Add ECL programming language and test

lib/linguist/languages.yml

@@ -367,6 +367,13 @@ Ecere Projects:
   extensions:
   - .epj
 
+Ecl:
+  type: programming
+  primary_extension: .ecl
+  lexer: ECL
+  extensions:
+  - .eclxml
+
 Eiffel:
   type: programming
   lexer: Text only

samples/ecl/sample.ecl

@@ -0,0 +1,42 @@
+/* 
+ * Multi-line comment
+ */
+#option ('slidingJoins', true);
+
+namesRecord :=
+            RECORD
+string20        surname;
+string10        forename;
+integer2        age;
+integer2        dadAge;
+integer2        mumAge;
+            END;
+
+namesRecord2 :=
+            record
+string10        extra;
+namesRecord;
+            end;
+
+namesTable := dataset('x',namesRecord,FLAT);
+namesTable2 := dataset('y',namesRecord2,FLAT);
+
+integer2 aveAgeL(namesRecord l) := (l.dadAge+l.mumAge)/2;
+integer2 aveAgeR(namesRecord2 r) := (r.dadAge+r.mumAge)/2;
+
+// Standard join on a function of left and right
+output(join(namesTable, namesTable2, aveAgeL(left) = aveAgeR(right)));
+
+//Several simple examples of sliding join syntax
+output(join(namesTable, namesTable2, left.age >= right.age - 10 and left.age <= right.age +10));
+output(join(namesTable, namesTable2, left.age between right.age - 10 and right.age +10));
+output(join(namesTable, namesTable2, left.age between right.age + 10 and right.age +30));
+output(join(namesTable, namesTable2, left.age between (right.age + 20) - 10 and (right.age +20) + 10));
+output(join(namesTable, namesTable2, aveAgeL(left) between aveAgeR(right)+10 and aveAgeR(right)+40));
+
+//Same, but on strings.  Also includes age to ensure sort is done by non-sliding before sliding.
+output(join(namesTable, namesTable2, left.surname between right.surname[1..10]+'AAAAAAAAAA' and right.surname[1..10]+'ZZZZZZZZZZ' and left.age=right.age));
+output(join(namesTable, namesTable2, left.surname between right.surname[1..10]+'AAAAAAAAAA' and right.surname[1..10]+'ZZZZZZZZZZ' and left.age=right.age,all));
+
+//This should not generate a self join
+output(join(namesTable, namesTable, left.age between right.age - 10 and right.age +10));