/*
clean.c -- clean up misuse of presentation markup
(c) 1998-2001 (W3C) MIT, INRIA, Keio University
See tidy.c for the copyright notice.
CVS Info :
$Author: terry_teague $
$Date: 2001/09/21 08:28:53 $
$Revision: 1.13 $
Filters from other formats such as Microsoft Word
often make excessive use of presentation markup such
as font tags, B, I, and the align attribute. By applying
a set of production rules, it is straight forward to
transform this to use CSS.
Some rules replace some of the children of an element by
style properties on the element, e.g.
<p><b>...</b></p> -> <p style="font-weight: bold">...</p>
Such rules are applied to the element's content and then
to the element itself until none of the rules more apply.
Having applied all the rules to an element, it will have
a style attribute with one or more properties.
Other rules strip the element they apply to, replacing
it by style properties on the contents, e.g.
<dir><li><p>...</li></dir> -> <p style="margin-left 1em">...
These rules are applied to an element before processing
its content and replace the current element by the first
element in the exposed content.
After applying both sets of rules, you can replace the
style attribute by a class value and style rule in the
document head. To support this, an association of styles
and class names is built.
A naive approach is to rely on string matching to test
when two property lists are the same. A better approach
would be to first sort the properties before matching.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "platform.h"
#include "html.h"
Node *CleanNode(Lexer *lexer, Node *node);
static void FreeStyleProps(StyleProp *props)
{
StyleProp *next;
while (props)
{
next = props->next;
MemFree(props->name);
MemFree(props->value);
MemFree(props);
props = next;
}
}
static StyleProp *InsertProperty(StyleProp *props, char *name, char *value)
{
StyleProp *first, *prev, *prop;
int cmp;
prev = null;
first = props;
while (props)
{
cmp = wstrcmp(props->name, name);
if (cmp == 0)
{
/* this property is already defined, ignore new value */
return first;
}
if (cmp > 0)
{
/* insert before this */
prop = (StyleProp *)MemAlloc(sizeof(StyleProp));
prop->name = wstrdup(name);
prop->value = wstrdup(value);
prop->next = props;
if (prev)
prev->next = prop;
else
first = prop;
return first;
}
prev = props;
props = props->next;
}
prop = (StyleProp *)MemAlloc(sizeof(StyleProp));
prop->name = wstrdup(name);
prop->value = wstrdup(value);
prop->next = null;
if (prev)
prev->next = prop;
else
first = prop;
return first;
}
/*
Create sorted linked list of properties from style string
It temporarily places nulls in place of ':' and ';' to
delimit the strings for the property name and value.
Some systems don't allow you to null literal strings,
so to avoid this, a copy is made first.
*/
static StyleProp *CreateProps(StyleProp *prop, char *style)
{
char *name, *value, *name_end, *value_end;
Bool more;
style = wstrdup(style);
name = style;
while (*name)
{
while (*name == ' ')
++name;
name_end = name;
while (*name_end)
{
if (*name_end == ':')
{
value = name_end + 1;
break;
}
++name_end;
}
if (*name_end != ':')
break;
while (*value == ' ')
++value;
value_end = value;
more = no;
while (*value_end)
{
if (*value_end == ';')
{
more = yes;
break;
}
++value_end;
}
*name_end = '\0';
*value_end = '\0';
prop = InsertProperty(prop, name, value);
*name_end = ':';
if (more)
{
*value_end = ';';
name = value_end + 1;
continue;
}
break;
}
MemFree(style); /* free temporary copy */
return prop;
}
static char *CreatePropString(StyleProp *props)
{
char *style, *p, *s;
int len;
StyleProp *prop;
/* compute length */
for (len = 0, prop = props; prop; prop = prop->next)
{
len += wstrlen(prop->name) + 2;
len += wstrlen(prop->value) + 2;
}
style = (char *)MemAlloc(len+1);
for (p = style, prop = props; prop; prop = prop->next)
{
s = prop->name;
while((*p++ = *s++));
*--p = ':';
*++p = ' ';
++p;
s = prop->value;
while((*p++ = *s++));
if (prop->next == null)
break;
*--p = ';';
*++p = ' ';
++p;
}
return style;
}
/*
create string with merged properties
*/
static char *AddProperty(char *style, char *property)
{
StyleProp *prop;
prop = CreateProps(null, style);
prop = CreateProps(prop, property);
style = CreatePropString(prop);
FreeStyleProps(prop);
return style;
}
void FreeStyles(Lexer *lexer)
{
Style *style, *next;
for (style = lexer->styles; style; style = next)
{
next = style->next;
MemFree(style->tag);
MemFree(style->tag_class);
MemFree(style->properties);
MemFree(style);
}
}
static char *GensymClass(char *tag)
{
static int n = 1;
char buf[128];
sprintf(buf, "c%d", n++);
return wstrdup(buf);
}
static char *FindStyle(Lexer *lexer, char *tag, char *properties)
{
Style *style;
for (style = lexer->styles; style; style=style->next)
{
if (wstrcmp(style->tag, tag) == 0 &&
wstrcmp(style->properties, properties) == 0)
return style->tag_class;
}
style = (Style *)MemAlloc(sizeof(Style));
style->tag = wstrdup(tag);
style->tag_class = GensymClass(tag);
style->properties = wstrdup(properties);
style->next = lexer->styles;
lexer->styles = style;
return style->tag_class;
}
/*
Add class="foo" to node
*/
void AddClass(Node *node, char *classname)
{
AttVal *classattr = GetAttrByName(node, "class");
/*
if there already is a class attribute
then append class name after a space
*/
if (classattr)
{
int len = wstrlen(classattr->value) +
wstrlen(classname) + 2;
char *s = (char *)MemAlloc(len *sizeof(char)); /* #427668 - was malloc() - fix by Arnaud BERCEGEAY 05 Aug 00 */
wstrcpy(s, classattr->value);
wstrcat(s, " ");
wstrcat(s, classname);
MemFree(classattr->value);
classattr->value = s;
}
else /* create new class attribute */
AddAttribute(node, "class", classname);
}
/*
Find style attribute in node, and replace it
by corresponding class attribute. Search for
class in style dictionary otherwise gensym
new class and add to dictionary.
