internal CommandBaseAst CommandRule()
{
Token token;
bool flag;
bool flag2;
IScriptExtent extent;
bool flag3 = false;
bool flag4 = false;
RedirectionAst[] redirections = null;
List<CommandElementAst> elements = new List<CommandElementAst>();
TokenizerMode mode = this._tokenizer.Mode;
try
{
CommandArgumentContext commandNameAfterInvoationOperator;
this.SetTokenizerMode(TokenizerMode.Command);
Token first = this.NextToken();
token = first;
extent = first.Extent;
flag = false;
flag2 = false;
if (first.Kind == TokenKind.Dot)
{
flag = true;
first = this.NextToken();
commandNameAfterInvoationOperator = CommandArgumentContext.CommandNameAfterInvocationOperator;
}
else if (first.Kind == TokenKind.Ampersand)
{
flag2 = true;
first = this.NextToken();
commandNameAfterInvoationOperator = CommandArgumentContext.CommandNameAfterInvocationOperator;
}
else
{
commandNameAfterInvoationOperator = CommandArgumentContext.CommandName;
}
bool flag5 = true;
while (flag5)
{
switch (first.Kind)
{
case TokenKind.Parameter:
if (((commandNameAfterInvoationOperator & CommandArgumentContext.CommandName) != 0) || flag3)
{
extent = first.Extent;
first.TokenFlags |= TokenFlags.CommandName;
StringConstantExpressionAst item = new StringConstantExpressionAst(first.Extent, first.Text, StringConstantType.BareWord);
elements.Add(item);
}
else
{
ExpressionAst commandArgument;
IScriptExtent extent2;
ParameterToken token3 = (ParameterToken) first;
if (token3.UsedColon && (this.PeekToken().Kind != TokenKind.Comma))
{
commandArgument = this.GetCommandArgument(CommandArgumentContext.CommandArgument, this.NextToken());
if (commandArgument == null)
{
extent2 = token3.Extent;
this.ReportError(After(extent2), ParserStrings.ParameterRequiresArgument, new object[] { token3.Text });
}
else
{
extent2 = ExtentOf(first, commandArgument);
}
}
else
{
commandArgument = null;
extent2 = first.Extent;
}
extent = extent2;
CommandParameterAst ast3 = new CommandParameterAst(extent2, token3.ParameterName, commandArgument, first.Extent);
elements.Add(ast3);
}
goto Label_0404;
case TokenKind.NewLine:
case TokenKind.RParen:
case TokenKind.RCurly:
case TokenKind.Semi:
case TokenKind.AndAnd:
case TokenKind.OrOr:
case TokenKind.Pipe:
case TokenKind.EndOfInput:
{
this.UngetToken(first);
flag5 = false;
continue;
}
case TokenKind.Ampersand:
extent = first.Extent;
this.ReportError(first.Extent, ParserStrings.MissingArgument, new object[0]);
goto Label_0404;
case TokenKind.Comma:
extent = first.Extent;
this.ReportError(first.Extent, ParserStrings.MissingArgument, new object[0]);
this.SkipNewlines();
goto Label_0404;
case TokenKind.MinusMinus:
extent = first.Extent;
elements.Add(flag3 ? ((CommandElementAst) new StringConstantExpressionAst(first.Extent, first.Text, StringConstantType.BareWord)) : ((CommandElementAst) new CommandParameterAst(first.Extent, "-", null, first.Extent)));
flag3 = true;
goto Label_0404;
case TokenKind.Redirection:
case TokenKind.RedirectInStd:
if ((commandNameAfterInvoationOperator & CommandArgumentContext.CommandName) != 0)
{
break;
}
if (redirections == null)
{
redirections = new RedirectionAst[7];
}
this.RedirectionRule((RedirectionToken) first, redirections, ref extent);
goto Label_0404;
default:
{
if ((first.Kind == TokenKind.InlineScript) && (commandNameAfterInvoationOperator == CommandArgumentContext.CommandName))
{
flag5 = this.InlineScriptRule(first, elements);
extent = elements.Last<CommandElementAst>().Extent;
if (flag5)
{
goto Label_0404;
}
continue;
}
