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Added an alternative (C-style) assignment operator

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This commit is contained in:
NovaRain
2020-01-08 16:17:46 +08:00
parent bdb092d9fb
commit c9c1043a8c
1 changed files with 53 additions and 44 deletions
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lex.c
+53 -44
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@@ -291,6 +291,11 @@ static int expect(int what, int hit, int miss) {
else { ungetChar(); return miss; }
}
/* added for alternative assignment operator '=' */
static int expectAssign(int what, int hit, int miss) {
return (getChar() == what) ? hit : miss;
}
static int validSymbolChar(int c) {
return (c >= 'a' && c <= 'z') ||
(c >= 'A' && c <= 'Z') ||
@@ -674,59 +679,63 @@ top:
ret = T_CONSTANT;
break;
/* added for alternative assignment operator '=' */
#define EXPECT_ASSIGN(c, x, y, z) case x: ret = expectAssign(x, y, z); break;
EXPECT_ASSIGN('=', '=', T_EQUAL, T_ASSIGN);
#define EXPECT(x, y, z) case x: ret = expect(y, z, x); break;
EXPECT(':', '=', T_ASSIGN);
EXPECT('=', '=', T_EQUAL);
// EXPECT('=', '=', T_EQUAL);
EXPECT('>', '=', T_GREATER_EQUAL);
EXPECT('<', '=', T_LESS_EQUAL);
EXPECT('!', '=', T_NOT_EQUAL);
case '+':
if(expect('=', T_ASSIGN_ADD, 0)) ret=T_ASSIGN_ADD;
else if(expect('+', T_INC, 0)) ret=T_INC;
else ret='+';
break;
case '-':
if (expect('=', T_ASSIGN_SUB, 0)) ret=T_ASSIGN_SUB;
else if (expect('-', T_DEC, 0)) ret=T_DEC;
/*else {
int c = getChar();
if (validNumberChar(c)) {
ungetChar();
parseNumber();
if (lexData.type == T_FLOAT)
lexData.floatData = -lexData.floatData;
else
lexData.intData = -lexData.intData;
ret = T_CONSTANT;
} else {
ungetChar();
ret='-';
}
}*/
else ret='-';
break;
EXPECT('*', '=', T_ASSIGN_MUL);
case '{': case '}':
case '(': case ')':
case ';': case ',': case '%':
case '^': // sfall
case '[': case ']':
ret = c;
break;
case '@':
if(expect('"', 1, 0)) {
parseString(buf[which], 1);
ret = T_CONSTANT;
case '+':
if (expect('=', T_ASSIGN_ADD, 0)) ret = T_ASSIGN_ADD;
else if (expect('+', T_INC, 0)) ret = T_INC;
else ret = '+';
break;
} else {
case '-':
if (expect('=', T_ASSIGN_SUB, 0)) ret = T_ASSIGN_SUB;
else if (expect('-', T_DEC, 0)) ret = T_DEC;
/*else {
int c = getChar();
if (validNumberChar(c)) {
ungetChar();
parseNumber();
if (lexData.type == T_FLOAT)
lexData.floatData = -lexData.floatData;
else
lexData.intData = -lexData.intData;
ret = T_CONSTANT;
} else {
ungetChar();
ret='-';
}
}*/
else ret='-';
break;
EXPECT('*', '=', T_ASSIGN_MUL);
case '{': case '}':
case '(': case ')':
case ';': case ',': case '%':
case '^': // sfall
case '[': case ']':
ret = c;
break;
}
default:
i = 0;
case '@':
if(expect('"', 1, 0)) {
parseString(buf[which], 1);
ret = T_CONSTANT;
break;
} else {
ret = c;
break;
}
default:
i = 0;
do {
buf[which][i++] = c;