Add error checking for translatable strings

Translatable strings that have multiple substitutions should use
positional String.format() substitutions. This change makes it an error
not to use that format on translatable strings that have more than one
substitution in its text.

Change-Id: I3a19707f3804aa24e8568dc1653a11576cac5916

1 files changed, 111 insertions, 1 deletions

diff --git a/tools/aapt/XMLNode.cpp b/tools/aapt/XMLNode.cpp
index 4c5928880d9e..57ff47a2595e 100644
--- a/tools/aapt/XMLNode.cpp
+++ b/tools/aapt/XMLNode.cpp
@@ -68,12 +68,118 @@ String16 getNamespaceResourcePackage(String16 namespaceUri, bool* outIsPublic)
     return String16(namespaceUri, namespaceUri.size()-prefixSize, prefixSize);
 }
 
+status_t hasSubstitutionErrors(const char* fileName,
+                               ResXMLTree* inXml,
+                               String16 str16)
+{
+    const char16_t* str = str16.string();
+    const char16_t* p = str;
+    const char16_t* end = str + str16.size();
+
+    bool nonpositional = false;
+    int argCount = 0;
+
+    while (p < end) {
+        /*
+         * Look for the start of a Java-style substitution sequence.
+         */
+        if (*p == '%' && p + 1 < end) {
+            p++;
+
+            // A literal percent sign represented by %%
+            if (*p == '%') {
+                p++;
+                continue;
+            }
+
+            argCount++;
+
+            if (*p >= '0' && *p <= '9') {
+                do {
+                    p++;
+                } while (*p >= '0' && *p <= '9');
+                if (*p != '$') {
+                    // This must be a size specification instead of position.
+                    nonpositional = true;
+                }
+            } else if (*p == '<') {
+                // Reusing last argument; bad idea since it can be re-arranged.
+                nonpositional = true;
+                p++;
+
+                // Optionally '$' can be specified at the end.
+                if (p < end && *p == '$') {
+                    p++;
+                }
+            } else {
+                nonpositional = true;
+            }
+
+            // Ignore flags and widths
+            while (p < end && (*p == '-' ||
+                    *p == '#' ||
+                    *p == '+' ||
+                    *p == ' ' ||
+                    *p == ',' ||
+                    *p == '(' ||
+                    (*p >= '0' && *p <= '9'))) {
+                p++;
+            }
+
+            /*
+             * This is a shortcut to detect strings that are going to Time.format()
+             * instead of String.format()
+             *
+             * Comparison of String.format() and Time.format() args:
+             *
+             * String: ABC E GH  ST X abcdefgh  nost x
+             *   Time:    DEFGHKMS W Za  d   hkm  s w yz
+             *
+             * Therefore we know it's definitely Time if we have:
+             *     DFKMWZkmwyz
+             */
+            if (p < end) {
+                switch (*p) {
+                case 'D':
+                case 'F':
+                case 'K':
+                case 'M':
+                case 'W':
+                case 'Z':
+                case 'k':
+                case 'm':
+                case 'w':
+                case 'y':
+                case 'z':
+                    return NO_ERROR;
+                }
+            }
+        }
+
+        p++;
+    }
+
+    /*
+     * If we have more than one substitution in this string and any of them
+     * are not in positional form, give the user an error.
+     */
+    if (argCount > 1 && nonpositional) {
+        SourcePos(String8(fileName), inXml->getLineNumber()).error(
+                "Multiple substitutions specified in non-positional format; "
+                "did you mean to add the formatted=\"true\" attribute?\n");
+        return NOT_ENOUGH_DATA;
+    }
+
+    return NO_ERROR;
+}
+
 status_t parseStyledString(Bundle* bundle,
                            const char* fileName,
                            ResXMLTree* inXml,
                            const String16& endTag,
                            String16* outString,
                            Vector<StringPool::entry_style_span>* outSpans,
+                           bool isFormatted,
                            bool pseudolocalize)
 {
     Vector<StringPool::entry_style_span> spanStack;
@@ -101,7 +207,11 @@ status_t parseStyledString(Bundle* bundle,
                 std::string pseudo = pseudolocalize_string(orig);
                 curString.append(String16(String8(pseudo.c_str())));
             } else {
-                curString.append(text);
+                if (isFormatted && hasSubstitutionErrors(fileName, inXml, text) != NO_ERROR) {
+                    return UNKNOWN_ERROR;
+                } else {
+                    curString.append(text);
+                }
             }
         } else if (code == ResXMLTree::START_TAG) {
             const String16 element16(inXml->getElementName(&len));