alvin/Tralalero_lang
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feat: Implement else statements

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Alvin
2025-09-10 12:55:26 +02:00
parent 936fa22257
commit 1cf708d0fd
3 changed files with 59 additions and 16 deletions
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12
README.md
View File

@@ -60,12 +60,18 @@ Matteeeo result // prints 15
This command executes a block of code if a condition is true. The supported operators are `==`, `!=`, `>`, `<`, `>=`, `<=`.
This can be followed by a `Ballerina Cappuccina` block to execute code if the condition is false.
Example:
```tralalero
Biscottini x 10
Tung Tung Tung x > 5
Biscottini x 5
Tung Tung Tung x > 10
{
Matteeeo "x is greater than 5"
Matteeeo "x is greater than 10"
}
Ballerina Cappuccina
{
Matteeeo "x is not greater than 10"
}
```

10
conditional.tralla
View File

@@ -1,7 +1,11 @@
Tralalero Tralala
Biscottini x 10
Tung Tung Tung x > 5
Biscottini x 5
Tung Tung Tung x > 10
{
Matteeeo "x is greater than 5"
Matteeeo "x is greater than 10"
}
Ballerina Cappuccina
{
Matteeeo "x is not greater than 10"
}
Bombardiro Crocodilo

47
src/main.rs
View File

@@ -122,30 +122,63 @@ fn parse_and_execute(pc: usize, lines: &Vec<&str>, variables: &mut HashMap<Strin
_ => false,
};
let block_start = pc + 2;
let mut block_end = block_start;
let if_block_start = pc + 2;
let mut if_block_end = if_block_start;
let mut brace_count = 1;
for i in block_start..lines.len() {
for i in if_block_start..lines.len() {
if lines[i].trim() == "{" {
brace_count += 1;
}
if lines[i].trim() == "}" {
brace_count -= 1;
if brace_count == 0 {
block_end = i;
if_block_end = i;
break;
}
}
}
let mut next_pc = if_block_end + 1;
if condition {
let mut inner_pc = block_start;
while inner_pc < block_end {
let mut inner_pc = if_block_start;
while inner_pc < if_block_end {
inner_pc = parse_and_execute(inner_pc, lines, variables);
}
} else {
// Check for an else block
if let Some(next_line) = lines.get(if_block_end + 1) {
let mut next_words = next_line.trim().split_whitespace();
if let Some(else_keyword) = next_words.next() {
if else_keyword == "Ballerina" && next_words.next() == Some("Cappuccina") {
let else_block_start = if_block_end + 3;
let mut else_block_end = else_block_start;
let mut brace_count = 1;
for i in else_block_start..lines.len() {
if lines[i].trim() == "{" {
brace_count += 1;
}
return block_end + 1;
if lines[i].trim() == "}" {
brace_count -= 1;
if brace_count == 0 {
else_block_end = i;
break;
}
}
}
let mut inner_pc = else_block_start;
while inner_pc < else_block_end {
inner_pc = parse_and_execute(inner_pc, lines, variables);
}
next_pc = else_block_end + 1;
}
}
}
}
return next_pc;
}
}
}