File: /var/www/quadcode.com/node_modules/svelte/src/compiler/compile/css/Selector.js
import { gather_possible_values, UNKNOWN } from './gather_possible_values.js';
import compiler_errors from '../compiler_errors.js';
import { regex_starts_with_whitespace, regex_ends_with_whitespace } from '../../utils/patterns.js';
const BlockAppliesToNode = /** @type {const} */ ({
NotPossible: 0,
Possible: 1,
UnknownSelectorType: 2
});
const NodeExist = /** @type {const} */ ({
Probably: 0,
Definitely: 1
});
/** @typedef {typeof NodeExist[keyof typeof NodeExist]} NodeExistsValue */
const whitelist_attribute_selector = new Map([
['details', new Set(['open'])],
['dialog', new Set(['open'])]
]);
const regex_is_single_css_selector = /[^\\],(?!([^([]+[^\\]|[^([\\])[)\]])/;
export default class Selector {
/** @type {import('./private.js').CssNode} */
node;
/** @type {import('./Stylesheet.js').default} */
stylesheet;
/** @type {Block[]} */
blocks;
/** @type {Block[]} */
local_blocks;
/** @type {boolean} */
used;
/**
* @param {import('./private.js').CssNode} node
* @param {import('./Stylesheet.js').default} stylesheet
*/
constructor(node, stylesheet) {
this.node = node;
this.stylesheet = stylesheet;
this.blocks = group_selectors(node);
// take trailing :global(...) selectors out of consideration
let i = this.blocks.length;
while (i > 0) {
if (!this.blocks[i - 1].global) break;
i -= 1;
}
this.local_blocks = this.blocks.slice(0, i);
const host_only = this.blocks.length === 1 && this.blocks[0].host;
const root_only = this.blocks.length === 1 && this.blocks[0].root;
this.used = this.local_blocks.length === 0 || host_only || root_only;
}
/** @param {import('../nodes/Element.js').default} node */
apply(node) {
/** @type {Array<{ node: import('../nodes/Element.js').default; block: Block }>} */
const to_encapsulate = [];
apply_selector(this.local_blocks.slice(), node, to_encapsulate);
if (to_encapsulate.length > 0) {
to_encapsulate.forEach(({ node, block }) => {
this.stylesheet.nodes_with_css_class.add(node);
block.should_encapsulate = true;
});
this.used = true;
}
}
/** @param {import('magic-string').default} code */
minify(code) {
/** @type {number} */
let c = null;
this.blocks.forEach((block, i) => {
if (i > 0) {
if (block.start - c > 1) {
code.update(c, block.start, block.combinator.name || ' ');
}
}
c = block.end;
});
}
/**
* @param {import('magic-string').default} code
* @param {string} attr
* @param {number} max_amount_class_specificity_increased
*/
transform(code, attr, max_amount_class_specificity_increased) {
const amount_class_specificity_to_increase =
max_amount_class_specificity_increased -
this.blocks.filter((block) => block.should_encapsulate).length;
/** @param {import('./private.js').CssNode} selector */
function remove_global_pseudo_class(selector) {
const first = selector.children[0];
const last = selector.children[selector.children.length - 1];
code.remove(selector.start, first.start).remove(last.end, selector.end);
}
/**
* @param {Block} block
* @param {string} attr
*/
function encapsulate_block(block, attr) {
for (const selector of block.selectors) {
if (selector.type === 'PseudoClassSelector' && selector.name === 'global') {
remove_global_pseudo_class(selector);
}
}
let i = block.selectors.length;
while (i--) {
const selector = block.selectors[i];
if (selector.type === 'PseudoElementSelector' || selector.type === 'PseudoClassSelector') {
if (selector.name !== 'root' && selector.name !== 'host') {
if (i === 0) code.prependRight(selector.start, attr);
}
continue;
}
if (selector.type === 'TypeSelector' && selector.name === '*') {
code.update(selector.start, selector.end, attr);
} else {
code.appendLeft(selector.end, attr);
}
break;
}
}
this.blocks.forEach((block, index) => {
if (block.global) {
