Method getFunctionAtPosition

pkg/lsp/handler.go:1363–1410

getFunctionAtPosition finds the function name and parameter index at a position

(content string, pos Position)

// getFunctionAtPosition finds the function name and parameter index at a position
func (h *Handler) getFunctionAtPosition(content string, pos Position) (string, int) {
	lines := strings.Split(content, "\n")
	if pos.Line >= len(lines) {
		return "", 0
	}

	line := lines[pos.Line]
	if pos.Character > len(line) {
		return "", 0
	}

	// Look backwards for opening parenthesis to find function name
	parenCount := 0
	paramIndex := 0
	funcEnd := -1

	for i := pos.Character - 1; i >= 0; i-- {
		ch := line[i]
		if ch == ')' {
			parenCount++
		} else if ch == '(' {
			if parenCount == 0 {
				funcEnd = i
				break
			}
			parenCount--
		} else if ch == ',' && parenCount == 0 {
			paramIndex++
		}
	}

	if funcEnd < 0 {
		return "", 0
	}

	// Extract function name (word before the parenthesis)
	funcStart := funcEnd - 1
	for funcStart >= 0 && (isAlphanumeric(line[funcStart]) || line[funcStart] == '_') {
		funcStart--
	}
	funcStart++

	if funcStart >= funcEnd {
		return "", 0
	}

	return line[funcStart:funcEnd], paramIndex
}

// isAlphanumeric checks if a byte is alphanumeric
func isAlphanumeric(c byte) bool {