//---------------------------------------------------------------------------------------
// ParseSwitchStatement
//
// SwitchStatement :
// 'switch' '(' Expression ')' '{' CaseBlock '}'
//
// CaseBlock :
// CaseList DefaultCaseClause CaseList
//
// CaseList :
// <empty> |
// CaseClause CaseList
//
// CaseClause :
// 'case' Expression ':' OptionalStatements
//
// DefaultCaseClause :
// <empty> |
// 'default' ':' OptionalStatements
//---------------------------------------------------------------------------------------
private AST ParseSwitchStatement(){
Context switchCtx = this.currentToken.Clone();
AST expr = null;
ASTList cases = null;
this.blockType.Add(BlockType.Switch);
try{
// read switch(expr)
GetNextToken();
if (JSToken.LeftParen != this.currentToken.token)
ReportError(JSError.NoLeftParen);
GetNextToken();
this.noSkipTokenSet.Add(NoSkipTokenSet.s_BlockConditionNoSkipTokenSet);
this.noSkipTokenSet.Add(NoSkipTokenSet.s_SwitchNoSkipTokenSet);
try{
expr = ParseExpression();
if (JSToken.RightParen != this.currentToken.token){
ReportError(JSError.NoRightParen);
}
GetNextToken();
if (JSToken.LeftCurly != this.currentToken.token){
ReportError(JSError.NoLeftCurly);
}
GetNextToken();
}catch(RecoveryTokenException exc){
if (IndexOfToken(NoSkipTokenSet.s_BlockConditionNoSkipTokenSet, exc) == -1
&& IndexOfToken(NoSkipTokenSet.s_SwitchNoSkipTokenSet, exc) == -1 ){
// give up
exc._partiallyComputedNode = null;
throw exc;
}else{
if (exc._partiallyComputedNode == null)
expr = new ConstantWrapper(true, CurrentPositionContext());
else
expr = exc._partiallyComputedNode;
if (IndexOfToken(NoSkipTokenSet.s_BlockConditionNoSkipTokenSet, exc) != -1){
if (exc._token == JSToken.RightParen)
GetNextToken();
if (JSToken.LeftCurly != this.currentToken.token){
ReportError(JSError.NoLeftCurly);
}
GetNextToken();
}
}
}finally{
this.noSkipTokenSet.Remove(NoSkipTokenSet.s_SwitchNoSkipTokenSet);
this.noSkipTokenSet.Remove(NoSkipTokenSet.s_BlockConditionNoSkipTokenSet);
}
// parse the switch body
cases = new ASTList(this.currentToken.Clone());
bool defaultStatement = false;
this.noSkipTokenSet.Add(NoSkipTokenSet.s_BlockNoSkipTokenSet);
try{
while (JSToken.RightCurly != this.currentToken.token){
SwitchCase caseClause = null;
AST caseValue = null;
Context caseCtx = this.currentToken.Clone();
this.noSkipTokenSet.Add(NoSkipTokenSet.s_CaseNoSkipTokenSet);
try{
if (JSToken.Case == this.currentToken.token){
// get the case
GetNextToken();
caseValue = ParseExpression();
}else if (JSToken.Default == this.currentToken.token){
// get the default
if (defaultStatement)
// we report an error but we still accept the default
ReportError(JSError.DupDefault, true);
else
defaultStatement = true;
GetNextToken();
}else{
// This is an error, there is no case or default. Assume a default was missing and keep going
defaultStatement = true;
ReportError(JSError.BadSwitch);
}
if (JSToken.Colon != this.currentToken.token)
ReportError(JSError.NoColon);
// read the statements inside the case or default
GetNextToken();
}catch(RecoveryTokenException exc){
// right now we can only get here for the 'case' statement
if (IndexOfToken(NoSkipTokenSet.s_CaseNoSkipTokenSet, exc) == -1){
// ignore the current case or default
exc._partiallyComputedNode = null;
throw exc;
}else{
caseValue = exc._partiallyComputedNode;
if (exc._token == JSToken.Colon)
GetNextToken();
}
}finally{
this.noSkipTokenSet.Remove(NoSkipTokenSet.s_CaseNoSkipTokenSet);
}
this.blockType.Add(BlockType.Block);
