func ParseJsonObject(pg expr.TokenPager, jh u.JsonHelper) error {
if pg.Cur().T != lex.TokenLeftBrace {
return fmt.Errorf("Expected json { but got: %v", pg.Cur().T.String())
}
pg.Next() // Consume {
for {
//u.Debug(pg.Cur())
switch pg.Cur().T {
case lex.TokenIdentity:
if err := parseJsonKeyValue(pg, jh); err != nil {
return err
}
default:
return fmt.Errorf("Expected json key identity but got: %v", pg.Cur().String())
}
switch pg.Cur().T {
case lex.TokenComma:
pg.Next()
case lex.TokenRightBrace:
pg.Next() // Consume the right }
return nil
default:
return fmt.Errorf("Expected json comma or end of object but got: %v", pg.Cur().String())
}
}
return nil // panic? error? not reachable
}
func ParseWith(pg expr.TokenPager) (u.JsonHelper, error) {
//u.Debugf("parseWith: %v", pg.Cur())
if pg.Cur().T != lex.TokenWith {
// This is an optional statement
return nil, nil
}
pg.Next() // consume WITH
jh := make(u.JsonHelper)
switch pg.Cur().T {
case lex.TokenLeftBrace: // {
if err := ParseJsonObject(pg, jh); err != nil {
return nil, err
}
case lex.TokenIdentity:
// name=value pairs
if err := ParseKeyValue(pg, jh); err != nil {
return nil, err
}
default:
u.Warnf("unexpected token? %v", pg.Cur())
return nil, fmt.Errorf("Expected json { , or name=value but got: %v", pg.Cur().T.String())
}
return jh, nil
}
func parseColumns(m expr.TokenPager, fr expr.FuncResolver, buildVm bool, stmt ColumnsStatement) error {
var col *Column
for {
//u.Debug(m.Cur())
switch m.Cur().T {
case lex.TokenStar, lex.TokenMultiply:
col = &Column{Star: true}
m.Next()
case lex.TokenUdfExpr:
// we have a udf/functional expression column
col = NewColumnFromToken(m.Cur())
funcName := strings.ToLower(m.Cur().V)
tree := expr.NewTreeFuncs(m, fr)
if err := tree.BuildTree(buildVm); err != nil {
u.Errorf("could not parse: %v", err)
return err
}
col.Expr = tree.Root
col.SourceField = expr.FindIdentityField(col.Expr)
if strings.Contains(col.SourceField, ".") {
if _, right, hasLeft := expr.LeftRight(col.SourceField); hasLeft {
col.SourceField = right
}
}
col.Agg = expr.IsAgg(funcName)
if m.Cur().T != lex.TokenAs {
switch n := col.Expr.(type) {
case *expr.FuncNode:
// lets lowercase name
n.Name = funcName
col.As = expr.FindIdentityName(0, n, "")
//u.Infof("col %#v", col)
if col.As == "" {
if strings.ToLower(n.Name) == "count" {
//u.Warnf("count*")
col.As = "count(*)"
} else {
col.As = n.Name
}
}
case *expr.BinaryNode:
//u.Debugf("udf? %T ", col.Expr)
col.As = expr.FindIdentityName(0, n, "")
if col.As == "" {
u.Errorf("could not find as name: %#v", n)
}
}
} else {
switch n := col.Expr.(type) {
case *expr.FuncNode:
n.Name = funcName
}
}
//u.Debugf("next? %v", m.Cur())
case lex.TokenIdentity:
col = NewColumnFromToken(m.Cur())
tree := expr.NewTreeFuncs(m, fr)
if err := tree.BuildTree(buildVm); err != nil {
u.Errorf("could not parse: %v", err)
return err
}
col.Expr = tree.Root
case lex.TokenValue, lex.TokenInteger:
// Value Literal
col = NewColumnValue(m.Cur())
tree := expr.NewTreeFuncs(m, fr)
if err := tree.BuildTree(buildVm); err != nil {
u.Errorf("could not parse: %v", err)
return err
}
col.Expr = tree.Root
}
//u.Debugf("after colstart?: %v ", m.Cur())
// since we can loop inside switch statement
switch m.Cur().T {
case lex.TokenAs:
m.Next()
switch m.Cur().T {
case lex.TokenIdentity, lex.TokenValue:
col.As = m.Cur().V
col.originalAs = col.As
col.asQuoteByte = m.Cur().Quote
m.Next()
continue
}
return fmt.Errorf("expected identity but got: %v", m.Cur().String())
case lex.TokenFrom, lex.TokenInto, lex.TokenLimit, lex.TokenEOS, lex.TokenEOF:
// This indicates we have come to the End of the columns
stmt.AddColumn(*col)
//u.Debugf("Ending column ")
return nil
case lex.TokenIf:
// If guard
m.Next()
//u.Infof("if guard: %v", m.Cur())
tree := expr.NewTreeFuncs(m, fr)
if err := tree.BuildTree(buildVm); err != nil {
u.Errorf("could not parse: %v", err)
return err
}
col.Guard = tree.Root
// Hm, we need to backup here? Parse Node went to deep?
