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feat(stylus): implement event signature parser
Codex did this.
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‎internal/stylus/event_signature.go‎

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package stylus
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import (
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"fmt"
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"strings"
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"unicode"
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)
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type eventSignature struct {
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Name string
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Params []eventParameter
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}
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type eventParameter struct {
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Type string
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Name string
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Indexed bool
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}
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func parseEventSignature(signature string) (eventSignature, error) {
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signature = strings.TrimSpace(signature)
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if signature == "" {
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return eventSignature{}, fmt.Errorf("empty signature")
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}
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if strings.HasPrefix(signature, "event") {
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afterKeyword := signature[len("event"):]
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if afterKeyword == "" {
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return eventSignature{}, fmt.Errorf("event signature missing identifier and parameters")
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}
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trimmed := strings.TrimLeftFunc(afterKeyword, unicode.IsSpace)
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if len(trimmed) != len(afterKeyword) {
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signature = strings.TrimSpace(trimmed)
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}
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}
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if strings.HasSuffix(signature, ";") {
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signature = strings.TrimSpace(signature[:len(signature)-1])
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}
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if signature == "" {
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return eventSignature{}, fmt.Errorf("event signature missing identifier and parameters")
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}
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open := strings.Index(signature, "(")
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close := strings.LastIndex(signature, ")")
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if open == -1 || close == -1 || close < open {
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return eventSignature{}, fmt.Errorf("invalid event signature format: %s", signature)
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}
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name := strings.TrimSpace(signature[:open])
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if name == "" {
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return eventSignature{}, fmt.Errorf("event name missing in signature: %s", signature)
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}
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paramsRaw := signature[open+1 : close]
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paramStrings, err := splitEventParameters(paramsRaw)
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if err != nil {
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return eventSignature{}, err
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}
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params := make([]eventParameter, 0, len(paramStrings))
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for idx, paramString := range paramStrings {
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paramString = strings.TrimSpace(paramString)
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if paramString == "" {
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continue
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}
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param, err := parseEventParameter(paramString)
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if err != nil {
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return eventSignature{}, fmt.Errorf("parse param %d: %w", idx, err)
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}
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params = append(params, param)
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}
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return eventSignature{Name: name, Params: params}, nil
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}
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func splitEventParameters(params string) ([]string, error) {
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if strings.TrimSpace(params) == "" {
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return nil, nil
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}
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result := []string{}
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depth := 0
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last := 0
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for i, r := range params {
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switch r {
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case '(':
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depth++
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case ')':
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if depth == 0 {
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return nil, fmt.Errorf("unbalanced parentheses in parameter list: %s", params)
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}
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depth--
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case ',':
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if depth == 0 {
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segment := strings.TrimSpace(params[last:i])
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result = append(result, segment)
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last = i + 1
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}
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}
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}
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if depth != 0 {
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return nil, fmt.Errorf("unbalanced parentheses in parameter list: %s", params)
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}
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finalSegment := strings.TrimSpace(params[last:])
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if finalSegment != "" {
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result = append(result, finalSegment)
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}
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return result, nil
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}
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func parseEventParameter(param string) (eventParameter, error) {
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fields := strings.Fields(param)
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if len(fields) == 0 {
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return eventParameter{}, fmt.Errorf("empty parameter")
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}
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result := eventParameter{Type: fields[0]}
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idx := 1
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if idx < len(fields) && fields[idx] == "payable" {
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result.Type += " payable"
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idx++
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}
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for idx < len(fields) && fields[idx] == "indexed" {
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result.Indexed = true
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idx++
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}
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if idx < len(fields) {
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result.Name = fields[idx]
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idx++
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}
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if idx < len(fields) {
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return eventParameter{}, fmt.Errorf("unexpected tokens in parameter: %s", param)
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}
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return result, nil
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}