remove_global_pseudo_class(block.selectors[0]);
}
if (block.should_encapsulate)
encapsulate_block(
block,
index === this.blocks.length - 1
? attr.repeat(amount_class_specificity_to_increase + 1)
: attr
);
});
}
/** @param {import('../Component.js').default} component */
validate(component) {
let start = 0;
let end = this.blocks.length;
for (; start < end; start += 1) {
if (!this.blocks[start].global) break;
}
for (; end > start; end -= 1) {
if (!this.blocks[end - 1].global) break;
}
for (let i = start; i < end; i += 1) {
if (this.blocks[i].global) {
return component.error(this.blocks[i].selectors[0], compiler_errors.css_invalid_global);
}
}
this.validate_global_with_multiple_selectors(component);
this.validate_global_compound_selector(component);
this.validate_invalid_combinator_without_selector(component);
}
/** @param {import('../Component.js').default} component */
validate_global_with_multiple_selectors(component) {
if (this.blocks.length === 1 && this.blocks[0].selectors.length === 1) {
// standalone :global() with multiple selectors is OK
return;
}
for (const block of this.blocks) {
for (const selector of block.selectors) {
if (selector.type === 'PseudoClassSelector' && selector.name === 'global') {
if (regex_is_single_css_selector.test(selector.children[0].value)) {
component.error(selector, compiler_errors.css_invalid_global_selector);
}
}
}
}
}
/** @param {import('../Component.js').default} component */
validate_invalid_combinator_without_selector(component) {
for (let i = 0; i < this.blocks.length; i++) {
const block = this.blocks[i];
if (block.combinator && block.selectors.length === 0) {
component.error(
this.node,
compiler_errors.css_invalid_selector(
component.source.slice(this.node.start, this.node.end)
)
);
}
if (!block.combinator && block.selectors.length === 0) {
component.error(
this.node,
compiler_errors.css_invalid_selector(
component.source.slice(this.node.start, this.node.end)
)
);
}
}
}
/** @param {import('../Component.js').default} component */
validate_global_compound_selector(component) {
for (const block of this.blocks) {
for (let index = 0; index < block.selectors.length; index++) {
const selector = block.selectors[index];
if (
selector.type === 'PseudoClassSelector' &&
selector.name === 'global' &&
index !== 0 &&
selector.children &&
selector.children.length > 0 &&
!/[.:#\s]/.test(selector.children[0].value[0])
) {
component.error(selector, compiler_errors.css_invalid_global_selector_position);
}
}
}
}
get_amount_class_specificity_increased() {
let count = 0;
for (const block of this.blocks) {
if (block.should_encapsulate) {
count++;
}
}
return count;
}
}
/**
* @param {Block[]} blocks
* @param {import('../nodes/Element.js').default} node
* @param {Array<{ node: import('../nodes/Element.js').default; block: Block }>} to_encapsulate
* @returns {boolean}
*/
function apply_selector(blocks, node, to_encapsulate) {
const block = blocks.pop();
if (!block) return false;
if (!node) {
return (
(block.global && blocks.every((block) => block.global)) || (block.host && blocks.length === 0)
);
}
switch (block_might_apply_to_node(block, node)) {
case BlockAppliesToNode.NotPossible:
return false;
case BlockAppliesToNode.UnknownSelectorType:
// bail. TODO figure out what these could be
to_encapsulate.push({ node, block });
return true;
}
if (block.combinator) {
if (block.combinator.type === 'Combinator' && block.combinator.name === ' ') {
for (const ancestor_block of blocks) {
if (ancestor_block.global) {
continue;
}
if (ancestor_block.host) {
to_encapsulate.push({ node, block });
return true;
}
let parent = node;
while ((parent = get_element_parent(parent))) {
if (
block_might_apply_to_node(ancestor_block, parent) !== BlockAppliesToNode.NotPossible
) {
to_encapsulate.push({ node: parent, block: ancestor_block });
