603 lines
17 KiB
C
603 lines
17 KiB
C
#ifndef __LEXER_H__
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#define __LEXER_H__
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/* lexer.h -- Lexer for html parser
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(c) 1998-2008 (W3C) MIT, ERCIM, Keio University
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See tidy.h for the copyright notice.
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Given an input source, it returns a sequence of tokens.
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GetToken(source) gets the next token
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UngetToken(source) provides one level undo
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The tags include an attribute list:
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- linked list of attribute/value nodes
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- each node has 2 NULL-terminated strings.
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- entities are replaced in attribute values
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white space is compacted if not in preformatted mode
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If not in preformatted mode then leading white space
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is discarded and subsequent white space sequences
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compacted to single space characters.
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If XmlTags is no then Tag names are folded to upper
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case and attribute names to lower case.
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Not yet done:
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- Doctype subset and marked sections
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "forward.h"
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/* lexer character types
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*/
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#define digit 1u
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#define letter 2u
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#define namechar 4u
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#define white 8u
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#define newline 16u
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#define lowercase 32u
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#define uppercase 64u
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#define digithex 128u
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/* node->type is one of these values
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*/
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typedef enum
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{
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RootNode,
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DocTypeTag,
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CommentTag,
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ProcInsTag,
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TextNode,
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StartTag,
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EndTag,
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StartEndTag,
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CDATATag,
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SectionTag,
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AspTag,
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JsteTag,
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PhpTag,
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XmlDecl
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} NodeType;
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/* lexer GetToken states
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*/
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typedef enum
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{
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LEX_CONTENT,
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LEX_GT,
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LEX_ENDTAG,
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LEX_STARTTAG,
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LEX_COMMENT,
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LEX_DOCTYPE,
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LEX_PROCINSTR,
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LEX_CDATA,
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LEX_SECTION,
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LEX_ASP,
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LEX_JSTE,
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LEX_PHP,
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LEX_XMLDECL
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} LexerState;
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/* ParseDocTypeDecl state constants */
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typedef enum
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{
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DT_INTERMEDIATE,
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DT_DOCTYPENAME,
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DT_PUBLICSYSTEM,
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DT_QUOTEDSTRING,
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DT_INTSUBSET
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} ParseDocTypeDeclState;
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/* content model shortcut encoding
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Descriptions are tentative.
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*/
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#define CM_UNKNOWN 0
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/* Elements with no content. Map to HTML specification. */
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#define CM_EMPTY (1 << 0)
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/* Elements that appear outside of "BODY". */
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#define CM_HTML (1 << 1)
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/* Elements that can appear within HEAD. */
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#define CM_HEAD (1 << 2)
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/* HTML "block" elements. */
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#define CM_BLOCK (1 << 3)
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/* HTML "inline" elements. */
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#define CM_INLINE (1 << 4)
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/* Elements that mark list item ("LI"). */
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#define CM_LIST (1 << 5)
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/* Elements that mark definition list item ("DL", "DT"). */
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#define CM_DEFLIST (1 << 6)
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/* Elements that can appear inside TABLE. */
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#define CM_TABLE (1 << 7)
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/* Used for "THEAD", "TFOOT" or "TBODY". */
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#define CM_ROWGRP (1 << 8)
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/* Used for "TD", "TH" */
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#define CM_ROW (1 << 9)
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/* Elements whose content must be protected against white space movement.
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Includes some elements that can found in forms. */
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#define CM_FIELD (1 << 10)
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/* Used to avoid propagating inline emphasis inside some elements
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such as OBJECT or APPLET. */
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#define CM_OBJECT (1 << 11)
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/* Elements that allows "PARAM". */
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#define CM_PARAM (1 << 12)
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/* "FRAME", "FRAMESET", "NOFRAMES". Used in ParseFrameSet. */
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#define CM_FRAMES (1 << 13)
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/* Heading elements (h1, h2, ...). */
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#define CM_HEADING (1 << 14)
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/* Elements with an optional end tag. */
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#define CM_OPT (1 << 15)
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/* Elements that use "align" attribute for vertical position. */
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#define CM_IMG (1 << 16)
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/* Elements with inline and block model. Used to avoid calling InlineDup. */
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#define CM_MIXED (1 << 17)
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/* Elements whose content needs to be indented only if containing one
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CM_BLOCK element. */
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#define CM_NO_INDENT (1 << 18)
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/* Elements that are obsolete (such as "dir", "menu"). */
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#define CM_OBSOLETE (1 << 19)
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/* User defined elements. Used to determine how attributes wihout value
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should be printed. */
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#define CM_NEW (1 << 20)
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/* Elements that cannot be omitted. */
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#define CM_OMITST (1 << 21)
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/* If the document uses just HTML 2.0 tags and attributes described
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** it as HTML 2.0 Similarly for HTML 3.2 and the 3 flavors of HTML 4.0.
