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42 lines
1.3 KiB
42 lines
1.3 KiB
4 months ago
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use syn::ext::IdentExt;
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use syn::parse::{ParseStream, Result};
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use syn::{Ident, LitStr, Token};
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pub struct QualifiedName {
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pub segments: Vec<Ident>,
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}
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impl QualifiedName {
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pub fn parse_unquoted(input: ParseStream) -> Result<Self> {
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let mut segments = Vec::new();
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let mut trailing_punct = true;
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let leading_colons: Option<Token![::]> = input.parse()?;
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while trailing_punct && input.peek(Ident::peek_any) {
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let ident = Ident::parse_any(input)?;
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segments.push(ident);
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let colons: Option<Token![::]> = input.parse()?;
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trailing_punct = colons.is_some();
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}
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if segments.is_empty() && leading_colons.is_none() {
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return Err(input.error("expected path"));
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} else if trailing_punct {
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return Err(input.error("expected path segment"));
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}
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Ok(QualifiedName { segments })
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}
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pub fn parse_quoted_or_unquoted(input: ParseStream) -> Result<Self> {
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if input.peek(LitStr) {
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let lit: LitStr = input.parse()?;
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if lit.value().is_empty() {
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let segments = Vec::new();
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Ok(QualifiedName { segments })
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} else {
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lit.parse_with(Self::parse_unquoted)
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}
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} else {
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Self::parse_unquoted(input)
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}
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}
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}
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