vieter-v
/
v
2
0
Fork 0
Code Issues Pull Requests Releases Activity
v/vlib/compiler/parser.v

2910 lines
73 KiB
V
Raw Blame History

// Copyright (c) 2019 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 compiler
import (
os
strings
compiler.x64
)
struct Parser {
file_path string // "/home/user/hello.v"
file_name string // "hello.v"
file_platform string // ".v", "_windows.v", "_nix.v", "_darwin.v", "_linux.v" ...
// When p.file_pcguard != '', it contains a
// C ifdef guard clause that must be put before
// the #include directives in the parsed .v file
file_pcguard string
v &V
pref &Preferences // Preferences shared from V struct
kek string
mut:
scanner &Scanner
tokens []Token
token_idx int
tok TokenKind
prev_tok TokenKind
prev_tok2 TokenKind // TODO remove these once the tokens are cached
lit string
cgen &CGen
x64 &x64.Gen
table &Table
import_table ImportTable // Holds imports for just the file being parsed
pass Pass
os OS
inside_const bool
expr_var Var
has_immutable_field bool
first_immutable_field Var
assigned_type string // non-empty if we are in an assignment expression
expected_type string
tmp_cnt int
builtin_mod bool
inside_if_expr bool
inside_unwrapping_match_statement bool
inside_return_expr bool
inside_unsafe bool
is_struct_init bool
is_var_decl bool
if_expr_cnt int
for_expr_cnt int // to detect whether `continue` can be used
ptr_cast bool
calling_c bool
cur_fn Fn
local_vars []Var // local function variables
var_idx int
returns bool
vroot string
is_c_struct_init bool
is_empty_c_struct_init bool
is_c_fn_call bool
can_chash bool
attr string
v_script bool // "V bash", import all os functions into global space
var_decl_name string // To allow declaring the variable so that it can be used in the struct initialization
is_alloc bool // Whether current expression resulted in an allocation
is_const_literal bool // `1`, `2.0` etc, so that `u64_var == 0` works
in_dispatch bool // dispatching generic instance?
is_vgen bool
is_sql bool
is_js bool
sql_i int // $1 $2 $3
sql_params []string // ("select * from users where id = $1", ***"100"***)
sql_types []string // int, string and so on; see sql_params
is_vh bool // parsing .vh file (for example `const (a int)` is allowed)
generic_dispatch TypeInst
pub mut:
mod string
}
const (
max_module_depth = 5
reserved_types = {
'i8' : true, 'i16' : true, 'int' : true, 'i64' : true, 'i128' : true,
'byte' : true, 'u16' : true, 'u32' : true, 'u64' : true, 'u128' : true,
'f32' : true, 'f64' : true,
'rune' : true, 'byteptr' : true, 'voidptr' : true
}
)
struct ParserState {
scanner_line_nr int
scanner_text string
scanner_pos int
scanner_line_ends []int
scanner_nlines int
cgen_lines []string
cgen_cur_line string
cgen_tmp_line string
cgen_is_tmp bool
tokens []Token
token_idx int
tok TokenKind
prev_tok TokenKind
prev_tok2 TokenKind
lit string
}
// new parser from string. unique id specified in `id`.
// tip: use a hashing function to auto generate `id` from `text` eg. sha1.hexhash(text)
fn (v mut V) new_parser_from_string(text string) Parser {
mut p := v.new_parser(new_scanner(text))
p.scan_tokens()
return p
}
fn (v mut V) reset_cgen_file_line_parameters(){
v.cgen.line = 0
v.cgen.file = ''
v.cgen.line_directives = v.pref.is_vlines
}
fn (v mut V) new_parser_from_file(path string) Parser {
v.reset_cgen_file_line_parameters()
//println('new_parser("$path")')
mut path_pcguard := ''
mut path_platform := '.v'
for path_ending in ['_lin.v', '_mac.v', '_win.v', '_nix.v', '_linux.v',
'_darwin.v', '_windows.v'] {
if path.ends_with(path_ending) {
if path_ending == '_mac.v' {
p := path_ending.replace('_mac.v', '_darwin.v')
println('warning: use "$p" file name instead of "$path"')
}
if path_ending == '_lin.v' {
p := path_ending.replace('_lin.v', '_linux.v')
println('warning: use "$p" file name instead of "$path"')
}
if path_ending == '_win.v' {
p := path_ending.replace('_win.v', '_windows.v')
println('warning: use "$p" file name instead of "$path"')
}
path_platform = path_ending
path_pcguard = platform_postfix_to_ifdefguard( path_ending )
break
}
}
mut p := v.new_parser(new_scanner_file(path))
p = { p|
file_path: path,
file_name: path.all_after(os.path_separator),
file_platform: path_platform,
file_pcguard: path_pcguard,
is_vh: path.ends_with('.vh'),
v_script: path.ends_with('.vsh')
}
if p.v_script {
println('new_parser: V script')
}
if p.pref.building_v {
p.scanner.should_print_relative_paths_on_error = true
}
//if p.pref.generating_vh {
// Keep newlines
//p.scanner.is_vh = true
//}
p.scan_tokens()
//p.scanner.debug_tokens()
return p
}
// creates a new parser. most likely you will want to use
// `new_parser_file` or `new_parser_string` instead.
fn (v mut V) new_parser(scanner &Scanner) Parser {
v.reset_cgen_file_line_parameters()
mut p := Parser {
scanner: scanner
v: v
table: v.table
cur_fn: EmptyFn
cgen: v.cgen
x64: v.x64
pref: v.pref
os: v.os
vroot: v.vroot
local_vars: [Var{}].repeat(MaxLocalVars)
import_table: new_import_table()
}
$if js {
p.is_js = true
}
if p.pref.is_repl {
p.scanner.should_print_line_on_error = false
p.scanner.should_print_errors_in_color = false
p.scanner.should_print_relative_paths_on_error = true
}
return p
}
fn (p mut Parser) scan_tokens() {
for {
res := p.scanner.scan()
p.tokens << Token{
tok: res.tok
lit: res.lit
line_nr: p.scanner.line_nr
pos: p.scanner.pos
}
if res.tok == .eof {
break
}
}
}
fn (p mut Parser) set_current_fn(f Fn) {
p.cur_fn = f
//p.cur_fn = p.table.fns[f.name]
p.scanner.fn_name = '${f.mod}.${f.name}'
}
fn (p mut Parser) next() {
// Generate a formatted version of this token
// (only when vfmt compile time flag is enabled, otherwise this function
// is not even generated)
p.fnext()
p.prev_tok2 = p.prev_tok
p.prev_tok = p.tok
p.scanner.prev_tok = p.tok
if p.token_idx >= p.tokens.len {
p.tok = .eof
p.lit = ''
return
}
res := p.tokens[p.token_idx]
p.token_idx++
p.tok = res.tok
p.lit = res.lit
p.scanner.line_nr = res.line_nr
p.cgen.line = res.line_nr
}
fn (p &Parser) peek() TokenKind {
if p.token_idx >= p.tokens.len - 2 {
return .eof
}
return p.tokens[p.token_idx].tok
/*
mut i := p.token_idx
for i < p.tokens.len {
tok := p.tokens[i]
if tok.tok != .mline_comment && tok.tok != .line_comment {
return tok.tok
}
i++
}
return .eof
*/
}
// TODO remove dups
[inline] fn (p &Parser) prev_token() Token {
return p.tokens[p.token_idx - 2]
}
[inline] fn (p &Parser) cur_tok() Token {
return p.tokens[p.token_idx - 1]
}
[inline] fn (p &Parser) peek_token() Token {
if p.token_idx >= p.tokens.len - 2 {
return Token{ tok:.eof }
}
return p.tokens[p.token_idx]
}
fn (p &Parser) log(s string) {
/*
if !p.pref.is_verbose {
return
}
println(s)
*/
}
pub fn (p &Parser) save_state() ParserState {
return ParserState{
scanner_line_nr: p.scanner.line_nr
scanner_text : p.scanner.text
scanner_pos : p.scanner.pos
scanner_line_ends : p.scanner.line_ends
scanner_nlines : p.scanner.nlines
cgen_lines : p.cgen.lines
cgen_cur_line : p.cgen.cur_line
cgen_tmp_line : p.cgen.tmp_line
cgen_is_tmp : p.cgen.is_tmp
tokens : p.tokens
token_idx : p.token_idx
tok : p.tok
prev_tok : p.prev_tok
prev_tok2 : p.prev_tok2
lit : p.lit
}
}
pub fn (p mut Parser) restore_state(state ParserState, scanner bool, cgen bool) {
if scanner {
p.scanner.line_nr = state.scanner_line_nr
p.scanner.text = state.scanner_text
p.scanner.pos = state.scanner_pos
p.scanner.line_ends = state.scanner_line_ends
p.scanner.nlines = state.scanner_nlines
}
if cgen {
p.cgen.lines = state.cgen_lines
p.cgen.cur_line = state.cgen_cur_line
p.cgen.tmp_line = state.cgen_tmp_line
p.cgen.is_tmp = state.cgen_is_tmp
}
p.tokens = state.tokens
p.token_idx = state.token_idx
p.tok = state.tok
p.prev_tok = state.prev_tok
p.prev_tok2 = state.prev_tok2
p.lit = state.lit
}
fn (p mut Parser) clear_state(scanner bool, cgen bool) {
if scanner {
p.scanner.line_nr = 0
p.scanner.text = ''
p.scanner.pos = 0
p.scanner.line_ends = []
p.scanner.nlines = 0
}
if cgen {
p.cgen.lines = []
p.cgen.cur_line = ''
p.cgen.tmp_line = ''
p.cgen.is_tmp = false
}
p.tokens = []
p.token_idx = 0
p.lit = ''
}
pub fn (p mut Parser) add_text(text string) {
if p.tokens.len > 1 && p.tokens[p.tokens.len-1].tok == .eof {
p.tokens.delete(p.tokens.len-1)
}
p.scanner.text = p.scanner.text + '\n' + text
p.scan_tokens()
}
fn (p mut Parser) statements_from_text(text string, rcbr bool) {
saved_state := p.save_state()
p.clear_state(true, false)
