/
fn.v
1257 lines (1230 loc) · 35 KB
/
fn.v
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// Copyright (c) 2019-2024 Alexander Medvednikov. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
module parser
import v.ast
import v.token
import v.util
import os
fn (mut p Parser) call_expr(language ast.Language, mod string) ast.CallExpr {
first_pos := p.tok.pos()
mut name := if language == .js { p.check_js_name() } else { p.check_name() }
mut is_static_type_method := language == .v && name != '' && name[0].is_capital()
&& p.tok.kind == .dot
if is_static_type_method {
p.check(.dot)
name = name + '__static__' + p.check_name()
}
mut fn_name := if language == .c {
'C.${name}'
} else if language == .js {
'JS.${name}'
} else if language == .wasm {
'WASM.${name}'
} else if mod != '' {
'${mod}.${name}'
} else {
name
}
if language != .v {
p.check_for_impure_v(language, first_pos)
}
mut or_kind := ast.OrKind.absent
if fn_name == 'json.decode' {
p.expecting_type = true // Makes name_expr() parse the type `User` in `json.decode(User, txt)`
}
old_expr_mod := p.expr_mod
defer {
p.expr_mod = old_expr_mod
}
p.expr_mod = ''
mut concrete_types := []ast.Type{}
mut concrete_list_pos := p.tok.pos()
if p.tok.kind in [.lt, .lsbr] {
// `foo<int>(10)`
p.expr_mod = ''
concrete_types = p.parse_concrete_types()
concrete_list_pos = concrete_list_pos.extend(p.prev_tok.pos())
}
p.check(.lpar)
args := p.call_args()
if p.tok.kind != .rpar {
params := p.table.fns[fn_name] or { unsafe { p.table.fns['${p.mod}.${fn_name}'] } }.params
if args.len < params.len && p.prev_tok.kind != .comma {
p.unexpected_with_pos(p.prev_tok.pos(), expecting: '`,`')
} else if args.len > params.len {
ok_arg_pos := (args[params.len - 1] or { args[0] }).pos
pos := token.Pos{
...ok_arg_pos
col: ok_arg_pos.col + ok_arg_pos.len
}
p.unexpected_with_pos(pos.extend(p.tok.pos()), expecting: '`)`')
} else {
p.unexpected_with_pos(p.prev_tok.pos(), expecting: '`)`')
}
}
last_pos := p.tok.pos()
p.next()
mut pos := first_pos.extend(last_pos)
mut or_stmts := []ast.Stmt{} // TODO: remove unnecessary allocations by just using .absent
mut or_pos := p.tok.pos()
if p.tok.kind == .key_orelse {
// `foo() or {}``
or_kind = .block
or_stmts, or_pos = p.or_block(.with_err_var)
}
if p.tok.kind in [.question, .not] {
is_not := p.tok.kind == .not
// `foo()?`
p.next()
if p.inside_defer {
p.error_with_pos('error propagation not allowed inside `defer` blocks', p.prev_tok.pos())
}
or_kind = if is_not { .propagate_result } else { .propagate_option }
}
if fn_name in p.imported_symbols {
fn_name = p.imported_symbols[fn_name]
p.register_used_import_for_symbol_name(fn_name)
}
comments := p.eat_comments(same_line: true)
pos.update_last_line(p.prev_tok.line_nr)
return ast.CallExpr{
name: fn_name
name_pos: first_pos
args: args
mod: p.mod
pos: pos
language: language
concrete_types: concrete_types
concrete_list_pos: concrete_list_pos
raw_concrete_types: concrete_types
or_block: ast.OrExpr{
stmts: or_stmts
kind: or_kind
pos: or_pos
}
scope: p.scope
comments: comments
}
}
fn (mut p Parser) call_args() []ast.CallArg {
prev_inside_call_args := true
p.inside_call_args = true
defer {
p.inside_call_args = prev_inside_call_args
}
mut args := []ast.CallArg{}
for p.tok.kind != .rpar && p.tok.kind != .comma {
if p.tok.kind == .eof {
return args
}
