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Merge pull request #3825 from tanhauhau/tanhauhau/unused-css-string-concat

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feat unused css selector that understands string concatenation
pull/3860/head
Rich Harris 5 years ago committed by GitHub
parent f7833ac53e 798a47b1da
commit 33ebcfb575
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GPG Key ID: 4AEE18F83AFDEB23
13 changed files with 364 additions and 9 deletions
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81
src/compiler/compile/css/Selector.ts
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@ -3,6 +3,7 @@ import Stylesheet from './Stylesheet';
import { gather_possible_values, UNKNOWN } from './gather_possible_values';
import { CssNode } from './interfaces';
import Component from '../Component';
import Element from '../nodes/Element';
enum BlockAppliesToNode {
NotPossible,
@ -34,8 +35,8 @@ export default class Selector {
this.used = this.blocks[0].global;
}
apply(node: CssNode, stack: CssNode[]) {
const to_encapsulate: CssNode[] = [];
apply(node: Element, stack: Element[]) {
const to_encapsulate: any[] = [];
apply_selector(this.local_blocks.slice(), node, stack.slice(), to_encapsulate);
@ -132,7 +133,7 @@ export default class Selector {
}
}
function apply_selector(blocks: Block[], node: CssNode, stack: CssNode[], to_encapsulate: any[]): boolean {
function apply_selector(blocks: Block[], node: Element, stack: Element[], to_encapsulate: any[]): boolean {
const block = blocks.pop();
if (!block) return false;
@ -259,16 +260,84 @@ function attribute_matches(node: CssNode, name: string, expected_value: string,
const attr = node.attributes.find((attr: CssNode) => attr.name === name);
if (!attr) return false;
if (attr.is_true) return operator === null;
if (attr.chunks.length > 1) return true;
if (!expected_value) 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();
gather_possible_values(value.node, possible_values);
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: string) => {
if (/^\s/.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: string) => {
remaining.forEach((value: string) => {
combined.push(prev_value + value);
});
});
prev_values = combined;
start_with_space.forEach((value: string) => {
if (/\s$/.test(value)) {
possible_values.add(value);
} else {
prev_values.push(value);
}
});
continue;
} else {
prev_values.forEach(prev_value => possible_values.add(prev_value));
prev_values = [];
}
}
current_possible_values.forEach((current_possible_value: string) => {
if (/\s$/.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) {

143
test/css/samples/unused-selector-string-concat/_config.js
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@ -0,0 +1,143 @@
export default {
warnings: [
{
code: 'css-unused-selector',
message: 'Unused CSS selector',
frame:
` 9: <style>
10: .foo {color: red;}
11: .fooaa {color: red;}
^
12: .foobb {color: red;}
13: .foocc {color: red;}`,
start: { line: 11, column: 2, character: 206 },
end: { line: 11, column: 8, character: 212 },
pos: 206,
},
{
code: 'css-unused-selector',
message: 'Unused CSS selector',
frame:
`10: .foo {color: red;}
11: .fooaa {color: red;}
12: .foobb {color: red;}
^
13: .foocc {color: red;}
14: .foodd {color: red;}`,
start: { line: 12, column: 2, character: 229 },
end: { line: 12, column: 8, character: 235 },
pos: 229,
},
{
code: 'css-unused-selector',
message: 'Unused CSS selector',
frame:
`12: .foobb {color: red;}
13: .foocc {color: red;}
14: .foodd {color: red;}
^
15: .aa {color: red;}
16: .bb {color: red;}`,
start: { line: 14, column: 2, character: 275 },
end: { line: 14, column: 8, character: 281 },
pos: 275,
},
{
code: 'css-unused-selector',
message: 'Unused CSS selector',
frame:
`18: .dd {color: red;}
19: .aabar {color: red;}
20: .bbbar {color: red;}
^
21: .ccbar {color: red;}
22: .ddbar {color: red;}`,
start: { line: 20, column: 2, character: 401 },
end: { line: 20, column: 8, character: 407 },
pos: 401,
},
{
code: 'css-unused-selector',
message: 'Unused CSS selector',
frame:
`19: .aabar {color: red;}
20: .bbbar {color: red;}
21: .ccbar {color: red;}
^
22: .ddbar {color: red;}
23: .fooaabar {color: red;}`,
start: { line: 21, column: 2, character: 424 },
end: { line: 21, column: 8, character: 430 },
pos: 424,
},
{
code: 'css-unused-selector',
message: 'Unused CSS selector',
frame:
`20: .bbbar {color: red;}
21: .ccbar {color: red;}
22: .ddbar {color: red;}
^
23: .fooaabar {color: red;}
24: .foobbbar {color: red;}`,
start: { line: 22, column: 2, character: 447 },
end: { line: 22, column: 8, character: 453 },
pos: 447,
},
{
code: 'css-unused-selector',
message: 'Unused CSS selector',
frame:
`21: .ccbar {color: red;}
22: .ddbar {color: red;}
23: .fooaabar {color: red;}
^
24: .foobbbar {color: red;}
25: .fooccbar {color: red;}`,
start: { line: 23, column: 2, character: 470 },
end: { line: 23, column: 11, character: 479 },
pos: 470,
},
{
code: 'css-unused-selector',
message: 'Unused CSS selector',
frame:
`22: .ddbar {color: red;}
23: .fooaabar {color: red;}
24: .foobbbar {color: red;}
^
25: .fooccbar {color: red;}
26: .fooddbar {color: red;}`,
start: { line: 24, column: 2, character: 496 },
end: { line: 24, column: 11, character: 505 },
pos: 496,
},
{
code: 'css-unused-selector',
message: 'Unused CSS selector',
frame:
`23: .fooaabar {color: red;}
24: .foobbbar {color: red;}
25: .fooccbar {color: red;}
^
26: .fooddbar {color: red;}
27: .baz {color: red;}`,
start: { line: 25, column: 2, character: 522 },
end: { line: 25, column: 11, character: 531 },
pos: 522,
},
{
code: 'css-unused-selector',
message: 'Unused CSS selector',
frame:
`26: .fooddbar {color: red;}
27: .baz {color: red;}
28: .unused {color: red;}
^
29: </style>`,
start: { line: 28, column: 2, character: 595 },
end: { line: 28, column: 9, character: 602 },
pos: 595,
},
],
};

