refactoring, and more :global(...) fixes

src/generators/extractSelectors.ts

@@ -12,12 +12,9 @@ export default function extractSelectors(css: Node) :Node[] {
 				rule.block.children.forEach(processRule);
 				return;
 			}
-			console.log(rule);
-			throw new Error('nope');
-		}
-		if (rule.type !== 'Rule') {
-			// TODO @media etc
-			throw new Error(`not supported: ${rule.type}`);
+
+			// TODO
+			throw new Error(`Not implemented: @${rule.name}. Please raise an issue at https://github.com/sveltejs/svelte/issues — thanks!`);
 		}
 
 		const selectors = rule.selector.children;
@@ -110,12 +107,13 @@ function selectorAppliesTo(parts: Node[], node: Node, stack: Node[]) {
 				return selectorAppliesTo(parts.slice(0, i), stack.pop(), stack);
 			}
 
-			console.log(part);
+			// TODO other combinators
 			return true;
 		}
 
 		else {
-			throw new Error(`TODO ${part.type}`);
+			// bail. TODO figure out what these could be
+			return true;
 		}
 	}
 

src/generators/shared/processCss.ts

@@ -1,4 +1,5 @@
 import MagicString from 'magic-string';
+import { groupSelectors, isGlobalSelector } from '../../utils/css';
 import { Parsed, Node } from '../../interfaces';
 
 const commentsPattern = /\/\*[\s\S]*?\*\//g;
@@ -37,23 +38,11 @@ export default function processCss(
 
 	parsed.css.children.forEach(walkKeyframes);
 
-	function transformBlock(block: Node[]) {
+	function encapsulateBlock(block: Node[]) {
 		let i = block.length;
 		while (i--) {
 			const child = block[i];
-
-			if (child.type === 'PseudoElementSelector') continue;
-
-			if (child.type === 'PseudoClassSelector') {
-				if (child.name === 'global') {
-					const first = child.children[0];
-					const last = child.children[child.children.length - 1];
-					code.remove(child.start, first.start).remove(last.end, child.end);
-					return;
-				} else {
-					continue;
-				}
-			}
+			if (child.type === 'PseudoElementSelector' || child.type === 'PseudoClassSelector') continue;
 
 			code.appendLeft(child.end, attr);
 			return;
@@ -91,19 +80,20 @@ export default function processCss(
 				// separate .foo > .bar > .baz into three separate blocks, so
 				// that we can transform only the first and last
 				let block: Node[] = [];
-				const blocks: Node[][] = [block];
+				const blocks: Node[][] = groupSelectors(selector);
 
-				selector.children.forEach((child: Node) => {
-					if (child.type === 'WhiteSpace' || child.type === 'Combinator') {
-						block = [];
-						blocks.push(block);
-					} else {
-						block.push(child);
+				blocks.forEach((block: Node[], i) => {
+					if (i === 0 || i === blocks.length - 1) {
+						encapsulateBlock(blocks[i]);
 					}
-				});
 
-				transformBlock(blocks[0]);
-				if (blocks.length > 1) transformBlock(blocks[blocks.length - 1]);
+					if (isGlobalSelector(block)) {
+						const selector = block[0];
+						const first = selector.children[0];
+						const last = selector.children[selector.children.length - 1];
+						code.remove(selector.start, first.start).remove(last.end, selector.end);
+					}
+				});
 			}
 		});
 

src/utils/css.ts

@@ -0,0 +1,21 @@
+import { Node } from '../interfaces';
+
+export function isGlobalSelector(block: Node[]) {
+	return block.length === 1 && block[0].type === 'PseudoClassSelector' && block[0].name === 'global';
+}
+
+export function groupSelectors(selector: Node) {
+	let block: Node[] = [];
+	const blocks: Node[][] = [block];
+
+	selector.children.forEach((child: Node) => {
+		if (child.type === 'WhiteSpace' || child.type === 'Combinator') {
+			block = [];
+			blocks.push(block);
+		} else {
+			block.push(child);
+		}
+	});
+
+	return blocks;
+}

