Merge pull request #157 from jochenberger/support-double-quotes

Support double quotes

README.md

@@ -82,7 +82,7 @@ The function output is dictated by the function itself.
 Filter Operators
 -----------------
 
-Filters are logical expressions used to filter arrays. A typical filter would be `[?(@.age > 18)]` where `@` represents the current item being processed. More complex filters can be created with logical operators `&&` and `||`. String literals must be enclosed by single quotes `[?(@.color == 'blue')]`.   
+Filters are logical expressions used to filter arrays. A typical filter would be `[?(@.age > 18)]` where `@` represents the current item being processed. More complex filters can be created with logical operators `&&` and `||`. String literals must be enclosed by single or double quotes (`[?(@.color == 'blue')]` or `[?(@.color == "blue")]`).   
 
 | Operator                 | Description                                                       |
 | :----------------------- | :---------------------------------------------------------------- |

json-path/src/main/java/com/jayway/jsonpath/internal/path/PathCompiler.java

@@ -29,6 +29,7 @@ public class PathCompiler {
     private static final char SPLIT = ':';
     private static final char MINUS = '-';
     private static final char TICK = '\'';
+    private static final char DOUBLE_QUOTE = '"';
 
     private final LinkedList<Predicate> filterStack;
     private final CharacterIndex path;
@@ -345,7 +346,11 @@ public class PathCompiler {
     // ['foo']
     //
     private boolean readBracketPropertyToken(PathTokenAppender appender) {
-        if (!path.currentCharIs(OPEN_SQUARE_BRACKET) || !path.nextSignificantCharIs(TICK)) {
+        if (!path.currentCharIs(OPEN_SQUARE_BRACKET)) {
+            return false;
+        }
+        char potentialStringDelimiter = path.nextSignificantChar();
+        if (potentialStringDelimiter != TICK && potentialStringDelimiter != DOUBLE_QUOTE) {
           return false;
         }
 
@@ -361,7 +366,7 @@ public class PathCompiler {
 
             if (c == CLOSE_SQUARE_BRACKET && !inProperty) {
                 break;
-            } else if (c == TICK) {
+            } else if (c == potentialStringDelimiter) {
                 if (inProperty) {
                     endPosition = readPosition;
                     properties.add(path.subSequence(startPosition, endPosition).toString());

json-path/src/test/java/com/jayway/jsonpath/PathCompilerTest.java

@@ -59,6 +59,7 @@ public class PathCompilerTest {
         assertThat(compile("$['1prop']").toString()).isEqualTo("$['1prop']");
         assertThat(compile("$['@prop']").toString()).isEqualTo("$['@prop']");
         assertThat(compile("$[  '@prop'  ]").toString()).isEqualTo("$['@prop']");
+        assertThat(compile("$[\"prop\"]").toString()).isEqualTo("$['prop']");
     }
 
     @Test