parse binary literal const (#1593)

* support binary const

Signed-off-by: sdghchj <sdghchj@qq.com>

* add test

Signed-off-by: sdghchj <sdghchj@qq.com>

---------

Signed-off-by: sdghchj <sdghchj@qq.com>

Author: sdghchj

enums_test.go

@@ -28,5 +28,6 @@ func TestParseGlobalEnums(t *testing.T) {
 	assert.Equal(t, 15, p.packages.packages[constsPath].ConstTable["octnum"].Value)
 	assert.Equal(t, `aa\nbb\u8888cc`, p.packages.packages[constsPath].ConstTable["nonescapestr"].Value)
 	assert.Equal(t, "aa\nbb\u8888cc", p.packages.packages[constsPath].ConstTable["escapestr"].Value)
-	assert.Equal(t, '\u8888', p.packages.packages[constsPath].ConstTable["escapechar"].Value)
+	assert.Equal(t, 1_000_000, p.packages.packages[constsPath].ConstTable["underscored"].Value)
+	assert.Equal(t, 0b10001000, p.packages.packages[constsPath].ConstTable["binaryInteger"].Value)
 }

package.go

@@ -99,22 +99,22 @@ func (pkg *PackageDefinitions) evaluateConstValue(file *ast.File, iota int, expr
 			if strings.ContainsRune(valueExpr.Value, '_') {
 				valueExpr.Value = strings.Replace(valueExpr.Value, "_", "", -1)
 			}
-			// hexadecimal
-			if len(valueExpr.Value) > 2 && valueExpr.Value[0] == '0' && valueExpr.Value[1] == 'x' {
-				if x, err := strconv.ParseInt(valueExpr.Value[2:], 16, 64); err == nil {
-					return int(x), nil
-				} else if x, err := strconv.ParseUint(valueExpr.Value[2:], 16, 64); err == nil {
-					return x, nil
-				} else {
-					panic(err)
+			if len(valueExpr.Value) >= 2 && valueExpr.Value[0] == '0' {
+				var start, base = 2, 8
+				switch valueExpr.Value[1] {
+				case 'x', 'X':
+					//hex
+					base = 16
+				case 'b', 'B':
+					//binary
+					base = 2
+				default:
+					//octet
+					start = 1
 				}
-			}
-
-			//octet
-			if len(valueExpr.Value) > 1 && valueExpr.Value[0] == '0' {
-				if x, err := strconv.ParseInt(valueExpr.Value[1:], 8, 64); err == nil {
+				if x, err := strconv.ParseInt(valueExpr.Value[start:], base, 64); err == nil {
 					return int(x), nil
-				} else if x, err := strconv.ParseUint(valueExpr.Value[1:], 8, 64); err == nil {
+				} else if x, err := strconv.ParseUint(valueExpr.Value[start:], base, 64); err == nil {
 					return x, nil
 				} else {
 					panic(err)

testdata/enums/consts/const.go

@@ -11,3 +11,4 @@ const nonescapestr = `aa\nbb\u8888cc`
 const escapestr = "aa\nbb\u8888cc"
 const escapechar = '\u8888'
 const underscored = 1_000_000
+const binaryInteger = 0b10001000