p.add_text(text)
p.next()
if rcbr {
p.statements()
} else {
p.statements_no_rcbr()
}
p.restore_state(saved_state, true, false)
}
fn (p mut Parser) parse(pass Pass) {
p.cgen.line = 0
p.cgen.file = cescaped_path(os.realpath(p.file_path))
/////////////////////////////////////
p.pass = pass
p.token_idx = 0
p.next()
//p.log('\nparse() run=$p.pass file=$p.file_name tok=${p.strtok()}')// , "script_file=", script_file)
// `module main` is not required if it's a single file program
if p.pref.is_script || p.pref.is_test {
// User may still specify `module main`
if p.tok == .key_module {
p.next()
p.fspace()
p.mod = p.check_name()
} else {
p.mod = 'main'
}
}
else {
p.check(.key_module)
p.fspace()
p.mod = p.check_name()
}
//
p.fgenln('\n')
p.cgen.nogen = false
if p.pref.build_mode == .build_module && p.mod != p.v.mod {
//println('skipping $p.mod (v.mod = $p.v.mod)')
p.cgen.nogen = true
//defer { p.cgen.nogen = false }
}
p.fgenln('\n')
p.builtin_mod = p.mod == 'builtin'
p.can_chash = p.mod in ['ui', 'darwin', 'clipboard', 'webview']// TODO tmp remove
// Import pass - the first and the smallest pass that only analyzes imports
// if we are a building module get the full module name from v.mod
fq_mod := if p.pref.build_mode == .build_module && p.v.mod.ends_with(p.mod) {
p.v.mod
}
// fully qualify the module name, eg base64 to encoding.base64
else {
p.table.qualify_module(p.mod, p.file_path)
}
p.table.register_module(fq_mod)
p.mod = fq_mod
if p.pass == .imports {
for p.tok == .key_import && p.peek() != .key_const {
p.imports()
}
if 'builtin' in p.table.imports {
p.error('module `builtin` cannot be imported')
}
return
}
// Go through every top level token or throw a compilation error if a non-top level token is met
for {
match p.tok {
.key_import {
p.imports()
}
.key_enum {
next := p.peek()
if next == .name {
p.enum_decl(false)
}
else if next == .lcbr && p.pref.translated {
// enum without a name, only allowed in code,
// translated from C. it's a very bad practice
// in C as well, but is used unfortunately
// (for example, by DOOM). such fields are
// basically int consts
p.enum_decl(true)
}
}
.key_pub {
next := p.peek()
match next {
.key_fn { p.fn_decl() }
.key_const { p.const_decl() }
.key_struct,
.key_union,
.key_interface { p.struct_decl() }
.key_enum { p.enum_decl(false) }
.key_type { p.type_decl() }
else {
p.error('wrong pub keyword usage')
}
}
}
.key_fn {
p.fn_decl()
}
.key_type {
p.type_decl()
}
.lsbr {
// `[` can only mean an [attribute] before a function
// or a struct definition
p.attribute()
}
.key_struct, .key_interface, .key_union, .lsbr {
p.struct_decl()
}
.key_const {
p.const_decl()
}
.hash {
// insert C code (only for ui module)
// # puts("hello");
p.chash()
}
.dollar {
// $if, $else
p.comp_time()
}
.key_global {
if !p.pref.translated && !p.pref.is_live &&
!p.builtin_mod && !p.pref.building_v &&
p.mod != 'ui' && !os.getwd().contains('/volt') &&
!p.pref.enable_globals
{
p.error('use `v --enable-globals ...` to enable globals')
//p.error('__global is only allowed in translated code')
}
p.next()
p.fspace()
name := p.check_name()
typ := p.get_type()
p.register_global(name, typ)
// p.genln(p.table.cgen_name_type_pair(name, typ))
mut g := p.table.cgen_name_type_pair(name, typ)
if p.tok == .assign {
p.next()
g += ' = '
_, expr := p.tmp_expr()
g += expr
}
// p.genln('; // global')
g += '; // global'
if !p.cgen.nogen {
p.cgen.consts << g
}
p.fgen_nl()
if p.tok != .key_global {
// An extra empty line to separate a block of globals
p.fgen_nl()
}
}
.eof {
//p.log('end of parse()')
// TODO: check why this was added? everything seems to work
// without it, and it's already happening in fn_decl
// if p.pref.is_script && !p.pref.is_test {
// p.set_current_fn( MainFn )
// p.check_unused_variables()
// }
if !p.first_pass() && !p.pref.is_repl {
p.check_unused_imports()
}
p.gen_fmt() // not generated unless `-d vfmt` is provided
return
}
else {
// no `fn main`, add this "global" statement to cgen.fn_main
if p.pref.is_script && !p.pref.is_test {
// cur_fn is empty since there was no fn main declared
// we need to set it to save and find variables
if p.cur_fn.name == '' {
p.set_current_fn( MainFn )
if p.pref.is_repl {
if p.first_pass() {
return
}
p.clear_vars()
}
}
mut start := p.cgen.lines.len
p.statement(true)
if start > 0 && p.cgen.lines[start - 1] != '' && p.cgen.fn_main != '' {
start--
}
p.genln('')
end := p.cgen.lines.len
lines := p.cgen.lines[start..end]
//mut line := p.cgen.fn_main + lines.join('\n')
//line = line.trim_space()
p.cgen.fn_main = p.cgen.fn_main + lines.join('\n')
p.cgen.resetln('')
for i := start; i < end; i++ {
p.cgen.lines[i] = ''
}
}
else {
p.error('unexpected token `${p.strtok()}`')
}
}
}
}
}
fn (p mut Parser) imports() {
p.check(.key_import)
// `import ()`
if p.tok == .lpar {
p.fspace()
p.check(.lpar)
p.fmt_inc()
p.fgen_nl()
for p.tok != .rpar && p.tok != .eof {
p.import_statement()
p.fgen_nl()
}
p.fmt_dec()
p.check(.rpar)
p.fgenln('\n')
return
}
// `import foo`
p.import_statement()
p.fgen_nl()
if p.tok != .key_import {
p.fgen_nl()
}
}
fn (p mut Parser) import_statement() {
p.fspace()
if p.tok != .name {
p.error('bad import format')
}
if p.peek() == .number {
p.error('bad import format: module/submodule names cannot begin with a number')
}
import_tok_idx := p.token_idx-1
mut mod := p.check_name().trim_space()
mut mod_alias := mod
// submodule support
mut depth := 1
for p.tok == .dot {
p.check(.dot)
submodule := p.check_name()
mod_alias = submodule
mod += '.' + submodule
depth++
if depth > max_module_depth {
p.error('module depth of $max_module_depth exceeded: $mod')
}
}
// aliasing (import encoding.base64 as b64)
if p.tok == .key_as && p.peek() == .name {
p.check(.key_as)
mod_alias = p.check_name()
}
// add import to file scope import table
p.register_import_alias(mod_alias, mod, import_tok_idx)
// Make sure there are no duplicate imports
if mod in p.table.imports {
return
}
//p.log('adding import $mod')
p.table.imports << mod
p.table.register_module(mod)
}
fn (p mut Parser) const_decl() {
//println('const decl $p.file_path')
is_pub := p.tok == .key_pub
if is_pub {
p.next()
}
p.inside_const = true
p.check(.key_const)
p.fspace()
p.check(.lpar)
p.fgen_nl()
p.fmt_inc()
for p.tok == .name {
if p.lit == '_' && p.peek() == .assign && !p.cgen.nogen {
p.gen_blank_identifier_assign()
//if !p.cgen.nogen {
p.cgen.consts_init << p.cgen.cur_line.trim_space()
p.cgen.resetln('')
//}
continue
}
mut name := p.check_name() // `Age = 20`
//if !p.pref.building_v && p.mod != 'os' && contains_capital(name) {
//p.warn('const names cannot contain uppercase letters, use snake_case instead')
//}
name = p.prepend_mod(name)
mut typ := ''
if p.is_vh {
//println('CONST VH $p.file_path')
// .vh files may not have const values, just types: `const (a int)`
if p.tok == .assign {
p.next()
// Otherwise parse the expression to get its type,
// but don't generate it. Const's value is generated
// in "module.o".
p.cgen.nogen = true
typ = p.expression()
p.cgen.nogen = false
} else {
typ = p.get_type()
}
p.table.register_const(name, typ, p.mod, is_pub)
p.cgen.consts << ('extern ' +
p.table.cgen_name_type_pair(name, typ)) + ';'
continue // Don't generate C code when building a .vh file
} else {
p.check_space(.assign)
typ = p.expression()
}
if p.first_pass() && p.table.known_const(name) {
p.error('redefinition of `$name`')
}
if p.first_pass() {
p.table.register_const(name, typ, p.mod, is_pub)
}
// Check to see if this constant exists, and is void. If so, try and get the type again:
if my_const := p.v.table.find_const(name) {
if my_const.typ == 'void' {
for i, v in p.v.table.consts {
if v.name == name {
p.v.table.consts[i].typ = typ
break
}
}
}
}
if p.pass == .main && p.cgen.nogen && p.pref.build_mode == .build_module {
// We are building module `ui`, but are parsing `gx` right now
// (because of nogen). We need to import gx constants with `extern`.
//println('extern const mod=$p.mod name=$name')
p.cgen.consts << ('extern ' +
p.table.cgen_name_type_pair(name, typ)) + ';'
}
if p.pass == .main && !p.cgen.nogen {
// TODO hack
// cur_line has const's value right now. if it's just a number, then optimize generation:
// output a #define so that we don't pollute the binary with unnecessary global vars
// Do not do this when building a module, otherwise the consts
// will not be accessible.
