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apple2a
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Add REM and semicolon at end of PRINT.

This commit is contained in:
Lawrence Kesteloot 2018-08-07 16:31:41 -07:00
parent f7f58ded19
commit 11721a4e58
2 changed files with 13 additions and 20 deletions
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4
README.md
View File

@ -6,12 +6,12 @@ Runs between 5 and 30 times faster.
Supported features: The classic way to enter programs with
line numbers, 16-bit integer variables, `HOME`, `PRINT`, `IF/THEN`,
`FOR/NEXT`, `GOTO`, low-res graphics (`GR`, `PLOT`, `COLOR=`, `TEXT`),
`FOR/NEXT`, `GOTO`, low-res graphics (`GR`, `PLOT`, `COLOR=`, `TEXT`), `REM`,
`DIM` (single-dimensional arrays), `POKE`, and integer and boolean arithmetic.
Not supported: Floating point, strings,
high-res graphics, `DATA/READ/RESUME`, `GOSUB/RETURN/POP`,
`REM`, multi-dimensional arrays, keyboard input, exponentiation (`A^B`), and cassette I/O.
multi-dimensional arrays, keyboard input, exponentiation (`A^B`), and cassette I/O.
# Dependencies

29
main.c
View File

@ -63,6 +63,7 @@ uint8_t title_length = 9;
#define T_NEXT 0x9A
#define T_NOT 0x9B
#define T_DIM 0x9C
#define T_REM 0x9D
// Operators. These encode both the operator (high nybble) and the precedence
// (low nybble). Lower precedence has a lower low nybble value. For example,
@ -162,6 +163,7 @@ static uint8_t *TOKEN[] = {
"NEXT",
"NOT",
"DIM",
"REM",
};
static int16_t TOKEN_COUNT = sizeof(TOKEN)/sizeof(TOKEN[0]);
@ -1053,7 +1055,12 @@ static void compile_buffer(uint8_t *buffer, uint16_t line_number) {
add_call(print_int);
}
add_call(print_newline);
if (*s == ';') {
// Ends with a semicolon, don't print newline.
s += 1;
} else {
add_call(print_newline);
}
} else if (*s == T_LIST) {
s += 1;
add_call(list_statement);
@ -1327,6 +1334,9 @@ static void compile_buffer(uint8_t *buffer, uint16_t line_number) {
break;
}
}
} else if (*s == T_REM) {
// Done with line.
break;
} else if (*s == T_GR) {
s += 1;
add_call(gr_statement);
@ -1595,23 +1605,6 @@ int16_t main(void)
// Initialize UI.
home();
// Display the character set.
/*
if (1) {
int16_t i;
for (i = 0; i < 256; i++) {
uint8_t *loc;
// Fails with: unhandled instruction B2
move_cursor(i % 16, i >> 4);
// Works.
// move_cursor(i & 0x0F, i >> 4);
loc = cursor_pos();
*loc = i;
}
while(1);
}
*/
// Print title.
move_cursor((40 - title_length) / 2, 0);
print(title);