All files / src/compiler/phases/3-transform utils.js

98% Statements 344/351
96.02% Branches 145/151
100% Functions 10/10
97.98% Lines 341/348

Press n or j to go to the next uncovered block, b, p or k for the previous block.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 3492x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 5547x 5547x 5547x 5547x 5547x 5547x 5547x 36x 36x 36x 36x 5547x 1x 1x 1x 1x 1x 1x           1x 36x 3384x 7x 13x 13x 13x 13x 7x 3384x 6x 6x 6x 6x 6x 6x 6x 36x 5547x 5547x 2x 2x 2x 2x 2x 2x 551x 551x 551x 480x 551x 71x 71x 480x 480x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 14327x 14327x 14327x 14327x 14327x 14327x 14327x 14327x 14327x 14327x 14327x 14327x 14327x 14327x 34302x 59x 59x 34243x 34243x 34281x 34302x 34302x 34302x 34302x 34302x 34302x 33869x 34302x 438x 438x 34302x 33805x 33805x 34302x 14327x 14327x 106x 106x 14221x 14221x 14221x 14327x 7574x 7574x 14221x 14327x 2996x 2996x 2996x 14221x 14327x 3659x 3659x 14221x 14327x 2157x 2157x 2157x 14221x 14221x 14327x 14327x 14327x 13991x 6731x 6731x 6731x 6731x 6731x 6731x 6731x 6731x 14327x 14327x 14327x 14327x 14327x 14327x 14327x 14327x 14327x 14327x 22459x 22459x 22459x 22459x 22459x 7307x 6169x 6169x 6169x 6169x 6169x 6169x 6169x 6169x 6169x 6169x 6169x 7307x 5392x 5392x 5392x 7307x 7186x 7186x 22459x 15152x 15152x 22459x 14221x 14221x 14221x 2x 2x 2x 2x 2x 2x 2x 2x 2x 7358x 7358x 7358x 5159x 7358x 7358x 7358x 7357x     7357x 7357x 115x 115x 7242x 7242x 7242x 7357x 7357x 7357x 7357x 7357x 2303x 7357x 5013x 5013x 3593x 3593x 5013x 7357x 3650x 3650x 3650x 2x 2x 2x 2x 2x 2x 2x 2x 5013x 5013x 5013x 5013x 5013x 5013x 3603x 3519x 3519x 3603x 76x 76x 5013x 5013x 5013x 10743x 10743x 10743x 10743x 10743x 15479x 15479x 15479x 15479x 15479x 15479x 15479x 15479x 9890x 15479x 12167x 12167x 10743x 10743x 10743x 10743x 6578x 312x 312x 6578x 10743x 10743x 10743x 10743x 10743x 1494x 1494x 1494x 2x 2x 2x 2x 2x 2x 2x 2x 7084x 1x 1x 7083x 7083x 10x 10x 7073x 7084x 7084x 2x 2x 2x 2x 2x 2x 2x 16x 16x 16x 16x 16x 16x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 16x 12x 12x 12x 12x 12x 16x  
import {
	regex_ends_with_whitespaces,
	regex_not_whitespace,
	regex_starts_with_whitespaces
} from '../patterns.js';
import * as b from '../../utils/builders.js';
import { walk } from 'zimmerframe';
 
/**
 * @param {string} s
 * @param {boolean} [attr]
 */
export function escape_html(s, attr) {
	if (typeof s !== 'string') return s;
	const delimiter = attr ? '"' : '<';
	const escaped_delimiter = attr ? '&quot;' : '&lt;';
	let i_delimiter = s.indexOf(delimiter);
	let i_ampersand = s.indexOf('&');
 
	if (i_delimiter < 0 && i_ampersand < 0) return s;
 
	let left = 0,
		out = '';
 
	while (i_delimiter >= 0 && i_ampersand >= 0) {
		if (i_delimiter < i_ampersand) {
			if (left < i_delimiter) out += s.substring(left, i_delimiter);
			out += escaped_delimiter;
			left = i_delimiter + 1;
			i_delimiter = s.indexOf(delimiter, left);
		} else {
			if (left < i_ampersand) out += s.substring(left, i_ampersand);
			out += '&amp;';
			left = i_ampersand + 1;
			i_ampersand = s.indexOf('&', left);
		}
	}
 
	if (i_delimiter >= 0) {
		do {
			if (left < i_delimiter) out += s.substring(left, i_delimiter);
			out += escaped_delimiter;
			left = i_delimiter + 1;
			i_delimiter = s.indexOf(delimiter, left);
		} while (i_delimiter >= 0);
	} else if (!attr) {
		while (i_ampersand >= 0) {
			if (left < i_ampersand) out += s.substring(left, i_ampersand);
			out += '&amp;';
			left = i_ampersand + 1;
			i_ampersand = s.indexOf('&', left);
		}
	}
 
	return left < s.length ? out + s.substring(left) : out;
}
 
/**
 * @param {import('estree').Node} node
 * @returns {boolean}
 */
export function is_hoistable_function(node) {
	if (
		node.type === 'ArrowFunctionExpression' ||
		node.type === 'FunctionExpression' ||
		node.type === 'FunctionDeclaration'
	) {
		return node.metadata?.hoistable === true;
	}
	return false;
}
 