if p.pref.build_mode != .build_module && is_compile_time_const(p.cgen.cur_line) {
p.cgen.const_defines << '#define $name $p.cgen.cur_line'
p.cgen.resetln('')
p.fgen_nl()
continue
}
if typ.starts_with('[') {
p.cgen.consts << p.table.cgen_name_type_pair(name, typ) +
' = $p.cgen.cur_line;'
}
else {
p.cgen.consts << p.table.cgen_name_type_pair(name, typ) + ';'
//println('adding to init "$name"')
p.cgen.consts_init << '$name = $p.cgen.cur_line;'
}
p.cgen.resetln('')
}
p.fgen_nl()
}
p.fmt_dec()
p.check(.rpar)
p.inside_const = false
}
// `type myint int`
// `type onclickfn fn(voidptr) int`
fn (p mut Parser) type_decl() {
is_pub := p.tok == .key_pub
if is_pub {
p.next()
}
p.check(.key_type)
name := p.check_name()
// V used to have 'type Foo struct', many Go users might use this syntax
if p.tok == .key_struct {
p.error('use `struct $name {` instead of `type $name struct {`')
}
parent := p.get_type2()
nt_pair := p.table.cgen_name_type_pair(name, parent.name)
// TODO dirty C typedef hacks for DOOM
// Unknown type probably means it's a struct, and it's used before the struct is defined,
// so specify "struct"
_struct := if parent.cat != .array && parent.cat != .func &&
!p.table.known_type(parent.name) {
'struct'
} else {
''
}
p.gen_typedef('typedef $_struct $nt_pair; //type alias name="$name" parent=`$parent.name`')
p.table.register_type(Type{
name: name
parent: parent.name
mod: p.mod
cat: .alias
is_public: is_pub
})
}
// current token is `(`
fn (p mut Parser) interface_method(field_name, receiver string) &Fn {
mut method := &Fn {
name: field_name
is_interface: true
is_method: true
receiver_typ: receiver
}
//p.log('is interface. field=$field_name run=$p.pass')
p.fn_args(mut method)
prev_tok := p.prev_token()
cur_tok := p.cur_tok()
// No type on the same line, this method doesn't return a type, process next
if prev_tok.line_nr != cur_tok.line_nr {
method.typ = 'void'
} else {
method.typ = p.get_type()// method return type
//p.fspace()
p.fgen_nl()
}
return method
}
fn key_to_type_cat(tok TokenKind) TypeCategory {
match tok {
.key_interface { return .interface_ }
.key_struct { return .struct_ }
.key_union { return .union_ }
else {}
}
verror('Unknown token: $tok')
return .builtin
}
// check_name checks for a name token and returns its literal
fn (p mut Parser) check_name() string {
name := p.lit
p.check(.name)
return name
}
fn (p mut Parser) check_string() string {
s := p.lit
p.check(.str)
return s
}
fn (p mut Parser) check_not_reserved () {
if reserved_types[p.lit] {
p.error('`$p.lit` can\'t be used as name')
}
}
fn (p &Parser) strtok() string {
if p.tok == .name {
return p.lit
}
if p.tok == .number {
return p.lit
}
if p.tok == .chartoken {
return '`$p.lit`'
}
if p.tok == .str {
if p.lit.contains("'") {
return '"$p.lit"'
} else {
return "'$p.lit'"
}
}
res := p.tok.str()
if res == '' {
n := int(p.tok)
return n.str()
}
return res
}
// same as check(), but adds a space to the formatter output
// TODO bad name
fn (p mut Parser) check_space(expected TokenKind) {
p.fspace()
p.check(expected)
p.fspace()
}
fn (p mut Parser) check(expected TokenKind) {
if p.tok != expected {
//println('check()')
s := 'syntax error: unexpected `${p.strtok()}`, expecting `${expected.str()}`'
p.next()
println('next token = `${p.strtok()}`')
if p.pref.is_debug {
print_backtrace()
}
p.error(s)
}
/*
if expected == .rcbr {
p.fmt_dec()
}
p.fgen(p.strtok())
// vfmt: increase indentation on `{` unless it's `{}`
if expected == .lcbr { //&& p.scanner.pos + 1 < p.scanner.text.len && p.scanner.text[p.scanner.pos + 1] != `}` {
p.fgen_nl()
p.fmt_inc()
}
*/
p.next()
//if p.scanner.line_comment != '' {
//p.fgenln('// ! "$p.scanner.line_comment"')
//p.scanner.line_comment = ''
//}
}
[inline]
fn (p &Parser) first_pass() bool {
return p.pass == .decl
}
// TODO return Type instead of string?
fn (p mut Parser) get_type() string {
mut mul := false
mut nr_muls := 0
mut typ := ''
// multiple returns
if p.tok == .lpar {
//p.warn('`()` are no longer necessary in multiple returns' +
//'\nuse `fn foo() int, int {` instead of `fn foo() (int, int) {`')
// if p.inside_tuple {p.error('unexpected (')}
// p.inside_tuple = true
p.check(.lpar)
mut types := []string
for {
types << p.get_type()
if p.tok != .comma {
break
}
p.check(.comma)
}
p.check(.rpar)
// p.inside_tuple = false
typ = p.register_multi_return_stuct(types)
return typ
}
// fn type
if p.tok == .key_fn {
mut f := Fn{name: '_', mod: p.mod}
p.next()
line_nr := p.scanner.line_nr
p.fn_args(mut f)
// Same line, it's a return type
if p.scanner.line_nr == line_nr {
if p.tok in [.name, .mul, .amp, .lsbr, .question, .lpar] {
f.typ = p.get_type()
}
else {
f.typ = 'void'
}
// println('fn return typ=$f.typ')
}
else {
f.typ = 'void'
}
// Register anon fn type
fn_typ := Type {
name: f.typ_str()// 'fn (int, int) string'
mod: p.mod
func: f
}
p.table.register_type(fn_typ)
return f.typ_str()
}
// arrays ([]int)
mut arr_level := 0
is_question := p.tok == .question
if is_question {
p.check(.question)
}
for p.tok == .lsbr {
p.check(.lsbr)
// [10]int
if p.tok == .number {
typ += '[$p.lit]'
p.next()
}
else {
arr_level++
}
p.check(.rsbr)
}
// map[string]int
if !p.builtin_mod && p.tok == .name && p.lit == 'map' {
p.next()
p.check(.lsbr)
key_type := p.check_name()
if key_type != 'string' {
p.error('maps only support string keys for now')
}
p.check(.rsbr)
val_type := p.get_type()// p.check_name()
typ = 'map_$val_type'
p.register_map(typ)
return typ
}
// ptr/ref
mut warn := false
for p.tok == .mul {
if p.first_pass() {
warn = true
}
mul = true
nr_muls++
p.check(.mul)
}
if p.tok == .amp {
mul = true
nr_muls++
p.check(.amp)
}
// generic type check
ti := p.cur_fn.dispatch_of.inst
if p.lit in ti.keys() {
typ += ti[p.lit]
} else {
typ += p.lit
}
// C.Struct import
if p.lit == 'C' && p.peek() == .dot {
p.next()
p.check(.dot)
typ = p.lit
}
else {
if warn && p.mod != 'ui' {
p.warn('use `&Foo` instead of `*Foo`')
}
// Module specified? (e.g. gx.Image)
if p.peek() == .dot {
// try resolve full submodule
if !p.builtin_mod && p.import_table.known_alias(typ) {
mod := p.import_table.resolve_alias(typ)
if mod.contains('.') {
typ = mod_gen_name(mod)
}
}
p.next()
p.check(.dot)
typ += '__$p.lit'
}
mut t := p.table.find_type(typ)
// "typ" not found? try "mod__typ"
if t.name == '' && !p.builtin_mod {
// && !p.first_pass() {
if !typ.contains('array_') && p.mod != 'main' && !typ.contains('__') &&
!typ.starts_with('[') {
typ = p.prepend_mod(typ)
}
t = p.table.find_type(typ)
if t.name == '' && !p.pref.translated && !p.first_pass() && !typ.starts_with('[') {
println('get_type() bad type')
// println('all registered types:')
// for q in p.table.types {
// println(q.name)
// }
mut t_suggest, tc_suggest := p.table.find_misspelled_type(typ, p, 0.50)
if t_suggest.len > 0 {
t_suggest = '. did you mean: ($tc_suggest) `$t_suggest`'
}
p.error('unknown type `$typ`$t_suggest')
}
}
else if !t.is_public && t.mod != p.mod && !p.is_vgen && t.name != '' && !p.first_pass() {
p.error('type `$t.name` is private')
}
}
if typ == 'void' {
p.error('unknown type `$typ`')
}
if mul {
typ += strings.repeat(`*`, nr_muls)
}
// Register an []array type
if arr_level > 0 {
// p.log('ARR TYPE="$typ" run=$p.pass')
// We come across "[]User" etc ?
for i := 0; i < arr_level; i++ {
typ = 'array_$typ'
}
p.register_array(typ)
}
p.next()
if is_question {
typ = 'Option_$typ'
p.table.register_type_with_parent(typ, 'Option')
}
// Because the code uses * to see if it's a pointer
if typ == 'byteptr' {
return 'byte*'
}
if typ == 'voidptr' {
//if !p.builtin_mod && p.mod != 'os' && p.mod != 'gx' && p.mod != 'gg' && !p.pref.translated {
//p.error('voidptr can only be used in unsafe code')
//}
return 'void*'
}
/*
TODO this is not needed?
if typ.last_index('__') > typ.index('__') {
p.error('2 __ in gettype(): typ="$typ"')
}
*/
return typ
}
fn (p &Parser) print_tok() {
if p.tok == .name {
println(p.lit)
return
}
if p.tok == .str {
println('"$p.lit"')
return
}
println(p.tok.str())
}
// statements() returns the type of the last statement
fn (p mut Parser) statements() string {
//p.log('statements()')
typ := p.statements_no_rcbr()
if !p.inside_if_expr {
p.genln('}')
}
//if p.fileis('if_expr') {
//println('statements() ret=$typ line=$p.scanner.line_nr')
//}
return typ
}
fn (p mut Parser) statements_no_rcbr() string {
p.open_scope()
if !p.inside_if_expr {
//p.genln('')
}
mut i := 0
mut last_st_typ := ''
for p.tok != .rcbr && p.tok != .eof {
// println('stm: '+p.tok.str()+', next: '+p.peek().str())
last_st_typ = p.statement(true)
// println('last st typ=$last_st_typ')
if !p.inside_if_expr {
//p.genln('')// // end st tok= ${p.strtok()}')
p.fgen_nl()
}
i++
if i > 50000 {
p.cgen.save()
p.error('more than 50 000 statements in function `$p.cur_fn.name`')
}
}
// p.next()
p.check(.rcbr)
//p.fmt_dec()
p.close_scope()
return last_st_typ
}
fn (p mut Parser) close_scope() {
// println('close_scope level=$f.scope_level var_idx=$f.var_idx')
// Move back `var_idx` (pointer to the end of the array) till we reach
// the previous scope level. This effectivly deletes (closes) current
// scope.
