/// <summary>
/// Generates a slice literal of the specified type name and optional values.
/// </summary>
/// <param name="typeName">The fully qualified slice type name.</param>
/// <param name="values">Optional slice values. Pass null to omit values.</param>
/// <returns>The root node in this slice literal AST.</returns>
public static Node Generate(string typeName, IEnumerable <Node> values)
{
if (string.IsNullOrWhiteSpace(typeName))
{
throw new ArgumentException(nameof(typeName));
}
if (values != null && !values.Any())
{
throw new ArgumentException("pass null for no slice elements");
}
var openBracket = new OpenDelimiter(BinaryDelimiterType.Bracket);
var closeBracket = openBracket.AddClosingDelimiter();
var id = new Identifier(typeName);
closeBracket.AddChild(id);
var openBrace = new OpenDelimiter(BinaryDelimiterType.Brace);
if (values != null)
{
var seq = DelimitedSequence.Generate(UnaryDelimiterType.Comma, values.ToList());
openBrace.AddChild(seq);
}
openBrace.AddClosingDelimiter();
id.AddChild(openBrace);
return(openBracket);
}
/// <summary>
/// Generates a function signature from the specified parameters.
/// </summary>
/// <param name="receiver">Optional signature for a receiver.</param>
/// <param name="name">The name of the function.</param>
/// <param name="parameters">Optional list of parameters. Pass null if there are no parameters.</param>
/// <param name="returns">Optional list of return values. Pass null if there are no return values.</param>
/// <returns>The root node in the function signature AST.</returns>
public static Node Generate(FuncParamSig receiver, string name, IReadOnlyList <FuncParamSig> parameters, IReadOnlyList <FuncReturnSig> returns)
{
if (string.IsNullOrWhiteSpace(name))
{
throw new ArgumentException(nameof(name));
}
var func = new Func();
if (receiver != null)
{
var recvOpenParen = new OpenDelimiter(BinaryDelimiterType.Paren);
recvOpenParen.AddChild(receiver);
recvOpenParen.AddClosingDelimiter();
func.AddChild(recvOpenParen);
}
func.AddChild(new Identifier(name));
// build parameters
var paramsStart = new OpenDelimiter(BinaryDelimiterType.Paren);
if (parameters != null)
{
paramsStart.AddChild(DelimitedSequence.Generate(UnaryDelimiterType.Comma, parameters));
}
paramsStart.AddClosingDelimiter();
func.AddChild(paramsStart);
if (returns != null)
{
// multiple return values or a single return value
// that has a name must be enclosed in parentheses
if (returns.Count == 1)
{
var ret = returns[0];
if (ret.IsNamed)
{
var returnOpenParen = new OpenDelimiter(BinaryDelimiterType.Paren);
returnOpenParen.AddChild(ret);
returnOpenParen.AddClosingDelimiter();
func.AddChild(returnOpenParen);
}
else
{
func.AddChild(ret);
}
}
else
{
var returnOpenParen = new OpenDelimiter(BinaryDelimiterType.Paren);
returnOpenParen.AddChild(DelimitedSequence.Generate(UnaryDelimiterType.Comma, returns));
returnOpenParen.AddClosingDelimiter();
func.AddChild(returnOpenParen);
}
}
return(func);
}
/// <summary>
/// Generates a standard error checking sequence.
/// E.g. if err != nil return var1, var2, varN
/// </summary>
/// <param name="errorVar">The name of the error variable.</param>
/// <param name="toReturn">
/// List of variables to return. All variables in
/// this list will be returned in the specified order.
/// </param>
/// <returns>The root node of this error checking AST.</returns>
public static Node Generate(string errorVar, IReadOnlyList <Node> toReturn)
{
var ret = new Return();
ret.AddChild(DelimitedSequence.Generate(UnaryDelimiterType.Comma, toReturn));
var node = IfBlock.Generate(BinaryOpSequence.Generate(BinaryOperatorType.NotEqualTo, new Identifier(errorVar), new Nil()), new[]
{
ret
});
return(node);
}
/// <summary>
/// Generates a function call for the specified values.
