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0bxxxx binary literal support; _ in literals (1_000_000)

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This commit is contained in:
penguindark
2020-01-23 03:28:25 +01:00
committed by Alexander Medvednikov
parent c3d0814517
commit da9b6394e8
5 changed files with 112 additions and 14 deletions
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54
vlib/compiler/scanner.v
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@ -109,6 +109,43 @@ fn (s mut Scanner) ident_name() string {
return name
}
const(
num_sep = `_` // char used as number separator
)
fn filter_num_sep(txt byteptr, start int, end int) string {
mut b := malloc(end-start + 1) // add a byte for the endstring 0
mut i := start
mut i1 := 0
for i < end {
if txt[i] != num_sep {
b[i1]=txt[i]
i1++
}
i++
}
b[i1]=0 // C string compatibility
return string{b,i1}
}
fn (s mut Scanner) ident_bin_number() string {
start_pos := s.pos
s.pos += 2 // skip '0b'
for {
if s.pos >= s.text.len {
break
}
c := s.text[s.pos]
if !c.is_bin_digit() && c != num_sep {
break
}
s.pos++
}
number := filter_num_sep(s.text.str, start_pos, s.pos)
s.pos--
return number
}
fn (s mut Scanner) ident_hex_number() string {
start_pos := s.pos
s.pos += 2 // skip '0x'
@ -117,12 +154,12 @@ fn (s mut Scanner) ident_hex_number() string {
break
}
c := s.text[s.pos]
if !c.is_hex_digit() {
if !c.is_hex_digit() && c != num_sep {
break
}
s.pos++
}
number := s.text[start_pos..s.pos]
number := filter_num_sep(s.text.str, start_pos, s.pos)
s.pos--
return number
}
@ -135,7 +172,7 @@ fn (s mut Scanner) ident_oct_number() string {
}
c := s.text[s.pos]
if c.is_digit() {
if !c.is_oct_digit() {
if !c.is_oct_digit() && c != num_sep {
s.error('malformed octal constant')
}
}
@ -144,7 +181,7 @@ fn (s mut Scanner) ident_oct_number() string {
}
s.pos++
}
number := s.text[start_pos..s.pos]
number := filter_num_sep(s.text.str, start_pos, s.pos)
s.pos--
return number
}
@ -152,13 +189,13 @@ fn (s mut Scanner) ident_oct_number() string {
fn (s mut Scanner) ident_dec_number() string {
start_pos := s.pos
// scan integer part
for s.pos < s.text.len && s.text[s.pos].is_digit() {
for s.pos < s.text.len && (s.text[s.pos].is_digit() || s.text[s.pos] == num_sep) {
s.pos++
}
// e.g. 1..9
// we just return '1' and don't scan '..9'
if s.expect('..', s.pos) {
number := s.text[start_pos..s.pos]
number := filter_num_sep(s.text.str, start_pos, s.pos)
s.pos--
return number
}
@ -193,12 +230,15 @@ fn (s mut Scanner) ident_dec_number() string {
s.error('too many decimal points in number')
}
}
number := s.text[start_pos..s.pos]
number := filter_num_sep(s.text.str, start_pos, s.pos)
s.pos--
return number
}
fn (s mut Scanner) ident_number() string {
if s.expect('0b', s.pos) {
return s.ident_bin_number()
}
if s.expect('0x', s.pos) {
return s.ident_hex_number()
}