github.com/Rookout/GoSDK@v0.1.48/pkg/processor/paths/arithmetic_path.go (about)

     1  package paths
     2  
     3  import (
     4  	"fmt"
     5  	"github.com/Rookout/GoSDK/pkg/processor/namespaces"
     6  	"github.com/Rookout/GoSDK/pkg/rookoutErrors"
     7  	"go/token"
     8  	"strings"
     9  )
    10  
    11  type Path interface {
    12  	ReadFrom(rootNamespace namespaces.Namespace) (namespaces.Namespace, rookoutErrors.RookoutError)
    13  	WriteTo(rootNamespace namespaces.Namespace, value namespaces.Namespace) rookoutErrors.RookoutError
    14  }
    15  
    16  type ArithmeticPath struct {
    17  	operations      node
    18  	writeOperations []pathOperation
    19  	negation        bool
    20  }
    21  
    22  func NewArithmeticPath(configuration interface{}) (*ArithmeticPath, rookoutErrors.RookoutError) {
    23  	var configStr string
    24  	switch configuration.(type) {
    25  	case string:
    26  		configStr = configuration.(string)
    27  	case map[string]interface{}:
    28  		configMap := configuration.(map[string]interface{})
    29  		path, ok := configMap["path"]
    30  		if !ok || path == nil {
    31  			return nil, rookoutErrors.NewRookInvalidArithmeticPathException(configuration, nil)
    32  		}
    33  
    34  		configStr, ok = path.(string)
    35  		if !ok {
    36  			return nil, rookoutErrors.NewRookInvalidArithmeticPathException(configuration, nil)
    37  		}
    38  	default:
    39  		return nil, rookoutErrors.NewRookInvalidArithmeticPathException(configuration, nil)
    40  	}
    41  
    42  	arithmeticPath := &ArithmeticPath{
    43  		negation: false,
    44  	}
    45  
    46  	if strings.HasPrefix(configStr, "NOT(") && strings.HasSuffix(configStr, ")") {
    47  		arithmeticPath.negation = true
    48  		configStr = configStr[len("NOT(") : len(configStr)-len(")")]
    49  	}
    50  
    51  	mapsActions, err := newMapsActions()
    52  	if err != nil {
    53  		return nil, err
    54  	}
    55  	arithmeticPath.operations, err = mapsActions.Parse(configStr)
    56  	if err != nil {
    57  		return nil, err
    58  	}
    59  	arithmeticPath.writeOperations = mapsActions.GetWriteOperations()
    60  
    61  	return arithmeticPath, nil
    62  }
    63  
    64  func (a ArithmeticPath) ReadFrom(rootNamespace namespaces.Namespace) (namespaces.Namespace, rookoutErrors.RookoutError) {
    65  	var res valueNode
    66  	var err rookoutErrors.RookoutError
    67  	if operations, ok := a.operations.(executableNode); ok {
    68  		res, err = operations.Execute(rootNamespace)
    69  		if err != nil {
    70  			return nil, err
    71  		}
    72  	} else {
    73  		res = a.operations.(valueNode)
    74  	}
    75  
    76  	switch res.(type) {
    77  	case *namespaceResultNode:
    78  		return res.(*namespaceResultNode).namespace, nil
    79  	default:
    80  		val := res.Interface()
    81  		if _, ok := val.(bool); ok && a.negation {
    82  			val = !val.(bool)
    83  		}
    84  		return namespaces.NewGoObjectNamespace(val), nil
    85  	}
    86  }
    87  
    88  func (a ArithmeticPath) WriteTo(namespace namespaces.Namespace, value namespaces.Namespace) rookoutErrors.RookoutError {
    89  	if operations, ok := a.operations.(executableNode); ok {
    90  		_, _ = operations.Execute(namespace)
    91  	}
    92  
    93  	var rookErr rookoutErrors.RookoutError
    94  	for _, op := range a.writeOperations[:len(a.writeOperations)-1] {
    95  		namespace, rookErr = op.Read(namespace, true)
    96  		if rookErr != nil {
    97  			return rookErr
    98  		}
    99  	}
   100  
   101  	lastOp := a.writeOperations[len(a.writeOperations)-1]
   102  	lastWriteOp, ok := lastOp.(writeOperation)
   103  	if !ok {
   104  		msg := fmt.Sprintf("last operation is not writable: %v (%#v)", lastOp, lastOp)
   105  		return rookoutErrors.NewRookInvalidArithmeticPathException(msg, nil)
   106  	}
   107  	rookErr = lastWriteOp.Write(namespace, value)
   108  	if rookErr != nil {
   109  		return rookErr
   110  	}
   111  
   112  	return nil
   113  }
   114  
   115  type optLevel uint32
   116  
   117  
   118  const (
   119  	MULDIV        optLevel = 0
   120  	ADDSUB        optLevel = 1
   121  	COMP          optLevel = 2
   122  	IN            optLevel = 3
   123  	AND           optLevel = 4
   124  	OR            optLevel = 5
   125  	NUM_OF_LEVELS optLevel = 6
   126  )
   127  
   128  var optLevelToStr = map[optLevel][]string{
   129  	MULDIV: {"*", "/"},
   130  	ADDSUB: {"+", "-"},
   131  	COMP:   {"<=", ">=", "!=", "=", "==", ">", "<", "LT", "GT", "LE", "GE", "EQ", "NE", "lt", "gt", "le", "ge", "eq", "ne"},
   132  	IN:     {"IN", "in"},
   133  	AND:    {"&&"},
   134  	OR:     {"||"},
   135  }
   136  
   137  var ArithmeticExpressions = map[string]string{
   138  	"NE": "!=",
   139  	"=":  "==",
   140  	"EQ": "==",
   141  	"LT": "<",
   142  	"GT": ">",
   143  	"GE": ">=",
   144  	"LE": "<=",
   145  	"IN": "in",
   146  
   147  	"AND": "&&",
   148  	"OR":  "||",
   149  }
   150  
   151  var strToToken = map[string]token.Token{
   152  	"+":  token.ADD,
   153  	"-":  token.SUB,
   154  	"*":  token.MUL,
   155  	"/":  token.QUO,
   156  	"&&": token.LAND,
   157  	"||": token.LOR,
   158  	"<=": token.LEQ,
   159  	">=": token.GEQ,
   160  	"!=": token.NEQ,
   161  	"=":  token.EQL,
   162  	"==": token.EQL,
   163  	">":  token.GTR,
   164  	"<":  token.LSS,
   165  }