tinyyarn

commit 71ea6565b6acee663aa34db56ff4f4a10c2211ef
parent 7bb5d2a1825bc323afa9e44e727c440dc2573333
Author: Richard Ipsum <richardipsum@fastmail.co.uk>
Date:   Mon, 20 May 2019 19:52:42 +0100

Handle multiple matching implementations

Diffstat:
M
tyarn.in
 | 
16
++++++++++++----

1 file changed, 12 insertions(+), 4 deletions(-)
diff --git a/tyarn.in b/tyarn.in
@@ -199,15 +199,23 @@ function parse_scenarios(filepath)
 end
 
 function find_matching_implementation(implementations, step)
-    for patt, impl in pairs(implementations) do
+    -- In the event we have more than one matching implementation
+    -- pick the implementation that has the longest pattern.
+
+    local ret_impl = nil
+    local ret_matches = nil
+    local ret_patt = ""
 
+    for patt, impl in pairs(implementations) do
         matched, matches = tyarn.re_match(step, string.format("^%s$", patt))
-        if matched then
-            return impl, matches
+        if matched and string.len(patt) > string.len(ret_patt) then
+            ret_impl = impl
+            ret_matches = matches
+            ret_patt = patt
         end
     end
 
-    return nil, nil
+    return ret_impl, ret_matches
 end
 
 function load_shell_library(path)