/// Example: package.Func(one, &two, three)
/// </summary>
/// <param name="name">The fully qualified name of the function to call.</param>
/// <param name="parameters">The optional list of parameters. Pass null if there are no parameters.</param>
/// <returns>The root node for this function call AST.</returns>
public static Node Generate(string name, IReadOnlyList <FuncCallParam> parameters)
{
if (string.IsNullOrWhiteSpace(name))
{
throw new ArgumentException(nameof(name));
}
if (parameters != null && parameters.Count == 0)
{
throw new ArgumentException("pass null if there are no arguments");
}
var funcCall = new Identifier(name);
var paramsStart = new OpenDelimiter(BinaryDelimiterType.Paren);
funcCall.AddChild(paramsStart);
if (parameters != null)
{
var seq = new Node[parameters.Count];
// build a comma separated list of params
for (int i = 0; i < parameters.Count; ++i)
{
var param = parameters[i];
Node p = null;
if (param.Pass == TypeModifier.ByReference)
{
p = UnaryOpSequence.Generate(UnaryOperatorType.Ampersand, param.Param);
}
else if (param.Pass == TypeModifier.ByValue)
{
p = param.Param;
}
seq[i] = p;
}
paramsStart.AddChild(DelimitedSequence.Generate(UnaryDelimiterType.Comma, seq));
}
paramsStart.AddClosingDelimiter();
return(funcCall);
}
/// <summary>
/// Generates a return statement with optional list of variables.
/// </summary>
/// <param name="varNames">Optional list of variables to be returned. Pass null if there are no variables to return.</param>
/// <returns>Root node in this return statement AST.</returns>
public static Node Generate(IReadOnlyList <string> varNames)
{
if (varNames != null && varNames.Count == 0)
{
throw new ArgumentException("pass null for no arguments to return");
}
var ret = new Return();
if (varNames != null)
{
Node[] returnVars = new Node[varNames.Count];
for (int i = 0; i < returnVars.Length; ++i)
{
returnVars[i] = new Identifier(varNames[i]);
}
ret.AddChild(DelimitedSequence.Generate(UnaryDelimiterType.Comma, returnVars));
}
return(ret);
}
/// <summary>
/// Generates a struct literal of the specified type name and optional field values.
/// </summary>
/// <param name="structTypeName">The fully qualified struct type name.</param>
/// <param name="values">Optional field values. Pass null to omit field initialization.</param>
/// <returns>The root node in this struct literal AST.</returns>
public static Node Generate(string structTypeName, IEnumerable <StructField> values)
{
if (string.IsNullOrWhiteSpace(structTypeName))
{
throw new ArgumentException(nameof(structTypeName));
}
if (values != null && !values.Any())
{
throw new ArgumentException("pass null to omit struct field initializers");
}
var id = new Identifier(structTypeName);
var openBrace = new OpenDelimiter(BinaryDelimiterType.Brace);
if (values != null)
{
var initList = new List <Node>();
foreach (var val in values)
{
var root = DelimitedSequence.Generate(UnaryDelimiterType.Colon, new[]
{
new Identifier(val.FieldName),
val.Value
});
initList.Add(root);
}
var seqRoot = DelimitedSequence.Generate(UnaryDelimiterType.Comma, initList, true);
openBrace.AddChild(seqRoot);
}
openBrace.AddClosingDelimiter();
id.AddChild(openBrace);
return(id);
}
/// <summary>
/// Generates a test case function for the specified method.
