accounts/abi: support constructor/fallback/receive

accounts/abi/human_readable_test.go

@@ -68,9 +68,14 @@ func parseHumanReadableABIArray(signatures []string) ([]byte, error) {
 		}
 		isEvent := resultType == "event"
 		isFunction := resultType == "function"
+		isConstructor := resultType == "constructor"
+		isFallback := resultType == "fallback"
+		isReceive := resultType == "receive"
 
-		if name, ok := result["name"]; ok {
-			normalized["name"] = name
+		if !isConstructor && !isFallback && !isReceive {
+			if name, ok := result["name"]; ok {
+				normalized["name"] = name
+			}
 		}
 		if inputs, ok := result["inputs"].([]ArgumentMarshaling); ok {
 			normInputs := make([]map[string]interface{}, len(inputs))
@@ -169,6 +174,53 @@ func TestParseHumanReadableABI(t *testing.T) {
 				}
 			]`,
 		},
+		{
+			name:  "constructor",
+			input: []string{"constructor(address owner, uint256 initialSupply)"},
+			expected: `[
+				{
+					"type": "constructor",
+					"inputs": [
+						{"name": "owner", "type": "address"},
+						{"name": "initialSupply", "type": "uint256"}
+					],
+					"stateMutability": "nonpayable"
+				}
+			]`,
+		},
+		{
+			name:  "constructor payable",
+			input: []string{"constructor(address owner) payable"},
+			expected: `[
+				{
+					"type": "constructor",
+					"inputs": [
+						{"name": "owner", "type": "address"}
+					],
+					"stateMutability": "payable"
+				}
+			]`,
+		},
+		{
+			name:  "fallback function",
+			input: []string{"fallback()"},
+			expected: `[
+				{
+					"type": "fallback",
+					"stateMutability": "nonpayable"
+				}
+			]`,
+		},
+		{
+			name:  "receive function",
+			input: []string{"receive() payable"},
+			expected: `[
+				{
+					"type": "receive",
+					"stateMutability": "payable"
+				}
+			]`,
+		},
 		{
 			name: "multiple functions",
 			input: []string{
@@ -384,6 +436,48 @@ func TestParseHumanReadableABI(t *testing.T) {
 				}
 			]`,
 		},
+		{
+			name: "int and uint without explicit sizes normalize to 256 bits",
+			input: []string{
+				"function testIntUint(int value1, uint value2)",
+				"function testArrays(int[] values1, uint[10] values2)",
+				"function testMixed(int value1, uint value2, int8 value3, uint256 value4)",
+			},
+			expected: `[
+				{
+					"type": "function",
+					"name": "testIntUint",
+					"inputs": [
+						{"name": "value1", "type": "int256"},
+						{"name": "value2", "type": "uint256"}
+					],
+					"outputs": [],
+					"stateMutability": "nonpayable"
+				},
+				{
+					"type": "function",
+					"name": "testArrays",
+					"inputs": [
+						{"name": "values1", "type": "int256[]"},
+						{"name": "values2", "type": "uint256[10]"}
+					],
+					"outputs": [],
+					"stateMutability": "nonpayable"
+				},
+				{
+					"type": "function",
+					"name": "testMixed",
+					"inputs": [
+						{"name": "value1", "type": "int256"},
+						{"name": "value2", "type": "uint256"},
+						{"name": "value3", "type": "int8"},
+						{"name": "value4", "type": "uint256"}
+					],
+					"outputs": [],
+					"stateMutability": "nonpayable"
+				}
+			]`,
+		},
 	}
 
 	for _, tt := range tests {

accounts/abi/selector_parser.go

@@ -51,6 +51,18 @@ type ABIMarshaling map[string]interface{}
 func ParseHumanReadableABI(signature string) (ABIMarshaling, error) {
 	signature = skipWhitespace(signature)
 
+	if strings.HasPrefix(signature, "constructor") {
+		return ParseConstructor(signature)
+	}
+
+	if strings.HasPrefix(signature, "fallback") {
+		return ParseFallback(signature)
+	}
+
+	if strings.HasPrefix(signature, "receive") {
+		return ParseReceive(signature)
+	}
+
 	if strings.HasPrefix(signature, "event ") || (strings.Contains(signature, "(") && strings.Contains(signature, "indexed")) {
 		event, err := ParseEvent(signature)
 		if err != nil {
@@ -151,6 +163,23 @@ func parseKeyword(s string, keyword string) (string, bool) {
 	return skipWhitespace(rest), true
 }
 
