Method analyseParameterPart

path.go:362–465

analyseParameterPart find the parameter end and create the route segment

(pattern string, regexHandler any, customConstraints ...CustomConstraint)

// analyseParameterPart find the parameter end and create the route segment
func (parser *routeParser) analyseParameterPart(pattern string, regexHandler any, customConstraints ...CustomConstraint) (int, *routeSegment) {
	isWildCard := pattern[0] == wildcardParam
	isPlusParam := pattern[0] == plusParam

	paramEndPosition := 0
	paramConstraintStartPosition := -1
	paramConstraintEndPosition := -1

	// handle wildcard end
	if !isWildCard && !isPlusParam {
		paramEndPosition = -1
		search := pattern[1:]
		for i := range search {
			if paramConstraintStartPosition == -1 && search[i] == paramConstraintStart && (i == 0 || search[i-1] != escapeChar) {
				paramConstraintStartPosition = i + 1
				continue
			}
			if paramConstraintStartPosition != -1 && search[i] == paramConstraintEnd && (i == 0 || search[i-1] != escapeChar) {
				paramConstraintEndPosition = i + 1
				continue
			}
			if parameterEndChars[search[i]] {
				if (paramConstraintStartPosition == -1 && paramConstraintEndPosition == -1) ||
					(paramConstraintStartPosition != -1 && paramConstraintEndPosition != -1) {
					paramEndPosition = i
					break
				}
			}
		}

		switch {
		case paramEndPosition == -1:
			paramEndPosition = len(pattern) - 1
		case bytes.IndexByte(parameterDelimiterChars, pattern[paramEndPosition+1]) == -1:
			paramEndPosition++
		default:
			// do nothing
		}
	}

	// cut params part
	processedPart := pattern[0 : paramEndPosition+1]
	n := paramEndPosition + 1
	paramName := RemoveEscapeChar(GetTrimmedParam(processedPart))

	// Check has constraint
	var constraints []*Constraint

	if hasConstraint := paramConstraintStartPosition != -1 && paramConstraintEndPosition != -1; hasConstraint {
		constraintString := pattern[paramConstraintStartPosition+1 : paramConstraintEndPosition]
		userConstraints := splitNonEscaped(constraintString, paramConstraintSeparator)
		constraints = make([]*Constraint, 0, len(userConstraints))

		for _, c := range userConstraints {
			start := findNextNonEscapedCharPosition(c, paramConstraintDataStart)
			end := strings.LastIndexByte(c, paramConstraintDataEnd)

			var rawName string