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move array filter codegen to comptime.v

pull/2404/head
Alexander Medvednikov 2019-10-18 07:58:54 +03:00
parent d501dc4c11
commit c355e967ad
2 changed files with 41 additions and 37 deletions
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40
vlib/compiler/comptime.v
View File

@ -318,3 +318,43 @@ fn (p mut Parser) gen_struct_str(typ Type) {
// This function will get parsee by V after the main pass.
p.cgen.fns << 'string ${typ.name}_str();'
}
fn (p mut Parser) gen_array_filter(str_typ string, method_ph int) {
/*
// V
a := [1,2,3,4]
b := a.filter(it % 2 == 0)
// C
array_int a = ...;
array_int tmp2 = new_array(0, 4, 4);
for (int i = 0; i < a.len; i++) {
int it = ((int*)a.data)[i];
if (it % 2 == 0) array_push(&tmp2, &it);
}
array_int b = tmp2;
*/
val_type:=str_typ.right(6)
p.open_scope()
p.register_var(Var{
name: 'it'
typ: val_type
})
p.next()
p.check(.lpar)
p.cgen.resetln('')
tmp := p.get_tmp()
a := p.expr_var.name
p.cgen.set_placeholder(method_ph,'\n$str_typ $tmp = new_array(0, $a .len,sizeof($val_type));\n')
p.genln('for (int i = 0; i < ${a}.len; i++) {')
p.genln('$val_type it = (($val_type*)${a}.data)[i];')
p.gen('if (')
p.bool_expression()
p.genln(') array_push(&$tmp, &it);')
//p.genln(') array_push(&$tmp, &((($val_type*)${a}.data)[i]));')
//p.genln(') array_push(&$tmp, ${a}.data + i * ${a}.element_size);')
p.genln('}')
p.gen(tmp) // TODO why does this `gen()` work?
p.check(.rpar)
p.close_scope()
}

38
vlib/compiler/parser.v
View File

@ -2105,43 +2105,7 @@ fn (p mut Parser) dot(str_typ_ string, method_ph int) string {
}
field_name := p.lit
if field_name == 'filter' && str_typ.starts_with('array_') {
/*
// V
a := [1,2,3,4]
b := a.filter(it % 2 == 0)
// C
array_int a = ...;
array_int tmp2 = new_array(0, 4, 4);
for (int i = 0; i < a.len; i++) {
int it = ((int*)a.data)[i];
if (it % 2 == 0) array_push(&tmp2, &it);
}
array_int b = tmp2;
*/
val_type:=str_typ.right(6)
p.open_scope()
p.register_var(Var{
name: 'it'
typ: val_type
})
p.next()
p.check(.lpar)
p.cgen.resetln('')
tmp := p.get_tmp()
a := p.expr_var.name
p.cgen.set_placeholder(method_ph,'\n$str_typ $tmp = new_array(0, $a .len,sizeof($val_type));\n')
p.genln('for (int i = 0; i < ${a}.len; i++) {')
p.genln('$val_type it = (($val_type*)${a}.data)[i];')
p.gen('if (')
p.bool_expression()
p.genln(') array_push(&$tmp, &it);')
//p.genln(') array_push(&$tmp, &((($val_type*)${a}.data)[i]));')
//p.genln(') array_push(&$tmp, ${a}.data + i * ${a}.element_size);')
p.genln('}')
p.gen(tmp) // TODO why does this `gen()` work?
p.check(.rpar)
p.close_scope()
p.gen_array_filter(str_typ, method_ph)
return str_typ
}