X-Git-Url: https://git.saurik.com/cycript.git/blobdiff_plain/029bc65b46de676c6733fff684000c7363eda512..c30687a7155e8c96310eaddd8213f6d3a69cab0e:/Replace.cpp

diff --git a/Replace.cpp b/Replace.cpp
index fc02461..c06c2a5 100644
--- a/Replace.cpp
+++ b/Replace.cpp
@@ -38,12 +38,10 @@
 /* }}} */
 
 #include "Parser.hpp"
-#include "Context.hpp"
+#include "Replace.hpp"
 
 #include <iomanip>
 
-#include "Replace.hpp"
-
 CYExpression *CYAdd::Replace(CYContext &context) {
     CYInfix::Replace(context);
 
@@ -180,9 +178,9 @@ CYExpression *CYDeclaration::ForEachIn(CYContext &context) {
 }
 
 CYExpression *CYDeclaration::Replace(CYContext &context) {
-    CYIdentifier *identifier(identifier_->Replace(context));
-    context.scope_->internal_.insert(CYIdentifierAddressFlagsMap::value_type(identifier, CYIdentifierVariable));
-    return $ CYVariable(identifier);
+    context.Replace(identifier_);
+    context.scope_->Declare(context, identifier_, CYIdentifierVariable);
+    return $ CYVariable(identifier_);
 }
 
 CYProperty *CYDeclarations::Property(CYContext &context) { $T(NULL)
@@ -331,44 +329,50 @@ CYStatement *CYForEachInComprehension::Replace(CYContext &context, CYStatement *
     )));
 }
 
-void CYFunction::Replace_(CYContext &context) {
-    parent_ = context.scope_;
-    context.scope_ = this;
+void CYFunction::Inject(CYContext &context) {
+    context.Replace(name_);
+    context.scope_->Declare(context, name_, CYIdentifierOther);
+}
+
+void CYFunction::Replace_(CYContext &context, bool outer) {
+    if (outer)
+        Inject(context);
+
+    CYScope scope;
+    scope.parent_ = context.scope_;
+    context.scope_ = &scope;
+
+    if (!outer && name_ != NULL)
+        Inject(context);
 
     parameters_->Replace(context);
     code_.Replace(context);
 
-    context.scope_ = parent_;
-    Scope(context, code_.statements_);
+    context.scope_ = scope.parent_;
+    scope.Scope(context, code_.statements_);
 }
 
 CYExpression *CYFunctionExpression::Replace(CYContext &context) {
-    Replace_(context);
+    Replace_(context, false);
     return this;
 }
 
 void CYFunctionParameter::Replace(CYContext &context) { $T()
     name_ = name_->Replace(context);
-    context.scope_->internal_.insert(CYIdentifierAddressFlagsMap::value_type(name_, CYIdentifierArgument));
+    context.scope_->Declare(context, name_, CYIdentifierArgument);
     next_->Replace(context);
 }
 
 CYStatement *CYFunctionStatement::Replace(CYContext &context) {
-    Replace_(context);
+    Replace_(context, true);
     return this;
 }
 
 CYIdentifier *CYIdentifier::Replace(CYContext &context) {
-    if (replace_ != NULL)
-        return replace_;
-
-    CYIdentifierValueSet &identifiers(context.scope_->identifiers_);
-    std::pair<CYIdentifierValueSet::iterator, bool> insert(identifiers.insert(this));
-    if (!insert.second)
-        return *insert.first;
-
-    replace_ = this;
-    return this;
+    if (replace_ != NULL && replace_ != this)
+        return replace_->Replace(context);
+    replace_ = context.scope_->Lookup(context, this);
+    return replace_;
 }
 
 CYStatement *CYIf::Replace(CYContext &context) {
@@ -454,12 +458,77 @@ CYExpression *CYPrefix::Replace(CYContext &context) {
     return this;
 }
 
