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checker: clean up checking optional and result in checker.v (#15817)

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yuyi 2022-09-19 19:52:27 +08:00 committed by GitHub
parent 84bc170720
commit a0d647d1e3
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2 changed files with 37 additions and 20 deletions
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55
vlib/v/checker/checker.v
View File

@ -934,7 +934,7 @@ pub fn (mut c Checker) check_expr_opt_call(expr ast.Expr, ret_type ast.Type) ast
} else {
c.check_or_expr(expr.or_block, ret_type, expr.return_type)
}
return ret_type.clear_flag(.optional)
return ret_type.clear_flag(.optional).clear_flag(.result)
} else if expr.or_block.kind == .block {
c.error('unexpected `or` block, the function `$expr.name` does neither return an optional nor a result',
expr.or_block.pos)
@ -942,7 +942,7 @@ pub fn (mut c Checker) check_expr_opt_call(expr ast.Expr, ret_type ast.Type) ast
c.error('unexpected `?`, the function `$expr.name` does not return an optional',
expr.or_block.pos)
} else if expr.or_block.kind == .propagate_result {
c.error('unexpected `!`, the function `$expr.name` does not return an optional',
c.error('unexpected `!`, the function `$expr.name` does not return a result',
expr.or_block.pos)
}
} else if expr is ast.IndexExpr {
@ -1003,7 +1003,7 @@ fn (mut c Checker) check_or_last_stmt(stmt ast.Stmt, ret_type ast.Type, expr_ret
match stmt {
ast.ExprStmt {
c.expected_type = ret_type
c.expected_or_type = ret_type.clear_flag(.optional)
c.expected_or_type = ret_type.clear_flag(.optional).clear_flag(.result)
last_stmt_typ := c.expr(stmt.expr)
c.expected_or_type = ast.void_type
type_fits := c.check_types(last_stmt_typ, ret_type)
@ -1024,12 +1024,12 @@ fn (mut c Checker) check_or_last_stmt(stmt ast.Stmt, ret_type ast.Type, expr_ret
}
return
}
expected_type_name := c.table.type_to_str(ret_type.clear_flag(.optional))
expected_type_name := c.table.type_to_str(ret_type.clear_flag(.optional).clear_flag(.result))
c.error('`or` block must provide a default value of type `$expected_type_name`, or return/continue/break or call a [noreturn] function like panic(err) or exit(1)',
stmt.expr.pos())
} else {
type_name := c.table.type_to_str(last_stmt_typ)
expected_type_name := c.table.type_to_str(ret_type.clear_flag(.optional))
expected_type_name := c.table.type_to_str(ret_type.clear_flag(.optional).clear_flag(.result))
c.error('wrong return type `$type_name` in the `or {}` block, expected `$expected_type_name`',
stmt.expr.pos())
}
@ -1043,7 +1043,7 @@ fn (mut c Checker) check_or_last_stmt(stmt ast.Stmt, ret_type ast.Type, expr_ret
}
ast.Return {}
else {
expected_type_name := c.table.type_to_str(ret_type.clear_flag(.optional))
expected_type_name := c.table.type_to_str(ret_type.clear_flag(.optional).clear_flag(.result))
c.error('last statement in the `or {}` block should be an expression of type `$expected_type_name` or exit parent scope',
stmt.pos)
}
@ -1149,10 +1149,14 @@ pub fn (mut c Checker) selector_expr(mut node ast.SelectorExpr) ast.Type {
return ast.void_type
}
node.expr_type = typ
if node.expr_type.has_flag(.optional) && !(node.expr is ast.Ident
&& (node.expr as ast.Ident).kind == .constant) {
c.error('cannot access fields of an optional, handle the error with `or {...}` or propagate it with `?`',
node.pos)
if !(node.expr is ast.Ident && (node.expr as ast.Ident).kind == .constant) {
if node.expr_type.has_flag(.optional) {
c.error('cannot access fields of an optional, handle the error with `or {...}` or propagate it with `?`',
node.pos)
} else if node.expr_type.has_flag(.result) {
c.error('cannot access fields of a result, handle the error with `or {...}` or propagate it with `!`',
node.pos)
}
}
field_name := node.field_name
sym := c.table.sym(typ)
@ -2388,6 +2392,8 @@ pub fn (mut c Checker) cast_expr(mut node ast.CastExpr) ast.Type {
if to_type.has_flag(.optional) {
c.error('casting to optional type is forbidden', node.pos)
} else if to_type.has_flag(.result) {
c.error('casting to result type is forbidden', node.pos)
}
if (to_sym.is_number() && from_sym.name == 'JS.Number')