ExpressionAst ast4 = this.GetCommandArgument(commandNameAfterInvoationOperator, first);
StringToken token4 = first as StringToken;
if ((token4 != null) && string.Equals(token4.Value, "--%", StringComparison.OrdinalIgnoreCase))
{
elements.Add(ast4);
extent = ast4.Extent;
StringToken verbatimCommandArgumentToken = this.GetVerbatimCommandArgumentToken();
if (verbatimCommandArgumentToken != null)
{
flag4 = true;
flag5 = false;
ast4 = new StringConstantExpressionAst(verbatimCommandArgumentToken.Extent, verbatimCommandArgumentToken.Value, StringConstantType.BareWord);
elements.Add(ast4);
extent = ast4.Extent;
}
}
else
{
extent = ast4.Extent;
elements.Add(ast4);
}
goto Label_0404;
}
}
extent = first.Extent;
elements.Add(new StringConstantExpressionAst(first.Extent, first.Text, StringConstantType.BareWord));
Label_0404:
if (!flag4)
{
commandNameAfterInvoationOperator = CommandArgumentContext.CommandArgument;
first = this.NextToken();
}
}
}
finally
{
this.SetTokenizerMode(mode);
}
if (elements.Count == 0)
{
if (flag || flag2)
{
IScriptExtent extent3 = token.Extent;
this.ReportError(extent3, ParserStrings.MissingExpression, new object[] { token.Text });
return new CommandExpressionAst(extent3, new ErrorExpressionAst(extent3, null), null);
}
return null;
}
return new CommandAst(ExtentOf(token, extent), elements, (flag || flag2) ? token.Kind : TokenKind.Unknown, (redirections != null) ? redirections.Where<RedirectionAst>(r => r != null) : null);
}
private static CommandRedirection GetCommandRedirection(RedirectionAst redirectionAst, System.Management.Automation.ExecutionContext context)
{
FileRedirectionAst ast = redirectionAst as FileRedirectionAst;
if (ast != null)
{
object obj2 = Compiler.GetExpressionValue(ast.Location, context, (IList)null);
return new FileRedirection(ast.FromStream, ast.Append, obj2.ToString());
}
MergingRedirectionAst ast2 = (MergingRedirectionAst) redirectionAst;
return new MergingRedirection(ast2.FromStream, ast2.ToStream);
}
private RedirectionAst RedirectionRule(RedirectionToken redirectionToken, RedirectionAst[] redirections, ref IScriptExtent extent)
{
RedirectionAst fileRedirectionAst;
string allStream;
FileRedirectionToken fileRedirectionToken = redirectionToken as FileRedirectionToken;
if (fileRedirectionToken != null || redirectionToken as InputRedirectionToken != null)
{
ExpressionAst singleCommandArgument = this.GetSingleCommandArgument(Parser.CommandArgumentContext.FileName);
if (singleCommandArgument == null)
{
this.ReportError(Parser.After(redirectionToken), ParserStrings.MissingFileSpecification, new object[0]);
singleCommandArgument = new ErrorExpressionAst(redirectionToken.Extent, null);
}
if (fileRedirectionToken != null)
{
fileRedirectionAst = new FileRedirectionAst(Parser.ExtentOf(fileRedirectionToken, singleCommandArgument), fileRedirectionToken.FromStream, singleCommandArgument, fileRedirectionToken.Append);
}
else
{
object[] text = new object[1];
text[0] = redirectionToken.Text;
this.ReportError(redirectionToken.Extent, ParserStrings.RedirectionNotSupported, text);
extent = Parser.ExtentOf(redirectionToken, singleCommandArgument);
return null;
}
}
else
{
MergingRedirectionToken mergingRedirectionToken = (MergingRedirectionToken)redirectionToken;
RedirectionStream fromStream = mergingRedirectionToken.FromStream;
RedirectionStream toStream = mergingRedirectionToken.ToStream;
if (toStream == RedirectionStream.Output)
{
if (fromStream == toStream)
{
object[] objArray = new object[1];
objArray[0] = mergingRedirectionToken.Text;
