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abcounter.go
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abcounter.go
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// MIT License
//
// Copyright (c) 2023 Igor Dimitrijevi膰 (igorskyflyer)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
package abcounter
import (
"os"
"regexp"
"strings"
)
func fileExists(filename string) (bool, error) {
_, err := os.Stat(filename)
if os.IsNotExist(err) {
return false, err
} else {
return true, err
}
}
// Counts Adblock filter rules found in the provided string.
//
// It returns the number of filter rules.
func CountRules(source string) int {
var pattern string = `\r?\n`
var regex *regexp.Regexp = regexp.MustCompile(pattern)
var lines []string = regex.Split(source, -1)
var count int = 0
for _, line := range lines {
var trimmedLine string = strings.TrimSpace(line)
if trimmedLine != "" && !strings.HasPrefix(trimmedLine, "!") && !strings.HasPrefix(trimmedLine, "[") {
count++
}
}
return count
}
// Counts Adblock filter rules found in the provided file.
//
// It returns the number of filter rules or -1 in case of an error.
func CountFileRules(filename string) (int, error) {
exists, err := fileExists(filename)
if !exists {
return -1, err
}
source, err := os.ReadFile(filename)
if err != nil {
return -1, err
}
return CountRules(string(source)), nil
}