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Reserve begin/end.

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This commit is contained in:
Stephen Chung 2020-11-21 15:44:17 +08:00
parent eb4636f219
commit 97368da762
7 changed files with 32 additions and 28 deletions
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2
RELEASES.md
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@ -19,7 +19,7 @@ Breaking changes
----------------
* `Module::set_fn`, `Module::set_raw_fn` and `Module::set_fn_XXX_mut` all take an additional parameter of `FnNamespace`.
* `unless` is now a reserved keyword.
* `begin`, `end`, `unless` are now reserved keywords.
* `EvalPackage` is removed in favor of `Engine::disable_symbol`.
New features

2
doc/src/SUMMARY.md
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@ -97,7 +97,7 @@ The Rhai Scripting Language
19. [Modules](language/modules/index.md)
1. [Export Variables, Functions and Sub-Modules](language/modules/export.md)
2. [Import Modules](language/modules/import.md)
20. [Eval Statement](language/eval.md)
20. [Eval Function](language/eval.md)
6. [Safety and Protection](safety/index.md)
1. [Checked Arithmetic](safety/checked.md)
2. [Sand-Boxing](safety/sandbox.md)

2
doc/src/appendix/keywords.md
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@ -49,6 +49,8 @@ Reserved Keywords
| --------- | --------------------- |
| `var` | variable declaration |
| `static` | variable declaration |
| `begin` | block scope |
| `end` | block scope |
| `shared` | share value |
| `each` | looping |
| `then` | control flow |

2
doc/src/language/eval.md
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@ -1,4 +1,4 @@
`eval` Statement
`eval` Function
===============
{{#include ../links.md}}

13
doc/src/language/keywords.md
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@ -6,13 +6,14 @@ Keywords
The following are reserved keywords in Rhai:
| Active keywords | Reserved keywords | Usage | Inactive under feature |
| ------------------------------------------------- | ---------------------------------------------------------- | ---------------------- | :--------------------: |
| `true`, `false` | | boolean constants | |
| `let`, `const` | `var`, `static` | variable declarations | |
| ---------------------------------------------------------------- | ---------------------------------------------------------- | ---------------------- | :--------------------: |
| `true`, `false` | | constants | |
| `let`, `const` | `var`, `static` | variables | |
| | `begin`, `end` | block scopes | |
| `is_shared` | | shared values | [`no_closure`] |
| `if`, `else` | `then`, `goto`, `exit` | control flow | |
| | `switch`, `match`, `case` | matching | |
| `while`, `loop`, `for`, `in`, `continue`, `break` | `do`, `each` | looping | |
| `if`, `else` | `then`, `unless`, `goto`, `exit` | control flow | |
| `switch` | `match`, `case` | switching and matching | |
| `do`, `while`, `loop`, `until`, `for`, `in`, `continue`, `break` | `each` | looping | |
| `fn`, `private` | `public`, `new` | functions | [`no_function`] |
| `return` | | return values | |
| `throw`, `try`, `catch` | | throw/catch exceptions | |

6
doc/src/language/statements.md
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@ -9,7 +9,7 @@ Terminated by '`;`'
Statements are terminated by semicolons '`;`' and they are mandatory,
except for the _last_ statement in a _block_ (enclosed by '`{`' .. '`}`' pairs) where it can be omitted.
Semicolons can also be omitted if the statement contains a block itself
Semicolons can also be omitted if the statement ends with a block itself
(e.g. the `if`, `while`, `for` and `loop` statements).
```rust
@ -35,6 +35,8 @@ Statement Expression
A statement can be used anywhere where an expression is expected. These are called, for lack of a more
creative name, "statement expressions."
The _last_ statement of a statement block is _always_ the block's return value when used as a statement.
The _last_ statement of a statement block is _always_ the block's return value when used as a statement,
_regardless_ of whether it is terminated by a semicolon or not. This is different from Rust where,
if the last statement is terminated by a semicolon, the block's return value is taken to be `()`.
If the last statement has no return value (e.g. variable definitions, assignments) then it is assumed to be [`()`].

13
src/token.rs
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@ -532,11 +532,10 @@ impl Token {
"import" | "export" | "as" => Reserved(syntax.into()),
"===" | "!==" | "->" | "<-" | ":=" | "::<" | "(*" | "*)" | "#" | "public" | "new"
| "use" | "module" | "package" | "var" | "static" | "shared" | "with" | "each"
| "then" | "goto" | "unless" | "exit" | "match" | "case" | "default" | "void"
| "null" | "nil" | "spawn" | "thread" | "go" | "sync" | "async" | "await" | "yield" => {
Reserved(syntax.into())
}
| "use" | "module" | "package" | "var" | "static" | "begin" | "end" | "shared"
| "with" | "each" | "then" | "goto" | "unless" | "exit" | "match" | "case"
| "default" | "void" | "null" | "nil" | "spawn" | "thread" | "go" | "sync"
| "async" | "await" | "yield" => Reserved(syntax.into()),
KEYWORD_PRINT | KEYWORD_DEBUG | KEYWORD_TYPE_OF | KEYWORD_EVAL | KEYWORD_FN_PTR
| KEYWORD_FN_PTR_CALL | KEYWORD_FN_PTR_CURRY | KEYWORD_IS_DEF_VAR
@ -1670,12 +1669,12 @@ impl<'a> Iterator for TokenIterator<'a, '_> {
"'<-' is not a valid symbol. This is not Go! Should it be '<='?".to_string(),
)),
(":=", false) => Token::LexError(LERR::ImproperSymbol(s,
"':=' is not a valid assignment operator. This is not Go! Should it be simply '='?".to_string(),
"':=' is not a valid assignment operator. This is not Go or Pascal! Should it be simply '='?".to_string(),
)),
("::<", false) => Token::LexError(LERR::ImproperSymbol(s,
"'::<>' is not a valid symbol. This is not Rust! Should it be '::'?".to_string(),
)),
("(*", false) | ("*)", false) => Token::LexError(LERR::ImproperSymbol(s,
("(*", false) | ("*)", false) | ("begin", false) | ("end", false) => Token::LexError(LERR::ImproperSymbol(s,
"'(* .. *)' is not a valid comment format. This is not Pascal! Should it be '/* .. */'?".to_string(),
)),
("#", false) => Token::LexError(LERR::ImproperSymbol(s,