Fix TOML parse failure when number token hits buffer edge (#95)

When a number token is exactly at the end of the lexer text buffer, the parser would advance the lexer, triggering a buffer refill, before the number is parsed from the buffer. This patch moves the advance operation to come after parsing, which resolves the issue.

Also tracked as FasterXML/jackson-dataformats-text#356

Fixes #93

Co-authored-by: Tim Yates <[email protected]>

Author: yawkat

toml/src/main/java/io/micronaut/toml/Parser.java

@@ -256,7 +256,12 @@ private JsonNode parseInt(int nextState) throws IOException {
             }
         }
 
+        JsonNode v = parseInt0(buffer, start, length);
         pollExpected(TomlToken.INTEGER, nextState);
+        return v;
+    }
+
+    private JsonNode parseInt0(char[] buffer, int start, int length) throws TomlStreamReadException {
         if (length > 2) {
             char baseChar = buffer[start + 1];
             if (baseChar == 'x' || baseChar == 'o' || baseChar == 'b') {

toml/src/test/java/io/micronaut/toml/ParserTest.java

@@ -1016,4 +1016,14 @@ public void unknownEscape() throws IOException {
                 Assertions.assertThrows(TomlStreamReadException.class, () -> toml("foo = \"\\k\"")).getOriginalMessage(),
                 Matchers.containsString("Unknown escape sequence"));
     }
+
+    @Test
+    // https://github.com/micronaut-projects/micronaut-toml/pull/95
+    void longInput() {
+        Assertions.assertDoesNotThrow(() -> toml(
+            "foo = \"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\"\n" +
+                "bar = 678\n" +
+                "baz = \"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\""
+        ));
+    }
 }