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Add hard-coded print statement.

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This commit is contained in:
Lawrence Kesteloot 2018-07-31 23:19:15 -07:00
parent 655b397d86
commit 3260180fb7
1 changed files with 18 additions and 7 deletions
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25
main.c
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@ -109,6 +109,10 @@ static void print(unsigned char *s) {
} }
} }
static void print_statement() {
print("Hello world!\n");
}
/** /**
* If a starts with string b, returns the position in a after b. Else returns null. * If a starts with string b, returns the position in a after b. Else returns null.
*/ */
@ -175,7 +179,7 @@ static void process_input_buffer() {
char done; char done;
input_buffer[input_buffer_length] = '\0'; input_buffer[input_buffer_length] = '\0';
s = skip_whitespace(input_buffer); s = input_buffer;
// Compile the line of BASIC. // Compile the line of BASIC.
binary_length = 0; binary_length = 0;
@ -186,25 +190,32 @@ static void process_input_buffer() {
// Default to being done after one command. // Default to being done after one command.
done = 1; done = 1;
if (*s == '\0') { s = skip_whitespace(s);
// Nothing. if (*s == '\0' || *s == ':') {
// Empty statement.
} else if ((after = skip_over(s, "HOME")) != 0) { } else if ((after = skip_over(s, "HOME")) != 0) {
s = after;
add_call(home); add_call(home);
} else if ((after = skip_over(s, "PRINT")) != 0) {
s = after;
// TODO: Parse expression.
add_call(print_statement);
} else { } else {
error = 1; error = 1;
} }
// Now we're at the end of our instruction. // Now we're at the end of our statement.
if (!error) { if (!error) {
s = skip_whitespace(after); s = skip_whitespace(s);
if (*s == ':') { if (*s == ':') {
// Skip colon. // Skip colon.
s += 1; s += 1;
// Next instruction. // Next statement.
done = 0; done = 0;
} else if (*s != '\0') { } else if (*s != '\0') {
// Junk at the end of the instruction. // Junk at the end of the statement.
error = 1; error = 1;
} }
} }