ref: e01b4d02c0312f6ddc5b03adb78ed806d1eb22bb
dir: /jsparse.c/
#include "js.h" #include "jslex.h" #include "jsparse.h" #include "jsstate.h" #define nelem(a) (sizeof (a) / sizeof (a)[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) #define TOKSTR jsP_tokenstring(J->lookahead) 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_Ast *jsP_newnode(js_State *J, int type, js_Ast *a, js_Ast *b, js_Ast *c, js_Ast *d) { js_Ast *node = malloc(sizeof(js_Ast)); node->type = type; node->line = J->line; node->a = a; node->b = b; node->c = c; node->d = d; node->number = 0; node->string = NULL; node->next = J->ast; J->ast = node; return node; } js_Ast *jsP_newstrnode(js_State *J, int type, const char *s) { js_Ast *node = jsP_newnode(J, type, 0, 0, 0, 0); node->string = s; return node; } js_Ast *jsP_newnumnode(js_State *J, int type, double n) { js_Ast *node = jsP_newnode(J, type, 0, 0, 0, 0); node->number = n; return node; } void jsP_freeparse(js_State *J) { js_Ast *node = J->ast; while (node) { js_Ast *next = node->next; free(node); node = next; } J->ast = NULL; } /* Lookahead */ 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)", TOKSTR, jsP_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 ';')", TOKSTR); } /* Literals */ static inline int findword(const char *s, const char **list, int num) { int l = 0; int r = num - 1; while (l <= r) { int m = (l + r) >> 1; int c = strcmp(s, list[m]); if (c < 0) r = m - 1; else if (c > 0) l = m + 1; else return m; } return -1; } static const char *futurewords[] = { "class", "const", "enum", "export", "extends", "import", "super", }; static const char *strictfuturewords[] = { "implements", "interface", "let", "package", "private", "protected", "public", "static", "yield", }; static void checkfutureword(js_State *J, const char *s) { if (findword(s, futurewords, nelem(futurewords)) >= 0) jsP_error(J, "'%s' is a future reserved word", s); if (J->strict && findword(s, strictfuturewords, nelem(strictfuturewords)) >= 0) jsP_error(J, "'%s' is a strict mode future reserved word", s); } static js_Ast *identifier(js_State *J) { js_Ast *a; if (J->lookahead == TK_IDENTIFIER) { checkfutureword(J, J->text); a = jsP_newstrnode(J, AST_IDENTIFIER, J->text); next(J); return a; } jsP_error(J, "unexpected token: %s (expected identifier)", TOKSTR); 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)", TOKSTR); return NULL; } static js_Ast *arrayelement(js_State *J) { 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 (accept(J, ',')) { if (J->lookahead != ']') tail = tail->b = LIST(arrayelement(J)); } 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; name = propname(J); if (J->lookahead != ':' && name->type == AST_IDENTIFIER) { if (!strcmp(name->string, "get")) { name = propname(J); expect(J, '('); expect(J, ')'); body = funbody(J); return EXP2(PROP_GET, name, body); } if (!strcmp(name->string, "set")) { name = propname(J); expect(J, '('); arg = identifier(J); expect(J, ')'); body = funbody(J); return EXP3(PROP_SET, name, arg, body); } } 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 (accept(J, ',')) { if (J->lookahead == '}') break; tail = tail->b = LIST(propassign(J)); } return head; } /* Functions */ static js_Ast *parameters(js_State *J) { js_Ast *head, *tail; if (J->lookahead == ')') return NULL; head = tail = LIST(identifier(J)); while (accept(J, ',')) { tail = tail->b = LIST(identifier(J)); } return head; } static js_Ast *fundec(js_State *J) { js_Ast *a, *b, *c; a = identifier(J); expect(J, '('); b = parameters(J); expect(J, ')'); c = funbody(J); return jsP_newnode(J, AST_FUNDEC, a, b, c, 0); } static js_Ast *funstm(js_State *J) { js_Ast *a, *b, *c; a = identifier(J); expect(J, '('); b = parameters(J); 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) { js_Ast *a, *b, *c; a = identifieropt(J); expect(J, '('); b = parameters(J); expect(J, ')'); c = funbody(J); return EXP3(FUN, a, b, c); } /* Expressions */ 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); a->number = J->number; 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", TOKSTR); return NULL; } static js_Ast *arguments(js_State *J) { js_Ast *head, *tail; if (J->lookahead == ')') return NULL; head = tail = LIST(assignment(J, 0)); while (accept(J, ',')) { tail = tail->b = LIST(assignment(J, 