/*
** Copyright (c) 2007 D. Richard Hipp
**
** This program is free software; you can redistribute it and/or
** modify it under the terms of the GNU General Public
** License version 2 as published by the Free Software Foundation.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
** General Public License for more details.
**
** You should have received a copy of the GNU General Public
** License along with this library; if not, write to the
** Free Software Foundation, Inc., 59 Temple Place - Suite 330,
** Boston, MA 02111-1307, USA.
**
** Author contact information:
** drh@hwaci.com
** http://www.hwaci.com/drh/
**
*******************************************************************************
**
** This file contains code to do formatting of wiki text.
*/
#include <assert.h>
#include "config.h"
#include "wikiformat.h"
#if INTERFACE
/*
** Allowed wiki transformation operations
*/
#define WIKI_NOFOLLOW 0x001
#define WIKI_HTML 0x002
#endif
/*
** These are the only markup attributes allowed.
*/
#define ATTR_ALIGN 0x000001
#define ATTR_ALT 0x000002
#define ATTR_BGCOLOR 0x000004
#define ATTR_BORDER 0x000008
#define ATTR_CELLPADDING 0x000010
#define ATTR_CELLSPACING 0x000020
#define ATTR_CLEAR 0x000040
#define ATTR_COLOR 0x000080
#define ATTR_COLSPAN 0x000100
#define ATTR_COMPACT 0x000200
#define ATTR_FACE 0x000400
#define ATTR_HEIGHT 0x000800
#define ATTR_HREF 0x001000
#define ATTR_HSPACE 0x002000
#define ATTR_ID 0x004000
#define ATTR_ROWSPAN 0x008000
#define ATTR_SIZE 0x010000
#define ATTR_SRC 0x020000
#define ATTR_START 0x040000
#define ATTR_TYPE 0x080000
#define ATTR_VALIGN 0x100000
#define ATTR_VALUE 0x200000
#define ATTR_VSPACE 0x400000
#define ATTR_WIDTH 0x800000
static const struct AllowedAttribute {
const char *zName;
unsigned int iMask;
} aAttribute[] = {
{ "align", ATTR_ALIGN, },
{ "alt", ATTR_ALT, },
{ "bgcolor", ATTR_BGCOLOR, },
{ "border", ATTR_BORDER, },
{ "cellpadding", ATTR_CELLPADDING, },
{ "cellspacing", ATTR_CELLSPACING, },
{ "clear", ATTR_CLEAR, },
{ "color", ATTR_COLOR, },
{ "colspan", ATTR_COLSPAN, },
{ "compact", ATTR_COMPACT, },
{ "face", ATTR_FACE, },
{ "height", ATTR_HEIGHT, },
{ "href", ATTR_HREF, },
{ "hspace", ATTR_HSPACE, },
{ "id", ATTR_ID, },
{ "rowspan", ATTR_ROWSPAN, },
{ "size", ATTR_SIZE, },
{ "src", ATTR_SRC, },
{ "start", ATTR_START, },
{ "type", ATTR_TYPE, },
{ "valign", ATTR_VALIGN, },
{ "value", ATTR_VALUE, },
{ "vspace", ATTR_VSPACE, },
{ "width", ATTR_WIDTH, },
};
/*
** Use binary search to locate a tag in the aAttribute[] table.
*/
static int findAttr(const char *z){
int i, c, first, last;
first = 0;
last = sizeof(aAttribute)/sizeof(aAttribute[0]) - 1;
while( first<=last ){
i = (first+last)/2;
c = strcmp(aAttribute[i].zName, z);
if( c==0 ){
return aAttribute[i].iMask;
}else if( c<0 ){
first = i+1;
}else{
last = i-1;
}
}
return 0;
