404 lines
10 KiB
V
404 lines
10 KiB
V
// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
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// Use of this source code is governed by an MIT license
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// that can be found in the LICENSE file.
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module compiler
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// also unions and interfaces
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fn (p mut Parser) struct_decl() {
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is_pub := p.tok == .key_pub
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if is_pub {
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p.next()
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p.fspace()
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}
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// V can generate Objective C for integration with Cocoa
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// `[objc_interface:ParentInterface]`
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is_objc := p.attr.starts_with('objc_interface')
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objc_parent := if is_objc { p.attr[15..] } else { '' }
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// interface, union, struct
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is_interface := p.tok == .key_interface
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is_union := p.tok == .key_union
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is_struct := p.tok == .key_struct
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mut cat := key_to_type_cat(p.tok)
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if is_objc {
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cat = .objc_interface
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}
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p.next()
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p.fspace()
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// Get type name
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mut name := p.check_name()
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if name.contains('_') && !p.pref.translated {
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p.error('type names cannot contain `_`')
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}
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if !p.builtin_mod && !name[0].is_capital() {
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p.error('mod=$p.mod struct names must be capitalized: use `struct ${name.capitalize()}`')
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}
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if is_interface && !name.ends_with('er') {
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p.error('interface names temporarily have to end with `er` (e.g. `Speaker`, `Reader`)')
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}
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is_c := name == 'C' && p.tok == .dot
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if is_c {
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/*
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if !p.pref.building_v && !p.fileis('vlib') {
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p.warn('Virtual C structs will soon be removed from the language' +
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'\ndefine the C structs and functions in V')
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}
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*/
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p.check(.dot)
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name = p.check_name()
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cat = .c_struct
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if p.attr == 'typedef' {
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cat = .c_typedef
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}
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}
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if name.len == 1 && !p.pref.building_v && !p.pref.is_repl {
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p.warn('struct names must have more than one character')
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}
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if !is_c && !good_type_name(name) {
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p.error('bad struct name, e.g. use `HttpRequest` instead of `HTTPRequest`')
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}
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// Specify full type name
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if !is_c && !p.builtin_mod && p.mod != 'main' {
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name = p.prepend_mod(name)
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}
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mut typ := p.table.find_type(name)
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if p.pass == .decl && p.table.known_type_fast(typ) {
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//if name in reserved_type_param_names {
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//p.error('name `$name` is reserved for type parameters')
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//} else {
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p.error('type `$name` redeclared')
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//}
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}
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if is_objc {
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// Forward declaration of an Objective-C interface with `@class` :)
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p.gen_typedef('@class $name;')
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}
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else if !is_c {
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kind := if is_union {'union'} else {'struct'}
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p.gen_typedef('typedef $kind $name $name;')
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}
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// Register the type
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mut is_ph := false
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if typ.is_placeholder {
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// Update the placeholder
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is_ph = true
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typ.name = name
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typ.mod = p.mod
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typ.is_c = is_c
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typ.is_placeholder = false
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typ.cat = cat
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typ.parent = objc_parent
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typ.is_public = is_pub || p.is_vh
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p.table.rewrite_type(typ)
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}
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else {
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typ = Type {
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name: name
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mod: p.mod
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is_c: is_c
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cat: cat
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parent: objc_parent
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is_public: is_pub || p.is_vh
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}
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}
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// Struct `C.Foo` declaration, no body
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if is_c && is_struct && p.tok != .lcbr {
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p.table.register_type(typ)
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return
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}
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p.fspace()
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p.check(.lcbr)
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// Struct fields
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mut is_pub_field := false
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mut is_mut := false
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mut names := []string// to avoid dup names TODO alloc perf
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mut fmt_max_len := 0
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// TODO why is typ.fields == 0?
