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const REGEX_MATCHER = /^[~^$*|]?=/;
const REGEX_CLOSING_BRACKET = /[\s\]]/;
const REGEX_ATTRIBUTE_FLAGS = /^[a-zA-Z]+/; // only `i` and `s` are valid today, but make it future-proof
const REGEX_COMBINATOR_WHITESPACE = /^\s*(\+|~|>|\|\|)\s*/;
const REGEX_COMBINATOR = /^(\+|~|>|\|\|)/;
const REGEX_PERCENTAGE = /^\d+(\.\d+)?%/;
const REGEX_NTH_OF =
/^(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_LEADING_HYPHEN_OR_DIGIT = /-?\d/;
const REGEX_VALID_IDENTIFIER_CHAR = /[a-zA-Z0-9_-]/;
const REGEX_COMMENT_CLOSE = /\*\//;
const REGEX_HTML_COMMENT_CLOSE = /-->/;
/**
* @param {import('../index.js').Parser} parser
* @param {number} start
* @param {Array<import('#compiler').Attribute | import('#compiler').SpreadAttribute | import('#compiler').Directive>} attributes
* @returns {import('#compiler').Css.StyleSheet}
*/
export default function read_style(parser, start, attributes) {
const content_start = parser.index;
const children = read_body(parser, '</style');
const content_end = parser.index;
parser.read(/^<\/style\s*>/);
return {
type: 'StyleSheet',
start,
end: parser.index,
attributes,
children,
content: {
start: content_start,
end: content_end,
styles: parser.template.slice(content_start, content_end),
comment: null
}
};
}
/**
* @param {import('../index.js').Parser} parser
* @param {string} close
* @returns {any[]}
*/
function read_body(parser, close) {
/** @type {Array<import('#compiler').Css.Rule | import('#compiler').Css.Atrule>} */
const children = [];
while (parser.index < parser.template.length) {
allow_comment_or_whitespace(parser);
if (parser.match(close)) {
return children;
}
if (parser.match('@')) {
children.push(read_at_rule(parser));
} else {
children.push(read_rule(parser));
}
}
error(parser.template.length, 'expected-token', close);
}
/**
* @param {import('../index.js').Parser} parser
* @returns {import('#compiler').Css.Atrule}
*/
function read_at_rule(parser) {
const start = parser.index;
parser.eat('@', true);
const name = read_identifier(parser);
const prelude = read_value(parser);
/** @type {import('#compiler').Css.Block | null} */
let block = null;
if (parser.match('{')) {
// e.g. `@media (...) {...}`
block = read_block(parser);
} else {
// e.g. `@import '...'`
parser.eat(';', true);
}
return {
type: 'Atrule',
start,
end: parser.index,
name,
prelude,
block
};
}
/**
* @param {import('../index.js').Parser} parser
* @returns {import('#compiler').Css.Rule}
*/
function read_rule(parser) {
const start = parser.index;
return {
type: 'Rule',
prelude: read_selector_list(parser),
block: read_block(parser),
start,
end: parser.index,
metadata: {
parent_rule: null,
has_local_selectors: false
}
};
}
/**
* @param {import('../index.js').Parser} parser
* @param {boolean} [inside_pseudo_class]
* @returns {import('#compiler').Css.SelectorList}
*/
function read_selector_list(parser, inside_pseudo_class = false) {
/** @type {import('#compiler').Css.ComplexSelector[]} */
const children = [];
allow_comment_or_whitespace(parser);
const start = parser.index;
while (parser.index < parser.template.length) {
children.push(read_selector(parser, inside_pseudo_class));
const end = parser.index;
parser.allow_whitespace();
if (inside_pseudo_class ? parser.match(')') : parser.match('{')) {
return {
type: 'SelectorList',
start,
end,
children
};
} else {
parser.eat(',', true);
allow_comment_or_whitespace(parser);
}
}
error(parser.template.length, 'unexpected-eof');
}
/**
* @param {import('../index.js').Parser} parser
* @param {boolean} [inside_pseudo_class]
* @returns {import('#compiler').Css.ComplexSelector}
*/
function read_selector(parser, inside_pseudo_class = false) {
const list_start = parser.index;
/** @type {import('#compiler').Css.RelativeSelector[]} */
const children = [];
/**
* @param {import('#compiler').Css.Combinator | null} combinator
* @param {number} start
* @returns {import('#compiler').Css.RelativeSelector}
*/
function create_selector(combinator, start) {
return {
type: 'RelativeSelector',
combinator,
selectors: [],
start,
end: -1,
metadata: {
is_global: false,
is_host: false,
is_root: false,
scoped: false
}
};
}
/** @type {import('#compiler').Css.RelativeSelector} */
let relative_selector = create_selector(null, parser.index);
while (parser.index < parser.template.length) {
let start = parser.index;
if (parser.eat('&')) {
relative_selector.selectors.push({
type: 'NestingSelector',
name: '&',
start,
end: parser.index
});
} else if (parser.eat('*')) {
let name = '*';
if (parser.eat('|')) {
// * is the namespace (which we ignore)
name = read_identifier(parser);
}
relative_selector.selectors.push({
type: 'TypeSelector',
name,
start,
end: parser.index
});
} else if (parser.eat('#')) {
relative_selector.selectors.push({
type: 'IdSelector',
name: read_identifier(parser),
start,
end: parser.index
});
} else if (parser.eat('.')) {
relative_selector.selectors.push({
type: 'ClassSelector',
name: read_identifier(parser),
start,
end: parser.index
});
} else if (parser.eat('::')) {
relative_selector.selectors.push({
type: 'PseudoElementSelector',
name: read_identifier(parser),
start,
end: parser.index
});
// We read the inner selectors of a pseudo element to ensure it parses correctly,
// but we don't do anything with the result.
