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restore invariatns

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This commit is contained in:
Aleksey Kladov 2021-12-29 20:37:08 +03:00
parent b5369927d7
commit 2f3237912d
2 changed files with 25 additions and 10 deletions
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29
crates/parser/src/tests/entries.rs
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@ -1,4 +1,4 @@
use crate::{LexedStr, PrefixEntryPoint, StrStep};
use crate::{LexedStr, PrefixEntryPoint, Step};
#[test]
fn vis() {
@ -30,12 +30,25 @@ fn stmt() {
fn check_prefix(entry: PrefixEntryPoint, input: &str, prefix: &str) {
let lexed = LexedStr::new(input);
let input = lexed.to_input();
let output = entry.parse(&input);
let mut buf = String::new();
lexed.intersperse_trivia(&output, &mut |step| match step {
StrStep::Token { kind: _, text } => buf.push_str(text),
_ => (),
});
assert_eq!(buf.trim(), prefix)
let mut n_tokens = 0;
for step in entry.parse(&input).iter() {
match step {
Step::Token { n_input_tokens, .. } => n_tokens += n_input_tokens as usize,
Step::Enter { .. } | Step::Exit | Step::Error { .. } => (),
}
}
let mut i = 0;
loop {
if n_tokens == 0 {
break;
}
if !lexed.kind(i).is_trivia() {
n_tokens -= 1;
}
i += 1;
}
let buf = &lexed.as_str()[..lexed.text_start(i)];
assert_eq!(buf, prefix);
}