}
/*
** Allowed markup.
**
** Except for MARKUP_INVALID, this must all be in alphabetical order
** and in numerical sequence. The first markup type must be zero.
** The value for MARKUP_XYZ must correspond to the <xyz> entry
** in aAllowedMarkup[].
*/
#define MARKUP_INVALID 0
#define MARKUP_A 1
#define MARKUP_ADDRESS 2
#define MARKUP_B 3
#define MARKUP_BIG 4
#define MARKUP_BLOCKQUOTE 5
#define MARKUP_BR 6
#define MARKUP_CENTER 7
#define MARKUP_CITE 8
#define MARKUP_CODE 9
#define MARKUP_DD 10
#define MARKUP_DFN 11
#define MARKUP_DL 12
#define MARKUP_DT 13
#define MARKUP_EM 14
#define MARKUP_FONT 15
#define MARKUP_H1 16
#define MARKUP_H2 17
#define MARKUP_H3 18
#define MARKUP_H4 19
#define MARKUP_H5 20
#define MARKUP_H6 21
#define MARKUP_HR 22
#define MARKUP_IMG 23
#define MARKUP_I 24
#define MARKUP_KBD 25
#define MARKUP_LI 26
#define MARKUP_NOBR 27
#define MARKUP_NOWIKI 28
#define MARKUP_OL 29
#define MARKUP_P 30
#define MARKUP_PRE 31
#define MARKUP_S 32
#define MARKUP_SAMP 33
#define MARKUP_SMALL 34
#define MARKUP_STRIKE 35
#define MARKUP_STRONG 36
#define MARKUP_SUB 37
#define MARKUP_SUP 38
#define MARKUP_TABLE 39
#define MARKUP_TD 40
#define MARKUP_TH 41
#define MARKUP_TR 42
#define MARKUP_TT 43
#define MARKUP_U 44
#define MARKUP_UL 45
#define MARKUP_VAR 46
#define MARKUP_VERBATIM 47
/*
** The various markup is divided into the following types:
*/
#define MUTYPE_SINGLE 0x0001 /* <img>, <br>, or <hr> */
#define MUTYPE_BLOCK 0x0002 /* Forms a new paragraph. ex: <p>, <h2> */
#define MUTYPE_FONT 0x0004 /* Font changes. ex: <b>, <font>, <sub> */
#define MUTYPE_LINK 0x0008 /* Hyperlink: <a> */
#define MUTYPE_LIST 0x0010 /* Lists. <ol>, <ul>, or <dl> */
#define MUTYPE_LI 0x0020 /* List items. <li>, <dd>, <dt> */
#define MUTYPE_TABLE 0x0040 /* <table> */
#define MUTYPE_TR 0x0080 /* <tr> */
#define MUTYPE_TD 0x0100 /* <td> or <th> */
#define MUTYPE_SPECIAL 0x0200 /* <nowiki> or <verbatim> */
#define MUTYPE_HYPERLINK 0x0400 /* <a> */
#define MUTYPE_STACK (MUTYPE_BLOCK | MUTYPE_FONT | MUTYPE_LIST | MUTYPE_TABLE)
static const struct AllowedMarkup {
const char *zName; /* Name of the markup */
char iCode; /* The MARKUP_* code */
short int iType; /* The MUTYPE_* code */
int allowedAttr; /* Allowed attributes on this markup */
} aMarkup[] = {
{ 0, MARKUP_INVALID, 0, 0 },
{ "a", MARKUP_A, MUTYPE_HYPERLINK, ATTR_HREF },