Assumes that node doesn't have a class attribute
*/
static void Style2Rule(Lexer *lexer, Node *node)
{
AttVal *styleattr, *classattr;
char *classname;
styleattr = GetAttrByName(node, "style");
if (styleattr)
{
classname = FindStyle(lexer, node->element, styleattr->value);
classattr = GetAttrByName(node, "class");
/*
if there already is a class attribute
then append class name after a space
*/
if (classattr)
{
int len = wstrlen(classattr->value) +
wstrlen(classname) + 2;
char *s = (char *)MemAlloc(len *sizeof(char)); /* #427668 - was malloc() - fix by Arnaud BERCEGEAY 05 Aug 00 */
wstrcpy(s, classattr->value);
wstrcat(s, " ");
wstrcat(s, classname);
MemFree(classattr->value);
classattr->value = s;
RemoveAttribute(node, styleattr);
}
else /* reuse style attribute for class attribute */
{
MemFree(styleattr->attribute);
MemFree(styleattr->value);
styleattr->attribute = wstrdup("class");
styleattr->value = wstrdup(classname);
}
}
}
static void AddColorRule(Lexer *lexer, char *selector, char *color)
{
if (color)
{
AddStringLiteral(lexer, selector);
AddStringLiteral(lexer, " { color: ");
AddStringLiteral(lexer, color);
AddStringLiteral(lexer, " }\n");
}
}
/*
move presentation attribs from body to style element
background="foo" -> body { background-image: url(foo) }
bgcolor="foo" -> body { background-color: foo }
text="foo" -> body { color: foo }
link="foo" -> :link { color: foo }
vlink="foo" -> :visited { color: foo }
alink="foo" -> :active { color: foo }
*/
static void CleanBodyAttrs(Lexer *lexer, Node *body)
{
AttVal *attr;
char *bgurl = null;
char *bgcolor = null;
char *color = null;
attr = GetAttrByName(body, "background");
if (attr)
{
bgurl = attr->value;
attr->value = null;
RemoveAttribute(body, attr);
}
attr = GetAttrByName(body, "bgcolor");
if (attr)
{
bgcolor = attr->value;
attr->value = null;
RemoveAttribute(body, attr);
}
attr = GetAttrByName(body, "text");
if (attr)
{
color = attr->value;
attr->value = null;
RemoveAttribute(body, attr);
}
if (bgurl || bgcolor || color)
{
AddStringLiteral(lexer, " body {\n");
if (bgurl)
{
AddStringLiteral(lexer, " background-image: url(");
AddStringLiteral(lexer, bgurl);
AddStringLiteral(lexer, ");\n");
MemFree(bgurl);
}
if (bgcolor)
{
AddStringLiteral(lexer, " background-color: ");
AddStringLiteral(lexer, bgcolor);
AddStringLiteral(lexer, ";\n");
MemFree(bgcolor);
}
if (color)
{
AddStringLiteral(lexer, " color: ");
AddStringLiteral(lexer, color);
AddStringLiteral(lexer, ";\n");
MemFree(color);
}
AddStringLiteral(lexer, " }\n");
}
attr = GetAttrByName(body, "link");
if (attr)
{
AddColorRule(lexer, " :link", attr->value);
RemoveAttribute(body, attr);
}
attr = GetAttrByName(body, "vlink");
if (attr)
{
AddColorRule(lexer, " :visited", attr->value);
RemoveAttribute(body, attr);
}
attr = GetAttrByName(body, "alink");
if (attr)
{
AddColorRule(lexer, " :active", attr->value);
RemoveAttribute(body, attr);
}
}
static Bool NiceBody(Lexer *lexer, Node *doc)
{
Node *body = FindBody(doc);
if (body)
{
if (
GetAttrByName(body, "background") ||
GetAttrByName(body, "bgcolor") ||
GetAttrByName(body, "text") ||
GetAttrByName(body, "link") ||
GetAttrByName(body, "vlink") ||
GetAttrByName(body, "alink")
)
{
lexer->badLayout |= USING_BODY;
return no;
}
}
return yes;
}
/* create style element using rules from dictionary */
static void CreateStyleElement(Lexer *lexer, Node *doc)
{
Node *node, *head, *body;
Style *style;
AttVal *av;
if (lexer->styles == null && NiceBody(lexer, doc))
return;
node = NewNode();
node->type = StartTag;
node->implicit = yes;
node->element = wstrdup("style");
FindTag(node);
/* insert type attribute */
av = NewAttribute();
av->attribute = wstrdup("type");
av->value = wstrdup("text/css");
av->delim = '"';
av->dict = FindAttribute(av);
node->attributes = av;
body = FindBody(doc);
lexer->txtstart = lexer->lexsize;
if (body)
CleanBodyAttrs(lexer, body);
for (style = lexer->styles; style; style = style->next)
{
AddCharToLexer(lexer, ' ');
AddStringLiteral(lexer, style->tag);
AddCharToLexer(lexer, '.');
AddStringLiteral(lexer, style->tag_class);
AddCharToLexer(lexer, ' ');
AddCharToLexer(lexer, '{');
AddStringLiteral(lexer, style->properties);
AddCharToLexer(lexer, '}');
AddCharToLexer(lexer, '\n');
}
lexer->txtend = lexer->lexsize;
InsertNodeAtEnd(node, TextToken(lexer));
/*
now insert style element into document head
doc is root node. search its children for html node
the head node should be first child of html node
*/
head = FindHEAD(doc);
