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compiler: add [..2] & [2..] support for slices

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joe-conigliaro
2019-10-27 17:36:04 +11:00
committed by Alexander Medvednikov
parent e80cf185b9
commit a075ce160e
6 changed files with 47 additions and 10 deletions
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31
vlib/compiler/parser.v
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@ -2155,14 +2155,21 @@ fn (p mut Parser) index_expr(typ_ string, fn_ph int) string {
}
// expression inside [ ]
if is_arr || is_str {
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')
// [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.right(index_pos).replace(' ', '').int() < 0 {
p.error('cannot access negative array index')
}
}
if p.cgen.cur_line.right(index_pos).replace(' ', '').int() < 0 {
p.error('cannot access negative array index')
// [..
else {
p.gen('0')
}
if p.tok == .dotdot {
if is_arr {
@ -2175,7 +2182,15 @@ fn (p mut Parser) index_expr(typ_ string, fn_ph int) string {
is_slice = true
p.next()
p.gen(',')
p.check_types(p.expression(), 'int')
// ..4]
if p.tok != .rsbr {
p.check_types(p.expression(), 'int')
p.gen(', false')
}
// ..]
else {
p.gen('-1, true')
}
}
}
else {