{ "address", MARKUP_ADDRESS, MUTYPE_BLOCK, 0 },
{ "b", MARKUP_B, MUTYPE_FONT, 0 },
{ "big", MARKUP_BIG, MUTYPE_FONT, 0 },
{ "blockquote", MARKUP_BLOCKQUOTE, MUTYPE_BLOCK, 0 },
{ "br", MARKUP_BR, MUTYPE_SINGLE, ATTR_CLEAR },
{ "center", MARKUP_CENTER, MUTYPE_BLOCK, 0 },
{ "cite", MARKUP_CITE, MUTYPE_FONT, 0 },
{ "code", MARKUP_CODE, MUTYPE_FONT, 0 },
{ "dd", MARKUP_DD, MUTYPE_LI, 0 },
{ "dfn", MARKUP_DFN, MUTYPE_FONT, 0 },
{ "dl", MARKUP_DL, MUTYPE_LIST, ATTR_COMPACT },
{ "dt", MARKUP_DT, MUTYPE_LI, 0 },
{ "em", MARKUP_EM, MUTYPE_FONT, 0 },
{ "font", MARKUP_FONT, MUTYPE_FONT,
ATTR_COLOR|ATTR_FACE|ATTR_SIZE },
{ "h1", MARKUP_H1, MUTYPE_BLOCK, ATTR_ALIGN },
{ "h2", MARKUP_H2, MUTYPE_BLOCK, ATTR_ALIGN },
{ "h3", MARKUP_H3, MUTYPE_BLOCK, ATTR_ALIGN },
{ "h4", MARKUP_H4, MUTYPE_BLOCK, ATTR_ALIGN },
{ "h5", MARKUP_H5, MUTYPE_BLOCK, ATTR_ALIGN },
{ "h6", MARKUP_H6, MUTYPE_BLOCK, ATTR_ALIGN },
{ "hr", MARKUP_HR, MUTYPE_SINGLE,
ATTR_ALIGN|ATTR_COLOR|ATTR_SIZE|ATTR_WIDTH },
{ "img", MARKUP_IMG, MUTYPE_SINGLE,
ATTR_ALIGN|ATTR_ALT|ATTR_BORDER|ATTR_HEIGHT|
ATTR_HSPACE|ATTR_SRC|ATTR_VSPACE|ATTR_WIDTH },
{ "i", MARKUP_I, MUTYPE_FONT, 0 },
{ "kbd", MARKUP_KBD, MUTYPE_FONT, 0 },
{ "li", MARKUP_LI, MUTYPE_LI,
ATTR_TYPE|ATTR_VALUE },
{ "nobr", MARKUP_NOBR, MUTYPE_FONT, 0 },
{ "nowiki", MARKUP_NOWIKI, MUTYPE_SPECIAL, 0 },
{ "ol", MARKUP_OL, MUTYPE_LIST,
ATTR_START|ATTR_TYPE|ATTR_COMPACT },
{ "p", MARKUP_P, MUTYPE_BLOCK, ATTR_ALIGN },
{ "pre", MARKUP_PRE, MUTYPE_BLOCK, 0 },
{ "s", MARKUP_S, MUTYPE_FONT, 0 },
{ "samp", MARKUP_SAMP, MUTYPE_FONT, 0 },
{ "small", MARKUP_SMALL, MUTYPE_FONT, 0 },
{ "strike", MARKUP_STRIKE, MUTYPE_FONT, 0 },
{ "strong", MARKUP_STRONG, MUTYPE_FONT, 0 },
{ "sub", MARKUP_SUB, MUTYPE_FONT, 0 },
{ "sup", MARKUP_SUP, MUTYPE_FONT, 0 },
{ "table", MARKUP_TABLE, MUTYPE_TABLE,
ATTR_ALIGN|ATTR_BGCOLOR|ATTR_BORDER|ATTR_CELLPADDING|
ATTR_CELLSPACING|ATTR_HSPACE|ATTR_VSPACE },
{ "td", MARKUP_TD, MUTYPE_TD,
ATTR_ALIGN|ATTR_BGCOLOR|ATTR_COLSPAN|
ATTR_ROWSPAN|ATTR_VALIGN },
{ "th", MARKUP_TH, MUTYPE_TD,
ATTR_ALIGN|ATTR_BGCOLOR|ATTR_COLSPAN|
ATTR_ROWSPAN|ATTR_VALIGN },
{ "tr", MARKUP_TR, MUTYPE_TR,
ATTR_ALIGN|ATTR_BGCOLOR||ATTR_VALIGN },
{ "tt", MARKUP_TT, MUTYPE_FONT, 0 },
{ "u", MARKUP_U, MUTYPE_FONT, 0 },
{ "ul", MARKUP_UL, MUTYPE_LIST,
ATTR_TYPE|ATTR_COMPACT },
{ "var", MARKUP_VAR, MUTYPE_FONT, 0 },
{ "verbatim", MARKUP_VERBATIM, MUTYPE_SPECIAL, ATTR_ID },
};