src/validate/css/index.ts

@@ -0,0 +1,58 @@
+import { groupSelectors, isGlobalSelector } from '../../utils/css';
+import { Validator } from '../index';
+import { Node } from '../../interfaces';
+
+export default function validateCss(validator: Validator, css: Node) {
+	function validateRule(rule: Node) {
+		if (rule.type === 'Atrule') {
+			if (rule.name === 'keyframes') return;
+			if (rule.name == 'media') {
+				rule.block.children.forEach(validateRule);
+				return;
+			}
+			
+			// TODO
+			throw new Error(`Not implemented: @${rule.name}. Please raise an issue at https://github.com/sveltejs/svelte/issues — thanks!`);
+		}
+
+		const selectors = rule.selector.children;
+		selectors.forEach(validateSelector);
+	}
+
+	function validateSelector(selector: Node) {
+		const blocks: Node[][] = groupSelectors(selector);
+
+		blocks.forEach((block, i) => {
+			if (block.find((part: Node) => part.type === 'PseudoClassSelector' && part.name === 'global')) {
+				// check that :global(...) is by itself
+				if (block.length !== 1) {
+					validator.error(`:global(...) cannot be mixed with non-global selectors`, block[0].start);
+				}
+
+				// check that :global(...) isn't sandwiched by other selectors
+				// if (i > 0 && i < blocks.length - 1) {
+				// 	validator.error(`:global(...) can be at the start or end of a selector sequence, but not in the middle`, block[0].start);
+				// }
+			}
+		});
+
+		let start = 0;
+		let end = blocks.length;
+
+		for (; start < end; start += 1) {
+			if (!isGlobalSelector(blocks[start])) break;
+		}
+
+		for (; end > start; end -= 1) {
+			if (!isGlobalSelector(blocks[end - 1])) break;
+		}
+
+		for (let i = start; i < end; i += 1) {
+			if (isGlobalSelector(blocks[i])) {
+				validator.error(`:global(...) can be at the start or end of a selector sequence, but not in the middle`, blocks[i][0].start);
+			}
+		}
+	}
+
+	css.children.forEach(validateRule);
+}

src/validate/index.ts

@@ -1,4 +1,5 @@
 import validateJs from './js/index';
+import validateCss from './css/index';
 import validateHtml from './html/index';
 import { getLocator, Location } from 'locate-character';
 import getCodeFrame from '../utils/getCodeFrame';
@@ -101,6 +102,10 @@ export default function validate(
 			validateJs(validator, parsed.js);
 		}
 
+		if (parsed.css) {
+			validateCss(validator, parsed.css);
+		}
+
 		if (parsed.html) {
 			validateHtml(validator, parsed.html);
 		}

test/css/samples/omit-scoping-attribute-descendant-global-inner-multiple/expected.css

@@ -0,0 +1,4 @@
+
+	div[svelte-3386191472] > p > em {
+		color: red;
+	}

test/css/samples/omit-scoping-attribute-descendant-global-inner-multiple/expected.html

@@ -0,0 +1 @@
+<div svelte-3386191472=""></div>

test/css/samples/omit-scoping-attribute-descendant-global-inner-multiple/input.html

@@ -0,0 +1,9 @@
+<div>
+	<!-- html injected somehow -->
+</div>
+
+<style>
+	div > :global(p) > :global(em) {
+		color: red;
+	}
+</style>

test/css/samples/omit-scoping-attribute-descendant-global-outer-multiple/_config.js

@@ -0,0 +1,7 @@
+export default {
+	cascade: false,
+
+	data: {
+		raw: '<p>raw</p>'
+	}
+};

test/css/samples/omit-scoping-attribute-descendant-global-outer-multiple/expected.css

@@ -0,0 +1,4 @@
+
+	div > section > p[svelte-3390623146] {
+		color: red;
+	}

test/css/samples/omit-scoping-attribute-descendant-global-outer-multiple/expected.html

@@ -0,0 +1 @@
+<p svelte-3390623146="">this may or may not be styled</p>

test/css/samples/omit-scoping-attribute-descendant-global-outer-multiple/input.html

@@ -0,0 +1,7 @@
+<p>this may or may not be styled</p>
+
+<style>
+	:global(div) > :global(section) > p {
+		color: red;
+	}
+</style>

test/css/samples/omit-scoping-attribute-global/_config.js

@@ -0,0 +1,7 @@
+export default {
+	cascade: false,
+
+	data: {
+		raw: '<p>raw</p>'
+	}
+};

test/validator/samples/css-invalid-global-placement/errors.json

@@ -0,0 +1,8 @@
+[{
+	"message": ":global(...) can be at the start or end of a selector sequence, but not in the middle",
+	"loc": {
+		"line": 2,
+		"column": 6
+	},
+	"pos": 14
+}]

test/validator/samples/css-invalid-global-placement/input.html

@@ -0,0 +1,5 @@
+<style>
+	.foo :global(.bar) .baz {
+		color: red;
+	}
+</style>

test/validator/samples/css-invalid-global/errors.json

@@ -0,0 +1,8 @@
+[{
+	"message": ":global(...) cannot be mixed with non-global selectors",
+	"loc": {
+		"line": 2,
+		"column": 1
+	},
+	"pos": 9
+}]

test/validator/samples/css-invalid-global/input.html

@@ -0,0 +1,5 @@
+<style>
+	:global(.foo).bar {
+		color: red;
+	}
+</style>