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better parser build experience

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This commit is contained in:
Jeong YunWon 2022-09-21 16:47:06 +09:00
parent 307bc46d74
commit 2bef1f02d2
1 changed files with 30 additions and 20 deletions
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42
parser/build.rs
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@ -16,22 +16,26 @@ fn main() -> anyhow::Result<()> {
Ok(()) Ok(())
} }
fn requires_lalrpop(source: &str, target: &str) -> bool { fn requires_lalrpop(source: &str, target: &str) -> Option<String> {
let target = if let Ok(target) = File::open(target) { let target = if let Ok(target) = File::open(target) {
target target
} else { } else {
println!("cargo:warning=python.rs doesn't exist. regenerate."); return Some("python.rs doesn't exist. regenerate.".to_owned());
return true;
}; };
let sha_prefix = "// sha3: "; let sha_prefix = "// sha3: ";
let sha3_line = BufReader::with_capacity(128, target) let sha3_line = if let Some(sha3_line) =
BufReader::with_capacity(128, target)
.lines() .lines()
.find_map(|line| { .find_map(|line| {
let line = line.unwrap(); let line = line.unwrap();
line.starts_with(sha_prefix).then_some(line) line.starts_with(sha_prefix).then_some(line)
}) }) {
.expect("no sha3 line?"); sha3_line
} else {
// no sha3 line - maybe old version of lalrpop installed
return Some("python.rs doesn't include sha3 hash. regenerate.".to_owned());
};
let expected_sha3_str = sha3_line.strip_prefix(sha_prefix).unwrap(); let expected_sha3_str = sha3_line.strip_prefix(sha_prefix).unwrap();
let actual_sha3 = { let actual_sha3 = {
@ -55,29 +59,35 @@ fn requires_lalrpop(source: &str, target: &str) -> bool {
}; };
let eq = sha_equal(expected_sha3_str, &actual_sha3); let eq = sha_equal(expected_sha3_str, &actual_sha3);
if !eq { if !eq {
println!("cargo:warning=python.rs hash expected: {expected_sha3_str}");
let mut actual_sha3_str = String::new(); let mut actual_sha3_str = String::new();
for byte in actual_sha3 { for byte in actual_sha3 {
write!(actual_sha3_str, "{byte:02x}").unwrap(); write!(actual_sha3_str, "{byte:02x}").unwrap();
} }
println!("cargo:warning=python.rs hash actual: {actual_sha3_str}"); return Some(format!(
"python.rs hash expected: {expected_sha3_str} but actual: {actual_sha3_str}"
));
} }
!eq None
} }
fn try_lalrpop(source: &str, target: &str) -> anyhow::Result<()> { fn try_lalrpop(source: &str, target: &str) -> anyhow::Result<()> {
if !requires_lalrpop(source, target) { let _message = if let Some(msg) = requires_lalrpop(source, target) {
msg
} else {
return Ok(()); return Ok(());
} };
#[cfg(feature = "lalrpop")] #[cfg(feature = "lalrpop")]
{ lalrpop::process_root().unwrap_or_else(|e| {
lalrpop::process_root().expect("running lalrpop failed"); println!("cargo:warning={_message}");
Ok(()) panic!("running lalrpop failed. {e:?}");
} });
#[cfg(not(feature = "lalrpop"))] #[cfg(not(feature = "lalrpop"))]
panic!("try: cargo build --manifest-path=compiler/parser/Cargo.toml --features=lalrpop"); {
println!("cargo:warning=try: cargo build --manifest-path=compiler/parser/Cargo.toml --features=lalrpop");
}
Ok(())
} }
fn sha_equal(expected_sha3_str: &str, actual_sha3: &[u8; 32]) -> bool { fn sha_equal(expected_sha3_str: &str, actual_sha3: &[u8; 32]) -> bool {