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filterExprParser.go
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filterExprParser.go
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// Copyright 2018-2019 Couchbase, Inc. All rights reserved.
package gojsonsm
import (
"fmt"
"github.com/alecthomas/participle"
"math"
"strings"
)
// EBNF Grammar describing the parser
// FilterExpression = InnerExpression
// InnerExpression = InnerAndExpression { "OR" InnerAndExpression }
// InnerAndExpression = SubExprOrTerm { "AND" SubExprOrTerm }
// SubExprOrTerm = "(" InnerExpression ")" | Condition
// Condition = ( [ "NOT" ] Condition ) | Operand
// Operand = BooleanExpr | ( LHS ( CheckOp | ( CompareOp RHS) ) )
// BooleanExpr = Boolean | BooleanFuncExpr
// LHS = ConstFuncExpr | Boolean | FieldWithMath | Value
// RHS = ConstFuncExpr | Boolean | Value | FieldWithMath
// CompareOp = "=" | "==" | "<>" | "!=" | ">" | ">=" | "<" | "<="
// CheckOp = ( "IS" [ "NOT" ] ( NULL | MISSING ) )
// FieldWithMath = FieldWMathType0 | FieldWMathType1
// FieldWMathType0 = MathValue MathOp Field
// FieldWMathType1 = Field { MathOp ( MathValue | Field ) }
// Field = { @"-" } OnePath { "." OnePath }
// OnePath = ( PathFuncExpression | StringType ){ ArrayIndex }
// StringType = @Ident | @RawString | @Char
// ArrayIndex = "[" @Int "]"
// Value = @MathValue | @String
// ConstFuncExpr = { @"-" } ( ConstFuncNoArg | ConstFuncOneArg | ConstFuncTwoArgs )
// ConstFuncNoArg = ConstFuncNoArgName "(" ")"
// ConstFuncNoArgName = "PI" | "E"
// ConstFuncOneArg = ConstFuncOneArgName "(" ConstFuncArgument ")"
// ConstFuncOneArgName = "ABS" | "ACOS"...
// ConstFuncTwoArgs = ConstFuncTwoArgsName "(" ConstFuncArgument "," ConstFuncArgument ")"
// ConstFuncTwoArgsName = "ATAN2" | "POW"
// ConstFuncArgument = FieldWithMath | Value | ConstFuncExpr
// ConstFuncArgumentRHS = Value
// PathFuncExpression = OnePathFuncNoArg
// OnePathFuncNoArg = OnePathFuncNoArgName "(" ")"
// MathOp = @"+" | @"-" | @"*" | @"/" | @"%"
// MathValue = { @"-" } ( @Int | @Float )
// OnePathFuncNoArgName = "META"
// BooleanFuncExpr = BooleanFuncTwoArgs | ExistsClause
// BooleanFuncTwoArgs = BooleanFuncTwoArgsName "(" ConstFuncArgument "," ConstFuncArgumentRHS ")"
// BooleanFuncTwoArgsName = "REGEXP_CONTAINS"
// ExistsClause = ( "EXISTS" "(" Field ")" )
type FilterExpression struct {
FilterExpr *FEInnerExpression `@@`
}
func (f *FilterExpression) String() string {
if f.FilterExpr != nil {
return f.FilterExpr.String()
} else {
return "Invalid FilterExpression"
}
}
func (f *FilterExpression) OutputExpression() (Expression, error) {
if f.FilterExpr != nil {
return f.FilterExpr.OutputExpression()
} else {
return nil, fmt.Errorf("Invalid FilterExpression")
}
}
type FEInnerExpression struct {
Expr []*FEInnerAndExpression `@@ { "OR" @@ }`
}
func (f *FEInnerExpression) String() string {
var output []string
if f.Expr == nil {
return ""
}
for _, expr := range f.Expr {