this.ReportError(redirectionToken.Extent, ParserStrings.RedirectionNotSupported, objArray);
}
}
else
{
object[] text1 = new object[1];
text1[0] = mergingRedirectionToken.Text;
this.ReportError(redirectionToken.Extent, ParserStrings.RedirectionNotSupported, text1);
toStream = RedirectionStream.Output;
}
fileRedirectionAst = new MergingRedirectionAst(mergingRedirectionToken.Extent, mergingRedirectionToken.FromStream, toStream);
}
if (redirections[(int)fileRedirectionAst.FromStream] != null)
{
RedirectionStream redirectionStream = fileRedirectionAst.FromStream;
if (redirectionStream == RedirectionStream.All)
{
allStream = ParserStrings.AllStream;
}
else if (redirectionStream == RedirectionStream.Output)
{
allStream = ParserStrings.OutputStream;
}
else if (redirectionStream == RedirectionStream.Error)
{
allStream = ParserStrings.ErrorStream;
}
else if (redirectionStream == RedirectionStream.Warning)
{
allStream = ParserStrings.WarningStream;
}
else if (redirectionStream == RedirectionStream.Verbose)
{
allStream = ParserStrings.VerboseStream;
}
else if (redirectionStream == RedirectionStream.Debug)
{
allStream = ParserStrings.DebugStream;
}
else if (redirectionStream == RedirectionStream.Host)
{
allStream = ParserStrings.HostStream;
}
else
{
throw PSTraceSource.NewArgumentOutOfRangeException("result.FromStream", (object)fileRedirectionAst.FromStream);
}
object[] objArray1 = new object[1];
objArray1[0] = allStream;
this.ReportError(fileRedirectionAst.Extent, ParserStrings.StreamAlreadyRedirected, objArray1);
}
else
{
redirections[(int)fileRedirectionAst.FromStream] = fileRedirectionAst;
}
extent = fileRedirectionAst.Extent;
return fileRedirectionAst;
}
private PipelineBaseAst PipelineRule()
{
List<CommandBaseAst> source = new List<CommandBaseAst>();
IScriptExtent first = null;
Token token = null;
bool flag = true;
while (flag)
{
CommandBaseAst ast;
ExpressionAst ast2;
Token token2 = null;
TokenizerMode mode = this._tokenizer.Mode;
try
{
this.SetTokenizerMode(TokenizerMode.Expression);
ast2 = this.ExpressionRule();
if (ast2 != null)
{
Token token3 = this.PeekToken();
if (token3.Kind.HasTrait(TokenFlags.AssignmentOperator))
{
this.SkipToken();
token2 = token3;
}
}
}
finally
{
this.SetTokenizerMode(mode);
}
if (ast2 != null)
{
if (source.Any<CommandBaseAst>())
{
this.ReportError(ast2.Extent, ParserStrings.ExpressionsMustBeFirstInPipeline, new object[0]);
}
if (token2 != null)
{
this.SkipNewlines();
StatementAst right = this.StatementRule();
if (right == null)
{
IScriptExtent extent2 = After(token2);
this.ReportIncompleteInput(extent2, ParserStrings.ExpectedValueExpression, new object[] { token2.Kind.Text() });
right = new ErrorStatementAst(extent2, (IEnumerable<Ast>)null);
}
return new AssignmentStatementAst(ExtentOf((Ast)ast2, (Ast)right), ast2, token2.Kind, right, token2.Extent);
}
RedirectionAst[] redirections = null;
RedirectionToken redirectionToken = this.PeekToken() as RedirectionToken;
RedirectionAst ast4 = null;
while (redirectionToken != null)
{
this.SkipToken();
if (redirections == null)
{
redirections = new RedirectionAst[7];
}
IScriptExtent extent3 = null;
ast4 = this.RedirectionRule(redirectionToken, redirections, ref extent3);
redirectionToken = this.PeekToken() as RedirectionToken;
}
IScriptExtent extent = (ast4 != null) ? ExtentOf((Ast)ast2, (Ast)ast4) : ast2.Extent;
ast = new CommandExpressionAst(extent, ast2, (redirections != null) ? (from r in redirections
where r != null
select r) : null);
}
else
{
ast = this.CommandRule();
}
if (ast != null)
