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fixed operator precedence issue

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This commit is contained in:
Zander Thannhauser 2025-08-03 23:13:33 -05:00
parent dbd3ff2acd
commit 8e5675a53f
1 changed files with 145 additions and 132 deletions
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239
main.c
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@ -766,133 +766,182 @@ struct expression* parse(const char* text)
{ {
struct expression* parse_comparision(void) struct expression* parse_comparision(void)
{ {
struct expression* parse_arithmetic(void) struct expression* parse_additive(void)
{ {
struct expression* parse_prefix(void) struct expression* parse_multiplicative(void)
{ {
struct expression* parse_primary(void) struct expression* parse_prefix(void)
{ {
struct expression* retval; struct expression* parse_primary(void)
switch (tokenkind)
{ {
case tk_identifier: struct expression* retval;
switch (tokenkind)
{ {
struct string* name = case tk_identifier:
new_string(buffer.data); {
struct string* name =
new_string(buffer.data);
retval = new_variable_expression(name); retval = new_variable_expression(name);
next_token(); next_token();
free_string(name); free_string(name);
break; break;
} }
case tk_literal: case tk_literal:
{ {
struct value* value = struct value* value =
scan(buffer.data); scan(buffer.data);
retval = new_literal_expression(value); retval = new_literal_expression(value);
next_token(); next_token();
free_value(value); free_value(value);
break; break;
} }
case tk_oparen: case tk_oparen:
{ {
next_token(); next_token();
retval = parse_root(); retval = parse_root();
if (tokenkind != tk_cparen) if (tokenkind != tk_cparen)
{
struct string* message =
new_string_from_fmt(
"unexpected '%s'",
tokennames[tokenkind]);
retval = new_syntax_error_expression(message, retval);
free_string(message);
}
next_token();
break;
}
default:
{ {
struct string* message = struct string* message =
new_string_from_fmt( new_string_from_fmt(
"unexpected '%s'", "unexpected '%s'",
tokennames[tokenkind]); tokennames[tokenkind]);
retval = new_syntax_error_expression(message, retval); retval = new_syntax_error_expression(message, NULL);
free_string(message); free_string(message);
break;
} }
}
return retval;
}
switch (tokenkind)
{
case tk_emark:
{
next_token(); next_token();
break;
struct expression* sub =
parse_prefix();
struct expression* retval =
new_logical_not_expression(sub);
free_expression(sub);
return retval;
}
case tk_plus:
{
next_token();
struct expression* sub =
parse_prefix();
struct expression* retval =
new_positive_expression(sub);
free_expression(sub);
return retval;
}
case tk_minus:
{
next_token();
struct expression* sub =
parse_prefix();
struct expression* retval =
new_negative_expression(sub);
free_expression(sub);
return retval;
} }
default: default:
{ return parse_primary();
struct string* message =
new_string_from_fmt(
"unexpected '%s'",
tokennames[tokenkind]);
retval = new_syntax_error_expression(message, NULL);
free_string(message);
break;
}
} }
return retval;
} }
switch (tokenkind) struct expression* left = parse_prefix();
again: switch (tokenkind)
{ {
case tk_emark: case tk_asterisk:
{ {
next_token(); next_token();
struct expression* sub = struct expression* right =
parse_prefix(); parse_prefix();
struct expression* retval = struct expression* retval =
new_logical_not_expression(sub); new_binary_expression(ek_multiply, left, right);
free_expression(sub); free_expression(left);
free_expression(right);
return retval; left = retval;
goto again;
} }
case tk_plus: case tk_slash:
{ {
next_token(); next_token();
struct expression* sub = struct expression* right =
parse_prefix(); parse_prefix();
struct expression* retval = struct expression* retval =
new_positive_expression(sub); new_binary_expression(ek_divide, left, right);
free_expression(sub); free_expression(left);
free_expression(right);
return retval; left = retval;
}
case tk_minus: goto again;
{
next_token();
struct expression* sub =
parse_prefix();
struct expression* retval =
new_negative_expression(sub);
free_expression(sub);
return retval;
} }
default: default:
return parse_primary(); break;
} }
return left;
} }
struct expression* left = parse_prefix(); struct expression* left = parse_multiplicative();
again: switch (tokenkind) again: switch (tokenkind)
{ {
@ -901,7 +950,7 @@ struct expression* parse(const char* text)
next_token(); next_token();
struct expression* right = struct expression* right =
parse_prefix(); parse_multiplicative();
struct expression* retval = struct expression* retval =
new_binary_expression(ek_add, left, right); new_binary_expression(ek_add, left, right);
@ -919,7 +968,7 @@ struct expression* parse(const char* text)
next_token(); next_token();
struct expression* right = struct expression* right =
parse_prefix(); parse_multiplicative();
struct expression* retval = struct expression* retval =
new_binary_expression(ek_subtract, left, right); new_binary_expression(ek_subtract, left, right);
@ -932,42 +981,6 @@ struct expression* parse(const char* text)
goto again; goto again;
} }
case tk_asterisk:
{
next_token();
struct expression* right =
parse_prefix();
struct expression* retval =
new_binary_expression(ek_multiply, left, right);
free_expression(left);
free_expression(right);
left = retval;
goto again;
}
case tk_slash:
{
next_token();
struct expression* right =
parse_prefix();
struct expression* retval =
new_binary_expression(ek_divide, left, right);
free_expression(left);
free_expression(right);
left = retval;
goto again;
}
default: default:
break; break;
} }
@ -975,7 +988,7 @@ struct expression* parse(const char* text)
return left; return left;
} }
struct expression* left = parse_arithmetic(); struct expression* left = parse_additive();
again: switch (tokenkind) again: switch (tokenkind)
{ {
@ -984,7 +997,7 @@ struct expression* parse(const char* text)
next_token(); next_token();
struct expression* right = struct expression* right =
parse_arithmetic(); parse_additive();
struct expression* retval = struct expression* retval =
new_binary_expression(ek_less_than, left, right); new_binary_expression(ek_less_than, left, right);
@ -1002,7 +1015,7 @@ struct expression* parse(const char* text)
next_token(); next_token();
struct expression* right = struct expression* right =
parse_arithmetic(); parse_additive();
struct expression* retval = struct expression* retval =
new_binary_expression(ek_less_than_equal_to, left, right); new_binary_expression(ek_less_than_equal_to, left, right);
@ -1020,7 +1033,7 @@ struct expression* parse(const char* text)
next_token(); next_token();
struct expression* right = struct expression* right =
parse_arithmetic(); parse_additive();
struct expression* retval = struct expression* retval =
new_binary_expression(ek_greater_than, left, right); new_binary_expression(ek_greater_than, left, right);
@ -1038,7 +1051,7 @@ struct expression* parse(const char* text)
next_token(); next_token();
struct expression* right = struct expression* right =
parse_arithmetic(); parse_additive();
struct expression* retval = struct expression* retval =
new_binary_expression(ek_greater_than_equal_to, left, right); new_binary_expression(ek_greater_than_equal_to, left, right);