//---------------------------------------------------------------------------------------
// ParseTryStatement
//
// TryStatement :
// 'try' Block CatchList Finally
//
// CatchList :
// <empty> |
// CatchList Catch
//
// Catch :
// 'catch' '(' Identifier Type ')' Block
//
// Finally :
// <empty> |
// 'finally' Block
//---------------------------------------------------------------------------------------
private AST ParseTryStatement(){
Context tryCtx = this.currentToken.Clone();
Context tryEndContext = null;
AST body = null;
AST id = null;
AST handler = null;
AST finally_block = null;
RecoveryTokenException excInFinally = null;
TypeExpression type = null;
this.blockType.Add(BlockType.Block);
try{
bool catchOrFinally = false;
bool foundCatchAll = false;
GetNextToken();
if (JSToken.LeftCurly != this.currentToken.token)
ReportError(JSError.NoLeftCurly);
this.noSkipTokenSet.Add(NoSkipTokenSet.s_NoTrySkipTokenSet);
try{
body = ParseBlock(out tryEndContext);
}catch(RecoveryTokenException exc){
if (IndexOfToken(NoSkipTokenSet.s_NoTrySkipTokenSet, exc) == -1)
// do nothing and just return the containing block, if any
throw exc;
else
body = exc._partiallyComputedNode;
}finally{
this.noSkipTokenSet.Remove(NoSkipTokenSet.s_NoTrySkipTokenSet);
}
while (JSToken.Catch == this.currentToken.token){
this.noSkipTokenSet.Add(NoSkipTokenSet.s_NoTrySkipTokenSet);
try{
if (handler != null){
body = new Try(tryCtx, body, id, type, handler, null, false, tryEndContext);
id = null;
type = null;
handler = null;
}
catchOrFinally = true;
GetNextToken();
if (JSToken.LeftParen != this.currentToken.token)
ReportError(JSError.NoLeftParen);
GetNextToken();
if (JSToken.Identifier != this.currentToken.token){
string identifier = JSKeyword.CanBeIdentifier(this.currentToken.token);
if (null != identifier){
ForceReportInfo(JSError.KeywordUsedAsIdentifier);
id = new Lookup(identifier, this.currentToken.Clone());
}else{
ReportError(JSError.NoIdentifier);
id = new Lookup("##Exc##" + s_cDummyName++, CurrentPositionContext());
}
}else
id = new Lookup(this.scanner.GetIdentifier(), this.currentToken.Clone());
GetNextToken();
this.noSkipTokenSet.Add(NoSkipTokenSet.s_BlockConditionNoSkipTokenSet);
try{
if (JSToken.Colon == this.currentToken.token)
type = ParseTypeExpression();
else{
if (foundCatchAll) //no point in having another
ForceReportInfo(id.context, JSError.UnreachableCatch);
foundCatchAll = true;
}
if (JSToken.RightParen != this.currentToken.token)
ReportError(JSError.NoRightParen);
GetNextToken();
}catch(RecoveryTokenException exc){
if (IndexOfToken(NoSkipTokenSet.s_BlockConditionNoSkipTokenSet, exc) == -1){
exc._partiallyComputedNode = null;
// rethrow
throw exc;
}else{
type = (TypeExpression)exc._partiallyComputedNode;
if (this.currentToken.token == JSToken.RightParen)
GetNextToken();
}
}finally{
this.noSkipTokenSet.Remove(NoSkipTokenSet.s_BlockConditionNoSkipTokenSet);
}
if (JSToken.LeftCurly != this.currentToken.token)
ReportError(JSError.NoLeftCurly);
handler = ParseBlock();
tryCtx.UpdateWith(handler.context);
}catch(RecoveryTokenException exc){
if (exc._partiallyComputedNode == null)
handler = new Block(CurrentPositionContext());
else
handler = exc._partiallyComputedNode;
if (IndexOfToken(NoSkipTokenSet.s_NoTrySkipTokenSet, exc) == -1){
Debug.Assert((type == null) ? exc._partiallyComputedNode == null : true);
if (type != null)
exc._partiallyComputedNode = new Try(tryCtx, body, id, type, handler, null, false, tryEndContext);
throw exc;
}
}finally{
this.noSkipTokenSet.Remove(NoSkipTokenSet.s_NoTrySkipTokenSet);
}
}
try{
if (JSToken.Finally == this.currentToken.token){
GetNextToken();
this.blockType.Add(BlockType.Finally);
try{
finally_block = ParseBlock();
catchOrFinally = true;
}finally{
this.blockType.RemoveAt(this.blockType.Count - 1);
}
tryCtx.UpdateWith(finally_block.context);
}
}catch(RecoveryTokenException exc){
excInFinally = exc; // thrown later so we can execute code below
}
if (!catchOrFinally){
ReportError(JSError.NoCatch, true);
finally_block = new Block(CurrentPositionContext()); // make a dummy empty block
}
}finally{
this.blockType.RemoveAt(this.blockType.Count - 1);
}
bool isFinallyEscaped = false;
if (this.finallyEscaped > 0){
this.finallyEscaped--;
isFinallyEscaped = true;
}
if (excInFinally != null){
excInFinally._partiallyComputedNode = new Try(tryCtx, body, id, type, handler, finally_block, isFinallyEscaped, tryEndContext);
throw excInFinally;
}else
return new Try(tryCtx, body, id, type, handler, finally_block, isFinallyEscaped, tryEndContext);
}
/**
* Whether the "catch (e: e instanceof Exception) { ... }" syntax
* is implemented.
