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fix: improve parsing of `:nth-of-type(xn+b)` (#9970)

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closes #9969

this also fixes the following along the way:
the + in nth-of-type(+xn-b) would be parsed as a combinator.

invalid cases like these are not allowed anymore:

b(+/-)b
-ax
-ax-b
-b
pull/10056/head
navorite 11 months ago committed by GitHub
parent 1e33ed5bb9
commit 6d65b2f8ad
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
4 changed files with 298 additions and 19 deletions
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5
.changeset/three-suits-grin.md
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@ -0,0 +1,5 @@
---
'svelte': patch
---
fix: parse `:nth-of-type(xn+y)` correctly

18
packages/svelte/src/compiler/phases/1-parse/read/style.js
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@ -6,7 +6,8 @@ const REGEX_ATTRIBUTE_FLAGS = /^[a-zA-Z]+/; // only `i` and `s` are valid today,
const REGEX_COMBINATOR_WHITESPACE = /^\s*(\+|~|>|\|\|)\s*/;
const REGEX_COMBINATOR = /^(\+|~|>|\|\|)/;
const REGEX_PERCENTAGE = /^\d+(\.\d+)?%/;
const REGEX_NTH_OF = /^\s*(even|odd|(-?[0-9]?n?(\s*\+\s*[0-9]+)?))(\s*(?=[,)])|\s+of\s+)/;
const REGEX_NTH_OF =
/^\s*(even|odd|\+?(\d+|\d*n(\s*[+-]\s*\d+)?)|-\d*n(\s*\+\s*\d+))(\s*(?=[,)])|\s+of\s+)/;
const REGEX_WHITESPACE_OR_COLON = /[\s:]/;
const REGEX_BRACE_OR_SEMICOLON = /[{;]/;
const REGEX_LEADING_HYPHEN_OR_DIGIT = /-?\d/;
@ -277,6 +278,14 @@ function read_selector(parser, inside_pseudo_class = false) {
value,
flags
});
} else if (inside_pseudo_class && parser.match_regex(REGEX_NTH_OF)) {
// nth of matcher must come before combinator matcher to prevent collision else the '+' in '+2n-1' would be parsed as a combinator
children.push({
type: 'Nth',
value: /** @type {string} */ (parser.read(REGEX_NTH_OF)),
start,
end: parser.index
});
} else if (parser.match_regex(REGEX_COMBINATOR_WHITESPACE)) {
parser.allow_whitespace();
const start = parser.index;
@ -294,13 +303,6 @@ function read_selector(parser, inside_pseudo_class = false) {
start,
end: parser.index
});
} else if (inside_pseudo_class && parser.match_regex(REGEX_NTH_OF)) {
children.push({
type: 'Nth',
value: /** @type {string} */ (parser.read(REGEX_NTH_OF)),
start,
end: parser.index
});
} else {
let name = read_identifier(parser);
if (parser.match('|')) {

12
packages/svelte/tests/parser-modern/samples/css-nth-syntax/input.svelte
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@ -28,6 +28,18 @@
}
h1:global(nav) {
background: red;
}
h1:nth-of-type(10n+1){
background: red;
}
h1:nth-of-type(-2n+3){
background: red;
}
h1:nth-of-type(+12){
background: red;
}
h1:nth-of-type(+3n){
background: red;
}
</style>

