseclause(js_State *J)
{
js_Ast *a, *b;
if (accept(J, TK_CASE)) {
a = expression(J, 0);
expect(J, ':');
b = casestatementlist(J);
return STM2(CASE, a, b);
}
if (accept(J, TK_DEFAULT)) {
expect(J, ':');
a = casestatementlist(J);
return STM1(DEFAULT, a);
}
jsP_error(J, "unexpected token in switch: %s", tokenstring[J->lookahead]);
return NULL;
}
static js_Ast *caseblock(js_State *J)
{
js_Ast *head, *tail, *node;
expect(J, '{');
if (accept(J, '}'))
return NULL;
node = caseclause(J);
head = tail = LIST(node);
while (J->lookahead != '}') {
node = caseclause(J);
tail = tail->b = LIST(node);
}
expect(J, '}');
return head;
}
static js_Ast *block(js_State *J)
{
js_Ast *head, *tail, *node;
expect(J, '{');
if (accept(J, '}'))
return STM1(BLOCK, NULL);
node = statement(J);
head = tail = LIST(node);
while (J->lookahead != '}') {
node = statement(J);
tail = tail->b = LIST(node);
}
expect(J, '}');
return STM1(BLOCK, head);
}
static js_Ast *statement(js_State *J)
{
js_Ast *a, *b, *c, *d;
if (J->lookahead == '{') {
return block(J);
}
if (accept(J, ';')) {
return STM0(NOP);
}
if (accept(J, TK_CONTINUE)) {
a = identifieropt(J);
semicolon(J);
return STM1(CONTINUE, a);
}
if (accept(J, TK_BREAK)) {
a = identifieropt(J);
semicolon(J);
return STM1(BREAK, a);
}
if (accept(J, TK_RETURN)) {
if (J->lookahead != ';' && J->lookahead != '}' && J->lookahead != 0)
a = expression(J, 0);
else
a = NULL;
semicolon(J);
return STM1(RETURN, a);
}
if (accept(J, TK_WITH)) {
expect(J, '(');
a = expression(J, 0);
expect(J, ')');
b = statement(J);
return STM2(WITH, a, b);
}
if (accept(J, TK_THROW)) {
a = expression(J, 0);
semicolon(J);
return STM1(THROW, a);
}
if (accept(J, TK_TRY)) {
a = block(J);
b = c = d = NULL;
if (accept(J, TK_CATCH)) {
expect(J, '(');
b = identifier(J);
expect(J, ')');
c = block(J);
}
if (accept(J, TK_FINALLY)) {
d = block(J);
}
if (!b && !d)
jsP_error(J, "unexpected token: %s (expected 'catch' or 'finally')", tokenstring[J->lookahead]);
return STM4(TRY, a, b, c, d);
}
if (accept(J, TK_DEBUGGER)) {
semicolon(J);
return STM0(DEBUGGER);
}
if (accept(J, TK_IF)) {
expect(J, '(');
a = expression(J, 0);
expect(J, ')');
b = statement(J);
if (accept(J, TK_ELSE))
c = statement(J);
else
c = NULL;
return STM3(IF, a, b, c);
}
if (accept(J, TK_DO)) {
a = statement(J);
expect(J, TK_WHILE);
expect(J, '(');
b = expression(J, 0);
expect(J, ')');
semicolon(J);
return STM2(DO, a, b);
}
if (accept(J, TK_WHILE)) {
expect(J, '(');
a = expression(J, 0);
expect(J, ')');
b = statement(J);
return STM2(WHILE, a, b);
}
if (accept(J, TK_VAR)) {
a = vardeclist(J, 0);
semicolon(J);
return STM1(VAR, a);
}
if (accept(J, TK_FOR)) {
expect(J, '(');
if (accept(J, TK_VAR)) {
a = vardeclist(J, 1);
if (accept(J, ';')) {
b = expopt(J, ';');
c = expopt(J, ')');
d = statement(J);
return STM4(FOR_VAR, a, b, c, d);
}
if (accept(J, TK_IN)) {
b = expression(J, 0);
expect(J, ')');
c = statement(J);
return STM3(FOR_IN_VAR, a, b, c);
}
jsP_error(J, "unexpected token in for-var-statement: %s", tokenstring[J->lookahead]);
return NULL;
}
if (J->lookahead != ';') {
a = expression(J, 1);
}
if (accept(J, ';')) {
b = expopt(J, ';');
c = expopt(J, ')');
d = statement(J);
return STM4(FOR, a, b, c, d);
}
if (accept(J, TK_IN)) {
b = expression(J, 0);
expect(J, ')');
c = statement(J);
return STM3(FOR_IN, a, b, c);
}
jsP_error(J, "unexpected token in for-statement: %s", tokenstring[J->lookahead]);
return NULL;
}
if (accept(J, TK_SWITCH)) {
expect(J, '(');
a = expression(J, 0);
expect(J, ')');
b = caseblock(J);
return STM2(SWITCH, a, b);
}
/* LabelledStatement : Identifier ':' Statement */
/* ExpressionStatement : Expression ';' */
if (J->lookahead == TK_IDENTIFIER) {
a = expression(J, 0);
if (a->type == AST_IDENTIFIER && accept(J, ':')) {
b = statement(J);
return STM2(LABEL, a, b);
}
semicolon(J);
return a;
}
/* ExpressionStatement : [lookahead not 'function' or '{'] Expression ';' */
if (J->lookahead != TK_FUNCTION && J->lookahead != '{') {
a = expression(J, 0);
semicolon(J);
return a;
}
jsP_error(J, "unexpected token in statement: %s", tokenstring[J->lookahead]);
return NULL;
}
static js_Ast *chunknode(js_State *J)
{
js_Ast *a, *b, *c;
if (accept(J, TK_FUNCTION)) {
a = identifier(J);
expect(J, '(');
b = paramlist(J);
expect(J, ')');
c = funcbody(J);
return STM3(FUNC, a, b, c);
}
return statement(J);
}
static js_Ast *chunk(js_State *J)
{
js_Ast *head, *tail, *node;
if (J->lookahead == '}' || J->lookahead == 0)
return NULL;
node = chunknode(J);
head = tail = LIST(node);
while (J->lookahead != '}' && J->lookahead != 0) {
node = chunknode(J);
tail = tail->b = LIST(node);
}
return head;
}
static js_Ast *funcbody(js_State *J)
{
js_Ast *a;
expect(J, '{');
a = chunk(J);
expect(J, '}');
return a;
}
int jsP_error(js_State *J, const char *fmt, ...)
{
va_list ap;
fprintf(stderr, "syntax error: %s:%d: ", J->filename, J->line);
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
fprintf(stderr, "\n");
longjmp(J->jb, 1);
return 0;
}
int jsP_parse(js_State *J, const char *filename, const char *source)
{
jsP_initlex(J, filename, source);
if (setjmp(J->jb)) {
jsP_freeast(J);
return 1;
}
next(J);
printblock(chunk(J), 0);
putchar('\n');
// TODO: compile to bytecode
jsP_freeast(J);
return 0;
}