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A parse context is used to parse a stream of bytes that you expect to contain marked-up text.

See g_markup_parse_context_new(), #GMarkupParser, and so on for more details.

record

Hierarchy

  • MarkupParseContext

Index

Constructors

  • Creates a new parse context. A parse context is used to parse marked-up documents. You can feed any number of documents into a context, as long as no errors occur; once an error occurs, the parse context can't continue to parse text (you have to free it and create a new parse context).

    Parameters

    • parser: MarkupParser

      a #GMarkupParser

    • flags: MarkupParseFlags

      one or more #GMarkupParseFlags

    • userData: object

      user data to pass to #GMarkupParser functions

    • userDataDnotify: GLib.DestroyNotify

      user data destroy notifier called when the parse context is freed

    Returns MarkupParseContext

Properties

name: string

Methods

  • endParse(): boolean
  • Signals to the #GMarkupParseContext that all data has been fed into the parse context with g_markup_parse_context_parse().

    This function reports an error if the document isn't complete, for example if elements are still open.

    Returns boolean

  • free(): void
  • Frees a #GMarkupParseContext.

    This function can't be called from inside one of the #GMarkupParser functions or while a subparser is pushed.

    Returns void

  • getElement(): string
  • Retrieves the name of the currently open element.

    If called from the start_element or end_element handlers this will give the element_name as passed to those functions. For the parent elements, see g_markup_parse_context_get_element_stack().

    Returns string

  • getPosition(): [number, number]
  • Retrieves the current line number and the number of the character on that line. Intended for use in error messages; there are no strict semantics for what constitutes the "current" line number other than "the best number we could come up with for error messages."

    Returns [number, number]

  • getUserData(): object
  • Returns the user_data associated with context.

    This will either be the user_data that was provided to g_markup_parse_context_new() or to the most recent call of g_markup_parse_context_push().

    Returns object

  • parse(text: string, textLen: number): boolean
  • Feed some data to the #GMarkupParseContext.

    The data need not be valid UTF-8; an error will be signaled if it's invalid. The data need not be an entire document; you can feed a document into the parser incrementally, via multiple calls to this function. Typically, as you receive data from a network connection or file, you feed each received chunk of data into this function, aborting the process if an error occurs. Once an error is reported, no further data may be fed to the #GMarkupParseContext; all errors are fatal.

    Parameters

    • text: string

      chunk of text to parse

    • textLen: number

      length of text in bytes

    Returns boolean

  • pop(): object
  • Completes the process of a temporary sub-parser redirection.

    This function exists to collect the user_data allocated by a matching call to g_markup_parse_context_push(). It must be called in the end_element handler corresponding to the start_element handler during which g_markup_parse_context_push() was called. You must not call this function from the error callback -- the user_data is provided directly to the callback in that case.

    This function is not intended to be directly called by users interested in invoking subparsers. Instead, it is intended to be used by the subparsers themselves to implement a higher-level interface.

    Returns object

  • Temporarily redirects markup data to a sub-parser.

    This function may only be called from the start_element handler of a #GMarkupParser. It must be matched with a corresponding call to g_markup_parse_context_pop() in the matching end_element handler (except in the case that the parser aborts due to an error).

    All tags, text and other data between the matching tags is redirected to the subparser given by parser. user_data is used as the user_data for that parser. user_data is also passed to the error callback in the event that an error occurs. This includes errors that occur in subparsers of the subparser.

    The end tag matching the start tag for which this call was made is handled by the previous parser (which is given its own user_data) which is why g_markup_parse_context_pop() is provided to allow "one last access" to the user_data provided to this function. In the case of error, the user_data provided here is passed directly to the error callback of the subparser and g_markup_parse_context_pop() should not be called. In either case, if user_data was allocated then it ought to be freed from both of these locations.

    This function is not intended to be directly called by users interested in invoking subparsers. Instead, it is intended to be used by the subparsers themselves to implement a higher-level interface.

    As an example, see the following implementation of a simple parser that counts the number of tags encountered.

    typedef struct
    {
    gint tag_count;
    } CounterData;

    static void
    counter_start_element (GMarkupParseContext *context,
    const gchar *element_name,
    const gchar **attribute_names,
    const gchar **attribute_values,
    gpointer user_data,
    GError **error)
    {
    CounterData *data = user_data;

    data->tag_count++;
    }

    static void
    counter_error (GMarkupParseContext *context,
    GError *error,
    gpointer user_data)
    {
    CounterData *data = user_data;

    g_slice_free (CounterData, data);
    }

    static GMarkupParser counter_subparser =
    {
    counter_start_element,
    NULL,
    NULL,
    NULL,
    counter_error
    };

    In order to allow this parser to be easily used as a subparser, the following interface is provided:

    void
    start_counting (GMarkupParseContext *context)
    {
    CounterData *data = g_slice_new (CounterData);

    data->tag_count = 0;
    g_markup_parse_context_push (context, &counter_subparser, data);
    }

    gint
    end_counting (GMarkupParseContext *context)
    {
    CounterData *data = g_markup_parse_context_pop (context);
    int result;

    result = data->tag_count;
    g_slice_free (CounterData, data);

    return result;
    }

    The subparser would then be used as follows:

    static void start_element (context, element_name, ...)
    {
    if (strcmp (element_name, "count-these") == 0)
    start_counting (context);

    // else, handle other tags...
    }

    static void end_element (context, element_name, ...)
    {
    if (strcmp (element_name, "count-these") == 0)
    g_print ("Counted %d tags\n", end_counting (context));

    // else, handle other tags...
    }

    Parameters

    • parser: MarkupParser

      a #GMarkupParser

    • userData: object

      user data to pass to #GMarkupParser functions

    Returns void

  • unref(): void
  • Decreases the reference count of context. When its reference count drops to 0, it is freed.

    Returns void

  • Creates a new parse context. A parse context is used to parse marked-up documents. You can feed any number of documents into a context, as long as no errors occur; once an error occurs, the parse context can't continue to parse text (you have to free it and create a new parse context).

    Parameters

    • parser: MarkupParser

      a #GMarkupParser

    • flags: MarkupParseFlags

      one or more #GMarkupParseFlags

    • userData: object

      user data to pass to #GMarkupParser functions

    • userDataDnotify: GLib.DestroyNotify

      user data destroy notifier called when the parse context is freed

    Returns MarkupParseContext

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