fix: limit match string

.travis.yml

@@ -3,7 +3,7 @@ language: node_js
 node_js:
   - '4'
   - '6'
-  - '7'
+  - '8'
 install:
   - npm i npminstall && npminstall
 script:

appveyor.yml

@@ -2,7 +2,7 @@ environment:
   matrix:
     - nodejs_version: '4'
     - nodejs_version: '6'
-    - nodejs_version: '7'
+    - nodejs_version: '8'
 
 install:
   - ps: Install-Product node $env:nodejs_version
@@ -11,6 +11,6 @@ install:
 test_script:
   - node --version
   - npm --version
-  - npm run ci
+  - npm run test
 
 build: off

index.js

@@ -1,6 +1,6 @@
 'use strict';
 
-const CHARTSET_RE = /(?:charset|encoding)\s*=\s*['"]? *([\w\-]+)/i;
+const CHARTSET_RE = /(?:charset|encoding)\s{0,10}=\s{0,10}['"]? {0,10}([\w\-]{1,100})/i;
 
 module.exports = charset;
 

package.json

@@ -6,14 +6,14 @@
   "scripts": {
     "test": "npm run lint && egg-bin test",
     "ci": "npm run lint && egg-bin cov",
-    "lint": "eslint ."
+    "lint": "eslint test *.js"
   },
   "dependencies": {},
   "devDependencies": {
-    "egg-bin": "^2.0.2",
+    "egg-bin": "1",
     "egg-ci": "^1.1.0",
-    "eslint": "^3.14.1",
-    "eslint-config-egg": "^3.2.0"
+    "eslint": "4",
+    "eslint-config-egg": "5"
   },
   "homepage": "https://github.com/node-modules/charset",
   "repository": {
@@ -32,7 +32,7 @@
     "node": ">=4.0.0"
   },
   "ci": {
-    "version": "4, 6, 7"
+    "version": "4, 6, 8"
   },
   "author": "fengmk2 <fengmk2@gmail.com> (https://fengmk2.com)",
   "license": "MIT"

test/performance.test.js

@@ -0,0 +1,35 @@
+'use strict';
+
+const assert = require('assert');
+const charset = require('..');
+
+describe('performance.test.js', () => {
+  function genstr(len, chr) {
+    let result = '';
+    for (let i = 0; i < len; i++) {
+      result += chr;
+    }
+    return result;
+  }
+  const longspace = genstr(800000, ' ');
+  const longa = genstr(800000, 'a');
+
+  it('should run fast', () => {
+    assert(charset('encoding=' + longspace + '"utf8') === null);
+  });
+
+  it('should ignore space > 10', () => {
+    assert(charset('encoding=' + genstr(0, ' ') + '"utf8') === 'utf8');
+    assert(charset('encoding=' + genstr(9, ' ') + '"utf8') === 'utf8');
+    assert(charset('encoding=' + genstr(10, ' ') + '"utf8') === 'utf8');
+    assert(charset('encoding=' + genstr(11, ' ') + '"utf8') === null);
+  });
+
+  it('should ignore charset length > 100', () => {
+    assert(charset('encoding=' + genstr(11, 'a')) === genstr(11, 'a'));
+    assert(charset('encoding=' + genstr(99, 'a')) === genstr(99, 'a'));
+    assert(charset('encoding=' + genstr(100, 'a')) === genstr(100, 'a'));
+    assert(charset('encoding=' + genstr(101, 'a')) === genstr(100, 'a'));
+    assert(charset('encoding=' + longa) === genstr(100, 'a'));
+  });
+});