mut i := p.var_idx - 1
for ; i >= 0; i-- {
v := p.local_vars[i]
if p.pref.autofree && (v.is_alloc || (v.is_arg && v.typ == 'string')) { // && !p.pref.is_test {
p.free_var(v)
}
//if p.fileis('mem.v') {
//println(v.name + ' $v.is_arg scope=$v.scope_level cur=$p.cur_fn.scope_level')}
if v.scope_level != p.cur_fn.scope_level {// && !v.is_arg {
break
}
}
if p.cur_fn.defer_text.last() != '' {
p.genln(p.cur_fn.defer_text.last())
//p.cur_fn.defer_text[f] = ''
}
p.cur_fn.scope_level--
p.cur_fn.defer_text = p.cur_fn.defer_text[..p.cur_fn.scope_level + 1]
p.var_idx = i + 1
// println('close_scope new var_idx=$f.var_idx\n')
}
fn (p mut Parser) free_var(v Var) {
// Clean up memory, only do this if -autofree was passed for now
//if p.fileis('mem.v') {println('free_var() $v.name')}
//println(p.cur_fn.name)
if p.cur_fn.name in ['add', 'clone', 'free'] {
return
}
mut free_fn := 'free'
if v.typ.starts_with('array_') {
free_fn = 'v_array_free'
} else if v.typ == 'string' {
free_fn = 'v_string_free'
//if p.fileis('str.v') {
//println('freeing str $v.name')
//}
//continue
} else if v.ptr || v.typ.ends_with('*') {
free_fn = 'v_ptr_free'
//continue
} else {
return
}
if p.returns {
// Don't free a variable that's being returned
if !v.is_returned && v.typ != 'FILE*' { //!v.is_c {
//p.cgen.cur_line = '/* free */' + p.cgen.cur_line
//p.cgen.set_placeholder(0, '/*free2*/')
prev_line := p.cgen.lines[p.cgen.lines.len-1]
free := '$free_fn ($v.name); /* :) close_scope free $v.typ */'
p.cgen.lines[p.cgen.lines.len-1] = free + '\n' + prev_line
//'$free_fn ($v.name); /* :) close_scope free $v.typ */\n' + prev_line
}
} else if p.mod != 'strings' { //&& p.mod != 'builtin' {
/*
prev_line := p.cgen.lines[p.cgen.lines.len-1]
free := '$free_fn ($v.name); /* :) close_scope free $v.typ */'
p.cgen.lines[p.cgen.lines.len-1] = free + '\n' + prev_line
*/
//if p.fileis('mem.v') {println(v.name)}
p.genln('$free_fn ($v.name); // close_scope free')
}
}
fn (p mut Parser) genln(s string) {
p.cgen.genln(s)
}
fn (p mut Parser) gen(s string) {
p.cgen.gen(s)
}
// Generate V header from V source
fn (p mut Parser) statement(add_semi bool) string {
p.expected_type = ''
if p.returns {
p.error('unreachable code')
}
// if !p.in_dispatch {
p.cgen.is_tmp = false
// }
tok := p.tok
mut q := ''
match tok {
.name {
next := p.peek()
//if p.pref.is_verbose {
//println(next.str())
//}
// goto_label:
if p.peek() == .colon {
p.fmt_dec()
label := p.check_name()
p.fmt_inc()
p.genln(label + ': ;')
p.check(.colon)
return ''
}
// `a := 777`
else if p.peek() == .decl_assign || p.peek() == .comma {
p.check_not_reserved()
//p.log('var decl')
p.var_decl()
}
// `_ = 777`
else if p.lit == '_' && p.peek() == .assign {
p.gen_blank_identifier_assign()
}
else {
// panic and exit count as returns since they stop the function
is_panic := p.lit == 'panic' || p.lit == 'exit'
if is_panic {
p.returns = true
}
// `a + 3`, `a(7)`, or just `a`
q = p.bool_expression()
// Fix "control reaches end of non-void function" error
if is_panic && p.cur_fn.typ == 'bool' {
p.genln(';\nreturn false;')
}
}
}
.key_goto {
p.check(.key_goto)
p.fspace()
label := p.check_name()
p.genln('goto $label;')
return ''
}
.key_defer {
p.defer_st()
return ''
}
.hash {
p.chash()
return ''
}
.key_unsafe {
p.next()
p.inside_unsafe = true
p.check(.lcbr)
p.genln('{')
p.statements()
p.inside_unsafe = false
//p.check(.rcbr)
}
.dollar {
p.comp_time()
}
.key_if {
p.if_statement(false, 0)
}
.key_for {
p.for_st()
}
.key_switch {
p.switch_statement()
}
.key_match {
p.match_statement(false)
}
.key_mut, .key_static {
p.var_decl()
}
.key_return {
p.return_st()
}
.lcbr {// {} block
// Do not allow {} block to start on the same line
// to avoid e.g. `foo() {` instead of `if foo() {`
if p.prev_token().line_nr == p.scanner.line_nr {
p.genln('')
p.error('{} block has to start on a new line')
}
p.check(.lcbr)
if p.tok == .rcbr {
p.error('empty statements block')
}
p.genln('{')
p.statements()
return ''
}
.key_continue {
if p.for_expr_cnt == 0 {
p.error('`continue` statement outside `for`')
}
p.genln('continue')
p.check(.key_continue)
}
.key_break {
if p.for_expr_cnt == 0 {
p.error('`break` statement outside `for`')
}
p.genln('break')
p.check(.key_break)
}
.key_go {
p.go_statement()
}
.key_assert {
p.assert_statement()
}
.key_asm {
p.inline_asm()
}
else {
// An expression as a statement
typ := p.expression()
if p.inside_if_expr {
}
else {
p.genln('; ')
}
return typ
}
}
// ? : uses , as statement separators
if p.inside_if_expr && p.tok != .rcbr {
p.gen(', ')
}
if add_semi && !p.inside_if_expr {
p.genln(';')
}
return q
// p.cgen.end_statement()
}
// is_map: are we in map assignment? (m[key] = val) if yes, dont generate '='
// this can be `user = ...` or `user.field = ...`, in both cases `v` is `user`
fn (p mut Parser) assign_statement(v Var, ph int, is_map bool) {
errtok := p.cur_tok_index()
is_vid := p.fileis('vid') // TODO remove
tok := p.tok
//if !v.is_mut && !v.is_arg && !p.pref.translated && !v.is_global{
if !v.is_mut && !p.pref.translated && !v.is_global && !is_vid {
if v.is_arg {
if p.cur_fn.args.len > 0 && p.cur_fn.args[0].name == v.name {
println('make the receiver `$v.name` mutable:
fn ($v.name mut $v.typ) ${p.cur_fn.name}(...) {
')
}
}
p.error('`$v.name` is immutable')
}
if !v.is_changed {
p.mark_var_changed(v)
}
is_str := p.expected_type == 'string'
is_ustr := p.expected_type == 'ustring'
match tok {
.assign {
if !is_map && !p.is_empty_c_struct_init {
p.gen(' = ')
}
}
.plus_assign {
if is_str && !p.is_js {
expr := p.cgen.cur_line
p.gen('= string_add($expr, ')
}
else if is_ustr {
p.gen('= ustring_add($v.name, ')
}
else {
next := p.peek_token()
if next.tok == .number && next.lit== '1' {
p.error('use `++` instead of `+= 1`')
}
p.gen(' += ')
}
}
else {
p.gen(' ' + p.tok.str() + ' ')
}
}
p.fspace()
p.next()
p.fspace()
pos := p.cgen.cur_line.len
p.is_var_decl = true
expr_type := p.bool_expression()
p.is_var_decl = false
//if p.expected_type.starts_with('array_') {
//p.warn('expecting array got $expr_type')
//}
if expr_type == 'void' {
_, fn_name := p.is_expr_fn_call(p.token_idx-3)
p.error_with_token_index('${fn_name}() $err_used_as_value', p.token_idx-2)
}
// Allow `num = 4` where `num` is an `?int`
if p.assigned_type.starts_with('Option_') &&
expr_type == p.assigned_type['Option_'.len..] {
expr := p.cgen.cur_line[pos..]
left := p.cgen.cur_line[..pos]
typ := expr_type.replace('Option_', '')
p.cgen.resetln(left + 'opt_ok(($typ[]){ $expr }, sizeof($typ))')
}
else if expr_type.starts_with('Option_') &&
p.assigned_type == expr_type['Option_'.len..] && p.tok == .key_orelse
{
line := p.cgen.cur_line
vname := line[..pos].replace('=','') // TODO cgen line hack
if idx := line.index('=') {
p.cgen.resetln(line.replace(line[..idx+1], ''))
p.gen_handle_option_or_else(expr_type, vname, ph)
}
}
else if expr_type[0]==`[` {
// assignment to a fixed_array `mut a:=[3]int a=[1,2,3]!!`
expr := p.cgen.cur_line[pos..].all_after('{').all_before('}') // TODO cgen line hack
left := p.cgen.cur_line[..pos].all_before('=')
cline_pos := p.cgen.cur_line[pos..]
