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be_in_display_order.go
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be_in_display_order.go
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package matchers
import (
"fmt"
"strings"
"github.com/cloudfoundry/cli/cf/terminal"
"github.com/onsi/gomega"
)
type OrderMatcher struct {
expected [][]string
failedText string
}
func BeInDisplayOrder(substrings ...[]string) gomega.OmegaMatcher {
return &OrderMatcher{
expected: substrings,
}
}
func (matcher *OrderMatcher) Match(actualStr interface{}) (success bool, err error) {
actual, ok := actualStr.([]string)
if !ok {
return false, nil
}
//loop and match, stop at last actual[0] line
for len(actual) > 1 {
if matched, msg := matchSingleLine(actual[0], matcher.expected[0]); matched {
if len(matcher.expected) == 1 {
return true, nil //no more expected to match, all passed
}
matcher.expected = matcher.expected[1:]
} else if msg != "" {
matcher.failedText = msg
return false, nil
}
actual = actual[1:]
}
//match the last actual line with the rest of expected
matched, msg := matchSingleLine(actual[0], matcher.expected[0])
if matched && len(matcher.expected) == 1 {
return true, nil
} else if msg != "" {
matcher.failedText = msg
return false, nil
} else if matched {
matcher.failedText = matcher.expected[1][0]
return false, nil
}
matcher.failedText = matcher.expected[0][0]
return false, nil
}
func matchSingleLine(actual string, expected []string) (bool, string) {
matched := false
for i, target := range expected {
if index := strings.Index(terminal.Decolorize(actual), target); index != -1 {
if i == len(expected)-1 {
return true, ""
}
matched = true
actual = actual[index+len(target):]
} else if matched {
return false, target
} else {
return false, ""
}
}
return false, ""
}
func (matcher *OrderMatcher) FailureMessage(actual interface{}) string {
actualStrings, ok := actual.([]string)
if !ok {
return fmt.Sprintf("Expected actual to be a slice of strings, but it's actually a %T", actual)
}
return fmt.Sprintf("expected to find \"%s\" in display order in actual:\n'%s'\n", matcher.failedText, strings.Join(actualStrings, "\n"))
}
func (matcher *OrderMatcher) NegatedFailureMessage(actual interface{}) string {
actualStrings, ok := actual.([]string)
if !ok {
return fmt.Sprintf("Expected actual to be a slice of strings, but it's actually a %T", actual)
}
return fmt.Sprintf("expected to not find strings in display order in actual:\n'%s'\n", strings.Join(actualStrings, "\n"))
}