/*
** Use binary search to locate a tag in the aMarkup[] table.
*/
static int findTag(const char *z){
int i, c, first, last;
first = 1;
last = sizeof(aMarkup)/sizeof(aMarkup[0]) - 1;
while( first<=last ){
i = (first+last)/2;
c = strcmp(aMarkup[i].zName, z);
if( c==0 ){
assert( aMarkup[i].iCode==i );
return i;
}else if( c<0 ){
first = i+1;
}else{
last = i-1;
}
}
return MARKUP_INVALID;
}
/*
** Token types
*/
#define TOKEN_MARKUP 1 /* <...> */
#define TOKEN_CHARACTER 2 /* "&" or "<" not part of markup */
#define TOKEN_LINK 3 /* [...] */
#define TOKEN_PARAGRAPH 4 /* blank lines */
#define TOKEN_NEWLINE 5 /* A single "\n" */
#define TOKEN_BULLET 6 /* " * " */
#define TOKEN_ENUM 7 /* " \(?\d+[.)]? " */
#define TOKEN_INDENT 8 /* " " */
#define TOKEN_TEXT 9 /* None of the above */
/*
** State flags
*/
#define AT_NEWLINE 0x001 /* At start of a line */
#define AT_PARAGRAPH 0x002 /* At start of a paragraph */
#define ALLOW_WIKI 0x004 /* Allow wiki markup */
#define FONT_MARKUP_ONLY 0x008 /* Only allow MUTYPE_FONT markup */
#define IN_LIST 0x010 /* Within wiki <ul> or <ol> */
/*
** Current state of the rendering engine
*/
typedef struct Renderer Renderer;
struct Renderer {
Blob *pOut; /* Output appended to this blob */
int state; /* Flag that govern rendering */
int wikiList; /* Current wiki list type */
int inVerbatim; /* True in <verbatim> mode */
int preVerbState; /* Value of state prior to verbatim */
const char *zVerbatimId; /* The id= attribute of <verbatim> */
int nStack; /* Number of elements on the stack */
int nAlloc; /* Space allocated for aStack */
unsigned char *aStack; /* Open markup stack */
};
/*
** z points to a "<" character. Check to see if this is the start of
** a valid markup. If it is, return the total number of characters in
** the markup including the initial "<" and the terminating ">". If
** it is not well-formed markup, return 0.
*/
static int markupLength(const char *z){
int n = 1;
int inparen = 0;
if( z[n]=='/' ){ n++; }
if( !isalpha(z[n]) ) return 0;
while( isalnum(z[n]) ){ n++; }
if( z[n]!='>' && !isspace(z[n]) ) return 0;
while( z[n] && (z[n]!='>' || inparen) ){
if( z[n]=='"' ){
inparen = !inparen;
}
n++;
}
if( z[n]!='>' ) return 0;
return n+1;
}
/*
** z points to a "\n" character. Check to see if this newline is
** followed by one or more blank lines. If it is, return the number
** of characters through the closing "\n". If not, return 0.
*/
static int paragraphBreakLength(const char *z){
int i, n;
int nNewline = 1;
for(i=1, n=0; isspace(z[i]); i++){
if( z[i]=='\n' ){
nNewline++;
n = i;
}
}
if( nNewline>=2 ){
return n+1;
}else{
return 0;
