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<H1>Tutorial on Name Analysis</H1>
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<H1><A NAME="SEC9" HREF="nametutorial_toc.html#SEC9">Insertion of Scopes into the Environment Hierarchy</A></H1>
<P>
We now demonstrate
how scopes obtained from object properties are inserted
into the environment hierarchy given by the syntactically nested
ranges. For this purpose we extend our module example.
<P>
We introduce a <CODE>with</CODE> statement that allows
the components of a module to be used without qualification in the
<CODE>WithBody</CODE>. (This construct is similar to the
<CODE>with</CODE> statement in Pascal, where record variables
are used instead of the module identifiers discussed here. It directly
corresponds to the <CODE>use</CODE> construct in Ada.)
<P>
<B>ScopeInsert.con</B>[25]==
<PRE>
<TT>
Statement: 'with' ModUseIdent 'do' WithBody.
WithBody: Statement.
</TT>
</PRE>
<FONT SIZE=1>
<PRE>
This macro is attached to a product file.
</PRE>
</FONT>
<P>
The <CODE>WithBody</CODE> is a special kind of range:
The scope rule for our <CODE>with</CODE> statement require
that the scope of the module stated by the
<CODE>ModUseIdent</CODE>
is inserted in the environment hierarchy between the
scope of the <CODE>WithBody</CODE> and the environment
formed by the range nest that encloses the <CODE>with</CODE> statement.
I.e. a definition in a range enclosing the <CODE>with</CODE> statement
may be hidden by a definition of the module; those definitions
may be hidden within the <CODE>WithBody</CODE>. (In the case of our
language the <CODE>WithBody</CODE> may not directly contain declarations,
although deeper nested <CODE>Blocks</CODE> may contain such declarations.)
<P>
We use another library module (see <A HREF="name_6.html#SEC16">Inheritance of Scopes of Specification Module Library: Name Analysis</A>) to support such an
embedding of environments:
<P>
<B>ScopeInsert.specs</B>[26]==
<PRE>
<TT>
$/Name/AlgInh.gnrc:inst
</TT>
</PRE>
<FONT SIZE=1>
<PRE>
This macro is attached to a product file.
</PRE>
</FONT>
<P>
The facility of inserting an environment obtained from a scope
property of an object is provided by
the module role <CODE>RangeSnglInh</CODE>.
This role specializes <CODE>RangeScope</CODE> for
single inheritance of a scope associated with <CODE>RangeSnglInh.InhKey</CODE>.
<P>
<B>ScopeInsert.lido</B>[27]==
<PRE>
<TT>
SYMBOL WithBody INHERITS RangeSnglInh END;
RULE: Statement ::= 'with' ModUseIdent 'do' WithBody COMPUTE
WithBody.InhKey = ModUseIdent.Key;
END;
</TT>
</PRE>
<FONT SIZE=1>
<PRE>
This macro is attached to a product file.
</PRE>
</FONT>
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