if (head)
InsertNodeAtEnd(head, node);
}
/* ensure bidirectional links are consistent */
static void FixNodeLinks(Node *node)
{
Node *child;
if (node->prev)
node->prev->next = node;
else
node->parent->content = node;
if (node->next)
node->next->prev = node;
else
node->parent->last = node;
for (child = node->content; child; child = child->next)
child->parent = node;
}
/*
used to strip child of node when
the node has one and only one child
*/
static void StripOnlyChild(Node *node)
{
Node *child;
child = node->content;
node->content = child->content;
node->last = child->last;
child->content = null;
FreeNode(child);
for (child = node->content; child; child = child->next)
child->parent = node;
}
/* used to strip font start and end tags */
static void DiscardContainer(Node *element, Node **pnode)
{
Node *node, *parent = element->parent;
if (element->content)
{
element->last->next = element->next;
if (element->next)
{
element->next->prev = element->last;
element->last->next = element->next;
}
else
parent->last = element->last;
if (element->prev)
{
element->content->prev = element->prev;
element->prev->next = element->content;
}
else
parent->content = element->content;
for (node = element->content; node; node = node->next)
node->parent = parent;
*pnode = element->content;
}
else
{
if (element->next)
element->next->prev = element->prev;
else
parent->last = element->prev;
if (element->prev)
element->prev->next = element->next;
else
parent->content = element->next;
*pnode = element->next;
}
element->next = element->content = null;
FreeNode(element);
}
/*
Add style property to element, creating style
attribute as needed and adding ; delimiter
*/
static void AddStyleProperty(Node *node, char *property)
{
AttVal *av;
for (av = node->attributes; av; av = av->next)
{
if (wstrcmp(av->attribute, "style") == 0)
break;
}
/* if style attribute already exists then insert property */
if (av)
{
char *s;
s = AddProperty(av->value, property);
MemFree(av->value);
av->value = s;
}
else /* else create new style attribute */
{
av = NewAttribute();
av->attribute = wstrdup("style");
av->value = wstrdup(property);
av->delim = '"';
av->dict = FindAttribute(av);
av->next = node->attributes;
node->attributes = av;
}
}
/*
Create new string that consists of the
combined style properties in s1 and s2
To merge property lists, we build a linked
list of property/values and insert properties
into the list in order, merging values for
the same property name.
*/
static char *MergeProperties(char *s1, char *s2)
{
char *s;
StyleProp *prop;
prop = CreateProps(null, s1);
prop = CreateProps(prop, s2);
s = CreatePropString(prop);
FreeStyleProps(prop);
return s;
}
static void MergeClasses(Node *node, Node *child)
{
AttVal *av;
char *s1, *s2, *names;
for (s2 = null, av = child->attributes; av; av = av->next)
{
if (wstrcmp(av->attribute, "class") == 0)
{
s2 = av->value;
break;
}
}
for (s1 = null, av = node->attributes; av; av = av->next)
{
if (wstrcmp(av->attribute, "class") == 0)
{
s1 = av->value;
break;
}
}
if (s1)
{
if (s2) /* merge class names from both */
{
int l1, l2;
l1 = wstrlen(s1);
l2 = wstrlen(s2);
names = (char *)MemAlloc(l1 + l2 + 2);
wstrcpy(names, s1);
names[l1] = ' ';
wstrcpy(names+l1+1, s2);
MemFree(av->value);
av->value = names;
}
}
else if (s2) /* copy class names from child */
{
av = NewAttribute();
av->attribute = wstrdup("class");
av->value = wstrdup(s2);
av->delim = '"';
av->dict = FindAttribute(av);
av->next = node->attributes;
node->attributes = av;
}
}
static void MergeStyles(Node *node, Node *child)
{
AttVal *av;
char *s1, *s2, *style;
/*
the child may have a class attribute used
for attaching styles, if so the class name
needs to be copied to node's class
*/
MergeClasses(node, child);
for (s2 = null, av = child->attributes; av; av = av->next)
{
if (wstrcmp(av->attribute, "style") == 0)
{
s2 = av->value;
break;
}
}
for (s1 = null, av = node->attributes; av; av = av->next)
{
if (wstrcmp(av->attribute, "style") == 0)
{
s1 = av->value;
break;
}
}
if (s1)
{
if (s2) /* merge styles from both */
{
style = MergeProperties(s1, s2);
MemFree(av->value);
av->value = style;
}
}
else if (s2) /* copy style of child */
{
av = NewAttribute();
av->attribute = wstrdup("style");
av->value = wstrdup(s2);
av->delim = '"';
av->dict = FindAttribute(av);
av->next = node->attributes;
node->attributes = av;
}
}
static char *FontSize2Name(char *size)
{
#if 0
static char *sizes[7] =
{
"50%", "60%", "80%", null,
