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| author | marha <marha@users.sourceforge.net> | 2010-09-01 15:05:15 +0000 |
|---|---|---|
| committer | marha <marha@users.sourceforge.net> | 2010-09-01 15:05:15 +0000 |
| commit | a1c59d04b8d5ce972c34bd1e5abd941b55655029 (patch) | |
| tree | bb62b1ec94277a10de7bc22bba9ac62e74878b5d /tools/mhmake/src/mhmakefileparser.cpp | |
| parent | e09e8cbeb878fc881b6987280e18ce5430318451 (diff) | |
| download | vcxsrv-a1c59d04b8d5ce972c34bd1e5abd941b55655029.tar.gz vcxsrv-a1c59d04b8d5ce972c34bd1e5abd941b55655029.tar.bz2 vcxsrv-a1c59d04b8d5ce972c34bd1e5abd941b55655029.zip | |
Make it possible to use more complicated expressions in if statements
Diffstat (limited to 'tools/mhmake/src/mhmakefileparser.cpp')
| -rw-r--r-- | tools/mhmake/src/mhmakefileparser.cpp | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/tools/mhmake/src/mhmakefileparser.cpp b/tools/mhmake/src/mhmakefileparser.cpp index 35d379cd0..e87f46887 100644 --- a/tools/mhmake/src/mhmakefileparser.cpp +++ b/tools/mhmake/src/mhmakefileparser.cpp @@ -100,6 +100,10 @@ static inline size_t SkipMakeExpr(const string &Expr,size_t i) {
i=SkipMakeExpr(Expr,i);
}
+#ifdef _DEBUG
+ if (i>=Expr.length())
+ throw(string(") not found in ")+Expr);
+#endif
Char=Expr[i++];
}
return i;
@@ -1181,3 +1185,135 @@ void mhmakefileparser::CreateUSED_ENVVARS() m_Variables[USED_ENVVARS]=Val;
}
+static string s_TrueString("1");
+static string s_FalseString("0");
+
+static string AndExpression(const string &First, const string &Second)
+{
+ if (First.empty() || First==s_FalseString)
+ {
+ return g_EmptyString;
+ }
+ else
+ {
+ return Second.empty() || Second==s_FalseString ? g_EmptyString : s_TrueString;
+ }
+}
+
+static string OrExpression(const string &First, const string &Second)
+{
+ if (First.empty() || First==s_FalseString)
+ {
+ return Second.empty() || Second==s_FalseString ? g_EmptyString : s_TrueString;
+ }
+ else
+ {
+ return s_TrueString;
+ }
+}
+
+string mhmakefileparser::ResolveExpression(const string &InExpr,string &Rest) const
+{
+ unsigned i=0;
+ string Ret;
+ string Expr=InExpr;
+
+ Rest=g_EmptyString;
+
+ while (i<Expr.length())
+ {
+ while (strchr(" \t\r",Expr[i])) i++;
+ switch (Expr[i])
+ {
+ case '!':
+ if (Expr[i+1]!='=')
+ {
+ Ret=ResolveExpression(Expr.substr(i+1),Expr);
+ Ret = Ret.empty() || Ret==s_FalseString ? s_TrueString : g_EmptyString;
+ i=0;
+ }
+ else
+ {
+ Ret = Ret!=ResolveExpression(Expr.substr(i+2),Expr) ? s_TrueString : g_EmptyString;
+ i=0;
+ }
+ break;
+ case '&':
+ if (Expr[i+1]!='&')
+ {
+ Ret+=Expr[i++];
+ }
+ else
+ {
+ Ret=AndExpression(Ret,ResolveExpression(Expr.substr(i+2),Expr));
+ i=0;
+ }
+ break;
+ case '|':
+ if (Expr[i+1]!='|')
+ {
+ Ret+=Expr[i++];
+ }
+ else
+ {
+ Ret=OrExpression(Ret,ResolveExpression(Expr.substr(i+2),Expr));
+ i=0;
+ }
+ break;
+ case '(':
+ if (Ret=="defined")
+ {
+ Ret=IsDefined(ResolveExpression(Expr.substr(i+1),Expr)) ? s_TrueString : g_EmptyString;
+ }
+ else
+ {
+ Ret+=ResolveExpression(Expr.substr(i+1),Expr);
+ }
+ i=0;
+ break;
+ case ')':
+ Rest=Expr.substr(i+1);
+ return Ret;
+ break;
+ case '"':
+ {
+ i++;
+ while (i<Expr.length())
+ {
+ char Char=Expr[i++];
+ if (Char=='"')
+ break;
+ Ret+=Char;
+ }
+ }
+ break;
+ case '=':
+ if (Expr[i+1]!='=')
+ {
+ Ret+=Expr[i++];
+ }
+ else
+ {
+ Ret = Ret==ResolveExpression(Expr.substr(i+2),Expr) ? s_TrueString : g_EmptyString;
+ i=0;
+ }
+ break;
+ default:
+ Ret+=Expr[i++];
+ break;
+ }
+ }
+ return Ret;
+}
+///////////////////////////////////////////////////////////////////////////////
+bool mhmakefileparser::IsExprTrue(const string &EqualExpr) const
+{
+ string Expr=ExpandExpression(EqualExpr);
+ string Rest;
+ Expr=ResolveExpression(Expr,Rest);
+ if (Expr.empty() || Expr==s_FalseString)
+ return false;
+ else
+ return true;
+}
+
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