github.com/onsi/gomega@v1.32.0/matchers/have_prefix_matcher.go (about)

     1  package matchers
     2  
     3  import (
     4  	"fmt"
     5  
     6  	"github.com/onsi/gomega/format"
     7  )
     8  
     9  type HavePrefixMatcher struct {
    10  	Prefix string
    11  	Args   []interface{}
    12  }
    13  
    14  func (matcher *HavePrefixMatcher) Match(actual interface{}) (success bool, err error) {
    15  	actualString, ok := toString(actual)
    16  	if !ok {
    17  		return false, fmt.Errorf("HavePrefix matcher requires a string or stringer.  Got:\n%s", format.Object(actual, 1))
    18  	}
    19  	prefix := matcher.prefix()
    20  	return len(actualString) >= len(prefix) && actualString[0:len(prefix)] == prefix, nil
    21  }
    22  
    23  func (matcher *HavePrefixMatcher) prefix() string {
    24  	if len(matcher.Args) > 0 {
    25  		return fmt.Sprintf(matcher.Prefix, matcher.Args...)
    26  	}
    27  	return matcher.Prefix
    28  }
    29  
    30  func (matcher *HavePrefixMatcher) FailureMessage(actual interface{}) (message string) {
    31  	return format.Message(actual, "to have prefix", matcher.prefix())
    32  }
    33  
    34  func (matcher *HavePrefixMatcher) NegatedFailureMessage(actual interface{}) (message string) {
    35  	return format.Message(actual, "not to have prefix", matcher.prefix())
    36  }