1
test/css/samples/unused-selector-string-concat/expected.css
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@ -0,0 +1 @@
.foo.svelte-xyz{color:red}.foocc.svelte-xyz{color:red}.aa.svelte-xyz{color:red}.bb.svelte-xyz{color:red}.cc.svelte-xyz{color:red}.dd.svelte-xyz{color:red}.aabar.svelte-xyz{color:red}.fooddbar.svelte-xyz{color:red}.baz.svelte-xyz{color:red}

29
test/css/samples/unused-selector-string-concat/input.svelte
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@ -0,0 +1,29 @@
<script>
export let a, b, c;
</script>
<div class="foo{a ? ' aa' : b ? ' bb ' : c ? 'cc ' : 'dd'}bar baz {a ? ' aa' : b ? ' bb ' : c ? 'cc ' : 'dd'}">
some stuff
</div>
<style>
.foo {color: red;}
.fooaa {color: red;}
.foobb {color: red;}
.foocc {color: red;}
.foodd {color: red;}
.aa {color: red;}
.bb {color: red;}
.cc {color: red;}
.dd {color: red;}
.aabar {color: red;}
.bbbar {color: red;}
.ccbar {color: red;}
.ddbar {color: red;}
.fooaabar {color: red;}
.foobbbar {color: red;}
.fooccbar {color: red;}
.fooddbar {color: red;}
.baz {color: red;}
.unused {color: red;}
</style>

3
test/css/samples/unused-selector-ternary-bailed/_config.js
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@ -0,0 +1,3 @@
export default {
warnings: [],
};

1
test/css/samples/unused-selector-ternary-bailed/expected.css
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@ -0,0 +1 @@
.thing.svelte-xyz{color:blue}.active.svelte-xyz{color:blue}.thing.active.svelte-xyz{color:blue}.hover.svelte-xyz{color:blue}.hover.unused.svelte-xyz{color:blue}.unused.svelte-xyz{color:blue}

18
test/css/samples/unused-selector-ternary-bailed/input.svelte
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@ -0,0 +1,18 @@
<script>
export let active;
export let hover;
</script>
<div class="thing {active ? 'active' : hover}">
some stuff
</div>
<style>
.thing {color: blue;}
.active {color: blue;}
.thing.active {color: blue;}
.hover { color: blue; }
.hover.unused { color: blue; }
.unused {color: blue;}
</style>

25
test/css/samples/unused-selector-ternary-concat/_config.js
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@ -0,0 +1,25 @@
export default {
warnings: [
{
code: 'css-unused-selector',
end: {
character: 205,
column: 9,
line: 14,
},
frame: `
12: .thing.active {color: blue;}
13:
14: .unused {color: blue;}
^
15: </style>`,
message: 'Unused CSS selector',
pos: 198,
start: {
character: 198,
column: 2,
line: 14,
},
},
],
};

1
test/css/samples/unused-selector-ternary-concat/expected.css
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@ -0,0 +1 @@
.thing.svelte-xyz{color:blue}.active.svelte-xyz{color:blue}.thing.active.svelte-xyz{color:blue}

15
test/css/samples/unused-selector-ternary-concat/input.svelte
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@ -0,0 +1,15 @@
<script>
export let active;
</script>
<div class="thing {active ? 'active' : ''}">
some stuff
</div>
<style>
.thing {color: blue;}
.active {color: blue;}
.thing.active {color: blue;}
.unused {color: blue;}
</style>

31
test/css/samples/unused-selector-ternary-nested/_config.js
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@ -0,0 +1,31 @@
export default {
warnings: [
{
code: 'css-unused-selector',
message: 'Unused CSS selector',
frame: `
13: .thing.active {color: blue;}
14: .hover { color: blue; }
15: .hover.unused { color: blue; }
^
16:
17: .unused {color: blue;}`,
start: { line: 15, column: 2, character: 261 },
end: { line: 15, column: 15, character: 274 },
pos: 261,
},
{
code: 'css-unused-selector',
message: 'Unused CSS selector',
frame: `
15: .hover.unused { color: blue; }
16:
17: .unused {color: blue;}
^
18: </style>`,
start: { line: 17, column: 2, character: 295 },
end: { line: 17, column: 9, character: 302 },
pos: 295,
},
],
};

1
test/css/samples/unused-selector-ternary-nested/expected.css
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@ -0,0 +1 @@
.thing.svelte-xyz{color:blue}.active.svelte-xyz{color:blue}.thing.active.svelte-xyz{color:blue}.hover.svelte-xyz{color:blue}

18
test/css/samples/unused-selector-ternary-nested/input.svelte
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@ -0,0 +1,18 @@
<script>
export let active;
export let hover;
</script>
<div class="thing {active ? 'active' : hover ? 'hover' : ''}">
some stuff
</div>
<style>
.thing {color: blue;}
.active {color: blue;}
.thing.active {color: blue;}
.hover { color: blue; }
.hover.unused { color: blue; }
.unused {color: blue;}
</style>
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