}
}
/*
** Return the number of characters until the next "interesting"
** characters.
**
** Interesting characters are:
**
** <
** &
** \n
** [
**
** The "[" and "\n" are only considered interesting if the "useWiki"
** flag is set.
*/
static int textLength(const char *z, int useWiki){
int n = 0;
int c;
while( (c = z[0])!=0 && c!='<' && c!='&' &&
(useWiki==0 || (c!='[' && c!='\n')) ){
n++;
z++;
}
return n;
}
/*
** Return true if z[] begins with an HTML character element.
*/
static int isElement(const char *z){
int i;
assert( z[0]=='&' );
if( z[1]=='#' ){
for(i=2; isdigit(z[i]); i++){}
return i>2 && z[i]==';';
}else{
for(i=1; isalpha(z[i]); i++){}
return i>1 && z[i]==';';
}
}
/*
** Check to see if the z[] string is the beginning of a wiki bullet.
** If it is, return the length of the bullet text. Otherwise return 0.
*/
static int bulletLength(const char *z){
int i, n;
n = 0;
i = 0;
while( z[n]==' ' || z[n]=='\t' ){
if( z[n]=='\t' ) i++;
i++;
n++;
}
if( i<2 || z[n]!='*' ) return 0;
n++;
i = 0;
while( z[n]==' ' || z[n]=='\t' ){
if( z[n]=='\t' ) i++;
i++;
n++;
}
if( i<2 || isspace(z[n]) ) return 0;
return n;
}
/*
** Check to see if the z[] string is the beginning of a enumeration value.
** If it is, return the length of the bullet text. Otherwise return 0.
**
** Syntax:
** * a tab or two or more spaces
** * one or more digits
** * optional "."
** * another tab or two or more additional spaces
**
*/
static int enumLength(const char *z){
int i, n;
n = 0;
i = 0;
while( z[n]==' ' || z[n]=='\t' ){
if( z[n]=='\t' ) i++;
i++;
n++;
}
if( i<2 ) return 0;
for(i=0; isdigit(z[n]); i++, n++){}
if( i==0 ) return 0;
if( z[n]=='.' ){
n++;
}
i = 0;
while( z[n]==' ' || z[n]=='\t' ){
if( z[n]=='\t' ) i++;
i++;
n++;
}
if( i<2 || isspace(z[n]) ) return 0;
return n;
}
/*
** Check to see if the z[] string is the beginning of an indented
** paragraph. If it is, return the length of the indent. Otherwise
** return 0.
*/
static int indentLength(const char *z){
int i, n;
n = 0;
i = 0;
while( z[n]==' ' || z[n]=='\t' ){
if( z[n]=='\t' ) i++;
i++;
n++;
}
if( i<2 || isspace(z[n]) ) return 0;
return n;
}
/*
** Check to see if the z[] string is a wiki hyperlink. If it is,
** return the length of the hyperlink. Otherwise return 0.
*/
static int linkLength(const char *z){
int n;
assert( z[0]=='[' );
for(n=0; z[n] && z[n]!=']'; n++){}
if( z[n]==']' ){
return n+1;
}else{
return 0;
}
}
/*
** z points to the start of a token. Return the number of
** characters in that token. Write the token type into *pTokenType.
*/
static int nextToken(const char *z, int state, int *pTokenType){
int n;
if( z[0]=='<' ){
n = markupLength(z);
if( n>0 ){
*pTokenType = TOKEN_MARKUP;
return n;
}else{
*pTokenType = TOKEN_CHARACTER;
return 1;
}
}
if( z[0]=='&' && !isElement(z) ){
*pTokenType = TOKEN_CHARACTER;
return 1;
}
if( (state & ALLOW_WIKI)!=0 ){
if( z[0]=='\n' ){
n = paragraphBreakLength(z);
if( n>0 ){
*pTokenType = TOKEN_PARAGRAPH;
return n;
}else if( isspace(z[1]) ){
*pTokenType = TOKEN_NEWLINE;
return 1;
}
}
if( (state & AT_NEWLINE)!=0 /* && (state & (AT_PARAGRAPH|IN_LIST))!=0 */
&& isspace(z[0]) ){
n = bulletLength(z);
if( n>0 ){
*pTokenType = TOKEN_BULLET;
return n;
}
n = enumLength(z);
if( n>0 ){
*pTokenType = TOKEN_ENUM;
return n;
}
}
if( (state & AT_PARAGRAPH)!=0 && isspace(z[0]) ){
n = indentLength(z);
if( n>0 ){
*pTokenType = TOKEN_INDENT;
return n;
}
}
if( z[0]=='[' && (n = linkLength(z))>0 ){
*pTokenType = TOKEN_LINK;
return n;
}
}
*pTokenType = TOKEN_TEXT;
return 1 + textLength(z+1, state & ALLOW_WIKI);