"120%", "150%", "200%"
};
#else
static char *sizes[7] =
{
"60%", "70%", "80%", null,
"120%", "150%", "200%"
};
#endif
static char buf[16];
if ('0' <= size[0] && size[0] <= '6')
{
int n = size[0] - '0';
return sizes[n];
}
if (size[0] == '-')
{
if ('0' <= size[1] && size[1] <= '6')
{
int n = size[1] - '0';
double x;
for (x = 1; n > 0; --n)
x *= 0.8;
x *= 100;
sprintf(buf, "%d%%", (int)(x));
return buf;
}
return "smaller"; /*"70%"; */
}
if ('0' <= size[1] && size[1] <= '6')
{
int n = size[1] - '0';
double x;
for (x = 1; n > 0; --n)
x *= 1.2;
x *= 100;
sprintf(buf, "%d%%", (int)(x));
return buf;
}
return "larger"; /* "140%" */
}
static void AddFontFace(Node *node, char *face)
{
char buf[1024];
sprintf(buf, "font-family: %s", face);
AddStyleProperty(node, buf);
}
static void AddFontSize(Node *node, char *size)
{
char *value, buf[1024];
if (wstrcmp(size, "6") == 0 && node->tag == tag_p)
{
MemFree(node->element);
node->element = wstrdup("h1");
FindTag(node);
return;
}
if (wstrcmp(size, "5") == 0 && node->tag == tag_p)
{
MemFree(node->element);
node->element = wstrdup("h2");
FindTag(node);
return;
}
if (wstrcmp(size, "4") == 0 && node->tag == tag_p)
{
MemFree(node->element);
node->element = wstrdup("h3");
FindTag(node);
return;
}
value = FontSize2Name(size);
if (value)
{
sprintf(buf, "font-size: %s", value);
AddStyleProperty(node, buf);
}
}
static void AddFontColor(Node *node, char *color)
{
char buf[1024];
sprintf(buf, "color: %s", color);
AddStyleProperty(node, buf);
}
static void AddAlign(Node *node, char *align)
{
char buf[1024], *p, *q;
/* force alignment value to lower case */
for (p = buf, q = "text-align: "; (*p++ = *q++););
for (p = p-1; (*p++ = ToLower(*align++)););
AddStyleProperty(node, buf);
}
/*
add style properties to node corresponding to
the font face, size and color attributes
*/
static void AddFontStyles(Node *node, AttVal *av)
{
while (av)
{
if (wstrcmp(av->attribute, "face") == 0)
AddFontFace(node, av->value);
else if (wstrcmp(av->attribute, "size") == 0)
AddFontSize(node, av->value);
else if (wstrcmp(av->attribute, "color") == 0)
AddFontColor(node, av->value);
av = av->next;
}
}
/*
Symptom: <p align=center>
Action: <p style="text-align: center">
*/
static void TextAlign(Lexer *lexer, Node *node)
{
AttVal *av, *prev;
prev = null;
for (av = node->attributes; av; av = av->next)
{
if (wstrcmp(av->attribute, "align") == 0)
{
if (prev)
prev->next = av->next;
else
node->attributes = av->next;
MemFree(av->attribute);
if (av->value)
{
AddAlign(node, av->value);
MemFree(av->value);
}
MemFree(av);
break;
}
prev = av;
}
}
/*
The clean up rules use the pnode argument to return the
next node when the orignal node has been deleted
*/
/*
Symptom: <dir> <li> where <li> is only child
Action: coerce <dir> <li> to <div> with indent.
*/
static Bool Dir2Div(Lexer *lexer, Node *node, Node **pnode)
{
Node *child;
if (node->tag == tag_dir || node->tag == tag_ul || node->tag == tag_ol)
{
child = node->content;
if (child == null)
return no;
/* check child has no peers */
if (child->next)
return no;
if (child->tag != tag_li)
return no;
if (!child->implicit)
return no;
/* coerce dir to div */
node->tag = tag_div;
MemFree(node->element);
node->element = wstrdup("div");
AddStyleProperty(node, "margin-left: 2em");
StripOnlyChild(node);
return yes;
#if 0
content = child->content;
last = child->last;
child->content = null;
/* adjust parent and set margin on contents of <li> */
for (child = content; child; child = child->next)
{
child->parent = node->parent;
AddStyleProperty(child, "margin-left: 1em");
}
/* hook first/last into sequence */
if (content)
{
content->prev = node->prev;
last->next = node->next;
FixNodeLinks(content);
FixNodeLinks(last);
}
node->next = null;
FreeNode(node);
/* ensure that new node is cleaned */
*pnode = CleanNode(lexer, content);
return yes;
#endif
}
return no;
}
/*
Symptom: <center>
Action: replace <center> by <div style="text-align: center">
*/
static Bool Center2Div(Lexer *lexer, Node *node, Node **pnode)
{
if (node->tag == tag_center)
{
if (DropFontTags)
{
if (node->content)
{
Node *last = node->last, *parent = node->parent;
DiscardContainer(node, pnode);
node = InferredTag(lexer, "br");
if (last->next)
last->next->prev = node;
node->next = last->next;
last->next = node;
node->prev = last;
if (parent->last == last)
parent->last = node;
node->parent = parent;
}
else
{
Node *prev = node->prev, *next = node->next, *parent = node->parent;
DiscardContainer(node, pnode);