282
packages/svelte/tests/parser-modern/samples/css-nth-syntax/output.json
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@ -2,7 +2,7 @@
"css": {
"type": "Style",
"start": 0,
"end": 586,
"end": 806,
"attributes": [],
"children": [
{
@ -601,32 +601,292 @@
},
"start": 530,
"end": 577
},
{
"type": "Rule",
"prelude": {
"type": "SelectorList",
"start": 580,
"end": 601,
"children": [
{
"type": "Selector",
"start": 580,
"end": 601,
"children": [
{
"type": "TypeSelector",
"name": "h1",
"start": 580,
"end": 582
},
{
"type": "PseudoClassSelector",
"name": "nth-of-type",
"args": {
"type": "SelectorList",
"start": 595,
"end": 600,
"children": [
{
"type": "Selector",
"start": 595,
"end": 600,
"children": [
{
"type": "Nth",
"value": "10n+1",
"start": 595,
"end": 600
}
]
}
]
},
"start": 582,
"end": 601
}
]
}
]
},
"block": {
"type": "Block",
"start": 601,
"end": 633,
"children": [
{
"type": "Declaration",
"start": 611,
"end": 626,
"property": "background",
"value": "red"
}
]
},
"start": 580,
"end": 633
},
{
"type": "Rule",
"prelude": {
"type": "SelectorList",
"start": 636,
"end": 657,
"children": [
{
"type": "Selector",
"start": 636,
"end": 657,
"children": [
{
"type": "TypeSelector",
"name": "h1",
"start": 636,
"end": 638
},
{
"type": "PseudoClassSelector",
"name": "nth-of-type",
"args": {
"type": "SelectorList",
"start": 651,
"end": 656,
"children": [
{
"type": "Selector",
"start": 651,
"end": 656,
"children": [
{
"type": "Nth",
"value": "-2n+3",
"start": 651,
"end": 656
}
]
}
]
},
"start": 638,
"end": 657
}
]
}
]
},
"block": {
"type": "Block",
"start": 657,
"end": 689,
"children": [
{
"type": "Declaration",
"start": 667,
"end": 682,
"property": "background",
"value": "red"
}
]
},
"start": 636,
"end": 689
},
{
"type": "Rule",
"prelude": {
"type": "SelectorList",
"start": 692,
"end": 711,
"children": [
{
"type": "Selector",
"start": 692,
"end": 711,
"children": [
{
"type": "TypeSelector",
"name": "h1",
"start": 692,
"end": 694
},
{
"type": "PseudoClassSelector",
"name": "nth-of-type",
"args": {
"type": "SelectorList",
"start": 707,
"end": 710,
"children": [
{
"type": "Selector",
"start": 707,
"end": 710,
"children": [
{
"type": "Nth",
"value": "+12",
"start": 707,
"end": 710
}
]
}
]
},
"start": 694,
"end": 711
}
]
}
]
},
"block": {
"type": "Block",
"start": 711,
"end": 743,
"children": [
{
"type": "Declaration",
"start": 721,
"end": 736,
"property": "background",
"value": "red"
}
]
},
"start": 692,
"end": 743
},
{
"type": "Rule",
"prelude": {
"type": "SelectorList",
"start": 746,
"end": 765,
"children": [
{
"type": "Selector",
"start": 746,
"end": 765,
"children": [
{
"type": "TypeSelector",
"name": "h1",
"start": 746,
"end": 748
},
{
"type": "PseudoClassSelector",
"name": "nth-of-type",
"args": {
"type": "SelectorList",
"start": 761,
"end": 764,
"children": [
{
"type": "Selector",
"start": 761,
"end": 764,
"children": [
{
"type": "Nth",
"value": "+3n",
"start": 761,
"end": 764
}
]
}
]
},
"start": 748,
"end": 765
}
]
}
]
},
"block": {
"type": "Block",
"start": 765,
"end": 797,
"children": [
{
"type": "Declaration",
"start": 775,
"end": 790,
"property": "background",
"value": "red"
}
]
},
"start": 746,
"end": 797
}
],
"content": {
"start": 7,
"end": 578,
"styles": "\n /* test that all these are parsed correctly */\n\th1:nth-of-type(2n+1){\n background: red;\n }\n h1:nth-child(-n + 3 of li.important) {\n background: red;\n }\n h1:nth-child(1) {\n background: red;\n }\n h1:nth-child(p) {\n background: red;\n }\n h1:nth-child(n+7) {\n background: red;\n }\n h1:nth-child(even) {\n background: red;\n }\n h1:nth-child(odd) {\n background: red;\n }\n h1:nth-child(\n n\n ) {\n background: red;\n }\n h1:global(nav) {\n background: red;\n }\n"
"end": 798,
"styles": "\n /* test that all these are parsed correctly */\n\th1:nth-of-type(2n+1){\n background: red;\n }\n h1:nth-child(-n + 3 of li.important) {\n background: red;\n }\n h1:nth-child(1) {\n background: red;\n }\n h1:nth-child(p) {\n background: red;\n }\n h1:nth-child(n+7) {\n background: red;\n }\n h1:nth-child(even) {\n background: red;\n }\n h1:nth-child(odd) {\n background: red;\n }\n h1:nth-child(\n n\n ) {\n background: red;\n }\n h1:global(nav) {\n background: red;\n }\n\t\th1:nth-of-type(10n+1){\n background: red;\n }\n\t\th1:nth-of-type(-2n+3){\n background: red;\n }\n\t\th1:nth-of-type(+12){\n background: red;\n }\n\t\th1:nth-of-type(+3n){\n background: red;\n }\n"
}
},
"js": [],
"start": 588,
"end": 600,
"start": 808,
"end": 820,
"type": "Root",
"fragment": {
"type": "Fragment",
"nodes": [
{
"type": "Text",
"start": 586,
"end": 588,
"start": 806,
"end": 808,
"raw": "\n\n",
"data": "\n\n"
},
{
"type": "RegularElement",
"start": 588,
"end": 600,
"start": 808,
"end": 820,
"name": "h1",
"attributes": [],
"fragment": {
@ -634,8 +894,8 @@
"nodes": [
{
"type": "Text",
"start": 592,
"end": 595,
"start": 812,
"end": 815,
"raw": "Foo",
"data": "Foo"
}

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