Skip to content
Permalink
Branch: master
Find file Copy path
Find file Copy path
Fetching contributors…
Cannot retrieve contributors at this time
47 lines (33 sloc) 1.16 KB
package govaluate
import (
"bytes"
)
/*
Holds a series of "transactions" which represent each token as it is output by an outputter (such as ToSQLQuery()).
Some outputs (such as SQL) require a function call or non-c-like syntax to represent an expression.
To accomplish this, this struct keeps track of each translated token as it is output, and can return and rollback those transactions.
*/
type expressionOutputStream struct {
transactions []string
}
func (this *expressionOutputStream) add(transaction string) {
this.transactions = append(this.transactions, transaction)
}
func (this *expressionOutputStream) rollback() string {
index := len(this.transactions) - 1
ret := this.transactions[index]
this.transactions = this.transactions[:index]
return ret
}
func (this *expressionOutputStream) createString(delimiter string) string {
var retBuffer bytes.Buffer
var transaction string
penultimate := len(this.transactions) - 1
for i := 0; i < penultimate; i++ {
transaction = this.transactions[i]
retBuffer.WriteString(transaction)
retBuffer.WriteString(delimiter)
}
retBuffer.WriteString(this.transactions[penultimate])
return retBuffer.String()
}
You can’t perform that action at this time.