func ForFactory(p *core.Parser, config *core.Configuration) (core.Tag, error) {
name := p.ReadName()
if len(name) == 0 {
return nil, p.Error("Invalid variable name in for tag")
}
if p.SkipSpaces() != 'i' || p.Left() < 3 || p.Data[p.Position+1] != 'n' || !core.IsTokenEnd(p.Data[p.Position+2]) {
return nil, p.Error("Expecting keyword 'in' after variable name in for tag")
}
p.ForwardBy(2)
value, err := p.ReadValue()
if err != nil {
return nil, err
}
f := &For{
Common: NewCommon(),
name: name,
keyName: name + "[0]",
valueName: name + "[1]",
value: value,
}
for {
name := p.ReadName()
if name == "" {
break
}
if name == "limit" {
if p.SkipUntil(':') != ':' {
return nil, p.Error("Expecting ':' after limit in for tag")
}
p.Forward()
limit, err := p.ReadValue()
if err != nil {
return nil, err
}
f.limit = limit
} else if name == "offset" {
if p.SkipUntil(':') != ':' {
return nil, p.Error("Expecting ':' after offset in for tag")
}
p.Forward()
offset, err := p.ReadValue()
if err != nil {
return nil, err
}
f.offset = offset
} else if name == "reverse" {
f.reverse = true
} else {
return nil, p.Error(fmt.Sprint("%q is an inknown modifier in for tag", name))
}
}
p.SkipPastTag()
return f, nil
}