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ast.go
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ast.go
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package golang
import (
"github.com/jaksonlin/go-jsonextend/ast"
"github.com/jaksonlin/go-jsonextend/astbuilder"
"github.com/jaksonlin/go-jsonextend/token"
)
type astGolangConstructor struct {
ast *ast.JsonextAST
}
var _ astbuilder.ASTStateManagement = (*astGolangConstructor)(nil)
var _ astbuilder.NodeConstructor = (*astGolangConstructor)(nil)
func newASTConstructor() *astGolangConstructor {
return &astGolangConstructor{
ast: ast.NewJsonextAST(),
}
}
// when a json symbol is read, push it to syntax checker and construct the AST stack elements (as described in ast.go)
func (i *astGolangConstructor) RecordSyntaxSymbol(b token.TokenType) error {
//routing base on symbol
switch b {
case token.TOKEN_LEFT_BRACE:
_, err := i.ast.CreateNewASTNode(ast.AST_OBJECT, nil)
return err
case token.TOKEN_LEFT_BRACKET:
_, err := i.ast.CreateNewASTNode(ast.AST_ARRAY, nil)
return err
case token.TOKEN_RIGHT_BRACKET:
fallthrough
case token.TOKEN_RIGHT_BRACE:
_, err := i.ast.EncloseLatestElements()
if err != nil {
return err
}
default:
return ErrorIncorrectSyntaxSymbolForConstructAST
}
return nil
}
func (i *astGolangConstructor) CreateNodeWithValue(valueType ast.AST_NODETYPE, nodeValue interface{}) (ast.JsonNode, error) {
return i.ast.CreateNewASTNode(valueType, nodeValue)
}
func (i *astGolangConstructor) GetAST() ast.JsonNode {
return i.ast.GetAST()
}
func (i *astGolangConstructor) HasComplete() bool {
return i.ast.HasComplete()
}
func (i *astGolangConstructor) TopElementType() (ast.AST_NODETYPE, error) {
return i.ast.TopElementType()
}
func (i *astGolangConstructor) HasOpenElements() bool {
return i.ast.HasOpenElement()
}