/**
 * Extract nodes that are hoisted and trim whitespace according to the following rules:
 * - trim leading and trailing whitespace, regardless of surroundings
 * - keep leading / trailing whitespace of inbetween text nodes,
 *   unless it's whitespace-only, in which case collapse to a single whitespace for all cases
 *   except when it's children of certain elements where we know ignore whitespace (like td/option/head),
 *   in which case we remove it entirely
 * @param {import('#compiler').SvelteNode} parent
 * @param {import('#compiler').SvelteNode[]} nodes
 * @param {import('#compiler').SvelteNode[]} path
 * @param {import('#compiler').Namespace} namespace
 * @param {boolean} preserve_whitespace
 * @param {boolean} preserve_comments
 */
export function clean_nodes(
	parent,
	nodes,
	path,
	namespace = 'html',
	preserve_whitespace,
	preserve_comments
) {
	/** @type {import('#compiler').SvelteNode[]} */
	const hoisted = [];
 
	/** @type {import('#compiler').SvelteNode[]} */
	const regular = [];
 
	for (const node of nodes) {
		if (node.type === 'Comment' && !preserve_comments) {
			continue;
		}
 
		if (
			node.type === 'ConstTag' ||
			node.type === 'DebugTag' ||
			node.type === 'SvelteBody' ||
			node.type === 'SvelteWindow' ||
			node.type === 'SvelteDocument' ||
			node.type === 'SvelteHead' ||
			node.type === 'TitleElement' ||
			node.type === 'SnippetBlock'
		) {
			// TODO others?
			hoisted.push(node);
		} else {
			regular.push(node);
		}
	}
 
	if (preserve_whitespace) {
		return { hoisted, trimmed: regular };
	}
 
	let first, last;
 
	while ((first = regular[0]) && first.type === 'Text' && !regex_not_whitespace.test(first.data)) {
		regular.shift();
	}
 
	if (first?.type === 'Text') {
		first.raw = first.raw.replace(regex_starts_with_whitespaces, '');
		first.data = first.data.replace(regex_starts_with_whitespaces, '');
	}
 
	while ((last = regular.at(-1)) && last.type === 'Text' && !regex_not_whitespace.test(last.data)) {
		regular.pop();
	}
 
	if (last?.type === 'Text') {
		last.raw = last.raw.replace(regex_ends_with_whitespaces, '');
		last.data = last.data.replace(regex_ends_with_whitespaces, '');
	}
 
	const can_remove_entirely =
		(namespace === 'svg' &&
			(parent.type !== 'RegularElement' || parent.name !== 'text') &&
			!path.some((n) => n.type === 'RegularElement' && n.name === 'text')) ||
		(parent.type === 'RegularElement' &&
			// TODO others?
			(parent.name === 'select' ||
				parent.name === 'tr' ||
				parent.name === 'table' ||
				parent.name === 'tbody' ||
				parent.name === 'thead' ||
				parent.name === 'tfoot' ||
				parent.name === 'colgroup' ||
				parent.name === 'datalist'));
 
	/** @type {import('#compiler').SvelteNode[]} */
	const trimmed = [];
 
	// Replace any whitespace between a text and non-text node with a single spaceand keep whitespace
	// as-is within text nodes, or between text nodes and expression tags (because in the end they count
	// as one text). This way whitespace is mostly preserved when using CSS with `white-space: pre-line`
	// and default slot content going into a pre tag (which we can't see).
	for (let i = 0; i < regular.length; i++) {
		const prev = regular[i - 1];
		const node = regular[i];
		const next = regular[i + 1];
 
		if (node.type === 'Text') {
			if (prev?.type !== 'ExpressionTag') {
				const prev_is_text_ending_with_whitespace =
					prev?.type === 'Text' && regex_ends_with_whitespaces.test(prev.data);
				node.data = node.data.replace(
					regex_starts_with_whitespaces,
					prev_is_text_ending_with_whitespace ? '' : ' '
				);
				node.raw = node.raw.replace(
					regex_starts_with_whitespaces,
					prev_is_text_ending_with_whitespace ? '' : ' '
				);
			}
			if (next?.type !== 'ExpressionTag') {
				node.data = node.data.replace(regex_ends_with_whitespaces, ' ');
				node.raw = node.raw.replace(regex_ends_with_whitespaces, ' ');
			}
			if (node.data && (node.data !== ' ' || !can_remove_entirely)) {
				trimmed.push(node);
			}
		} else {
			trimmed.push(node);
		}
	}
 
