go.chromium.org/luci@v0.0.0-20240309015107-7cdc2e660f33/luciexe/build/name_tracker.go (about)

     1  // Copyright 2020 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 build
    16  
    17  import (
    18  	"fmt"
    19  )
    20  
    21  type nameTracker struct {
    22  	pool map[string]int
    23  }
    24  
    25  func (n *nameTracker) resolveName(requested string) string {
    26  	if n.pool == nil {
    27  		n.pool = map[string]int{}
    28  	}
    29  
    30  	// First, do a lookup directly on `requested`. If it's unique, increment it
    31  	// and declare victory.
    32  	dupCount := n.pool[requested]
    33  	if dupCount == 0 {
    34  		n.pool[requested]++
    35  		return requested
    36  	}
    37  
    38  	// Now, increment dupCount until we get an empty slot.
    39  	for {
    40  		candidate := fmt.Sprintf("%s (%d)", requested, dupCount+1)
    41  		if n.pool[candidate] == 0 {
    42  			n.pool[candidate]++
    43  			n.pool[requested] = dupCount + 1
    44  			return candidate
    45  		}
    46  		dupCount++
    47  	}
    48  }