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Distinguish string literals from identifiers in custom syntax parser.

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This commit is contained in:
Stephen Chung
2022-09-24 16:59:01 +08:00
parent f2b1184805
commit def1a683ef
4 changed files with 26 additions and 14 deletions
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28
tests/custom_syntax.rs
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@@ -256,10 +256,18 @@ fn test_custom_syntax_raw() -> Result<(), Box<EvalAltResult>> {
engine.register_custom_syntax_with_state_raw(
"hello",
|stream, _, state| match stream.len() {
|stream, look_ahead, state| match stream.len() {
0 => unreachable!(),
1 => Ok(Some("$ident$".into())),
1 if look_ahead == "\"world\"" => {
*state = Dynamic::TRUE;
Ok(Some("$string$".into()))
}
1 => {
*state = Dynamic::FALSE;
Ok(Some("$ident$".into()))
}
2 => match stream[1].as_str() {
"world" if state.as_bool().unwrap_or(false) => Ok(Some("$$world".into())),
"world" => Ok(Some("$$hello".into())),
"kitty" => {
*state = (42 as INT).into();
@@ -276,16 +284,11 @@ fn test_custom_syntax_raw() -> Result<(), Box<EvalAltResult>> {
context.scope_mut().push("foo", 999 as INT);
Ok(match inputs[0].get_string_value().unwrap() {
"world"
if inputs
.last()
.unwrap()
.get_string_value()
.map_or(false, |s| s == "$$hello") =>
{
0 as INT
}
"world" => 123 as INT,
"world" => match inputs.last().unwrap().get_string_value().unwrap_or("") {
"$$hello" => 0 as INT,
"$$world" => 123456 as INT,
_ => 123 as INT,
},
"kitty" if inputs.len() > 1 => 999 as INT,
"kitty" => state.as_int().unwrap(),
_ => unreachable!(),
@@ -294,6 +297,7 @@ fn test_custom_syntax_raw() -> Result<(), Box<EvalAltResult>> {
},
);
assert_eq!(engine.eval::<INT>(r#"hello "world""#)?, 123456);
assert_eq!(engine.eval::<INT>("hello world")?, 0);
assert_eq!(engine.eval::<INT>("hello kitty")?, 42);
assert_eq!(