{
if (first == null)
{
first = ast.Extent;
}
source.Add(ast);
}
else if (source.Any<CommandBaseAst>() || (this.PeekToken().Kind == TokenKind.Pipe))
{
IScriptExtent extent5 = (token != null) ? After(token) : this.PeekToken().Extent;
this.ReportIncompleteInput(extent5, ParserStrings.EmptyPipeElement, new object[0]);
}
token = this.PeekToken();
switch (token.Kind)
{
case TokenKind.NewLine:
case TokenKind.EndOfInput:
case TokenKind.RParen:
case TokenKind.RCurly:
case TokenKind.Semi:
{
flag = false;
continue;
}
case TokenKind.AndAnd:
case TokenKind.OrOr:
{
this.SkipToken();
this.SkipNewlines();
this.ReportError(token.Extent, ParserStrings.InvalidEndOfLine, new object[] { token.Text });
if (this.PeekToken().Kind == TokenKind.EndOfInput)
{
flag = false;
}
continue;
}
case TokenKind.Pipe:
{
this.SkipToken();
this.SkipNewlines();
if (this.PeekToken().Kind == TokenKind.EndOfInput)
{
flag = false;
this.ReportIncompleteInput(After(token), ParserStrings.EmptyPipeElement, new object[0]);
}
continue;
}
}
this.ReportError(token.Extent, ParserStrings.UnexpectedToken, new object[] { token.Text });
flag = false;
}
if (source.Count == 0)
{
return null;
}
return new PipelineAst(ExtentOf(first, source[source.Count - 1]), source);
}
internal Ast CommandRule(bool forDynamicKeyword)
{
//G command:
//G command-name command-elements:opt
//G command-invocation-operator command-module:opt command-name-expr command-elements:opt
//G command-invocation-operator: one of
//G '&' '.'
//G command-module:
//G primary-expression
//G command-name:
//G generic-token
//G generic-token-with-subexpr
//G generic-token-with-subexpr: No whitespace is allowed between ) and command-name.
//G generic-token-with-subexpr-start statement-list:opt ) command-name
//G command-name-expr:
//G command-name
//G primary-expression
//G command-elements:
//G command-element
//G command-elements command-element
//G command-element:
//G command-parameter
//G command-argument
//G redirection
//G command-argument:
//G command-name-expr
Token firstToken;
bool dotSource, ampersand;
bool sawDashDash = false;
bool foundVerbatimArgument = false;
RedirectionAst[] redirections = null;
IScriptExtent endExtent;
var elements = new List<CommandElementAst>();
var oldTokenizerMode = _tokenizer.Mode;
try
{
SetTokenizerMode(TokenizerMode.Command);
Token token = NextToken();
firstToken = token;
endExtent = token.Extent;
dotSource = false;
ampersand = false;
CommandArgumentContext context;
if (token.Kind == TokenKind.Dot)
{
dotSource = true;
token = NextToken();
context = CommandArgumentContext.CommandNameAfterInvocationOperator;
}
else if (token.Kind == TokenKind.Ampersand)
{
ampersand = true;
token = NextToken();
context = CommandArgumentContext.CommandNameAfterInvocationOperator;
}
else
{
context = CommandArgumentContext.CommandName;
}
bool scanning = true;
while (scanning)
{
switch (token.Kind)
{
case TokenKind.Pipe:
case TokenKind.RCurly:
case TokenKind.RParen:
case TokenKind.EndOfInput:
case TokenKind.NewLine:
case TokenKind.Semi:
case TokenKind.AndAnd:
case TokenKind.OrOr:
UngetToken(token);
scanning = false;
continue;
case TokenKind.Ampersand:
// ErrorRecovery: just ignore the token.
endExtent = token.Extent;
ReportError(token.Extent, () => ParserStrings.AmpersandNotAllowed);
break;
case TokenKind.MinusMinus:
endExtent = token.Extent;
// Add the first -- as a parameter, which is then ignored when constructing the command processor unless it's a native
// command. All subsequent -- are added as arguments.