is_shared := p.tok.kind == .key_shared
is_atomic := p.tok.kind == .key_atomic
is_mut := p.tok.kind == .key_mut || is_shared || is_atomic
if is_mut {
p.next()
}
mut comments := p.eat_comments()
arg_start_pos := p.tok.pos()
mut array_decompose := false
if p.tok.kind == .ellipsis {
p.next()
array_decompose = true
}
mut expr := ast.empty_expr
if p.tok.kind == .name && p.peek_tok.kind == .colon {
// `foo(key:val, key2:val2)`
expr = p.struct_init('void_type', .short_syntax, false)
} else {
expr = p.expr(0)
}
if array_decompose {
expr = ast.ArrayDecompose{
expr: expr
pos: p.tok.pos()
}
}
if mut expr is ast.StructInit {
expr.pre_comments << comments
comments = []ast.Comment{}
}
pos := arg_start_pos.extend(p.prev_tok.pos())
comments << p.eat_comments()
args << ast.CallArg{
is_mut: is_mut
share: ast.sharetype_from_flags(is_shared, is_atomic)
expr: expr
comments: comments
pos: pos
}
if p.tok.kind == .comma {
p.next()
}
}
return args
}
struct ReceiverParsingInfo {
mut:
name string
pos token.Pos
typ ast.Type
type_pos token.Pos
is_mut bool
language ast.Language
}
fn (mut p Parser) fn_decl() ast.FnDecl {
p.top_level_statement_start()
start_pos := p.tok.pos()
mut is_manualfree := p.is_manualfree
mut is_deprecated := false
mut is_direct_arr := false
mut is_keep_alive := false
mut is_exported := false
mut is_unsafe := false
mut is_trusted := false
mut is_noreturn := false
mut is_ctor_new := false
mut is_c2v_variadic := false
mut is_markused := false
mut comments := []ast.Comment{}
for fna in p.attrs {
match fna.name {
'noreturn' {
is_noreturn = true
}
'manualfree' {
is_manualfree = true
}
'deprecated' {
is_deprecated = true
}
'direct_array_access' {
is_direct_arr = true
}
'keep_args_alive' {
is_keep_alive = true
}
'export' {
is_exported = true
}
'wasm_export' {
is_exported = true
}
'unsafe' {
is_unsafe = true
}
'trusted' {
is_trusted = true
}
'c2v_variadic' {
is_c2v_variadic = true
}
'use_new' {
is_ctor_new = true
}
'markused' {
is_markused = true
}
'windows_stdcall' {
p.note_with_pos('the tag [windows_stdcall] has been deprecated, it will be an error after 2022-06-01, use `[callconv: stdcall]` instead',
p.tok.pos())
}
'_fastcall' {
p.note_with_pos('the tag [_fastcall] has been deprecated, it will be an error after 2022-06-01, use `[callconv: fastcall]` instead',
p.tok.pos())
}
'callconv' {
if !fna.has_arg {
p.error_with_pos('callconv attribute is present but its value is missing',
p.prev_tok.pos())
}
if fna.arg !in ['stdcall', 'fastcall', 'cdecl'] {
p.error_with_pos('unsupported calling convention, supported are stdcall, fastcall and cdecl',
p.prev_tok.pos())
}
}
else {}
}
}
conditional_ctdefine_idx := p.attrs.find_comptime_define() or { -1 }
is_pub := p.tok.kind == .key_pub
if is_pub {
p.next()
}
p.check(.key_fn)
comments << p.eat_comments()
p.open_scope()
defer {
p.close_scope()
}
language_tok_pos := p.tok.pos()
mut language := p.parse_language()
p.fn_language = language
if language != .v {
for fna in p.attrs {
if fna.name == 'export' {
p.error_with_pos('interop function cannot be exported', fna.pos)
break
}
}
}
if is_keep_alive && language != .c {
p.error_with_pos('attribute [keep_args_alive] is only supported for C functions',
language_tok_pos)
}
if language != .v {
p.check_for_impure_v(language, language_tok_pos)
if language == .c {
is_unsafe = !is_trusted
}
}
// Receiver?