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** If there are proprietary tags and attributes then describe it as
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** HTML Proprietary. If it includes the xml-lang or xmlns attributes
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** but is otherwise HTML 2.0, 3.2 or 4.0 then describe it as one of the
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** flavors of Voyager (strict, loose or frameset).
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*/
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/* unknown */
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#define xxxx 0u
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/* W3C defined HTML/XHTML family document types */
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#define HT20 1u
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#define HT32 2u
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#define H40S 4u
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#define H40T 8u
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#define H40F 16u
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#define H41S 32u
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#define H41T 64u
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#define H41F 128u
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#define X10S 256u
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#define X10T 512u
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#define X10F 1024u
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#define XH11 2048u
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#define XB10 4096u
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/* proprietary stuff */
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#define VERS_SUN 8192u
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#define VERS_NETSCAPE 16384u
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#define VERS_MICROSOFT 32768u
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/* special flag */
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#define VERS_XML 65536u
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/* HTML5 */
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#define HT50 131072u
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#define XH50 262144u
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/* compatibility symbols */
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#define VERS_UNKNOWN (xxxx)
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#define VERS_HTML20 (HT20)
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#define VERS_HTML32 (HT32)
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#define VERS_HTML40_STRICT (H40S|H41S|X10S)
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#define VERS_HTML40_LOOSE (H40T|H41T|X10T)
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#define VERS_FRAMESET (H40F|H41F|X10F)
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#define VERS_XHTML11 (XH11)
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#define VERS_BASIC (XB10)
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/* HTML5 */
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#define VERS_HTML5 (HT50|XH50)
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/* meta symbols */
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#define VERS_HTML40 (VERS_HTML40_STRICT|VERS_HTML40_LOOSE|VERS_FRAMESET)
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#define VERS_IFRAME (VERS_HTML40_LOOSE|VERS_FRAMESET)
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#define VERS_LOOSE (VERS_HTML20|VERS_HTML32|VERS_IFRAME)
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#define VERS_EVENTS (VERS_HTML40|VERS_XHTML11)
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#define VERS_FROM32 (VERS_HTML32|VERS_HTML40|HT50)
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#define VERS_FROM40 (VERS_HTML40|VERS_XHTML11|VERS_BASIC|VERS_HTML5)
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#define VERS_XHTML (X10S|X10T|X10F|XH11|XB10|XH50)
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/* strict */
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#define VERS_STRICT (VERS_HTML5|VERS_HTML40_STRICT)
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/* all W3C defined document types */
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#define VERS_ALL (VERS_HTML20|VERS_HTML32|VERS_FROM40|XH50|HT50)
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/* all proprietary types */
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#define VERS_PROPRIETARY (VERS_NETSCAPE|VERS_MICROSOFT|VERS_SUN)
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/* Linked list of class names and styles
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*/
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struct _Style;
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typedef struct _Style TagStyle;
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struct _Style
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{
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tmbstr tag;
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tmbstr tag_class;
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tmbstr properties;
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TagStyle *next;
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};
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/* Linked list of style properties
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*/
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struct _StyleProp;
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typedef struct _StyleProp StyleProp;
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struct _StyleProp
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{
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tmbstr name;
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tmbstr value;
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StyleProp *next;
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};
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/* Attribute/Value linked list node
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*/
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struct _AttVal
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{
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AttVal* next;
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const Attribute* dict;
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Node* asp;
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Node* php;
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int delim;
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tmbstr attribute;
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tmbstr value;
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};
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/*
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Mosaic handles inlines via a separate stack from other elements
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We duplicate this to recover from inline markup errors such as:
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<i>italic text
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<p>more italic text</b> normal text
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which for compatibility with Mosaic is mapped to:
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<i>italic text</i>
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<p><i>more italic text</i> normal text
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Note that any inline end tag pop's the effect of the current
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inline start tag, so that </b> pop's <i> in the above example.