etype := cline_pos.all_before(' {')
if p.assigned_type != p.expected_type {
p.error_with_token_index( 'incompatible types: $p.assigned_type != $p.expected_type', errtok)
}
p.cgen.resetln('memcpy( (& $left), ($etype{$expr}), sizeof( $left ) );')
}
// check type for <<= >>= %= ^= &= |=
else if tok in [.left_shift_assign, .righ_shift_assign, .mod_assign, .xor_assign, .and_assign, .or_assign] {
if !is_integer_type(p.assigned_type) {
p.error_with_token_index( 'cannot use ${tok.str()} assignment operator on non-integer type `$p.assigned_type`', errtok)
}
if !is_integer_type(expr_type) {
p.error_with_token_index( 'cannot use non-integer type `$expr_type` as ${tok.str()} argument', errtok)
}
}
else if !p.builtin_mod && !p.check_types_no_throw(expr_type, p.assigned_type) {
t := p.table.find_type( p.assigned_type)
if t.cat == .enum_ && t.is_flag {
p.error_with_token_index(err_modify_bitfield, errtok)
}
p.error_with_token_index( 'cannot use type `$expr_type` as type `$p.assigned_type` in assignment', errtok)
}
if (is_str || is_ustr) && tok == .plus_assign && !p.is_js {
p.gen(')')
}
// p.assigned_var = ''
p.assigned_type = ''
if !v.is_used {
p.mark_var_used(v)
}
}
fn (p mut Parser) var_decl() {
p.is_alloc = false
is_mut := p.tok == .key_mut || p.prev_tok == .key_for
is_static := p.tok == .key_static
if p.tok == .key_mut {
p.check(.key_mut)
p.fspace()
}
if p.tok == .key_static {
p.check(.key_static)
p.fspace()
}
mut var_token_idxs := [p.cur_tok_index()]
mut var_mut := [is_mut] // add first var mut
mut var_names := [p.check_name()] // add first variable
p.scanner.validate_var_name(var_names[0])
mut new_vars := 0
if var_names[0] != '_' && !p.known_var(var_names[0]) {
new_vars++
}
// more than 1 vars (multiple returns)
for p.tok == .comma {
p.check(.comma)
if p.tok == .key_mut {
p.check(.key_mut)
var_mut << true
} else {
var_mut << false
}
var_token_idxs << p.cur_tok_index()
var_name := p.check_name()
p.scanner.validate_var_name(var_name)
if var_name != '_' && !p.known_var(var_name) {
new_vars++
}
var_names << var_name
}
is_assign := p.tok == .assign
is_decl_assign := p.tok == .decl_assign
if is_assign {
p.check_space(.assign) // =
} else if is_decl_assign {
p.check_space(.decl_assign) // :=
} else {
p.error('expected `=` or `:=`')
}
// all vars on left of `:=` already defined (or `_`)
if is_decl_assign && var_names.len == 1 && var_names[0] == '_' {
p.error_with_token_index('use `=` instead of `:=`', var_token_idxs.last())
}
p.var_decl_name = if var_names.len > 1 { '_V_mret_${p.token_idx}_'+var_names.join('_') } else { var_names[0] }
t := p.gen_var_decl(p.var_decl_name, is_static)
if t == 'void' {
_, fn_name := p.is_expr_fn_call(p.token_idx-3)
p.error_with_token_index('${fn_name}() $err_used_as_value', p.token_idx-2)
}
mut var_types := [t]
// multiple returns types
if var_names.len > 1 {
var_types = t.replace('_V_MulRet_', '').replace('_PTR_', '*').split('_V_')
}
// mismatched number of return & assignment vars
if var_names.len != var_types.len {
mr_fn := p.cgen.cur_line.find_between('=', '(').trim_space()
p.error_with_token_index('assignment mismatch: ${var_names.len} variables but `$mr_fn` returns $var_types.len values', var_token_idxs.last())
}
for i, var_name in var_names {
var_token_idx := var_token_idxs[i]
var_is_mut := var_mut[i]
var_type := var_types[i]
known_var := p.known_var(var_name)
if var_name == '_' {
if var_is_mut {
p.error_with_token_index('`mut` has no effect here', var_token_idx-1)
}
continue
}
// println('var decl tok=${p.strtok()} name=type=$var_name type=$var_type ismut=$var_is_mut')
// var decl, already exists (shadowing is not allowed)
// Don't allow declaring a variable with the same name. Even in a child scope
// if var_names.len == 1 && !p.builtin_mod && known_var {
if is_decl_assign && known_var {
p.error_with_token_index('redefinition of `$var_name`', var_token_idx)
}
// mut specified with assignment
//if /*is_assign && implicit*/ known_var && var_is_mut {
if known_var && var_is_mut {
p.error_with_token_index('cannot specify mutability for existing var `$var_name`, only for new vars', var_token_idx)
}
// assignment, but var does not exist
if is_assign && !known_var {
suggested := p.find_misspelled_local_var(var_name, 50)
if suggested != '' {
p.error_with_token_index('undefined: `$var_name`. did you mean:$suggested', var_token_idx)
}
p.error_with_token_index('undefined: `$var_name`.', var_token_idx)
}
if var_name.len > 1 && contains_capital(var_name) {
p.error_with_token_index('variable names cannot contain uppercase letters, use snake_case instead', var_token_idx)
}
// multiple return
if var_names.len > 1 {
p.gen(';\n')
// assigment
// if !p.builtin_mod && known_var {
if known_var {
v := p.find_var(var_name) or {
p.error_with_token_index('cannot find `$var_name`', var_token_idx)
break
}
p.check_types_with_token_index(var_type, v.typ, var_token_idx)
if !v.is_mut {
p.error_with_token_index('`$v.name` is immutable', var_token_idx)
}
p.mark_var_used(v)
p.mark_var_changed(v)
p.gen('$var_name = ${p.var_decl_name}.var_$i')
continue
}
// declaration
p.gen('$var_type $var_name = ${p.var_decl_name}.var_$i')
}
p.register_var(Var {
name: var_name
typ: var_type
is_mut: var_is_mut
is_alloc: p.is_alloc || var_type.starts_with('array_')
line_nr: p.tokens[ var_token_idx ].line_nr
token_idx: var_token_idx
})
//if p.fileis('str.v') {
//if p.is_alloc { println('REG VAR IS ALLOC $name') }
//}
}
p.var_decl_name = ''
p.is_empty_c_struct_init = false
}
fn (p mut Parser) get_struct_type(name_ string, is_c bool, is_ptr bool) string {
mut name := name_
if is_ptr {
name += '*' // `&User{}` => type `User*`
}
if name in reserved_type_param_names {
p.warn('name `$name` is reserved for type parameters')
}
p.is_c_struct_init = is_c
return p.struct_init(name)
}
fn (p mut Parser) get_var_type(name string, is_ptr bool, deref_nr int) string {
v := p.find_var_check_new_var(name) or { return "" }
if is_ptr {
p.gen('&')
}
else if deref_nr > 0 {
for _ in 0..deref_nr {
p.gen('*')
}
}
/*
if p.pref.autofree && v.typ == 'string' && v.is_arg &&
p.assigned_type == 'string' {
p.warn('setting moved ' + v.typ)
p.mark_arg_moved(v)
}
*/
mut typ := p.var_expr(v)
// *var
if deref_nr > 0 {
/*
if !p.inside_unsafe && !p.pref.building_v && p.mod != 'os' {
p.error('dereferencing can only be done inside an `unsafe` block')
}
*/
if !typ.contains('*') && !typ.ends_with('ptr') {
println('name="$name", t=$v.typ')
p.error('dereferencing requires a pointer, but got `$typ`')
}
for _ in 0..deref_nr {
typ = typ.replace_once('ptr', '')// TODO
typ = typ.replace_once('*', '')// TODO
}
}
// &var
else if is_ptr {
typ += '*'
}
if p.inside_return_expr {
//println('marking $v.name returned')
p.mark_var_returned(v)
// v.is_returned = true // TODO modifying a local variable
// that's not used afterwards, this should be a compilation
// error
}
return typ
}
fn (p mut Parser) get_const_type(name string, is_ptr bool) string {
c := p.table.find_const(name) or { return "" }
if is_ptr && !c.is_global {
p.error('cannot take the address of constant `$c.name`')
} else if is_ptr && c.is_global {
// c.ptr = true
p.gen('& /*const*/ ')
}
if !c.is_public && c.mod != p.mod {
p.warn('constant `$c.name` is private')
}
mut typ := p.var_expr(c)
if is_ptr {
typ += '*'
}
return typ
}
fn (p mut Parser) get_c_func_type(name string) string {
f := Fn {
name: name
is_c: true
}
p.is_c_fn_call = true
p.fn_call(mut f, 0, '', '')
p.is_c_fn_call = false
// C functions must be defined with `C.fn_name() fn_type`
cfn := p.table.find_fn(name) or {
// Is the user trying to do `var := C.foo()` or `bar(C.foo())`
// without declaring `foo`?
// Do not allow it.
if !name.starts_with('gl') && !name.starts_with('glad') {
p.error('undefined C function `$f.name`\n' +
'define it with `fn C.${name}([args]) [return_type]`')
}
return 'void*'
}
// println("C fn $name has type $cfn.typ")
return cfn.typ
}
fn (p mut Parser) undefined_error(name string, orig_name string) {
name_dotted := mod_gen_name_rev(name.replace('__', '.'))
// check for misspelled function / variable / module / type
suggested := p.identify_typo(name)
if suggested.len != 0 {
p.error('undefined: `$name_dotted`. did you mean:\n$suggested\n')
}
// If orig_name is a mod, then printing undefined: `mod` tells us nothing
if p.table.known_mod(orig_name) || p.import_table.known_alias(orig_name) {
p.error('undefined: `$name_dotted` (in module `$orig_name`)')
} else if orig_name in reserved_type_param_names {
p.error('the letter `$orig_name` is reserved for type parameters')
}
p.error('undefined: `$orig_name`')
}
fn (p mut Parser) var_expr(v Var) string {
//p.log('\nvar_expr() v.name="$v.name" v.typ="$v.typ"')
// println('var expr is_tmp=$p.cgen.is_tmp\n')
if !v.is_const {
p.mark_var_used(v)
// `C.foo(&var)` means that `var` is changed. Mark it as changed
// to avoid `var was declared as mutable but was never changed` errors.
if p.calling_c && !v.is_changed {
//println('marking C var changed: $v.name')
p.mark_var_changed(v)
}
}
fn_ph := p.cgen.add_placeholder()
p.expr_var = v
p.gen(p.table.var_cgen_name(v.name))
p.next()
mut typ := v.typ
// Function pointer?
if typ.starts_with('fn ') && p.tok == .lpar {
T := p.table.find_type(typ)
p.gen('(')
p.fn_call_args(mut T.func)
p.gen(')')
typ = T.func.typ
}
// users[0].name
if p.tok == .lsbr {
typ = p.index_expr(typ, fn_ph)
}
// a.b.c().d chain
// mut dc := 0
for p.tok ==.dot {
if p.peek() == .key_select {
p.next()
return p.select_query(fn_ph)
}
if typ == 'pg__DB' && !p.fileis('pg.v') && p.peek() == .name
{
name := p.tokens[p.token_idx].lit
if !name.contains('exec') && !name.starts_with('q_') {
p.next()
if name == 'insert' {
p.insert_query(fn_ph)
} else if name == 'update' {
p.update_query(fn_ph)
}
return 'void'
}
}
// println('dot #$dc')
typ = p.dot(typ, fn_ph)
//p.log('typ after dot=$typ')
// print('tok after dot()')
// p.print_tok()
// dc++
if p.tok == .lsbr {
// typ = p.index_expr(typ, fn_ph, v)
}
}
// `a++` and `a--`
if p.tok == .inc || p.tok == .dec {
if !v.is_mut && !p.pref.translated {
p.error('`$v.name` is immutable')
}
if !v.is_changed {
p.mark_var_changed(v)
}
if typ != 'int' && !typ.contains('*') {
if !p.pref.translated && !is_number_type(typ) {
p.error('cannot ++/-- value of type `$typ`')
}
}
p.gen(p.tok.str())
p.next()// ++/--
// allow `a := c++` in translated code TODO remove once c2v handles this
if p.pref.translated {
//return p.index_expr(typ, fn_ph)
}
else {
return typ
}
}
typ = p.index_expr(typ, fn_ph)
// TODO hack to allow `foo.bar[0] = 2`
if p.tok == .dot {
for p.tok == .dot {
typ = p.dot(typ, fn_ph)
}
typ = p.index_expr(typ, fn_ph)
}
return typ
}
// user.name => `str_typ` is `User`
// user.company.name => `str_typ` is `Company`
fn (p mut Parser) dot(str_typ_ string, method_ph int) string {
//if p.fileis('orm_test') {
//println('ORM dot $str_typ')
//}
str_typ := str_typ_
p.check(.dot)
is_variadic_arg := str_typ.starts_with('varg_')
typ := p.find_type(str_typ)
if typ.name.len == 0 {
p.error('dot(): cannot find type `$str_typ`')
}
// foo.$action()
if p.tok == .dollar {
p.comptime_method_call(typ)
return 'void'
}
field_name := p.lit
if field_name == 'filter' && str_typ.starts_with('array_') {
p.gen_array_filter(str_typ, method_ph)
return str_typ
}
else if field_name == 'map' && str_typ.starts_with('array_') {
return p.gen_array_map(str_typ, method_ph)
}
fname_tidx := p.cur_tok_index()
//p.log('dot() field_name=$field_name typ=$str_typ')
//if p.fileis('main.v') {
//println('dot() field_name=$field_name typ=$str_typ prev_tok=${prev_tok.str()}')
//}
has_field := p.table.type_has_field(typ, p.table.var_cgen_name(field_name))
mut has_method := p.table.type_has_method(typ, field_name)
if is_variadic_arg && field_name == 'len' {
p.gen('->$field_name')
p.next()
return 'int'
}
// generate `.str()`
if !has_method && field_name == 'str' && typ.name.starts_with('array_') {
p.gen_array_str(typ)
has_method = true
}
if !typ.is_c && !p.is_c_fn_call && !has_field && !has_method && !p.first_pass() {
if typ.name.starts_with('Option_') {
opt_type := typ.name[7..]
