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Two for-loop variants are supported: a C-style counting for loop
consisting of an initialization expression, a test condition
and a step expression and a for-in-loop variant which allows
enumerating properties of objects or items of arrays.
Additionally, ucode supports an alternative syntax suitable for
template block tags.
-- Expect stdout --
A simple counting for-loop:
Iteration 0
Iteration 1
Iteration 2
Iteration 3
Iteration 4
Iteration 5
Iteration 6
Iteration 7
Iteration 8
Iteration 9
If the loop body consists of only one statement, the curly braces
may be omitted:
Iteration 0
Iteration 1
Iteration 2
Iteration 3
Iteration 4
Iteration 5
Iteration 6
Iteration 7
Iteration 8
Iteration 9
Any of the init-, test- and increment expressions may be omitted.
Loop without initialization statement:
Iteration null
Iteration 1
Iteration 2
Loop without test statement:
Iteration 0
Iteration 1
Iteration 2
Loop without init-, test- or increment statement:
Iteration 1
Iteration 2
Iteration 3
For-in loop enumerating object properties:
Key: foo
Key: bar
For-in loop enumerating array items:
Item: one
Item: two
Item: three
A counting for-loop using the alternative syntax:
Iteration 0
Iteration 1
Iteration 2
Iteration 3
Iteration 4
Iteration 5
Iteration 6
Iteration 7
Iteration 8
Iteration 9
A for-in loop using the alternative syntax:
Item 123
Item 456
Item 789
For-in and counting for loops may declare variables:
Iteration 0
Iteration 1
Iteration 2
Item 123
Item 456
Item 789
-- End --
-- Testcase --
A simple counting for-loop:
{%
for (i = 0; i < 10; i++) {
print("Iteration ");
print(i);
print("\n");
}
%}
If the loop body consists of only one statement, the curly braces
may be omitted:
{%
for (i = 0; i < 10; i++)
print("Iteration ", i, "\n");
%}
Any of the init-, test- and increment expressions may be omitted.
Loop without initialization statement:
{%
for (; j < 3; j++)
print("Iteration " + j + "\n");
%}
Loop without test statement:
{%
for (j = 0;; j++) {
if (j == 3)
break;
print("Iteration ", j, "\n");
}
%}
Loop without init-, test- or increment statement:
{%
for (;;) {
if (k++ == 3)
break;
print("Iteration ", k, "\n");
}
%}
For-in loop enumerating object properties:
{%
obj = { foo: true, bar: false };
for (key in obj)
print("Key: ", key, "\n");
%}
For-in loop enumerating array items:
{%
arr = [ "one", "two", "three" ];
for (item in arr)
print("Item: ", item, "\n");
%}
A counting for-loop using the alternative syntax:
{% for (x = 0; x < 10; x++): -%}
Iteration {{ x }}
{% endfor %}
A for-in loop using the alternative syntax:
{% for (n in [123, 456, 789]): -%}
Item {{ n }}
{% endfor %}
For-in and counting for loops may declare variables:
{% for (let i = 0; i < 3; i++): %}
Iteration {{ i }}
{% endfor %}
{% for (let n in [123, 456, 789]): %}
Item {{ n }}
{% endfor %}
-- End --
By specifying two loop variables in for-in loop expressions, keys
and values can be iterated simultaneously.
-- Expect stdout --
true
false
123
456
[ 0, true ]
[ 1, false ]
[ 2, 123 ]
[ 3, 456 ]
foo
bar
baz
qrx
[ "foo", true ]
[ "bar", false ]
[ "baz", 123 ]
[ "qrx", 456 ]
-- End --
-- Testcase --
{%
let arr = [ true, false, 123, 456 ];
let obj = { foo: true, bar: false, baz: 123, qrx: 456 };
// iterating arrays with one loop variable yields the array values
for (let x in arr)
print(x, "\n");
// iterating arrays with two loop variables yields the array indexes
// and their corresponding values
for (let x, y in arr)
print([x, y], "\n");
// iterating objects with one loop variable yields the object keys
for (let x in obj)
print(x, "\n");
// iterating objects with two loop variables yields the object keys
// and their corresponding values
for (let x, y in obj)
print([x, y], "\n");
%}
-- End --
Ensure that for-in loop expressions with more than two variables are
rejected.
-- Expect stderr --
Syntax error: Unexpected token
Expecting ';'
In line 2, byte 19:
` for (let x, y, z in {})`
Near here -----------^
-- End --
-- Testcase --
{%
for (let x, y, z in {})
;
%}
-- End --
Ensure that assignments in for-in loop expressions are rejected.
-- Expect stderr --
Syntax error: Unexpected token
Expecting ';'
In line 2, byte 20:
` for (let x = 1, y in {})`
Near here ------------^
-- End --
-- Testcase --
{%
for (let x = 1, y in {})
;
%}
-- End --
Ensure that too short for-in loop expressions are rejected (1/2).
-- Expect stderr --
Syntax error: Unexpected token
Expecting ';'
In line 2, byte 12:
` for (let x)`
Near here ----^
-- End --
-- Testcase --
{%
for (let x)
;
%}
-- End --
Ensure that too short for-in loop expressions are rejected (2/2).
-- Expect stderr --
Syntax error: Unexpected token
Expecting ';'
In line 2, byte 15:
` for (let x, y)`
Near here -------^
-- End --
-- Testcase --
{%
for (let x, y)
;
%}
-- End --
|
