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|
package element
import (
"bytes"
"fmt"
"github.com/mitch000001/go-hbci/token"
)
// ExtractElements extracts DataElements from a DataElementGroup
func ExtractElements(dataElementGroup []byte) ([][]byte, error) {
extractor := newElementExtractor(dataElementGroup)
return extractor.Extract()
}
// newElementExtractor creates a new GroupExtractor ready to use
func newElementExtractor(dataElementGroup []byte) *groupExtractor {
// TODO: workaround to get the lexer work properly for us. Maybe we should adopt the lexer?
if bytes.LastIndexFunc(dataElementGroup, func(r rune) bool {
return r == '+' || r == '\''
}) == -1 {
dataElementGroup = append(dataElementGroup, '+')
}
return &groupExtractor{
rawDataElementGroup: dataElementGroup,
}
}
// An groupExtractor extracts DataElements from DataElementGroups
type groupExtractor struct {
rawDataElementGroup []byte
elements [][]byte
}
// Extract extracts DataElements from the underlying DataElementGroup
func (e *groupExtractor) Extract() ([][]byte, error) {
var current []byte
lexer := token.NewLexer("ElementExtractor", e.rawDataElementGroup)
for lexer.HasNext() {
t := lexer.Next()
currentType := t.Type()
if currentType == token.ERROR {
return nil, fmt.Errorf("%T: SyntaxError at position %d: %q\n(%q)", e, t.Pos(), t.Value(), e.rawDataElementGroup)
}
if currentType == token.SEGMENT_END_MARKER || currentType == token.DATA_ELEMENT_SEPARATOR || currentType == token.GROUP_DATA_ELEMENT_SEPARATOR {
e.elements = append(e.elements, current)
current = []byte{}
} else {
current = append(current, t.Value()...)
}
}
result := make([][]byte, len(e.elements))
copy(result, e.elements)
return result, nil
}
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