node = InferredTag(lexer, "br");
node->next = next;
node->prev = prev;
node->parent = parent;
if (next)
next->prev = node;
else
parent->last = node;
if (prev)
prev->next = node;
else
parent->content = node;
}
return yes;
}
node->tag = tag_div;
MemFree(node->element);
node->element = wstrdup("div");
AddStyleProperty(node, "text-align: center");
return yes;
}
return no;
}
/*
Symptom <div><div>...</div></div>
Action: merge the two divs
This is useful after nested <dir>s used by Word
for indenting have been converted to <div>s
*/
static Bool MergeDivs(Lexer *lexer, Node *node, Node **pnode)
{
Node *child;
if (node->tag != tag_div)
return no;
child = node->content;
if (!child)
return no;
if (child->tag != tag_div)
return no;
if (child->next != null)
return no;
MergeStyles(node, child);
StripOnlyChild(node);
return yes;
}
/*
Symptom: <ul><li><ul>...</ul></li></ul>
Action: discard outer list
*/
static Bool NestedList(Lexer *lexer, Node *node, Node **pnode)
{
Node *child, *list;
if (node->tag == tag_ul || node->tag == tag_ol)
{
child = node->content;
if (child == null)
return no;
/* check child has no peers */
if (child->next)
return no;
list = child->content;
if (!list)
return no;
if (list->tag != node->tag)
return no;
*pnode = list; /* Set node to resume iteration */
/* move inner list node into position of outer node */
list->prev = node->prev;
list->next = node->next;
list->parent = node->parent;
FixNodeLinks(list);
/* get rid of outer ul and its li */
/* XXX: Are we leaking the child node? -creitzel 7 Jun, 01 */
child->content = null;
node->content = null;
node->next = null;
FreeNode(node);
node = null;
/*
If prev node was a list the chances are this node
should be appended to that list. Word has no way of
recognizing nested lists and just uses indents
*/
if (list->prev)
{
if (list->prev->tag == tag_ul || list->prev->tag == tag_ol)
{
node = list;
list = node->prev;
list->next = node->next;
if (list->next)
list->next->prev = list;
child = list->last; /* <li> */
node->parent = child;
node->next = null;
node->prev = child->last;
FixNodeLinks(node);
CleanNode(lexer, node);
}
}
return yes;
}
return no;
}
/*
Symptom: the only child of a block-level element is a
presentation element such as B, I or FONT
Action: add style "font-weight: bold" to the block and
strip the <b> element, leaving its children.
example:
<p>
<b><font face="Arial" size="6">Draft Recommended Practice</font></b>
</p>
becomes:
<p style="font-weight: bold; font-family: Arial; font-size: 6">
Draft Recommended Practice
</p>
This code also replaces the align attribute by a style attribute.
However, to avoid CSS problems with Navigator 4, this isn't done
for the elements: caption, tr and table
*/
static Bool BlockStyle(Lexer *lexer, Node *node, Node **pnode)
{
Node *child;
if (node->tag->model & (CM_BLOCK | CM_LIST | CM_DEFLIST | CM_TABLE))
{
if (node->tag != tag_table
&& node->tag != tag_tr
&& node->tag != tag_li)
{
/* check for align attribute */
if (node->tag != tag_caption)
TextAlign(lexer, node);
child = node->content;
if (child == null)
return no;
/* check child has no peers */
if (child->next)
return no;
if (child->tag == tag_b)
{
MergeStyles(node, child);
AddStyleProperty(node, "font-weight: bold");
StripOnlyChild(node);
return yes;
}
if (child->tag == tag_i)
{
MergeStyles(node, child);
AddStyleProperty(node, "font-style: italic");
StripOnlyChild(node);
return yes;
}
if (child->tag == tag_font)
{
MergeStyles(node, child);
AddFontStyles(node, child->attributes);
StripOnlyChild(node);
return yes;
}
}
}
return no;
}
/* the only child of table cell or an inline element such as em */
static Bool InlineStyle(Lexer *lexer, Node *node, Node **pnode)
{
Node *child;
if (node->tag != tag_font && (node->tag->model & (CM_INLINE|CM_ROW)))
{
child = node->content;
if (child == null)
return no;
/* check child has no peers */
if (child->next)
return no;
if (child->tag == tag_b && LogicalEmphasis)
{
MergeStyles(node, child);
AddStyleProperty(node, "font-weight: bold");
StripOnlyChild(node);
return yes;
}
if (child->tag == tag_i && LogicalEmphasis)
{
MergeStyles(node, child);
AddStyleProperty(node, "font-style: italic");
StripOnlyChild(node);
return yes;
}
if (child->tag == tag_font)
{
MergeStyles(node, child);
AddFontStyles(node, child->attributes);
StripOnlyChild(node);
return yes;
}
}
return no;
}
/*
Replace font elements by span elements, deleting
the font element's attributes and replacing them
by a single style attribute.