if (parser.eat('(')) {
read_selector_list(parser, true);
parser.eat(')', true);
}
} else if (parser.eat(':')) {
const name = read_identifier(parser);
/** @type {null | import('#compiler').Css.SelectorList} */
let args = null;
if (parser.eat('(')) {
args = read_selector_list(parser, true);
parser.eat(')', true);
} else if (name === 'global') {
error(parser.index, 'invalid-css-global-selector');
}
relative_selector.selectors.push({
type: 'PseudoClassSelector',
name,
args,
start,
end: parser.index
});
} else if (parser.eat('[')) {
parser.allow_whitespace();
const name = read_identifier(parser);
parser.allow_whitespace();
/** @type {string | null} */
let value = null;
const matcher = parser.read(REGEX_MATCHER);
if (matcher) {
parser.allow_whitespace();
value = read_attribute_value(parser);
}
parser.allow_whitespace();
const flags = parser.read(REGEX_ATTRIBUTE_FLAGS);
parser.allow_whitespace();
parser.eat(']', true);
relative_selector.selectors.push({
type: 'AttributeSelector',
start,
end: parser.index,
name,
matcher,
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
relative_selector.selectors.push({
type: 'Nth',
value: /**@type {string} */ (parser.read(REGEX_NTH_OF)),
start,
end: parser.index
});
} else if (parser.match_regex(REGEX_PERCENTAGE)) {
relative_selector.selectors.push({
type: 'Percentage',
value: /** @type {string} */ (parser.read(REGEX_PERCENTAGE)),
start,
end: parser.index
});
} else if (!parser.match_regex(REGEX_COMBINATOR)) {
let name = read_identifier(parser);
if (parser.eat('|')) {
// we ignore the namespace when trying to find matching element classes
name = read_identifier(parser);
}
relative_selector.selectors.push({
type: 'TypeSelector',
name,
start,
end: parser.index
});
}
const index = parser.index;
parser.allow_whitespace();
if (parser.match(',') || (inside_pseudo_class ? parser.match(')') : parser.match('{'))) {
// rewind, so we know whether to continue building the selector list
parser.index = index;
relative_selector.end = index;
children.push(relative_selector);
return {
type: 'ComplexSelector',
start: list_start,
end: index,
children,
metadata: {
rule: null,
used: false
}
};
}
parser.index = index;
const combinator = read_combinator(parser);
if (combinator) {
if (relative_selector.selectors.length === 0) {
if (!inside_pseudo_class) {
error(start, 'invalid-css-selector');
}
} else {
relative_selector.end = index;
children.push(relative_selector);
}
// ...and start a new one
relative_selector = create_selector(combinator, combinator.start);
parser.allow_whitespace();
if (parser.match(',') || (inside_pseudo_class ? parser.match(')') : parser.match('{'))) {
error(parser.index, 'invalid-css-selector');
}
}
}
error(parser.template.length, 'unexpected-eof');
}
/**
* @param {import('../index.js').Parser} parser
* @returns {import('#compiler').Css.Combinator | null}
*/
function read_combinator(parser) {
const start = parser.index;
parser.allow_whitespace();
const index = parser.index;
const name = parser.read(REGEX_COMBINATOR);
if (name) {
const end = parser.index;
parser.allow_whitespace();
return {
type: 'Combinator',
name,
start: index,
end
};
}
if (parser.index !== start) {
return {
type: 'Combinator',
name: ' ',
start,
end: parser.index
};
}
return null;
}
/**
* @param {import('../index.js').Parser} parser
* @returns {import('#compiler').Css.Block}
*/
function read_block(parser) {
const start = parser.index;
parser.eat('{', true);
/** @type {Array<import('#compiler').Css.Declaration | import('#compiler').Css.Rule | import('#compiler').Css.Atrule>} */
const children = [];
while (parser.index < parser.template.length) {
allow_comment_or_whitespace(parser);
if (parser.match('}')) {
break;
} else {
children.push(read_block_item(parser));
}
}
parser.eat('}', true);
return {
type: 'Block',
start,
end: parser.index,
children
};
}
/**
* Reads a declaration, rule or at-rule
*
* @param {import('../index.js').Parser} parser
* @returns {import('#compiler').Css.Declaration | import('#compiler').Css.Rule | import('#compiler').Css.Atrule}
*/
function read_block_item(parser) {
if (parser.match('@')) {
return read_at_rule(parser);
}
// read ahead to understand whether we're dealing with a declaration or a nested rule.