}
}
if (to_encapsulate.length) {
to_encapsulate.push({ node, block });
return true;
}
}
if (blocks.every((block) => block.global)) {
to_encapsulate.push({ node, block });
return true;
}
return false;
} else if (block.combinator.name === '>') {
const has_global_parent = blocks.every((block) => block.global);
if (has_global_parent || apply_selector(blocks, get_element_parent(node), to_encapsulate)) {
to_encapsulate.push({ node, block });
return true;
}
return false;
} else if (block.combinator.name === '+' || block.combinator.name === '~') {
const siblings = get_possible_element_siblings(node, block.combinator.name === '+');
let has_match = false;
// NOTE: if we have :global(), we couldn't figure out what is selected within `:global` due to the
// css-tree limitation that does not parse the inner selector of :global
// so unless we are sure there will be no sibling to match, we will consider it as matched
const has_global = blocks.some((block) => block.global);
if (has_global) {
if (siblings.size === 0 && get_element_parent(node) !== null) {
return false;
}
to_encapsulate.push({ node, block });
return true;
}
for (const possible_sibling of siblings.keys()) {
if (apply_selector(blocks.slice(), possible_sibling, to_encapsulate)) {
to_encapsulate.push({ node, block });
has_match = true;
}
}
return has_match;
}
// TODO other combinators
to_encapsulate.push({ node, block });
return true;
}
to_encapsulate.push({ node, block });
return true;
}
const regex_backslash_and_following_character = /\\(.)/g;
/**
* @param {Block} block
* @param {import('../nodes/Element.js').default} node
* @returns {typeof BlockAppliesToNode[keyof typeof BlockAppliesToNode]}
*/
function block_might_apply_to_node(block, node) {
let i = block.selectors.length;
while (i--) {
const selector = block.selectors[i];
const name =
typeof selector.name === 'string' &&
selector.name.replace(regex_backslash_and_following_character, '$1');
if (selector.type === 'PseudoClassSelector' && (name === 'host' || name === 'root')) {
return BlockAppliesToNode.NotPossible;
}
if (
block.selectors.length === 1 &&
selector.type === 'PseudoClassSelector' &&
name === 'global'
) {
return BlockAppliesToNode.NotPossible;
}
if (selector.type === 'PseudoClassSelector' || selector.type === 'PseudoElementSelector') {
continue;
}
if (selector.type === 'ClassSelector') {
if (
!attribute_matches(node, 'class', name, '~=', false) &&
!node.classes.some((c) => c.name === name)
)
return BlockAppliesToNode.NotPossible;
} else if (selector.type === 'IdSelector') {
if (!attribute_matches(node, 'id', name, '=', false)) return BlockAppliesToNode.NotPossible;
} else if (selector.type === 'AttributeSelector') {
if (
!(
whitelist_attribute_selector.has(node.name.toLowerCase()) &&
whitelist_attribute_selector
.get(node.name.toLowerCase())
.has(selector.name.name.toLowerCase())
) &&
!attribute_matches(
node,
selector.name.name,
selector.value && unquote(selector.value),
selector.matcher,
selector.flags
)
) {
return BlockAppliesToNode.NotPossible;
}
} else if (selector.type === 'TypeSelector') {
if (
node.name.toLowerCase() !== name.toLowerCase() &&
name !== '*' &&
!node.is_dynamic_element
)
return BlockAppliesToNode.NotPossible;
} else {
return BlockAppliesToNode.UnknownSelectorType;
}
}
return BlockAppliesToNode.Possible;
}
/**
* @param {any} operator
* @param {any} expected_value
* @param {any} case_insensitive
* @param {any} value
*/
function test_attribute(operator, expected_value, case_insensitive, value) {
if (case_insensitive) {
expected_value = expected_value.toLowerCase();
value = value.toLowerCase();
}
switch (operator) {
case '=':
return value === expected_value;
case '~=':
return value.split(/\s/).includes(expected_value);
case '|=':
return `${value}-`.startsWith(`${expected_value}-`);