	return { hoisted, trimmed };
}
 
/**
 * Infers the namespace for the children of a node that should be used when creating the `$.template(...)`.
 * @param {import('#compiler').Namespace} namespace
 * @param {import('#compiler').SvelteNode} parent
 * @param {import('#compiler').SvelteNode[]} nodes
 * @param {import('#compiler').SvelteNode[]} path
 */
export function infer_namespace(namespace, parent, nodes, path) {
	const parent_node =
		parent.type === 'Fragment'
			? // Messy: We know that Fragment calls create_block directly, so we can do this here
				path.at(-1)
			: parent;
 
	if (namespace !== 'foreign') {
		if (parent_node?.type === 'RegularElement' && parent_node.name === 'foreignObject') {
			return 'html';
		}
 
		if (parent_node?.type === 'RegularElement' || parent_node?.type === 'SvelteElement') {
			return parent_node.metadata.svg ? 'svg' : 'html';
		}
 
		// Re-evaluate the namespace inside slot nodes that reset the namespace
		if (
			parent_node === undefined ||
			parent_node.type === 'Root' ||
			parent_node.type === 'Component' ||
			parent_node.type === 'SvelteComponent' ||
			parent_node.type === 'SvelteFragment' ||
			parent_node.type === 'SnippetBlock'
		) {
			const new_namespace = check_nodes_for_namespace(nodes, 'keep');
			if (new_namespace !== 'keep' && new_namespace !== 'maybe_html') {
				return new_namespace;
			}
		}
	}
 
	return namespace;
}
 
/**
 * Heuristic: Keep current namespace, unless we find a regular element,
 * in which case we always want html, or we only find svg nodes,
 * in which case we assume svg.
 * @param {import('#compiler').SvelteNode[]} nodes
 * @param {import('#compiler').Namespace | 'keep' | 'maybe_html'} namespace
 */
function check_nodes_for_namespace(nodes, namespace) {
	/**
	 * @param {import('#compiler').SvelteElement | import('#compiler').RegularElement} node}
	 * @param {{stop: () => void}} context
	 */
	const RegularElement = (node, { stop }) => {
		if (!node.metadata.svg) {
			namespace = 'html';
			stop();
		} else if (namespace === 'keep') {
			namespace = 'svg';
		}
	};
 
	for (const node of nodes) {
		walk(
			node,
			{},
			{
				_(node, { next }) {
					if (
						node.type === 'EachBlock' ||
						node.type === 'IfBlock' ||
						node.type === 'AwaitBlock' ||
						node.type === 'Fragment' ||
						node.type === 'KeyBlock' ||
						node.type === 'RegularElement' ||
						node.type === 'SvelteElement' ||
						node.type === 'Text'
					) {
						next();
					}
				},
				SvelteElement: RegularElement,
				RegularElement,
				Text(node) {
					if (node.data.trim() !== '') {
						namespace = 'maybe_html';
					}
				}
			}
		);
 
		if (namespace === 'html') return namespace;
	}
 
	return namespace;
}
 
/**
 * Determines the namespace the children of this node are in.
 * @param {import('#compiler').RegularElement | import('#compiler').SvelteElement} node
 * @param {import('#compiler').Namespace} namespace
 * @returns {import('#compiler').Namespace}
 */
export function determine_namespace_for_children(node, namespace) {
	if (namespace === 'foreign') {
		return namespace;
	}
 
	if (node.name === 'foreignObject') {
		return 'html';
	}
 
	return node.metadata.svg ? 'svg' : 'html';
}
 
/**
 * @template {import('./types.js').TransformState} T
 * @param {import('estree').CallExpression} node
 * @param {import('zimmerframe').Context<any, T>} context
 */
export function transform_inspect_rune(node, context) {
	const { state, visit } = context;
	const as_fn = state.options.generate === 'client';
 
	if (!state.options.dev) return b.unary('void', b.literal(0));
 
	if (node.callee.type === 'MemberExpression') {
		const raw_inspect_args = /** @type {import('estree').CallExpression} */ (node.callee.object)
			.arguments;
		const inspect_args =
			/** @type {Array<import('estree').Expression>} */
			(raw_inspect_args.map((arg) => visit(arg)));
		const with_arg = /** @type {import('estree').Expression} */ (visit(node.arguments[0]));
 
		return b.call(
			'$.inspect',
			as_fn ? b.thunk(b.array(inspect_args)) : b.array(inspect_args),
			with_arg
		);
	} else {
		const arg = node.arguments.map(
			(arg) => /** @type {import('estree').Expression} */ (visit(arg))
		);
		return b.call('$.inspect', as_fn ? b.thunk(b.array(arg)) : b.array(arg));
	}
}