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- October 2001, --Jcid
- Last update: Jul 2009
-
-                        ---------------
-                        THE HTML PARSER
-                        ---------------
-
-
-   Dillo's  parser is more than just a HTML parser, it does XHTML
-and  plain  text  also.  It  has  parsing 'modes' that define its
-behaviour while working:
-
-   typedef enum {
-     DILLO_HTML_PARSE_MODE_INIT = 0,
-     DILLO_HTML_PARSE_MODE_STASH,
-     DILLO_HTML_PARSE_MODE_STASH_AND_BODY,
-     DILLO_HTML_PARSE_MODE_BODY,
-     DILLO_HTML_PARSE_MODE_VERBATIM,
-     DILLO_HTML_PARSE_MODE_PRE
-   } DilloHtmlParseMode;
-
-
-   The  parser  works  upon a token-grained basis, i.e., the data
-stream is parsed into tokens and the parser is fed with them. The
-process  is  simple:  whenever  the  cache  has new data, it is
-passed to Html_write, which groups data into tokens and calls the
-appropriate functions for the token type (tag, space, or word).
-
-   Note:   when  in  DILLO_HTML_PARSE_MODE_VERBATIM,  the  parser
-doesn't  try  to  split  the  data stream into tokens anymore; it
-simply collects until the closing tag.
-
-------
-TOKENS
-------
-
-  * A chunk of WHITE SPACE     --> Html_process_space
-
-
-  * TAG                        --> Html_process_tag
-
-    The tag-start is defined by two adjacent characters:
-
-      first : '<'
-      second: ALPHA | '/' | '!' | '?'
-
-      Note: comments are discarded ( <!-- ... --> )
-
-
-    The tag's end is not as easy to find, nor to deal with!:
-
-    1)  The  HTML  4.01  sec.  3.2.2 states that "Attribute/value
-    pairs appear before the final '>' of an element's start tag",
-    but it doesn't define how to discriminate the "final" '>'.
-
-    2) '<' and '>' should be escaped as '&lt;' and '&gt;' inside
-    attribute values.
-
-    3)  The XML SPEC for XHTML states:
-      AttrValue ::== '"' ([^<&"] | Reference)* '"'   |
-                     "'" ([^<&'] | Reference)* "'"
-
-    Current  parser  honors  the XML SPEC.
-
-    As  it's  a  common  mistake  for human authors to mistype or
-    forget  one  of  the  quote  marks of an attribute value; the
-    parser   solves  the  problem  with  a  look-ahead  technique
-    (otherwise  the  parser  could  skip significant amounts of
-    properly-written HTML).
-
-
-
-  * WORD                       --> Html_process_word
-
-    A  word is anything that doesn't start with SPACE, that's
-    outside  of  a  tag, up to the first SPACE or tag start.
-
-    SPACE = ' ' | \n | \r | \t | \f | \v
-
-
------------------
-THE PARSING STACK
------------------
-
-  The parsing state of the document is kept in a stack:
-
-  class DilloHtml {
-     [...]
-     lout::misc::SimpleVector<DilloHtmlState> *stack;
-     [...]
-  };
-
-  struct _DilloHtmlState {
-     CssPropertyList *table_cell_props;
-     DilloHtmlParseMode parse_mode;
-     DilloHtmlTableMode table_mode;
-     bool cell_text_align_set;
-     DilloHtmlListMode list_type;
-     int list_number;
-
-     /* TagInfo index for the tag that's being processed */
-     int tag_idx;
-
-     dw::core::Widget *textblock, *table;
-
-     /* This is used to align list items (especially in enumerated lists) */
-     dw::core::Widget *ref_list_item;
-
-     /* This is used for list items etc; if it is set to TRUE, breaks
-        have to be "handed over" (see Html_add_indented and
-        Html_eventually_pop_dw). */
-     bool hand_over_break;
-  };
-
-  Basically,  when a TAG is processed, a new state is pushed into
-the  'stack'  and  its  'style'  is  set  to  reflect the desired
-appearance (details in DwStyle.txt).
-
-  That way, when a word is processed later (added to the Dw), all
-the information is within the top state.
-
-  Closing TAGs just pop the stack.
-
-