Multi-commit:

- Fix a bunch of bugs found during the debut of the LSL calculator.
- Add infrastructure for functions to be able to produce a result or not depending on arguments. Fixes the llBase64ToInteger/llXorBase64/llXorBase64StringsCorrect cases where they are not deterministic, and allows for the addition of some extra functions whose value can be determined in some cases (e.g. llDetectedType(-1) is always 0). Added several such functions in a new module.
- Add the constant folding option to the help and the default options.

lslopt/lslextrafuncs.py

@@ -0,0 +1,110 @@
+from lslcommon import *
+from lslbasefuncs import ELSLCantCompute, isinteger, \
+  isvector, NULL_KEY, ZERO_VECTOR, ZERO_ROTATION
+#isfloat, isstring, iskey, isrotation, islist
+
+TouchEvents = ('touch', 'touch_start', 'touch_end')
+DetectionEvents = ('touch', 'touch_start', 'touch_end',
+                   'collision', 'collision_start', 'collision_end',
+                   'sensor')
+
+def llCloud(v):
+    assert isvector(v)
+    return 0.0
+
+def llAvatarOnLinkSitTarget(link):
+    assert isinteger(link)
+    if link > 255 or link == -2147483648:
+        return Key(NULL_KEY)
+    raise ELSLCantCompute
+
+def llDetectedGrab(idx, event=None):
+    assert isinteger(idx)
+    if 0 <= idx <= 15 and (event == 'touch' or event is None):
+        raise ELSLCantCompute
+    return ZERO_VECTOR
+
+def llDetectedGroup(idx, event=None):
+    assert isinteger(idx)
+    if 0 <= idx <= 15 and (event in DetectionEvents or event is None):
+        raise ELSLCantCompute
+    return 0
+
+def llDetectedKey(idx, event=None):
+    assert isinteger(idx)
+    if 0 <= idx <= 15 and (event in DetectionEvents or event is None):
+        raise ELSLCantCompute
+    return Key(NULL_KEY)
+
+def llDetectedLinkNumber(idx, event=None):
+    assert isinteger(idx)
+    if 0 <= idx <= 15 and (event in DetectionEvents or event is None):
+        raise ELSLCantCompute
+    return 0
+
+def llDetectedName(idx, event=None):
+    assert isinteger(idx)
+    if 0 <= idx <= 15 and (event in DetectionEvents or event is None):
+        raise ELSLCantCompute
+    return u''
+
+def llDetectedOwner(idx, event=None):
+    assert isinteger(idx)
+    if 0 <= idx <= 15 and (event in DetectionEvents or event is None):
+        raise ELSLCantCompute
+    return Key(NULL_KEY)
+
+def llDetectedPos(idx, event=None):
+    assert isinteger(idx)
+    if 0 <= idx <= 15 and (event in DetectionEvents or event is None):
+        raise ELSLCantCompute
+    return ZERO_VECTOR
+
+def llDetectedRot(idx, event=None):
+    assert isinteger(idx)
+    if 0 <= idx <= 15 and (event in DetectionEvents or event is None):
+        raise ELSLCantCompute
+    return ZERO_ROTATION
+
+def llDetectedTouchBinormal(idx, event=None):
+    assert isinteger(idx)
+    if 0 <= idx <= 15 and (event in TouchEvents or event is None):
+        raise ELSLCantCompute
+    return ZERO_VECTOR
+
+def llDetectedTouchFace(idx, event=None):
+    assert isinteger(idx)
+    if 0 <= idx <= 15 and (event in TouchEvents or event is None):
+        raise ELSLCantCompute
+    return 0
+
+def llDetectedTouchNormal(idx, event=None):
+    assert isinteger(idx)
+    if 0 <= idx <= 15 and (event in TouchEvents or event is None):
+        raise ELSLCantCompute
+    return ZERO_VECTOR
+
+def llDetectedTouchPos(idx, event=None):
+    assert isinteger(idx)
+    if 0 <= idx <= 15 and (event in TouchEvents or event is None):
+        raise ELSLCantCompute
+    return ZERO_VECTOR
+
+def llDetectedTouchST(idx, event=None):
+    assert isinteger(idx)
+    if 0 <= idx <= 15 and (event in TouchEvents or event is None):
+        raise ELSLCantCompute
+    return ZERO_VECTOR
+
+def llDetectedTouchUV(idx, event=None):
+    assert isinteger(idx)
+    if 0 <= idx <= 15 and (event in TouchEvents or event is None):
+        raise ELSLCantCompute
+    return ZERO_VECTOR
+
+def llDetectedType(idx, event=None):
+    assert isinteger(idx)
+    if 0 <= idx <= 15 and (event in DetectionEvents or event is None):
+        raise ELSLCantCompute
+    return 0
+