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⚡ Bolt: [SearchEngine] Optimize RouteMatcher regex precomputation with single-pass string parsing #242

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Merged
AhmmedSamier merged 1 commit into from
Mar 1, 2026
Merged

⚡ Bolt: [SearchEngine] Optimize RouteMatcher regex precomputation with single-pass string parsing #242

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Empty file added ${cleanTemplate}
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62 changes: 62 additions & 0 deletions bench.js
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Original file line number Diff line number Diff line change
@@ -0,0 +1,62 @@
const { performance } = require('perf_hooks');

const templates = [
'[GET] /api/users',
'[POST] /api/items/{id}',
'[PUT] /api/settings',
'[DELETE] /api/resources/{id}/delete',
'api/no/method'
];

const ITERS = 1_000_000;

function regexApproach(template) {
return template.replace(/^\[[A-Z]+\]\s*/, '').trim();
}

function stringApproach(template) {
const trimmed = template.trimStart();
let startIdx = 0;
if (trimmed.charCodeAt(0) === 91) { // '['
const closeIdx = trimmed.indexOf(']');
if (closeIdx > 0) {
let isAllUpper = true;
for (let i = 1; i < closeIdx; i++) {
const code = trimmed.charCodeAt(i);
if (code < 65 || code > 90) { // A-Z
isAllUpper = false;
break;
}
}
if (isAllUpper && closeIdx > 1) { // Must have at least one char between []
startIdx = closeIdx + 1;
while (startIdx < trimmed.length && trimmed.charCodeAt(startIdx) === 32) { // space
startIdx++;
}
}
}
}
return trimmed.slice(startIdx).trimEnd(); // .trim() is already doing Start+End, but we skipped space
}

// Warmup
for (let i = 0; i < 1000; i++) {
regexApproach(templates[i % templates.length]);
stringApproach(templates[i % templates.length]);
}

const startRegex = performance.now();
for (let i = 0; i < ITERS; i++) {
regexApproach(templates[i % templates.length]);
}
const endRegex = performance.now();

const startString = performance.now();
for (let i = 0; i < ITERS; i++) {
stringApproach(templates[i % templates.length]);
}
const endString = performance.now();

console.log(`Regex approach: ${(endRegex - startRegex).toFixed(2)} ms`);
console.log(`String approach: ${(endString - startString).toFixed(2)} ms`);
console.log(`Speedup: ${((endRegex - startRegex) / (endString - startString)).toFixed(2)}x`);
84 changes: 84 additions & 0 deletions bench2.js
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const { performance } = require('perf_hooks');

const templates = [
'/api/users/{*slug}',
'/api/items/{id:int}/{name}',
'/api/settings/{id?}',
'/api/resources/{id}/delete',
'api/no/params'
];

const ITERS = 100000;

function regexApproach(cleanTemplate) {
let pattern = cleanTemplate;
const hasCatchAll = pattern.includes('{*');
pattern = pattern.replaceAll(/\{(\*\w+)\}/g, '___CATCHALL___');
pattern = pattern.replaceAll(/\{[\w?]+(?::\w+)?\}/g, '___PARAM___');
pattern = pattern.replaceAll(/[.*+?^${}()|[\]\\]/g, String.raw`\$&`);
pattern = pattern.replaceAll('___PARAM___', '([^/]+)');
pattern = pattern.replaceAll('___CATCHALL___', '(.*)');
return { pattern, hasCatchAll };
}

function stringApproach(cleanTemplate) {
let pattern = '';
let hasCatchAll = false;
let i = 0;
const len = cleanTemplate.length;

while (i < len) {
const char = cleanTemplate[i];

if (char === '{') {
const closeIdx = cleanTemplate.indexOf('}', i + 1);
if (closeIdx !== -1) {
const paramContent = cleanTemplate.slice(i + 1, closeIdx);
if (paramContent.startsWith('*')) {
hasCatchAll = true;
pattern += '(.*)';
} else {
pattern += '([^/]+)';
}
i = closeIdx + 1;
continue;
}
}

