hoa: add alias support

* src/hoaparse/hoaparse.yy: Here.
* src/tgbatest/hoaparse.test: Test it.

src/tgbatest/hoaparse.test

@@ -322,3 +322,67 @@ EOF
 expecterr input <<EOF
 input:13.7: too many transition for this state, ignoring this one
 EOF
+
+
+cat >input <<EOF
+    HOA: v1
+    name: "GFa & GF(b & c)"
+    States: 1
+    Start: 0
+    acc-name: generalized-Buchi 2
+    Acceptance: 2 (Inf(0) & Inf(1))
+    AP: 3 "a" "b" "c"
+    Alias: @a 0
+    Alias: @a 1 & 2 /* should be @bc */
+    --BODY--
+    State: 0
+    [!@a & !@bc] 0
+    [@a & !@bc]  0 {0}
+    [!@a & @bc]  0 {1}
+    [@a & @bc]   0 {0 1}
+    --END--
+EOF
+
+expecterr input <<EOF
+input:9.5-19: ignoring redefinition of alias @a
+input:12.13-15: unknown alias @bc
+input:13.12-14: unknown alias @bc
+input:14.12-14: unknown alias @bc
+input:15.11-13: unknown alias @bc
+EOF
+
+cat >input <<EOF
+    HOA: v1
+    name: "GFa & GF(b & c)"
+    States: 1
+    Start: 0
+    acc-name: generalized-Buchi 2
+    Acceptance: 2 (Inf(0) & Inf(1))
+    AP: 3 "a" "b" "c"
+    Alias: @a 0
+    Alias: @bc 1 & 2
+    --BODY--
+    State: 0
+    [!@a & !@bc] 0
+    [@a & !@bc]  0 {0}
+    [!@a & @bc]  0 {1}
+    [@a & @bc]   0 {0 1}
+    --END--
+EOF
+
+expectok input <<EOF
+HOA: v1
+States: 1
+Start: 0
+AP: 3 "a" "b" "c"
+acc-name: generalized-Buchi 2
+Acceptance: 2 Inf(0)&Inf(1)
+properties: trans-labels explicit-labels trans-acc complete deterministic
+--BODY--
+State: 0
+[!0&!1 | !0&!2] 0
+[0&!1 | 0&!2] 0 {0}
+[!0&1&2] 0 {1}
+[0&1&2] 0 {0 1}
+--END--
+EOF