}
/*
** A single markup is parsed into an instance of the following
** structure.
*/
typedef struct ParsedMarkup ParsedMarkup;
struct ParsedMarkup {
unsigned char endTag; /* True if </...> instead of <...> */
unsigned char iCode; /* MARKUP_* */
unsigned char nAttr; /* Number of attributes */
unsigned short iType; /* MUTYPE_* */
struct {
unsigned char iCode; /* ATTR_* */
char *zValue; /* Argument to this attribute. Might be NULL */
char cTerm; /* Original argument termination character */
} aAttr[10];
};
/*
** z[] is an HTML markup element - something that begins with '<'.
** Parse this element into the p structure.
**
** The content of z[] might be modified by converting characters
** to lowercase and by inserting some "\000" characters.
*/
static void parseMarkup(ParsedMarkup *p, char *z){
int i, c;
char *zTag, *zValue;
int seen = 0;
if( z[1]=='/' ){
p->endTag = 1;
i = 2;
}else{
p->endTag = 0;
i = 1;
}
zTag = &z[i];
while( isalnum(z[i]) ){
z[i] = tolower(z[i]);
i++;
}
c = z[i];
z[i] = 0;
p->iCode = findTag(zTag);
p->iType = aMarkup[p->iCode].iType;
p->nAttr = 0;
z[i] = c;
while( isspace(z[i]) ){ i++; }
while( p->nAttr<8 && isalpha(z[i]) ){
zTag = &z[i];
while( isalnum(z[i]) ){
z[i] = tolower(z[i]);
i++;
}
c = z[i];
z[i] = 0;
p->aAttr[p->nAttr].iCode = findAttr(zTag);
z[i] = c;
while( isspace(z[i]) ){ z++; }
if( z[i]!='=' ){
p->aAttr[p->nAttr].zValue = 0;
p->aAttr[p->nAttr].cTerm = 0;
c = 0;
}else{
i++;
while( isspace(z[i]) ){ z++; }
if( z[i]=='"' ){
i++;
zValue = &z[i];
while( z[i] && z[i]!='"' ){ i++; }
}else{
zValue = &z[i];
while( !isspace(z[i]) && z[i]!='>' ){ z++; }
}
p->aAttr[p->nAttr].zValue = zValue;
p->aAttr[p->nAttr].cTerm = c = z[i];
z[i] = 0;
i++;
}
if( p->aAttr[p->nAttr].iCode!=0 && (seen & p->aAttr[p->nAttr].iCode)==0 ){
seen |= p->aAttr[p->nAttr].iCode;
p->nAttr++;
}
if( c=='>' ) break;
}
}
/*
** Render markup on the given blob.
*/
static void renderMarkup(Blob *pOut, ParsedMarkup *p){
int i;
if( p->endTag ){
blob_appendf(pOut, "</%s>", aMarkup[p->iCode].zName);
}else{
blob_appendf(pOut, "<%s", aMarkup[p->iCode].zName);
for(i=0; i<p->nAttr; i++){
blob_appendf(pOut, " %s", aAttribute[p->aAttr[i].iCode]);
if( p->aAttr[i].zValue ){
blob_appendf(pOut, "=\"%s\"", p->aAttr[i].zValue);
}
}
blob_append(pOut, ">", 1);
