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expr.go
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expr.go
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package script
import (
"fmt"
"github.com/project-flogo/core/data/expression"
"github.com/project-flogo/core/data/expression/script/gocc/ast"
"github.com/project-flogo/core/data/expression/script/gocc/errors"
"github.com/project-flogo/core/data/expression/script/gocc/lexer"
"github.com/project-flogo/core/data/expression/script/gocc/parser"
"github.com/project-flogo/core/data/resolve"
_ "github.com/project-flogo/core/data/expression/function/builtin"
)
func init() {
expression.SetScriptFactoryCreator(NewExprFactory)
}
func NewExprFactory(resolver resolve.CompositeResolver) expression.Factory {
return &factoryImpl{resolver: resolver}
}
type factoryImpl struct {
resolver resolve.CompositeResolver
}
func (f *factoryImpl) NewExpr(exprStr string) (expression.Expr, error) {
st, err := parse(exprStr)
if err != nil {
if gerr, ok := err.(*errors.Error); ok {
if gerr.Err != nil {
return nil, gerr.Err
}
//log details in debug
return nil, fmt.Errorf("error parsing expression")
}
return nil, err
}
expr, ok := st.(ast.Expr)
if ok {
err := expr.Init(f.resolver, true)
if err != nil {
return nil, err
}
return expr, nil
}
return nil, fmt.Errorf("error parsing expression")
}
func parse(scriptExpr string) (interface{}, error) {
lex := lexer.NewLexer([]byte(scriptExpr))
p := parser.NewParser()
st, err := p.Parse(lex)
return st, err
}