Correctly defer this-resolution on ECMA6 fat-arrows.

[cycript.git] / Replace.cpp

diff --git a/Replace.cpp b/Replace.cpp
index d9465832fb980eb4ebfe9ecff0d2348600beb9b8..acf4d51527d63eb5910656c228e46b20cdfcd899 100644 (file)
--- a/Replace.cpp
+++ b/Replace.cpp
@@ -1,5 +1,5 @@
 /* Cycript - Optimizing JavaScript Compiler/Runtime
- * Copyright (C) 2009-2010  Jay Freeman (saurik)
+ * Copyright (C) 2009-2012  Jay Freeman (saurik)
 */
 
 /* GNU Lesser General Public License, Version 3 {{{ */
@@ -24,6 +24,11 @@
 
 #include <iomanip>
 
+CYFunctionExpression *CYNonLocalize(CYContext &context, CYFunctionExpression *function) {
+    function->nonlocal_ = context.nextlocal_;
+    return function;
+}
+
 CYExpression *CYAdd::Replace(CYContext &context) {
     CYInfix::Replace(context);
 
@@ -55,13 +60,21 @@ CYExpression *CYAdd::Replace(CYContext &context) {
 }
 
 CYExpression *CYAddressOf::Replace(CYContext &context) {
-    CYPrefix::Replace(context);
     return $C0($M(rhs_, $S("$cya")));
 }
 
-void CYArgument::Replace(CYContext &context) { $T()
+CYArgument *CYArgument::Replace(CYContext &context) { $T(NULL)
     context.Replace(value_);
-    next_->Replace(context);
+    next_ = next_->Replace(context);
+
+    if (value_ == NULL) {
+        if (next_ == NULL)
+            return NULL;
+        else
+            value_ = $U;
+    }
+
+    return this;
 }
 
 CYExpression *CYArray::Replace(CYContext &context) {
@@ -72,7 +85,7 @@ CYExpression *CYArray::Replace(CYContext &context) {
 CYExpression *CYArrayComprehension::Replace(CYContext &context) {
     CYVariable *cyv($V("$cyv"));
 
-    return $C0($F(NULL, $P1("$cyv", comprehensions_->Parameters(context)), $$->*
+    return $C0($F(NULL, $P1($L("$cyv"), comprehensions_->Parameters(context)), $$->*
         $E($ CYAssign(cyv, $ CYArray()))->*
         comprehensions_->Replace(context, $E($C1($M(cyv, $S("push")), expression_)))->*
         $ CYReturn(cyv)
@@ -114,7 +127,7 @@ namespace cy {
 namespace Syntax {
 
 void Catch::Replace(CYContext &context) { $T()
-    CYScope scope(CYScopeCatch, context, code_.statements_);
+    CYScope scope(true, context, code_.statements_);
 
     context.Replace(name_);
     context.scope_->Declare(context, name_, CYIdentifierCatch);
@@ -142,6 +155,15 @@ CYExpression *CYCompound::Replace(CYContext &context) {
     return this;
 }
 
+CYExpression *CYCompound::Primitive(CYContext &context) {
+    CYExpression *expression(expressions_);
+    if (expression == NULL)
+        return NULL;
+    while (expression->next_ != NULL)
+        expression = expression->next_;
+    return expression->Primitive(context);
+}
+
 CYFunctionParameter *CYComprehension::Parameters(CYContext &context) const { $T(NULL)
     CYFunctionParameter *next(next_->Parameters(context));
     if (CYFunctionParameter *parameter = Parameter(context)) {
@@ -170,7 +192,7 @@ void CYContext::NonLocal(CYStatement *&statements) {
         CYIdentifier *unique(nextlocal_->identifier_->Replace(context));
 
         CYStatement *declare(
-            $ CYVar($L1($L(unique, $ CYObject()))));
+            $ CYVar($L1($ CYDeclaration(unique, $ CYObject()))));
 
         cy::Syntax::Catch *rescue(
             $ cy::Syntax::Catch(cye, $$->*
@@ -195,6 +217,10 @@ CYStatement *CYContinue::Replace(CYContext &context) {
     return this;
 }
 
