67 lines
1.3 KiB
Go
67 lines
1.3 KiB
Go
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package debug
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import (
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"bufio"
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"fmt"
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"os"
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"path/filepath"
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"regexp"
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"runtime"
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"strings"
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)
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var varRegex = regexp.MustCompile(`(?:var)?\s*(\w*)\s*:?=`)
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func getPackageName(f runtime.Frame) string {
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parts := strings.Split(f.Func.Name(), ".")
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pl := len(parts)
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if parts[pl-2][0] == '(' {
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return strings.Join(parts[0:pl-2], ".")
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} else {
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return strings.Join(parts[0:pl-1], ".")
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}
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}
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func getVarName(filename string, lineNo int) string {
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f, err := os.Open(filename)
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if err != nil {
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return ""
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}
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scanner := bufio.NewScanner(f)
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for i := 0; i < lineNo; i++ {
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scanner.Scan()
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}
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line := scanner.Text()
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if matches := varRegex.FindStringSubmatch(line); matches != nil {
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return matches[1]
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}
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return ""
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}
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// GetDefinition returns the name of the variable and location this parser was defined by walking up the stack
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func GetDefinition() (varName string, location string) {
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pc := make([]uintptr, 64)
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n := runtime.Callers(3, pc)
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frames := runtime.CallersFrames(pc[:n])
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var frame runtime.Frame
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more := true
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for more {
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frame, more = frames.Next()
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pkg := getPackageName(frame)
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if pkg == "github.com/vektah/goparsify" || pkg == "github.com/vektah/goparsify/debug" {
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continue
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}
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varName := getVarName(frame.File, frame.Line)
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if varName != "" {
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return varName, fmt.Sprintf("%s:%d", filepath.Base(frame.File), frame.Line)
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}
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}
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return "", ""
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}
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