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Add constant NO_POS.

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This commit is contained in:
Stephen Chung
2020-11-02 12:50:27 +08:00
parent 6f3ce96d9d
commit d7d6f74dfd
29 changed files with 253 additions and 292 deletions
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22
doc/src/engine/custom-syntax.md
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@@ -294,9 +294,8 @@ engine.register_custom_syntax_raw(
"update" | "check" | "add" | "remove" => Ok(Some("$ident$".to_string())),
"cleanup" => Ok(None),
cmd => Err(ParseError(Box::new(ParseErrorType::BadInput(
format!("Improper command: {}", cmd))),
Position::none(),
)),
LexError::ImproperSymbol(format!("Improper command: {}", cmd))
)), NO_POS)),
},
// perform command arg ...
3 => match (stream[1].as_str(), stream[2].as_str()) {
@@ -308,9 +307,10 @@ engine.register_custom_syntax_raw(
("add", arg) => Ok(None),
("remove", arg) => Ok(None),
(cmd, arg) => Err(ParseError(Box::new(ParseErrorType::BadInput(
format!("Invalid argument for command {}: {}", cmd, arg))),
Position::none(),
)),
LexError::ImproperSymbol(
format!("Invalid argument for command {}: {}", cmd, arg)
)
)), NO_POS)),
},
_ => unreachable!(),
},
@@ -335,8 +335,8 @@ where:
The return value is `Result<Option<String>, ParseError>` where:
| Value | Description |
| ------------------ | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `Ok(None)` | parsing complete and there are no more symbols to match |
| `Ok(Some(symbol))` | next symbol to match, which can also be `"$expr$"`, `"$ident$"` or `"$block$"` |
| `Err(ParseError)` | error that is reflected back to the [`Engine`].<br/>Normally this is `ParseError(ParseErrorType::BadInput(message), Position::none())` to indicate that there is a syntax error, but it can be any `ParseError`. |
| Value | Description |
| ------------------ | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `Ok(None)` | parsing complete and there are no more symbols to match |
| `Ok(Some(symbol))` | next symbol to match, which can also be `"$expr$"`, `"$ident$"` or `"$block$"` |
| `Err(ParseError)` | error that is reflected back to the [`Engine`].<br/>Normally this is `ParseError(ParseErrorType::BadInput(LexError::ImproperSymbol(message)), NO_POS)` to indicate that there is a syntax error, but it can be any `ParseError`. |

14
doc/src/engine/var.md
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@@ -21,11 +21,11 @@ engine.on_var(|name, index, context| {
"MYSTIC_NUMBER" => Ok(Some((42 as INT).into())),
// Override a variable - make it not found even if it exists!
"DO_NOT_USE" => Err(Box::new(
EvalAltResult::ErrorVariableNotFound(name.to_string(), Position::none())
EvalAltResult::ErrorVariableNotFound(name.to_string(), NO_POS)
)),
// Silently maps 'chameleon' into 'innocent'.
"chameleon" => context.scope.get_value("innocent").map(Some).ok_or_else(|| Box::new(
EvalAltResult::ErrorVariableNotFound(name.to_string(), Position::none())
EvalAltResult::ErrorVariableNotFound(name.to_string(), NO_POS)
)),
// Return Ok(None) to continue with the normal variable resolution process.
_ => Ok(None)
@@ -82,8 +82,8 @@ where:
The return value is `Result<Option<Dynamic>, Box<EvalAltResult>>` where:
| Value | Description |
| ------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| `Ok(None)` | normal variable resolution process should continue, i.e. continue searching through the [`Scope`] |
| `Ok(Some(Dynamic))` | value of the variable, treated as a constant |
| `Err(Box<EvalAltResult>)` | error that is reflected back to the [`Engine`].<br/>Normally this is `EvalAltResult::ErrorVariableNotFound(var_name, Position::none())` to indicate that the variable does not exist, but it can be any `EvalAltResult`. |
| Value | Description |
| ------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `Ok(None)` | normal variable resolution process should continue, i.e. continue searching through the [`Scope`] |
| `Ok(Some(Dynamic))` | value of the variable, treated as a constant |
| `Err(Box<EvalAltResult>)` | error that is reflected back to the [`Engine`].<br/>Normally this is `EvalAltResult::ErrorVariableNotFound(var_name, NO_POS)` to indicate that the variable does not exist, but it can be any `EvalAltResult`. |