source: branches/2929_PrioritizedGrammarEnumeration/HeuristicLab.Algorithms.DataAnalysis.PGE/3.3/go-code/go-pge/config/config.go @ 16080

package config

import (
  "bytes"
  "io"
  "log"
  "strings"
)

func ParseConfig(contents []byte, mapper func(field, value string, config interface{}) (err error), config interface{}) error {
  data := bytes.NewBuffer(contents)

  var field, value string
  var err error

  lineNum := 0
  for {
    l, buferr := data.ReadString('\n') // parse line-by-line
    lineNum++
    l = strings.TrimSpace(l)

    if buferr != nil {
      if buferr != io.EOF {
        return buferr
      }

      if len(l) == 0 {
        break
      }
    }

    if len(l) == 0 {
      continue
    } // empty line

    // strip comments
    if p := strings.Index(l, "#"); p >= 0 { // comment
      l = l[:p]
    }
    // for comments that take a whole line
    l = strings.TrimSpace(l)
    if len(l) == 0 {
      continue
    }

    // fill field and value strings
    if p := strings.Index(l, "="); p >= 0 { // comment
      field = strings.TrimSpace(l[:p-1])
      value = strings.TrimSpace(l[p+1:])
    } else {
      log.Fatalf("No '=' on line %d of config file", lineNum)
    }

    err = mapper(field, value, config)

    if err != nil {
      return err
    }
    // Reached end of data
    if buferr == io.EOF {
      break
    }
  }
  return nil
}