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compiler: impl syntax error detect for global kind

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This commit fixes `test_global_parap_err_first` test in
[test_syntax.py](https://github.com/RustPython/RustPython/blob/master/Lib/test/test_syntax.py#L678) and implement the other syntax errors detection as cpython 3.8 provided for global symbol.

Below syntax error conditions are added.
* name {} is parameter and global
```python
>>>>> def test(a):
.....   global a
.....
SyntaxError: name 'a' is parameter and global at line 2 column 2
        global a
```
* annotated name {} can't be global
```python
>>>>> def test():
.....   a: int
.....   global a
.....
SyntaxError: annotated name 'a' can't be global at line 3 column 2
        global a
```
* name {} is assigned to before global description
```python
>>>>> a = 100
>>>>> def test():
.....   a = 10
.....   global a
.....
SyntaxError: name 'a' is assigned to before global declaration at line 3 column 2
        global a
```
* name {} is used prior to global declaration
```python
>>>>> a = 10
>>>>> def test():
.....   print(a)
.....   global a
.....
SyntaxError: name 'a' is used prior to global declaration at line 3 column 2
        global a
```

Signed-off-by: snowapril <sinjihng@gmail.com>
This commit is contained in:
snowapril 2021-08-17 19:58:37 +09:00
parent 9b0a82aed3
commit 0383dede81
1 changed files with 22 additions and 1 deletions
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23
src/symboltable.rs
View file

@ -1120,12 +1120,33 @@ impl SymbolTableBuilder {
// Role already set..
match role {
SymbolUsage::Global => {
if !symbol.is_global() {
if symbol.is_parameter {
return Err(SymbolTableError {
error: format!("name '{}' is parameter and global", name),
location,
});
}
if symbol.is_referenced {
return Err(SymbolTableError {
error: format!("name '{}' is used prior to global declaration", name),
location,
});
}
if symbol.is_annotated {
return Err(SymbolTableError {
error: format!("annotated name '{}' can't be global", name),
location,
});
}
if symbol.is_assigned {
return Err(SymbolTableError {
error: format!(
"name '{}' is assigned to before global declaration",
name
),
location,
});
}
}
SymbolUsage::Nonlocal => {
if symbol.is_parameter {