64 lines
1.8 KiB
Rust
64 lines
1.8 KiB
Rust
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// SPDX-License-Identifier: GPL-2.0
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use proc_macro::{token_stream, TokenTree};
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pub(crate) fn try_ident(it: &mut token_stream::IntoIter) -> Option<String> {
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if let Some(TokenTree::Ident(ident)) = it.next() {
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Some(ident.to_string())
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} else {
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None
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}
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}
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pub(crate) fn try_literal(it: &mut token_stream::IntoIter) -> Option<String> {
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if let Some(TokenTree::Literal(literal)) = it.next() {
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Some(literal.to_string())
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} else {
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None
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}
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}
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pub(crate) fn try_string(it: &mut token_stream::IntoIter) -> Option<String> {
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try_literal(it).and_then(|string| {
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if string.starts_with('\"') && string.ends_with('\"') {
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let content = &string[1..string.len() - 1];
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if content.contains('\\') {
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panic!("Escape sequences in string literals not yet handled");
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}
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Some(content.to_string())
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} else if string.starts_with("r\"") {
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panic!("Raw string literals are not yet handled");
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} else {
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None
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}
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})
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}
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pub(crate) fn expect_ident(it: &mut token_stream::IntoIter) -> String {
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try_ident(it).expect("Expected Ident")
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}
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pub(crate) fn expect_punct(it: &mut token_stream::IntoIter) -> char {
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if let TokenTree::Punct(punct) = it.next().expect("Reached end of token stream for Punct") {
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punct.as_char()
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} else {
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panic!("Expected Punct");
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}
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}
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pub(crate) fn expect_string(it: &mut token_stream::IntoIter) -> String {
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try_string(it).expect("Expected string")
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}
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pub(crate) fn expect_string_ascii(it: &mut token_stream::IntoIter) -> String {
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let string = try_string(it).expect("Expected string");
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assert!(string.is_ascii(), "Expected ASCII string");
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string
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}
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pub(crate) fn expect_end(it: &mut token_stream::IntoIter) {
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if it.next().is_some() {
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panic!("Expected end");
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}
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}
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