@ -2417,7 +2423,8 @@ pub fn (mut c Checker) cast_expr(mut node ast.CastExpr) ast.Type {
node.expr_type = c.promote_num(node.expr_type, xx)
from_type = node.expr_type
}
if !c.table.sumtype_has_variant(to_type, from_type, false) && !to_type.has_flag(.optional) {
if !c.table.sumtype_has_variant(to_type, from_type, false) && !to_type.has_flag(.optional)
&& !to_type.has_flag(.result) {
ft := c.table.type_to_str(from_type)
tt := c.table.type_to_str(to_type)
c.error('cannot cast `$ft` to `$tt`', node.pos)
@ -2473,7 +2480,8 @@ pub fn (mut c Checker) cast_expr(mut node ast.CastExpr) ast.Type {
} else if to_type == ast.bool_type && from_type != ast.bool_type && !c.inside_unsafe
&& !c.pref.translated && !c.file.is_translated {
c.error('cannot cast to bool - use e.g. `some_int != 0` instead', node.pos)
} else if from_type == ast.none_type && !to_type.has_flag(.optional) {
} else if from_type == ast.none_type && !to_type.has_flag(.optional)
&& !to_type.has_flag(.result) {
type_name := c.table.type_to_str(to_type)
c.error('cannot cast `none` to `$type_name`', node.pos)
} else if from_sym.kind == .struct_ && !from_type.is_ptr() {
@ -2487,9 +2495,16 @@ pub fn (mut c Checker) cast_expr(mut node ast.CastExpr) ast.Type {
ft := c.table.type_to_str(from_type)
tt := c.table.type_to_str(to_type)
c.error('cannot cast type `$ft` to `$tt`', node.pos)
} else if from_type.has_flag(.optional) || from_type.has_flag(.variadic) {
} else if from_type.has_flag(.optional) || from_type.has_flag(.result)
|| from_type.has_flag(.variadic) {
// variadic case can happen when arrays are converted into variadic
msg := if from_type.has_flag(.optional) { 'an optional' } else { 'a variadic' }
msg := if from_type.has_flag(.optional) {
'an optional'
} else if from_type.has_flag(.result) {
'a result'
} else {
'a variadic'
}
c.error('cannot type cast $msg', node.pos)
} else if !c.inside_unsafe && to_type.is_ptr() && from_type.is_ptr()
&& to_type.deref() != ast.char_type && from_type.deref() != ast.char_type {
@ -2820,7 +2835,7 @@ pub fn (mut c Checker) ident(mut node ast.Ident) ast.Type {
typ = c.expr(obj.expr)
}
}
is_optional := typ.has_flag(.optional)
is_optional := typ.has_flag(.optional) || typ.has_flag(.result)
node.kind = .variable
node.info = ast.IdentVar{
typ: typ
@ -2832,7 +2847,7 @@ pub fn (mut c Checker) ident(mut node ast.Ident) ast.Type {
node.obj = obj
// unwrap optional (`println(x)`)
if is_optional {
return typ.clear_flag(.optional)
return typ.clear_flag(.optional).clear_flag(.result)
}
return typ
}
@ -2873,7 +2888,7 @@ pub fn (mut c Checker) ident(mut node ast.Ident) ast.Type {
if mut obj.expr is ast.CallExpr {
if obj.expr.or_block.kind != .absent {
typ = typ.clear_flag(.optional)
typ = typ.clear_flag(.optional).clear_flag(.result)
}
}
}
@ -3440,13 +3455,13 @@ fn (mut c Checker) check_index(typ_sym &ast.TypeSymbol, index ast.Expr, index_ty
}
}
}
if index_type.has_flag(.optional) {
if index_type.has_flag(.optional) || index_type.has_flag(.result) {
type_str := if typ_sym.kind == .string {
'(type `$typ_sym.name`)'
} else {
'(array type `$typ_sym.name`)'
}
c.error('cannot use optional as index $type_str', pos)
c.error('cannot use optional or result as index $type_str', pos)
}
}
}
@ -3481,6 +3496,8 @@ pub fn (mut c Checker) index_expr(mut node ast.IndexExpr) ast.Type {
}
if typ.has_flag(.optional) {
c.error('type `?$typ_sym.name` is optional, it does not support indexing', node.left.pos())
} else if typ.has_flag(.result) {
c.error('type `!$typ_sym.name` is result, it does not support indexing', node.left.pos())
}
if typ_sym.kind == .string && !typ.is_ptr() && node.is_setter {
c.error('cannot assign to s[i] since V strings are immutable\n' +

2
vlib/v/checker/tests/optional_fn_err.out
View File

@ -103,7 +103,7 @@ vlib/v/checker/tests/optional_fn_err.vv:58:8: error: bar() returns an option, so
| ~~~~~~
59 | _ := [1]int{init: bar(0)}
60 | // index
vlib/v/checker/tests/optional_fn_err.vv:61:13: error: cannot use optional as index (array type `[]int`)
vlib/v/checker/tests/optional_fn_err.vv:61:13: error: cannot use optional or result as index (array type `[]int`)
59 | _ := [1]int{init: bar(0)}
60 | // index
61 | println(arr[bar(0)])