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expr_seqmap.go
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/
expr_seqmap.go
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package rel
import (
"fmt"
"github.com/arr-ai/wbnf/parser"
"github.com/go-errors/errors"
)
// SeqArrowExpr returns the tuple applied to a function.
type SeqArrowExpr struct {
ExprScanner
lhs Expr
fn *Function
withAt bool
op string
}
// NewSequenceMapExpr returns a new SequenceMapExpr.
func NewSeqArrowExpr(withAt bool) func(scanner parser.Scanner, lhs Expr, fn Expr) Expr {
op := ">>"
if withAt {
op = ">>>"
}
return func(scanner parser.Scanner, lhs Expr, fn Expr) Expr {
return &SeqArrowExpr{
ExprScanner: ExprScanner{scanner},
lhs: lhs,
fn: ExprAsFunction(fn),
withAt: withAt,
op: op,
}
}
}
// String returns a string representation of the expression.
func (e *SeqArrowExpr) String() string {
return fmt.Sprintf("(%s >> %s)", e.lhs, e.fn)
}
// Eval returns the lhs
func (e *SeqArrowExpr) Eval(local Scope) (_ Value, err error) {
value, err := e.lhs.Eval(local)
if err != nil {
return nil, WrapContext(err, e, local)
}
var closure Set = NewClosure(local, e.fn)
var call func(at, v Value) (Value, error)
if e.withAt {
call = func(at, v Value) (Value, error) {
s, err := SetCall(closure, at)
if err != nil {
return nil, WrapContext(err, e, local)
}
return SetCall(s.(Set), v)
}
} else {
call = func(_, v Value) (Value, error) {
return SetCall(closure, v)
}
}
switch value := value.(type) {
case String: //nolint:dupl
runes := make([]rune, len(value.s))
for at, char := range value.s {
newChar, err := call(NewNumber(float64(value.offset+at)), NewNumber(float64(char)))
if err != nil {
return nil, WrapContext(err, e, local)
}
if n, is := newChar.(Number); is {
if r := rune(n.Float64()); float64(r) == n.Float64() {
runes[at] = r
continue
}
}
return nil, WrapContext(fmt.Errorf("string %s ... must produce valid chars", e.op), e, local)
}
return NewOffsetString(runes, value.offset), nil
case Bytes: //nolint:dupl
bytes := make([]byte, len(value.b))
for at, byt := range value.b {
newByte, err := call(NewNumber(float64(value.offset+at)), NewNumber(float64(byt)))
if err != nil {
return nil, WrapContext(err, e, local)
}
if n, is := newByte.(Number); is {
if b := byte(n.Float64()); float64(b) == n.Float64() {
bytes[at] = b
continue
}
}
return nil, WrapContext(fmt.Errorf("bytes %s ... must produce valid bytes", e.op), e, local)
}
return NewOffsetBytes(bytes, value.offset), nil
case Array:
items := make([]Value, len(value.values))
for at, item := range value.values {
if item != nil {
items[at], err = call(NewNumber(float64(value.offset+at)), item)
if err != nil {
return nil, WrapContext(err, e, local)
}
}
}
return NewOffsetArray(value.offset, items...), nil
case Dict:
entries := make([]DictEntryTuple, 0, value.m.Count())
for i := value.Enumerator(); i.MoveNext(); {
entry := i.Current().(DictEntryTuple)
newValue, err := call(entry.at, entry.value)
if err != nil {
return nil, WrapContext(err, e, local)
}
entries = append(entries, NewDictEntryTuple(entry.at, newValue))
}
return NewDict(true, entries...), nil
case Set:
values := []Value{}
for i := value.Enumerator(); i.MoveNext(); {
t := i.Current().(Tuple)
at, has := t.Get("@")
if !has {
return nil, WrapContext(errors.Errorf("%s not applicable to unindexed type %v", e.op, value), e, local)
}
attr := t.Names().Without("@").Any()
item, _ := t.Get(attr)
newItem, err := call(at, item)
if err != nil {
return nil, WrapContext(err, e, local)
}
values = append(values, NewTuple(Attr{"@", at}, Attr{attr, newItem}))
}
return NewSet(values...), nil
}
return nil, WrapContext(errors.Errorf("%s not applicable to %T", e.op, value), e, local)
}