‎internal/stylus/event_signature_test.go‎

Lines changed: 230 additions & 0 deletions
Original file line numberDiff line numberDiff line change
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package stylus
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import (
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"reflect"
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"strings"
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"testing"
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)
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func TestParseEventSignatureBasicIndexed(t *testing.T) {
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got, err := parseEventSignature("event Transfer(address indexed from, address indexed to, uint256 value);")
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if err != nil {
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t.Fatalf("unexpected error: %v", err)
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}
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want := eventSignature{
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Name: "Transfer",
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Params: []eventParameter{
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{Type: "address", Name: "from", Indexed: true},
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{Type: "address", Name: "to", Indexed: true},
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{Type: "uint256", Name: "value"},
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},
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}
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assertEventSignatureEqual(t, got, want)
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}
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func TestParseEventSignatureTupleParam(t *testing.T) {
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got, err := parseEventSignature("event Complex(tuple(uint256,string) indexed meta, uint8 flag);")
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if err != nil {
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t.Fatalf("unexpected error: %v", err)
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}
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want := eventSignature{
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Name: "Complex",
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Params: []eventParameter{
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{Type: "tuple(uint256,string)", Name: "meta", Indexed: true},
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{Type: "uint8", Name: "flag"},
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},
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}
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assertEventSignatureEqual(t, got, want)
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}
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func TestParseEventSignatureIndexedWithoutName(t *testing.T) {
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got, err := parseEventSignature("event Anonymous(uint256 indexed);")
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if err != nil {
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t.Fatalf("unexpected error: %v", err)
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}
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want := eventSignature{
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Name: "Anonymous",
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Params: []eventParameter{
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{Type: "uint256", Indexed: true},
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},
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}
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assertEventSignatureEqual(t, got, want)
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}
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func TestParseEventSignatureNoParams(t *testing.T) {
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got, err := parseEventSignature("event Ping();")
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if err != nil {
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t.Fatalf("unexpected error: %v", err)
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}
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want := eventSignature{
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Name: "Ping",
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Params: []eventParameter{},
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}
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assertEventSignatureEqual(t, got, want)
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}
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func TestParseEventSignatureTrimsWhitespace(t *testing.T) {
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got, err := parseEventSignature(" event EventWithSpaces ( address a , uint256 b ) ; ")
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if err != nil {
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t.Fatalf("unexpected error: %v", err)
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}
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want := eventSignature{
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Name: "EventWithSpaces",
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Params: []eventParameter{
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{Type: "address", Name: "a"},
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{Type: "uint256", Name: "b"},
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},
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}
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assertEventSignatureEqual(t, got, want)
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}
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func TestParseEventSignatureArrayTypes(t *testing.T) {
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got, err := parseEventSignature("event WithArrays(address[] indexed owners, uint256[3] balances, bytes32[][] data);")
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if err != nil {
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t.Fatalf("unexpected error: %v", err)
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}
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want := eventSignature{
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Name: "WithArrays",
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Params: []eventParameter{
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{Type: "address[]", Name: "owners", Indexed: true},
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{Type: "uint256[3]", Name: "balances"},
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{Type: "bytes32[][]", Name: "data"},
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},
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}
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assertEventSignatureEqual(t, got, want)
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}
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func TestParseEventSignaturePayableAddress(t *testing.T) {
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got, err := parseEventSignature("event WithPayable(address payable indexed recipient, address payable sender);")
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if err != nil {
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t.Fatalf("unexpected error: %v", err)
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}
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want := eventSignature{
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Name: "WithPayable",
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Params: []eventParameter{
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{Type: "address payable", Name: "recipient", Indexed: true},
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{Type: "address payable", Name: "sender"},
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},
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}
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assertEventSignatureEqual(t, got, want)
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}
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func TestParseEventSignatureMissingParentheses(t *testing.T) {
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assertEventSignatureError(t, "event BrokenEvent;", "invalid event signature")
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}
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func TestParseEventSignatureUnexpectedTokens(t *testing.T) {
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assertEventSignatureError(t, "event Bad(uint256 value extra);", "unexpected tokens")
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}
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func TestParseEventSignatureUnbalancedTuple(t *testing.T) {
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assertEventSignatureError(t, "event Bad(tuple(uint256,string) value;", "unbalanced parentheses")
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}
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func assertEventSignatureEqual(t *testing.T, got, want eventSignature) {
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if !reflect.DeepEqual(got, want) {
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t.Fatalf("parseEventSignature() = %#v, want %#v", got, want)
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}
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}
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func assertEventSignatureError(t *testing.T, signature, substr string) {
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_, err := parseEventSignature(signature)
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if err == nil {
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t.Fatalf("expected error containing %q, got nil", substr)
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}
149+
if !strings.Contains(err.Error(), substr) {
150+
t.Fatalf("expected error containing %q, got %v", substr, err)
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}
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}
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func TestParseEventSignatureNoPrefix(t *testing.T) {
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got, err := parseEventSignature("Transfer(address indexed from, address indexed to, uint256 value);")
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if err != nil {
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t.Fatalf("unexpected error: %v", err)
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}
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want := eventSignature{
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Name: "Transfer",
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Params: []eventParameter{
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{Type: "address", Name: "from", Indexed: true},
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{Type: "address", Name: "to", Indexed: true},
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{Type: "uint256", Name: "value"},
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},
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}
168+
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assertEventSignatureEqual(t, got, want)
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}
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func TestParseEventSignatureNoSemicolon(t *testing.T) {
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got, err := parseEventSignature("event Transfer(address indexed from, address indexed to, uint256 value)")
174+
if err != nil {
175+
t.Fatalf("unexpected error: %v", err)
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}
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want := eventSignature{
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Name: "Transfer",
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Params: []eventParameter{
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{Type: "address", Name: "from", Indexed: true},
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{Type: "address", Name: "to", Indexed: true},
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{Type: "uint256", Name: "value"},
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},
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}
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assertEventSignatureEqual(t, got, want)
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}
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func TestParseEventSignatureNoPrefixOrSemicolon(t *testing.T) {
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got, err := parseEventSignature("Transfer(address indexed from, address indexed to, uint256 value)")
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if err != nil {
193+
t.Fatalf("unexpected error: %v", err)
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}
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want := eventSignature{
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Name: "Transfer",
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Params: []eventParameter{
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{Type: "address", Name: "from", Indexed: true},
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{Type: "address", Name: "to", Indexed: true},
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{Type: "uint256", Name: "value"},
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},
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}
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assertEventSignatureEqual(t, got, want)
206+
}
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func TestParseEventSignatureBareEventKeyword(t *testing.T) {
209+
assertEventSignatureError(t, "event", "missing identifier and parameters")
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}
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func TestParseEventSignatureNestedTupleArray(t *testing.T) {
213+
sig := "\treplaceDeposit((bytes4,bytes2,bytes,bytes,bytes,bytes4)[],(bytes,uint256,uint256),uint256,bytes32)"
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got, err := parseEventSignature(sig)
215+
if err != nil {
216+
t.Fatalf("unexpected error: %v", err)
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}
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want := eventSignature{
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Name: "replaceDeposit",
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Params: []eventParameter{
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{Type: "(bytes4,bytes2,bytes,bytes,bytes,bytes4)[]"},
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{Type: "(bytes,uint256,uint256)"},
224+
{Type: "uint256"},
225+
{Type: "bytes32"},
226+
},
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}
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assertEventSignatureEqual(t, got, want)
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}

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