Prepare VM design

1 files changed, 22 insertions, 0 deletions

diff --git a/src/pattern.rs b/src/pattern.rs
new file mode 100644
index 0000000..8c57f00
--- /dev/null
+++ b/src/pattern.rs
@@ -0,0 +1,22 @@
+use crate::PatternTypes;
+use crate::errors::PatternError;
+use crate::parser::parse;
+use crate::vm::Matcher;
+use crate::vm::PatternConstants;
+use crate::vm::MAX_CALLS;
+
+pub struct Pattern<T: PatternTypes> {
+    constants: PatternConstants<T>,
+}
+
+impl<T: PatternTypes> Pattern<T> {
+    pub fn compile(s: &str) -> Result<Self, PatternError> {
+        Ok(Self {
+            constants: parse(s)?
+        })
+    }
+
+    pub fn attempt_match<'a, 'b>(&'a self, value: &'b T::Value) -> Matcher<'a, 'b, T> {
+        Matcher::new(value, &self.constants, self.constants.protos.len() - 1, MAX_CALLS).ok().expect("datafu internal error: MAX_CALLS must not be 0")
+    }
+}