*/
static Bool Font2Span(Lexer *lexer, Node *node, Node **pnode)
{
AttVal *av, *style, *next;
if (node->tag == tag_font)
{
if (DropFontTags)
{
DiscardContainer(node, pnode);
return no;
}
/* if FONT is only child of parent element then leave alone */
if (node->parent->content == node
&& node->next == null)
return no;
AddFontStyles(node, node->attributes);
/* extract style attribute and free the rest */
av = node->attributes;
style = null;
while (av)
{
next = av->next;
if (wstrcmp(av->attribute, "style") == 0)
{
av->next = null;
style = av;
}
else
{
if (av->attribute)
MemFree(av->attribute);
if (av->value)
MemFree(av->value);
MemFree(av);
}
av = next;
}
node->attributes = style;
node->tag = tag_span;
MemFree(node->element);
node->element = wstrdup("span");
return yes;
}
return no;
}
static Bool IsElement(Node *node)
{
return (node->type == StartTag || node->type == StartEndTag ? yes : no);
}
/*
Applies all matching rules to a node.
*/
Node *CleanNode(Lexer *lexer, Node *node)
{
Node *next = null;
for (next = node; node && IsElement(node); node = next)
{
if (Dir2Div(lexer, node, &next))
continue;
/* Special case: true result means
** that arg node and its parent no longer exist.
** So we must jump back up the CreateStyleProperties()
** call stack until we have a valid node reference.
*/
if (NestedList(lexer, node, &next))
return next;
if (Center2Div(lexer, node, &next))
continue;
if (MergeDivs(lexer, node, &next))
continue;
if (BlockStyle(lexer, node, &next))
continue;
if (InlineStyle(lexer, node, &next))
continue;
if (Font2Span(lexer, node, &next))
continue;
break;
}
return next;
}
/* Special case: if the current node is destroyed by
** CleanNode() lower in the tree, this node and its
** parent no longer exist. So we must jump back up
** the CreateStyleProperties() call stack until we
** have a valid node reference.
*/
static Node *CreateStyleProperties(Lexer *lexer, Node *node, Node** prepl)
{
Node *child;
if (node->content)
{
Node* repl = node;
for (child = node->content; child != null; child = child->next)
{
child = CreateStyleProperties(lexer, child, &repl);
if ( repl != node )
return repl;
}
}
return CleanNode(lexer, node);
}
static void DefineStyleRules(Lexer *lexer, Node *node)
{
Node *child;
if (node->content)
{
for (child = node->content;
child != null; child = child->next)
{
DefineStyleRules(lexer, child);
}
}
Style2Rule(lexer, node);
}
void CleanTree(Lexer *lexer, Node *doc)
{
Node* repl = doc;
doc = CreateStyleProperties(lexer, doc, &repl);
if (MakeClean)
{
DefineStyleRules(lexer, doc);
CreateStyleElement(lexer, doc);
}
}
/* simplifies <b><b> ... </b> ...</b> etc. */
void NestedEmphasis(Node *node)
{
Node *next;
while (node)
{
next = node->next;
if ((node->tag == tag_b || node->tag == tag_i)
&& node->parent && node->parent->tag == node->tag)
{
/* strip redundant inner element */
DiscardContainer(node, &next);
node = next;
continue;
}
if (node->content)
NestedEmphasis(node->content);
node = next;
}
}
/* replace i by em and b by strong */
void EmFromI(Node *node)
{
while (node)
{
if (node->tag == tag_i)
{
MemFree(node->element);
node->element = wstrdup(tag_em->name);
node->tag = tag_em;
}
else if (node->tag == tag_b)
{
MemFree(node->element);
node->element = wstrdup(tag_strong->name);
node->tag = tag_strong;
}
if (node->content)
EmFromI(node->content);
node = node->next;
}
}
static Bool HasOneChild(Node *node)
{
return (node->content && node->content->next == null);
}
/*
Some people use dir or ul without an li
to indent the content. The pattern to
look for is a list with a single implicit
li. This is recursively replaced by an
implicit blockquote.
*/
void List2BQ(Node *node)
{
while (node)
{
if (node->content)
List2BQ(node->content);
if (node->tag && node->tag->parser == ParseList &&
HasOneChild(node) && node->content->implicit)
{
StripOnlyChild(node);
MemFree(node->element);
node->element = wstrdup(tag_blockquote->name);
node->tag = tag_blockquote;
node->implicit = yes;
}
node = node->next;
}
}
static char indent_buf[32];
/*
Replace implicit blockquote by div with an indent
taking care to reduce nested blockquotes to a single
div with the indent set to match the nesting depth
*/
void BQ2Div(Node *node)
{
int indent;
while (node)
{
if (node->tag == tag_blockquote && node->implicit)
{
indent = 1;
while(HasOneChild(node) &&
node->content->tag == tag_blockquote &&
node->implicit)
{
++indent;
StripOnlyChild(node);
}
if (node->content)
BQ2Div(node->content);
sprintf(indent_buf, "margin-left: %dem", 2*indent);
MemFree(node->element);
node->element = wstrdup(tag_div->name);
node->tag = tag_div;
AddAttribute(node, "style", indent_buf);
}
else if (node->content)
BQ2Div(node->content);
