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c.go
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c.go
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package deps
import (
"fmt"
"io"
"os"
"regexp"
"strings"
"github.com/wakatime/wakatime-cli/pkg/heartbeat"
"github.com/wakatime/wakatime-cli/pkg/log"
"github.com/alecthomas/chroma/v2"
"github.com/alecthomas/chroma/v2/lexers"
)
var cExcludeRegex = regexp.MustCompile(`(?i)^(stdio\.h|stdlib\.h|string\.h|time\.h)$`)
// StateC is a token parsing state.
type StateC int
const (
// StateCUnknown represents a unknown token parsing state.
StateCUnknown StateC = iota
// StateCImport means we are in import section during token parsing.
StateCImport
)
// ParserC is a dependency parser for the c programming language.
// It is not thread safe.
type ParserC struct {
State StateC
Output []string
}
// Parse parses dependencies from C file content using the C lexer.
func (p *ParserC) Parse(filepath string) ([]string, error) {
reader, err := os.Open(filepath) // nolint:gosec
if err != nil {
return nil, fmt.Errorf("failed to open file %q: %s", filepath, err)
}
defer func() {
if err := reader.Close(); err != nil {
log.Debugf("failed to close file: %s", err)
}
}()
p.init()
defer p.init()
data, err := io.ReadAll(reader)
if err != nil {
return nil, fmt.Errorf("failed to read from reader: %s", err)
}
l := lexers.Get(heartbeat.LanguageC.String())
if l == nil {
return nil, fmt.Errorf("failed to get lexer for %s", heartbeat.LanguageC.String())
}
iter, err := l.Tokenise(nil, string(data))
if err != nil {
return nil, fmt.Errorf("failed to tokenize file content: %s", err)
}
for _, token := range iter.Tokens() {
p.processToken(token)
}
return p.Output, nil
}
func (p *ParserC) append(dep string) {
// only consider first part of an import path
dep = strings.Split(dep, "/")[0]
if len(dep) == 0 {
return
}
dep = strings.TrimSpace(dep)
if cExcludeRegex.MatchString(dep) {
return
}
// trim extension
dep = strings.TrimSuffix(dep, ".h")
p.Output = append(p.Output, dep)
}
func (p *ParserC) init() {
p.Output = nil
p.State = StateCUnknown
}
func (p *ParserC) processToken(token chroma.Token) {
switch token.Type {
case chroma.CommentPreproc:
p.processCommentPreproc(token.Value)
case chroma.CommentPreprocFile:
p.processCommentPreprocFile(token.Value)
}
}
func (p *ParserC) processCommentPreproc(value string) {
if strings.HasPrefix(strings.TrimSpace(value), "include") {
p.State = StateCImport
}
}
func (p *ParserC) processCommentPreprocFile(value string) {
if p.State != StateCImport {
return
}
if value != "\n" && value != "#" {
value = strings.Trim(value, `"<> `)
p.append(value)
}
p.State = StateCUnknown
}