static int jsY_lexx(js_State *J)
{
J->newline = 0;
while (1) {
J->lexline = J->line; /* save location of beginning of token */
while (jsY_iswhite(J->lexchar))
jsY_next(J);
if (jsY_accept(J, '\n')) {
J->newline = 1;
if (isnlthcontext(J->lasttoken))
return ';';
continue;
}
if (jsY_accept(J, '/')) {
if (jsY_accept(J, '/')) {
lexlinecomment(J);
continue;
} else if (jsY_accept(J, '*')) {
if (lexcomment(J))
jsY_error(J, "multi-line comment not terminated");
continue;
} else if (isregexpcontext(J->lasttoken)) {
return lexregexp(J);
} else if (jsY_accept(J, '=')) {
return TK_DIV_ASS;
} else {
return '/';
}
}
if (J->lexchar >= '0' && J->lexchar <= '9') {
return lexnumber(J);
}
switch (J->lexchar) {
case '(': jsY_next(J); return '(';
case ')': jsY_next(J); return ')';
case ',': jsY_next(J); return ',';
case ':': jsY_next(J); return ':';
case ';': jsY_next(J); return ';';
case '?': jsY_next(J); return '?';
case '[': jsY_next(J); return '[';
case ']': jsY_next(J); return ']';
case '{': jsY_next(J); return '{';
case '}': jsY_next(J); return '}';
case '~': jsY_next(J); return '~';
case '\'':
case '"':
return lexstring(J);
case '.':
return lexnumber(J);
case '<':
jsY_next(J);
if (jsY_accept(J, '<')) {
if (jsY_accept(J, '='))
return TK_SHL_ASS;
return TK_SHL;
}
if (jsY_accept(J, '='))
return TK_LE;
return '<';
case '>':
jsY_next(J);
if (jsY_accept(J, '>')) {
if (jsY_accept(J, '>')) {
if (jsY_accept(J, '='))
return TK_USHR_ASS;
return TK_USHR;
}
if (jsY_accept(J, '='))
return TK_SHR_ASS;
return TK_SHR;
}
if (jsY_accept(J, '='))
return TK_GE;
return '>';
case '=':
jsY_next(J);
if (jsY_accept(J, '=')) {
if (jsY_accept(J, '='))
return TK_STRICTEQ;
return TK_EQ;
}
return '=';
case '!':
jsY_next(J);
if (jsY_accept(J, '=')) {
if (jsY_accept(J, '='))
return TK_STRICTNE;
return TK_NE;
}
return '!';
case '+':
jsY_next(J);
if (jsY_accept(J, '+'))
return TK_INC;
if (jsY_accept(J, '='))
return TK_ADD_ASS;
return '+';
case '-':
jsY_next(J);
if (jsY_accept(J, '-'))
return TK_DEC;
if (jsY_accept(J, '='))
return TK_SUB_ASS;
return '-';
case '*':
jsY_next(J);
if (jsY_accept(J, '='))
return TK_MUL_ASS;
return '*';
case '%':
jsY_next(J);
if (jsY_accept(J, '='))
return TK_MOD_ASS;
return '%';
case '&':
jsY_next(J);
if (jsY_accept(J, '&'))
return TK_AND;
if (jsY_accept(J, '='))
return TK_AND_ASS;
return '&';
case '|':
jsY_next(J);
if (jsY_accept(J, '|'))
return TK_OR;
if (jsY_accept(J, '='))
return TK_OR_ASS;
return '|';
case '^':
jsY_next(J);
if (jsY_accept(J, '='))
return TK_XOR_ASS;
return '^';
case 0:
return 0; /* EOF */
}
/* Handle \uXXXX escapes in identifiers */
jsY_unescape(J);
if (jsY_isidentifierstart(J->lexchar)) {
textinit(J);
textpush(J, J->lexchar);
jsY_next(J);
jsY_unescape(J);
while (jsY_isidentifierpart(J->lexchar)) {
textpush(J, J->lexchar);
jsY_next(J);
jsY_unescape(J);
}
textend(J);
return jsY_findkeyword(J, J->lexbuf.text);
}
if (J->lexchar >= 0x20 && J->lexchar <= 0x7E)
jsY_error(J, "unexpected character: '%c'", J->lexchar);
jsY_error(J, "unexpected character: \\u%04X", J->lexchar);
}
}
/*
* The lexical analyzer.