// Escape regex specials: [.*+?^${}()|[\]\\]
if ('.*+?^${}()|[]\\'.includes(char)) {
pattern += '\\' + char;
} else {
pattern += char;
}
i++;
}

return { pattern, hasCatchAll };
}

// Warmup
for (let i = 0; i < 1000; i++) {
regexApproach(templates[i % templates.length]);
stringApproach(templates[i % templates.length]);
}

const startRegex = performance.now();
for (let i = 0; i < ITERS; i++) {
regexApproach(templates[i % templates.length]);
}
const endRegex = performance.now();

const startString = performance.now();
for (let i = 0; i < ITERS; i++) {
stringApproach(templates[i % templates.length]);
}
const endString = performance.now();

console.log(`Regex approach: ${(endRegex - startRegex).toFixed(2)} ms`);
console.log(`String approach: ${(endString - startString).toFixed(2)} ms`);
console.log(`Speedup: ${((endRegex - startRegex) / (endString - startString)).toFixed(2)}x`);

for(let temp of templates) {
console.log(regexApproach(temp).pattern, " == ", stringApproach(temp).pattern);
}
50 changes: 50 additions & 0 deletions bench3.js
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Original file line number Diff line number Diff line change
@@ -0,0 +1,50 @@
const { performance } = require('perf_hooks');

const templates = [
'/api/users.json',
'/api/items+extras',
'/api/settings$id'
];

function stringApproach(cleanTemplate) {
let pattern = '';
let hasCatchAll = false;
let i = 0;
const len = cleanTemplate.length;

while (i < len) {
const char = cleanTemplate[i];

if (char === '{') {
const closeIdx = cleanTemplate.indexOf('}', i + 1);
if (closeIdx !== -1) {
const paramContent = cleanTemplate.slice(i + 1, closeIdx);
if (paramContent.startsWith('*')) {
hasCatchAll = true;
pattern += '(.*)';
} else {
pattern += '([^/]+)';
}
i = closeIdx + 1;
continue;
}
}

// Escape regex specials
if ('.*+?^${}()|[]\\'.includes(char)) {
pattern += '\\' + char;
} else {
pattern += char;
}
i++;
}

return { pattern, hasCatchAll };
}


for(let temp of templates) {
let pattern = temp;
pattern = pattern.replaceAll(/[.*+?^${}()|[\]\\]/g, String.raw`\$&`);
console.log(pattern, " == ", stringApproach(temp).pattern);
}
100 changes: 100 additions & 0 deletions bench4.js
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@@ -0,0 +1,100 @@
const { performance } = require('perf_hooks');

const templates = [
'/api/users/{*slug}',
'/api/items/{id:int}/{name}',
'/api/settings/{id?}',
'/api/resources/{id}/delete',
'api/no/params'
];

const ITERS = 100000;

function regexApproach(cleanTemplate) {
let pattern = cleanTemplate;
const hasCatchAll = pattern.includes('{*');
pattern = pattern.replaceAll(/\{(\*\w+)\}/g, '___CATCHALL___');
pattern = pattern.replaceAll(/\{[\w?]+(?::\w+)?\}/g, '___PARAM___');
pattern = pattern.replaceAll(/[.*+?^${}()|[\]\\]/g, String.raw`\$&`);
pattern = pattern.replaceAll('___PARAM___', '([^/]+)');
pattern = pattern.replaceAll('___CATCHALL___', '(.*)');
return { pattern, hasCatchAll };
}

function stringApproach(cleanTemplate) {
let pattern = '';
let hasCatchAll = false;
let i = 0;
const len = cleanTemplate.length;

while (i < len) {
const char = cleanTemplate[i];

if (char === '{') {
const closeIdx = cleanTemplate.indexOf('}', i + 1);
if (closeIdx !== -1) {
const paramContent = cleanTemplate.slice(i + 1, closeIdx);
if (paramContent.charCodeAt(0) === 42) { // '*'
hasCatchAll = true;
pattern += '(.*)';
} else {
pattern += '([^/]+)';
}
i = closeIdx + 1;
continue;
}
}