try{
Block statements = new Block(this.currentToken.Clone());
this.noSkipTokenSet.Add(NoSkipTokenSet.s_SwitchNoSkipTokenSet);
this.noSkipTokenSet.Add(NoSkipTokenSet.s_StartStatementNoSkipTokenSet);
try{
while (JSToken.RightCurly != this.currentToken.token && JSToken.Case != this.currentToken.token && JSToken.Default != this.currentToken.token){
try{
statements.Append(ParseStatement());
}catch(RecoveryTokenException exc){
if (exc._partiallyComputedNode != null){
statements.Append(exc._partiallyComputedNode);
exc._partiallyComputedNode = null;
}
if (IndexOfToken(NoSkipTokenSet.s_StartStatementNoSkipTokenSet, exc) == -1)
throw exc;
}
}
}catch(RecoveryTokenException exc){
if (IndexOfToken(NoSkipTokenSet.s_SwitchNoSkipTokenSet, exc) == -1){
if (null == caseValue)
caseClause = new SwitchCase(caseCtx, statements);
else
caseClause = new SwitchCase(caseCtx, caseValue, statements);
cases.Append(caseClause);
throw exc;
}
}finally{
this.noSkipTokenSet.Remove(NoSkipTokenSet.s_StartStatementNoSkipTokenSet);
this.noSkipTokenSet.Remove(NoSkipTokenSet.s_SwitchNoSkipTokenSet);
}
if (JSToken.RightCurly == this.currentToken.token)
statements.context.UpdateWith(this.currentToken);
if (null == caseValue){
caseCtx.UpdateWith(statements.context);
caseClause = new SwitchCase(caseCtx, statements);
}else{
caseCtx.UpdateWith(statements.context);
caseClause = new SwitchCase(caseCtx, caseValue, statements);
}
cases.Append(caseClause);
}finally{
this.blockType.RemoveAt(this.blockType.Count - 1);
}
}
}catch(RecoveryTokenException exc){
if (IndexOfToken(NoSkipTokenSet.s_BlockNoSkipTokenSet, exc) == -1){
//save what you can a rethrow
switchCtx.UpdateWith(CurrentPositionContext());
exc._partiallyComputedNode = new Switch(switchCtx, expr, cases);
throw exc;
}
}finally{
this.noSkipTokenSet.Remove(NoSkipTokenSet.s_BlockNoSkipTokenSet);
}
switchCtx.UpdateWith(this.currentToken);
GetNextToken();
}finally{
this.blockType.RemoveAt(this.blockType.Count - 1);
}
return new Switch(switchCtx, expr, cases);
}
private AST ParseSwitchStatement()
{
Context context = this.currentToken.Clone();
AST expression = null;
ASTList cases = null;
this.blockType.Add(BlockType.Switch);
try
{
this.GetNextToken();
if (JSToken.LeftParen != this.currentToken.token)
{
this.ReportError(JSError.NoLeftParen);
}
this.GetNextToken();
this.noSkipTokenSet.Add(NoSkipTokenSet.s_BlockConditionNoSkipTokenSet);
this.noSkipTokenSet.Add(NoSkipTokenSet.s_SwitchNoSkipTokenSet);
try
{
expression = this.ParseExpression();
if (JSToken.RightParen != this.currentToken.token)
{
this.ReportError(JSError.NoRightParen);
}
this.GetNextToken();
if (JSToken.LeftCurly != this.currentToken.token)
{
this.ReportError(JSError.NoLeftCurly);
}
this.GetNextToken();
}
catch (RecoveryTokenException exception)
{
if ((this.IndexOfToken(NoSkipTokenSet.s_BlockConditionNoSkipTokenSet, exception) == -1) && (this.IndexOfToken(NoSkipTokenSet.s_SwitchNoSkipTokenSet, exception) == -1))
{
exception._partiallyComputedNode = null;
throw exception;
}
if (exception._partiallyComputedNode == null)
{
expression = new ConstantWrapper(true, this.CurrentPositionContext());
}
else
{
expression = exception._partiallyComputedNode;
}
if (this.IndexOfToken(NoSkipTokenSet.s_BlockConditionNoSkipTokenSet, exception) != -1)
{
if (exception._token == JSToken.RightParen)
{
this.GetNextToken();
}
if (JSToken.LeftCurly != this.currentToken.token)
{
this.ReportError(JSError.NoLeftCurly);
}
this.GetNextToken();
}
}
