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Extend numeric operations to constant operations

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- Besides decNums and hexNums, characters are also valid
This commit is contained in:
raymon
2021-12-30 23:27:30 +01:00
committed by Raymon Zutekouw
parent 764b2d17b9
commit 226873e71c
2 changed files with 24 additions and 19 deletions
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src/main.rs
+17 -14
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@@ -36,8 +36,11 @@ fn extract_operand(statement: Pair<Rule>) -> &str {
line
}
fn parse_num(text: &str) -> Result<i32, std::num::ParseIntError> {
if text.starts_with("0x") {
fn parse_constant(text: &str) -> Result<i32, std::num::ParseIntError> {
if text.starts_with("\"") {
let c = text.chars().nth(1).unwrap();
Ok(c as i32)
} else if text.starts_with("0x") {
let without_prefix = text.trim_start_matches("0x");
i32::from_str_radix(without_prefix, 16)
} else {
@@ -68,20 +71,20 @@ fn instruct(statement: Pair<Rule>, out: &mut Builder) {
out.append("pointm\n");
}
Rule::add => {
let number = extract_operand(statement);
let number_parsed = parse_num(number).unwrap();
let constant = extract_operand(statement);
let constant_parsed = parse_constant(constant).unwrap();
println!(
"Addition of '{}', decimal value is {}",
number, number_parsed
constant, constant_parsed
);
out.append("add\n");
}
Rule::addb => {
let number = extract_operand(statement);
let number_parsed = parse_num(number).unwrap();
let constant = extract_operand(statement);
let constant_parsed = parse_constant(constant).unwrap();
println!(
"Big Addition of '{}', decimal value is {}",
number, number_parsed
constant, constant_parsed
);
out.append("addb\n");
}
@@ -91,20 +94,20 @@ fn instruct(statement: Pair<Rule>, out: &mut Builder) {
out.append("addv\n");
}
Rule::sub => {
let number = extract_operand(statement);
let number_parsed = parse_num(number).unwrap();
let constant = extract_operand(statement);
let constant_parsed = parse_constant(constant).unwrap();
println!(
"Subtraction of '{}', decimal value is {}",
number, number_parsed
constant, constant_parsed
);
out.append("sub\n");
}
Rule::subb => {
let number = extract_operand(statement);
let number_parsed = parse_num(number).unwrap();
let constant = extract_operand(statement);
let constant_parsed = parse_constant(constant).unwrap();
println!(
"Big Subtraction of '{}', decimal value is {}",
number, number_parsed
constant, constant_parsed
);
out.append("subb\n");
}