mut rec := ReceiverParsingInfo{
typ: ast.void_type
language: language
}
mut is_method := false
mut is_static_type_method := false
mut params := []ast.Param{}
if p.tok.kind == .lpar {
is_method = true
p.fn_receiver(mut params, mut rec) or { return ast.FnDecl{
scope: unsafe { nil }
} }
// rec.language was initialized with language variable.
// So language is changed only if rec.language has been changed.
language = rec.language
p.fn_language = language
}
mut name := ''
mut type_sym := p.table.sym(rec.typ)
mut name_pos := p.tok.pos()
if p.tok.kind == .name {
mut check_name := ''
// TODO: high order fn
is_static_type_method = p.tok.lit.len > 0 && p.tok.lit[0].is_capital()
&& p.peek_tok.kind == .dot && language == .v // `fn Foo.bar() {}`
if is_static_type_method {
type_name := p.tok.lit // "Foo"
rec.typ = p.parse_type()
p.check(.dot)
check_name = p.check_name()
name = type_name + '__static__' + check_name // "foo__bar"
name_pos = name_pos.extend(p.prev_tok.pos())
} else {
check_name = if language == .js { p.check_js_name() } else { p.check_name() }
name = check_name
}
if language == .v && !p.pref.translated && !p.is_translated
&& util.contains_capital(check_name) && !p.builtin_mod {
p.error_with_pos('function names cannot contain uppercase letters, use snake_case instead',
name_pos)
return ast.FnDecl{
scope: unsafe { nil }
}
}
if is_method {
mut is_duplicate := type_sym.has_method(name)
// make sure this is a normal method and not an interface method
if type_sym.kind == .interface_ && is_duplicate {
if mut type_sym.info is ast.Interface {
// if the method is in info then its an interface method
is_duplicate = !type_sym.info.has_method(name)
}
}
if is_duplicate {
p.error_with_pos('duplicate method `${name}`', name_pos)
return ast.FnDecl{
scope: unsafe { nil }
}
}
}
if !p.pref.is_fmt {
if name in p.imported_symbols {
p.error_with_pos('cannot redefine imported function `${name}`', name_pos)
return ast.FnDecl{
scope: unsafe { nil }
}
}
}
} else if p.tok.kind in [.plus, .minus, .mul, .div, .mod, .lt, .eq] && p.peek_tok.kind == .lpar {
name = p.tok.kind.str() // op_to_fn_name()
if rec.typ == ast.void_type {
p.error_with_pos('cannot use operator overloading with normal functions',
p.tok.pos())
}
p.next()
} else if p.tok.kind in [.ne, .gt, .ge, .le] && p.peek_tok.kind == .lpar {
p.error_with_pos('cannot overload `!=`, `>`, `<=` and `>=` as they are auto generated from `==` and`<`',
p.tok.pos())
} else if p.tok.kind in [.plus_assign, .minus_assign, .div_assign, .mult_assign, .mod_assign] {
extracted_op := match p.tok.kind {
.plus_assign { '+' }
.minus_assign { '-' }
.div_assign { '/' }
.mod_assign { '%' }
.mult_assign { '*' }
else { 'unknown op' }
}
if type_sym.has_method(extracted_op) {
p.error('cannot overload `${p.tok.kind}`, operator is implicitly overloaded because the `${extracted_op}` operator is overloaded')
}
p.error('cannot overload `${p.tok.kind}`, overload `${extracted_op}` and `${p.tok.kind}` will be automatically generated')
} else {
p.error_with_pos('expecting method name', p.tok.pos())
return ast.FnDecl{
scope: unsafe { nil }
}
}
// [T]