+// XXX: this is evil evil black magic. don't ask, don't tell... don't believe!
+#define MappingSet "0etnirsoalfucdphmgyvbxTwSNECAFjDLkMOIBPqzRH$_WXUVGYKQJZ"
+//#define MappingSet "0abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ$_"
+
+namespace {
+    struct IdentifierUsageLess :
+        std::binary_function<CYIdentifier *, CYIdentifier *, bool>
+    {
+        _finline bool operator ()(CYIdentifier *lhs, CYIdentifier *rhs) const {
+            if (lhs->usage_ != rhs->usage_)
+                return lhs->usage_ > rhs->usage_;
+            return lhs < rhs;
+        }
+    };
+
+    typedef std::set<CYIdentifier *, IdentifierUsageLess> IdentifierUsages;
+}
+
 void CYProgram::Replace(CYContext &context) {
-    parent_ = context.scope_;
-    context.scope_ = this;
+    CYScope scope;
+    scope.parent_ = context.scope_;
+    context.scope_ = &scope;
     statements_ = statements_->ReplaceAll(context);
-    context.scope_ = parent_;
-    Scope(context, statements_);
+    context.scope_ = scope.parent_;
+    scope.Scope(context, statements_);
+
+    size_t offset(0);
+
+    CYCStringSet external;
+    for (CYIdentifierValueSet::const_iterator i(scope.identifiers_.begin()); i != scope.identifiers_.end(); ++i)
+        external.insert((*i)->Word());
+
+    IdentifierUsages usages;
+
+    if (offset < context.rename_.size())
+        for (CYIdentifier *i(context.rename_[offset].identifier_); i != NULL; i = i->next_)
+             usages.insert(i);
+
+    // XXX: totalling the probable occurrences and sorting by them would improve the result
+    for (CYIdentifierUsageVector::const_iterator i(context.rename_.begin()); i != context.rename_.end(); ++i, ++offset) {
+        //std::cout << *i << ":" << (*i)->offset_ << std::endl;
+
+        const char *name;
+
+        if (context.options_.verbose_)
+            name = apr_psprintf(context.pool_, "$%"APR_SIZE_T_FMT"", offset);
+        else {
+            char id[8];
+            id[7] = '\0';
+
+          id:
+            unsigned position(7), local(offset + 1);
+
+            do {
+                unsigned index(local % (sizeof(MappingSet) - 1));
+                local /= sizeof(MappingSet) - 1;
+                id[--position] = MappingSet[index];
+            } while (local != 0);
+
+            if (external.find(id + position) != external.end()) {
+                ++offset;
+                goto id;
+            }
+
+            name = apr_pstrmemdup(context.pool_, id + position, 7 - position);
+            // XXX: at some point, this could become a keyword
+        }
+
+        for (CYIdentifier *identifier(i->identifier_); identifier != NULL; identifier = identifier->next_)
+            identifier->Set(name);
+    }
 }
 
 void CYProperty::Replace(CYContext &context) { $T()
@@ -472,36 +541,75 @@ CYStatement *CYReturn::Replace(CYContext &context) {
     return this;
 }
 
-void CYScope::Add(CYContext &context, CYIdentifierAddressSet &external) {
-    for (CYIdentifierAddressSet::const_iterator i(external.begin()); i != external.end(); ++i) {
-        std::pair<CYIdentifierAddressSet::iterator, bool> insert(identifiers_.insert(*i));
-        if (!insert.second)
-            (*i)->replace_ = *insert.first;
+void CYScope::Declare(CYContext &context, CYIdentifier *identifier, CYIdentifierFlags flags) {
+    internal_.insert(CYIdentifierAddressFlagsMap::value_type(identifier, flags));
+}
+
+CYIdentifier *CYScope::Lookup(CYContext &context, CYIdentifier *identifier) {
+    std::pair<CYIdentifierValueSet::iterator, bool> insert(identifiers_.insert(identifier));
+    return *insert.first;
+}
+
+void CYScope::Merge(CYContext &context, CYIdentifier *identifier) {
+    std::pair<CYIdentifierValueSet::iterator, bool> insert(identifiers_.insert(identifier));
+    if (!insert.second) {
+        if ((*insert.first)->offset_ < identifier->offset_)
+            (*insert.first)->offset_ = identifier->offset_;
+        identifier->replace_ = *insert.first;
+        (*insert.first)->usage_ += identifier->usage_ + 1;
     }
 }
 
-void CYScope::Scope(CYContext &context, CYStatement *&statements) {
-    CYIdentifierAddressSet external;
+namespace {
+    struct IdentifierOffset {
+        size_t offset_;
+        CYIdentifierFlags flags_;
+        size_t usage_;
+        CYIdentifier *identifier_;
 