*/
AST StatementHelper(AST parent)
{
AST pn = null;
// If skipsemi == true, don't add SEMI + EOL to source at the
// end of this statment. For compound statements, IF/FOR etc.
bool skip_semi = false;
int tt;
tt = ts.GetToken ();
if (tt == Token.IF) {
skip_semi = true;
decompiler.AddToken (Token.IF);
AST cond = Condition (parent);
decompiler.AddEOL (Token.LC);
AST if_true = Statement (parent);
AST if_false = null;
if (ts.MatchToken (Token.ELSE)) {
decompiler.AddToken (Token.RC);
decompiler.AddToken (Token.ELSE);
decompiler.AddEOL (Token.LC);
if_false = Statement (parent);
}
decompiler.AddEOL (Token.RC);
pn = new If (parent, cond, if_true, if_false, new Location (ts.SourceName, ts.LineNumber));
} else if (tt == Token.SWITCH) {
skip_semi = true;
decompiler.AddToken (Token.SWITCH);
pn = new Switch (parent, new Location (ts.SourceName, ts.LineNumber));
Clause cur_case;
MustMatchToken (Token.LP, "msg.no.paren.switch");
decompiler.AddToken (Token.LP);
((Switch) pn).exp = Expr (parent, false);
MustMatchToken (Token.RP, "msg.no.paren.after.switch");
decompiler.AddToken (Token.RP);
MustMatchToken (Token.LC, "msg.no.brace.switch");
decompiler.AddEOL (Token.LC);
ClauseType clause_type = ClauseType.Case;
while ((tt = ts.GetToken ()) != Token.RC && tt != Token.EOF) {
if (tt == Token.CASE) {
decompiler.AddToken (Token.CASE);
cur_case = new Clause (pn, new Location (ts.SourceName, ts.LineNumber));
cur_case.exp = Expr (pn, false);
decompiler.AddEOL (Token.COLON);
if (clause_type == ClauseType.Default)
clause_type = ClauseType.CaseAfterDefault;
} else if (tt == Token.DEFAULT) {
cur_case = null;
clause_type = ClauseType.Default;
decompiler.AddToken (Token.DEFAULT);
decompiler.AddEOL (Token.COLON);
} else {
cur_case = null;
ReportError ("msg.bad.switch");
}
MustMatchToken (Token.COLON, "msg.no.colon.case");
while ((tt = ts.PeekToken ()) != Token.RC && tt != Token.CASE && tt != Token.DEFAULT && tt != Token.EOF) {
if (clause_type == ClauseType.Case || clause_type == ClauseType.CaseAfterDefault)
cur_case.AddStm (Statement (pn));
else if (clause_type == ClauseType.Default)
((Switch) pn).default_clauses.Add (Statement (pn));
}
((Switch) pn).AddClause (cur_case, clause_type);
}
decompiler.AddEOL (Token.RC);
} else if (tt == Token.WHILE) {
skip_semi = true;
decompiler.AddToken (Token.WHILE);
While w = new While (new Location (ts.SourceName, ts.LineNumber));
AST cond = Condition (w);
decompiler.AddEOL (Token.LC);
AST body = Statement (w);
decompiler.AddEOL (Token.RC);
w.Init (parent, cond, body);
pn = w;
} else if (tt == Token.DO) {
decompiler.AddToken (Token.DO);
decompiler.AddEOL (Token.LC);
int line_number = ts.LineNumber;
DoWhile do_while = new DoWhile (new Location (ts.SourceName, line_number));
AST body = Statement (do_while);
decompiler.AddToken (Token.RC);
MustMatchToken (Token.WHILE, "msg.no.while.do");
decompiler.AddToken (Token.WHILE);
AST cond = Condition (do_while);
do_while.Init (parent, body, cond);
pn = do_while;
} else if (tt == Token.FOR) {
skip_semi = true;
decompiler.AddToken (Token.FOR);
AST init, cond, incr = null, body;