+CYStatement *CYDebugger::Replace(CYContext &context) {
+    return this;
+}
+
 CYAssignment *CYDeclaration::Assignment(CYContext &context) {
     if (initialiser_ == NULL)
         return NULL;
@@ -209,7 +235,7 @@ CYVariable *CYDeclaration::Variable(CYContext &context) {
 }
 
 CYStatement *CYDeclaration::ForEachIn(CYContext &context, CYExpression *value) {
-    return $ CYVar($L1($L(identifier_, value)));
+    return $ CYVar($L1($ CYDeclaration(identifier_, value)));
 }
 
 CYExpression *CYDeclaration::Replace(CYContext &context) {
@@ -224,15 +250,15 @@ void CYDeclarations::Replace(CYContext &context) { $T()
 }
 
 CYProperty *CYDeclarations::Property(CYContext &context) { $T(NULL)
-    return $ CYProperty(declaration_->identifier_, declaration_->initialiser_ ?: $U, next_->Property(context));
+    return $ CYProperty(declaration_->identifier_, declaration_->initialiser_, next_->Property(context));
 }
 
 CYFunctionParameter *CYDeclarations::Parameter(CYContext &context) { $T(NULL)
-    return $ CYFunctionParameter(declaration_->identifier_, next_->Parameter(context));
+    return $ CYFunctionParameter($ CYDeclaration(declaration_->identifier_), next_->Parameter(context));
 }
 
 CYArgument *CYDeclarations::Argument(CYContext &context) { $T(NULL)
-    return $ CYArgument(declaration_->initialiser_ ?: $U, next_->Argument(context));
+    return $ CYArgument(declaration_->initialiser_, next_->Argument(context));
 }
 
 CYCompound *CYDeclarations::Compound(CYContext &context) { $T(NULL)
@@ -243,7 +269,8 @@ CYCompound *CYDeclarations::Compound(CYContext &context) { $T(NULL)
 }
 
 CYExpression *CYDirectMember::Replace(CYContext &context) {
-    Replace_(context);
+    context.Replace(object_);
+    context.Replace(property_);
     return this;
 }
 
@@ -303,6 +330,12 @@ CYString *CYFalse::String(CYContext &context) {
     return $S("false");
 }
 
+CYExpression *CYFatArrow::Replace(CYContext &context) {
+    CYFunctionExpression *function($ CYFunctionExpression(NULL, parameters_, code_));
+    function->this_.SetNext(context.this_);
+    return function;
+}
+
 void CYFinally::Replace(CYContext &context) { $T()
     code_.Replace(context);
 }
@@ -335,17 +368,23 @@ CYStatement *CYForIn::Replace(CYContext &context) {
 }
 
 CYFunctionParameter *CYForInComprehension::Parameter(CYContext &context) const {
-    return $ CYFunctionParameter(name_);
+    return $ CYFunctionParameter($ CYDeclaration(name_));
 }
 
 CYStatement *CYForInComprehension::Replace(CYContext &context, CYStatement *statement) const {
     return $ CYForIn($V(name_), set_, CYComprehension::Replace(context, statement));
 }
 
-CYStatement *CYForEachIn::Replace(CYContext &context) {
+CYStatement *CYForOf::Replace(CYContext &context) {
+    if (CYAssignment *assignment = initialiser_->Assignment(context))
+        return $ CYBlock($$->*
+            $E(assignment)->*
+            this
+        );
+
     CYIdentifier *cys($I("$cys")), *cyt($I("$cyt"));
 
-    return $ CYLet($L2($L(cys, set_), $L(cyt)), $$->*
+    return $ CYLetStatement($L2($ CYDeclaration(cys, set_), $ CYDeclaration(cyt)), $$->*
         $ CYForIn($V(cyt), $V(cys), $ CYBlock($$->*
             initialiser_->ForEachIn(context, $M($V(cys), $V(cyt)))->*
             code_
@@ -353,14 +392,14 @@ CYStatement *CYForEachIn::Replace(CYContext &context) {
     );
 }
 
