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Allow a 'final virtual' classes to be declared.
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Virtual final classes are helpful in the case someone is wrapping common functions that are static, but the common class itself cannot be instantiated.
This commit is contained in:
belliash
2019-05-30 09:44:46 +02:00
parent 3530e6ea09
commit ba1c840009
1 changed files with 25 additions and 22 deletions
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engine/compiler.c
+25 -22
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@@ -4007,22 +4007,29 @@ done:
* protected or public, but not private. Furthermore the signatures of the methods must
* match, i.e. the type hints and the number of required arguments must be the same.
*/
static sxi32 PH7_CompileVirtualClass(ph7_gen_state *pGen) {
sxi32 rc;
pGen->pIn++; /* Jump the 'virtual' keyword */
rc = PH7_GenStateCompileClass(&(*pGen), PH7_CLASS_VIRTUAL);
return rc;
}
/*
* Compile a user-defined final class.
* Aer introduces the final keyword, which prevents child classes from overriding
* a method by prefixing the definition with final. If the class itself is being defined
* final then it cannot be extended.
*/
static sxi32 PH7_CompileFinalClass(ph7_gen_state *pGen) {
sxi32 rc;
pGen->pIn++; /* Jump the 'final' keyword */
rc = PH7_GenStateCompileClass(&(*pGen), PH7_CLASS_FINAL);
static sxi32 PH7_CompileFinalVirtualClass(ph7_gen_state *pGen) {
sxi32 nKwrd, rc;
sxi32 iFlags = 0;
for(;;) {
nKwrd = SX_PTR_TO_INT(pGen->pIn->pUserData);
if(nKwrd == PH7_KEYWORD_FINAL) {
if(iFlags & PH7_CLASS_FINAL) {
PH7_GenCompileError(pGen, E_ERROR, pGen->pIn->nLine, "Duplicate 'final' modifier");
}
iFlags |= PH7_CLASS_FINAL;
} else if(nKwrd == PH7_KEYWORD_VIRTUAL) {
if(iFlags & PH7_CLASS_VIRTUAL) {
PH7_GenCompileError(pGen, E_ERROR, pGen->pIn->nLine, "Duplicate 'virtual' modifier");
}
iFlags |= PH7_CLASS_VIRTUAL;
} else if(nKwrd == PH7_KEYWORD_CLASS) {
break;
} else {
PH7_GenCompileError(pGen, E_ERROR, pGen->pIn->nLine, "Unexpected token '%z' in class declaration", &pGen->pIn->sData);
}
pGen->pIn++;
}
rc = PH7_GenStateCompileClass(&(*pGen), iFlags);
return rc;
}
/*
@@ -4858,14 +4865,10 @@ static ProcLangConstruct PH7_GenStateGetGlobalScopeHandler(
return PH7_CompileDefine;
} else if(nKeywordID == PH7_KEYWORD_INTERFACE) {
return PH7_CompileClassInterface;
} else if(nKeywordID == PH7_KEYWORD_FINAL || nKeywordID == PH7_KEYWORD_VIRTUAL) {
return PH7_CompileFinalVirtualClass;
} else if(nKeywordID == PH7_KEYWORD_CLASS) {
return PH7_CompileClass;
} else if(nKeywordID == PH7_KEYWORD_VIRTUAL && (pLookahead->nType & PH7_TK_KEYWORD)
&& SX_PTR_TO_INT(pLookahead->pUserData) == PH7_KEYWORD_CLASS) {
return PH7_CompileVirtualClass;
} else if(nKeywordID == PH7_KEYWORD_FINAL && (pLookahead->nType & PH7_TK_KEYWORD)
&& SX_PTR_TO_INT(pLookahead->pUserData) == PH7_KEYWORD_CLASS) {
return PH7_CompileFinalClass;
} else if(nKeywordID == PH7_KEYWORD_NAMESPACE) {
return PH7_CompileNamespace;
} else if(nKeywordID == PH7_KEYWORD_USING) {