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converter.go
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converter.go
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package translator
import (
"io/ioutil"
"log"
"os"
"github.com/yhirose/go-peg"
)
// Converter -
type Converter struct {
parser *peg.Parser
grammar string
err error
debug bool
}
// NewConverter -
func NewConverter(opts ...ConverterOption) (Converter, error) {
c := Converter{}
for i := range opts {
opts[i](&c)
}
if c.err != nil {
return c, c.err
}
if c.grammar == "" {
c.grammar = defaultGrammar
}
parser, err := peg.NewParser(c.grammar)
if err != nil {
return c, err
}
if err := parser.EnableAst(); err != nil {
return c, err
}
c.parser = parser
return c, nil
}
// FromFile -
func (c Converter) FromFile(filename string) (string, error) {
c.trace()
michelson, err := readFileToString(filename)
if err != nil {
return "", err
}
return c.FromString(michelson)
}
// FromString -
func (c Converter) FromString(input string) (string, error) {
c.trace()
ast, err := c.parser.ParseAndGetAst(input, nil)
if err != nil {
return "", err
}
return NewJSONTranslator().Translate(ast)
}
func (c Converter) trace() {
if c.debug {
c.parser.TracerEnter = func(name string, s string, v *peg.Values, d peg.Any, p int) {
log.Printf("Enter: %s %d %d", name, p, len(s))
}
c.parser.TracerLeave = func(name string, s string, v *peg.Values, d peg.Any, p int, l int) {
if l != -1 {
log.Printf("Leave: %s %d %d", name, len(s), l+p)
}
}
}
}
func readFileToString(filename string) (string, error) {
f, err := os.Open(filename)
if err != nil {
return "", err
}
data, err := ioutil.ReadAll(f)
if err != nil {
return "", err
}
return string(data), nil
}