1 files changed, 77 insertions, 0 deletions
diff --git a/crates/shirabe-semver/src/constraint/bound.rs b/crates/shirabe-semver/src/constraint/bound.rs
index 6037f0d..1a63fc3 100644
--- a/crates/shirabe-semver/src/constraint/bound.rs
+++ b/crates/shirabe-semver/src/constraint/bound.rs
@@ -1 +1,78 @@
 //! ref: composer/vendor/composer/semver/src/Constraint/Bound.php
+
+use anyhow::bail;
+
+use shirabe_php_shim as php;
+
+#[derive(Debug, PartialEq)]
+pub struct Bound {
+    version: String,
+    is_inclusive: bool,
+}
+
+impl Bound {
+    pub fn new(version: String, is_inclusive: bool) -> Self {
+        Self {
+            version,
+            is_inclusive,
+        }
+    }
+
+    pub fn get_version(&self) -> &str {
+        &self.version
+    }
+
+    pub fn is_inclusive(&self) -> bool {
+        self.is_inclusive
+    }
+
+    pub fn is_zero(&self) -> bool {
+        self.get_version() == "0.0.0.0-dev" && self.is_inclusive()
+    }
+
+    pub fn is_positive_infinity(&self) -> bool {
+        self.get_version() == format!("{}.0.0.0", i64::MAX) && !self.is_inclusive()
+    }
+
+    pub fn compare_to(&self, other: &Bound, operator: &str) -> anyhow::Result<bool> {
+        if operator != "<" && operator != ">" {
+            bail!("Does not support any other operator other than > or <.");
+        }
+
+        if self == other {
+            return Ok(false);
+        }
+
+        let compare_result = php::version_compare_2(self.get_version(), other.get_version());
+
+        if compare_result != 0 {
+            return Ok((if operator == ">" { 1 } else { -1 }) == compare_result);
+        }
+
+        Ok(if operator == ">" {
+            other.is_inclusive()
+        } else {
+            !other.is_inclusive()
+        })
+    }
+
+    pub fn __to_string(&self) -> String {
+        format!(
+            "{} [{}]",
+            self.get_version(),
+            if self.is_inclusive() {
+                "inclusive"
+            } else {
+                "exclusive"
+            }
+        )
+    }
+
+    pub fn zero() -> Self {
+        Bound::new("0.0.0.0-dev".to_string(), true)
+    }
+
+    pub fn positive_infinity() -> Self {
+        Bound::new(format!("{}.0.0.0", i64::MAX), false)
+    }
+}