_, mut generic_names := p.parse_generic_types()
// generic names can be infer with receiver's generic names
if is_method && rec.typ.has_flag(.generic) {
sym := p.table.sym(rec.typ)
if sym.info is ast.Struct {
decl_generic_names := p.types_to_names(sym.info.generic_types, p.tok.pos(),
'sym.info.generic_types') or { return ast.FnDecl{
scope: unsafe { nil }
} }
fn_generic_names := generic_names.clone()
generic_names = p.table.generic_type_names(rec.typ)
if decl_generic_names.len != generic_names.len {
plural := if decl_generic_names.len == 1 { '' } else { 's' }
p.error_with_pos('expected ${decl_generic_names.len} generic parameter${plural}, got ${generic_names.len}',
rec.type_pos)
}
for gname in fn_generic_names {
if gname !in generic_names {
generic_names << gname
}
}
}
}
// Params
params_t, are_params_type_only, mut is_variadic := p.fn_params()
if is_c2v_variadic {
is_variadic = true
}
params << params_t
if !are_params_type_only {
for k, param in params {
if p.scope.known_var(param.name) {
p.error_with_pos('redefinition of parameter `${param.name}`', param.pos)
return ast.FnDecl{
scope: unsafe { nil }
}
}
is_stack_obj := !param.typ.has_flag(.shared_f) && (param.is_mut || param.typ.is_ptr())
p.scope.register(ast.Var{
name: param.name
typ: param.typ
is_mut: param.is_mut
is_auto_deref: param.is_mut || param.is_auto_rec
is_stack_obj: is_stack_obj
pos: param.pos
is_used: true
is_arg: true
ct_type_var: if (!is_method || k > 0) && param.typ.has_flag(.generic)
&& !param.typ.has_flag(.variadic) {
.generic_param
} else {
.no_comptime
}
})
}
}
// Return type
mut return_type_pos := p.tok.pos()
mut return_type := ast.void_type
// don't confuse token on the next line: fn decl, [attribute]
same_line := p.tok.line_nr == p.prev_tok.line_nr
if (p.tok.kind.is_start_of_type() && (same_line || p.tok.kind != .lsbr))
|| (same_line && p.tok.kind == .key_fn) {
p.inside_fn_return = true
return_type = p.parse_type()
p.inside_fn_return = false
return_type_pos = return_type_pos.extend(p.prev_tok.pos())
if p.tok.kind in [.question, .not] {
ret_type_sym := p.table.sym(return_type)
p.error_with_pos('wrong syntax, it must be ${p.tok.kind}${ret_type_sym.name}, not ${ret_type_sym.name}${p.tok.kind}',
return_type_pos)
}
}
if p.tok.kind == .comma {
mr_pos := return_type_pos.extend(p.peek_tok.pos())
p.error_with_pos('multiple return types in function declaration must use parentheses, e.g. (int, string)',
mr_pos)
}
mut type_sym_method_idx := 0
no_body := p.tok.kind != .lcbr
end_pos := p.prev_tok.pos()
short_fn_name := name
is_main := short_fn_name == 'main' && p.mod == 'main'
is_test := (!is_method && params.len == 0) && p.inside_test_file
&& (short_fn_name.starts_with('test_') || short_fn_name.starts_with('testsuite_'))
file_mode := p.file_backend_mode
if is_main {
if _ := p.table.find_fn('main.main') {
if '.' in os.args {
p.error_with_pos('multiple `main` functions detected, and you ran `v .`
perhaps there are multiple V programs in this directory, and you need to
run them via `v file.v` instead',
name_pos)
}
}
}
if is_method && is_static_type_method {
