Comments (4)
For reference:
func decorateStringLib(L *lua.LState) {
strlib := L.GetGlobal("string")
if strlib, ok := strlib.(*lua.LTable); ok {
index := strlib.RawGetString("__index")
if index, ok := index.(*lua.LTable); ok {
index.RawSetString("upper", L.NewClosure(upper))
}
}
}
func upper(L *lua.LState) int {
str := L.CheckString(1)
str = strings.ToUpper(str)
L.Push(lua.LString(str))
return 1
}
In Lua:
str = "banana"
str:upper()
from gopher-lua.
To answer my entire question
func decorateStringLib(L *lua.LState) {
strlib := L.GetGlobal("string")
if strlib, ok := strlib.(*lua.LTable); ok {
index := strlib.RawGetString("__index")
if index, ok := index.(*lua.LTable); ok {
index.RawSetString("split", L.NewClosure(split))
}
}
}
func split(L *lua.LState) int {
s := L.CheckString(1)
sep := L.CheckString(2)
parts := strings.Split(s, sep)
if L.GetTop() == 3 {
fn := L.CheckFunction(3)
p := lua.P{Fn: fn, NRet: 0, Protect: true}
for i, str := range parts {
if err := L.CallByParam(p, lua.LString(str), lua.LNumber(i)); err != nil {
emitFatal("%v", err)
}
}
}
i := 0
iterator := func(L *lua.LState) int {
if i == len(parts) {
return 0
}
L.Push(lua.LString(parts[i]))
L.Push(lua.LNumber(i))
i++
return 2
}
L.Push(L.NewClosure(iterator))
return 1
}
Can be called in Lua by:
out = "first\nsecond"
for line in out:split("\n") do
print("i", line)
end
out:split("\n", function(line)
print("cb", line)
end)
from gopher-lua.
Or you can do like this:
local mt = getmetatable('')
function mt:print()
print(self)
end
x = 'hello'
x:print()
from gopher-lua.
Thanks! Using GetMetatable
made the implementation in Go much simpler
mt := L.GetMetatable(lua.LString("")).(*lua.LTable)
mt.RawSetString("split", L.NewClosure(split))
from gopher-lua.
Related Issues (20)
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from gopher-lua.