+// normalizeType normalizes bare int/uint to int256/uint256, including arrays
+func normalizeType(typeName string) string {
+	if typeName == "int" {
+		return "int256"
+	}
+	if typeName == "uint" {
+		return "uint256"
+	}
+	if strings.HasPrefix(typeName, "int[") {
+		return "int256" + typeName[3:]
+	}
+	if strings.HasPrefix(typeName, "uint[") {
+		return "uint256" + typeName[4:]
+	}
+	return typeName
+}
+
 func parseElementaryType(unescapedSelector string) (string, string, error) {
 	parsedType, rest, err := parseToken(unescapedSelector, false)
 	if err != nil {
@@ -169,6 +198,7 @@ func parseElementaryType(unescapedSelector string) (string, string, error) {
 		parsedType = parsedType + string(rest[0])
 		rest = rest[1:]
 	}
+	parsedType = normalizeType(parsedType)
 	return parsedType, rest, nil
 }
 
@@ -431,6 +461,115 @@ func ParseError(unescapedSelector string) (ErrorMarshaling, error) {
 	}, nil
 }
 
+// ParseConstructor parses a constructor signature
+func ParseConstructor(signature string) (ABIMarshaling, error) {
+	signature = skipWhitespace(signature)
+
+	rest, _ := parseKeyword(signature, "constructor")
+	rest = skipWhitespace(rest)
+
+	if len(rest) == 0 || rest[0] != '(' {
+		return nil, fmt.Errorf("expected '(' after constructor keyword")
+	}
+	rest = rest[1:]
+
+	parenCount := 1
+	paramEnd := 0
+	for i := 0; i < len(rest); i++ {
+		if rest[i] == '(' {
+			parenCount++
+		} else if rest[i] == ')' {
+			parenCount--
+			if parenCount == 0 {
+				paramEnd = i
+				break
+			}
+		}
+	}
+
+	if parenCount != 0 {
+		return nil, fmt.Errorf("unbalanced parentheses in constructor signature")
+	}
+
+	paramsStr := rest[:paramEnd]
+	arguments, err := parseParameterList(paramsStr, false)
+	if err != nil {
+		return nil, fmt.Errorf("failed to parse constructor parameters: %v", err)
+	}
+
+	rest = skipWhitespace(rest[paramEnd+1:])
+
+	stateMutability := "nonpayable"
+	if newRest, found := parseKeyword(rest, "payable"); found {
+		stateMutability = "payable"
+		rest = newRest
+	}
+
+	result := make(ABIMarshaling)
+	result["type"] = "constructor"
+	result["inputs"] = arguments
+	result["stateMutability"] = stateMutability
+	return result, nil
+}
+
+// ParseFallback parses a fallback function signature
+// ParseFallback parses a fallback function signature (no parameters allowed)
+func ParseFallback(signature string) (ABIMarshaling, error) {
+	signature = skipWhitespace(signature)
+
+	rest, _ := parseKeyword(signature, "fallback")
+	rest = skipWhitespace(rest)
+
+	if len(rest) == 0 || rest[0] != '(' {
+		return nil, fmt.Errorf("expected '(' after fallback keyword")
+	}
+	rest = rest[1:]
+
+	if len(rest) == 0 || rest[0] != ')' {
+		return nil, fmt.Errorf("fallback function cannot have parameters")
+	}
+	rest = skipWhitespace(rest[1:])
+
+	stateMutability := "nonpayable"
+	if newRest, found := parseKeyword(rest, "payable"); found {
+		stateMutability = "payable"
+		rest = newRest
+	}
+
+	result := make(ABIMarshaling)
+	result["type"] = "fallback"
+	result["stateMutability"] = stateMutability
+	return result, nil
+}
+
+// ParseReceive parses a receive function signature (no parameters, always payable)
+func ParseReceive(signature string) (ABIMarshaling, error) {
+	signature = skipWhitespace(signature)
+
+	rest, _ := parseKeyword(signature, "receive")
+	rest = skipWhitespace(rest)
+
+	if len(rest) == 0 || rest[0] != '(' {
+		return nil, fmt.Errorf("expected '(' after receive keyword")
+	}
+	rest = rest[1:]
+
+	if len(rest) == 0 || rest[0] != ')' {
+		return nil, fmt.Errorf("receive function cannot have parameters")
+	}
+	rest = skipWhitespace(rest[1:])
+
+	stateMutability := "payable"
+	if newRest, found := parseKeyword(rest, "payable"); found {
+		rest = newRest
+	}
+
+	result := make(ABIMarshaling)
+	result["type"] = "receive"
+	result["stateMutability"] = stateMutability
+	return result, nil
+}
+
 func ParseSelector(unescapedSelector string) (SelectorMarshaling, error) {
 	unescapedSelector = skipWhitespace(unescapedSelector)