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*/
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struct _IStack
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{
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IStack* next;
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const Dict* tag; /* tag's dictionary definition */
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tmbstr element; /* name (NULL for text nodes) */
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AttVal* attributes;
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};
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/* HTML/XHTML/XML Element, Comment, PI, DOCTYPE, XML Decl,
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** etc. etc.
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*/
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struct _Node
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{
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Node* parent; /* tree structure */
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Node* prev;
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Node* next;
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Node* content;
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Node* last;
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AttVal* attributes;
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const Dict* was; /* old tag when it was changed */
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const Dict* tag; /* tag's dictionary definition */
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tmbstr element; /* name (NULL for text nodes) */
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uint start; /* start of span onto text array */
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uint end; /* end of span onto text array */
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NodeType type; /* TextNode, StartTag, EndTag etc. */
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uint line; /* current line of document */
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uint column; /* current column of document */
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Bool closed; /* true if closed by explicit end tag */
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Bool implicit; /* true if inferred */
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Bool linebreak; /* true if followed by a line break */
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};
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/*
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The following are private to the lexer
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Use NewLexer() to create a lexer, and
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FreeLexer() to free it.
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*/
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struct _Lexer
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{
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uint lines; /* lines seen */
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uint columns; /* at start of current token */
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Bool waswhite; /* used to collapse contiguous white space */
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Bool pushed; /* true after token has been pushed back */
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Bool insertspace; /* when space is moved after end tag */
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Bool excludeBlocks; /* Netscape compatibility */
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Bool exiled; /* true if moved out of table */
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Bool isvoyager; /* true if xmlns attribute on html element */
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uint versions; /* bit vector of HTML versions */
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uint doctype; /* version as given by doctype (if any) */
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uint versionEmitted; /* version of doctype emitted */
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Bool bad_doctype; /* e.g. if html or PUBLIC is missing */
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uint txtstart; /* start of current node */
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uint txtend; /* end of current node */
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LexerState state; /* state of lexer's finite state machine */
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Node* token; /* last token returned by GetToken() */
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Node* itoken; /* last duplicate inline returned by GetToken() */
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Node* root; /* remember root node of the document */
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Node* parent; /* remember parent node for CDATA elements */
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Bool seenEndBody; /* true if a </body> tag has been encountered */
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Bool seenEndHtml; /* true if a </html> tag has been encountered */
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/*
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Lexer character buffer
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Parse tree nodes span onto this buffer
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which contains the concatenated text
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contents of all of the elements.
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lexsize must be reset for each file.
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*/
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tmbstr lexbuf; /* MB character buffer */
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uint lexlength; /* allocated */
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uint lexsize; /* used */
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/* Inline stack for compatibility with Mosaic */
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Node* inode; /* for deferring text node */
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IStack* insert; /* for inferring inline tags */
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IStack* istack;
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uint istacklength; /* allocated */
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uint istacksize; /* used */
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uint istackbase; /* start of frame */
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TagStyle *styles; /* used for cleaning up presentation markup */
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TidyAllocator* allocator; /* allocator */
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};
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/* Lexer Functions
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*/
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/* choose what version to use for new doctype */
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TY_PRIVATE int TY_(HTMLVersion)( TidyDocImpl* doc );
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/* everything is allowed in proprietary version of HTML */
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/* this is handled here rather than in the tag/attr dicts */
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TY_PRIVATE void TY_(ConstrainVersion)( TidyDocImpl* doc, uint vers );
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TY_PRIVATE Bool TY_(IsWhite)(uint c);
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TY_PRIVATE Bool TY_(IsDigit)(uint c);
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TY_PRIVATE Bool TY_(IsLetter)(uint c);
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TY_PRIVATE Bool TY_(IsHTMLSpace)(uint c);
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TY_PRIVATE Bool TY_(IsNewline)(uint c);
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TY_PRIVATE Bool TY_(IsNamechar)(uint c);
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TY_PRIVATE Bool TY_(IsXMLLetter)(uint c);
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TY_PRIVATE Bool TY_(IsXMLNamechar)(uint c);
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/* Bool IsLower(uint c); */
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TY_PRIVATE Bool TY_(IsUpper)(uint c);
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TY_PRIVATE uint TY_(ToLower)(uint c);
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TY_PRIVATE uint TY_(ToUpper)(uint c);
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TY_PRIVATE Lexer* TY_(NewLexer)( TidyDocImpl* doc );
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TY_PRIVATE void TY_(FreeLexer)( TidyDocImpl* doc );
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/* store character c as UTF-8 encoded byte stream */
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TY_PRIVATE void TY_(AddCharToLexer)( Lexer *lexer, uint c );
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/*
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Used for elements and text nodes
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element name is NULL for text nodes
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start and end are offsets into lexbuf
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which contains the textual content of
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all elements in the parse tree.