output = append(output, expr.String())
}
return strings.Join(output, " OR ")
}
func (f *FEInnerExpression) OutputExpression() (Expression, error) {
var outExpr OrExpr
if f.Expr == nil {
return nil, fmt.Errorf("Invalid FEInnerExpression")
}
for _, exprWrapper := range f.Expr {
expr, err := exprWrapper.OutputExpression()
if err != nil {
return nil, err
}
outExpr = append(outExpr, expr)
}
return outExpr, nil
}
type FEInnerAndExpression struct {
Expr []*FESubExprOrTerm `@@ { "AND" @@ }`
}
func (f *FEInnerAndExpression) String() string {
var output []string
if f.Expr == nil {
return ""
}
for _, expr := range f.Expr {
output = append(output, expr.String())
}
return strings.Join(output, " AND ")
}
func (f *FEInnerAndExpression) OutputExpression() (Expression, error) {
var outExpr AndExpr
if f.Expr == nil {
return nil, fmt.Errorf("Invalid FEInnerAndExpression")
}
for _, exprWrapper := range f.Expr {
expr, err := exprWrapper.OutputExpression()
if err != nil {
return nil, err
}
outExpr = append(outExpr, expr)
}
return outExpr, nil
}
type FESubExprOrTerm struct {
SubExpr *FEInnerExpression `( "(" @@ ")" |`
Expr *FECondition `@@ )`
}
func (f *FESubExprOrTerm) String() string {
if f.SubExpr != nil {
return fmt.Sprintf("%v %v %v", "(", f.SubExpr.String(), ")")
} else if f.Expr != nil {
return f.Expr.String()
} else {
return "?? (FESubExprOrTerm)"
}
}
func (f *FESubExprOrTerm) OutputExpression() (Expression, error) {
if f.SubExpr != nil {
return f.SubExpr.OutputExpression()
} else if f.Expr != nil {
return f.Expr.OutputExpression()
} else {
return nil, fmt.Errorf("Invalid FESubExprOrTerm")
}
}
type FEAndConditionWrapper struct {
SubExpr *FEAndCondition `( "(" @@ ")" |`
Expr *FEAndCondition `@@ )`
}
func (f *FEAndConditionWrapper) String() string {
if f.SubExpr != nil {
return fmt.Sprintf("%v %v %v", "(", f.SubExpr.String(), ")")
} else if f.Expr != nil {
return f.Expr.String()
} else {
return "?? (FEAndConditionWrapper)"
}
}
func (f *FEAndConditionWrapper) OutputExpression() (Expression, error) {
if f.SubExpr != nil {
return f.SubExpr.OutputExpression()
} else if f.Expr != nil {
return f.Expr.OutputExpression()
} else {
return nil, fmt.Errorf("Invalid FEAndConditionWrapper")
}
}
type FEAndCondition struct {
OrConditions []*FESubExprOrTerm `@@ { "AND" @@ }`
}
func (ac *FEAndCondition) String() string {
output := []string{}
first := true
for _, e := range ac.OrConditions {
if first {
first = false
} else {
output = append(output, OperatorAnd)
}
output = append(output, e.String())
}
return strings.Join(output, " ")
}
func (f *FEAndCondition) OutputExpression() (Expression, error) {
var outExpr AndExpr
for _, oneExpr := range f.OrConditions {
expr, err := oneExpr.OutputExpression()
if err != nil {
return outExpr, err
}
outExpr = append(outExpr, expr)
}
return outExpr, nil
}
type FECondition struct {
Not *FECondition `"NOT" @@`
Operand *FEOperand `| @@`
}
func (fec *FECondition) String() string {
var outputStr []string