continue
//u.Infof("if guard 2: %v", m.Cur())
//u.Debugf("after if guard?: %v ", m.Cur())
case lex.TokenCommentSingleLine:
m.Next()
col.Comment = m.Cur().V
case lex.TokenRightParenthesis:
// loop on my friend
case lex.TokenComma:
//u.Infof("? %#v", stmt)
//u.Infof("col?%+v", col)
stmt.AddColumn(*col)
//u.Debugf("comma, added cols: %v", len(stmt.Columns))
default:
return fmt.Errorf("expected column but got: %v", m.Cur().String())
}
m.Next()
}
//u.Debugf("cols: %d", len(stmt.Columns))
return nil
}
func ParseKeyValue(pg expr.TokenPager, jh u.JsonHelper) error {
if pg.Cur().T != lex.TokenIdentity {
return fmt.Errorf("Expected key/identity for key=value, array but got: %v", pg.Cur().String())
}
for {
key := pg.Cur().V
pg.Next()
switch pg.Cur().T {
case lex.TokenEOF, lex.TokenEOS:
return nil
}
if pg.Cur().T != lex.TokenEqual {
pg.Backup() // whoops, we consumed too much
pg.Backup()
//u.Debugf("exit keyvalue %v", pg.Cur())
return nil
}
pg.Next() // consume equal
//u.Debugf("%s = %v", key, pg.Cur())
switch pg.Cur().T {
case lex.TokenIdentity:
bv, err := strconv.ParseBool(pg.Cur().V)
if err == nil {
jh[key] = bv
} else {
jh[key] = pg.Cur().V
}
case lex.TokenValue:
jh[key] = pg.Cur().V
case lex.TokenBool:
bv, err := strconv.ParseBool(pg.Cur().V)
if err != nil {
return err
}
jh[key] = bv
case lex.TokenInteger:
iv, err := strconv.ParseInt(pg.Cur().V, 10, 64)
if err != nil {
return err
}
jh[key] = iv
case lex.TokenFloat:
fv, err := strconv.ParseFloat(pg.Cur().V, 64)
if err != nil {
return err
}
jh[key] = fv
default:
u.Warnf("got unexpected token: %s", pg.Cur())
return fmt.Errorf("Expected value but got: %v for name=value context", pg.Cur().T.String())
}
pg.Next() // consume value
//u.Debugf("cur: %v", pg.Cur())
if pg.Cur().T != lex.TokenComma {
//u.Debugf("finished loop: jh.len=%v token=%v", len(jh), pg.Cur())
return nil
}
pg.Next() // consume comma
}
panic("unreachable")
}
func ParseJsonArray(pg expr.TokenPager) ([]interface{}, error) {
if pg.Cur().T != lex.TokenLeftBracket {
return nil, fmt.Errorf("Expected json [ but got: %v", pg.Cur().T.String())
}
la := make([]interface{}, 0)
pg.Next() // Consume [
for {
//u.Debug(pg.Cur())
switch pg.Cur().T {
case lex.TokenValue:
la = append(la, pg.Cur().V)
pg.Next()
case lex.TokenBool:
bv, err := strconv.ParseBool(pg.Cur().V)
if err != nil {
return nil, err
}
la = append(la, bv)
pg.Next()
case lex.TokenInteger:
iv, err := strconv.ParseInt(pg.Cur().V, 10, 64)
if err != nil {
return nil, err
}
la = append(la, iv)
pg.Next()
case lex.TokenFloat:
fv, err := strconv.ParseFloat(pg.Cur().V, 64)
if err != nil {
return nil, err
}
la = append(la, fv)
pg.Next()
case lex.TokenLeftBrace: // {
obj := make(u.JsonHelper)
if err := ParseJsonObject(pg, obj); err != nil {
return nil, err
}
la = append(la, obj)
case lex.TokenLeftBracket: // [
list, err := ParseJsonArray(pg)
if err != nil {
return nil, err
}
//u.Debugf("list after: %#v", list)
la = append(la, list)
case lex.TokenRightBracket:
return la, nil
default:
return nil, fmt.Errorf("Expected json key identity but got: %v", pg.Cur().String())
}
switch pg.Cur().T {
case lex.TokenComma:
pg.Next()
case lex.TokenRightBracket:
pg.Next() // Consume the right ]
return la, nil
default:
return nil, fmt.Errorf("Expected json comma or end of array ] but got: %v", pg.Cur().String())
}
}
return la, nil
}
func parseJsonKeyValue(pg expr.TokenPager, jh u.JsonHelper) error {
if pg.Cur().T != lex.TokenIdentity {
return fmt.Errorf("Expected json key/identity but got: %v", pg.Cur().String())
}
key := pg.Cur().V
pg.Next()
//u.Debug(key, " ", pg.Cur())
switch pg.Cur().T {
case lex.TokenColon:
pg.Next()
switch pg.Cur().T {
case lex.TokenLeftBrace: // {
obj := make(u.JsonHelper)
if err := ParseJsonObject(pg, obj); err != nil {
return err
}
jh[key] = obj
case lex.TokenLeftBracket: // [
list, err := ParseJsonArray(pg)
if err != nil {
return err
}
//u.Debugf("list after: %#v", list)
jh[key] = list
case lex.TokenValue:
jh[key] = pg.Cur().V
pg.Next()
case lex.TokenBool:
bv, err := strconv.ParseBool(pg.Cur().V)
if err != nil {
return err
}
jh[key] = bv
pg.Next()
case lex.TokenInteger:
iv, err := strconv.ParseInt(pg.Cur().V, 10, 64)
if err != nil {
return err
}
jh[key] = iv
pg.Next()
case lex.TokenFloat:
fv, err := strconv.ParseFloat(pg.Cur().V, 64)
if err != nil {
return err
}
jh[key] = fv
pg.Next()
default:
u.Warnf("got unexpected token: %s", pg.Cur())
return fmt.Errorf("Expected json { or [ but got: %v", pg.Cur().T.String())
}
//u.Debug(key, " ", pg.Cur())
return nil
default:
return fmt.Errorf("Expected json colon but got: %v", pg.Cur().String())
}
return fmt.Errorf("Unreachable json error: %v", pg.Cur().String())
}