elements.Add(sawDashDash
? (CommandElementAst)new StringConstantExpressionAst(token.Extent, token.Text, StringConstantType.BareWord)
: new CommandParameterAst(token.Extent, "-", null, token.Extent));
sawDashDash = true;
break;
case TokenKind.Comma:
endExtent = token.Extent;
ReportError(token.Extent, () => ParserStrings.MissingArgument);
SkipNewlines();
break;
case TokenKind.Parameter:
if ((context & CommandArgumentContext.CommandName) != 0 || sawDashDash)
{
endExtent = token.Extent;
token.TokenFlags |= TokenFlags.CommandName;
var commandName = new StringConstantExpressionAst(token.Extent, token.Text, StringConstantType.BareWord);
elements.Add(commandName);
break;
}
var parameterToken = (ParameterToken)token;
ExpressionAst parameterArgs;
IScriptExtent extent;
// If the next token is a comma, don't grab it as part of the argument. The next time through this
// loop will issue an error.
if (parameterToken.UsedColon && PeekToken().Kind != TokenKind.Comma)
{
parameterArgs = GetCommandArgument(CommandArgumentContext.CommandArgument, NextToken());
if (parameterArgs == null)
{
extent = parameterToken.Extent;
ReportError(After(extent), () => ParserStrings.ParameterRequiresArgument, parameterToken.Text);
}
else
{
extent = ExtentOf(token, parameterArgs);
}
}
else
{
parameterArgs = null;
extent = token.Extent;
}
endExtent = extent;
var paramAst = new CommandParameterAst(extent, parameterToken.ParameterName, parameterArgs, token.Extent);
elements.Add(paramAst);
break;
case TokenKind.Redirection:
case TokenKind.RedirectInStd:
if ((context & CommandArgumentContext.CommandName) == 0)
{
if (redirections == null)
{
redirections = new RedirectionAst[CommandBaseAst.MaxRedirections];
}
RedirectionRule((RedirectionToken)token, redirections, ref endExtent);
}
else
{
// For backwards compatibility, we allow redirection operators as command names.
// V2 did not allow:
// & <<
// but V3 and on will because it falls out rather naturally here.
endExtent = token.Extent;
elements.Add(new StringConstantExpressionAst(token.Extent, token.Text, StringConstantType.BareWord));
}
break;
default:
if (token.Kind == TokenKind.InlineScript && context == CommandArgumentContext.CommandName)
{
scanning = InlineScriptRule(token, elements);
Diagnostics.Assert(elements.Count >= 1, "We should at least have the command name: inlinescript");
endExtent = elements.Last().Extent;
if (!scanning) { continue; }
}
else
{
var ast = GetCommandArgument(context, token);
// If this is the special verbatim argument syntax, look for the next element
StringToken argumentToken = token as StringToken;
if ((argumentToken != null) && String.Equals(argumentToken.Value, VERBATIM_ARGUMENT, StringComparison.OrdinalIgnoreCase))
{
elements.Add(ast);
endExtent = ast.Extent;
var verbatimToken = GetVerbatimCommandArgumentToken();
if (verbatimToken != null)
{
foundVerbatimArgument = true;
scanning = false;
ast = new StringConstantExpressionAst(verbatimToken.Extent, verbatimToken.Value, StringConstantType.BareWord);
elements.Add(ast);
endExtent = ast.Extent;
}
break;
}
endExtent = ast.Extent;
elements.Add(ast);
}
break;
}
if (!foundVerbatimArgument)
{
context = CommandArgumentContext.CommandArgument;
token = NextToken();
}
}
}
finally
{
SetTokenizerMode(oldTokenizerMode);
}
if (elements.Count == 0)
{
Diagnostics.Assert(!forDynamicKeyword, "DynamicKeyword should have command name at least");
if (dotSource || ampersand)
{
IScriptExtent extent = firstToken.Extent;
ReportError(extent, () => ParserStrings.MissingExpression, firstToken.Text);
}
return null;
}
if (forDynamicKeyword)
{
// TODO: report error if any redirections
return new DynamicKeywordStatementAst(ExtentOf(firstToken, endExtent), elements);
}
return new CommandAst(ExtentOf(firstToken, endExtent), elements,
dotSource || ampersand ? firstToken.Kind : TokenKind.Unknown,
redirections != null ? redirections.Where(r => r != null) : null);
}
private RedirectionAst RedirectionRule(RedirectionToken redirectionToken, RedirectionAst[] redirections, ref IScriptExtent extent)
{
//G redirections:
//G redirection
//G redirections redirection
//G redirection:
//G merging-redirection-operator
//G file-redirection-operator redirected-file-name
//G redirected-file-name:
//G command-argument
//G primary-expression
RedirectionAst result;
var fileRedirectionToken = redirectionToken as FileRedirectionToken;
if (fileRedirectionToken != null || (redirectionToken is InputRedirectionToken))
{
// get location
var filename = GetSingleCommandArgument(CommandArgumentContext.FileName);
if (filename == null)
{
// ErrorRecovery: Just pretend we have a filename and continue parsing.
