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(Closes GH-8): In switch statements the default can appear anywhere (doesn't have to be last, who knew?). This was breaking the conversion to if..then..else. Added code to save away the default section separately.

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This commit is contained in:
Kevin Glynn 2011-03-13 10:42:34 +01:00
parent 1c7101207d
commit 9a1febb5a9
1 changed files with 52 additions and 21 deletions

73
CSharpTranslator/antlr3/src/CS2JTranslator/CS2JTransform/NetMaker.g

@ -302,20 +302,45 @@ scope PrimitiveRep {
protected int dummyForeachVarCtr = 0;
protected int dummyStaticConstructorCatchVarCtr = 0;
protected CommonTree convertSectionsToITE(List sections) {
// It turns out that 'default:' doesn't have to be last in the switch statement, so
// we need some jiggery pokery when converting to if-then-else.
// If there was a default section then 'defaultTree' will be non-null and 'sections'
// will have a null entry (the hole where the default section appeared).
protected CommonTree convertSectionsToITE(List sections, CommonTree defaultTree) {
CommonTree ret = null;
if (sections != null && sections.Count > 0) {
if ((sections == null || sections.Count == 1) && defaultTree != null) {
// We just had a default section, so emit it.
ret = dupTree(defaultTree);
}
else if (sections != null) {
int startidx = sections.Count - 2;
if (defaultTree != null) {
// must have at least if .. then .. else
// wrap default in else { }
IToken tok = defaultTree.Token;
CommonTree root = (CommonTree)adaptor.Nil;
adaptor.AddChild(root, (CommonTree)adaptor.Create(ELSE, tok, "else"));
adaptor.AddChild(root, (CommonTree)adaptor.Create(OPEN_BRACE, tok, "{"));
adaptor.AddChild(root, dupTree(defaultTree));
adaptor.AddChild(root, (CommonTree)adaptor.Create(CLOSE_BRACE, tok, "}"));
ret = root;
startidx = sections.Count - 1;
}
else {
ret = dupTree((CommonTree)sections[sections.Count - 1]);
for(int i = sections.Count - 2; i >= 0; i--) {
CommonTree section = dupTree((CommonTree)sections[i]);
// section is either ^(IF ...) or "else ^(IF ....)" we need to insert ret into the IF
if (section.IsNil) {
}
for(int i = startidx; i >= 0; i--) {
if (sections[i] != null) {
CommonTree section = dupTree((CommonTree)sections[i]);
// section is either ^(IF ...) or "else ^(IF ....)" we need to insert ret into the IF
if (section.IsNil) {
section.Children[section.Children.Count-1].AddChild(ret);
}
else {
}
else {
section.AddChild(ret);
}
ret = section;
}
ret = section;
}
}
}
return ret;
@ -1944,12 +1969,14 @@ scope {
bool convertToIfThenElse;
string scrutVar;
bool isFirstCase;
CommonTree defaultTree;
}
@init {
$switch_statement::isEnum = false;
$switch_statement::convertToIfThenElse = false;
$switch_statement::scrutVar = "WHOOPS";
$switch_statement::isFirstCase = true;
$switch_statement::defaultTree = null;
}:
^(s='switch' se=expression sv=magicScrutineeVar[$s.token]
{
@ -1964,7 +1991,7 @@ scope {
// TODO: down the line, check if scrutinee is already a var and reuse that.
// TYPE{ String } ret ;
^(TYPE[$s.token, "TYPE"] IDENTIFIER[$s.token,$expression.dotNetType.Java]) $sv ASSIGN[$s.token, "="] { dupTree($se.tree) } SEMI[$s.token, ";"]
{ convertSectionsToITE($ss) }
{ convertSectionsToITE($ss, $switch_statement::defaultTree) }
-> ^($s expression $ss*)
;
fixed_statement:
@ -2034,17 +2061,21 @@ else_statement:
switch_section
@init {
bool defaultSection = false;
bool isFirstCase = $switch_statement::isFirstCase;
}
@after{
$switch_statement::isFirstCase = false;
}:
^(s=SWITCH_SECTION ({$switch_statement::convertToIfThenElse}? ite_switch_labels | switch_labels) sl=statement_list)
{
}
-> {$switch_statement::convertToIfThenElse && $switch_statement::isFirstCase && $ite_switch_labels.isDefault}? { stripFinalBreak($sl.tree) }
-> {$switch_statement::convertToIfThenElse && $ite_switch_labels.isDefault}? ELSE[$s.token, "else"] OPEN_BRACE[$s.token, "{"] { stripFinalBreak($sl.tree) } CLOSE_BRACE[$s.token, "}"]
-> {$switch_statement::convertToIfThenElse && $switch_statement::isFirstCase}? ^(IF[$s.token, "if"] ite_switch_labels SEP OPEN_BRACE[$s.token, "{"] { stripFinalBreak($sl.tree) } CLOSE_BRACE[$s.token, "}"])
:
^(s=SWITCH_SECTION ({$switch_statement::convertToIfThenElse}? ite_switch_labels | switch_labels) sl=statement_list
{ if ($switch_statement::convertToIfThenElse && $ite_switch_labels.isDefault) {
$switch_statement::defaultTree = stripFinalBreak($sl.tree);
} else {
$switch_statement::isFirstCase = false;
}
}
)
-> {$switch_statement::convertToIfThenElse && $ite_switch_labels.isDefault}?
// -> {$switch_statement::convertToIfThenElse && $ite_switch_labels.isDefault}? ELSE[$s.token, "else"] OPEN_BRACE[$s.token, "{"] { stripFinalBreak($sl.tree) } CLOSE_BRACE[$s.token, "}"]
-> {$switch_statement::convertToIfThenElse && isFirstCase}? ^(IF[$s.token, "if"] ite_switch_labels SEP OPEN_BRACE[$s.token, "{"] { stripFinalBreak($sl.tree) } CLOSE_BRACE[$s.token, "}"])
-> {$switch_statement::convertToIfThenElse}? ELSE[$s.token, "else"] ^(IF[$s.token, "if"] ite_switch_labels SEP OPEN_BRACE[$s.token, "{"] { stripFinalBreak($sl.tree) } CLOSE_BRACE[$s.token, "}"])
-> ^($s switch_labels statement_list)
;