X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/d699f48ba33c96c24f7ab3764ad98ded0633c1c5..cb69afe081994cc75654d5813981172fa194f86f:/contrib/src/applet/prepifelse.cpp

diff --git a/contrib/src/applet/prepifelse.cpp b/contrib/src/applet/prepifelse.cpp
index cc209ce795..7cda90bc5f 100644
--- a/contrib/src/applet/prepifelse.cpp
+++ b/contrib/src/applet/prepifelse.cpp
@@ -49,12 +49,17 @@ do not correctly pass the given return value.
 ****************************************************************************/
 int ReverseFind(
     const wxString &tstr,
-    const wxString &str)
+    const wxString &str,
+    int start = -1)
 {
     wxASSERT( str.GetStringData()->IsValid() );
 
     // TODO could be made much quicker than that
     int p = tstr.Len()-str.Len()-1;
+    int p2 = start-str.Len();
+
+    // if the user supplied a valid start point, use it
+    if (start != -1 && p > p2) p = p2;
     while ( p >= 0 ) {
         if ( wxStrncmp(tstr.c_str() + p, str.c_str(), str.Len()) == 0 )
             return p;
@@ -64,6 +69,131 @@ int ReverseFind(
     return -1;
 }
 
+/****************************************************************************
+PARAMETERS:
+str        - text of #if statement
+
+RETURNS:
+true or false depending on how it evaluated
+
+REMARKS:
+
+SEE ALSO:
+wxIfElseVariable
+****************************************************************************/
+bool ParseIfStatementValue(wxString &str) {
+
+    // Find out if the tag has parenthesis
+    // recursive to parse the text within the parenthesis,
+    // replacing the text with 1 or 0, (hardcoded true or false)
+    int b;
+    while ((b = str.Find('(')) != -1) {
+        int e;
+        // Find the matching parenthesis
+        int nextbeg, nextend;
+        int parencount = 1, min = b+1;
+        do {
+
+            nextbeg = str.find('(', min);
+            nextend = str.find(')', min);
+            if (nextbeg < nextend && nextbeg != wxString::npos) {
+                parencount++;
+                min = nextbeg+1;
+                }
+            else {
+                parencount--;
+                min = nextend+1;
+                }
+
+            if (nextend == wxString::npos) {
+                #ifdef CHECKED		
+                wxMessageBox("wxHTML #if\\else error: Unmatched parenthesis in #if expression.","Error",wxICON_ERROR);
+                #endif
+                return true;
+                }
+            // once parencount reaches 0 again we have found our matchin )
+            } while (parencount > 0);
+
+        e = nextend;
+
+        // Extract the expression from the parenthesis block and recurse
+        // to solve it.
+        wxString tag;
+        tag = str.Mid(b+1, e-b-1);
+        bool val = ParseIfStatementValue(tag);
+        // Add extra spaces just in case of NOT(VAL)
+        if (val) str = str.Mid(0, b) + " 1" + str.Mid(e+1);
+        else str = str.Mid(0, b) + " 0" + str.Mid(e+1);
+
+        }
+
+    // Remove spaces from left and right
+    str.Trim(false);
+    str.Trim(true);
+
+    // Convert text method of operators "AND" and "OR" to c style
+    // this makes only one special case necessary for each later on
+    str.Replace(" AND ", "&&");
+    str.Replace(" OR ", "||");
+
+    // We use ReverseFind so that the whole left expression gets evaluated agains
+    // the right single item, creating a left -> right evaluation
+    // Search for || operators, recurse to solve (so we don't have to handle special cases here)
+    int and, or;
+    and = ReverseFind(str, "&&");
+    or = ReverseFind(str, "||");
+    if ( (and != -1) || (or != -1) ) {
+        wxString tag1, tag2;
+        // handle the rightmost first to force left->right evaluation
+        if (and > or) {
+            return (
+                ParseIfStatementValue(tag2 = str.Mid(and+2)) &&
+                ParseIfStatementValue(tag1 = str.Mid(0, and)) );
+            }
+        else {
+            return (
+                ParseIfStatementValue(tag2 = str.Mid(or+2)) ||
+                ParseIfStatementValue(tag1 = str.Mid(0, or)) );
+            }
+
+        }
+
+    // By the time we get to this place in the function we are guarenteed to have a single
+    // variable operation, perhaps with a NOT or ! operator
+    bool notval = false;
+
+    // search for a NOT or ! operator
+    if (str.Mid(0, 1) == "!") {
+        str.Remove(0, 1);
+        str.Trim(false); // trim spaces from left
+        notval = true;
+        }
+    else if (str.Mid(0,4).CmpNoCase("NOT ") == 0) {
+        str.Remove(0, 4);
+        str.Trim(false); // trim any extra spaces from left
+        notval = true;
+        }
+
+    // now all we have left is the name of the class or a hardcoded 0 or 1
+
+    if (str == "") {
+        #ifdef CHECKED		
+        wxMessageBox("wxHTML #if\\else error: Empty expression in #if\\#elif statement.","Error",wxICON_ERROR);
+        #endif
+        return true;
+        }
+
+    // check for hardcoded 0 and 1 cases, (these are used by parenthesis catcher)
+    // this just decomplicates the recursion algorithm
+    if (str == "0") return notval;
+    if (str == "1") return !notval;
+
+    // Grab the value from the variable class identified by cname
+    bool value = wxIfElseVariable::FindValue(str);
+    if (notval) value = !value;
+    return value;
+
+}
 /****************************************************************************
 PARAMETERS:
 text        - HTML to process for if/else blocks
@@ -72,7 +202,7 @@ RETURNS:
 The string containing the processed HTML
 