// this involves some duplicated work, but avoids a try-catch that would disguise errors
const start = parser.index;
read_value(parser);
const char = parser.template[parser.index];
parser.index = start;
return char === '{' ? read_rule(parser) : read_declaration(parser);
}
/**
* @param {import('../index.js').Parser} parser
* @returns {import('#compiler').Css.Declaration}
*/
function read_declaration(parser) {
const start = parser.index;
const property = parser.read_until(REGEX_WHITESPACE_OR_COLON);
parser.allow_whitespace();
parser.eat(':');
parser.allow_whitespace();
const value = read_value(parser);
if (!value && !property.startsWith('--')) {
error(parser.index, 'invalid-css-declaration');
}
const end = parser.index;
if (!parser.match('}')) {
parser.eat(';', true);
}
return {
type: 'Declaration',
start,
end,
property,
value
};
}
/**
* @param {import('../index.js').Parser} parser
* @returns {string}
*/
function read_value(parser) {
let value = '';
let escaped = false;
let in_url = false;
/** @type {null | '"' | "'"} */
let quote_mark = null;
while (parser.index < parser.template.length) {
const char = parser.template[parser.index];
if (escaped) {
value += '\\' + char;
escaped = false;
} else if (char === '\\') {
escaped = true;
} else if (char === quote_mark) {
quote_mark = null;
} else if (char === ')') {
in_url = false;
} else if (quote_mark === null && (char === '"' || char === "'")) {
quote_mark = char;
} else if (char === '(' && value.slice(-3) === 'url') {
in_url = true;
} else if ((char === ';' || char === '{' || char === '}') && !in_url && !quote_mark) {
return value.trim();
}
value += char;
parser.index++;
}
error(parser.template.length, 'unexpected-eof');
}
/**
* Read a property that may or may not be quoted, e.g.
* `foo` or `'foo bar'` or `"foo bar"`
* @param {import('../index.js').Parser} parser
*/
function read_attribute_value(parser) {
let value = '';
let escaped = false;
const quote_mark = parser.eat('"') ? '"' : parser.eat("'") ? "'" : null;
while (parser.index < parser.template.length) {
const char = parser.template[parser.index];
if (escaped) {
value += '\\' + char;
escaped = false;
} else if (char === '\\') {
escaped = true;
} else if (quote_mark ? char === quote_mark : REGEX_CLOSING_BRACKET.test(char)) {
if (quote_mark) {
parser.eat(quote_mark, true);
}
return value.trim();
} else {
value += char;
}
parser.index++;
}
error(parser.template.length, 'unexpected-eof');
}
/**
* https://www.w3.org/TR/CSS21/syndata.html#value-def-identifier
* @param {import('../index.js').Parser} parser
*/
function read_identifier(parser) {
const start = parser.index;
let identifier = '';
if (parser.match('--') || parser.match_regex(REGEX_LEADING_HYPHEN_OR_DIGIT)) {
error(start, 'invalid-css-identifier');
}
let escaped = false;
while (parser.index < parser.template.length) {
const char = parser.template[parser.index];
if (escaped) {
identifier += '\\' + char;
escaped = false;
} else if (char === '\\') {
escaped = true;
} else if (
/** @type {number} */ (char.codePointAt(0)) >= 160 ||
REGEX_VALID_IDENTIFIER_CHAR.test(char)
) {
identifier += char;
} else {
break;
}
parser.index++;
}
if (identifier === '') {
error(start, 'invalid-css-identifier');
}
return identifier;
}
/** @param {import('../index.js').Parser} parser */
function allow_comment_or_whitespace(parser) {
parser.allow_whitespace();
while (parser.match('/*') || parser.match('<!--')) {
if (parser.eat('/*')) {
parser.read_until(REGEX_COMMENT_CLOSE);
parser.eat('*/', true);
}
if (parser.eat('<!--')) {
parser.read_until(REGEX_HTML_COMMENT_CLOSE);
parser.eat('-->', true);
}
parser.allow_whitespace();
}
}
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