Implement if-else conditions

if
if!
elif
elif!
else

The expression should evaluate to true of false. The if! and elif!
versions are provided as shortcuts to writing if (!...).

See tests/if-else for examples.

1 files changed, 114 insertions, 0 deletions

diff --git a/tests/if-else/buildfile b/tests/if-else/buildfile
new file mode 100644
index 0000000..30da40f
--- /dev/null
+++ b/tests/if-else/buildfile
@@ -0,0 +1,114 @@
+#else     # else without if
+#elif     # elif without if
+#elif!    # elif! without if
+#if       # expected if-expression
+#if test  # expected true or false
+#if true  # expected {
+#x
+#if true   # expected newline after {
+#{x
+#if true   # expected newline after }
+#{
+#}x
+
+if true
+{
+  print 1
+}
+else
+{
+  print 0
+}
+
+if! true
+{
+  print 0
+}
+else
+{
+  print 1
+}
+
+if false
+{
+  print 0
+}
+else
+{
+  print 1
+}
+
+if false
+{
+  print 0
+}
+elif true
+{
+  print 1
+}
+else
+{
+  print 0
+}
+
+if true
+{
+  print 1
+}
+elif true
+{
+  print 0
+}
+else
+{
+  print 0
+}
+
+# Empty block
+#
+if true
+{
+}
+else
+{
+  print 0
+}
+
+# Nested if-else
+#
+if true
+{
+  if true
+  {
+    print 1
+  }
+}
+else
+{
+  if true
+  {
+    print 0
+  }
+}
+
+t = true
+f = false
+
+if $t
+{
+  print 1
+}
+
+if! $f
+{
+  print 1
+}
+
+./:
+
+# EOF test.
+#
+if true
+{
+  print 1
+}