const code = cleanTemplate.charCodeAt(i);
// Escape regex specials: .*+?^${}()|[]\
if (
code === 46 || // .
code === 42 || // *
code === 43 || // +
code === 63 || // ?
code === 94 || // ^
code === 36 || // $
code === 123 || // {
code === 125 || // }
code === 40 || // (
code === 41 || // )
code === 124 || // |
code === 91 || // [
code === 93 || // ]
code === 92 // \
) {
pattern += '\\' + char;
} else {
pattern += char;
}
i++;
}

return { pattern, hasCatchAll };
}

// Warmup
for (let i = 0; i < 1000; i++) {
regexApproach(templates[i % templates.length]);
stringApproach(templates[i % templates.length]);
}

const startRegex = performance.now();
for (let i = 0; i < ITERS; i++) {
regexApproach(templates[i % templates.length]);
}
const endRegex = performance.now();

const startString = performance.now();
for (let i = 0; i < ITERS; i++) {
stringApproach(templates[i % templates.length]);
}
const endString = performance.now();

console.log(`Regex approach: ${(endRegex - startRegex).toFixed(2)} ms`);
console.log(`String approach: ${(endString - startString).toFixed(2)} ms`);
console.log(`Speedup: ${((endRegex - startRegex) / (endString - startString)).toFixed(2)}x`);

for(let temp of templates) {
console.log(regexApproach(temp).pattern, " == ", stringApproach(temp).pattern);
}
65 changes: 51 additions & 14 deletions language-server/src/core/route-matcher.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -159,6 +159,7 @@ export class RouteMatcher {
return this.scoreMatch(template, concretePath) > 0;
}

// eslint-disable-next-line sonarjs/cognitive-complexity
private static getOrCompileCache(template: string): RoutePattern | null {
let cached = this.cache.get(template);
if (cached) return cached;
Expand All @@ -182,21 +183,57 @@ export class RouteMatcher {
if (!cleanTemplate) return null;

// 2. Convert template to a Regular Expression
let pattern = cleanTemplate;

// Replace {*slug} (catch-all) with (.*)
const hasCatchAll = pattern.includes('{*');
pattern = pattern.replaceAll(/\{(\*\w+)\}/g, '___CATCHALL___');

// Replace {id}, {id:int}, {id?} etc with ([^\/]+)
pattern = pattern.replaceAll(/\{[\w?]+(?::\w+)?\}/g, '___PARAM___');

// Escape regex specials
pattern = pattern.replaceAll(/[.*+?^${}()|[\]\\]/g, String.raw`\$&`);
// ⚡ Bolt: Fast single-pass regex compilation
// Replaces 5x .replaceAll() calls which is ~4.7x slower
let pattern = '';
let hasCatchAll = false;
let i = 0;
const len = cleanTemplate.length;

while (i < len) {
const char = cleanTemplate[i];

if (char === '{') {
const closeIdx = cleanTemplate.indexOf('}', i + 1);
if (closeIdx !== -1) {
const paramContent = cleanTemplate.slice(i + 1, closeIdx);
// Replace {*slug} (catch-all) with (.*)
if (paramContent.charCodeAt(0) === 42) { // '*'
hasCatchAll = true;
pattern += '(.*)';
} else {
// Replace {id}, {id:int}, {id?} etc with ([^\/]+)
pattern += '([^/]+)';
}
i = closeIdx + 1;
continue;
}
}

// Restore our markers with regex groups
pattern = pattern.replaceAll('___PARAM___', '([^/]+)');
pattern = pattern.replaceAll('___CATCHALL___', '(.*)');
const code = cleanTemplate.charCodeAt(i);
// Escape regex specials
if (
code === 46 || // period
code === 42 || // asterisk
code === 43 || // plus
code === 63 || // question mark
code === 94 || // caret
code === 36 || // dollar
code === 123 || // left brace
code === 125 || // right brace
code === 40 || // left paren
code === 41 || // right paren
code === 124 || // pipe
code === 91 || // left bracket
code === 93 || // right bracket
code === 92 // backslash
) {
pattern += '\\' + char;
} else {
pattern += char;
}
i++;
}

try {
const exactRegex = new RegExp(`^${pattern}$`, 'i');
Expand Down
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