ReportError(After(redirectionToken), () => ParserStrings.MissingFileSpecification);
filename = new ErrorExpressionAst(redirectionToken.Extent);
}
if (fileRedirectionToken == null)
{
// Must be an input redirection
ReportError(redirectionToken.Extent, () => ParserStrings.RedirectionNotSupported, redirectionToken.Text);
extent = ExtentOf(redirectionToken, filename);
return null;
}
result = new FileRedirectionAst(ExtentOf(fileRedirectionToken, filename), fileRedirectionToken.FromStream,
filename, fileRedirectionToken.Append);
}
else
{
var mergingRedirectionToken = (MergingRedirectionToken)redirectionToken;
RedirectionStream fromStream = mergingRedirectionToken.FromStream;
RedirectionStream toStream = mergingRedirectionToken.ToStream;
if (toStream != RedirectionStream.Output)
{
// Have we seen something like 1>&2 or 2>&3
// ErrorRecovery: This is just a semantic error, so no special recovery.
ReportError(redirectionToken.Extent, () => ParserStrings.RedirectionNotSupported, mergingRedirectionToken.Text);
toStream = RedirectionStream.Output;
}
else if (fromStream == toStream)
{
// Make sure 1>&1, 2>&2, etc. is an error.
// ErrorRecovery: This is just a semantic error, so no special recovery.
ReportError(redirectionToken.Extent, () => ParserStrings.RedirectionNotSupported, mergingRedirectionToken.Text);
}
result = new MergingRedirectionAst(mergingRedirectionToken.Extent, mergingRedirectionToken.FromStream, toStream);
}
if (redirections[(int)result.FromStream] == null)
{
redirections[(int)result.FromStream] = result;
}
else
{
string errorStream;
switch (result.FromStream)
{
case RedirectionStream.All: errorStream = ParserStrings.AllStream; break;
case RedirectionStream.Output: errorStream = ParserStrings.OutputStream; break;
case RedirectionStream.Error: errorStream = ParserStrings.ErrorStream; break;
case RedirectionStream.Warning: errorStream = ParserStrings.WarningStream; break;
case RedirectionStream.Verbose: errorStream = ParserStrings.VerboseStream; break;
case RedirectionStream.Debug: errorStream = ParserStrings.DebugStream; break;
case RedirectionStream.Information: errorStream = ParserStrings.InformationStream; break;
default:
throw PSTraceSource.NewArgumentOutOfRangeException("result.FromStream", result.FromStream);
}
ReportError(result.Extent, () => ParserStrings.StreamAlreadyRedirected, errorStream);
}
extent = result.Extent;
return result;
}
private PipelineBaseAst PipelineRule()
{
//G pipeline:
//G assignment-expression
//G expression redirections:opt pipeline-tail:opt
//G command pipeline-tail:opt
//G
//G assignment-expression:
//G expression assignment-operator statement
//G
//G pipeline-tail:
//G '|' new-lines:opt command
//G '|' new-lines:opt command pipeline-tail
var pipelineElements = new List<CommandBaseAst>();
IScriptExtent startExtent = null;
Token pipeToken = null;
bool scanning = true;
while (scanning)
{
CommandBaseAst commandAst;
Token assignToken = null;
ExpressionAst expr;
var oldTokenizerMode = _tokenizer.Mode;
try
{
SetTokenizerMode(TokenizerMode.Expression);
expr = ExpressionRule();
if (expr != null)
{
// We peek here because we are in expression mode, otherwise =0 will get scanned
// as a single token.
var token = PeekToken();
if (token.Kind.HasTrait(TokenFlags.AssignmentOperator))
{
SkipToken();
assignToken = token;
}
}
}
finally
{
SetTokenizerMode(oldTokenizerMode);
}
if (expr != null)
{
if (pipelineElements.Count > 0)
{
// ErrorRecovery: this is a semantic error, so just keep parsing.