MustMatchToken (Token.LP, "msg.no.paren.for");
decompiler.AddToken (Token.LP);
tt = ts.PeekToken ();
if (tt == Token.SEMI)
init = new EmptyAST ();
else {
if (tt == Token.VAR) {
// set init to a var list or initial
ts.GetToken (); // throw away the 'var' token
init = Variables (parent, true);
} else
init = Expr (parent, true);
}
if (ts.MatchToken (Token.IN)) {
decompiler.AddToken (Token.IN);
cond = Expr (parent, false); // 'cond' is the object over which we're iterating
} else {
// ordinary for loop
MustMatchToken (Token.SEMI, "msg.no.semi.for");
decompiler.AddToken (Token.SEMI);
if (ts.PeekToken () == Token.SEMI)
cond = new EmptyAST (); // no loop condition
else
cond = Expr (parent, false);
MustMatchToken (Token.SEMI, "msg.no.semi.for.cond");
decompiler.AddToken (Token.SEMI);
if (ts.PeekToken () == Token.RP)
incr = new EmptyAST ();
else
incr = Expr (parent, false);
}
MustMatchToken (Token.RP, "msg.no.paren.for.ctrl");
decompiler.AddToken (Token.RP);
decompiler.AddEOL (Token.LC);
body = Statement (pn);
decompiler.AddEOL (Token.RC);
if (incr == null) // cond could be null if 'in obj' got eaten by the init node.
pn = new ForIn (parent, init, cond, body, new Location (ts.SourceName, ts.LineNumber));
else
pn = new For (parent, init, cond, incr, body, new Location (ts.SourceName, ts.LineNumber));
body.PropagateParent (pn);
} else if (tt == Token.TRY) {
int line_number = ts.LineNumber;
AST try_block;
ArrayList catch_blocks = null;
AST finally_block = null;
skip_semi = true;
decompiler.AddToken (Token.TRY);
decompiler.AddEOL (Token.LC);
try_block = Statement (parent);
decompiler.AddEOL (Token.RC);
catch_blocks = new ArrayList ();
bool saw_default_catch = false;
int peek = ts.PeekToken ();
if (peek == Token.CATCH) {
while (ts.MatchToken (Token.CATCH)) {
if (saw_default_catch)
ReportError ("msg.catch.unreachable");
decompiler.AddToken (Token.CATCH);
MustMatchToken (Token.LP, "msg.no.paren.catch");
decompiler.AddToken (Token.LP);
MustMatchToken (Token.NAME, "msg.bad.catchcond");
string var_name = ts.GetString;
decompiler.AddName (var_name);
AST catch_cond = null;
if (ts.MatchToken (Token.IF)) {
decompiler.AddToken (Token.IF);
catch_cond = Expr (parent, false);
} else
saw_default_catch = true;
MustMatchToken (Token.RP, "msg.bad.catchcond");
decompiler.AddToken (Token.RP);
MustMatchToken (Token.LC, "msg.no.brace.catchblock");
decompiler.AddEOL (Token.LC);
catch_blocks.Add (new Catch (var_name, catch_cond,
Statements (null), parent, new Location (ts.SourceName, line_number)));
MustMatchToken (Token.RC, "msg.no.brace.after.body");
decompiler.AddEOL (Token.RC);
}
} else if (peek != Token.FINALLY)
MustMatchToken (Token.FINALLY, "msg.try.no.catchfinally");
if (ts.MatchToken (Token.FINALLY)) {
decompiler.AddToken (Token.FINALLY);
decompiler.AddEOL (Token.LC);
finally_block = Statement (parent);
decompiler.AddEOL (Token.RC);
}
pn = new Try (try_block, catch_blocks, finally_block, parent, new Location (ts.SourceName, ts.LineNumber));
} else if (tt == Token.THROW) {
int line_number = ts.LineNumber;
decompiler.AddToken (Token.THROW);
