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a[start..end] slicing

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This commit is contained in:
Alexander Medvednikov
2019-10-26 21:58:26 +03:00
parent 678ce54e70
commit 570a7aaaf3
3 changed files with 33 additions and 11 deletions
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18
vlib/compiler/gen_c.v
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@@ -169,7 +169,7 @@ fn types_to_c(types []Type, table &Table) string {
return sb.str()
}
fn (p mut Parser) index_get(typ string, fn_ph int, cfg IndexCfg) {
fn (p mut Parser) index_get(typ string, fn_ph int, cfg IndexConfig) {
// Erase var name we generated earlier: "int a = m, 0"
// "m, 0" gets killed since we need to start from scratch. It's messy.
// "m, 0" is an index expression, save it before deleting and insert later in map_get()
@@ -195,15 +195,21 @@ fn (p mut Parser) index_get(typ string, fn_ph int, cfg IndexCfg) {
p.gen('$index_expr ]')
}
else {
if cfg.is_ptr {
p.gen('( *($typ*) array_get(* $index_expr) )')
} else {
p.gen('( *($typ*) array_get($index_expr) )')
amp := if cfg.is_ptr { '&' } else { '' }
if cfg.is_slice {
p.gen(' array_slice($amp $index_expr) ')
}
else {
p.gen('( *($typ*) array_get($amp $index_expr) )')
}
}
}
else if cfg.is_str && !p.builtin_mod {
p.gen('string_at($index_expr)')
if cfg.is_slice {
p.gen('string_substr($index_expr)')
} else {
p.gen('string_at($index_expr)')
}
}
// Zero the string after map_get() if it's nil, numbers are automatically 0
// This is ugly, but what can I do without generics?