Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

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

1 files changed, 188 insertions, 0 deletions

diff --git a/servo/components/selectors/attr.rs b/servo/components/selectors/attr.rs
new file mode 100644
index 0000000000..9212f8c3a6
--- /dev/null
+++ b/servo/components/selectors/attr.rs
@@ -0,0 +1,188 @@
+/* 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 https://mozilla.org/MPL/2.0/. */
+
+use crate::parser::SelectorImpl;
+use cssparser::ToCss;
+use std::fmt;
+
+#[derive(Clone, Eq, PartialEq, ToShmem)]
+#[shmem(no_bounds)]
+pub struct AttrSelectorWithOptionalNamespace<Impl: SelectorImpl> {
+    #[shmem(field_bound)]
+    pub namespace: Option<NamespaceConstraint<(Impl::NamespacePrefix, Impl::NamespaceUrl)>>,
+    #[shmem(field_bound)]
+    pub local_name: Impl::LocalName,
+    pub local_name_lower: Impl::LocalName,
+    #[shmem(field_bound)]
+    pub operation: ParsedAttrSelectorOperation<Impl::AttrValue>,
+    pub never_matches: bool,
+}
+
+impl<Impl: SelectorImpl> AttrSelectorWithOptionalNamespace<Impl> {
+    pub fn namespace(&self) -> Option<NamespaceConstraint<&Impl::NamespaceUrl>> {
+        self.namespace.as_ref().map(|ns| match ns {
+            NamespaceConstraint::Any => NamespaceConstraint::Any,
+            NamespaceConstraint::Specific((_, ref url)) => NamespaceConstraint::Specific(url),
+        })
+    }
+}
+
+#[derive(Clone, Eq, PartialEq, ToShmem)]
+pub enum NamespaceConstraint<NamespaceUrl> {
+    Any,
+
+    /// Empty string for no namespace
+    Specific(NamespaceUrl),
+}
+
+#[derive(Clone, Eq, PartialEq, ToShmem)]
+pub enum ParsedAttrSelectorOperation<AttrValue> {
+    Exists,
+    WithValue {
+        operator: AttrSelectorOperator,
+        case_sensitivity: ParsedCaseSensitivity,
+        expected_value: AttrValue,
+    },
+}
+
+#[derive(Clone, Eq, PartialEq)]
+pub enum AttrSelectorOperation<AttrValue> {
+    Exists,
+    WithValue {
+        operator: AttrSelectorOperator,
+        case_sensitivity: CaseSensitivity,
+        expected_value: AttrValue,
+    },
+}
+
+impl<AttrValue> AttrSelectorOperation<AttrValue> {
+    pub fn eval_str(&self, element_attr_value: &str) -> bool
+    where
+        AttrValue: AsRef<str>,
+    {
+        match *self {
+            AttrSelectorOperation::Exists => true,
+            AttrSelectorOperation::WithValue {
+                operator,
+                case_sensitivity,
+                ref expected_value,
+            } => operator.eval_str(
+                element_attr_value,
+                expected_value.as_ref(),
+                case_sensitivity,
+            ),
+        }
+    }
+}
+
+#[derive(Clone, Copy, Eq, PartialEq, ToShmem)]
+pub enum AttrSelectorOperator {
+    Equal,
+    Includes,
+    DashMatch,
+    Prefix,
+    Substring,
+    Suffix,
+}
+
+impl ToCss for AttrSelectorOperator {
+    fn to_css<W>(&self, dest: &mut W) -> fmt::Result
+    where
+        W: fmt::Write,
+    {
+        // https://drafts.csswg.org/cssom/#serializing-selectors
+        // See "attribute selector".
+        dest.write_str(match *self {
+            AttrSelectorOperator::Equal => "=",
+            AttrSelectorOperator::Includes => "~=",
+            AttrSelectorOperator::DashMatch => "|=",
+            AttrSelectorOperator::Prefix => "^=",
+            AttrSelectorOperator::Substring => "*=",
+            AttrSelectorOperator::Suffix => "$=",
+        })
+    }
+}
+
+impl AttrSelectorOperator {
+    pub fn eval_str(
+        self,
+        element_attr_value: &str,
+        attr_selector_value: &str,
+        case_sensitivity: CaseSensitivity,
+    ) -> bool {
+        let e = element_attr_value.as_bytes();
+        let s = attr_selector_value.as_bytes();
+        let case = case_sensitivity;
+        match self {
+            AttrSelectorOperator::Equal => case.eq(e, s),
+            AttrSelectorOperator::Prefix => e.len() >= s.len() && case.eq(&e[..s.len()], s),
+            AttrSelectorOperator::Suffix => {
+                e.len() >= s.len() && case.eq(&e[(e.len() - s.len())..], s)
+            },
+            AttrSelectorOperator::Substring => {
+                case.contains(element_attr_value, attr_selector_value)
+            },
+            AttrSelectorOperator::Includes => element_attr_value
+                .split(SELECTOR_WHITESPACE)
+                .any(|part| case.eq(part.as_bytes(), s)),
+            AttrSelectorOperator::DashMatch => {
+                case.eq(e, s) || (e.get(s.len()) == Some(&b'-') && case.eq(&e[..s.len()], s))
+            },
+        }
+    }
+}
+
+/// The definition of whitespace per CSS Selectors Level 3 § 4.
+pub static SELECTOR_WHITESPACE: &[char] = &[' ', '\t', '\n', '\r', '\x0C'];
+
+#[derive(Clone, Copy, Debug, Eq, PartialEq, ToShmem)]
+pub enum ParsedCaseSensitivity {
+    /// 's' was specified.
+    ExplicitCaseSensitive,
+    /// 'i' was specified.
+    AsciiCaseInsensitive,
+    /// No flags were specified and HTML says this is a case-sensitive attribute.
+    CaseSensitive,
+    /// No flags were specified and HTML says this is a case-insensitive attribute.
+    AsciiCaseInsensitiveIfInHtmlElementInHtmlDocument,
+}
+
+#[derive(Clone, Copy, Debug, Eq, PartialEq)]
+pub enum CaseSensitivity {
+    CaseSensitive,
+    AsciiCaseInsensitive,
+}
+
+impl CaseSensitivity {
+    pub fn eq(self, a: &[u8], b: &[u8]) -> bool {
+        match self {
+            CaseSensitivity::CaseSensitive => a == b,
+            CaseSensitivity::AsciiCaseInsensitive => a.eq_ignore_ascii_case(b),
+        }
+    }
+
+    pub fn contains(self, haystack: &str, needle: &str) -> bool {
+        match self {
+            CaseSensitivity::CaseSensitive => haystack.contains(needle),
+            CaseSensitivity::AsciiCaseInsensitive => {
+                if let Some((&n_first_byte, n_rest)) = needle.as_bytes().split_first() {
+                    haystack.bytes().enumerate().any(|(i, byte)| {
+                        if !byte.eq_ignore_ascii_case(&n_first_byte) {
+                            return false;
+                        }
+                        let after_this_byte = &haystack.as_bytes()[i + 1..];
+                        match after_this_byte.get(..n_rest.len()) {
+                            None => false,
+                            Some(haystack_slice) => haystack_slice.eq_ignore_ascii_case(n_rest),
+                        }
+                    })
+                } else {
+                    // any_str.contains("") == true,
+                    // though these cases should be handled with *NeverMatches and never go here.
+                    true
+                }
+            },
+        }
+    }
+}