findParamLen() — fiber Function Reference

Architecture documentation for the findParamLen() function in path.go from the fiber codebase.

Function go FiberCore Routing calls 2

Entity Profile

FiberCore→ Routing→ findParamLen() — fiber Function Reference

Dependency Diagram

graph TD
  2fd95810_2ada_ab11_b5e5_4579a806f839["findParamLen()"]
  bedec411_93e0_4024_219e_79649f60a9be["path.go"]
  2fd95810_2ada_ab11_b5e5_4579a806f839 -->|defined in| bedec411_93e0_4024_219e_79649f60a9be
  e448da38_7f9c_e7f4_07b9_47fdbbc2b234["findParamLenForLastSegment()"]
  2fd95810_2ada_ab11_b5e5_4579a806f839 -->|calls| e448da38_7f9c_e7f4_07b9_47fdbbc2b234
  005070ba_d3d6_212f_36df_f3fc9f497c80["findGreedyParamLen()"]
  2fd95810_2ada_ab11_b5e5_4579a806f839 -->|calls| 005070ba_d3d6_212f_36df_f3fc9f497c80
  style 2fd95810_2ada_ab11_b5e5_4579a806f839 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

path.go lines 561–591

func findParamLen(s string, segment *routeSegment) int {
	if segment.IsLast {
		return findParamLenForLastSegment(s, segment)
	}

	if segment.Length != 0 && len(s) >= segment.Length {
		return segment.Length
	} else if segment.IsGreedy {
		// Search the parameters until the next constant part
		// special logic for greedy params
		searchCount := strings.Count(s, segment.ComparePart)
		if searchCount > 1 {
			return findGreedyParamLen(s, searchCount, segment)
		}
	}

	if len(segment.ComparePart) == 1 {
		if constPosition := strings.IndexByte(s, segment.ComparePart[0]); constPosition != -1 {
			return constPosition
		}
	} else if constPosition := strings.Index(s, segment.ComparePart); constPosition != -1 {
		// if the compare part was found, but contains a slash although this part is not greedy, then it must not match
		// example: /api/:param/fixedEnd -> path: /api/123/456/fixedEnd = no match , /api/123/fixedEnd = match
		if !segment.IsGreedy && strings.IndexByte(s[:constPosition], slashDelimiter) != -1 {
			return 0
		}
		return constPosition
	}

	return len(s)
}