case '^=':
return value.startsWith(expected_value);
case '$=':
return value.endsWith(expected_value);
case '*=':
return value.includes(expected_value);
default:
throw new Error("this shouldn't happen");
}
}
/**
* @param {import('./private.js').CssNode} node
* @param {string} name
* @param {string} expected_value
* @param {string} operator
* @param {boolean} case_insensitive
*/
function attribute_matches(node, name, expected_value, operator, case_insensitive) {
const spread = node.attributes.find((attr) => attr.type === 'Spread');
if (spread) return true;
if (node.bindings.some((binding) => binding.name === name)) return true;
const attr = node.attributes.find((attr) => attr.name === name);
if (!attr) return false;
if (attr.is_true) return operator === null;
if (expected_value == null) return true;
if (attr.chunks.length === 1) {
const value = attr.chunks[0];
if (!value) return false;
if (value.type === 'Text')
return test_attribute(operator, expected_value, case_insensitive, value.data);
}
const possible_values = new Set();
let prev_values = [];
for (const chunk of attr.chunks) {
const current_possible_values = new Set();
if (chunk.type === 'Text') {
current_possible_values.add(chunk.data);
} else {
gather_possible_values(chunk.node, current_possible_values);
}
// impossible to find out all combinations
if (current_possible_values.has(UNKNOWN)) return true;
if (prev_values.length > 0) {
const start_with_space = [];
const remaining = [];
current_possible_values.forEach((current_possible_value) => {
if (regex_starts_with_whitespace.test(current_possible_value)) {
start_with_space.push(current_possible_value);
} else {
remaining.push(current_possible_value);
}
});
if (remaining.length > 0) {
if (start_with_space.length > 0) {
prev_values.forEach((prev_value) => possible_values.add(prev_value));
}
const combined = [];
prev_values.forEach((prev_value) => {
remaining.forEach((value) => {
combined.push(prev_value + value);
});
});
prev_values = combined;
start_with_space.forEach((value) => {
if (regex_ends_with_whitespace.test(value)) {
possible_values.add(value);
} else {
prev_values.push(value);
}
});
continue;
} else {
prev_values.forEach((prev_value) => possible_values.add(prev_value));
prev_values = [];
}
}
current_possible_values.forEach((current_possible_value) => {
if (regex_ends_with_whitespace.test(current_possible_value)) {
possible_values.add(current_possible_value);
} else {
prev_values.push(current_possible_value);
}
});
if (prev_values.length < current_possible_values.size) {
prev_values.push(' ');
}
if (prev_values.length > 20) {
// might grow exponentially, bail out
return true;
}
}
prev_values.forEach((prev_value) => possible_values.add(prev_value));
if (possible_values.has(UNKNOWN)) return true;
for (const value of possible_values) {
if (test_attribute(operator, expected_value, case_insensitive, value)) return true;
}
return false;
}
/** @param {import('./private.js').CssNode} value */
function unquote(value) {
if (value.type === 'Identifier') return value.name;
const str = value.value;
if ((str[0] === str[str.length - 1] && str[0] === "'") || str[0] === '"') {
return str.slice(1, str.length - 1);
}
return str;
}
/**
* @param {import('../nodes/Element.js').default} node
* @returns {any}
*/
function get_element_parent(node) {
/** @type {import('../nodes/interfaces.js').INode} */
let parent = node;
while ((parent = parent.parent) && parent.type !== 'Element');
return /** @type {import('../nodes/Element.js').default | null} */ (parent);
}
/**
* Finds the given node's previous sibling in the DOM
*
* The Svelte <slot> is just a placeholder and is not actually real. Any children nodes
* in <slot> are 'flattened' and considered as the same level as the <slot>'s siblings
*
* e.g.