if fec.Not != nil {
outputStr = append(outputStr, fmt.Sprintf("%v %v", OperatorNot, fec.Not.String()))
} else if fec.Operand != nil {
outputStr = append(outputStr, fec.Operand.String())
} else {
outputStr = append(outputStr, "?? (FECondition)")
}
return strings.Join(outputStr, " ")
}
func (f *FECondition) OutputExpression() (Expression, error) {
if f.Not != nil {
subNot, err := f.Not.OutputExpression()
return NotExpr{subNot}, err
} else if f.Operand != nil {
return f.Operand.OutputExpression()
} else {
return nil, fmt.Errorf("Invalid FECondition %v", f.String())
}
}
type FEOperand struct {
BooleanExpr *FEBooleanExpr `@@ |`
LHS *FELhs `( @@ (`
Op *FECompareOp `( @@`
RHS *FERhs `@@ ) | `
CheckOp *FECheckOp `@@ ) )`
}
func (feo *FEOperand) String() string {
if feo.BooleanExpr != nil {
return feo.BooleanExpr.String()
} else if feo.LHS != nil && feo.CheckOp != nil {
return fmt.Sprintf("%v %v", feo.LHS.String(), feo.CheckOp.String())
} else if feo.LHS != nil && feo.Op != nil && feo.RHS != nil {
return fmt.Sprintf("%v %v %v", feo.LHS.String(), feo.Op.String(), feo.RHS.String())
} else {
return "?? (FEOperand)"
}
}
func (f *FEOperand) OutputExpression() (Expression, error) {
if f.BooleanExpr != nil {
return f.BooleanExpr.OutputExpression()
} else if f.LHS != nil {
lhsExpr, err := f.LHS.OutputExpression()
if err != nil {
return nil, err
}
if f.CheckOp != nil {
outExpr, err := f.CheckOp.OutputExpression(lhsExpr)
return outExpr, err
} else if f.Op != nil && f.RHS != nil {
rhsExpr, err := f.RHS.OutputExpression()
if err != nil {
return nil, err
}
return f.Op.OutputExpression(lhsExpr, rhsExpr)
} else {
return nil, fmt.Errorf("Invalid FEOperand %v", f.String())
}
} else {
return nil, fmt.Errorf("Invalid FEOperand %v", f.String())
}
}
type FEBooleanExpr struct {
BooleanVal *FEBoolean `@@ |`
BooleanFunc *FEBooleanFuncExpr `@@`
}
func (be *FEBooleanExpr) String() string {
if be.BooleanVal != nil {
return be.BooleanVal.String()
} else if be.BooleanFunc != nil {
return be.BooleanFunc.String()
} else {
return "?? (FEBooleanExpr)"
}
}
func (f *FEBooleanExpr) OutputExpression() (Expression, error) {
if f.BooleanVal != nil {
return f.BooleanVal.OutputExpression(false /*asValue*/)
} else if f.BooleanFunc != nil {
return f.BooleanFunc.OutputExpression()
}
return nil, fmt.Errorf("Invalid FEBooleanExpr %v", f.String())
}
type FEBoolean struct {
TVal *bool `@"TRUE" |`
TVal1 *bool `@"true" |`
FVal *bool `@"FALSE" |`
FVal1 *bool `@"false"`
}
func (feb *FEBoolean) String() string {
if feb.TVal != nil && *feb.TVal == true {
return fmt.Sprintf("%v(bool)", OperatorTrue)
} else if feb.TVal1 != nil && *feb.TVal1 == true {
return fmt.Sprintf("%v(bool)", strings.ToLower(OperatorTrue))
} else if feb.FVal != nil && *feb.FVal == true {
return fmt.Sprintf("%v(bool)", OperatorFalse)
} else if feb.FVal1 != nil && *feb.FVal1 == true {
return fmt.Sprintf("%v(bool)", strings.ToLower(OperatorFalse))
}
return ""
}
// Should use IsSet() to make sure it's first set