p.error('unhandled option type: `?$opt_type`')
}
//println('error in dot():')
//println('fields:')
//for field in typ.fields {
//println(field.name)
//}
//println('methods:')
//for field in typ.methods {
//println(field.name)
//}
//println('str_typ=="$str_typ"')
p.error_with_token_index('type `$typ.name` has no field or method `$field_name`', fname_tidx)
}
mut dot := '.'
if str_typ.ends_with('*') || str_typ == 'FT_Face' { // TODO fix C ptr typedefs
dot = dot_ptr
}
// field
if has_field {
struct_field := if typ.name != 'Option' { p.table.var_cgen_name(field_name) } else { field_name }
field := p.table.find_field(typ, struct_field) or {
p.error_with_token_index('missing field: $struct_field in type $typ.name', fname_tidx)
exit(1)
}
if !field.is_mut && !p.has_immutable_field {
p.has_immutable_field = true
p.first_immutable_field = field
}
// Is the next token `=`, `+=` etc? (Are we modifying the field?)
next := p.peek()
modifying := next.is_assign() || next == .inc || next == .dec ||
(field.typ.starts_with('array_') && next == .left_shift)
if !p.builtin_mod && !p.pref.translated && modifying &&
p.has_immutable_field {
f := p.first_immutable_field
p.error_with_token_index('cannot modify immutable field `$f.name` (type `$f.parent_fn`)\n' +
'declare the field with `mut:`
struct $f.parent_fn {
mut:
$f.name $f.typ
}
', fname_tidx)
}
// Don't allow `arr.data`
if field.access_mod == .private && !p.builtin_mod && !p.pref.translated && p.mod != typ.mod && !p.is_vgen {
// println('$typ.name :: $field.name ')
// println(field.access_mod)
p.error_with_token_index('cannot refer to unexported field `$struct_field` (type `$typ.name`)\n' +
'declare the field with `pub:`
struct $typ.name {
pub:
$struct_field $field.typ
}
', fname_tidx)
}
p.gen(dot + struct_field)
p.next()
return field.typ
}
// method
mut method := p.table.find_method(typ, field_name) or {
p.error_with_token_index('could not find method `$field_name`', fname_tidx) // should never happen
exit(1)
}
p.fn_call(mut method, method_ph, '', str_typ)
// optional method call `a.method() or {}`, no return assignment
is_or_else := p.tok == .key_orelse
if p.tok == .question {
// `files := os.ls('.')?`
return p.gen_handle_question_suffix(method, method_ph)
}
else if !p.is_var_decl && is_or_else {
method.typ = p.gen_handle_option_or_else(method.typ, '', method_ph)
}
else if !p.is_var_decl && !is_or_else && !p.inside_return_expr &&
method.typ.starts_with('Option_') {
opt_type := method.typ[7..]
p.error('unhandled option type: `?$opt_type`')
}
// Methods returning `array` should return `array_string` etc
if method.typ == 'array' && typ.name.starts_with('array_') {
return typ.name
}
// Array methods returning `voidptr` (like `last()`) should return element type
if method.typ == 'void*' && typ.name.starts_with('array_') {
return typ.name[6..]
}
//if false && p.tok == .lsbr {
// if is_indexer {
//return p.index_expr(method.typ, method_ph)
//}
if method.typ.ends_with('*') {
p.is_alloc = true
}
return method.typ
}
enum IndexType {
noindex
str
map
array
array0
fixed_array
ptr
}
fn get_index_type(typ string) IndexType {
if typ.starts_with('map_') { return .map }
if typ == 'string' { return .str }
if typ.starts_with('array_') || typ == 'array' { return .array }
if typ == 'byte*' || typ == 'byteptr' || typ.contains('*') {
return .ptr
}
if typ[0] == `[` { return .fixed_array }
return .noindex
}
fn (p mut Parser) index_expr(typ_ string, fn_ph int) string {
mut typ := typ_
// a[0]
v := p.expr_var
//if p.fileis('fn_test.v') {
//println('index expr typ=$typ')
//println(v.name)
//}
is_variadic_arg := typ.starts_with('varg_')
is_map := typ.starts_with('map_')
is_str := typ == 'string'
is_arr0 := typ.starts_with('array_')
is_arr := is_arr0 || typ == 'array'
is_ptr := typ == 'byte*' || typ == 'byteptr' || typ.contains('*')
mut is_slice := false
is_indexer := p.tok == .lsbr
mut close_bracket := false
index_error_tok_pos := p.token_idx
if is_indexer {
is_fixed_arr := typ[0] == `[`
if !is_str && !is_arr && !is_map && !is_ptr && !is_fixed_arr && !is_variadic_arg {
p.error('invalid operation: type `$typ` does not support indexing')
}
p.check(.lsbr)
// Get element type (set `typ` to it)
if is_str {
typ = 'byte'
// Direct faster access to .str[i] in builtin modules
if p.builtin_mod || p.pref.is_bare {
p.gen('.str[')
close_bracket = true
}
else {
// Bounds check everywhere else
p.gen(', ')
}
}
if is_variadic_arg { typ = typ[5..] }
if is_fixed_arr {
// `[10]int` => `int`, `[10][3]int` => `[3]int`
if typ.contains('][') {
pos := typ.index_after('[', 1)
typ = typ[pos..]
}
else {
typ = typ.all_after(']')
}
p.gen('[')
close_bracket = true
}
else if is_ptr && !is_variadic_arg {
// typ = 'byte'
typ = typ.replace('*', '')
// modify(mut []string) fix
if !is_arr && !is_map {
p.gen('[/*ptr!*/')
close_bracket = true
}
}
if is_arr {
if is_arr0 {
typ = typ[6..]
}
p.gen_array_at(typ, is_arr0, fn_ph)
}
// map is tricky
// need to replace "m[key] = val" with "tmp = val; map_set(&m, key, &tmp)"
// need to replace "m[key]" with "tmp = val; map_get(&m, key, &tmp)"
// can only do that later once we know whether there's an "=" or not
if is_map {
typ = typ.replace('map_', '')
if typ == 'map' {
typ = 'void*'
}
p.gen(',')
}
// expression inside [ ]
if is_arr || is_str {
// [2..
if p.tok != .dotdot {
index_pos := p.cgen.cur_line.len
T := p.table.find_type(p.expression())
// Allows only i8-64 and byte-64 to be used when accessing an array
if T.parent != 'int' && T.parent != 'u32' {
p.check_types(T.name, 'int')
}
if p.cgen.cur_line[index_pos..].replace(' ', '').int() < 0 {
p.error('cannot access negative array index')
}
}
// [..
else {
p.gen('0')
}
if p.tok == .dotdot {
if is_arr {
typ = 'array_' + typ
} else if is_str {
typ = 'string'
} else {
p.error('slicing is supported by arrays and strings only')
}
is_slice = true
p.next()
p.gen(',')
// ..4]
if p.tok != .rsbr {
p.check_types(p.expression(), 'int')
p.gen(', false')
}
// ..]
else {
p.gen('-1, true')
}
}
}
else {
T := p.table.find_type(p.expression())
// TODO: Get the key type of the map instead of only string.
if is_map && T.parent != 'string' {
p.check_types(T.name, 'string')
}
}
p.check(.rsbr)
// if (is_str && p.builtin_mod) || is_ptr || is_fixed_arr && ! (is_ptr && is_arr) {
if close_bracket {
p.gen(']/*r$typ $v.is_mut*/')
}
p.expr_var = v
}
// accessing variadiac args
if is_variadic_arg {
// TODO: why was this here?
// if p.calling_c {
// p.error('you cannot currently pass varg to a C function.')
