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postfix with traverse op

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This commit is contained in:
Mike Farah 2020-09-24 13:20:02 +10:00
parent 95bc1e1599
commit c2159d9861
3 changed files with 61 additions and 47 deletions
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40
pkg/yqlib/path_postfix.go
View File

@ -21,31 +21,28 @@ type OperationType uint32
const (
None OperationType = 1 << iota
Traverse
Or
And
Equals
EqualsSelf
)
type PathElement struct {
PathElementType PathElementType
OperationType OperationType
Value interface{}
ChildElements [][]*PathElement
Finished bool
}
// debugging purposes only
func (p *PathElement) toString() string {
var result string = `Type: `
var result string = ``
switch p.PathElementType {
case PathKey:
result = result + fmt.Sprintf("PathKey - %v", p.Value)
for _, next := range p.ChildElements[0] {
result = result + fmt.Sprintf(".%v", next.Value)
}
result = result + "\n"
result = result + fmt.Sprintf("PathKey - '%v'\n", p.Value)
case ArrayIndex:
result = result + fmt.Sprintf("ArrayIndex - %v\n", p.Value)
result = result + fmt.Sprintf("ArrayIndex - '%v'\n", p.Value)
case Operation:
result = result + "Operation - "
switch p.OperationType {
@ -55,7 +52,12 @@ func (p *PathElement) toString() string {
result = result + "AND\n"
case Equals:
result = result + "EQUALS\n"
case EqualsSelf:
result = result + "EQUALS SELF\n"
case Traverse:
result = result + "TRAVERSE\n"
}
}
return result
}
@ -76,11 +78,16 @@ func initMaps() {
precedenceMap[TokenIds["EQUALS_OPERATOR"]] = 30
operationTypeMapper[TokenIds["EQUALS_OPERATOR"]] = Equals
precedenceMap[TokenIds["EQUALS_SELF_OPERATOR"]] = 30
operationTypeMapper[TokenIds["EQUALS_SELF_OPERATOR"]] = EqualsSelf
precedenceMap[TokenIds["TRAVERSE_OPERATOR"]] = 40
operationTypeMapper[TokenIds["TRAVERSE_OPERATOR"]] = Traverse
}
func createOperationPathElement(opToken *lex.Token) PathElement {
var childElements = make([][]*PathElement, 2)
var pathElement = PathElement{PathElementType: Operation, OperationType: operationTypeMapper[opToken.Type], ChildElements: childElements}
var pathElement = PathElement{PathElementType: Operation, OperationType: operationTypeMapper[opToken.Type]}
return pathElement
}
@ -119,22 +126,15 @@ func (p *pathPostFixer) ConvertToPostfix(infixTokens []*lex.Token) ([]*PathEleme
for _, token := range tokens {
switch token.Type {
case TokenIds["PATH_KEY"]: // handle splats and array appends here too
var emptyArray = [][]*PathElement{make([]*PathElement, 0)}
var pathElement = PathElement{PathElementType: PathKey, Value: token.Value, ChildElements: emptyArray}
if len(result) > 0 && result[len(result)-1].PathElementType == PathKey && !result[len(result)-1].Finished {
var lastElement = result[len(result)-1]
lastElement.ChildElements[0] = append(lastElement.ChildElements[0], &pathElement)
} else {
var pathElement = PathElement{PathElementType: PathKey, Value: token.Value}
result = append(result, &pathElement)
}
case TokenIds["("]:
opStack = append(opStack, token)
finishPathKey(result)
case TokenIds["OR_OPERATOR"], TokenIds["AND_OPERATOR"], TokenIds["EQUALS_OPERATOR"]:
case TokenIds["OR_OPERATOR"], TokenIds["AND_OPERATOR"], TokenIds["EQUALS_OPERATOR"], TokenIds["EQUALS_SELF_OPERATOR"], TokenIds["TRAVERSE_OPERATOR"]:
var currentPrecedence = precedenceMap[token.Type]
// pop off higher precedent operators onto the result
for len(opStack) > 0 && precedenceMap[opStack[len(opStack)-1].Type] > currentPrecedence {
for len(opStack) > 0 && precedenceMap[opStack[len(opStack)-1].Type] >= currentPrecedence {
opStack, result = popOpToResult(opStack, result)
}
// add this operator to the opStack