pn = new Throw (Expr (parent, false), new Location (ts.SourceName, ts.LineNumber));
if (line_number == ts.LineNumber)
CheckWellTerminated ();
} else if (tt == Token.BREAK) {
decompiler.AddToken (Token.BREAK);
// MatchLabel only matches if there is one
string label = MatchLabel ();
if (label != null)
decompiler.AddName (label);
pn = new Break (parent, label, new Location (ts.SourceName, ts.LineNumber));
} else if (tt == Token.CONTINUE) {
decompiler.AddToken (Token.CONTINUE);
// MatchLabel only matches if there is one
string label = MatchLabel ();
if (label != null)
decompiler.AddName (label);
pn = new Continue (parent, label, new Location (ts.SourceName, ts.LineNumber));
} else if (tt == Token.WITH) {
skip_semi = true;
decompiler.AddToken (Token.WITH);
MustMatchToken (Token.LP, "msg.no.paren.with");
decompiler.AddToken (Token.LP);
AST obj = Expr (parent, false);
MustMatchToken (Token.RP, "msg.no.paren.after.with");
decompiler.AddToken (Token.RP);
decompiler.AddToken (Token.LC);
++nesting_of_with;
AST body;
try {
body = Statement (parent);
} finally {
--nesting_of_with;
}
decompiler.AddEOL (Token.RC);
pn = new With (parent, obj, body, new Location (ts.SourceName, ts.LineNumber));
} else if (tt == Token.VAR) {
int line_number = ts.LineNumber;
pn = Variables (parent, false);
if (ts.LineNumber == line_number)
CheckWellTerminated ();
} else if (tt == Token.RETURN) {
AST ret_expr = null;
decompiler.AddToken (Token.RETURN);
pn = new Return (new Location (ts.SourceName, ts.LineNumber));
if (!InsideFunction)
ReportError ("msg.bad.return");
/* This is ugly, but we don't want to require a semicolon. */
ts.allow_reg_exp = true;
tt = ts.PeekTokenSameLine ();
ts.allow_reg_exp = false;
int line_number = ts.LineNumber;
if (tt != Token.EOF && tt != Token.EOL && tt != Token.SEMI && tt != Token.RC) {
ret_expr = Expr (pn, false);
if (ts.LineNumber == line_number)
CheckWellTerminated ();
}
((Return) pn).Init (parent, ret_expr);
} else if (tt == Token.LC) {
skip_semi = true;
pn = Statements (parent);
MustMatchToken (Token.RC, "msg.no.brace.block");
} else if (tt == Token.ERROR || tt == Token.EOL || tt == Token.SEMI) {
pn = new EmptyAST ();
skip_semi = true;
} else if (tt == Token.FUNCTION) {
pn = Function (parent, FunctionType.ExpressionStatement);
} else if (tt == Token.IMPORT) {
decompiler.AddToken (Token.IMPORT);
pn = Import (parent);
} else {
int last_expr_type = tt;
int token_number = ts.TokenNumber;
ts.UnGetToken (tt);
int line_number = ts.LineNumber;
pn = Expr (parent, false);
if (ts.PeekToken () == Token.COLON) {
/* check that the last thing the tokenizer returned was a
* NAME and that only one token was consumed.
*/
if (last_expr_type != Token.NAME || (ts.TokenNumber != token_number))
ReportError ("msg.bad.label");
ts.GetToken (); // eat the colon
string name = ts.GetString;
// bind 'Statement (pn)' to the label
Labelled labelled = new Labelled (parent, new Location (ts.SourceName, ts.LineNumber));
labelled.Init (parent, name, Statement (labelled), new Location (ts.SourceName, ts.LineNumber));
pn = labelled;
// depend on decompiling lookahead to guess that that
// last name was a label.
