Check in the pristine copy of ICU 4.6...

icu46/source/test/intltest/tokiter.cpp

+/*
+**********************************************************************
+* Copyright (c) 2004, International Business Machines
+* Corporation and others.  All Rights Reserved.
+**********************************************************************
+* Author: Alan Liu
+* Created: March 22 2004
+* Since: ICU 3.0
+**********************************************************************
+*/
+#include "tokiter.h"
+#include "textfile.h"
+#include "util.h"
+#include "uprops.h"
+
+TokenIterator::TokenIterator(TextFile* r) {
+    reader = r;
+    done = haveLine = FALSE;
+    pos = lastpos = -1;
+}
+
+TokenIterator::~TokenIterator() {
+}
+
+UBool TokenIterator::next(UnicodeString& token, UErrorCode& ec) {
+    if (done || U_FAILURE(ec)) {
+        return FALSE;
+    }
+    token.truncate(0);
+    for (;;) {
+        if (!haveLine) {
+            if (!reader->readLineSkippingComments(line, ec)) {
+                done = TRUE;
+                return FALSE;
+            }
+            haveLine = TRUE;
+            pos = 0;
+        }
+        lastpos = pos;
+        if (!nextToken(token, ec)) {
+            haveLine = FALSE;
+            if (U_FAILURE(ec)) return FALSE;
+            continue;
+        }
+        return TRUE;
+    }
+}
+
+int32_t TokenIterator::getLineNumber() const {
+    return reader->getLineNumber();
+}
+
+/**
+ * Read the next token from 'this->line' and append it to 'token'.
+ * Tokens are separated by rule white space.  Tokens may also be
+ * delimited by double or single quotes.  The closing quote must match
+ * the opening quote.  If a '#' is encountered, the rest of the line
+ * is ignored, unless it is backslash-escaped or within quotes.
+ * @param token the token is appended to this StringBuffer
+ * @param ec input-output error code
+ * @return TRUE if a valid token is found, or FALSE if the end
+ * of the line is reached or an error occurs
+ */
+UBool TokenIterator::nextToken(UnicodeString& token, UErrorCode& ec) {
+    ICU_Utility::skipWhitespace(line, pos, TRUE);
+    if (pos == line.length()) {
+        return FALSE;
+    }
+    UChar c = line.charAt(pos++);
+    UChar quote = 0;
+    switch (c) {
+    case 34/*'"'*/:
+    case 39/*'\\'*/:
+        quote = c;
+        break;
+    case 35/*'#'*/:
+        return FALSE;
+    default:
+        token.append(c);
+        break;
+    }
+    while (pos < line.length()) {
+        c = line.charAt(pos); // 16-bit ok
+        if (c == 92/*'\\'*/) {
+            UChar32 c32 = line.unescapeAt(pos);
+            if (c32 < 0) {
+                ec = U_MALFORMED_UNICODE_ESCAPE;
+                return FALSE;
+            }
+            token.append(c32);
+        } else if ((quote != 0 && c == quote) ||
+                   (quote == 0 && uprv_isRuleWhiteSpace(c))) {
+            ++pos;
+            return TRUE;
+        } else if (quote == 0 && c == '#') {
+            return TRUE; // do NOT increment
+        } else {
+            token.append(c);
+            ++pos;
+        }
+    }
+    if (quote != 0) {
+        ec = U_UNTERMINATED_QUOTE;
+        return FALSE;
+    }
+    return TRUE;
+}