finally
{
this.noSkipTokenSet.Remove(NoSkipTokenSet.s_SwitchNoSkipTokenSet);
this.noSkipTokenSet.Remove(NoSkipTokenSet.s_BlockConditionNoSkipTokenSet);
}
cases = new ASTList(this.currentToken.Clone());
bool flag = false;
this.noSkipTokenSet.Add(NoSkipTokenSet.s_BlockNoSkipTokenSet);
try
{
while (JSToken.RightCurly != this.currentToken.token)
{
SwitchCase elem = null;
AST ast2 = null;
Context context2 = this.currentToken.Clone();
this.noSkipTokenSet.Add(NoSkipTokenSet.s_CaseNoSkipTokenSet);
try
{
if (JSToken.Case == this.currentToken.token)
{
this.GetNextToken();
ast2 = this.ParseExpression();
}
else if (JSToken.Default == this.currentToken.token)
{
if (flag)
{
this.ReportError(JSError.DupDefault, true);
}
else
{
flag = true;
}
this.GetNextToken();
}
else
{
flag = true;
this.ReportError(JSError.BadSwitch);
}
if (JSToken.Colon != this.currentToken.token)
{
this.ReportError(JSError.NoColon);
}
this.GetNextToken();
}
catch (RecoveryTokenException exception2)
{
if (this.IndexOfToken(NoSkipTokenSet.s_CaseNoSkipTokenSet, exception2) == -1)
{
exception2._partiallyComputedNode = null;
throw exception2;
}
ast2 = exception2._partiallyComputedNode;
if (exception2._token == JSToken.Colon)
{
this.GetNextToken();
}
}
finally
{
this.noSkipTokenSet.Remove(NoSkipTokenSet.s_CaseNoSkipTokenSet);
}
this.blockType.Add(BlockType.Block);
try
{
Block statements = new Block(this.currentToken.Clone());
this.noSkipTokenSet.Add(NoSkipTokenSet.s_SwitchNoSkipTokenSet);
this.noSkipTokenSet.Add(NoSkipTokenSet.s_StartStatementNoSkipTokenSet);
try
{
while (((JSToken.RightCurly != this.currentToken.token) && (JSToken.Case != this.currentToken.token)) && (JSToken.Default != this.currentToken.token))
{
try
{
statements.Append(this.ParseStatement());
continue;
}
catch (RecoveryTokenException exception3)
{
if (exception3._partiallyComputedNode != null)
{
statements.Append(exception3._partiallyComputedNode);
exception3._partiallyComputedNode = null;
}
if (this.IndexOfToken(NoSkipTokenSet.s_StartStatementNoSkipTokenSet, exception3) == -1)
{
throw exception3;
}
continue;
}
}
}
catch (RecoveryTokenException exception4)
{
if (this.IndexOfToken(NoSkipTokenSet.s_SwitchNoSkipTokenSet, exception4) == -1)
{
if (ast2 == null)
{
elem = new SwitchCase(context2, statements);
}
else
{
elem = new SwitchCase(context2, ast2, statements);
}
cases.Append(elem);
throw exception4;
}
}
finally
{
this.noSkipTokenSet.Remove(NoSkipTokenSet.s_StartStatementNoSkipTokenSet);
this.noSkipTokenSet.Remove(NoSkipTokenSet.s_SwitchNoSkipTokenSet);
}
if (JSToken.RightCurly == this.currentToken.token)
{
statements.context.UpdateWith(this.currentToken);
}
if (ast2 == null)
{
context2.UpdateWith(statements.context);
elem = new SwitchCase(context2, statements);
}
else
{
context2.UpdateWith(statements.context);
elem = new SwitchCase(context2, ast2, statements);
}
cases.Append(elem);
continue;
}
finally
{
this.blockType.RemoveAt(this.blockType.Count - 1);
}
}
}
catch (RecoveryTokenException exception5)
{
if (this.IndexOfToken(NoSkipTokenSet.s_BlockNoSkipTokenSet, exception5) == -1)
{
context.UpdateWith(this.CurrentPositionContext());
exception5._partiallyComputedNode = new Switch(context, expression, cases);
throw exception5;
}
}
finally
{
this.noSkipTokenSet.Remove(NoSkipTokenSet.s_BlockNoSkipTokenSet);
}
context.UpdateWith(this.currentToken);
this.GetNextToken();
}
finally
{
this.blockType.RemoveAt(this.blockType.Count - 1);
}
return new Switch(context, expression, cases);
}