ReportError(expr.Extent, () => ParserStrings.ExpressionsMustBeFirstInPipeline);
}
if (assignToken != null)
{
SkipNewlines();
StatementAst statement = StatementRule();
if (statement == null)
{
// ErrorRecovery: we are very likely at EOF because pretty much anything should result in some
// pipeline, so just keep parsing.
IScriptExtent errorExtent = After(assignToken);
ReportIncompleteInput(errorExtent, () => ParserStrings.ExpectedValueExpression, assignToken.Kind.Text());
statement = new ErrorStatementAst(errorExtent);
}
return new AssignmentStatementAst(ExtentOf(expr, statement),
expr, assignToken.Kind, statement, assignToken.Extent);
}
RedirectionAst[] redirections = null;
var redirectionToken = PeekToken() as RedirectionToken;
RedirectionAst lastRedirection = null;
while (redirectionToken != null)
{
SkipToken();
if (redirections == null)
{
redirections = new RedirectionAst[CommandBaseAst.MaxRedirections];
}
IScriptExtent unused = null;
lastRedirection = RedirectionRule(redirectionToken, redirections, ref unused);
redirectionToken = PeekToken() as RedirectionToken;
}
var exprExtent = lastRedirection != null ? ExtentOf(expr, lastRedirection) : expr.Extent;
commandAst = new CommandExpressionAst(exprExtent, expr,
redirections != null ? redirections.Where(r => r != null) : null);
}
else
{
commandAst = (CommandAst)CommandRule(forDynamicKeyword: false);
}
if (commandAst != null)
{
if (startExtent == null)
{
startExtent = commandAst.Extent;
}
pipelineElements.Add(commandAst);
}
else if (pipelineElements.Count > 0 || PeekToken().Kind == TokenKind.Pipe)
{
// ErrorRecovery: just fall through
// If the first pipe element is null, the position points to the pipe (ideally it would
// point before, but the pipe could be the first character), otherwise the empty element
// is after the pipe character.
IScriptExtent errorPosition = pipeToken != null ? After(pipeToken) : PeekToken().Extent;
ReportIncompleteInput(errorPosition, () => ParserStrings.EmptyPipeElement);
}
pipeToken = PeekToken();
switch (pipeToken.Kind)
{
case TokenKind.Semi:
case TokenKind.NewLine:
case TokenKind.RParen:
case TokenKind.RCurly:
case TokenKind.EndOfInput:
scanning = false;
continue;
case TokenKind.Pipe:
SkipToken();
SkipNewlines();
if (PeekToken().Kind == TokenKind.EndOfInput)
{
scanning = false;
ReportIncompleteInput(After(pipeToken), () => ParserStrings.EmptyPipeElement);
}
break;
case TokenKind.AndAnd:
case TokenKind.OrOr:
// Parse in a manner similar to a pipe, but issue an error (for now, but should implement this for V3.)
SkipToken();
SkipNewlines();
ReportError(pipeToken.Extent, () => ParserStrings.InvalidEndOfLine, pipeToken.Text);
if (PeekToken().Kind == TokenKind.EndOfInput)
{
scanning = false;
}
break;
default:
// ErrorRecovery: don't eat the token, assume it belongs to something else.
ReportError(pipeToken.Extent, () => ParserStrings.UnexpectedToken, pipeToken.Text);
scanning = false;
break;
}
}
if (pipelineElements.Count == 0)
{
return null;
}
return new PipelineAst(ExtentOf(startExtent, pipelineElements[pipelineElements.Count - 1]), pipelineElements);
}