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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
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}}

33
doc/src/language/keywords.md
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@@ -5,21 +5,22 @@ 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 | |
| `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 | |
| `fn`, `private` | `public`, `new` | functions | [`no_function`] |
| `return` | | return values | |
| `throw`, `try`, `catch` | | throw/catch exceptions | |
| `import`, `export`, `as` | `use`, `with`, `module`, `package` | modules/packages | [`no_module`] |
| `Fn`, `call`, `curry` | | function pointers | |
| | `spawn`, `thread`, `go`, `sync`, `async`, `await`, `yield` | threading/async | |
| `type_of`, `print`, `debug`, `eval` | | special functions | |
| | `default`, `void`, `null`, `nil` | special values | |
| Active keywords | Reserved keywords | Usage | Inactive under feature |
| ---------------------------------------------------------------- | ---------------------------------------------------------- | ---------------------- | :--------------------: |
| `true`, `false` | | constants | |
| `let`, `const` | `var`, `static` | variables | |
| | `begin`, `end` | block scopes | |
| `is_shared` | | shared values | [`no_closure`] |
| `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 | |
| `import`, `export`, `as` | `use`, `with`, `module`, `package` | modules/packages | [`no_module`] |
| `Fn`, `call`, `curry` | | function pointers | |
| | `spawn`, `thread`, `go`, `sync`, `async`, `await`, `yield` | threading/async | |
| `type_of`, `print`, `debug`, `eval` | | special functions | |
| | `default`, `void`, `null`, `nil` | special values | |
Keywords cannot become the name of a [function] or [variable], even when they are disabled.

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 [`()`].