func (feb *FEBoolean) GetBool() bool {
if feb.TVal != nil && *feb.TVal == true {
return true
} else if feb.TVal1 != nil && *feb.TVal1 == true {
return true
} else if feb.FVal != nil && *feb.FVal == true {
return false
} else if feb.FVal1 != nil && *feb.FVal1 == true {
return false
}
return false
}
func (feb *FEBoolean) IsSet() bool {
return feb.TVal != nil || feb.TVal1 != nil || feb.FVal != nil || feb.FVal1 != nil
}
func (f *FEBoolean) OutputExpression(asValue bool) (Expression, error) {
if !f.IsSet() {
return nil, fmt.Errorf("Invalid FEBoolean (not set)")
}
if f.GetBool() == true {
if asValue {
return ValueExpr{true}, nil
} else {
return TrueExpr{}, nil
}
} else {
if asValue {
return ValueExpr{false}, nil
} else {
return FalseExpr{}, nil
}
}
}
type FELhs struct {
Func *FEConstFuncExpression `( @@ |`
Bool *FEBoolean `@@ |`
FieldWMath *FEFieldWithMath `@@ |`
Value *FEValue `@@ )`
}
func (fel *FELhs) String() string {
if fel.FieldWMath != nil {
return fel.FieldWMath.String()
} else if fel.Value != nil {
return fel.Value.String()
} else if fel.Func != nil {
return fel.Func.String()
} else if fel.Bool != nil {
return fel.Bool.String()
} else {
return "?? (FELhs)"
}
}
func (f *FELhs) OutputExpression() (Expression, error) {
if f.FieldWMath != nil {
return f.FieldWMath.OutputExpression()
} else if f.Value != nil {
return f.Value.OutputExpression()
} else if f.Func != nil {
return f.Func.OutputExpression()
} else if f.Bool != nil {
return f.Bool.OutputExpression(true /* asValue */)
} else {
return nil, fmt.Errorf("Invalid FELhs %v", f.String())
}
}
// Normally users do values on the RHS, so prioritize it over field
type FERhs struct {
Func *FEConstFuncExpression `( @@ |`
Bool *FEBoolean `@@ |`
Value *FEValue `@@ |`
FieldWMath *FEFieldWithMath `@@ )`
}
func (fer *FERhs) String() string {
if fer.FieldWMath != nil {
return fer.FieldWMath.String()
} else if fer.Value != nil {
return fer.Value.String()
} else if fer.Func != nil {
return fer.Func.String()
} else if fer.Bool != nil {
return fer.Bool.String()
} else {
return "?? (FERhs)"
}
}
func (f *FERhs) OutputExpression() (Expression, error) {
if f.FieldWMath != nil {
return f.FieldWMath.OutputExpression()
} else if f.Value != nil {
return f.Value.OutputExpression()
} else if f.Func != nil {
return f.Func.OutputExpression()
} else if f.Bool != nil {
return f.Bool.OutputExpression(true /*asValue*/)
} else {
return nil, fmt.Errorf("Invalid FERhs %v", f.String())
}
}
type FEFieldWithMath struct {
Type0 *FEFieldWithMathType0 `@@ |`
Type1 *FEFieldWithMathType1 `@@ |`
FieldOnly *FEField `@@`
}
func (f *FEFieldWithMath) String() string {
if f.Type0 != nil {
return f.Type0.String()
} else if f.Type1 != nil {
return f.Type1.String()
} else {
return "?? (FEFieldWithMath)"
}
}
func (f *FEFieldWithMath) OutputExpression() (Expression, error) {
if f.Type0 != nil {
return f.Type0.OutputExpression()
} else if f.Type1 != nil {
return f.Type1.OutputExpression()
