1 files changed, 173 insertions, 0 deletions
diff --git a/systems/sheet/src/mapping_pattern.rs b/systems/sheet/src/mapping_pattern.rs
new file mode 100644
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+++ b/systems/sheet/src/mapping_pattern.rs
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+// Mapping Pattern
+// 是用来匹配多个 Mapping 的语法
+//
+// ~ 当前 Sheet
+//
+// 省略机制
+//
+// 如果上下文有sheet，那就是
+// mapping/file.suffix
+//
+// 如果没有sheet，那就是
+// sheet:/mapping/file.suffix
+//
+// 可以使用路径语法
+//
+// sheet:/mapping/../file.suffix
+//
+// 使用以下逻辑匹配文件
+//
+// sheet:/. 匹配 sheet 中 / 下所有文件
+// sheet:/arts/. 匹配结果为 sheet:/arts/ 下的文件
+// sheet:/arts/ 匹配结果为 sheet:/arts/ 下的文件
+// sheet:/arts 匹配结果为 sheet:/arts 文件夹
+//
+// 文件名匹配机制
+//
+// *.md 匹配所有 md 文件
+// [Mm]essages 匹配 Message 或 message
+// 使用\[Mm\]essage 匹配 [Mm]essage
+// 使用 ** 匹配目录下所有文件（递归）
+// 使用 * 匹配目录下所有文件
+// 使用 ![XX] 匹配排除以外的所有文件，例如：
+//
+// ![README.md]* 匹配除名叫 README.md 以外的所有当前目录下的文件
+// ![[Rr][Ee][Aa][Dd][Mm][Ee].[Mm][Dd]]** 匹配所有 不叫 README.md 的文件
+//
+// ![**/temp]** 匹配所有不在temp目录的文件
+//
+// MappingPattern会根据MappingContext生成MappingPatternResult
+// 准确来说是
+// PatternResult::Single Or PatternResult::Multi
+// PatternResult可以unwrap为single()或multi()
+
+use crate::mapping::MappingBuf;
+
+pub struct MappingPattern {}
+
+#[derive(Debug, PartialEq, Eq, Clone)]
+pub enum MappingPatternResult {
+    Single(MappingBuf),
+    Multi(Vec<MappingBuf>),
+}
+
+impl MappingPatternResult {
+    pub fn new_single(mapping: MappingBuf) -> Self {
+        Self::Single(mapping)
+    }
+
+    pub fn new_multi(mappings: Vec<MappingBuf>) -> Self {
+        Self::Multi(mappings)
+    }
+
+    pub fn is_single(&self) -> bool {
+        match self {
+            MappingPatternResult::Single(_) => true,
+            MappingPatternResult::Multi(_) => false,
+        }
+    }
+
+    pub fn is_multi(&self) -> bool {
+        match self {
+            MappingPatternResult::Single(_) => false,
+            MappingPatternResult::Multi(_) => true,
+        }
+    }
+
+    pub fn single(self) -> Option<MappingBuf> {
+        match self {
+            MappingPatternResult::Single(mapping) => Some(mapping),
+            MappingPatternResult::Multi(_) => None,
+        }
+    }
+
+    pub fn multi(self) -> Option<Vec<MappingBuf>> {
+        match self {
+            MappingPatternResult::Single(_) => None,
+            MappingPatternResult::Multi(mappings) => Some(mappings),
+        }
+    }
+
+    pub fn ensure_multi(self) -> Vec<MappingBuf> {
+        match self {
+            MappingPatternResult::Single(mapping) => vec![mapping],
+            MappingPatternResult::Multi(mappings) => mappings,
+        }
+    }
+
+    pub fn unwrap_single(self) -> MappingBuf {
+        match self {
+            MappingPatternResult::Single(mapping) => mapping,
+            MappingPatternResult::Multi(_) => panic!("Called `unwrap_single()` on a `Multi` value"),
+        }
+    }
+
+    pub fn unwrap_multi(self) -> Vec<MappingBuf> {
+        match self {
+            MappingPatternResult::Single(_) => {
+                panic!("Called `unwrap_multi()` on a `Single` value")
+            }
+            MappingPatternResult::Multi(mappings) => mappings,
+        }
+    }
+
+    pub fn unwrap_single_or(self, or: MappingBuf) -> MappingBuf {
+        match self {
+            MappingPatternResult::Single(mapping) => mapping,
+            MappingPatternResult::Multi(_) => or,
+        }
+    }
+
+    pub fn unwrap_multi_or(self, or: Vec<MappingBuf>) -> Vec<MappingBuf> {
+        match self {
+            MappingPatternResult::Single(_) => or,
+            MappingPatternResult::Multi(mappings) => mappings,
+        }
+    }
+
+    pub fn unwrap_single_or_else<F>(self, or: F) -> MappingBuf
+    where
+        F: FnOnce() -> MappingBuf,
+    {
+        match self {
+            MappingPatternResult::Single(mapping) => mapping,
+            MappingPatternResult::Multi(_) => or(),
+        }
+    }
+
+    pub fn unwrap_multi_or_else<F>(self, or: F) -> Vec<MappingBuf>
+    where
+        F: FnOnce() -> Vec<MappingBuf>,
+    {
+        match self {
+            MappingPatternResult::Single(_) => or(),
+            MappingPatternResult::Multi(mappings) => mappings,
+        }
+    }
+
+    pub fn len(&self) -> usize {
+        match self {
+            MappingPatternResult::Single(_) => 1,
+            MappingPatternResult::Multi(mappings) => mappings.len(),
+        }
+    }
+
+    pub fn is_empty(&self) -> bool {
+        match self {
+            MappingPatternResult::Single(_) => false,
+            MappingPatternResult::Multi(mappings) => mappings.len() < 1,
+        }
+    }
+}
+
+impl IntoIterator for MappingPatternResult {
+    type Item = MappingBuf;
+    type IntoIter = std::vec::IntoIter<MappingBuf>;
+
+    fn into_iter(self) -> Self::IntoIter {
+        match self {
+            MappingPatternResult::Single(m) => vec![m].into_iter(),
+            MappingPatternResult::Multi(v) => v.into_iter(),
+        }
+    }
+}