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Revert "parser: cache tokens (first step)" 

This reverts commit 8992707fbb.
pull/2108/head
Alexander Medvednikov 2019-09-26 06:05:18 +03:00
parent 8992707fbb
commit 0fcdd7db35
5 changed files with 34 additions and 88 deletions
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4
compiler/comptime.v
View File

@ -20,7 +20,7 @@ fn (p mut Parser) comp_time() {
}
name := p.check_name()
p.fspace()
if name in supported_platforms {
if name in SupportedPlatforms {
ifdef_name := os_name_to_ifdef(name)
if not {
p.genln('#ifndef $ifdef_name')
@ -42,7 +42,7 @@ fn (p mut Parser) comp_time() {
}
else {
println('Supported platforms:')
println(supported_platforms)
println(SupportedPlatforms)
p.error('unknown platform `$name`')
}
if_returns := p.returns

2
compiler/main.v
View File

@ -27,7 +27,7 @@ enum BuildMode {
}
const (
supported_platforms = ['windows', 'mac', 'linux', 'freebsd', 'openbsd',
SupportedPlatforms = ['windows', 'mac', 'linux', 'freebsd', 'openbsd',
'netbsd', 'dragonfly', 'msvc', 'android', 'js']
ModPath = os.home_dir() + '/.vmodules/'
)

94
compiler/parser.v
View File

@ -9,15 +9,6 @@ import (
strings
)
// TODO rename to Token
// TODO rename enum Token to TokenType
struct Tok {
tok Token
lit string
line_nr int
// col int
}
struct Parser {
file_path string // "/home/user/hello.v"
file_name string // "hello.v"
@ -30,7 +21,7 @@ struct Parser {
pref &Preferences // Preferences shared from V struct
mut:
scanner &Scanner
tokens []Tok
// tokens []Token // TODO cache all tokens, right now they have to be scanned twice
token_idx int
tok Token
prev_tok Token
@ -133,20 +124,8 @@ fn (v mut V) new_parser(path string) Parser {
v.cgen.line_directives = v.pref.is_debuggable
v.cgen.file = path
for {
res := p.scanner.scan()
p.tokens << Tok {
tok: res.tok
lit: res.lit
line_nr: p.scanner.line_nr
}
if res.tok == .eof {
break
}
}
//p.next()
//p.scanner.debug_tokens()
p.next()
// p.scanner.debug_tokens()
return p
}
@ -157,52 +136,6 @@ fn (p mut Parser) set_current_fn(f Fn) {
}
fn (p mut Parser) next() {
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 = Token.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
}
fn (p & Parser) peek() Token {
if p.token_idx >= p.tokens.len - 2 {
return Token.eof
}
tok := p.tokens[p.token_idx]
return tok.tok
/*
// save scanner state
pos := s.pos
line := s.line_nr
inside_string := s.inside_string
inter_start := s.inter_start
inter_end := s.inter_end
res := s.scan()
tok := res.tok
// restore scanner state
s.pos = pos
s.line_nr = line
s.inside_string = inside_string
s.inter_start = inter_start
s.inter_end = inter_end
return tok
*/
}
fn (p mut Parser) next_old() {
p.prev_tok2 = p.prev_tok
p.prev_tok = p.tok
p.scanner.prev_tok = p.tok
@ -222,8 +155,6 @@ fn (p &Parser) log(s string) {
fn (p mut Parser) parse(pass Pass) {
p.pass = pass
p.token_idx = 0
p.next()
//p.log('\nparse() run=$p.pass file=$p.file_name tok=${p.strtok()}')// , "script_file=", script_file)
// `module main` is not required if it's a single file program
if p.is_script || p.pref.is_test {
@ -1648,16 +1579,14 @@ fn (p mut Parser) name_expr() string {
}
// //////////////////////////
// module ?
if p.peek() == .dot && ((name == p.mod && p.table.known_mod(name)) ||
p.import_table.known_alias(name)) && !is_c &&
!p.known_var(name) // Allow shadowing (`gg = gg.newcontext(); gg.foo()`)
{
// (Allow shadowing `gg = gg.newcontext(); gg.draw_triangle();` )
if p.peek() == .dot && ((name == p.mod && p.table.known_mod(name)) || p.import_table.known_alias(name))
&& !p.known_var(name) && !is_c {
mut mod := name
// must be aliased module
if name != p.mod && p.import_table.known_alias(name) {
p.import_table.register_used_import(name)
// we replaced "." with "_dot_" in p.mod for C variable names,
// do same here.
// we replaced "." with "_dot_" in p.mod for C variable names, do same here.
mod = p.import_table.resolve_alias(name).replace('.', '_dot_')
}
p.next()
@ -1667,8 +1596,7 @@ fn (p mut Parser) name_expr() string {
name = prepend_mod(mod, name)
}
else if !p.table.known_type(name) && !p.known_var(name) &&
!p.table.known_fn(name) && !p.table.known_const(name) && !is_c
{
!p.table.known_fn(name) && !p.table.known_const(name) && !is_c {
name = p.prepend_mod(name)
}
// Variable
@ -2872,10 +2800,10 @@ fn (p mut Parser) array_init() string {
typ = val_typ
// fixed width array initialization? (`arr := [20]byte`)
if is_integer && p.tok == .rsbr && p.peek() == .name {
//nextc := p.scanner.text[p.scanner.pos + 1]
nextc := p.scanner.text[p.scanner.pos + 1]
// TODO whitespace hack
// Make sure there's no space in `[10]byte`
//if !nextc.is_space() {
if !nextc.is_space() {
p.check(.rsbr)
array_elem_typ := p.get_type()
if !p.table.known_type(array_elem_typ) {
@ -2888,7 +2816,7 @@ fn (p mut Parser) array_init() string {
return '[${p.mod}__$lit]$array_elem_typ'
}
return '[$lit]$array_elem_typ'
//}
}
}
}
if val_typ != typ {

20
compiler/scanner.v
View File

@ -785,6 +785,26 @@ fn (s mut Scanner) ident_char() string {
return if c == '\'' { '\\' + c } else { c }
}
fn (s mut Scanner) peek() Token {
// save scanner state
pos := s.pos
line := s.line_nr
inside_string := s.inside_string
inter_start := s.inter_start
inter_end := s.inter_end
res := s.scan()
tok := res.tok
// restore scanner state
s.pos = pos
s.line_nr = line
s.inside_string = inside_string
s.inter_start = inter_start
s.inter_end = inter_end
return tok
}
fn (s &Scanner) expect(want string, start_pos int) bool {
end_pos := start_pos + want.len
if start_pos < 0 || start_pos >= s.text.len {

2
compiler/vfmt.v
View File

@ -37,7 +37,6 @@ fn (p mut Parser) fgenln(s string) {
p.scanner.fgenln(s)
}
/*
fn (p mut Parser) peek() Token {
for {
p.cgen.line = p.scanner.line_nr + 1
@ -48,7 +47,6 @@ fn (p mut Parser) peek() Token {
}
return .eof // TODO can never get here - v doesn't know that
}
*/
fn (p mut Parser) fmt_inc() {
p.scanner.fmt_indent++