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parser: cleanup fn_decl (#8700)

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zakuro 2021-02-16 00:55:08 +09:00 committed by GitHub
parent 848295cdea
commit 70a30374b9
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1 changed files with 90 additions and 73 deletions
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163
vlib/v/parser/fn.v
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@ -161,6 +161,16 @@ pub fn (mut p Parser) call_args() []ast.CallArg {
return args
}
struct ReceiverParsingInfo {
mut:
name string
pos token.Position
typ table.Type
type_pos token.Position
is_mut bool
language table.Language
}
fn (mut p Parser) fn_decl() ast.FnDecl {
p.top_level_statement_start()
start_pos := p.tok.position()
@ -188,73 +198,21 @@ fn (mut p Parser) fn_decl() ast.FnDecl {
p.check_for_impure_v(language, p.tok.position())
}
// Receiver?
mut rec_name := ''
mut rec := ReceiverParsingInfo{
typ: table.void_type
language: language
}
mut is_method := false
mut receiver_pos := token.Position{}
mut rec_type_pos := token.Position{}
mut rec_type := table.void_type
mut rec_mut := false
mut params := []table.Param{}
if p.tok.kind == .lpar {
lpar_pos := p.tok.position()
p.next() // (
is_method = true
is_shared := p.tok.kind == .key_shared
is_atomic := p.tok.kind == .key_atomic
rec_mut = p.tok.kind == .key_mut || is_shared || is_atomic
if rec_mut {
p.next() // `mut`
}
rec_start_pos := p.tok.position()
rec_name = p.check_name()
if !rec_mut {
rec_mut = p.tok.kind == .key_mut
if rec_mut {
p.warn_with_pos('use `(mut f Foo)` instead of `(f mut Foo)`', lpar_pos.extend(p.peek_tok2.position()))
}
}
if p.tok.kind == .key_shared {
p.error_with_pos('use `(shared f Foo)` instead of `(f shared Foo)`', lpar_pos.extend(p.peek_tok2.position()))
}
receiver_pos = rec_start_pos.extend(p.tok.position())
is_amp := p.tok.kind == .amp
if p.tok.kind == .name && p.tok.lit == 'JS' {
language = table.Language.js
}
// if rec_mut {
// p.check(.key_mut)
// }
// TODO: talk to alex, should mut be parsed with the type like this?
// or should it be a property of the arg, like this ptr/mut becomes indistinguishable
rec_type_pos = p.tok.position()
rec_type = p.parse_type_with_mut(rec_mut)
if rec_type.idx() == 0 {
// error is set in parse_type
return ast.FnDecl{
scope: 0
}
}
rec_type_pos = rec_type_pos.extend(p.prev_tok.position())
if is_amp && rec_mut {
p.error_with_pos('use `(mut f Foo)` or `(f &Foo)` instead of `(mut f &Foo)`',
lpar_pos.extend(p.tok.position()))
return ast.FnDecl{
scope: 0
}
}
if is_shared {
rec_type = rec_type.set_flag(.shared_f)
}
if is_atomic {
rec_type = rec_type.set_flag(.atomic_f)
}
params << table.Param{
pos: rec_start_pos
name: rec_name
is_mut: rec_mut
typ: rec_type
}
p.check(.rpar)
p.fn_receiver(mut params, mut rec) or { return ast.FnDecl{
scope: 0
} }
// rec.language was initialized with language variable.
// So language is changed only if rec.language has been changed.