node = node->next;
}
}
Node *FindEnclosingCell(Node *node)
{
Node *check;
for ( check=node; check; check = check->parent )
{
if ( check->tag == tag_td )
return check;
}
return null;
}
/* node is <![if ...]> prune up to <![endif]> */
static Node *PruneSection(Lexer *lexer, Node *node)
{
for (;;)
{
if (wstrncmp(lexer->lexbuf + node->start, "if !supportEmptyParas", 21) == 0)
{
Node* cell = FindEnclosingCell( node );
if ( cell )
{
/* Need to put into cell so it doesn't look weird */
char onesixty[2] = { (char) 160, (char)0 };
Node* nbsp = NewLiteralTextNode( lexer, onesixty );
InsertNodeBeforeElement( node, nbsp );
}
}
/* discard node and returns next */
node = DiscardElement(node);
if (node == null)
return null;
if (node->type == SectionTag)
{
if (wstrncmp(lexer->lexbuf + node->start, "if", 2) == 0)
{
node = PruneSection(lexer, node);
continue;
}
if (wstrncmp(lexer->lexbuf + node->start, "endif", 5) == 0)
{
node = DiscardElement(node);
break;
}
}
}
return node;
}
void DropSections(Lexer *lexer, Node *node)
{
while (node)
{
if (node->type == SectionTag)
{
/* prune up to matching endif */
if ((wstrncmp(lexer->lexbuf + node->start, "if", 2) == 0) &&
(wstrncmp(lexer->lexbuf + node->start, "if !vml", 7) != 0)) /* #444394 - fix 13 Sep 01 */
{
node = PruneSection(lexer, node);
continue;
}
/* discard others as well */
node = DiscardElement(node);
continue;
}
if (node->content)
DropSections(lexer, node->content);
node = node->next;
}
}
static void PurgeWord2000Attributes(Node *node)
{
AttVal *attr, *next, *prev = null;
for ( attr = node->attributes; attr; attr = next )
{
next = attr->next;
/* special check for class="Code" denoting pre text */
/* Pass thru user defined styles as HTML class names */
if (wstrcmp(attr->attribute, "class") == 0)
{
if ( wstrcmp(attr->value, "Code") == 0 ||
wstrncmp(attr->value, "Mso", 3) != 0 )
{
prev = attr;
continue;
}
}
if ( wstrcmp(attr->attribute, "class") == 0 ||
wstrcmp(attr->attribute, "style") == 0 ||
wstrcmp(attr->attribute, "lang") == 0 ||
wstrncmp(attr->attribute, "x:", 2) == 0 ||
( ( wstrcmp(attr->attribute, "height") == 0 ||
wstrcmp(attr->attribute, "width") == 0 ) &&
( node->tag == tag_td ||
node->tag == tag_tr ||
node->tag == tag_th ) )
)
{
if (prev)
prev->next = next;
else
node->attributes = next;
FreeAttribute(attr);
}
else
prev = attr;
}
}
/* Word2000 uses span excessively, so we strip span out */
static Node *StripSpan(Lexer *lexer, Node *span)
{
Node *node, *prev = null, *content;
/*
deal with span elements that have content
by splicing the content in place of the span
after having processed it
*/
CleanWord2000(lexer, span->content);
content = span->content;
if (span->prev)
prev = span->prev;
else if (content)
{
node = content;
content = content->next;
RemoveNode(node);
InsertNodeBeforeElement(span, node);
prev = node;
}
while (content)
{
node = content;
content = content->next;
RemoveNode(node);
InsertNodeAfterElement(prev, node);
prev = node;
}
if (span->next == null)
span->parent->last = prev;
node = span->next;
span->content = null;
DiscardElement(span);
return node;
}
/* map non-breaking spaces to regular spaces */
static void NormalizeSpaces(Lexer *lexer, Node *node)
{
while (node)
{
if (node->content)
NormalizeSpaces(lexer, node->content);
if (node->type == TextNode)
{
uint i, c;
char *p = lexer->lexbuf + node->start;
for (i = node->start; i < node->end; ++i)
{
c = (unsigned char)lexer->lexbuf[i];
/* look for UTF-8 multibyte character */
if (c > 0x7F)
i += GetUTF8((unsigned char *)(lexer->lexbuf + i), &c);
if (c == 160)
c = ' ';
p = PutUTF8(p, c);
}
}
node = node->next;
}
}
/* used to hunt for hidden preformatted sections */
Bool NoMargins(Node *node)
{
AttVal *attval = GetAttrByName(node, "style");
if (attval == null)
return no;
/* search for substring "margin-top: 0" */
if (!wsubstr(attval->value, "margin-top: 0"))
return no;
/* search for substring "margin-top: 0" */
if (!wsubstr(attval->value, "margin-bottom: 0"))
return no;
return yes;
}
/* does element have a single space as its content? */
Bool SingleSpace(Lexer *lexer, Node *node)
{
if (node->content)
{
node = node->content;
if (node->next != null)
return no;
if (node->type != TextNode)
return no;
if (((node->end - node->start) == 1) &&
lexer->lexbuf[node->start] == ' ')
return yes;
if ((node->end - node->start) == 2)
{
uint c;
GetUTF8((unsigned char *)lexer->lexbuf + node->start, &c);
if (c == 160)
return yes;
}
}
return no;
}
/*
This is a major clean up to strip out all the extra stuff you get
when you save as web page from Word 2000. It doesn't yet know what
to do with VML tags, but these will appear as errors unless you
declare them as new tags, such as o:p which needs to be declared
as inline.