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if p.scanner.is_fmt && p.pass == .main {
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for field in typ.fields {
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println(field.name)
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if field.name.len > fmt_max_len {
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fmt_max_len = field.name.len
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}
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}
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}
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//println('fmt max len = $max_len nrfields=$typ.fields.len pass=$p.pass')
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if !is_ph && p.first_pass() {
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p.table.register_type(typ)
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//println('registering 1 nrfields=$typ.fields.len')
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}
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mut did_gen_something := false
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mut i := -1
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for p.tok != .rcbr {
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i++
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if p.tok == .key_pub {
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if is_pub_field {
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p.error('structs can only have one `pub:`, all public fields have to be grouped')
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}
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is_pub_field = true
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p.fmt_dec()
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p.check(.key_pub)
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if p.tok != .key_mut {
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p.check(.colon)
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}
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p.fmt_inc()
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p.fgen_nl()
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}
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if p.tok == .key_mut {
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if is_mut {
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p.error('structs can only have one `mut:`, all private mutable fields have to be grouped')
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}
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is_mut = true
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p.fmt_dec()
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p.check(.key_mut)
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if p.tok != .key_mut {
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p.check(.colon)
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}
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p.fmt_inc()
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p.fgen_nl()
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}
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// if is_pub {
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// }
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// (mut) user *User
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// if p.tok == .plus {
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// p.next()
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// }
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// Check if reserved name
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field_name_token_idx := p.cur_tok_index()
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field_name := if name != 'Option' && !is_interface { p.table.var_cgen_name(p.check_name()) } else { p.check_name() }
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/*
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if !p.first_pass() {
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p.fgen(strings.repeat(` `, fmt_max_len - field_name.len))
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}
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*/
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// Check dups
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if field_name in names {
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p.error('duplicate field `$field_name`')
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}
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if !is_c && p.mod != 'os' && contains_capital(field_name) {
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p.error('struct fields cannot contain uppercase letters, use snake_case instead')
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}
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names << field_name
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// We are in an interface?
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// `run() string` => run is a method, not a struct field
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if is_interface {
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f := p.interface_method(field_name, name)
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if p.first_pass() {
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p.add_method(typ.name, f)
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}
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continue
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}
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// `pub` access mod
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access_mod := if is_pub_field { AccessMod.public } else { AccessMod.private}
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p.fspace()
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tt := p.get_type2()
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field_type := tt.name
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if field_type == name {
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p.error_with_token_index('cannot embed struct `$name` in itself (field `$field_name`)', field_name_token_idx)
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}
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// Register ?option type
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if field_type.starts_with('Option_') {
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p.gen_typedef('typedef Option $field_type;')
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}
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p.check_and_register_used_imported_type(field_type)
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is_atomic := p.tok == .key_atomic
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if is_atomic {
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p.next()
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}
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// `a int = 4`
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if p.tok == .assign {
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p.next()
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def_val_type, expr := p.tmp_expr()
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if def_val_type != field_type {
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p.error('expected `$field_type` but got `$def_val_type`')
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}
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//println('pass=$p.pass $typ.name ADDING field=$field_name "$def_val_type" "$expr"')
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if !p.first_pass() {
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p.table.add_default_val(i, typ.name, expr)
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}
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}
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// [ATTR]
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mut attr := ''
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if p.tok == .lsbr {
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p.fspace()
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p.next()
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attr = p.check_name()
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if p.tok == .colon {
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p.check(.colon)
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mut val := ''
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match p.tok {
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.name { val = p.check_name() }
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.str { val = p.check_string() }
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else {
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p.error('attribute value should be either name or string')
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}
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}
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attr += ':' + val
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}
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p.check(.rsbr)
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}
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if attr == 'raw' && field_type != 'string' {
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p.error('struct field with attribute "raw" should be of type "string" but got "$field_type"')
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}
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did_gen_something = true
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if p.first_pass() {
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p.table.add_field(typ.name, field_name, field_type, is_mut, attr, access_mod)
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}
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p.fgen_nl() // newline between struct fields
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}
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p.check(.rcbr)
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if !is_c && !did_gen_something && p.first_pass() {
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p.table.add_field(typ.name, '', 'EMPTY_STRUCT_DECLARATION', false, '', .private)
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}
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p.fgenln('\n')
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}
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// `User{ foo: bar }`
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fn (p mut Parser) struct_init(typ string) string {
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p.is_struct_init = true
