ValueTypeFromNode Infer Value type from Node
(n Node)
| 481 | |
| 482 | // ValueTypeFromNode Infer Value type from Node |
| 483 | func ValueTypeFromNode(n Node) value.ValueType { |
| 484 | switch nt := n.(type) { |
| 485 | case *FuncNode: |
| 486 | if nt == nil { |
| 487 | return value.UnknownType |
| 488 | } |
| 489 | if nt.F.CustomFunc == nil { |
| 490 | return value.UnknownType |
| 491 | } |
| 492 | return nt.F.Type() |
| 493 | case *StringNode: |
| 494 | return value.StringType |
| 495 | case *IdentityNode: |
| 496 | // Identity types will draw type from context. |
| 497 | return value.UnknownType |
| 498 | case *NumberNode: |
| 499 | return value.NumberType |
| 500 | case *BooleanNode: |
| 501 | return value.BoolType |
| 502 | case *BinaryNode: |
| 503 | switch nt.Operator.T { |
| 504 | case lex.TokenLogicAnd, lex.TokenAnd, lex.TokenLogicOr, lex.TokenOr, |
| 505 | lex.TokenEqual, lex.TokenEqualEqual: |
| 506 | return value.BoolType |
| 507 | case lex.TokenMultiply, lex.TokenMinus, lex.TokenAdd, lex.TokenDivide: |
| 508 | return value.NumberType |
| 509 | case lex.TokenModulus: |
| 510 | return value.IntType |
| 511 | case lex.TokenLT, lex.TokenLE, lex.TokenGT, lex.TokenGE: |
| 512 | return value.BoolType |
| 513 | } |
| 514 | } |
| 515 | return value.UnknownType |
| 516 | } |
| 517 | |
| 518 | // NewFuncNode create new Function Expression Node. |
| 519 | func NewFuncNode(name string, f Func) *FuncNode { |