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package parser
import (
"bytes"
"encoding/hex"
"fmt"
"strconv"
"strings"
"github.com/dexon-foundation/dexon/core/vm/sqlvm/ast"
"github.com/dexon-foundation/dexon/core/vm/sqlvm/errors"
"github.com/shopspring/decimal"
)
// Parser was generated with pigeon v1.0.0-99-gbb0192c.
//go:generate pigeon -no-recover -o grammar.go grammar.peg
//go:generate sh -c "sed -f grammar.sed grammar.go > grammar_new.go"
//go:generate mv grammar_new.go grammar.go
//go:generate goimports -w grammar.go
func prepend(x interface{}, xs interface{}) []interface{} {
return append([]interface{}{x}, toSlice(xs)...)
}
func toSlice(x interface{}) []interface{} {
if x == nil {
return nil
}
return x.([]interface{})
}
// TODO(wmin0): finish it.
func isAddress(h []byte) bool {
return false
}
func hexToInteger(h []byte) interface{} {
d := decimal.Zero
l := len(h)
base := decimal.New(16, 0)
for idx, b := range h {
i, err := strconv.ParseInt(string([]byte{b}), 16, 32)
if err != nil {
panic(fmt.Sprintf("invalid hex digit %s: %v", []byte{b}, err))
}
d = d.Add(
decimal.New(i, 0).
Mul(base.Pow(decimal.New(int64(l-idx-1), 0))),
)
}
return ast.IntegerValueNode{V: d, IsAddress: isAddress(h)}
}
func hexToBytes(h []byte) []byte {
bs := make([]byte, hex.DecodedLen(len(h)))
_, err := hex.Decode(bs, h)
if err != nil {
panic(fmt.Sprintf("invalid hex string %s: %v", h, err))
}
return bs
}
func convertNumError(err error) errors.ErrorCode {
if err == nil {
return errors.ErrorCodeNil
}
switch err.(*strconv.NumError).Err {
case strconv.ErrSyntax:
return errors.ErrorCodeSyntax
case strconv.ErrRange:
return errors.ErrorCodeIntegerRange
}
panic(fmt.Sprintf("unknown NumError: %v", err))
}
func convertDecimalError(err error) errors.ErrorCode {
if err == nil {
return errors.ErrorCodeNil
}
errStr := err.Error()
if strings.HasSuffix(errStr, "decimal: fractional part too long") {
return errors.ErrorCodeFractionalPartTooLong
} else if strings.HasSuffix(errStr, "decimal: exponent is not numeric") {
return errors.ErrorCodeSyntax
} else if strings.HasSuffix(errStr, "decimal: too many .s") {
return errors.ErrorCodeSyntax
}
panic(fmt.Sprintf("unknown decimal error: %v", err))
}
func toUint(b []byte) (uint32, errors.ErrorCode) {
i, err := strconv.ParseUint(string(b), 10, 32)
return uint32(i), convertNumError(err)
}
func toDecimal(b []byte) (decimal.Decimal, errors.ErrorCode) {
d, err := decimal.NewFromString(string(b))
return d, convertDecimalError(err)
}
func toLower(b []byte) []byte {
return bytes.ToLower(b)
}
func joinBytes(x interface{}) []byte {
xs := toSlice(x)
bs := []byte{}
for _, b := range xs {
bs = append(bs, b.([]byte)...)
}
return bs
}
func opSetSubject(op interface{}, s interface{}) interface{} {
x := op.(ast.BinaryOperator)
x.SetSubject(s)
return x
}
func opSetObject(op interface{}, o interface{}) interface{} {
x := op.(ast.BinaryOperator)
x.SetObject(o)
return x
}
func opSetTarget(op interface{}, t interface{}) interface{} {
x := op.(ast.UnaryOperator)
x.SetTarget(t)
return x
}
func joinOperator(x interface{}, o interface{}) {
if op, ok := x.(ast.UnaryOperator); ok {
joinOperator(op.GetTarget(), o)
return
}
if op, ok := x.(ast.BinaryOperator); ok {
op.SetObject(o)
return
}
}
func rightJoinOperators(o interface{}, x interface{}) interface{} {
xs := toSlice(x)
if len(xs) == 0 {
return o
}
l := len(xs)
for idx := 0; idx < l-1; idx++ {
joinOperator(xs[idx+1], xs[idx])
}
joinOperator(xs[0], o)
return xs[l-1]
}
// TODO(wmin0): finish it.
func resolveString(s []byte) []byte {
return s
}
// ParseString parses input string to AST.
func ParseString(s string) (interface{}, error) {
root, pigeonErr := ParseReader("", strings.NewReader(s))
if pigeonErr == nil {
return root, pigeonErr
}
pigeonErrList := pigeonErr.(errList)
sqlvmErrList := make(errors.ErrorList, len(pigeonErrList))
for i := range pigeonErrList {
parserErr := pigeonErrList[i].(*parserError)
if sqlvmErr, ok := parserErr.Inner.(errors.Error); ok {
sqlvmErrList[i] = sqlvmErr
} else {
sqlvmErrList[i] = errors.Error{
Position: uint32(parserErr.pos.offset),
Category: errors.ErrorCategoryGrammar,
Code: errors.ErrorCodeParser,
Token: "",
Prefix: parserErr.prefix,
Message: parserErr.Inner.Error(),
}
}
}
return root, sqlvmErrList
}
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