 REMARKS:
-This function replaces #if, #else, and #endif directives with the text
+This function replaces #if, #else, #elif, and #endif directives with the text
 contained within the blocks, dependant on the value of the given boolean
 variable. The variable is created by making a sub class of wxIfElseVariable.
 Dynamic class construction is used at run time internally to create an instance
@@ -86,14 +216,81 @@ wxString wxIfElsePrep::Process(
 {
 	int b;
 	char ft[] = "<!--#if ";
+	char ftend[] = "<!--#endif-->";
+    char ftelse[] = "<!--#else-->";
+    char ftnot[] = "<!--#if not ";
+    char ftnot2[] = "<!--#if !";
+
+    char ftelif[] = "<!--#elif ";
 	
-	// make a copy so we can replace text as we go without affecting the original
+    // make a copy so we can replace text as we go without affecting the original
 	wxString output = text;
+
+    // Avoid duplication of our parsing code by turning any #elif blocks into appropriate
+    // else/if blocks
+    while ((b = ReverseFind(output.Lower(), ftelif)) != -1) {
+        int e;
+        // Replace beginning of block
+        e = output.find("-->", b + strlen(ftelif));
+
+        if (e == wxString::npos) {
+            #ifdef CHECKED		
+            wxMessageBox("wxHTML #elif error: Premature end of file while parsing #elif.","Error",wxICON_ERROR);
+            #endif
+            break;
+            }
+
+        // Convert to lower case so find is easy, grab everything after #elif tag
+        wxString remains = (output.Mid(e+strlen("-->"))).Lower();
+
+        // find matching else or endif
+        int nextif, nextendif;
+        int ifcount = 1, min = 0;
+        do {
+            nextif = remains.find(ft, min);
+            nextendif = remains.find(ftend, min);
+            if (nextif < nextendif && nextif != wxString::npos) {
+                ifcount++;
+                min = nextif+1;
+                }
+            else {
+                ifcount--;
+                min = nextendif+1;
+                }
+
+            if (nextendif == wxString::npos) {
+                #ifdef CHECKED		
+                wxMessageBox("wxHTML #elif error: Premature end of file before finding #endif.","Error",wxICON_ERROR);
+                #endif
+                break;
+                }
+            // once ifcount reaches 0 again we have found our matchin #endif
+            } while (ifcount > 0);
+
+        // If it couldn't be found die gracefully
+        if (nextendif == wxString::npos) {
+                // We already displayed a message, just break all the way out
+                break;
+                }
+
+        int elifsize = e - (b + strlen(ftelif)) + strlen("-->");
+        // Create the #if/else block, removing the #elif code
+        output = output.Mid(0, b) +
+            wxString(wxString(ftelse)+wxString(ft)) +
+            output.Mid(b+strlen(ftelif), elifsize+nextendif) +
+            wxString(ftend) +
+            output.Mid(b+strlen(ftelif)+elifsize+nextendif);
+
+        }
+	
+    // Parse out the if else blocks themselves
     while ((b = ReverseFind(output.Lower(), ft)) != -1) {
-		// Loop until every #echo directive is found
+		// Loop until every #if directive is found
 		// We search from the end of the string so that #if statements will properly recurse
 		// and we avoid the hassle of matching statements with the correct <!--#endif-->
-		int end, c, n;
+        bool notval = false;
+        int off = 0;
+        int end;
         wxString usecode, code;
         wxString cname;
         wxString tag;
@@ -111,29 +308,14 @@ wxString wxIfElsePrep::Process(
 			}
 
         end += 3;
-        tag = output.Mid(b, end);
+        // remove the <!--#if and --> sections from the tag before passing it on to be parsed
+        tag = output.Mid(b+strlen(ft), end-strlen(ft)-3);
         output.Remove(b, end);
 
-        c = tag.Find("-->");
-        n = c;
-
-        // find the classname
-        c = (tag.Mid(8, n-8)).Find(" ");
-	    if (c == -1) n -= 8;
-        else n = c;
-        cname = tag.Mid(8, n);
-
-        cname.Trim(false);
-        c = cname.Find("\"");
-        if (c != -1) cname = cname.Mid(c+1);
-    	c = cname.Find("\"");
-	    if (c != -1) cname = cname.Mid(0, c);
-
-        // Grab the value from the variable class identified by cname
-        value = wxIfElseVariable::FindValue(cname);
+        value = ParseIfStatementValue(tag);
 
         // Find the end of the tag (<!--#endif-->) and copy it all into the variable code
-        end = ((output.Mid(b)).Lower()).Find("<!--#endif-->");
+        end = ((output.Mid(b)).Lower()).Find(ftend);
         if (end == -1) {
 #ifdef CHECKED		
             wxMessageBox("wxHTML #if error: Premature end of file while searching for matching #endif.","Error",wxICON_ERROR);
@@ -142,14 +324,14 @@ wxString wxIfElsePrep::Process(
 			}
 
         code = output.Mid(b, end);
-        output.Remove(b, end+13); // remove the entire #if block from original document
+        output.Remove(b, end+strlen(ftend)); // remove the entire #if block from original document
 
         // Find out if there is an else statement
-        end = (code.Lower()).Find("<!--#else-->");
+        end = (code.Lower()).Find(ftelse);
         if (end != -1) {
             if (!value) {
                 // Use the else statement
-                usecode = code.Mid(end+12);
+                usecode = code.Mid(end+strlen(ftelse));
                 }
             else {
                 // Use statement before #else