-CYFunctionParameter *CYForEachInComprehension::Parameter(CYContext &context) const {
-    return $ CYFunctionParameter(name_);
+CYFunctionParameter *CYForOfComprehension::Parameter(CYContext &context) const {
+    return $ CYFunctionParameter($ CYDeclaration(name_));
 }
 
-CYStatement *CYForEachInComprehension::Replace(CYContext &context, CYStatement *statement) const {
+CYStatement *CYForOfComprehension::Replace(CYContext &context, CYStatement *statement) const {
     CYIdentifier *cys($I("cys"));
 
-    return $E($C0($F(NULL, $P1("$cys"), $$->*
+    return $E($C0($F(NULL, $P1($L("$cys")), $$->*
         $E($ CYAssign($V(cys), set_))->*
         $ CYForIn($V(name_), $V(cys), $ CYBlock($$->*
             $E($ CYAssign($V(name_), $M($V(cys), $V(name_))))->*
@@ -378,7 +417,8 @@ void CYFunction::Replace_(CYContext &context, bool outer) {
     if (outer)
         Inject(context);
 
-    CYScope scope(CYScopeFunction, context, code_.statements_);
+    CYThisScope *_this(context.this_);
+    context.this_ = CYGetLast(&this_);
 
     CYNonLocal *nonlocal(context.nonlocal_);
     CYNonLocal *nextlocal(context.nextlocal_);
@@ -393,20 +433,27 @@ void CYFunction::Replace_(CYContext &context, bool outer) {
         context.nextlocal_ = nonlocal_;
     }
 
+    CYScope scope(!localize, context, code_.statements_);
+
     if (!outer && name_ != NULL)
         Inject(context);
 
-    if (parameters_ != NULL)
-        parameters_ = parameters_->Replace(context, code_);
-
+    parameters_->Replace(context, code_);
     code_.Replace(context);
 
+    if (CYIdentifier *identifier = this_.identifier_)
+        code_.statements_ = $$->*
+            $ CYVar($L1($ CYDeclaration(identifier, $ CYThis())))->*
+            code_.statements_;
+
     if (localize)
         context.NonLocal(code_.statements_);
 
     context.nextlocal_ = nextlocal;
     context.nonlocal_ = nonlocal;
 
+    context.this_ = _this;
+
     scope.Close();
 }
 
@@ -415,12 +462,17 @@ CYExpression *CYFunctionExpression::Replace(CYContext &context) {
     return this;
 }
 
-CYFunctionParameter *CYFunctionParameter::Replace(CYContext &context, CYBlock &code) {
-    context.Replace(name_);
-    context.scope_->Declare(context, name_, CYIdentifierArgument);
-    if (next_ != NULL)
-        next_ = next_->Replace(context, code);
-    return this;
+void CYFunctionParameter::Replace(CYContext &context, CYBlock &code) { $T()
+    CYAssignment *assignment(initialiser_->Assignment(context));
+    context.Replace(initialiser_);
+
+    next_->Replace(context, code);
+
+    if (assignment != NULL)
+        // XXX: this cast is quite incorrect
+        code.AddPrev($ CYIf($ CYIdentical($ CYTypeOf(dynamic_cast<CYExpression *>(initialiser_)), $S("undefined")), $$->*
+            $E(assignment)
+        ));
 }
 
 CYStatement *CYFunctionStatement::Replace(CYContext &context) {
@@ -451,12 +503,10 @@ CYStatement *CYIfComprehension::Replace(CYContext &context, CYStatement *stateme
 }
 
 CYExpression *CYIndirect::Replace(CYContext &context) {
-    CYPrefix::Replace(context);
     return $M(rhs_, $S("$cyi"));
 }
 
 CYExpression *CYIndirectMember::Replace(CYContext &context) {
-    Replace_(context);
     return $M($ CYIndirect(object_), property_);
 }
 
@@ -471,20 +521,15 @@ CYStatement *CYLabel::Replace(CYContext &context) {
     return this;
 }
 