p.error_with_pos('cannot declare a static function as a receiver method', name_pos)
}
// Register
if is_method {
// 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 && !(p.builtin_mod && p.pref.is_fmt) && type_sym.kind in [.array, .map] {
elem_type_sym := p.table.sym(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 ${type_sym.name}',
rec.type_pos)
return ast.FnDecl{
scope: unsafe { nil }
}
}
type_sym_method_idx = type_sym.register_method(ast.Fn{
name: name
file_mode: file_mode
params: params
return_type: return_type
is_variadic: is_variadic
generic_names: generic_names
is_pub: is_pub
is_deprecated: is_deprecated
is_noreturn: is_noreturn
is_unsafe: is_unsafe
is_main: is_main
is_test: is_test
is_keep_alive: is_keep_alive
is_method: true
receiver_type: rec.typ
//
attrs: p.attrs
is_conditional: conditional_ctdefine_idx != ast.invalid_type_idx
ctdefine_idx: conditional_ctdefine_idx
//
no_body: no_body
mod: p.mod
file: p.file_path
pos: start_pos
language: language
})
} else {
name = match language {
.c { 'C.${name}' }
.js { 'JS.${name}' }
.wasm { 'WASM.${name}' }
else { p.prepend_mod(name) }
}
if !p.pref.translated && language == .v {
if existing := p.table.fns[name] {
if existing.name != '' {
if file_mode == .v && existing.file_mode != .v {
// a definition made in a .c.v file, should have a priority over a .v file definition of the same function
if !p.pref.is_fmt {
name = p.prepend_mod('pure_v_but_overridden_by_${existing.file_mode}_${short_fn_name}')
}
} else {
p.table.redefined_fns << name
}
}
}
}
p.table.register_fn(ast.Fn{
name: name
file_mode: file_mode
params: params
return_type: return_type
is_variadic: is_variadic
generic_names: generic_names
is_pub: is_pub
is_deprecated: is_deprecated
is_noreturn: is_noreturn
is_ctor_new: is_ctor_new
is_unsafe: is_unsafe
is_main: is_main
is_test: is_test
is_keep_alive: is_keep_alive
is_method: false
is_static_type_method: is_static_type_method
receiver_type: if is_static_type_method { rec.typ } else { 0 } // used only if is static type method
is_file_translated: p.is_translated
//
attrs: p.attrs
is_conditional: conditional_ctdefine_idx != ast.invalid_type_idx
ctdefine_idx: conditional_ctdefine_idx
//
no_body: no_body
mod: p.mod
file: p.file_path
pos: start_pos
language: language
})
}
// Body
p.cur_fn_name = name
mut stmts := []ast.Stmt{}
body_start_pos := p.tok.pos()
if p.tok.kind == .lcbr {
if language != .v && !(language == .js && type_sym.info is ast.Interface) {
p.error_with_pos('interop functions cannot have a body', body_start_pos)
}
p.inside_fn = true
p.inside_unsafe_fn = is_unsafe
stmts = p.parse_block_no_scope(true)
p.inside_unsafe_fn = false
p.inside_fn = false
}
if !no_body && are_params_type_only {
p.error_with_pos('functions with type only params can not have bodies', body_start_pos)
return ast.FnDecl{
scope: unsafe { nil }
}
}
// if no_body && !name.starts_with('C.') {
// p.error_with_pos('did you mean C.$name instead of $name', start_pos)
// }
fn_decl := ast.FnDecl{
name: name
short_name: short_fn_name
mod: p.mod
stmts: stmts
return_type: return_type
return_type_pos: return_type_pos
params: params