64
pkg/yqlib/path_postfix_test.go
View File

@ -25,9 +25,9 @@ func testExpression(expression string) (string, error) {
return formatted, nil
}
func TestPostFixSimple(t *testing.T) {
func TestPostFixSimpleExample(t *testing.T) {
var infix = "a"
var expectedOutput = `Type: PathKey - a
var expectedOutput = `PathKey - 'a'
--------
`
@ -39,9 +39,17 @@ func TestPostFixSimple(t *testing.T) {
test.AssertResultComplex(t, expectedOutput, actual)
}
func TestPostFixSimplePath(t *testing.T) {
func TestPostFixSimplePathExample(t *testing.T) {
var infix = "apples.bananas*.cat"
var expectedOutput = `Type: PathKey - apples.bananas*.cat
var expectedOutput = `PathKey - 'apples'
--------
PathKey - 'bananas*'
--------
Operation - TRAVERSE
--------
PathKey - 'cat'
--------
Operation - TRAVERSE
--------
`
@ -53,13 +61,13 @@ func TestPostFixSimplePath(t *testing.T) {
test.AssertResultComplex(t, expectedOutput, actual)
}
func TestPostFixOr(t *testing.T) {
func TestPostFixOrExample(t *testing.T) {
var infix = "a OR b"
var expectedOutput = `Type: PathKey - a
var expectedOutput = `PathKey - 'a'
--------
Type: PathKey - b
PathKey - 'b'
--------
Type: Operation - OR
Operation - OR
--------
`
@ -71,21 +79,21 @@ Type: Operation - OR
test.AssertResultComplex(t, expectedOutput, actual)
}
func TestPostFixOrWithEquals(t *testing.T) {
func TestPostFixOrWithEqualsExample(t *testing.T) {
var infix = "a==thing OR b==thongs"
var expectedOutput = `Type: PathKey - a
var expectedOutput = `PathKey - 'a'
--------
Type: PathKey - thing
PathKey - 'thing'
--------
Type: Operation - EQUALS
Operation - EQUALS
--------
Type: PathKey - b
PathKey - 'b'
--------
Type: PathKey - thongs
PathKey - 'thongs'
--------
Type: Operation - EQUALS
Operation - EQUALS
--------
Type: Operation - OR
Operation - OR
--------
`
@ -97,21 +105,29 @@ Type: Operation - OR
test.AssertResultComplex(t, expectedOutput, actual)
}
func TestPostFixOrWithEqualsPath(t *testing.T) {
func TestPostFixOrWithEqualsPathExample(t *testing.T) {
var infix = "apples.monkeys==thing OR bogs.bobos==thongs"
var expectedOutput = `Type: PathKey - apples.monkeys
var expectedOutput = `PathKey - 'apples'
--------
Type: PathKey - thing
PathKey - 'monkeys'
--------
Type: Operation - EQUALS
Operation - TRAVERSE
--------
Type: PathKey - bogs.bobos
PathKey - 'thing'
--------
Type: PathKey - thongs
Operation - EQUALS
--------
Type: Operation - EQUALS
PathKey - 'bogs'
--------
Type: Operation - OR
PathKey - 'bobos'
--------
Operation - TRAVERSE
--------
PathKey - 'thongs'
--------
Operation - EQUALS
--------
Operation - OR
--------
`

2
pkg/yqlib/path_tokeniser.go
View File

@ -25,8 +25,6 @@ func initTokens() {
")",
}
Tokens = []string{
"BEGIN_SUB_EXPRESSION",
"END_SUB_EXPRESSION",
"OR_OPERATOR",
"AND_OPERATOR",
"EQUALS_OPERATOR",