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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14
README.md
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@@ -60,13 +60,19 @@ Matteeeo result // prints 15
This command executes a block of code if a condition is true. The supported operators are `==`, `!=`, `>`, `<`, `>=`, `<=`. 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: Example:
```tralalero ```tralalero
Biscottini x 10 Biscottini x 5
Tung Tung Tung 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"
} }
``` ```
## Ciao! ## Ciao!

12
conditional.tralla
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@@ -1,7 +1,11 @@
Tralalero Tralala Tralalero Tralala
Biscottini x 10 Biscottini x 5
Tung Tung Tung x > 5 Tung Tung Tung x > 10
{ {
Matteeeo "x is greater than 5" Matteeeo "x is greater than 10"
} }
Bombardiro Crocodilo Ballerina Cappuccina
{
Matteeeo "x is not greater than 10"
}
Bombardiro Crocodilo

49
src/main.rs
View File

@@ -122,34 +122,67 @@ fn parse_and_execute(pc: usize, lines: &Vec<&str>, variables: &mut HashMap<Strin
_ => false, _ => false,
}; };
let block_start = pc + 2; let if_block_start = pc + 2;
let mut block_end = block_start; let mut if_block_end = if_block_start;
let mut brace_count = 1; let mut brace_count = 1;
for i in block_start..lines.len() { for i in if_block_start..lines.len() {
if lines[i].trim() == "{" { if lines[i].trim() == "{" {
brace_count += 1; brace_count += 1;
} }
if lines[i].trim() == "}" { if lines[i].trim() == "}" {
brace_count -= 1; brace_count -= 1;
if brace_count == 0 { if brace_count == 0 {
block_end = i; if_block_end = i;
break; break;
} }
} }
} }
let mut next_pc = if_block_end + 1;
if condition { if condition {
let mut inner_pc = block_start; let mut inner_pc = if_block_start;
while inner_pc < block_end { while inner_pc < if_block_end {
inner_pc = parse_and_execute(inner_pc, lines, variables); 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;
}
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 block_end + 1; return next_pc;
} }
} }
} }
} }
} }
pc + 1 pc + 1
} }