} else {
return nil, fmt.Errorf("Invalid FEFieldWithMath %v", f.String())
}
}
type FEFieldWithMathType0 struct {
MathValue *FEMathValue `( @@ `
MathOp *FEMathArithmeticOp `@@ `
Field *FEField `@@ )`
}
func (f *FEFieldWithMathType0) String() string {
if f.MathValue != nil && f.MathOp != nil && f.Field != nil {
output := []string{}
output = append(output, f.MathValue.String())
output = append(output, f.MathOp.String())
output = append(output, f.Field.String())
return strings.Join(output, " ")
} else {
return "?? (FEFieldWithMathType0)"
}
}
func (f *FEFieldWithMathType0) OutputExpression() (Expression, error) {
if f.MathOp != nil && f.MathValue != nil && f.Field != nil {
var mathOutExpr FuncExpr
mathOpExpr, err := f.MathOp.OutputExpression()
if err != nil {
return nil, err
}
mathOutExpr = mathOpExpr.(FuncExpr)
valueExpr, err := f.MathValue.OutputExpression()
if err != nil {
return nil, err
}
mathOutExpr.Params = append(mathOutExpr.Params, valueExpr)
fieldExpr, err := f.Field.OutputExpression()
if err != nil {
return nil, err
}
mathOutExpr.Params = append(mathOutExpr.Params, fieldExpr)
return mathOutExpr, nil
} else {
return nil, fmt.Errorf("Invalid FEFieldWithMathType0 %v", f.String())
}
}
type FEFieldWithMathType1 struct {
Field *FEField `( @@`
MathOp *FEMathArithmeticOp `{ @@`
MathValue *FEMathValue `( @@ | `
OtherField *FEField `@@ ) } )`
}
func (f *FEFieldWithMathType1) String() string {
output := []string{}
if f.Field != nil {
output = append(output, f.Field.String())
}
if f.MathValue != nil && (f.MathOp != nil || f.OtherField != nil) {
output = append(output, f.MathOp.String())
if f.MathOp != nil {
output = append(output, f.MathValue.String())
} else {
output = append(output, f.OtherField.String())
}
}
return strings.Join(output, " ")
}
func (f *FEFieldWithMathType1) OutputExpression() (Expression, error) {
if f.Field == nil {
return nil, fmt.Errorf("Invalid FEFieldWithMathType1 %v", f.String())
}
if f.MathOp != nil && (f.MathValue != nil || f.OtherField != nil) {
var mathOutExpr FuncExpr
mathOpExpr, err := f.MathOp.OutputExpression()
if err != nil {
return nil, err
}
mathOutExpr = mathOpExpr.(FuncExpr)
fieldExpr, err := f.Field.OutputExpression()
if err != nil {
return nil, err
}
mathOutExpr.Params = append(mathOutExpr.Params, fieldExpr)
if f.MathValue != nil {
valueExpr, err := f.MathValue.OutputExpression()
if err != nil {
return nil, err
}
mathOutExpr.Params = append(mathOutExpr.Params, valueExpr)
} else {
field2Expr, err := f.OtherField.OutputExpression()
if err != nil {
return nil, err
}
mathOutExpr.Params = append(mathOutExpr.Params, field2Expr)
}
return mathOutExpr, nil
} else {
// No math
return f.Field.OutputExpression()
}
}
type FEField struct {
MathNeg *bool `{ @"-" }`
Path []*FEOnePath `@@ { "." @@ }`
}
func (fef *FEField) String() string {
output := []string{}
for _, onePath := range fef.Path {
output = append(output, onePath.String())
}
fieldOutput := strings.Join(output, ".")