language = rec.language
}
mut name := ''
if p.tok.kind == .name {
@ -268,7 +226,7 @@ fn (mut p Parser) fn_decl() ast.FnDecl {
scope: 0
}
}
type_sym := p.table.get_type_symbol(rec_type)
type_sym := p.table.get_type_symbol(rec.typ)
// interfaces are handled in the checker, methods can not be defined on them this way
if is_method && (type_sym.has_method(name) && type_sym.kind != .interface_) {
p.error_with_pos('duplicate method `$name`', pos)
@ -285,7 +243,7 @@ fn (mut p Parser) fn_decl() ast.FnDecl {
}
} else if p.tok.kind in [.plus, .minus, .mul, .div, .mod, .lt, .eq] && p.peek_tok.kind == .lpar {
name = p.tok.kind.str() // op_to_fn_name()
if rec_type == table.void_type {
if rec.typ == table.void_type {
p.error_with_pos('cannot use operator overloading with normal functions',
p.tok.position())
}
@ -337,20 +295,20 @@ fn (mut p Parser) fn_decl() ast.FnDecl {
no_body := p.tok.kind != .lcbr
// Register
if is_method {
mut type_sym := p.table.get_type_symbol(rec_type)
mut type_sym := p.table.get_type_symbol(rec.typ)
// Do not allow to modify / add methods to types from other modules
// arrays/maps dont belong to a module only their element types do
// we could also check if kind is .array, .array_fixed, .map instead of mod.len
mut is_non_local := type_sym.mod.len > 0 && type_sym.mod != p.mod && type_sym.language == .v
// check maps & arrays, must be defined in same module as the elem type
if !is_non_local && type_sym.kind in [.array, .map] {
elem_type_sym := p.table.get_type_symbol(p.table.value_type(rec_type))
elem_type_sym := p.table.get_type_symbol(p.table.value_type(rec.typ))
is_non_local = elem_type_sym.mod.len > 0 && elem_type_sym.mod != p.mod
&& elem_type_sym.language == .v
}
if is_non_local {
p.error_with_pos('cannot define new methods on non-local type $type_sym.name',
rec_type_pos)
rec.type_pos)
return ast.FnDecl{
scope: 0
}
@ -427,15 +385,15 @@ fn (mut p Parser) fn_decl() ast.FnDecl {
is_pub: is_pub
is_variadic: is_variadic
receiver: ast.Field{
name: rec_name
typ: rec_type
name: rec.name
typ: rec.typ
}
generic_params: generic_params
receiver_pos: receiver_pos
receiver_pos: rec.pos
is_method: is_method
method_type_pos: rec_type_pos
method_type_pos: rec.type_pos
method_idx: type_sym_method_idx
rec_mut: rec_mut
rec_mut: rec.is_mut
language: language
no_body: no_body
pos: start_pos.extend_with_last_line(end_pos, p.prev_tok.line_nr)
@ -451,6 +409,65 @@ fn (mut p Parser) fn_decl() ast.FnDecl {
return fn_decl
}
fn (mut p Parser) fn_receiver(mut params []table.Param, mut rec ReceiverParsingInfo) ? {
lpar_pos := p.tok.position()
p.next() // (
is_shared := p.tok.kind == .key_shared
is_atomic := p.tok.kind == .key_atomic
rec.is_mut = p.tok.kind == .key_mut || is_shared || is_atomic
if rec.is_mut {
p.next() // `mut`
}
rec_start_pos := p.tok.position()
rec.name = p.check_name()
if !rec.is_mut {
rec.is_mut = p.tok.kind == .key_mut
if rec.is_mut {
p.warn_with_pos('use `(mut f Foo)` instead of `(f mut Foo)`', lpar_pos.extend(p.peek_tok2.position()))
}
}
if p.tok.kind == .key_shared {
p.error_with_pos('use `(shared f Foo)` instead of `(f shared Foo)`', lpar_pos.extend(p.peek_tok2.position()))
}
rec.pos = rec_start_pos.extend(p.tok.position())
is_amp := p.tok.kind == .amp
if p.tok.kind == .name && p.tok.lit == 'JS' {
rec.language = table.Language.js
}
// if rec.is_mut {
// p.check(.key_mut)
// }
// TODO: talk to alex, should mut be parsed with the type like this?
// or should it be a property of the arg, like this ptr/mut becomes indistinguishable
rec.type_pos = p.tok.position()
rec.typ = p.parse_type_with_mut(rec.is_mut)
if rec.typ.idx() == 0 {
// error is set in parse_type
return none
}
rec.type_pos = rec.type_pos.extend(p.prev_tok.position())
if is_amp && rec.is_mut {
p.error_with_pos('use `(mut f Foo)` or `(f &Foo)` instead of `(mut f &Foo)`',
lpar_pos.extend(p.tok.position()))
return none
}
if is_shared {
rec.typ = rec.typ.set_flag(.shared_f)
}
if is_atomic {
rec.typ = rec.typ.set_flag(.atomic_f)
}
params << table.Param{
pos: rec_start_pos
name: rec.name
is_mut: rec.is_mut
typ: rec.typ
}
p.check(.rpar)
return
}
fn (mut p Parser) parse_generic_params() []ast.GenericParam {
mut param_names := []string{}
if p.tok.kind != .lt {