* <h1>Heading 1</h1>
* <slot>
* <h2>Heading 2</h2>
* </slot>
*
* is considered to look like:
* <h1>Heading 1</h1>
* <h2>Heading 2</h2>
* @param {import('../nodes/interfaces.js').INode} node
* @returns {import('../nodes/interfaces.js').INode}
*/
function find_previous_sibling(node) {
/** @type {import('../nodes/interfaces.js').INode} */
let current_node = node;
do {
if (current_node.type === 'Slot') {
const slot_children = current_node.children;
if (slot_children.length > 0) {
current_node = slot_children.slice(-1)[0]; // go to its last child first
continue;
}
}
while (!current_node.prev && current_node.parent && current_node.parent.type === 'Slot') {
current_node = current_node.parent;
}
current_node = current_node.prev;
} while (current_node && current_node.type === 'Slot');
return current_node;
}
/**
* @param {import('../nodes/interfaces.js').INode} node
* @param {boolean} adjacent_only
* @returns {Map<import('../nodes/Element.js').default, NodeExistsValue>}
*/
function get_possible_element_siblings(node, adjacent_only) {
/** @type {Map<import('../nodes/Element.js').default, NodeExistsValue>} */
const result = new Map();
/** @type {import('../nodes/interfaces.js').INode} */
let prev = node;
while ((prev = find_previous_sibling(prev))) {
if (prev.type === 'Element') {
if (
!prev.attributes.find(
(attr) => attr.type === 'Attribute' && attr.name.toLowerCase() === 'slot'
)
) {
result.set(prev, NodeExist.Definitely);
}
if (adjacent_only) {
break;
}
} else if (prev.type === 'EachBlock' || prev.type === 'IfBlock' || prev.type === 'AwaitBlock') {
const possible_last_child = get_possible_last_child(prev, adjacent_only);
add_to_map(possible_last_child, result);
if (adjacent_only && has_definite_elements(possible_last_child)) {
return result;
}
}
}
if (!prev || !adjacent_only) {
/** @type {import('../nodes/interfaces.js').INode} */
let parent = node;
let skip_each_for_last_child = node.type === 'ElseBlock';
while (
(parent = parent.parent) &&
(parent.type === 'EachBlock' ||
parent.type === 'IfBlock' ||
parent.type === 'ElseBlock' ||
parent.type === 'AwaitBlock')
) {
const possible_siblings = get_possible_element_siblings(parent, adjacent_only);
add_to_map(possible_siblings, result);
if (parent.type === 'EachBlock') {
// first child of each block can select the last child of each block as previous sibling
if (skip_each_for_last_child) {
skip_each_for_last_child = false;
} else {
add_to_map(get_possible_last_child(parent, adjacent_only), result);
}
} else if (parent.type === 'ElseBlock') {
skip_each_for_last_child = true;
parent = parent.parent;
}
if (adjacent_only && has_definite_elements(possible_siblings)) {
break;
}
}
}
return result;
}
/**
* @param {import('../nodes/EachBlock.js').default | import('../nodes/IfBlock.js').default | import('../nodes/AwaitBlock.js').default} block
* @param {boolean} adjacent_only
* @returns {Map<import('../nodes/Element.js').default, NodeExistsValue>}
*/
function get_possible_last_child(block, adjacent_only) {
/** @typedef {Map<import('../nodes/Element.js').default, NodeExistsValue>} NodeMap */
/** @type {NodeMap} */
const result = new Map();
if (block.type === 'EachBlock') {
/** @type {NodeMap} */
const each_result = loop_child(block.children, adjacent_only);
/** @type {NodeMap} */
const else_result = block.else ? loop_child(block.else.children, adjacent_only) : new Map();
const not_exhaustive = !has_definite_elements(else_result);
if (not_exhaustive) {
mark_as_probably(each_result);
mark_as_probably(else_result);
}
add_to_map(each_result, result);
add_to_map(else_result, result);
} else if (block.type === 'IfBlock') {
/** @type {NodeMap} */
const if_result = loop_child(block.children, adjacent_only);
/** @type {NodeMap} */
const else_result = block.else ? loop_child(block.else.children, adjacent_only) : new Map();
const not_exhaustive = !has_definite_elements(if_result) || !has_definite_elements(else_result);
if (not_exhaustive) {
mark_as_probably(if_result);
mark_as_probably(else_result);
}
add_to_map(if_result, result);
add_to_map(else_result, result);
} else if (block.type === 'AwaitBlock') {