-CYStatement *CYLet::Replace(CYContext &context) {
-    return $E($ CYCall($ CYFunctionExpression(NULL, declarations_->Parameter(context), code_), declarations_->Argument(context)));
-}
-
-void CYMember::Replace_(CYContext &context) {
-    context.Replace(object_);
-    context.Replace(property_);
+CYStatement *CYLetStatement::Replace(CYContext &context) {
+    return $E($ CYCall(CYNonLocalize(context, $ CYFunctionExpression(NULL, declarations_->Parameter(context), code_)), declarations_->Argument(context)));
 }
 
 namespace cy {
 namespace Syntax {
 
 CYExpression *New::AddArgument(CYContext &context, CYExpression *value) {
-    CYSetLast(arguments_, $ CYArgument(value));
+    CYSetLast(arguments_) = $ CYArgument(value);
     return this;
 }
 
@@ -518,19 +563,6 @@ CYExpression *CYObject::Replace(CYContext &context) {
     return this;
 }
 
-CYFunctionParameter *CYOptionalFunctionParameter::Replace(CYContext &context, CYBlock &code) {
-    CYFunctionParameter *parameter($ CYFunctionParameter(name_, next_));
-    parameter = parameter->Replace(context, code);
-    context.Replace(initializer_);
-
-    CYVariable *name($V(name_));
-    code.AddPrev($ CYIf($ CYIdentical($ CYTypeOf(name), $S("undefined")), $$->*
-        $E($ CYAssign(name, initializer_))
-    ));
-
-    return parameter;
-}
-
 CYExpression *CYPostfix::Replace(CYContext &context) {
     context.Replace(lhs_);
     return this;
@@ -560,7 +592,7 @@ namespace {
 }
 
 void CYProgram::Replace(CYContext &context) {
-    CYScope scope(CYScopeProgram, context, statements_);
+    CYScope scope(true, context, statements_);
 
     context.nextlocal_ = $ CYNonLocal();
     context.ReplaceAll(statements_);
@@ -618,6 +650,8 @@ void CYProgram::Replace(CYContext &context) {
 void CYProperty::Replace(CYContext &context) { $T()
     context.Replace(value_);
     next_->Replace(context);
+    if (value_ == NULL)
+        value_ = $U;
 }
 
 CYStatement *CYReturn::Replace(CYContext &context) {
@@ -638,13 +672,11 @@ CYExpression *CYRubyBlock::Replace(CYContext &context) {
 }
 
 CYExpression *CYRubyProc::Replace(CYContext &context) {
-    CYFunctionExpression *function($ CYFunctionExpression(NULL, parameters_, code_));
-    function->nonlocal_ = context.nextlocal_;
-    return function;
+    return CYNonLocalize(context, $ CYFunctionExpression(NULL, parameters_, code_));
 }
 
-CYScope::CYScope(CYScopeType type, CYContext &context, CYStatement *&statements) :
-    type_(type),
+CYScope::CYScope(bool transparent, CYContext &context, CYStatement *&statements) :
+    transparent_(transparent),
     context_(context),
     statements_(statements),
     parent_(context.scope_)
@@ -661,10 +693,10 @@ void CYScope::Close() {
 }
 
 void CYScope::Declare(CYContext &context, CYIdentifier *identifier, CYIdentifierFlags flags) {
-    if (type_ == CYScopeCatch && flags != CYIdentifierCatch)
-        parent_->Declare(context, identifier, flags);
-    else
+    if (!transparent_ || flags == CYIdentifierArgument || flags == CYIdentifierCatch)
         internal_.insert(CYIdentifierAddressFlagsMap::value_type(identifier, flags));
+    else if (parent_ != NULL)
+        parent_->Declare(context, identifier, flags);
 }
 
 CYIdentifier *CYScope::Lookup(CYContext &context, CYIdentifier *identifier) {
@@ -790,6 +822,8 @@ CYStatement *CYSwitch::Replace(CYContext &context) {
 }
 
 CYExpression *CYThis::Replace(CYContext &context) {
+    if (context.this_ != NULL)
+        return $V(context.this_->Identifier(context));
     return this;
 }