is_noreturn: is_noreturn
is_manualfree: is_manualfree
is_deprecated: is_deprecated
is_exported: is_exported
is_direct_arr: is_direct_arr
is_pub: is_pub
is_variadic: is_variadic
is_main: is_main
is_test: is_test
is_keep_alive: is_keep_alive
is_unsafe: is_unsafe
is_markused: is_markused
is_file_translated: p.is_translated
//
attrs: p.attrs
is_conditional: conditional_ctdefine_idx != ast.invalid_type_idx
ctdefine_idx: conditional_ctdefine_idx
//
receiver: ast.StructField{
name: rec.name
typ: rec.typ
}
generic_names: generic_names
receiver_pos: rec.pos
is_method: is_method
is_static_type_method: is_static_type_method
method_type_pos: rec.type_pos
method_idx: type_sym_method_idx
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)
name_pos: name_pos
body_pos: body_start_pos
file: p.file_path
is_builtin: p.builtin_mod || p.mod in util.builtin_module_parts
scope: p.scope
label_names: p.label_names
end_comments: p.eat_comments(same_line: true)
comments: comments
}
if generic_names.len > 0 {
p.table.register_fn_generic_types(fn_decl.fkey())
}
p.label_names = []
return fn_decl
}
fn (mut p Parser) fn_receiver(mut params []ast.Param, mut rec ReceiverParsingInfo) ! {
p.inside_receiver_param = true
defer {
p.inside_receiver_param = false
}
lpar_pos := p.tok.pos()
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`
}
if is_shared {
p.register_auto_import('sync')
}
rec_start_pos := p.tok.pos()
rec.name = p.check_name()
if !rec.is_mut {
rec.is_mut = p.tok.kind == .key_mut
if rec.is_mut {
ptoken2 := p.peek_token(2) // needed to prevent codegen bug, where .pos() expects &Token
p.warn_with_pos('use `(mut f Foo)` instead of `(f mut Foo)`', lpar_pos.extend(ptoken2.pos()))
}
}
if p.tok.kind == .key_shared {
ptoken2 := p.peek_token(2) // needed to prevent codegen bug, where .pos() expects &Token
p.error_with_pos('use `(shared f Foo)` instead of `(f shared Foo)`', lpar_pos.extend(ptoken2.pos()))
}
rec.pos = rec_start_pos.extend(p.tok.pos())
is_amp := p.tok.kind == .amp
if p.tok.kind == .name && p.tok.lit == 'JS' {
rec.language = ast.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.pos()
rec.typ = p.parse_type_with_mut(rec.is_mut)
if rec.typ.idx() == 0 {
// error is set in parse_type
return error('void receiver type')
}
rec.type_pos = rec.type_pos.extend(p.prev_tok.pos())
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.pos()))
return error('invalid `mut f &Foo`')
}
if is_shared {
rec.typ = rec.typ.set_flag(.shared_f)
}
if is_atomic {
rec.typ = rec.typ.set_flag(.atomic_f)
}
// optimize method `automatic use fn (a &big_foo) instead of fn (a big_foo)`
type_sym := p.table.sym(rec.typ)
mut is_auto_rec := false
if type_sym.kind == .struct_ {
info := type_sym.info as ast.Struct
if !rec.is_mut && !rec.typ.is_ptr() && info.fields.len > 8 {
rec.typ = rec.typ.ref()
is_auto_rec = true
}
}
if rec.language != .v {
p.check_for_impure_v(rec.language, rec.type_pos)
}
p.check(.rpar)
if is_auto_rec && p.tok.kind != .name {
// Disable the auto-reference conversion for methodlike operators like ==, <=, > etc,
// since their parameters and receivers, *must* always be of the same type.
