138 lines
2.9 KiB
Go
138 lines
2.9 KiB
Go
package bexpr
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import (
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"fmt"
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"io"
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"strings"
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)
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// TODO - Probably should make most of what is in here un-exported
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//go:generate pigeon -o grammar.go -optimize-parser grammar.peg
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//go:generate goimports -w grammar.go
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type Expression interface {
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ExpressionDump(w io.Writer, indent string, level int)
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}
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type UnaryOperator int
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const (
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UnaryOpNot UnaryOperator = iota
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)
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func (op UnaryOperator) String() string {
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switch op {
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case UnaryOpNot:
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return "Not"
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default:
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return "UNKNOWN"
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}
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}
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type BinaryOperator int
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const (
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BinaryOpAnd BinaryOperator = iota
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BinaryOpOr
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)
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func (op BinaryOperator) String() string {
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switch op {
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case BinaryOpAnd:
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return "And"
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case BinaryOpOr:
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return "Or"
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default:
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return "UNKNOWN"
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}
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}
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type MatchOperator int
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const (
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MatchEqual MatchOperator = iota
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MatchNotEqual
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MatchIn
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MatchNotIn
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MatchIsEmpty
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MatchIsNotEmpty
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MatchMatches
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MatchNotMatches
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)
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func (op MatchOperator) String() string {
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switch op {
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case MatchEqual:
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return "Equal"
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case MatchNotEqual:
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return "Not Equal"
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case MatchIn:
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return "In"
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case MatchNotIn:
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return "Not In"
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case MatchIsEmpty:
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return "Is Empty"
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case MatchIsNotEmpty:
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return "Is Not Empty"
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case MatchMatches:
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return "Matches"
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case MatchNotMatches:
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return "Not Matches"
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default:
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return "UNKNOWN"
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}
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}
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type MatchValue struct {
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Raw string
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Converted interface{}
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}
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type UnaryExpression struct {
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Operator UnaryOperator
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Operand Expression
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}
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type BinaryExpression struct {
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Left Expression
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Operator BinaryOperator
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Right Expression
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}
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type Selector []string
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func (sel Selector) String() string {
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return strings.Join([]string(sel), ".")
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}
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type MatchExpression struct {
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Selector Selector
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Operator MatchOperator
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Value *MatchValue
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}
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func (expr *UnaryExpression) ExpressionDump(w io.Writer, indent string, level int) {
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localIndent := strings.Repeat(indent, level)
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fmt.Fprintf(w, "%s%s {\n", localIndent, expr.Operator.String())
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expr.Operand.ExpressionDump(w, indent, level+1)
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fmt.Fprintf(w, "%s}\n", localIndent)
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}
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func (expr *BinaryExpression) ExpressionDump(w io.Writer, indent string, level int) {
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localIndent := strings.Repeat(indent, level)
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fmt.Fprintf(w, "%s%s {\n", localIndent, expr.Operator.String())
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expr.Left.ExpressionDump(w, indent, level+1)
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expr.Right.ExpressionDump(w, indent, level+1)
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fmt.Fprintf(w, "%s}\n", localIndent)
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}
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func (expr *MatchExpression) ExpressionDump(w io.Writer, indent string, level int) {
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switch expr.Operator {
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case MatchEqual, MatchNotEqual, MatchIn, MatchNotIn:
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fmt.Fprintf(w, "%[1]s%[3]s {\n%[2]sSelector: %[4]v\n%[2]sValue: %[5]q\n%[1]s}\n", strings.Repeat(indent, level), strings.Repeat(indent, level+1), expr.Operator.String(), expr.Selector, expr.Value.Raw)
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default:
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fmt.Fprintf(w, "%[1]s%[3]s {\n%[2]sSelector: %[4]v\n%[1]s}\n", strings.Repeat(indent, level), strings.Repeat(indent, level+1), expr.Operator.String(), expr.Selector)
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}
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}
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