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parent and content allow traversal
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of the parse tree in any direction.
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attributes are represented as a linked
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list of AttVal nodes which hold the
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strings for attribute/value pairs.
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*/
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TY_PRIVATE Node* TY_(NewNode)( TidyAllocator* allocator, Lexer* lexer );
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/* used to clone heading nodes when split by an <HR> */
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TY_PRIVATE Node* TY_(CloneNode)( TidyDocImpl* doc, Node *element );
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/* free node's attributes */
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TY_PRIVATE void TY_(FreeAttrs)( TidyDocImpl* doc, Node *node );
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/* doesn't repair attribute list linkage */
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TY_PRIVATE void TY_(FreeAttribute)( TidyDocImpl* doc, AttVal *av );
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/* detach attribute from node */
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TY_PRIVATE void TY_(DetachAttribute)( Node *node, AttVal *attr );
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/* detach attribute from node then free it
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*/
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TY_PRIVATE void TY_(RemoveAttribute)( TidyDocImpl* doc, Node *node, AttVal *attr );
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/*
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Free document nodes by iterating through peers and recursing
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through children. Set next to NULL before calling FreeNode()
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to avoid freeing peer nodes. Doesn't patch up prev/next links.
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*/
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TY_PRIVATE void TY_(FreeNode)( TidyDocImpl* doc, Node *node );
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TY_PRIVATE Node* TY_(TextToken)( Lexer *lexer );
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/* used for creating preformatted text from Word2000 */
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TY_PRIVATE Node* TY_(NewLineNode)( Lexer *lexer );
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/* used for adding a for Word2000 */
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TY_PRIVATE Node* TY_(NewLiteralTextNode)(Lexer *lexer, ctmbstr txt );
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TY_PRIVATE void TY_(AddStringLiteral)( Lexer* lexer, ctmbstr str );
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/* TY_PRIVATE void AddStringLiteralLen( Lexer* lexer, ctmbstr str, int len ); */
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/* find element */
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TY_PRIVATE Node* TY_(FindDocType)( TidyDocImpl* doc );
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TY_PRIVATE Node* TY_(FindHTML)( TidyDocImpl* doc );
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TY_PRIVATE Node* TY_(FindHEAD)( TidyDocImpl* doc );
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TY_PRIVATE Node* TY_(FindTITLE)(TidyDocImpl* doc);
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TY_PRIVATE Node* TY_(FindBody)( TidyDocImpl* doc );
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TY_PRIVATE Node* TY_(FindXmlDecl)(TidyDocImpl* doc);
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/* Returns containing block element, if any */
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TY_PRIVATE Node* TY_(FindContainer)( Node* node );
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/* add meta element for Tidy */
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TY_PRIVATE Bool TY_(AddGenerator)( TidyDocImpl* doc );
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TY_PRIVATE uint TY_(ApparentVersion)( TidyDocImpl* doc );
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TY_PRIVATE ctmbstr TY_(HTMLVersionNameFromCode)( uint vers, Bool isXhtml );
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TY_PRIVATE uint TY_(HTMLVersionNumberFromCode)( uint vers );
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TY_PRIVATE Bool TY_(WarnMissingSIInEmittedDocType)( TidyDocImpl* doc );
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TY_PRIVATE Bool TY_(SetXHTMLDocType)( TidyDocImpl* doc );
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/* fixup doctype if missing */
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TY_PRIVATE Bool TY_(FixDocType)( TidyDocImpl* doc );
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/* ensure XML document starts with <?xml version="1.0"?> */