is_auto_rec = false
rec.typ = rec.typ.deref()
}
params << ast.Param{
pos: rec_start_pos
name: rec.name
is_mut: rec.is_mut
is_atomic: is_atomic
is_shared: is_shared
is_auto_rec: is_auto_rec
typ: rec.typ
type_pos: rec.type_pos
}
}
fn (mut p Parser) anon_fn() ast.AnonFn {
pos := p.tok.pos()
p.check(.key_fn)
if p.tok.kind == .name {
if p.disallow_declarations_in_script_mode() {
return ast.AnonFn{}
}
}
old_inside_defer := p.inside_defer
p.inside_defer = false
p.open_scope()
defer {
p.close_scope()
}
p.scope.detached_from_parent = true
inherited_vars := if p.tok.kind == .lsbr && !(p.peek_tok.kind == .name
&& p.peek_tok.lit.len == 1 && p.peek_tok.lit[0].is_capital()) {
p.closure_vars()
} else {
[]ast.Param{}
}
inherited_vars_name := inherited_vars.map(it.name)
_, generic_names := p.parse_generic_types()
params, _, is_variadic := p.fn_params()
for param in params {
if param.name == '' && p.table.sym(param.typ).kind != .placeholder {
p.error_with_pos('use `_` to name an unused parameter', param.pos)
}
if param.name in inherited_vars_name {
p.error_with_pos('the parameter name `${param.name}` conflicts with the captured value name',
param.pos)
} else if p.scope.known_var(param.name) {
p.error_with_pos('redefinition of parameter `${param.name}`', param.pos)
}
is_stack_obj := !param.typ.has_flag(.shared_f) && (param.is_mut || param.typ.is_ptr())
p.scope.register(ast.Var{
name: param.name
typ: param.typ
is_mut: param.is_mut
is_auto_deref: param.is_mut || param.is_auto_rec
pos: param.pos
is_used: true
is_arg: true
is_stack_obj: is_stack_obj
})
}
mut same_line := p.tok.line_nr == p.prev_tok.line_nr
mut return_type := ast.void_type
mut return_type_pos := p.tok.pos()
// lpar: multiple return types
if same_line {
if (p.tok.kind.is_start_of_type() && (same_line || p.tok.kind != .lsbr))
|| (same_line && p.tok.kind == .key_fn) {
p.inside_fn_return = true
return_type = p.parse_type()
p.inside_fn_return = false
return_type_pos = return_type_pos.extend(p.tok.pos())
} else if p.tok.kind != .lcbr {
p.error_with_pos('expected return type, not ${p.tok} for anonymous function',
p.tok.pos())
}
}
mut stmts := []ast.Stmt{}
no_body := p.tok.kind != .lcbr
same_line = p.tok.line_nr == p.prev_tok.line_nr
if no_body && same_line {
p.unexpected(got: '${p.tok} after anonymous function signature', expecting: '`{`')
}
mut label_names := []string{}
mut func := ast.Fn{
params: params
is_variadic: is_variadic
return_type: return_type
is_method: false
}
name := p.table.get_anon_fn_name(p.unique_prefix, func, p.tok.pos)
keep_fn_name := p.cur_fn_name
p.cur_fn_name = name
if p.tok.kind == .lcbr {
tmp := p.label_names
p.label_names = []
stmts = p.parse_block_no_scope(false)
label_names = p.label_names.clone()
p.label_names = tmp
}
p.cur_fn_name = keep_fn_name
func.name = name
idx := p.table.find_or_register_fn_type(func, true, false)
typ := ast.new_type(idx)
p.inside_defer = old_inside_defer
// name := p.table.get_type_name(typ)
return ast.AnonFn{
decl: ast.FnDecl{
name: name
short_name: ''
mod: p.mod
stmts: stmts
return_type: return_type
return_type_pos: return_type_pos
params: params
is_variadic: is_variadic
is_method: false
generic_names: generic_names
is_anon: true
no_body: no_body
pos: pos.extend(p.prev_tok.pos())
file: p.file_path
scope: p.scope
label_names: label_names
}
inherited_vars: inherited_vars
typ: typ
}
}
// part of fn declaration
fn (mut p Parser) fn_params() ([]ast.Param, bool, bool) {