// }
if is_indexer {
l := p.cgen.cur_line.trim_space()
idx := l.last_index(' ') or {
panic('idx')
}
index_val := l[idx..].trim_space()
p.cgen.resetln(l[..fn_ph])
p.table.varg_access << VargAccess{
fn_name: p.cur_fn.name,
tok_idx: index_error_tok_pos,
index: index_val.int()
}
p.cgen.set_placeholder(fn_ph, '${v.name}->args[$index_val]')
return typ
}
}
// `m[key] = val`
// TODO move this from index_expr()
if (p.tok == .assign && !p.is_sql) || p.tok.is_assign() {
if is_indexer && is_str && !p.builtin_mod {
p.error('strings are immutable')
}
p.assigned_type = typ
p.expected_type = typ
assign_pos := p.cgen.cur_line.len
is_cao := p.tok != .assign
p.assign_statement(v, fn_ph, is_indexer && (is_map || is_arr))
// `m[key] = val`
if is_indexer && (is_map || is_arr) {
p.gen_array_set(typ, is_ptr, is_map, fn_ph, assign_pos, is_cao)
}
return typ
}
// else if p.pref.is_verbose && p.assigned_var != '' {
// p.error('didnt assign')
// }
// `m[key]`. no =, just a getter
else if (is_map || is_arr || (is_str && !p.builtin_mod)) && is_indexer {
p.index_get(typ, fn_ph, IndexConfig{
is_arr: is_arr
is_map: is_map
is_ptr: is_ptr
is_str: is_str
is_slice: is_slice
})
}
// else if is_arr && is_indexer{}
return typ
}
struct IndexConfig {
is_map bool
is_str bool
is_ptr bool
is_arr bool
is_arr0 bool
is_slice bool
}
// for debugging only
fn (p &Parser) fileis(s string) bool {
return os.filename(p.scanner.file_path).contains(s)
}
// in and dot have higher priority than `!`
fn (p mut Parser) indot_expr() string {
ph := p.cgen.add_placeholder()
mut typ := p.term()
if p.tok == .dot {
for p.tok == .dot {
typ = p.dot(typ, ph)
}
}
// `a in [1, 2, 3]`
// `key in map`
if p.tok == .key_in {
p.fspace()
p.check(.key_in)
p.expected_type = typ // this allows short enum syntax `foo in [.val1, .val2, .val3]`
if p.tok == .lsbr {
// a in [1,2,3] optimization => `a == 1 || a == 2 || a == 3`
// avoids an allocation
p.in_optimization(typ, ph)
return 'bool'
}
p.fspace()
p.gen('), ')
arr_typ := p.expression()
is_map := arr_typ.starts_with('map_')
is_arr:= arr_typ.starts_with('array_')
if !is_arr && !is_map {
p.error('`in` requires an array/map')
}
if is_arr && arr_typ[6..] != typ {
p.error('bad element type: `$typ` in `$arr_typ`')
}
if is_map && typ != 'string' {
p.error('bad element type: expecting `string`')
}
T := p.table.find_type(arr_typ)
if !is_map && !T.has_method('contains') {
p.error('$arr_typ has no method `contains`')
}
// `typ` is element's type
if is_map {
p.cgen.set_placeholder(ph, '(_IN_MAP( (')
}
else {
p.cgen.set_placeholder(ph, '(_IN($typ, (')
}
p.gen('))')
return 'bool'
}
return typ
}
// { user | name: 'new name' }
fn (p mut Parser) assoc() string {
// println('assoc()')
p.next()
name := p.check_name()
var := p.find_var_or_const(name) or {
p.error('unknown variable `$name`')
exit(1)
}
if !var.is_const {
p.mark_var_used(var)
}
p.check(.pipe)
p.gen('($var.typ){')
typ := p.table.find_type(var.typ)
mut fields := []string// track the fields user is setting, the rest will be copied from the old object
for p.tok != .rcbr {
field := p.check_name()
//if !typ.has_field(field) {
f := typ.find_field(field) or {
p.error('`$typ.name` has no field `$field`')
exit(1)
}
fields << field
p.gen('.$field = ')
p.check(.colon)
p.check_types(p.bool_expression(), f.typ)
p.gen(',')
if p.tok != .rcbr {
p.check(.comma)
}
p.fgen_nl()
}
// Copy the rest of the fields
for ffield in typ.fields {
f := ffield.name
if f in fields {
continue
}
p.gen('.$f = ${var.name}.$f,')
}
p.check(.rcbr)
p.gen('}')
return var.typ
}
fn (p mut Parser) char_expr() {
p.gen('\'$p.lit\'')
p.next()
}
fn format_str(_str string) string {
// TODO don't call replace 3 times for every string, do this in scanner.v
mut str := _str.replace('"', '\\"')
str = str.replace('\r\n', '\\n')
str = str.replace('\n', '\\n')
return str
}
// m := map[string]int{}
// m := { 'one': 1 }
fn (p mut Parser) map_init() string {
// m := { 'one': 1, 'two': 2 }
mut keys_gen := '' // (string[]){tos2("one"), tos2("two")}
mut vals_gen := '' // (int[]){1, 2}
mut val_type := '' // 'int'
if p.tok == .lcbr {
p.check(.lcbr)
mut i := 0
for {
key := p.lit
keys_gen += 'tos3("$key"), '
p.check(.str)
p.check(.colon)
p.fspace()
t, val_expr := p.tmp_expr()
if i == 0 {
val_type = t
}
i++
if val_type != t {
if !p.check_types_no_throw(val_type, t) {
p.error('bad map element type `$val_type` instead of `$t`')
}
}
vals_gen += '$val_expr, '
if p.tok == .rcbr {
p.fgen_nl()
p.check(.rcbr)
break
}
if p.tok == .comma {
p.check(.comma)
}
p.fgen_nl()
}
p.gen('new_map_init($i, sizeof($val_type), ' +
'(string[$i]){ $keys_gen }, ($val_type [$i]){ $vals_gen } )')
typ := 'map_$val_type'
p.register_map(typ)
return typ
}
p.next()
p.check(.lsbr)
key_type := p.check_name()
if key_type != 'string' {
p.error('only string key maps allowed for now')
}
p.check(.rsbr)
val_type = p.get_type()/// p.check_name()
//if !p.table.known_type(val_type) {
//p.error('map init unknown type "$val_type"')
//}
typ := 'map_$val_type'
p.register_map(typ)
p.gen('new_map(1, sizeof($val_type))')
if p.tok == .lcbr {
p.check(.lcbr)
p.check(.rcbr)
println('warning: $p.file_name:$p.scanner.line_nr ' +
'initializaing maps no longer requires `{}`')
}
return typ
}
// `nums := [1, 2, 3]`
fn (p mut Parser) array_init() string {
expected_array_type := p.expected_type
//if p.fileis('interface_') {
//println('a exp='+p.expected_type)
//}
p.is_alloc = true
p.check(.lsbr)
mut is_integer := p.tok == .number // for `[10]int`
// fixed length arrays with a const len: `nums := [N]int`, same as `[10]int` basically
mut is_const_len := false
if p.tok == .name && !p.inside_const {
const_name := p.prepend_mod(p.lit)
if p.table.known_const(const_name) {
c := p.table.find_const(const_name) or {
//p.error('unknown const `$p.lit`')
exit(1)
}
if c.typ == 'int' && p.peek() == .rsbr { //&& !p.inside_const {
is_integer = true
is_const_len = true
} else {
p.error('bad fixed size array const `$p.lit`')
}
}
}
lit := p.lit
mut typ := ''
new_arr_ph := p.cgen.add_placeholder()
mut i := 0
for p.tok != .rsbr {
val_typ := p.bool_expression()
// Get the type of the first expression
if i == 0 {
typ = val_typ
// fixed width array initialization? (`arr := [20]byte`)
if is_integer && p.tok == .rsbr && p.peek() == .name &&
p.cur_tok().line_nr == p.peek_token().line_nr {
// there is no space between `[10]` and `byte`
// if p.cur_tok().col + p.peek_token().lit.len == p.peek_token().col {
if p.cur_tok().pos + p.peek_token().lit.len == p.peek_token().pos {
p.check(.rsbr)
array_elem_typ := p.get_type()
if !p.table.known_type(array_elem_typ) {
p.error('bad type `$array_elem_typ`')
}
p.cgen.resetln('')
//p.gen('{0}')
p.is_alloc = false
if is_const_len {
return '[${mod_gen_name(p.mod)}__$lit]$array_elem_typ'
}
return '[$lit]$array_elem_typ'
} else {
p.check(.rsbr)
typ = p.get_type()
p.error('no space allowed between [$lit] and $typ')
}
}
}
if val_typ != typ {
if !p.check_types_no_throw(val_typ, typ) {
mut ok := false
// `foo([cat, dog])` where foo is `fn foo([]Animal) {`
// `expected_type` is `[]Animaler`
if expected_array_type.ends_with('er') {
if p.satisfies_interface(expected_array_type, typ, false) {
ok = true
}
}
if !ok {
p.error('bad array element type `$val_typ` instead of `$typ`')
}
}
}
if p.tok != .rsbr && p.tok != .semicolon {
p.gen(', ')
p.check(.comma)
p.fspace()
}
i++
// Repeat (a = [0;5] )
if i == 1 && p.tok == .semicolon {
p.error('`[0 ; len]` syntax was removed. Use `[0].repeat(len)` instead')
}
}
p.check(.rsbr)
// type after `]`? (e.g. "[]string")
exp_array := p.expected_type.starts_with('array_')
if p.tok != .name && p.tok != .lsbr && i == 0 && !exp_array {
p.error('specify array type: `[]typ` instead of `[]`')
}
if p.tok == .name && i == 0 &&
p.tokens[p.token_idx-2].line_nr == p.tokens[p.token_idx-1].line_nr { // TODO
// vals.len == 0 {
if exp_array {
p.error('no need to specify the full array type here, use `[]` instead of `[]${p.expected_type[6..]}`')
}
typ = p.get_type()
} else if exp_array && i == 0 {
// allow `known_array = []`
typ = p.expected_type[6..]
}
// ! after array => no malloc and no copy
no_alloc := p.tok == .not
if no_alloc {
p.next()
}
// [1,2,3]!! => [3]int{1,2,3}
is_fixed_size := p.tok == .not
if is_fixed_size {
p.next()
p.gen(' }')
if !p.first_pass() {
// If we are defining a const array, we don't need to specify the type:
// `a = {1,2,3}`, not `a = (int[]) {1,2,3}`
if p.inside_const {
p.cgen.set_placeholder(new_arr_ph, '{')
}
else {
p.cgen.set_placeholder(new_arr_ph, '($typ[]) {')
}
}
return '[$i]$typ'
}
// if ptr {
// typ += '_ptr"
// }
p.gen_array_init(typ, no_alloc, new_arr_ph, i)
typ = 'array_$typ'
p.register_array(typ)
return typ
}
// `f32(3)`
// tok is `f32` or `)` if `(*int)(ptr)`
fn (p mut Parser) get_tmp() string {
p.tmp_cnt++
return 'tmp$p.tmp_cnt'
}
fn (p mut Parser) get_tmp_counter() int {
p.tmp_cnt++
return p.tmp_cnt
}
fn (p mut Parser) assert_statement() {
if p.first_pass() {
return
}
p.check(.key_assert)
p.fspace()
tmp := p.get_tmp()
p.gen('bool $tmp = ')
p.check_types(p.bool_expression(), 'bool')
nline := p.scanner.line_nr
// TODO print "expected: got" for failed tests
filename := cescaped_path(p.file_path)
cfname:=p.cur_fn.name.replace('main__', '')
sourceline := p.scanner.line( nline - 1 ).replace('"', '\'')
if !p.pref.is_test {
// an assert used in a normal v program. no fancy formatting
p.genln(';\n
/// sline: "$sourceline"
if (!$tmp) {
g_test_fails++;
eprintln(tos3("${filename}:${p.scanner.line_nr}: FAILED: ${cfname}()"));
eprintln(tos3("Source: $sourceline"));
v_panic(tos3("An assertion failed."));
exit(1);
} else {
g_test_oks++;
}
')
return
}
p.genln(';\n
if (!$tmp) {
g_test_fails++;
main__cb_assertion_failed(
tos3("$filename"),
$p.scanner.line_nr,
tos3("$sourceline"),
tos3("${p.cur_fn.name}()")
);
exit(1);
// TODO
// Maybe print all vars in a test function if it fails?