/// </summary>
/// <param name="mg">The method for which a test case will be generated.</param>
/// <param name="rpcTypeName">The type name use for RPC dispatch.</param>
/// <returns>The root node in this test case function AST.</returns>
public static Tuple <Node, string> Generate(MethodGo mg, string rpcTypeName, string replyTypeName, string replyConvFuncName, string loggerVarName)
{
if (mg == null)
{
throw new ArgumentNullException(nameof(mg));
}
if (string.IsNullOrWhiteSpace(replyTypeName))
{
throw new ArgumentException(nameof(replyTypeName));
}
if (string.IsNullOrWhiteSpace(replyConvFuncName))
{
throw new ArgumentException(nameof(replyConvFuncName));
}
var errorVar = "err";
var jsonParamVar = "parameters";
var replyVar = "reply";
var operationId = mg.SerializedName.ToString();
if (!char.IsUpper(operationId[0]))
{
operationId = $"{char.ToUpperInvariant(operationId[0])}{operationId.Substring(1)}";
}
var rpcTypeVar = char.ToLowerInvariant(rpcTypeName[0]).ToString();
var func = FunctionSignature.Generate(new FuncParamSig(rpcTypeVar, TypeModifier.ByReference, rpcTypeName),
operationId, new[]
{
new FuncParamSig(jsonParamVar, TypeModifier.ByValue, "json.RawMessage"),
new FuncParamSig(replyVar, TypeModifier.ByReference, replyTypeName)
}, new[]
{
new FuncReturnSig(null, TypeModifier.ByValue, "error")
});
var funcBody = new OpenDelimiter(BinaryDelimiterType.Brace);
// generate a type used to unmarshal the parameters
string unmarshalVar = null;
var unmarshalType = GenerateTypeForParamsUnmarshal(mg);
funcBody.AddChild(unmarshalType.Item1);
funcBody.AddChild(new Terminal());
unmarshalVar = unmarshalType.Item2.ToLowerInvariant();
// do the unmarshaling and return on failure
funcBody.AddChild(VariableDecl.Generate(unmarshalVar, unmarshalType.Item2));
funcBody.AddChild(new Terminal());
funcBody.AddChild(BinaryOpSequence.Generate(BinaryOperatorType.DeclareAndAssign, new Identifier(errorVar),
FunctionCall.Generate("json.Unmarshal", new[]
{
new FuncCallParam(new Identifier(jsonParamVar), TypeModifier.ByValue),
new FuncCallParam(new Identifier(unmarshalVar), TypeModifier.ByReference)
})));
funcBody.AddChild(new Terminal());
funcBody.AddChild(ErrorCheck.Generate(errorVar, OnError.ReturnError));
funcBody.AddChild(new Terminal());
var authVar = "auth";
funcBody.AddChild(BinaryOpSequence.Generate(BinaryOperatorType.DeclareAndAssign,
DelimitedSequence.Generate(UnaryDelimiterType.Comma, new[]
{
new Identifier(authVar),
new Identifier(errorVar)
}),
FunctionCall.Generate($"{unmarshalVar}.{ReservedParamsFieldName}.Credentials.CreateBearerAuthorizer", null)));
funcBody.AddChild(new Terminal());
funcBody.AddChild(ErrorCheck.Generate(errorVar, OnError.ReturnError));
funcBody.AddChild(new Terminal());
// create the client and call the target function
var clientVar = "client";
// check if the client ctor has any parameters
List <FuncCallParam> clientParams = null;
if (!string.IsNullOrWhiteSpace(((MethodGroupGo)mg.MethodGroup).GlobalParameters))
{
clientParams = new List <FuncCallParam>();
var globalParams = ((MethodGroupGo)mg.MethodGroup).GlobalParameters.Split(new[] { ',' });
// each param is the var name followed by the type name, e.g. "subscriptionID string"
foreach (var globalParam in globalParams)
{
var paramName = globalParam.Substring(0, globalParam.IndexOf(' '));
