Test statements

List

There is the list of test keywords in Nougaro :

Nougaro	Python
if	if
then	:
elif	elif
else	else
assert	assert

Syntax

• if <cond> then <expr>
• if <cond> then <expr> else <expr>
• if <cond> then <expr> elif <cond> then <expr>
• if <cond> then <expr> elif <cond> then <expr> else <expr>
• if <cond> then <expr> elif <cond> then <expr> elif <cond> then <expr>
• if <cond> then <expr> elif <cond> then <expr> elif <cond> then <expr> else <expr>

etc.

Multi-line :

if <cond> then
    <some code here>
end

if <cond> then
    <some code here>
else
    <some other code>
end

if <cond> then
    <some code here>
else
    <some other code>
end

etc.

Behaviour

The condition is checked. If it is true, the expression in the if branch is executed. Otherwise, Nougaro checks for an elif branch. If it exists, it re-checks the condition, etc. If none of the conditions is true and that there is an else branch, the expression in the else branch is executed. If there is no else branch, nothing is executed.

Logicals constants

Nougaro	Python	Comments
True	True	equals to 1
False	False	equals to 0

Conditions

Conditions can be any value, which will be interpreted in its boolean context.

Conditions can also use test operators. For instance, a == b checks if a is equal to b, where a < b checks if a is strictly less than b. You can chain multiple operators: a == b <= c != d checks if a is equal to b and if b is less than or equal to c and if c is different from d.

Multiple conditions can be combined with boolean/logical operators. Here is the truth table of the logical operators:

and

a	b	a and b
0	0	0
0	1	0
1	0	0
1	1	1

or

a	b	a or b
0	0	0
0	1	1
1	0	1
1	1	1

xor

a	b	a xor b
0	0	0
0	1	1
1	0	1
1	1	0

not

a	not a
0	1
1	0

There is no priority amongst boolean operators, so for instance a and b or c xor d gives ((a and b) or c) xor d.

After interpretation, a condition is always 0 or 1 (False or True).

Examples

• if foo == bar then var foo = 12
• if bar != foo then var foo = 12 else var bar = 13 *

if foo > bar and 12 <= variable then
    var bar = variable
elif foo < bar xor foo > variable then
    var foo = 3
end

if foo > bar and 12 <= variable then
    var bar = variable
elif foo < bar xor foo > variable then
    var foo = 3
else
    var foo = 12
end

Assertions

The assert keyword can be used to quickly check for a condition, and crash if the condition is not met. Its syntax is the following:

assert (condition)
assert (condition), "error message."

If (condition) is true, nothing happens and the program continues. However, if it is false, the program crashes with AssertionError with the error message specified in the code (or without any error message if no error message is specified.)