diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/qpdf/JSON.hh | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/include/qpdf/JSON.hh b/include/qpdf/JSON.hh index 79f2a25f..e711a2df 100644 --- a/include/qpdf/JSON.hh +++ b/include/qpdf/JSON.hh @@ -220,7 +220,10 @@ class JSON // The start/end methods are called when parsing of a // dictionary or array is started or ended. The item methods // are called when an item is added to a dictionary or array. - // See important notes in "Item methods" below. + // When adding a container to another container, the item + // method is called with an empty container before the lower + // container's start method is called. See important notes in + // "Item methods" below. // During parsing of a JSON string, the parser is operating on // a single object at a time. When a dictionary or array is @@ -230,10 +233,10 @@ class JSON // following method calls // // dictionaryStart -- current object is the top-level dictionary + // dictionaryItem -- called with "a" and an empty array // arrayStart -- current object is the array // arrayItem -- called with the "1" object // containerEnd -- now current object is the dictionary again - // dictionaryItem -- called with "a" and the just-completed array // containerEnd -- current object is undefined // // If the top-level item in a JSON string is a scalar, the @@ -261,8 +264,12 @@ class JSON // NOTE: When a dictionary or an array is added to a // container, the dictionaryItem or arrayItem method is called // when the child item's start delimiter is encountered, so - // the JSON object passed in at that time will always be - // in its initial, empty state. + // the JSON object passed in at that time will always be in + // its initial, empty state. Additionally, the child item's + // start method is not called until after the parent item's + // item method is called. This makes it possible to keep track + // of the current depth level by incrementing level on start + // methods and decrementing on end methods. QPDF_DLL virtual bool |