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authorDavid Walter Seikel2012-01-19 13:59:45 +1000
committerDavid Walter Seikel2012-01-19 13:59:45 +1000
commit22dcf99d33bba85e719cf13ab77d534562a7647f (patch)
tree0bcd864d2377afee706af3fc3592a84257c44d20 /LuaSL/src
parentAdd a note about Lua truth values. (diff)
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More notes about Lua quirks.
Diffstat (limited to 'LuaSL/src')
-rw-r--r--LuaSL/src/LuaSL_compile.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/LuaSL/src/LuaSL_compile.c b/LuaSL/src/LuaSL_compile.c
index b9d6d48..1007c89 100644
--- a/LuaSL/src/LuaSL_compile.c
+++ b/LuaSL/src/LuaSL_compile.c
@@ -30,6 +30,9 @@ LSL_Token LSL_Tokens[] =
30// QUIRK - Seems to be some disagreement about BOOL_AND/BOOL_OR precedence. Either they are equal, or OR is higher. 30// QUIRK - Seems to be some disagreement about BOOL_AND/BOOL_OR precedence. Either they are equal, or OR is higher.
31// QUIRK - No boolean short circuiting. 31// QUIRK - No boolean short circuiting.
32// QUIRK - Booleans and conditionals are executed right to left. Or maybe not, depending on who you believe. 32// QUIRK - Booleans and conditionals are executed right to left. Or maybe not, depending on who you believe.
33// LUA - Short circiuts boolean operations, and goes left to right.
34// LUA - "and" returns its first argument if it is false, otherwise, it returns its second argument. "or" returns its first argument if it is not false, otherwise it returns its second argument.
35// Note that the above means that "and/or" can return any type.
33 {LSL_BOOL_OR, ST_BOOLEAN, "||", LSL_RIGHT2LEFT, NULL, evaluateOperationToken}, 36 {LSL_BOOL_OR, ST_BOOLEAN, "||", LSL_RIGHT2LEFT, NULL, evaluateOperationToken},
34 {LSL_BIT_OR, ST_BITWISE, "|", LSL_LEFT2RIGHT, NULL, evaluateOperationToken}, 37 {LSL_BIT_OR, ST_BITWISE, "|", LSL_LEFT2RIGHT, NULL, evaluateOperationToken},
35 {LSL_BIT_XOR, ST_BITWISE, "^", LSL_LEFT2RIGHT, NULL, evaluateOperationToken}, 38 {LSL_BIT_XOR, ST_BITWISE, "^", LSL_LEFT2RIGHT, NULL, evaluateOperationToken},
@@ -41,6 +44,7 @@ LSL_Token LSL_Tokens[] =
41 {LSL_LESS_EQUAL, ST_COMPARISON, "<=", LSL_RIGHT2LEFT, NULL, evaluateOperationToken}, 44 {LSL_LESS_EQUAL, ST_COMPARISON, "<=", LSL_RIGHT2LEFT, NULL, evaluateOperationToken},
42 {LSL_GREATER_THAN, ST_COMPARISON, ">", LSL_RIGHT2LEFT, NULL, evaluateOperationToken}, 45 {LSL_GREATER_THAN, ST_COMPARISON, ">", LSL_RIGHT2LEFT, NULL, evaluateOperationToken},
43 {LSL_LESS_THAN, ST_COMPARISON, "<", LSL_RIGHT2LEFT, NULL, evaluateOperationToken}, 46 {LSL_LESS_THAN, ST_COMPARISON, "<", LSL_RIGHT2LEFT, NULL, evaluateOperationToken},
47// LUA - comparisons are always false if they are different types. Tables, userdata, and functions are compared by reference. Strings campare in alphabetical order, depending on current locale.
44 {LSL_RIGHT_SHIFT, ST_BITWISE, ">>", LSL_LEFT2RIGHT, NULL, evaluateOperationToken}, 48 {LSL_RIGHT_SHIFT, ST_BITWISE, ">>", LSL_LEFT2RIGHT, NULL, evaluateOperationToken},
45 {LSL_LEFT_SHIFT, ST_BITWISE, "<<", LSL_LEFT2RIGHT, NULL, evaluateOperationToken}, 49 {LSL_LEFT_SHIFT, ST_BITWISE, "<<", LSL_LEFT2RIGHT, NULL, evaluateOperationToken},
46 {LSL_CONCATENATE, ST_ADD, "+", LSL_LEFT2RIGHT, NULL, evaluateOperationToken}, 50 {LSL_CONCATENATE, ST_ADD, "+", LSL_LEFT2RIGHT, NULL, evaluateOperationToken},
@@ -54,6 +58,17 @@ LSL_Token LSL_Tokens[] =
54 {LSL_NEGATION, ST_NEGATE, "-", LSL_RIGHT2LEFT | LSL_UNARY, NULL, evaluateOperationToken}, 58 {LSL_NEGATION, ST_NEGATE, "-", LSL_RIGHT2LEFT | LSL_UNARY, NULL, evaluateOperationToken},
55 {LSL_BOOL_NOT, ST_BOOL_NOT, "!", LSL_RIGHT2LEFT | LSL_UNARY, NULL, evaluateOperationToken}, 59 {LSL_BOOL_NOT, ST_BOOL_NOT, "!", LSL_RIGHT2LEFT | LSL_UNARY, NULL, evaluateOperationToken},
56 {LSL_BIT_NOT, ST_BIT_NOT, "~", LSL_RIGHT2LEFT | LSL_UNARY, NULL, evaluateOperationToken}, 60 {LSL_BIT_NOT, ST_BIT_NOT, "~", LSL_RIGHT2LEFT | LSL_UNARY, NULL, evaluateOperationToken},
61
62// LUA precedence - (it has no bit operators, at least not until 5.2, but LuaJIT has them.)
63// or
64// and
65// < > <= >= ~= ==
66// ..
67// + -
68// * /
69// not negate
70// exponentiation (^)
71
57 {LSL_TYPECAST_CLOSE, ST_NONE, ")", LSL_RIGHT2LEFT | LSL_UNARY, NULL, evaluateNoToken}, 72 {LSL_TYPECAST_CLOSE, ST_NONE, ")", LSL_RIGHT2LEFT | LSL_UNARY, NULL, evaluateNoToken},
58 {LSL_TYPECAST_OPEN, ST_NONE, "(", LSL_RIGHT2LEFT | LSL_UNARY, NULL, evaluateOperationToken}, 73 {LSL_TYPECAST_OPEN, ST_NONE, "(", LSL_RIGHT2LEFT | LSL_UNARY, NULL, evaluateOperationToken},
59 {LSL_ANGLE_CLOSE, ST_NONE, ">", LSL_LEFT2RIGHT | LSL_CREATION, NULL, evaluateNoToken}, 74 {LSL_ANGLE_CLOSE, ST_NONE, ">", LSL_LEFT2RIGHT | LSL_CREATION, NULL, evaluateNoToken},