if fef.MathNeg != nil {
fieldOutput = fmt.Sprintf("%v%v", "-", fieldOutput)
}
return fieldOutput
}
func (f *FEField) OutputExpression() (Expression, error) {
var outExpr FieldExpr
for _, onePath := range f.Path {
pathName, arrays, err := onePath.OutputOnePath()
if err != nil {
return outExpr, err
}
outExpr.Path = append(outExpr.Path, pathName)
for _, arrIdx := range arrays {
outExpr.Path = append(outExpr.Path, arrIdx)
}
}
if f.MathNeg != nil {
var mathOutExpr FuncExpr
// Only thing is a negation of the field value
mathOutExpr.FuncName = MathFuncNeg
mathOutExpr.Params = append(mathOutExpr.Params, outExpr)
return mathOutExpr, nil
} else {
return outExpr, nil
}
}
type FEStringType struct {
CharVal string `( @Char |`
RawStr string `@RawString |`
StrValue string `@Ident )`
}
func (f *FEStringType) String() string {
if len(f.CharVal) > 0 {
return f.CharVal
} else if len(f.RawStr) > 0 {
return f.RawStr
} else if len(f.StrValue) > 0 {
return f.StrValue
} else {
return ""
}
}
type FEOnePath struct {
OnePathFunc *FEOnePathFuncExpr `( @@ |`
StrValue *FEStringType ` @@ )`
ArrayIndexes []*FEArrayIndex `{ @@ }`
}
func (feop *FEOnePath) String() string {
output := []string{}
if feop.OnePathFunc != nil {
output = append(output, feop.OnePathFunc.String())
} else if len(feop.StrValue.String()) > 0 {
output = append(output, feop.StrValue.String())
} else {
output = append(output, "")
}
for i := 0; i < len(feop.ArrayIndexes); i++ {
output = append(output, feop.ArrayIndexes[i].String())
}
return strings.Join(output, " ")
}
// Outputs a path, and an array of indexes, if there is any
func (f *FEOnePath) OutputOnePath() (string, []string, error) {
var arrayIdx []string
for _, arr := range f.ArrayIndexes {
arrayIdx = append(arrayIdx, arr.String())
}
if f.StrValue != nil {
return f.StrValue.String(), arrayIdx, nil
} else if f.OnePathFunc != nil {
return f.OnePathFunc.String(), arrayIdx, nil
} else {
return "", arrayIdx, fmt.Errorf("Invalid internal FEOnePath: %v", f.String())
}
}
type FEArrayIndex struct {
// For now we are not supporting negative indexes
// ArrayIndex string `"[" [ @"-" ] @Int "]"`
ArrayIndex string `"[" @Int "]"`
}
func (i *FEArrayIndex) String() string {
return fmt.Sprintf("[%v]", i.ArrayIndex)
}
type FEOnePathFuncExpr struct {
OnePathFuncNoArg *FEOnePathFuncNoArg `@@`
}
func (e *FEOnePathFuncExpr) String() string {
if e.OnePathFuncNoArg != nil {
return e.OnePathFuncNoArg.String()
} else {
return "?? FEOnePathFuncExpr"
}
}
type FEOnePathFuncNoArg struct {
OnePathFuncNoArgName *FEOnePathFuncNoArgName `( @@ "(" ")" )`
}
func (na *FEOnePathFuncNoArg) String() string {
if na.OnePathFuncNoArgName != nil {
return fmt.Sprintf("%v()", na.OnePathFuncNoArgName.String())
} else {
return "?? (FEOnePathFuncNoArg)"
}
}
type FEOnePathFuncNoArgName struct {
Meta *bool `@"META"`
}
func (n *FEOnePathFuncNoArgName) String() string {
if n.Meta != nil && *n.Meta == true {
return OperatorMeta
} else {
return "?? (FEOnePathFuncNoArgName)"
}
}
// There's currently no special Expression for META function, but it's useful to have a parser gramar for it