decompiler.AddEOL (Token.COLON);
return pn;
}
// FIXME:
// pn = nf.createExprStatement(pn, lineno);
if (ts.LineNumber == line_number)
CheckWellTerminated ();
}
ts.MatchToken (Token.SEMI);
if (!skip_semi)
decompiler.AddEOL (Token.SEMI);
return pn;
}
private AST ParseTryStatement()
{
Context context = this.currentToken.Clone();
Context closingBraceContext = null;
AST body = null;
AST identifier = null;
AST handler = null;
AST ast4 = null;
RecoveryTokenException exception = null;
TypeExpression type = null;
this.blockType.Add(BlockType.Block);
try
{
bool flag = false;
bool flag2 = false;
this.GetNextToken();
if (JSToken.LeftCurly != this.currentToken.token)
{
this.ReportError(JSError.NoLeftCurly);
}
this.noSkipTokenSet.Add(NoSkipTokenSet.s_NoTrySkipTokenSet);
try
{
try
{
body = this.ParseBlock(out closingBraceContext);
}
catch (RecoveryTokenException exception2)
{
if (this.IndexOfToken(NoSkipTokenSet.s_NoTrySkipTokenSet, exception2) == -1)
{
throw exception2;
}
body = exception2._partiallyComputedNode;
}
goto Label_02E5;
}
finally
{
this.noSkipTokenSet.Remove(NoSkipTokenSet.s_NoTrySkipTokenSet);
}
Label_00A6:
this.noSkipTokenSet.Add(NoSkipTokenSet.s_NoTrySkipTokenSet);
try
{
if (handler != null)
{
body = new Try(context, body, identifier, type, handler, null, false, closingBraceContext);
identifier = null;
type = null;
handler = null;
}
flag = true;
this.GetNextToken();
if (JSToken.LeftParen != this.currentToken.token)
{
this.ReportError(JSError.NoLeftParen);
}
this.GetNextToken();
if (JSToken.Identifier != this.currentToken.token)
{
string name = JSKeyword.CanBeIdentifier(this.currentToken.token);
if (name != null)
{
this.ForceReportInfo(JSError.KeywordUsedAsIdentifier);
identifier = new Lookup(name, this.currentToken.Clone());
}
else
{
this.ReportError(JSError.NoIdentifier);
identifier = new Lookup("##Exc##" + s_cDummyName++, this.CurrentPositionContext());
}
}
else
{
identifier = new Lookup(this.scanner.GetIdentifier(), this.currentToken.Clone());
}
this.GetNextToken();
this.noSkipTokenSet.Add(NoSkipTokenSet.s_BlockConditionNoSkipTokenSet);
try
{
if (JSToken.Colon == this.currentToken.token)
{
type = this.ParseTypeExpression();
}
else
{
if (flag2)
{
this.ForceReportInfo(identifier.context, JSError.UnreachableCatch);
}
flag2 = true;
}
if (JSToken.RightParen != this.currentToken.token)
{
this.ReportError(JSError.NoRightParen);
}
this.GetNextToken();
}
catch (RecoveryTokenException exception3)
{
if (this.IndexOfToken(NoSkipTokenSet.s_BlockConditionNoSkipTokenSet, exception3) == -1)
{
exception3._partiallyComputedNode = null;
throw exception3;
}
type = (TypeExpression) exception3._partiallyComputedNode;
if (this.currentToken.token == JSToken.RightParen)
{
this.GetNextToken();
}
}
finally
{
this.noSkipTokenSet.Remove(NoSkipTokenSet.s_BlockConditionNoSkipTokenSet);
}
if (JSToken.LeftCurly != this.currentToken.token)
{
this.ReportError(JSError.NoLeftCurly);
}
handler = this.ParseBlock();
context.UpdateWith(handler.context);
}
catch (RecoveryTokenException exception4)
{
if (exception4._partiallyComputedNode == null)
{
handler = new Block(this.CurrentPositionContext());
}
else
{
handler = exception4._partiallyComputedNode;
}
if (this.IndexOfToken(NoSkipTokenSet.s_NoTrySkipTokenSet, exception4) == -1)
{
if (type != null)
{
exception4._partiallyComputedNode = new Try(context, body, identifier, type, handler, null, false, closingBraceContext);
}
throw exception4;
}
}
finally
{
this.noSkipTokenSet.Remove(NoSkipTokenSet.s_NoTrySkipTokenSet);
}
Label_02E5:
if (JSToken.Catch == this.currentToken.token)
{
goto Label_00A6;
}
try
{
if (JSToken.Finally == this.currentToken.token)
{
this.GetNextToken();
this.blockType.Add(BlockType.Finally);
try
{
ast4 = this.ParseBlock();
flag = true;
}
finally
{
this.blockType.RemoveAt(this.blockType.Count - 1);
}
context.UpdateWith(ast4.context);
}
}
catch (RecoveryTokenException exception5)
{
exception = exception5;
}
if (!flag)
{
this.ReportError(JSError.NoCatch, true);
ast4 = new Block(this.CurrentPositionContext());
}
}
finally
{
this.blockType.RemoveAt(this.blockType.Count - 1);
}
bool finallyHasControlFlowOutOfIt = false;
if (this.finallyEscaped > 0)
{
this.finallyEscaped--;
finallyHasControlFlowOutOfIt = true;
}
if (exception != null)
{
exception._partiallyComputedNode = new Try(context, body, identifier, type, handler, ast4, finallyHasControlFlowOutOfIt, closingBraceContext);
throw exception;
}
return new Try(context, body, identifier, type, handler, ast4, finallyHasControlFlowOutOfIt, closingBraceContext);
}