p.check(.lpar)
mut params := []ast.Param{}
mut is_variadic := false
// `int, int, string` (no names, just types)
param_name := if p.tok.kind == .name && p.tok.lit.len > 0 && p.tok.lit[0].is_capital() {
p.prepend_mod(p.tok.lit)
} else {
p.tok.lit
}
is_generic_type := p.tok.kind == .name && p.tok.lit.len == 1 && p.tok.lit[0].is_capital()
types_only := p.tok.kind in [.amp, .ellipsis, .key_fn, .lsbr]
|| (p.peek_tok.kind == .comma && (p.table.known_type(param_name) || is_generic_type))
|| p.peek_tok.kind == .dot || p.peek_tok.kind == .rpar || p.fn_language == .c
|| (p.tok.kind == .key_mut && (p.peek_tok.kind in [.amp, .ellipsis, .key_fn, .lsbr]
|| p.peek_token(2).kind == .comma || p.peek_token(2).kind == .rpar
|| (p.peek_tok.kind == .name && p.peek_token(2).kind == .dot)))
// TODO: copy paste, merge 2 branches
if types_only {
mut param_no := 1
for p.tok.kind != .rpar {
mut comments := p.eat_comments()
if p.tok.kind == .eof {
p.error_with_pos('expecting `)`', p.tok.pos())
return []ast.Param{}, false, false
}
is_shared := p.tok.kind == .key_shared
is_atomic := p.tok.kind == .key_atomic
is_mut := p.tok.kind == .key_mut || is_shared || is_atomic
mut name := ''
if is_mut {
p.next()
}
if p.fn_language == .c && p.tok.kind == .name
&& p.peek_tok.kind !in [.comma, .rpar, .dot] {
name = p.tok.lit
p.next()
}
if p.tok.kind == .ellipsis {
p.next()
is_variadic = true
}
pos := p.tok.pos()
mut param_type := p.parse_type()
type_pos := pos.extend(p.prev_tok.pos())
if param_type == 0 {
// error is added in parse_type
return []ast.Param{}, false, false
}
if is_mut {
if !param_type.has_flag(.generic) {
if is_variadic {
p.error_with_pos('variadic arguments cannot be `mut`, `shared` or `atomic`',
pos)
}
if is_shared {
p.check_fn_shared_arguments(param_type, pos)
} else if is_atomic {
p.check_fn_atomic_arguments(param_type, pos)
} else {
p.check_fn_mutable_arguments(param_type, pos)
}
} else if is_shared || is_atomic {
p.error_with_pos('generic object cannot be `atomic`or `shared`', pos)
return []ast.Param{}, false, false
}
// if arg_type.is_ptr() {
// p.error('cannot mut')
// }
// arg_type = arg_type.ref()
param_type = param_type.set_nr_muls(1)
if is_shared {
param_type = param_type.set_flag(.shared_f)
}
if is_atomic {
param_type = param_type.set_flag(.atomic_f)
}
}
if is_variadic {
param_type = ast.new_type(p.table.find_or_register_array(param_type)).set_flag(.variadic)
}
if p.tok.kind == .eof {
p.error_with_pos('expecting `)`', p.prev_tok.pos())
return []ast.Param{}, false, false
}
comments << p.eat_comments()
if p.tok.kind == .comma {
if is_variadic {
p.error_with_pos('cannot use ...(variadic) with non-final parameter no ${param_no}',
pos)
return []ast.Param{}, false, false
}
p.next()
}
alanguage := p.table.sym(param_type).language
if alanguage != .v {
p.check_for_impure_v(alanguage, pos)
}
params << ast.Param{
pos: pos
name: name
is_mut: is_mut
typ: param_type
type_pos: type_pos
comments: comments
}
param_no++
if param_no > 1024 {
p.error_with_pos('too many parameters', pos)
return []ast.Param{}, false, false
}
}
} else {
for p.tok.kind != .rpar {
mut comments := p.eat_comments()
if p.tok.kind == .eof {
p.error_with_pos('expecting `)`', p.tok.pos())
return []ast.Param{}, false, false
}
is_shared := p.tok.kind == .key_shared
is_atomic := p.tok.kind == .key_atomic
mut is_mut := p.tok.kind == .key_mut || is_shared || is_atomic
if is_mut {