/** @type {NodeMap} */
const pending_result = block.pending
? loop_child(block.pending.children, adjacent_only)
: new Map();
/** @type {NodeMap} */
const then_result = block.then ? loop_child(block.then.children, adjacent_only) : new Map();
/** @type {NodeMap} */
const catch_result = block.catch ? loop_child(block.catch.children, adjacent_only) : new Map();
const not_exhaustive =
!has_definite_elements(pending_result) ||
!has_definite_elements(then_result) ||
!has_definite_elements(catch_result);
if (not_exhaustive) {
mark_as_probably(pending_result);
mark_as_probably(then_result);
mark_as_probably(catch_result);
}
add_to_map(pending_result, result);
add_to_map(then_result, result);
add_to_map(catch_result, result);
}
return result;
}
/**
* @param {Map<import('../nodes/Element.js').default, NodeExistsValue>} result
* @returns {boolean}
*/
function has_definite_elements(result) {
if (result.size === 0) return false;
for (const exist of result.values()) {
if (exist === NodeExist.Definitely) {
return true;
}
}
return false;
}
/**
* @param {Map<import('../nodes/Element.js').default, NodeExistsValue>} from
* @param {Map<import('../nodes/Element.js').default, NodeExistsValue>} to
* @returns {void}
*/
function add_to_map(from, to) {
from.forEach((exist, element) => {
to.set(element, higher_existence(exist, to.get(element)));
});
}
/**
* @param {NodeExistsValue | null} exist1
* @param {NodeExistsValue | null} exist2
* @returns {NodeExistsValue}
*/
function higher_existence(exist1, exist2) {
if (exist1 === undefined || exist2 === undefined) return exist1 || exist2;
return exist1 > exist2 ? exist1 : exist2;
}
/** @param {Map<import('../nodes/Element.js').default, NodeExistsValue>} result */
function mark_as_probably(result) {
for (const key of result.keys()) {
result.set(key, NodeExist.Probably);
}
}
/**
* @param {import('../nodes/interfaces.js').INode[]} children
* @param {boolean} adjacent_only
*/
function loop_child(children, adjacent_only) {
/** @type {Map<import('../nodes/Element.js').default, NodeExistsValue>} */
const result = new Map();
for (let i = children.length - 1; i >= 0; i--) {
const child = children[i];
if (child.type === 'Element') {
result.set(child, NodeExist.Definitely);
if (adjacent_only) {
break;
}
} else if (
child.type === 'EachBlock' ||
child.type === 'IfBlock' ||
child.type === 'AwaitBlock'
) {
const child_result = get_possible_last_child(child, adjacent_only);
add_to_map(child_result, result);
if (adjacent_only && has_definite_elements(child_result)) {
break;
}
}
}
return result;
}
class Block {
/** @type {boolean} */
host;
/** @type {boolean} */
root;
/** @type {import('./private.js').CssNode} */
combinator;
/** @type {import('./private.js').CssNode[]} */
selectors;
/** @type {number} */
start;
/** @type {number} */
end;
/** @type {boolean} */
should_encapsulate;
/** @param {import('./private.js').CssNode} combinator */
constructor(combinator) {
this.combinator = combinator;
this.host = false;
this.root = false;
this.selectors = [];
this.start = null;
this.end = null;
this.should_encapsulate = false;
}
/** @param {import('./private.js').CssNode} selector */
add(selector) {
if (this.selectors.length === 0) {
this.start = selector.start;
this.host = selector.type === 'PseudoClassSelector' && selector.name === 'host';
}
this.root = this.root || (selector.type === 'PseudoClassSelector' && selector.name === 'root');
this.selectors.push(selector);
this.end = selector.end;
}
get global() {
return (
this.selectors.length >= 1 &&
this.selectors[0].type === 'PseudoClassSelector' &&
this.selectors[0].name === 'global' &&
this.selectors.every(
(selector) =>
selector.type === 'PseudoClassSelector' || selector.type === 'PseudoElementSelector'
)
);
}
}
/** @param {import('./private.js').CssNode} selector */
function group_selectors(selector) {
/** @type {Block} */
let block = new Block(null);
const blocks = [block];
selector.children.forEach((child) => {
if (child.type === 'WhiteSpace' || child.type === 'Combinator') {
block = new Block(child);
blocks.push(block);
} else {
block.add(child);
}
});
return blocks;
}