// as it is being used internally
func (f *FEOnePathFuncNoArgName) OutputExpression() (Expression, error) {
return nil, fmt.Errorf("Not supported (FEOnePathFuncNoArgName) %v", f.String())
}
type FEMathArithmeticOp struct {
Addition *bool `@"+" |`
Subtraction *bool `@"-" |`
Multiply *bool `@"*" |`
Division *bool `@"/" |`
Modulo *bool `@"%"`
}
func (f *FEMathArithmeticOp) String() string {
if f.Addition != nil {
return "+"
} else if f.Subtraction != nil {
return "-"
} else if f.Multiply != nil {
return "*"
} else if f.Division != nil {
return "/"
} else if f.Modulo != nil {
return "%"
} else {
return "?? (FEMathArithmeticOp)"
}
}
func (f *FEMathArithmeticOp) OutputExpression() (Expression, error) {
if f.Addition != nil {
return FuncExpr{FuncName: MathFuncAdd}, nil
} else if f.Subtraction != nil {
return FuncExpr{FuncName: MathFuncSub}, nil
} else if f.Multiply != nil {
return FuncExpr{FuncName: MathFuncMul}, nil
} else if f.Division != nil {
return FuncExpr{FuncName: MathFuncDiv}, nil
} else if f.Modulo != nil {
return FuncExpr{FuncName: MathFuncMod}, nil
} else {
return nil, fmt.Errorf("Invalid FEMathArithmeticOp %v", f.String())
}
}
type FEMathValue struct {
MathNeg *bool `{ @"-" }`
IntValue *int `( @Int |`
FloatValue *float64 `@Float )`
}
func (f *FEMathValue) String() string {
if f.IntValue != nil {
outputVal := *f.IntValue
if f.MathNeg != nil && *f.MathNeg {
outputVal *= -1
}
return fmt.Sprintf("%v", outputVal)
} else if f.FloatValue != nil {
outputVal := *f.FloatValue
if f.MathNeg != nil && *f.MathNeg {
outputVal *= -1
}
return fmt.Sprintf("%v", outputVal)
} else {
return "?? (FEMathValue)"
}
}
func (f *FEMathValue) OutputExpression() (Expression, error) {
if f.IntValue != nil {
outputVal := *f.IntValue
if f.MathNeg != nil && *f.MathNeg {
outputVal *= -1
}
return ValueExpr{outputVal}, nil
} else if f.FloatValue != nil {
outputVal := *f.FloatValue
if f.MathNeg != nil && *f.MathNeg {
outputVal *= -1
}
return ValueExpr{outputVal}, nil
} else {
return nil, fmt.Errorf("Invalid FEMathValue %v", f.String())
}
}
type FEValue struct {
MathVal *FEMathValue `@@ |`
StrValue *string `@String`
}
func (fev *FEValue) String() string {
if fev.StrValue != nil {
return *fev.StrValue
} else if fev.MathVal != nil {
return fev.MathVal.String()
} else {
return "?? (FEValue)"
}
}
func (f *FEValue) OutputExpression() (Expression, error) {
if f.StrValue != nil {
return ValueExpr{
*f.StrValue,
}, nil
} else if f.MathVal != nil {
return f.MathVal.OutputExpression()
} else {
return ValueExpr{}, fmt.Errorf("Invalid FEValue: %v", f.String())
}
}
// We have to do this funky way of matching because our FEOperand expression may not be composed of a compareOp
// And due to the complicated FEOperand op, we have to do char by char match so we can catch the not-matched case
// and go to the other type of operands
type FEOpChar struct {
Not *bool `( @"!" |`
Equal *bool `@"=" |`
LessThan *bool `@"<" |`
GreaterThan *bool `@">" )`
}
func (f *FEOpChar) String() string {
if f.Not != nil {
return "!"
