I'm trying to generate some code with a xtend function , that function uses foor loop that with variable that its increemented , the problem is that that the value of the variable is shown on the generated file, how I can avoid it?
def codeGenerate(users u) '''
«var index = 0»
«FOR user :u»
«index +=1» //The problem is here the value of index is printed, how I can incremet the value without printing it?
«ENDFOR»
'''
It's not nice but this should do the trick:
«{index +=1; null}»
Related
I have a PostgreSQL table that stores some information in a JSON column, I'd like to take the data from this JSON column and populate a secondary table in the BIRT report.
I've got the data into a JSON object just fine, I can use it, but table #2 won't populate any data even though there is data in the JSON object.
DataSource1 it attached to DataSet1 which is PostgreSQL. DataSource2 is a scripted DS, and it has Dataset2 attached to it with columns defined.
In dataset1 I have the OnFetch function making my JSON array:
vars["invoiceData"] = JSON.parse(row["i_invoice"]);
Then I have in dataset2 (json dataset) I have this for the fetch event setup:
// Get the length of the object
len = vars["invoiceData"].labor.length;
count = 0;// Counter used to step through each item in the JSON object.
// Loop through the JSON object adding it to the scripted data source
if(count < len && len != 0) {
row["hrs"] = vars["invoiceData"].labor[count].hrs;
row["desc"] = vars["invoiceData"].labor[count].desc;
row["rate"] = vars["invoiceData"].labor[count].rate;
row["amount"] = vars["invoiceData"].labor[count].amount;
count++;
return true;
}
return false;
If I echo out the length of my array it has one row in it, but that table never comes back with anything, always empty on my report.
You are mixing initialization code with loop code.
Just think about this fragment:
count = 0;
if (...) {
count++;
return true;
}
return false;
You need to split and modify this code. Basically, for a scripted data set you need three things:
A counter variable (or something similar). This is best declared as a report variable.
Initialization of the counter variable in the data set's open event.
Using the counter variable in the data set's fetch event, eg modifying it and comparing it to the data length.
Your code will return the first data row in an endless loop, because what BIRT does is:
open()
while fetch():
emit the current row
Thus, your code is definitely wrong.
OTOH the behavior that you describe doesn't match what I would expect: A never-ending report. So there are probably other errors in your report. What does the "problems" view in the BIRT designer show?
I've been learning lua and can't seem to make a simple implementation of this binary tree work...
function createTree(tree, max)
if max > 0 then
tree = {data = max, left = {}, right = {}}
createTree(tree.left, max - 1)
createTree(tree.right, max - 1)
end
end
function printTree(tree)
if tree then
print(tree.data)
printTree(tree.left)
printTree(tree.right)
end
end
tree = {}
createTree(tree, 3)
printTree(tree)
the program just returns nil after execution. I've searched around the web to understand how argument passing works in lua (if it is by reference or by value) and found out that some types are passed by reference (like tables and functions) while others by value. Still, I made the global variable "tree" a table before passing it to the "createTree" function, and I even initialized "left" and "right" to be empty tables inside of "createTree" for the same purpose. What am I doing wrong?
It is probably necessary to initialize not by a new table, but only to set its values.
function createTree(tree, max)
if max > 0 then
tree.data = max
tree.left = {}
tree.right = {}
createTree(tree.left, max - 1)
createTree(tree.right, max - 1)
end
end
in Lua, arguments are passed by value. Assigning to an argument does not change the original variable.
Try this:
function createTree(max)
if max == 0 then
return nil
else
return {data = max, left = createTree(max-1), right = createTree(max-1)}
end
end
It is safe to think that for the most of the cases lua passes arguments by value. But for any object other than a number (numbers aren't objects actually), the "value" is actually a pointer to the said object.
When you do something like a={1,2,3} or b="asda" the values on the right are allocated somewhere dynamically, and a and b only get addresses of those. Thus, when you pass a to the function fun(a), the pointer is copied to a new variable inside function, but the a itself is unaffected:
function fun(p)
--p stores address of the same object, but `p` is not `a`
p[1]=3--by using the address you can
p[4]=1--alter the contents of the object
p[2]=nil--this will be seen outside
q={}
p={}--here you assign address of another object to the pointer
p=q--(here too)
end
Functions are also represented by pointers to them, you can use debug library to tinker with function object (change upvalues for example), this may affect how function executes, but, once again, you can not change where external references are pointing.
Strings are immutable objects, you can pass them around, there is a library that does stuff to them, but all the functions in that library return new string. So once, again external variable b from b="asda" would not be affected if you tried to do something with "asda" string inside the function.
If I do something wrong with the formatting or anything else, sorry, I don't use this site often.
I'm trying to make a function in lua that with take a name I give it, and create a subtable with that name, and when I tried something like this it just made the absolute name I put in the function's code.
NewSubtable =
function(SubtableName)
Table.SubtableName = {} --Creates a subtable called SubtableName
end
How can I make this create a subtable that is called by the name I give in the function when I use it? Is there an indicator or something to let the code know not to use the name given, but to use the variable assigned when I use the function?
EDIT: So whenever I try this, I get the the result "table index is nil" and it points to the error on line 4
I went and tested this but with a different input type, and it was just my fault. I didn't think that strings would the the value type you'd need for what I'm doing. My problem is solved.
Complete code:
Items = {}
NewWeapon = function(id, name, desc, minDMG, maxDMG)
Items[id] = {}
Items[id].Name = name
Items[id].Desc = desc
Items[id].MinDMG = minDMG
Items[id].MaxDMG = maxDMG
end
NewWeapon(Test, "test", "test", 1, 1)
Table.SubtableName is actually a syntactic sugar for Table['SubtableName']. To use the contents of variable SubtableName use the idom Table[SubtableName].
I am making a terminal emulator in Python 3. The commands are being stored in functions, like:
def rd(os_vartmp, os_vartmp2):
if os_vartmp == None:
print('rd [path] [-S]')
print('Delete a folder')
else:
if os.path.isfile(os_vartmp) == True:
if os_vartmp2 == '-S': print('a')
else:
print(ERR5)
a = input('Command: ')
The terminal works like this:
Asks user for input
Splits the input
Uses the first part of input to search a function in locals
If there is one, uses the rest part of input as argument
Calls the function
The thing here is, when i call the function 'rd' with, for example, 'rd "boot.py" -S' it works just fine. But if i need to call it like this: rd "boot.py", it throws me a error about 1 argument given when 2 are required. Is there a fix for that?
You can make an argument optional by assigning a value in the method definition. For example:
def Add(x=0, y=0):
return x+y
If you input only one value, y will default to 0. If I wanted to give y a value but have x fall back on it's default value I could do Add(y=10). I hope this helped!
Have you tried this?
def rd(os_vartmp, os_vartmp2="-S"):
Instead of trying to get null value, which would require rd("boot.py",null), you can ser default value and then you can do rd("boot.py").
Hope it works.
I'm working with lua-alchemy, and I'm setting a global variable in my AS3 code in this way:
_lua.setGlobal("map", _map);
With _map being a object with the following function in it:
public function get x():int
{
return 10;
}
if then I try to do something like this in Lua
local a = map.x + 1
I get the following error:
Lua script failed: luaDoString:21: attempt to perform arithmetic on field 'x' (a table value)
Does anyone knows why it does that, and how I could fix it?
EDIT :
When I print type(map.id), it prints table... Shouldn't it print number?
I found my error. According to this page, I have to use as3.tolua(map.x) to convert it to the right type.