go.chromium.org/luci@v0.0.0-20240309015107-7cdc2e660f33/common/data/text/pattern/constant.go (about)

     1  // Copyright 2015 The LUCI Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package pattern
    16  
    17  type constant bool
    18  
    19  func (c constant) Match(s string) bool {
    20  	return bool(c)
    21  }
    22  
    23  func (c constant) String() string {
    24  	if c {
    25  		return "*"
    26  	}
    27  	return ""
    28  }
    29  
    30  var (
    31  	// Any matches anything.
    32  	Any Pattern
    33  	// None matches nothing.
    34  	None Pattern
    35  )
    36  
    37  func init() {
    38  	Any = constant(true)
    39  	None = constant(false)
    40  }