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<!doctype html>
<title>An+B Parsing</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
foo { color: blue; }
</style>
<meta name="author" title="Tab Atkins-Bittner">
<link rel=help href="https://drafts.csswg.org/css-syntax/#the-anb-type">
<script>
function roundtripANB(str) {
const rule = document.styleSheets[0].cssRules[0];
rule.selectorText = "foo";
rule.selectorText = `:nth-child(${str})`;
// Check for parse error.
if(rule.selectorText == "foo") return "parse error";
return rule.selectorText.slice(11, -1);
}
function testANB(input, expected) {
test(()=>{
assert_equals(roundtripANB(input), expected);
}, `"${input}" becomes "${expected}"`);
}
/* Just going down all the syntax clauses one-by-one */
// odd | even |
testANB("odd", "2n+1");
testANB("even", "2n");
// <integer> |
testANB("1", "1");
testANB("+1", "1");
testANB("-1", "-1");
//
// <n-dimension> |
testANB("5n", "5n");
testANB("5N", "5n");
// '+'?† n |
testANB("+n", "n");
testANB("n", "n");
testANB("N", "n");
testANB("+ n", "parse error");
// -n |
testANB("-n", "-n");
testANB("-N", "-n");
//
// <ndashdigit-dimension> |
testANB("5n-5", "5n-5");
// '+'?† <ndashdigit-ident> |
testANB("+n-5", "n-5");
testANB("n-5", "n-5");
testANB("+ n-5", "parse error");
// <dashndashdigit-ident> |
testANB("-n-5", "-n-5");
//
// <n-dimension> <signed-integer> |
testANB("5n +5", "5n+5");
testANB("5n -5", "5n-5");
// '+'?† n <signed-integer> |
testANB("+n +5", "n+5");
testANB("n +5", "n+5");
testANB("+n -5", "n-5");
testANB("+ n +5", "parse error");
testANB("n 5", "parse error");
// -n <signed-integer> |
testANB("-n +5", "-n+5");
testANB("-n -5", "-n-5");
testANB("-n 5", "parse error");
//
// <ndash-dimension> <signless-integer> |
testANB("5n- 5", "5n-5");
testANB("5n- -5", "parse error");
testANB("5n- +5", "parse error");
testANB("-5n- 5", "-5n-5");
// '+'?† n- <signless-integer> |
testANB("+n- 5", "n-5");
testANB("n- 5", "n-5");
testANB("+ n- 5", "parse error");
testANB("n- +5", "parse error");
testANB("n- -5", "parse error");
// -n- <signless-integer> |
testANB("-n- 5", "-n-5");
testANB("-n- +5", "parse error");
testANB("-n- -5", "parse error");
//
// <n-dimension> ['+' | '-'] <signless-integer>
testANB("5n + 5", "5n+5");
testANB("5n - 5", "5n-5");
testANB("5n + +5", "parse error");
testANB("5n + -5", "parse error");
testANB("5n - +5", "parse error");
testANB("5n - -5", "parse error");
// '+'?† n ['+' | '-'] <signless-integer> |
testANB("+n + 5", "n+5");
testANB("n + 5", "n+5");
testANB("+ n + 5", "parse error");
testANB("+n - 5", "n-5");
testANB("+n + +5", "parse error");
testANB("+n + -5", "parse error");
testANB("+n - +5", "parse error");
testANB("+n - -5", "parse error");
// -n ['+' | '-'] <signless-integer>
testANB("-n + 5", "-n+5");
testANB("-n - 5", "-n-5");
testANB("-n + +5", "parse error");
testANB("-n + -5", "parse error");
testANB("-n - +5", "parse error");
testANB("-n - -5", "parse error");
/* Swapped ordering is invalid */
testANB("1 - n", "parse error");
testANB("0 - n", "parse error");
testANB("-1 + n", "parse error");
/* Odd space usage */
testANB("2 n + 2", "parse error");
testANB("- 2n", "parse error");
testANB("+ 2n", "parse error");
testANB("+2 n", "parse error");
</script>
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