Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 186 insertions, 0 deletions

diff --git a/third_party/rust/cssparser-macros/lib.rs b/third_party/rust/cssparser-macros/lib.rs
new file mode 100644
index 0000000000..64d749f04b
--- /dev/null
+++ b/third_party/rust/cssparser-macros/lib.rs
@@ -0,0 +1,186 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+extern crate proc_macro;
+
+use proc_macro::TokenStream;
+
+#[proc_macro]
+pub fn _cssparser_internal_max_len(input: TokenStream) -> TokenStream {
+    struct Input {
+        max_length: usize,
+    }
+
+    impl syn::parse::Parse for Input {
+        fn parse(input: syn::parse::ParseStream) -> syn::parse::Result<Self> {
+            let mut max_length = 0;
+            while !input.is_empty() {
+                if input.peek(syn::Token![_]) {
+                    input.parse::<syn::Token![_]>().unwrap();
+                    continue;
+                }
+                let lit: syn::LitStr = input.parse()?;
+                let value = lit.value();
+                if value.to_ascii_lowercase() != value {
+                    return Err(syn::Error::new(lit.span(), "must be ASCII-lowercase"));
+                }
+                max_length = max_length.max(value.len());
+            }
+            Ok(Input { max_length })
+        }
+    }
+
+    let Input { max_length } = syn::parse_macro_input!(input);
+    quote::quote!(
+        pub(super) const MAX_LENGTH: usize = #max_length;
+    )
+    .into()
+}
+
+fn get_byte_from_expr_lit(expr: &syn::Expr) -> u8 {
+    match *expr {
+        syn::Expr::Lit(syn::ExprLit { ref lit, .. }) => {
+            if let syn::Lit::Byte(ref byte) = *lit {
+                byte.value()
+            } else {
+                panic!("Found a pattern that wasn't a byte")
+            }
+        }
+        _ => unreachable!(),
+    }
+}
+
+/// Parse a pattern and fill the table accordingly
+fn parse_pat_to_table<'a>(
+    pat: &'a syn::Pat,
+    case_id: u8,
+    wildcard: &mut Option<&'a syn::Ident>,
+    table: &mut [u8; 256],
+) {
+    match pat {
+        &syn::Pat::Lit(syn::PatLit { ref expr, .. }) => {
+            let value = get_byte_from_expr_lit(expr);
+            if table[value as usize] == 0 {
+                table[value as usize] = case_id;
+            }
+        }
+        &syn::Pat::Range(syn::PatRange { ref lo, ref hi, .. }) => {
+            let lo = get_byte_from_expr_lit(lo);
+            let hi = get_byte_from_expr_lit(hi);
+            for value in lo..hi {
+                if table[value as usize] == 0 {
+                    table[value as usize] = case_id;
+                }
+            }
+            if table[hi as usize] == 0 {
+                table[hi as usize] = case_id;
+            }
+        }
+        &syn::Pat::Wild(_) => {
+            for byte in table.iter_mut() {
+                if *byte == 0 {
+                    *byte = case_id;
+                }
+            }
+        }
+        &syn::Pat::Ident(syn::PatIdent { ref ident, .. }) => {
+            assert_eq!(*wildcard, None);
+            *wildcard = Some(ident);
+            for byte in table.iter_mut() {
+                if *byte == 0 {
+                    *byte = case_id;
+                }
+            }
+        }
+        &syn::Pat::Or(syn::PatOr { ref cases, .. }) => {
+            for case in cases {
+                parse_pat_to_table(case, case_id, wildcard, table);
+            }
+        }
+        _ => {
+            panic!("Unexpected pattern: {:?}. Buggy code ?", pat);
+        }
+    }
+}
+
+/// Expand a TokenStream corresponding to the `match_byte` macro.
+///
+/// ## Example
+///
+/// ```rust
+/// match_byte! { tokenizer.next_byte_unchecked(),
+///     b'a'..b'z' => { ... }
+///     b'0'..b'9' => { ... }
+///     b'\n' | b'\\' => { ... }
+///     foo => { ... }
+///  }
+///  ```
+///
+#[proc_macro]
+pub fn match_byte(input: TokenStream) -> TokenStream {
+    use syn::spanned::Spanned;
+    struct MatchByte {
+        expr: syn::Expr,
+        arms: Vec<syn::Arm>,
+    }
+
+    impl syn::parse::Parse for MatchByte {
+        fn parse(input: syn::parse::ParseStream) -> syn::Result<Self> {
+            Ok(MatchByte {
+                expr: {
+                    let expr = input.parse()?;
+                    input.parse::<syn::Token![,]>()?;
+                    expr
+                },
+                arms: {
+                    let mut arms = Vec::new();
+                    while !input.is_empty() {
+                        let arm = input.call(syn::Arm::parse)?;
+                        assert!(arm.guard.is_none(), "match_byte doesn't support guards");
+                        assert!(
+                            arm.attrs.is_empty(),
+                            "match_byte doesn't support attributes"
+                        );
+                        arms.push(arm);
+                    }
+                    arms
+                },
+            })
+        }
+    }
+    let MatchByte { expr, arms } = syn::parse_macro_input!(input);
+
+    let mut cases = Vec::new();
+    let mut table = [0u8; 256];
+    let mut match_body = Vec::new();
+    let mut wildcard = None;
+    for (i, ref arm) in arms.iter().enumerate() {
+        let case_id = i + 1;
+        let index = case_id as isize;
+        let name = syn::Ident::new(&format!("Case{}", case_id), arm.span());
+        let pat = &arm.pat;
+        parse_pat_to_table(pat, case_id as u8, &mut wildcard, &mut table);
+
+        cases.push(quote::quote!(#name = #index));
+        let body = &arm.body;
+        match_body.push(quote::quote!(Case::#name => { #body }))
+    }
+
+    let en = quote::quote!(enum Case {
+        #(#cases),*
+    });
+
+    let mut table_content = Vec::new();
+    for entry in table.iter() {
+        let name: syn::Path = syn::parse_str(&format!("Case::Case{}", entry)).unwrap();
+        table_content.push(name);
+    }
+    let table = quote::quote!(static __CASES: [Case; 256] = [#(#table_content),*];);
+
+    if let Some(binding) = wildcard {
+        quote::quote!({ #en #table let #binding = #expr; match __CASES[#binding as usize] { #(#match_body),* }})
+    } else {
+        quote::quote!({ #en #table match __CASES[#expr as usize] { #(#match_body),* }})
+    }.into()
+}