clientParams.Add(new FuncCallParam(new Identifier($"{unmarshalVar}.{paramName.Capitalize()}"), TypeModifier.ByValue));
}
}
funcBody.AddChild(FunctionCall.Generate($"{loggerVarName}.Println", new[]
{
new FuncCallParam(new Literal <string>(operationId), TypeModifier.ByValue)
}));
funcBody.AddChild(new Terminal());
funcBody.AddChild(FunctionCall.Generate($"{loggerVarName}.Printf", new[]
{
new FuncCallParam(new Literal <string>("received %v\\n"), TypeModifier.ByValue),
new FuncCallParam(new Identifier(unmarshalVar), TypeModifier.ByValue)
}));
funcBody.AddChild(new Terminal());
// the client creation function name prefix is hard-coded in the Go generator
var clientCtorName = $"{mg.CodeModel.Namespace}.New";
if (!string.IsNullOrWhiteSpace(mg.MethodGroup.Name))
{
clientCtorName = $"{clientCtorName}{((MethodGroupGo)mg.MethodGroup).ClientName}";
}
funcBody.AddChild(BinaryOpSequence.Generate(
BinaryOperatorType.DeclareAndAssign,
new Identifier(clientVar),
FunctionCall.Generate(clientCtorName, clientParams)));
funcBody.AddChild(new Terminal());
funcBody.AddChild(BinaryOpSequence.Generate(BinaryOperatorType.Assignment,
new Identifier($"{clientVar}.Authorizer"), new Identifier(authVar)));
funcBody.AddChild(new Terminal());
var rChanVar = "rChan";
var eChanVar = "eChan";
var responseVar = "resp";
var rawResponseVar = "rawResp";
var isLro = mg.IsLongRunningOperation() && !mg.IsPageable;
funcBody.AddChild(BinaryOpSequence.Generate(BinaryOperatorType.DeclareAndAssign,
DelimitedSequence.Generate(UnaryDelimiterType.Comma, new[]
{
new Identifier(isLro ? rChanVar : responseVar),
new Identifier(isLro ? eChanVar : errorVar)
}),
FunctionCall.Generate($"{clientVar}.{mg.Name}", GenerateApiCallParams(mg, unmarshalVar))));
funcBody.AddChild(new Terminal());
if (isLro)
{
funcBody.AddChild(BinaryOpSequence.Generate(BinaryOperatorType.Assignment,
new Identifier(errorVar), new Identifier($"<-{eChanVar}")));
funcBody.AddChild(new Terminal());
}
funcBody.AddChild(ErrorCheck.Generate(errorVar, OnError.ReturnError));
funcBody.AddChild(new Terminal());
if (isLro)
{
funcBody.AddChild(BinaryOpSequence.Generate(BinaryOperatorType.DeclareAndAssign,
new Identifier(responseVar), new Identifier($"<-{rChanVar}")));
funcBody.AddChild(new Terminal());
}
funcBody.AddChild(BinaryOpSequence.Generate(BinaryOperatorType.DeclareAndAssign,
DelimitedSequence.Generate(UnaryDelimiterType.Comma, new[]
{
new Identifier(rawResponseVar),
new Identifier(errorVar)
}),
FunctionCall.Generate(replyConvFuncName, new[]
{
new FuncCallParam(new Identifier(mg.HasReturnValue() ? $"{responseVar}.Response" : $"{responseVar}"), TypeModifier.ByReference),
new FuncCallParam(mg.HasReturnValue() ? (Node) new Identifier(responseVar) : new Nil(), TypeModifier.ByValue)
})));
funcBody.AddChild(new Terminal());
funcBody.AddChild(FunctionCall.Generate($"{loggerVarName}.Printf", new[]
{
new FuncCallParam(new Literal <string>("response %v\\n"), TypeModifier.ByValue),
new FuncCallParam(new Identifier($"*{rawResponseVar}"), TypeModifier.ByValue)
}));
funcBody.AddChild(new Terminal());
funcBody.AddChild(BinaryOpSequence.Generate(BinaryOperatorType.Assignment,
new Identifier($"*{replyVar}"), new Identifier($"*{rawResponseVar}")));
funcBody.AddChild(new Terminal());
funcBody.AddChild(ReturnStatement.Generate(new[]
{
errorVar
}));
funcBody.AddClosingDelimiter();
func.AddChild(funcBody);
return(new Tuple <Node, string>(func, operationId));
}