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[ABNF] Require types to avoid type inference.

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Types are now required in variable and constant declarations (including for loop
variables), and for literals (i.e. there are no longer untyped literals).
This commit is contained in:
Alessandro Coglio 2022-03-05 23:52:34 -08:00
parent 8398b3181e
commit 6cbf206f86
2 changed files with 12 additions and 26 deletions
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24
docs/grammar/README.md
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@ -654,16 +654,6 @@ integer = [ "-" ] natural
Go to: _[natural](#user-content-natural)_;
An untyped literal is just an integer.
<a name="untyped-literal"></a>
```abnf
untyped-literal = integer
```
Go to: _[integer](#user-content-integer)_;
Unsigned literals are naturals followed by unsigned types.
<a name="unsigned-literal"></a>
@ -849,8 +839,7 @@ as defined by the following rule.
<a name="atomic-literal"></a>
```abnf
atomic-literal = untyped-literal
/ unsigned-literal
atomic-literal = unsigned-literal
/ signed-literal
/ field-literal
/ product-group-literal
@ -860,7 +849,7 @@ atomic-literal = untyped-literal
/ string-literal
```
Go to: _[address-literal](#user-content-address-literal), [boolean-literal](#user-content-boolean-literal), [character-literal](#user-content-character-literal), [field-literal](#user-content-field-literal), [product-group-literal](#user-content-product-group-literal), [signed-literal](#user-content-signed-literal), [string-literal](#user-content-string-literal), [unsigned-literal](#user-content-unsigned-literal), [untyped-literal](#user-content-untyped-literal)_;
Go to: _[address-literal](#user-content-address-literal), [boolean-literal](#user-content-boolean-literal), [character-literal](#user-content-character-literal), [field-literal](#user-content-field-literal), [product-group-literal](#user-content-product-group-literal), [signed-literal](#user-content-signed-literal), [string-literal](#user-content-string-literal), [unsigned-literal](#user-content-unsigned-literal)_;
After defining the (mostly) alphanumeric tokens above,
@ -1511,7 +1500,7 @@ and just one initializing expression.
<a name="variable-declaration"></a>
```abnf
variable-declaration = %s"let" identifier-or-identifiers [ ":" type ]
variable-declaration = %s"let" identifier-or-identifiers ":" type
"=" expression ";"
```
@ -1520,7 +1509,7 @@ Go to: _[expression](#user-content-expression), [identifier-or-identifiers](#use
<a name="constant-declaration"></a>
```abnf
constant-declaration = %s"const" identifier-or-identifiers [ ":" type ]
constant-declaration = %s"const" identifier-or-identifiers ":" type
"=" expression ";"
```
@ -1566,11 +1555,12 @@ The body is a block.
<a name="loop-statement"></a>
```abnf
loop-statement = %s"for" identifier %s"in" expression ".." [ "=" ] expression
loop-statement = %s"for" identifier ":" type
%s"in" expression ".." [ "=" ] expression
block
```
Go to: _[block](#user-content-block), [expression](#user-content-expression), [identifier](#user-content-identifier)_;
Go to: _[block](#user-content-block), [expression](#user-content-expression), [identifier](#user-content-identifier), [type](#user-content-type)_;
An assignment statement is straightforward.

14
docs/grammar/abnf-grammar.txt
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@ -461,10 +461,6 @@ natural = 1*decimal-digit
integer = [ "-" ] natural
; An untyped literal is just an integer.
untyped-literal = integer
; Unsigned literals are naturals followed by unsigned types.
unsigned-literal = natural ( %s"u8" / %s"u16" / %s"u32" / %s"u64" / %s"u128" )
@ -552,8 +548,7 @@ string-literal-element = not-double-quote-or-backslash
; (in the sense that they are tokens, without whitespace allowed in them),
; as defined by the following rule.
atomic-literal = untyped-literal
/ unsigned-literal
atomic-literal = unsigned-literal
/ signed-literal
/ field-literal
/ product-group-literal
@ -918,10 +913,10 @@ return-statement = %s"return" expression ";"
; in all cases, there is just one optional type
; and just one initializing expression.
variable-declaration = %s"let" identifier-or-identifiers [ ":" type ]
variable-declaration = %s"let" identifier-or-identifiers ":" type
"=" expression ";"
constant-declaration = %s"const" identifier-or-identifiers [ ":" type ]
constant-declaration = %s"const" identifier-or-identifiers ":" type
"=" expression ";"
identifier-or-identifiers = identifier
@ -943,7 +938,8 @@ conditional-statement = branch
; that goes from a starting value (inclusive) to an ending value (exclusive).
; The body is a block.
loop-statement = %s"for" identifier %s"in" expression ".." [ "=" ] expression
loop-statement = %s"for" identifier ":" type
%s"in" expression ".." [ "=" ] expression
block
; An assignment statement is straightforward.