-    if (context.options_.verbose_)
-        std::cout << this << ':';
+        IdentifierOffset(CYIdentifier *identifier, CYIdentifierFlags flags) :
+            offset_(identifier->offset_),
+            flags_(flags),
+            usage_(identifier->usage_),
+            identifier_(identifier)
+        {
+        }
+    };
+
+    struct IdentifierOffsetLess :
+        std::binary_function<const IdentifierOffset &, const IdentifierOffset &, bool>
+    {
+        _finline bool operator ()(const IdentifierOffset &lhs, const IdentifierOffset &rhs) const {
+            if (lhs.offset_ != rhs.offset_)
+                return lhs.offset_ < rhs.offset_;
+            if (lhs.flags_ != rhs.flags_)
+                return lhs.flags_ < rhs.flags_;
+            /*if (lhs.usage_ != rhs.usage_)
+                return lhs.usage_ < rhs.usage_;*/
+            return lhs.identifier_ < rhs.identifier_;
+        }
+    };
+
+    typedef std::set<IdentifierOffset, IdentifierOffsetLess> IdentifierOffsets;
+}
+
+void CYScope::Scope(CYContext &context, CYStatement *&statements) {
+    if (parent_ == NULL)
+        return;
 
     CYDeclarations *last(NULL), *curr(NULL);
 
-    for (CYIdentifierValueSet::const_iterator i(identifiers_.begin()); i != identifiers_.end(); ++i)
-        if (internal_.find(*i) == internal_.end()) {
-            if (context.options_.verbose_)
-                std::cout << ' ' << (*i)->Word() << '@' << static_cast<const CYWord *>(*i);
-            external.insert(*i);
-        } else {
-            if (context.options_.verbose_) {
-                std::cout << ' ' << offset_ << ':' << (*i)->Word() << '@' << static_cast<const CYWord *>(*i);
-                (*i)->Set(apr_psprintf(context.pool_, "$%u", offset_++));
-            } else {
-                (*i)->Set(apr_psprintf(context.pool_, "$%u", offset_++));
-            }
+    IdentifierOffsets offsets;
+
+    for (CYIdentifierAddressFlagsMap::const_iterator i(internal_.begin()); i != internal_.end(); ++i)
+        if (i->second != CYIdentifierMagic)
+            offsets.insert(IdentifierOffset(i->first, i->second));
+
+    size_t offset(0);
 
-            CYDeclarations *next($ CYDeclarations($ CYDeclaration(*i)));
+    for (IdentifierOffsets::const_iterator i(offsets.begin()); i != offsets.end(); ++i) {
+        if (i->flags_ == CYIdentifierVariable) {
+            CYDeclarations *next($ CYDeclarations($ CYDeclaration(i->identifier_)));
             if (last == NULL)
                 last = next;
             if (curr != NULL)
@@ -509,8 +617,16 @@ void CYScope::Scope(CYContext &context, CYStatement *&statements) {
             curr = next;
         }
 
-    if (context.options_.verbose_)
-        std::cout << " ->" << parent_ << std::endl;
+        if (offset < i->offset_)
+            offset = i->offset_;
+        if (context.rename_.size() <= offset)
+            context.rename_.resize(offset + 1);
+
+        CYIdentifierUsage &rename(context.rename_[offset++]);
+        i->identifier_->SetNext(rename.identifier_);
+        rename.identifier_ = i->identifier_;
+        rename.usage_ += i->identifier_->usage_ + 1;
+    }
 
     if (last != NULL) {
         CYVar *var($ CYVar(last));
@@ -518,11 +634,13 @@ void CYScope::Scope(CYContext &context, CYStatement *&statements) {
         statements = var;
     }
 
-    if (parent_ != NULL) {
-        if (parent_->offset_ < offset_)
-            parent_->offset_ = offset_;
-        parent_->Add(context, external);
-    }
+    for (CYIdentifierValueSet::const_iterator i(identifiers_.begin()); i != identifiers_.end(); ++i)
+        if (internal_.find(*i) == internal_.end()) {
+            //std::cout << *i << '=' << offset << std::endl;
+            if ((*i)->offset_ < offset)
+                (*i)->offset_ = offset;
+            parent_->Merge(context, *i);
+        }
 }
 
 CYStatement *CYStatement::Collapse(CYContext &context) {