*/
int
yylex()
{
wint_t c, c1;
int i;
static int savetoken = 0;
static int wasfield;
static int isfuncdef;
static int nbrace, nparen, nbracket;
static struct ctosymstruct {
wint_t c, sym;
} ctosym[] = {
{ '|', BAR }, { '^', CARAT },
{ '~', TILDE }, { '<', LANGLE },
{ '>', RANGLE }, { '+', PLUSC },
{ '-', HYPHEN }, { '*', STAR },
{ '/', SLASH }, { '%', PERCENT },
{ '!', EXCLAMATION }, { '$', DOLLAR },
{ '[', LSQUARE }, { ']', RSQUARE },
{ '(', LPAREN }, { ')', RPAREN },
{ ';', SEMI }, { '{', LBRACE },
{ '}', RBRACE }, { 0, 0 }
};
if (savetoken) {
c = savetoken;
savetoken = 0;
} else if (redelim != '\0') {
c = redelim;
redelim = 0;
catterm = 0;
savetoken = c;
c = lexlast = lexregexp(c);
goto out;
} else while ((c = lexgetc()) != WEOF) {
if (iswalpha(c) || c == '_') {
c = lexid(c);
} else if (iswdigit(c) || c == '.') {
c = lexnumber(c);
} else if (isWblank(c)) {
continue;
} else switch (c) {
#if DOS || OS2
case 032: /* ^Z */
continue;
#endif
case '"':
c = lexstring(c);
break;
case '#':
while ((c = lexgetc()) != '\n' && c != WEOF)
;
lexungetc(c);
continue;
case '+':
if ((c1 = lexgetc()) == '+')
c = INC;
else if (c1 == '=')
c = AADD;
else
lexungetc(c1);
break;
case '-':
if ((c1 = lexgetc()) == '-')
c = DEC;
else if (c1 == '=')
c = ASUB;
else
lexungetc(c1);
break;
case '*':
if ((c1 = lexgetc()) == '=')
c = AMUL;
else if (c1 == '*') {
if ((c1 = lexgetc()) == '=')
c = AEXP;
else {
c = EXP;
lexungetc(c1);
}
} else
lexungetc(c1);
break;
case '^':
if ((c1 = lexgetc()) == '=') {
c = AEXP;
} else {
c = EXP;
lexungetc(c1);
}
break;
case '/':
if ((c1 = lexgetc()) == '=' &&
lexlast != RE && lexlast != NRE &&
lexlast != ';' && lexlast != '\n' &&
lexlast != ',' && lexlast != '(')
c = ADIV;
else
lexungetc(c1);
break;
case '%':
if ((c1 = lexgetc()) == '=')
c = AREM;
else
lexungetc(c1);
break;
case '&':
if ((c1 = lexgetc()) == '&')
c = AND;
else
lexungetc(c1);
break;
case '|':
if ((c1 = lexgetc()) == '|')
c = OR;
else {
lexungetc(c1);
if (inprint)
c = PIPE;
}
break;
case '>':
if ((c1 = lexgetc()) == '=')
c = GE;
else if (c1 == '>')
c = APPEND;
else {
lexungetc(c1);
if (nparen == 0 && inprint)
c = WRITE;
}
break;
case '<':
if ((c1 = lexgetc()) == '=')
c = LE;
else
lexungetc(c1);
break;
case '!':
if ((c1 = lexgetc()) == '=')
c = NE;
else if (c1 == '~')
c = NRE;
else
lexungetc(c1);
break;
case '=':
if ((c1 = lexgetc()) == '=')
c = EQ;
else {
lexungetc(c1);
c = ASG;
}
break;
case '\n':
switch (lexlast) {
case ')':
if (catterm || inprint) {
c = ';';
break;
}
/* FALLTHROUGH */
case AND:
case OR:
case COMMA:
case '{':
case ELSE:
case ';':
case DO:
continue;
case '}':
if (nbrace != 0)
continue;
/* FALLTHROUGH */
default:
c = ';';
break;
}
break;
case ELSE:
if (lexlast != ';') {
savetoken = ELSE;
c = ';';
}
break;
case '(':
++nparen;
break;
case ')':
if (--nparen < 0)
awkerr(unbal, "()");
break;
case '{':
nbrace++;
break;
case '}':
if (--nbrace < 0) {
char brk[3];
brk[0] = '{';
brk[1] = '}';
brk[2] = '\0';
awkerr(unbal, brk);
}
if (lexlast != ';') {
savetoken = c;
c = ';';
}
break;
case '[':
++nbracket;
break;
case ']':
if (--nbracket < 0) {
char brk[3];
brk[0] = '[';
brk[1] = ']';
brk[2] = '\0';
awkerr(unbal, brk);
}
break;
case '\\':
if ((c1 = lexgetc()) == '\n')
continue;
lexungetc(c1);
break;
case ',':
c = COMMA;
break;
case '?':
c = QUEST;
break;
case ':':
c = COLON;
break;
default:
if (!iswprint(c))
awkerr(
gettext("invalid character \"%s\""),
toprint(c));
break;
}
break;
}
switch (c) {
case ']':
++catterm;
break;
case VAR:
if (catterm) {
savetoken = c;
c = CONCAT;
catterm = 0;
} else if (!isfuncdef) {
if ((c1 = lexgetc()) != '(')
++catterm;
lexungetc(c1);
}
isfuncdef = 0;
break;
case PARM:
case CONSTANT:
if (catterm) {
savetoken = c;
c = CONCAT;
catterm = 0;
} else {
if (lexlast == '$')
wasfield = 2;
++catterm;
}
break;
case INC:
case DEC:
if (!catterm || lexlast != CONSTANT || wasfield)
break;
/* FALLTHROUGH */
case UFUNC:
case FUNC:
case GETLINE:
case '!':
case '$':
case '(':
if (catterm) {
savetoken = c;
c = CONCAT;
catterm = 0;
}
break;
case '}':
if (nbrace == 0)
savetoken = ';';
/* FALLTHROUGH */
case ';':
inprint = 0;
/* FALLTHROUGH */
default:
if (c == DEFFUNC)
isfuncdef = 1;
catterm = 0;
}
lexlast = c;
if (wasfield)
wasfield--;
/*
* Map character constants to symbolic names.
*/
for (i = 0; ctosym[i].c != 0; i++)
if (c == ctosym[i].c) {
c = ctosym[i].sym;
break;
}
out:
#ifdef DEBUG
if (dflag)
(void) printf("%d\n", (int)c);
#endif
return ((int)c);
}