*/
void CleanWord2000(Lexer *lexer, Node *node)
{
/* used to a list from a sequence of bulletted p's */
Node *list = null;
while (node)
{
/* get rid of Word's xmlns attributes */
if (node->tag == tag_html)
{
/* check that it's a Word 2000 document */
if (!GetAttrByName(node, "xmlns:o") && !MakeBare)
return;
FreeAttrs(node);
}
/* fix up preformatted sections by looking for a
** sequence of paragraphs with zero top/bottom margin
*/
if (node->tag == tag_p)
{
if (NoMargins(node))
{
Node *pre, *next;
CoerceNode(lexer, node, tag_pre);
PurgeWord2000Attributes(node);
if (node->content)
CleanWord2000(lexer, node->content);
pre = node;
node = node->next;
/* continue to strip p's */
while (node->tag == tag_p && NoMargins(node))
{
next = node->next;
RemoveNode(node);
InsertNodeAtEnd(pre, NewLineNode(lexer));
InsertNodeAtEnd(pre, node);
StripSpan(lexer, node);
node = next;
}
if (node == null)
break;
}
}
if (node->tag && (node->tag->model & CM_BLOCK)
&& SingleSpace(lexer, node))
{
node = StripSpan(lexer, node);
continue;
}
/* discard Word's style verbiage */
if (node->tag == tag_style || node->tag == tag_meta || node->type == CommentTag)
{
node = DiscardElement(node);
continue;
}
/* strip out all span and font tags Word scatters so liberally! */
if (node->tag == tag_span || node->tag == tag_font)
{
node = StripSpan(lexer, node);
continue;
}
if (node->tag == tag_link)
{
AttVal *attr = GetAttrByName(node, "rel");
if (attr && wstrcmp(attr->value, "File-List") == 0)
{
node = DiscardElement(node);
continue;
}
}
/* discard empty paragraphs */
if (node->content == null && node->tag == tag_p)
{
node = DiscardElement(node);
continue;
}
if (node->tag == tag_p)
{
AttVal *attr, *atrStyle;
attr = GetAttrByName(node, "class");
atrStyle = GetAttrByName(node, "style");
/*
(JES) Sometimes Word marks a list item with the following hokie syntax
<p class="MsoNormal" style="...;mso-list:l1 level1 lfo1;
translate these into <li>
*/
/* map sequence of <p class="MsoListBullet"> to <ul>...</ul> */
/* map <p class="MsoListNumber"> to <ol>...</ol> */
if ((attr &&
(wstrcmp(attr->value, "MsoListBullet") == 0 ||
wstrcmp(attr->value, "MsoListNumber") == 0 )) ||
(atrStyle && (strstr(atrStyle->value,"mso-list:") != null))) /* 463066 - fix by Joel Shafer 19 Sep 01 */
{
Dict* listType = tag_ul;
if ( wstrcmp(attr->value, "MsoListNumber") == 0 )
listType = tag_ol;
CoerceNode(lexer, node, tag_li);
if (!list || list->tag != listType)
{
list = InferredTag(lexer, listType->name);
InsertNodeBeforeElement(node, list);
}
PurgeWord2000Attributes(node);
if (node->content)
CleanWord2000(lexer, node->content);
/* remove node and append to contents of list */
RemoveNode(node);
InsertNodeAtEnd(list, node);
node = list;
}
/* map sequence of <p class="Code"> to <pre>...</pre> */
else if (attr && wstrcmp(attr->value, "Code") == 0)
{
Node *br = NewLineNode(lexer);
NormalizeSpaces(lexer, node);
if (!list || list->tag != tag_pre)
{
list = InferredTag(lexer, "pre");
InsertNodeBeforeElement(node, list);
}
/* remove node and append to contents of list */
RemoveNode(node);
InsertNodeAtEnd(list, node);
StripSpan(lexer, node);
InsertNodeAtEnd(list, br);
node = list->next;
}
else
list = null;
}
else
list = null;
/* strip out style and class attributes */
if (node->type == StartTag || node->type == StartEndTag)
PurgeWord2000Attributes(node);
if (node->content)
CleanWord2000(lexer, node->content);
node = node->next;
}
}
Bool IsWord2000(Node *root)
{
AttVal *attval;
Node *node, *head;
Node *html = FindHTML(root);
if (html && GetAttrByName(html, "xmlns:o"))
return yes;
/* search for <meta name="GENERATOR" content="Microsoft ..."> */
head = FindHEAD(root);
if (head)
{
for (node = head->content; node; node = node->next)
{
if (node->tag != tag_meta)
continue;
attval = GetAttrByName(node, "name");
if (attval == null || attval->value == null)
continue;
if (wstrcasecmp(attval->value, "generator") != 0)
continue;
attval = GetAttrByName(node, "content");
if (attval == null || attval->value == null)
continue;
if (wsubstr(attval->value, "Microsoft"))
return yes;
}
}
return no;
}
/* where appropriate move object elements from head to body */
void BumpObject(Lexer *lexer, Node *html)
{
Node *node, *next, *head = null, *body = null;
for (node = html->content; node != null; node = node->next)
{
if (node->tag == tag_head)
head = node;
if (node->tag == tag_body)
body = node;
}
if (head != null && body != null)
{
for (node = head->content; node != null; node = next)
{
next = node->next;
if (node->tag == tag_object)
{
Node *child;
Bool bump = no;
for (child = node->content; child != null; child = child->next)
{
/* bump to body unless content is param */
if ((child->type == TextNode && !IsBlank(lexer, node))
|| child->tag != tag_param)
{
bump = yes;
break;
}
}
if (bump)
{
RemoveNode(node);
InsertNodeAtStart(body, node);
}
}
}
}
}
|