0)); } return head; } static js_Ast *newexp(js_State *J) { js_Ast *a, *b; 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)) return funexp(J); 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_STRICTEQ)) { a = EXP2(STRICTEQ, a, relational(J, notin)); goto loop; } if (accept(J, TK_STRICTNE)) { a = EXP2(STRICTNE, 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); if (accept(J, TK_AND)) a = EXP2(LOGAND, a, logand(J, notin)); return a; } static js_Ast *logor(js_State *J, int notin) { js_Ast *a = logand(J, notin); if (accept(J, TK_OR)) a = EXP2(LOGOR, a, logor(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, 0); 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; } /* Statements */ static js_Ast *vardec(js_State *J, int notin) { js_Ast *a = identifier(J); if (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 (accept(J, ',')) tail = tail->b = LIST(vardec(J, notin)); return 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 head; } static js_Ast *caseclause(js_State *J) { js_Ast *a, *b; if (accept(J, TK_CASE)) { a = expression(J, 0); expect(J, ':'); b = statementlist(J); return STM2(CASE, a, b); } if (accept(J, TK_DEFAULT)) { expect(J, ':'); a = statementlist(J); return STM1(DEFAULT, a); } jsP_error(J, "unexpected token in switch: %s (expected 'case' or 'default')", TOKSTR); return NULL; } 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 head; } static js_Ast *block(js_State *J) { js_Ast *a; expect(J, '{'); a = statementlist(J); 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); expect(J, end); return a; } static js_Ast *forstatement(js_State *J) { js_Ast *a, *b, *c, *d; expect(J, '('); if (accept(J, TK_VAR)) { a = vardeclist(J, 1); if (accept(J, ';')) { b = forexpression(J, ';'); c = forexpression(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", TOKSTR); return NULL; } if (J->lookahead != ';') a = expression(J, 1); else a = NULL; if (accept(J, ';')) { b = forexpression(J, ';'); c = forexpression(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", TOKSTR); return NULL; } static js_Ast *statement(js_State *J) { js_Ast *a, *b, *c, *d; if (J->lookahead == '{') { return block(J); } if (accept(J, TK_VAR)) { a = vardeclist(J, 0); semicolon(J); return STM1(VAR, a); } /* empty statement */ if (accept(J, ';')) { return STM0(NOP); } 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_FOR)) { return forstatement(J); } 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_SWITCH)) { expect(J, '('); a = expression(J, 0); expect(J, ')'); expect(J, '{'); b = caselist(J); expect(J, '}'); return STM2(SWITCH, 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 in try: %s (expected 'catch' or 'finally')", TOKSTR); return STM4(TRY, a, b, c, d); } if (accept(J, TK_DEBUGGER)) { semicolon(J); return STM0(DEBUGGER); } if (accept(J, TK_FUNCTION)) { jsP_warning(J, "function statements are not standard"); return funstm(J); } /* labelled statement or expression statement */ 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; } /* expression statement */ a = expression(J, 0); semicolon(J); return a; jsP_error(J, "unexpected token in statement: %s", TOKSTR); return NULL; } /* Program */ static js_Ast *scriptelement(js_State *J) { if (accept(J, TK_FUNCTION)) return fundec(J); return statement(J); } static js_Ast *script(js_State *J) { js_Ast *head, *tail; if (J->lookahead == '}' || J->lookahead == 0) return NULL; head = tail = LIST(scriptelement(J)); while (J->lookahead != '}' && J->lookahead != 0) tail = tail->b = LIST(scriptelement(J)); return head; } static js_Ast *funbody(js_State *J) { js_Ast *a; expect(J, '{'); a = script(J); expect(J, '}'); return a; } void jsP_warning(js_State *J, const char *fmt, ...) { va_list ap; fprintf(stderr, "%s:%d: warning: ", J->filename, J->line); va_start(ap, fmt); vfprintf(stderr, fmt, ap); va_end(ap); fprintf(stderr, "\n"); } int jsP_error(js_State *J, const char *fmt, ...) { va_list ap; fprintf(stderr, "%s:%d: error: ", J->filename, J->line); va_start(ap, fmt); vfprintf(stderr, fmt, ap); va_end(ap); fprintf(stderr, "\n"); longjmp(J->jb, 1); } js_Ast *jsP_parse(js_State *J, const char *filename, const char *source) { jsP_initlex(J, filename, source); if (setjmp(J->jb)) { jsP_freeparse(J); return NULL; } next(J); return script(J); }