From f5ec40b8fbbe7d4409d94dafcbfcdd41b8a6202b Mon Sep 17 00:00:00 2001
From: Irene Knapp <ireneista@gmail.com>
Date: Fri, 25 Dec 2020 16:31:48 -0800
Subject: got the path stuff parsing just right

---
 src/path/parser.lalrpop | 82 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100644 src/path/parser.lalrpop

(limited to 'src/path/parser.lalrpop')

diff --git a/src/path/parser.lalrpop b/src/path/parser.lalrpop
new file mode 100644
index 0000000..0b3be9a
--- /dev/null
+++ b/src/path/parser.lalrpop
@@ -0,0 +1,82 @@
+grammar;
+
+use crate::path::GenericPath;
+use crate::path::GenericPathComponent;
+
+pub PathList: Vec<GenericPath> = {
+  => {
+    Vec::new()
+  },
+  <mut left:(<PathNoColons> COLON)*> <right:PathNoColons> => {
+    left.push(right);
+    left
+  },
+};
+
+pub PathListAllowingEmptyPaths: Vec<GenericPath> = {
+  => vec![GenericPath {
+    components: Vec::new(),
+    starts_with_slash: false,
+    ends_with_slash: false,
+  }],
+  PathNoColons => vec![<>],
+  <mut left:PathListAllowingEmptyPaths> COLON => {
+    left.push(GenericPath {
+      components: Vec::new(),
+      starts_with_slash: false,
+      ends_with_slash: false,
+    });
+    left
+  },
+  <mut left:PathListAllowingEmptyPaths> COLON <right:PathNoColons> => {
+    left.push(right);
+    left
+  },
+}
+
+pub PathNoColons: GenericPath = {
+  SLASH => GenericPath {
+    components: Vec::new(),
+    starts_with_slash: true,
+    ends_with_slash: true,
+  },
+  <PathNoColons2> => GenericPath {
+    components: <>,
+    starts_with_slash: false,
+    ends_with_slash: false,
+  },
+  <PathNoColons2> SLASH => GenericPath {
+    components: <>,
+    starts_with_slash: false,
+    ends_with_slash: true,
+  },
+  SLASH <PathNoColons2> => GenericPath {
+    components: <>,
+    starts_with_slash: true,
+    ends_with_slash: false,
+  },
+  SLASH <PathNoColons2> SLASH => GenericPath {
+    components: <>,
+    starts_with_slash: true,
+    ends_with_slash: true,
+  },
+}
+
+PathNoColons2: Vec<GenericPathComponent> = {
+  <PATH_COMPONENT_NO_COLONS> =>
+      vec![GenericPathComponent::FileOrDirectoryName(<>.to_string())],
+  <mut left:PathNoColons2> SLASH <right:PATH_COMPONENT_NO_COLONS> => {
+    left.push(GenericPathComponent::FileOrDirectoryName(right.to_string()));
+    left
+  }
+}
+
+// Whitespace is not allowed.
+match {
+  r"[^z:/]+" => PATH_COMPONENT_NO_COLONS,
+
+  r"/" => SLASH,
+
+  ":" => COLON,
+}
+
-- 
cgit 1.4.1