42 lines
1.2 KiB
Rust
42 lines
1.2 KiB
Rust
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pub fn find_doc_hint(attrs: &[syn::Attribute]) -> Option<String> {
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attrs.iter().filter_map(doc_hint).next()
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}
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pub fn is_doc_hint(attr: &syn::Attribute) -> bool {
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is_attr_name_value(attr, "doc_hint")
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}
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pub fn doc_hint(attr: &syn::Attribute) -> Option<String> {
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get_name_value_str_lit(attr, "doc_hint")
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}
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pub fn find_config_value(attrs: &[syn::Attribute]) -> Option<String> {
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attrs.iter().filter_map(config_value).next()
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}
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pub fn config_value(attr: &syn::Attribute) -> Option<String> {
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get_name_value_str_lit(attr, "value")
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}
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pub fn is_config_value(attr: &syn::Attribute) -> bool {
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is_attr_name_value(attr, "value")
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}
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fn is_attr_name_value(attr: &syn::Attribute, name: &str) -> bool {
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attr.interpret_meta().map_or(false, |meta| match meta {
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syn::Meta::NameValue(syn::MetaNameValue { ref ident, .. }) if ident == name => true,
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_ => false,
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})
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}
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fn get_name_value_str_lit(attr: &syn::Attribute, name: &str) -> Option<String> {
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attr.interpret_meta().and_then(|meta| match meta {
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syn::Meta::NameValue(syn::MetaNameValue {
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ref ident,
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lit: syn::Lit::Str(ref lit_str),
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..
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}) if ident == name => Some(lit_str.value()),
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_ => None,
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})
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}
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