} else {
g_test_oks++;
main__cb_assertion_ok(
tos3("$filename"),
$p.scanner.line_nr,
tos3("$sourceline"),
tos3("${p.cur_fn.name}()")
);
}
')
}
fn (p mut Parser) return_st() {
p.check(.key_return)
p.fspace()
deferred_text := p.get_deferred_text()
fn_returns := p.cur_fn.typ != 'void'
if fn_returns {
if p.tok == .rcbr {
p.error('`$p.cur_fn.name` needs to return `$p.cur_fn.typ`')
}
ph := p.cgen.add_placeholder()
p.inside_return_expr = true
is_none := p.tok == .key_none
p.expected_type = p.cur_fn.typ
mut expr_type := p.bool_expression()
// println('$p.cur_fn.name returns type $expr_type, should be $p.cur_fn.typ')
mut types := []string
mut mr_values := [p.cgen.cur_line[ph..].trim_space()]
types << expr_type
for p.tok == .comma {
p.check(.comma)
typ, expr := p.tmp_expr()
types << typ
mr_values << expr.trim_space()
}
mut cur_fn_typ_chk := p.cur_fn.typ
// multiple returns
if types.len > 1 {
expr_type = types.join(',')
cur_fn_typ_chk = cur_fn_typ_chk.replace('_V_MulRet_', '').replace('_PTR_', '*').replace('_V_', ',')
mut ret_fields := ''
for ret_val_idx, ret_val in mr_values {
if ret_val_idx > 0 {
ret_fields += ','
}
ret_fields += '.var_$ret_val_idx=${ret_val}'
}
p.cgen.resetln('($p.cur_fn.typ){$ret_fields}')
}
p.inside_return_expr = false
// Automatically wrap an object inside an option if the function
// returns an option:
// `return val` => `return opt_ok(val)`
if p.cur_fn.typ.ends_with(expr_type) && !is_none &&
p.cur_fn.typ.starts_with('Option_') {
tmp := p.get_tmp()
ret := p.cgen.cur_line[ph..]
typ := expr_type.replace('Option_', '')
p.cgen.resetln('$expr_type $tmp = OPTION_CAST($expr_type)($ret);')
p.genln(deferred_text)
p.gen('return opt_ok(&$tmp, sizeof($typ))')
}
else {
ret := p.cgen.cur_line[ph..]
if deferred_text == '' || expr_type == 'void*' {
// no defer{} necessary?
if expr_type == '${p.cur_fn.typ}*' {
p.cgen.resetln('return *$ret')
} else {
p.cgen.resetln('return $ret')
}
} else {
tmp := p.get_tmp()
p.cgen.resetln('$expr_type $tmp = $ret;\n')
p.genln(deferred_text)
p.genln('return $tmp;')
}
}
p.check_types(expr_type, cur_fn_typ_chk)
}
else {
// Don't allow `return val` in functions that don't return anything
if p.tok == .name || p.tok == .number || p.tok == .str {
p.error_with_token_index('function `$p.cur_fn.name` should not return a value', p.cur_fn.fn_name_token_idx)
}
p.genln(deferred_text)
if p.cur_fn.name == 'main' {
p.gen('return 0')
}
else {
p.gen('return')
}
}
//p.fgenln('//ret')
p.returns = true
}
fn (p &Parser) get_deferred_text() string {
// @emily33901: Scoped defer
// Check all of our defer texts to see if there is one at a higher scope level
// The one for our current scope would be the last so any before that need to be
// added.
mut deferred_text := ''
for text in p.cur_fn.defer_text {
if text != '' {
// In reverse order
deferred_text = text + deferred_text
}
}
return deferred_text
}
fn prepend_mod(mod, name string) string {
return '${mod}__${name}'
}
fn (p &Parser) prepend_mod(name string) string {
return prepend_mod(mod_gen_name(p.mod), name)
}
fn (p mut Parser) go_statement() {
p.check(.key_go)
p.fspace()
mut gotoken_idx := p.cur_tok_index()
// TODO copypasta of name_expr() ?
if p.peek() == .dot {
// Method
var_name := p.lit
v := p.find_var(var_name) or {
return
}
p.mark_var_used(v)
gotoken_idx = p.cur_tok_index()
p.next()
p.check(.dot)
typ := p.table.find_type(v.typ)
method := p.table.find_method(typ, p.lit) or {
p.error_with_token_index('go method missing $var_name', gotoken_idx)
return
}
p.async_fn_call(method, 0, var_name, v.typ)
}
else {
f_name := p.lit
// Normal function
f := p.table.find_fn(p.prepend_mod(f_name)) or {
println( p.table.debug_fns() )
p.error_with_token_index('can not find function $f_name', gotoken_idx)
return
}
if f.name == 'println' || f.name == 'print' {
p.error_with_token_index('`go` cannot be used with `println`', gotoken_idx)
}
p.async_fn_call(f, 0, '', '')
}
}
/*
fn (p mut Parser) register_var(v Var) {
if v.line_nr == 0 {
spos := p.scanner.get_scanner_pos()
p.register_var({ v | scanner_pos: spos, line_nr: spos.line_nr })
} else {
p.register_var(v)
}
}
*/
// user:=jsdecode(User, user_json_string)
fn (p mut Parser) js_decode() string {
p.check(.name)// json
p.check(.dot)
op := p.check_name()
op_token_idx := p.cur_tok_index()
if op == 'decode' {
// User tmp2; tmp2.foo = 0; tmp2.bar = 0;// I forgot to zero vals before => huge bug
// Option_User tmp3 = jsdecode_User(json_parse( s), &tmp2); ;
// if (!tmp3 .ok) {
// return
// }
// User u = *(User*) tmp3 . data; // TODO remove this (generated in or {} block handler)
p.check(.lpar)
typ := p.get_type()
p.check(.comma)
styp, expr := p.tmp_expr()
p.check_types(styp, 'string')
p.check(.rpar)
tmp := p.get_tmp()
cjson_tmp := p.get_tmp()
mut decl := '$typ $tmp; '
// Init the struct
T := p.table.find_type(typ)
for field in T.fields {
def_val := type_default(field.typ)
if def_val != '' {
decl += '${tmp}.$field.name = OPTION_CAST($field.typ) $def_val;\n'
}
}
p.gen_json_for_type(T)
decl += 'cJSON* $cjson_tmp = json__json_parse($expr);'
p.cgen.insert_before(decl)
// p.gen('jsdecode_$typ(json_parse($expr), &$tmp);')
p.gen('json__jsdecode_${typ}($cjson_tmp, &$tmp); cJSON_Delete($cjson_tmp);')
opt_type := 'Option_$typ'
p.cgen.typedefs << 'typedef Option $opt_type;'
p.table.register_builtin(opt_type)
return opt_type
}
else if op == 'encode' {
p.check(.lpar)
typ, expr := p.tmp_expr()
T := p.table.find_type(typ)
p.gen_json_for_type(T)
p.check(.rpar)
p.gen('json__json_print(json__jsencode_${typ}($expr))')
return 'string'
}
else {
p.error_with_token_index('bad json op "$op"', op_token_idx)
}
return ''
}
fn (p mut Parser) attribute() {
p.check(.lsbr)
if p.tok == .key_if {
// [if vfmt]
p.next()
p.attr = 'if ' + p.check_name()
} else {
p.attr = p.check_name()
}
attr_token_idx := p.cur_tok_index()
if p.tok == .colon {
p.check(.colon)
p.attr = p.attr + ':' + p.check_name()
}
p.check(.rsbr)
p.fgen_nl()
if p.tok == .key_fn || (p.tok == .key_pub && p.peek() == .key_fn) {
p.fn_decl()
p.attr = ''
return
}
else if p.tok == .key_struct {
p.struct_decl()
p.attr = ''
return
}
else if p.tok == .key_enum {
p.enum_decl(false)
p.attr = ''
return
}
p.error_with_token_index('bad attribute usage', attr_token_idx)
}
fn (p mut Parser) defer_st() {
p.check(.key_defer)
p.check(.lcbr)
pos := p.cgen.lines.len
// Save everything inside the defer block to `defer_text`.
// It will be inserted before every `return`
// Emily: TODO: all variables that are used in this defer statement need to be evaluated when the block
// is defined otherwise they could change over the course of the function
// (make temps out of them)
p.genln('{')
p.statements()
p.cur_fn.defer_text.last() = p.cgen.lines[pos..].join('\n') + p.cur_fn.defer_text.last()
// Rollback p.cgen.lines
p.cgen.lines = p.cgen.lines[..pos]
p.cgen.resetln('')
}
fn (p mut Parser) check_and_register_used_imported_type(typ_name string) {
us_idx := typ_name.index('__') or { return }
arg_mod := typ_name[..us_idx]
if p.import_table.known_alias(arg_mod) {
p.import_table.register_used_import(arg_mod)
}
}
fn (p mut Parser) check_unused_imports() {
// Don't run in the generated V file with `.str()`
if p.is_vgen {
return
}
mut output := ''
for alias, mod in p.import_table.imports {
if !p.import_table.is_used_import(alias) {
mod_alias := if alias == mod { alias } else { '$alias ($mod)' }
output += '\n * $mod_alias'
}
}
if output == '' { return }
// the imports are usually at the start of the file
p.production_error_with_token_index( 'the following imports were never used: $output', 0 )
}
fn (p &Parser) is_expr_fn_call(start_tok_idx int) (bool, string) {
mut expr := p.tokens[start_tok_idx-1].str()
mut is_fn_call := p.tokens[start_tok_idx].tok == .lpar
if !is_fn_call {
mut i := start_tok_idx
for (p.tokens[i].tok == .dot || p.tokens[i].tok == .name) &&
p.tokens[i].lit != '_' && i < p.tokens.len {
expr += p.tokens[i].str()
i++
}
is_fn_call = p.tokens[i].tok == .lpar
}
return is_fn_call, expr
}
fn todo_remove() {
x64.new_gen('f')
}
Reference in New Issue View Git Blame Copy Permalink