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/* add encoding attribute if not using ASCII or UTF-8 output */
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TY_PRIVATE Bool TY_(FixXmlDecl)( TidyDocImpl* doc );
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TY_PRIVATE Node* TY_(InferredTag)(TidyDocImpl* doc, TidyTagId id);
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TY_PRIVATE void TY_(UngetToken)( TidyDocImpl* doc );
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/*
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modes for GetToken()
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MixedContent -- for elements which don't accept PCDATA
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Preformatted -- white space preserved as is
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IgnoreMarkup -- for CDATA elements such as script, style
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*/
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typedef enum
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{
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IgnoreWhitespace,
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MixedContent,
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Preformatted,
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IgnoreMarkup,
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OtherNamespace,
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CdataContent
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} GetTokenMode;
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TY_PRIVATE Node* TY_(GetToken)( TidyDocImpl* doc, GetTokenMode mode );
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TY_PRIVATE void TY_(InitMap)(void);
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/* create a new attribute */
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TY_PRIVATE AttVal* TY_(NewAttribute)( TidyDocImpl* doc );
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/* create a new attribute with given name and value */
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TY_PRIVATE AttVal* TY_(NewAttributeEx)( TidyDocImpl* doc, ctmbstr name, ctmbstr value,
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int delim );
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/* insert attribute at the end of attribute list of a node */
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TY_PRIVATE void TY_(InsertAttributeAtEnd)( Node *node, AttVal *av );
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/* insert attribute at the start of attribute list of a node */
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TY_PRIVATE void TY_(InsertAttributeAtStart)( Node *node, AttVal *av );
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/*************************************
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In-line Stack functions
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*************************************/
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/* duplicate attributes */
|
|
TY_PRIVATE AttVal* TY_(DupAttrs)( TidyDocImpl* doc, AttVal* attrs );
|
|
|
|
/*
|
|
push a copy of an inline node onto stack
|
|
but don't push if implicit or OBJECT or APPLET
|
|
(implicit tags are ones generated from the istack)
|
|
|
|
One issue arises with pushing inlines when
|
|
the tag is already pushed. For instance:
|
|
|
|
<p><em>text
|
|
<p><em>more text
|
|
|
|
Shouldn't be mapped to
|
|
|
|
<p><em>text</em></p>
|
|
<p><em><em>more text</em></em>
|
|
*/
|
|
TY_PRIVATE void TY_(PushInline)( TidyDocImpl* doc, Node* node );
|
|
|
|
/* pop inline stack */
|
|
TY_PRIVATE void TY_(PopInline)( TidyDocImpl* doc, Node* node );
|
|
|
|
TY_PRIVATE Bool TY_(IsPushed)( TidyDocImpl* doc, Node* node );
|
|
TY_PRIVATE Bool TY_(IsPushedLast)( TidyDocImpl* doc, Node *element, Node *node );
|
|
|
|
/*
|
|
This has the effect of inserting "missing" inline
|
|
elements around the contents of blocklevel elements
|
|
such as P, TD, TH, DIV, PRE etc. This procedure is
|
|
called at the start of ParseBlock. when the inline
|
|
stack is not empty, as will be the case in:
|
|
|
|
<i><h1>italic heading</h1></i>
|
|
|
|
which is then treated as equivalent to
|
|
|
|
<h1><i>italic heading</i></h1>
|
|
|
|
This is implemented by setting the lexer into a mode
|
|
where it gets tokens from the inline stack rather than
|
|
from the input stream.
|
|
*/
|
|
TY_PRIVATE int TY_(InlineDup)( TidyDocImpl* doc, Node *node );
|
|
|
|
/*
|
|
defer duplicates when entering a table or other
|
|
element where the inlines shouldn't be duplicated
|
|
*/
|
|
TY_PRIVATE void TY_(DeferDup)( TidyDocImpl* doc );
|
|
TY_PRIVATE Node* TY_(InsertedToken)( TidyDocImpl* doc );
|
|
|
|
/* stack manipulation for inline elements */
|
|
TY_PRIVATE Bool TY_(SwitchInline)( TidyDocImpl* doc, Node* element, Node* node );
|
|
TY_PRIVATE Bool TY_(InlineDup1)( TidyDocImpl* doc, Node* node, Node* element );
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
|
|
#endif /* __LEXER_H__ */
|