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t := p.table.find_type(typ)
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if !t.is_public && t.mod != p.mod {
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p.warn('type `$t.name` is private')
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}
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if p.gen_struct_init(typ, t) { return typ }
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ptr := typ.contains('*')
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mut did_gen_something := false
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// Loop thru all struct init keys and assign values
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// u := User{age:20, name:'bob'}
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// Remember which fields were set, so that we dont have to zero them later
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mut inited_fields := []string
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peek := p.peek()
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if peek == .colon || p.tok == .rcbr {
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for p.tok != .rcbr {
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field := if typ != 'Option' { p.table.var_cgen_name( p.check_name() ) } else { p.check_name() }
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if !p.first_pass() && !t.has_field(field) {
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p.error('`$t.name` has no field `$field`')
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}
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if field in inited_fields {
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p.error('already initialized field `$field` in `$t.name`')
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}
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f := t.find_field(field) or {
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p.error('no such field: "$field" in type $typ')
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break
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}
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tt := p.table.find_type(f.typ)
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if tt.is_flag {
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p.error(err_modify_bitfield)
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}
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inited_fields << field
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p.gen_struct_field_init(field)
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p.check(.colon)
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p.fspace()
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p.expected_type = f.typ
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p.check_types(p.bool_expression(), f.typ)
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if p.tok == .comma {
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p.next()
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}
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if p.tok != .rcbr {
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p.gen(',')
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}
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p.fspace()
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did_gen_something = true
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p.fgen_nl() // newline between struct fields
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}
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// If we already set some fields, need to prepend a comma
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if t.fields.len != inited_fields.len && inited_fields.len > 0 {
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p.gen(',')
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}
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// Zero values: init all fields (ints to 0, strings to '' etc)
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for i, field in t.fields {
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sanitized_name := if typ != 'Option' {
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p.table.var_cgen_name( field.name )
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} else {
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field.name
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}
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// println('### field.name')
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// Skip if this field has already been assigned to
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if sanitized_name in inited_fields {
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continue
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}
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field_typ := field.typ
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if !p.builtin_mod && field_typ.ends_with('*') && p.mod != 'os' { //&&
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p.warn('reference field `${typ}.${field.name}` must be initialized')
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}
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// init map fields
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if field_typ.starts_with('map_') {
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p.gen_struct_field_init(sanitized_name)
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p.gen_empty_map(field_typ[4..])
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inited_fields << sanitized_name
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if i != t.fields.len - 1 {
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p.gen(',')
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}
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did_gen_something = true
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continue
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}
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// Did the user provide a default value for this struct field?
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// Use it. Otherwise zero it.
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def_val := if t.default_vals.len > i && t.default_vals[i] != '' {
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t.default_vals[i]
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} else {
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type_default(field_typ)
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}
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if def_val != '' && def_val != '{0}' {
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p.gen_struct_field_init(sanitized_name)
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p.gen(def_val)
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if i != t.fields.len - 1 {
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p.gen(',')
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}
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did_gen_something = true
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}
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}
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}
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// Point{3,4} syntax
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else {
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mut T := p.table.find_type(typ)
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// Aliases (TODO Hack, implement proper aliases)
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if T.fields.len == 0 && T.parent != '' {
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T = p.table.find_type(T.parent)
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}
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for i, ffield in T.fields {
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expr_typ := p.bool_expression()
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if !p.check_types_no_throw(expr_typ, ffield.typ) {
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p.error('field value #${i+1} `$ffield.name` has type `$ffield.typ`, got `$expr_typ` ')
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}
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tt := p.table.find_type(ffield.typ)
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if tt.is_flag {
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p.error(err_modify_bitfield)
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}
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if i < T.fields.len - 1 {
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if p.tok != .comma {
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p.error('too few values in `$typ` literal (${i+1} instead of $T.fields.len)')
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}
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p.gen(',')
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p.next()
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}
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}
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// Allow `user := User{1,2,3,}`
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// The final comma will be removed by vfmt, since we are not calling `p.fgen()`
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if p.tok == .comma {
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p.next()
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}
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if p.tok != .rcbr {
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p.error('too many fields initialized: `$typ` has $T.fields.len field(s)')
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}
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did_gen_something = true
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}
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if !did_gen_something {
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p.gen('EMPTY_STRUCT_INITIALIZATION')
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}
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p.gen('}')
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if ptr && !p.is_js {
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p.gen(', sizeof($t.name))')
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}
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p.check(.rcbr)
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p.is_struct_init = false
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p.is_c_struct_init = false
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return typ
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}
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