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value_tuple_str_char.go
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/
value_tuple_str_char.go
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package rel //nolint:dupl
import (
"fmt"
"reflect"
"github.com/arr-ai/hash"
"github.com/arr-ai/wbnf/parser"
)
// StringCharTuple represents a tuple of the form (@: at, @char: char).
type StringCharTuple struct {
at int
char rune
}
// NewStringCharTuple constructs a CharTuple.
func NewStringCharTuple(at int, char rune) StringCharTuple {
return StringCharTuple{at: at, char: char}
}
func newCharTupleFromTuple(t Tuple) (StringCharTuple, bool) {
var at int
var char rune
m := NewTupleMatcher(
map[string]Matcher{
"@": MatchInt(func(i int) { at = i }),
StringCharAttr: MatchInt(func(i int) { char = rune(i) }),
},
Lit(EmptyTuple),
)
if m.Match(t) {
return NewStringCharTuple(at, char), true
}
return StringCharTuple{}, false
}
func maybeNewCharTupleFromTuple(t Tuple) Tuple {
if t, ok := newCharTupleFromTuple(t); ok {
return t
}
return t
}
func (t StringCharTuple) asGenericTuple() Tuple {
return newTuple(
NewIntAttr("@", t.at),
NewIntAttr(StringCharAttr, int(t.char)),
)
}
// Hash computes a hash for a CharTuple.
func (t StringCharTuple) Hash(seed uintptr) uintptr {
h := hash.Int(t.at, seed)
return hash.Int32(t.char, h)
}
// Equal tests two Tuples for equality. Any other type returns false.
func (t StringCharTuple) Equal(v interface{}) bool {
if u, ok := v.(StringCharTuple); ok {
return t == u
}
return false
}
// String returns a string representation of a Tuple.
func (t StringCharTuple) String() string {
return fmt.Sprintf("(@: %d, %s: %d)", t.at, StringCharAttr, t.char)
}
// Eval returns the tuple.
func (t StringCharTuple) Eval(local Scope) (Value, error) {
return t, nil
}
// Source returns a scanner locating the StringCharTuple's source code.
func (t StringCharTuple) Source() parser.Scanner {
return *parser.NewScanner("")
}
var stringCharTupleKind = registerKind(301, reflect.TypeOf((*StringCharTuple)(nil)))
// Kind returns a number that is unique for each major kind of Value.
func (t StringCharTuple) Kind() int {
return stringCharTupleKind
}
// Bool returns true iff the tuple has attributes.
func (t StringCharTuple) IsTrue() bool {
return true
}
// Less returns true iff v is not a number or tuple, or v is a tuple and t
// precedes v in a lexicographical comparison of their name/value pairs.
func (t StringCharTuple) Less(v Value) bool {
if t.Kind() != v.Kind() {
return t.Kind() < v.Kind()
}
u := v.(StringCharTuple)
if t.at != u.at {
return t.at < u.at
}
return t.char < u.char
}
func (t StringCharTuple) Negate() Value {
return StringCharTuple{at: -t.at, char: -t.char}
}
// Export exports a Tuple.
func (t StringCharTuple) Export() interface{} {
return map[string]interface{}{
"@": t.at,
StringCharAttr: t.char,
}
}
// Count returns how many attributes are in the Tuple.
func (t StringCharTuple) Count() int {
return 2
}
// Get returns the Value associated with a name, and true iff it was found.
func (t StringCharTuple) Get(name string) (Value, bool) {
switch name {
case "@":
return NewNumber(float64(t.at)), true
case StringCharAttr:
return NewNumber(float64(t.char)), true
}
return nil, false
}
// MustGet returns e.Get(name) or panics if an error occurs.
func (t StringCharTuple) MustGet(name string) Value {
if v, has := t.Get(name); has {
return v
}
panic(fmt.Errorf("%q not found", name))
}
// With returns a Tuple with all name/Value pairs in t (except the one for the
// given name, if present) with the addition of the given name/Value pair.
func (t StringCharTuple) With(name string, value Value) Tuple {
return maybeNewCharTupleFromTuple(t.asGenericTuple().With(name, value))
}
// Without returns a Tuple with all name/Value pairs in t exception the one of
// the given name.
func (t StringCharTuple) Without(name string) Tuple {
if name == "@" || name == StringCharAttr {
return t.asGenericTuple().Without(name)
}
return t
}
func (t StringCharTuple) Map(f func(Value) Value) Tuple {
at := f(NewNumber(float64(t.at)))
char := f(NewNumber(float64(t.char)))
if at, ok := at.(Number); ok {
if at, is := at.Int(); is {
if char, ok := char.(Number); ok {
if char, is := char.Int(); is {
return NewStringCharTuple(at, rune(char))
}
}
}
}
return t.asGenericTuple().Map(f)
}
// HasName returns true iff the Tuple has an attribute with the given name.
func (t StringCharTuple) HasName(name string) bool {
return name == "@" || name == StringCharAttr
}
// Names returns the attribute names.
func (t StringCharTuple) Names() Names {
return NewNames("@", StringCharAttr)
}
// Project returns a tuple with the given names from this tuple, or nil if any
// name wasn't found.
func (t StringCharTuple) Project(names Names) Tuple {
if names.Has("@") && names.Has(StringCharAttr) {
return t
}
return t.asGenericTuple().Project(names)
}
// Enumerator returns an enumerator over the Values in the CharTuple.
func (t StringCharTuple) Enumerator() AttrEnumerator {
return &stringCharTupleEnumerator{t: t, i: -1}
}
type stringCharTupleEnumerator struct {
t StringCharTuple
i int
name string
value Value
}
func (e *stringCharTupleEnumerator) MoveNext() bool {
if e.i == 1 {
return false
}
e.i++
switch e.i {
case 0:
e.name = "@"
e.value = NewNumber(float64(e.t.at))
case 1:
e.name = StringCharAttr
e.value = NewNumber(float64(e.t.char))
}
return true
}
func (e *stringCharTupleEnumerator) Current() (string, Value) {
return e.name, e.value
}