} else if f.Equal != nil {
return "="
} else if f.LessThan != nil {
return "<"
} else if f.GreaterThan != nil {
return ">"
}
return ""
}
type FECompareOp struct {
OpChars0 *FEOpChar `@@`
OpChars1 *FEOpChar `[ @@ ]`
}
func (feo *FECompareOp) IsEqual() bool {
// =
singleEq := feo.OpChars0 != nil && feo.OpChars0.Equal != nil && feo.OpChars1 == nil
// ==
doubleEq := feo.OpChars0 != nil && feo.OpChars0.Equal != nil && feo.OpChars1 != nil && feo.OpChars1.Equal != nil
return singleEq || doubleEq
}
func (feo *FECompareOp) IsNotEqual() bool {
// !=
notEqual0 := feo.OpChars0 != nil && feo.OpChars0.Not != nil && feo.OpChars1 != nil && feo.OpChars1.Equal != nil
// <>
notEqual1 := feo.OpChars0 != nil && feo.OpChars0.LessThan != nil && feo.OpChars1 != nil && feo.OpChars1.GreaterThan != nil
return notEqual0 || notEqual1
}
func (feo *FECompareOp) IsGreaterThan() bool {
// >
return feo.OpChars0 != nil && feo.OpChars0.GreaterThan != nil && feo.OpChars1 == nil
}
func (feo *FECompareOp) IsGreaterThanOrEqualTo() bool {
// >=
return feo.OpChars0 != nil && feo.OpChars0.GreaterThan != nil && feo.OpChars1 != nil && feo.OpChars1.Equal != nil
}
func (feo *FECompareOp) IsLessThan() bool {
// <
return feo.OpChars0 != nil && feo.OpChars0.LessThan != nil && feo.OpChars1 == nil
}
func (feo *FECompareOp) IsLessThanOrEqualTo() bool {
// <=
return feo.OpChars0 != nil && feo.OpChars0.LessThan != nil && feo.OpChars1 != nil && feo.OpChars1.Equal != nil
}
func (feo *FECompareOp) String() string {
if feo.IsEqual() {
return OperatorEquals
} else if feo.IsNotEqual() {
return OperatorNotEquals
} else if feo.IsGreaterThan() {
return OperatorGreaterThan
} else if feo.IsGreaterThanOrEqualTo() {
return OperatorGreaterThanEq
} else if feo.IsLessThan() {
return OperatorLessThan
} else if feo.IsLessThanOrEqualTo() {
return OperatorLessThanEq
}
var invalidOp []string
if feo.OpChars0 != nil {
invalidOp = append(invalidOp, feo.OpChars0.String())
}
if feo.OpChars1 != nil {
invalidOp = append(invalidOp, feo.OpChars1.String())
}
if len(invalidOp) > 0 {
return strings.Join(invalidOp, "")
} else {
return "?? (FECompareOp)"
}
}
func (f *FECompareOp) OutputExpression(lhs Expression, rhs Expression) (Expression, error) {
if f.IsEqual() {
return EqualsExpr{
Lhs: lhs,
Rhs: rhs,
}, nil
} else if f.IsNotEqual() {
return NotEqualsExpr{
Lhs: lhs,
Rhs: rhs,
}, nil
} else if f.IsGreaterThan() {
return GreaterThanExpr{
Lhs: lhs,
Rhs: rhs,
}, nil
} else if f.IsGreaterThanOrEqualTo() {
return GreaterEqualsExpr{
Lhs: lhs,
Rhs: rhs,
}, nil
} else if f.IsLessThan() {
return LessThanExpr{
Lhs: lhs,
Rhs: rhs,
}, nil
} else if f.IsLessThanOrEqualTo() {
return LessEqualsExpr{
Lhs: lhs,
Rhs: rhs,
}, nil
}
return nil, fmt.Errorf("Invalid FECompareOp %v", f.String())
}
type FECheckOp struct {
Not *bool `( "IS" [ @"NOT" ]`
Null *bool `( @"NULL" |`
Missing *bool `@"MISSING" ) )`
}
func (feco *FECheckOp) isNot() bool {
return feco.Not != nil && *feco.Not == true
}
func (feco *FECheckOp) IsMissing() bool {
return !feco.isNot() && feco.isMissingInternal()
}
func (feco *FECheckOp) isMissingInternal() bool {
return feco.Missing != nil && *feco.Missing == true
}
func (feco *FECheckOp) IsNotMissing() bool {
return feco.isNot() && feco.isMissingInternal()
}
func (feco *FECheckOp) IsNull() bool {
return !feco.isNot() && feco.isNullInternal()
}
func (feco *FECheckOp) isNullInternal() bool {
return feco.Null != nil && *feco.Null == true
}
func (feco *FECheckOp) IsNotNull() bool {
return feco.isNot() && feco.isNullInternal()
}
func (feco *FECheckOp) String() string {
if feco.IsMissing() {
return OperatorMissing
} else if feco.IsNotMissing() {
return OperatorNotMissing
} else if feco.IsNull() {