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processor.go
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processor.go
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package processor
import (
"encoding/base64"
"encoding/json"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"runtime"
"runtime/debug"
"sort"
"strings"
"sync"
)
// Flags set via the CLI which control how the output is displayed
// Files indicates if there should be file output or not when formatting
var Files = false
// Languages indicates if the command line should print out the supported languages
var Languages = false
// Verbose enables verbose logging output
var Verbose = false
// Debug enables debug logging output
var Debug = false
// Trace enables trace logging output which is extremely verbose
var Trace = false
// Duplicates enables duplicate file detection
var Duplicates = false
// Complexity toggles complexity calculation
var Complexity = false
// More enables wider output with more information in formatter
var More = false
// Cocomo toggles the COCOMO calculation
var Cocomo = false
// DisableCheckBinary toggles checking for binary files using NUL bytes
var DisableCheckBinary = false
// SortBy sets which column output in formatter should be sorted by
var SortBy = ""
// Exclude is a regular expression which is used to exclude files from being processed
var Exclude = ""
// Format sets the output format of the formatter
var Format = ""
// FileOutput sets the file that output should be written to
var FileOutput = ""
// PathBlacklist sets the paths that should be skipped
var PathBlacklist = []string{}
// FileListQueueSize is the queue of files found and ready to be read into memory
var FileListQueueSize = runtime.NumCPU()
// FileReadJobWorkers is the number of processes that read files off disk into memory
var FileReadJobWorkers = runtime.NumCPU() * 4
// FileReadContentJobQueueSize is a queue of files ready to be processed
var FileReadContentJobQueueSize = runtime.NumCPU()
// FileProcessJobWorkers is the number of workers that process the file collecting stats
var FileProcessJobWorkers = runtime.NumCPU() * 4
// FileSummaryJobQueueSize is the queue used to hold processed file statistics before formatting
var FileSummaryJobQueueSize = runtime.NumCPU()
// WhiteListExtensions is a list of extensions which are whitelisted to be processed
var WhiteListExtensions = []string{}
// AverageWage is the average wage in dollars used for the COCOMO cost estimate
var AverageWage int64 = 56286
// GcFileCount is the number of files to process before turning the GC back on
var GcFileCount = 10000
var gcPercent = -1
var isLazy = false
// DirFilePaths is not set via flags but by arguments following the flags for file or directory to process
var DirFilePaths = []string{}
// Raw languageDatabase loaded
var languageDatabase = map[string]Language{}
// ExtensionToLanguage is loaded from the JSON that is in constants.go
var ExtensionToLanguage = map[string][]string{}
// LanguageFeatures contains the processed languages from processLanguageFeature
var LanguageFeatures = map[string]LanguageFeature{}
// LanguageFeaturesMutex is the shared mutex used to control getting and setting of language features
// used rather than sync.Map because it turned out to be marginally faster
var LanguageFeaturesMutex = sync.Mutex{}
// ConfigureGc needs to be set outside of ProcessConstants because it should only be enabled in command line
// mode https://github.com/boyter/scc/issues/32
func ConfigureGc() {
gcPercent = debug.SetGCPercent(gcPercent)
}
// ConfigureLazy is a simple setter used to turn on lazy loading used only by command line
func ConfigureLazy(lazy bool) {
isLazy = lazy
}
// ProcessConstants is responsible for setting up the language features based on the JSON file that is stored in constants
// Needs to be called at least once in order for anything to actually happen
func ProcessConstants() {
languageDatabase = loadDatabase()
startTime := makeTimestampNano()
for name, value := range languageDatabase {
for _, ext := range value.Extensions {
ExtensionToLanguage[ext] = append(ExtensionToLanguage[ext], name)
}
}
if Trace {
printTrace(fmt.Sprintf("nanoseconds build extension to language: %d", makeTimestampNano()-startTime))
}
// If lazy is set then we want to load in the features as we find them not in one go
// however otherwise being used as a library so just load them all in
if !isLazy {
startTime = makeTimestampMilli()
for name, value := range languageDatabase {
processLanguageFeature(name, value)
}
if Trace {
printTrace(fmt.Sprintf("milliseconds build language features: %d", makeTimestampMilli()-startTime))
}
} else {
printTrace("configured to lazy load language features")
}
}
// LoadLanguageFeature will load a single feature as requested given the name
func LoadLanguageFeature(loadName string) {
if !isLazy {
return
}
// Check if already loaded and if so return because we don't need to do it again
LanguageFeaturesMutex.Lock()
_, ok := LanguageFeatures[loadName]
LanguageFeaturesMutex.Unlock()
if ok {
return
}
var name string
var value Language
for name, value = range languageDatabase {
if name == loadName {
break
}
}
startTime := makeTimestampNano()
processLanguageFeature(loadName, value)
if Trace {
printTrace(fmt.Sprintf("nanoseconds to build language %s features: %d", loadName, makeTimestampNano()-startTime))
}
}
func processLanguageFeature(name string, value Language) {
complexityTrie := &Trie{}
slCommentTrie := &Trie{}
mlCommentTrie := &Trie{}
stringTrie := &Trie{}
tokenTrie := &Trie{}
complexityMask := byte(0)
singleLineCommentMask := byte(0)
multiLineCommentMask := byte(0)
stringMask := byte(0)
processMask := byte(0)
for _, v := range value.ComplexityChecks {
complexityMask |= v[0]
complexityTrie.Insert(TComplexity, []byte(v))
if !Complexity {
tokenTrie.Insert(TComplexity, []byte(v))
}
}
if !Complexity {
processMask |= complexityMask
}
for _, v := range value.LineComment {
singleLineCommentMask |= v[0]
slCommentTrie.Insert(TSlcomment, []byte(v))
tokenTrie.Insert(TSlcomment, []byte(v))
}
processMask |= singleLineCommentMask
for _, v := range value.MultiLine {
multiLineCommentMask |= v[0][0]
mlCommentTrie.InsertClose(TMlcomment, []byte(v[0]), []byte(v[1]))
tokenTrie.InsertClose(TMlcomment, []byte(v[0]), []byte(v[1]))
}
processMask |= multiLineCommentMask
for _, v := range value.Quotes {
stringMask |= v[0][0]
stringTrie.InsertClose(TString, []byte(v[0]), []byte(v[1]))
tokenTrie.InsertClose(TString, []byte(v[0]), []byte(v[1]))
}
processMask |= stringMask
LanguageFeaturesMutex.Lock()
LanguageFeatures[name] = LanguageFeature{
Complexity: complexityTrie,
MultiLineComments: mlCommentTrie,
SingleLineComments: slCommentTrie,
Strings: stringTrie,
Tokens: tokenTrie,
Nested: value.NestedMultiLine,
ComplexityCheckMask: complexityMask,
MultiLineCommentMask: multiLineCommentMask,
SingleLineCommentMask: singleLineCommentMask,
StringCheckMask: stringMask,
ProcessMask: processMask,
Keywords: value.Keywords,
}
LanguageFeaturesMutex.Unlock()
}
func processFlags() {
// If wide/more mode is enabled we want the complexity calculation
// to happen regardless as that is the only purpose of the flag
if More && Complexity {
Complexity = false
}
if Debug {
printDebug(fmt.Sprintf("Path Black List: %v", PathBlacklist))
printDebug(fmt.Sprintf("Sort By: %s", SortBy))
printDebug(fmt.Sprintf("White List: %v", WhiteListExtensions))
printDebug(fmt.Sprintf("Files Output: %t", Files))
printDebug(fmt.Sprintf("Verbose: %t", Verbose))
printDebug(fmt.Sprintf("Duplicates Detection: %t", Duplicates))
printDebug(fmt.Sprintf("Complexity Calculation: %t", !Complexity))
printDebug(fmt.Sprintf("Wide: %t", More))
printDebug(fmt.Sprintf("Average Wage: %d", AverageWage))
printDebug(fmt.Sprintf("Cocomo: %t", !Cocomo))
}
}
func loadDatabase() map[string]Language {
var database map[string]Language
startTime := makeTimestampMilli()
data, err := base64.StdEncoding.DecodeString(languages)
if err != nil {
panic(fmt.Sprintf("failed to base64 decode languages: %v", err))
}
if err := json.Unmarshal(data, &database); err != nil {
panic(fmt.Sprintf("languages json invalid: %v", err))
}
if Trace {
printTrace(fmt.Sprintf("milliseconds unmarshal: %d", makeTimestampMilli()-startTime))
}
return database
}
func printLanguages() {
database := loadDatabase()
var names []string
for key := range database {
names = append(names, key)
}
sort.Slice(names, func(i, j int) bool {
return strings.Compare(strings.ToLower(names[i]), strings.ToLower(names[j])) < 0
})
for _, name := range names {
fmt.Println(fmt.Sprintf("%s (%s)", name, strings.Join(database[name].Extensions, ",")))
}
}
// Process is the main entry point of the command line it sets everything up and starts running
func Process() {
if Languages {
printLanguages()
return
}
ProcessConstants()
processFlags()
// Clean up any invalid arguments before setting everything up
if len(DirFilePaths) == 0 {
DirFilePaths = append(DirFilePaths, ".")
}
fpath := filepath.Clean(DirFilePaths[0])
if _, err := os.Stat(fpath); os.IsNotExist(err) {
fmt.Println("file or directory does not exists: " + fpath)
return
}
SortBy = strings.ToLower(SortBy)
if Debug {
printDebug(fmt.Sprintf("NumCPU: %d", runtime.NumCPU()))
printDebug(fmt.Sprintf("SortBy: %s", SortBy))
printDebug(fmt.Sprintf("PathBlacklist: %v", PathBlacklist))
}
fileListQueue := make(chan *FileJob, FileListQueueSize) // Files ready to be read from disk
fileReadContentJobQueue := make(chan *FileJob, FileReadContentJobQueueSize) // Files ready to be processed
fileSummaryJobQueue := make(chan *FileJob, FileSummaryJobQueueSize) // Files ready to be summarised
go walkDirectoryParallel(fpath, fileListQueue)
go fileReaderWorker(fileListQueue, fileReadContentJobQueue)
go fileProcessorWorker(fileReadContentJobQueue, fileSummaryJobQueue)
result := fileSummarize(fileSummaryJobQueue)
if FileOutput == "" {
fmt.Println(result)
} else {
_ = ioutil.WriteFile(FileOutput, []byte(result), 0600)
fmt.Println("results written to " + FileOutput)
}
}