}
}
/*
** When the markup was parsed, some "\000" may have been inserted.
** This routine restores to those "\000" values back to their
** original content.
*/
static void unparseMarkup(ParsedMarkup *p){
int i, n;
for(i=0; i<p->nAttr; i++){
char *z = p->aAttr[i].zValue;
if( z==0 ) continue;
n = strlen(z);
z[n] = p->aAttr[i].cTerm;
}
}
/*
** Pop a single element off of the stack. As the element is popped,
** output its end tag.
*/
static void popStack(Renderer *p){
if( p->nStack ){
p->nStack--;
blob_appendf(p->pOut, "</%s>", aMarkup[p->aStack[p->nStack]].zName);
}
}
/*
** Push a new markup value onto the stack. Enlarge the stack
** if necessary.
*/
static void pushStack(Renderer *p, int elem){
if( p->nStack>=p->nAlloc ){
p->nAlloc = p->nAlloc*2 + 100;
p->aStack = realloc(p->aStack, p->nAlloc);
if( p->aStack==0 ){
fossil_panic("out of memory");
}
}
p->aStack[p->nStack++] = elem;
}
/*
** Pop the stack until the top-most iTag element is removed.
** If there is no iTag element on the stack, this routine
** is a no-op.
*/
static void popStackToTag(Renderer *p, int iTag){
int i;
for(i=p->nStack-1; i>=0 && p->aStack[i]!=iTag; i--){}
if( i<0 ) return;
while( p->nStack>i ){
popStack(p);
}
}
/*
** Pop the stack until the top-most element of the stack
** is an element that matches the type in iMask. Return
** code of the markup element that is on left on top of the stack.
** If the stack does not have an element
** that matches iMask, then leave the stack unchanged and
** return false (MARKUP_INVALID).
*/
static int backupToType(Renderer *p, int iMask){
int i;
for(i=p->nStack-1; i>=0 && (aMarkup[p->aStack[i]].iType&iMask)==0; i--){}
if( i<0 ) return 0;
i++;
while( p->nStack>i ){
popStack(p);
}
return p->aStack[i-1];
}
/*
** Add missing markup in preparation for writing text.
**
** "Missing" markup are things like start tags for table rows
** or table columns or paragraphs that are omitted from input.
*/
static void addMissingMarkup(Renderer *p){
/* TBD */
}
/*
** Resolve a hyperlink. The argument is the content of the [...]
** in the wiki. Append the URL to the output of the Renderer.
*/
static void resolveHyperlink(const char *zTarget, Renderer *p){
if( strncmp(zTarget, "http:", 5)==0
|| strncmp(zTarget, "https:", 6)==0
|| strncmp(zTarget, "ftp:", 4)==0
|| strncmp(zTarget, "mailto:", 7)==0
){
blob_appendf(p->pOut, zTarget);
}else if( wiki_name_is_wellformed(zTarget) ){
blob_appendf(p->pOut, "%s/wiki/%T", g.zBaseURL, zTarget);
}else{
blob_appendf(p->pOut, "error");
}
}
/*
** Check to see if the given parsed markup is the correct
** </verbatim> tag.
*/
static int endVerbatim(Renderer *p, ParsedMarkup *pMarkup){
char *z;
assert( p->inVerbatim );
if( pMarkup->iCode!=MARKUP_VERBATIM ) return 0;
if( !pMarkup->endTag ) return 0;
if( p->zVerbatimId==0 ) return 1;
if( pMarkup->nAttr!=1 ) return 0;
z = pMarkup->aAttr[0].zValue;
return strcmp(z, p->zVerbatimId)==0;
}
/*
** Return the MUTYPE for the top of the stack.
*/
static int stackTopType(Renderer *p){
if( p->nStack<=0 ) return 0;
return aMarkup[p->aStack[p->nStack-1]].iType;
}
/*
** Convert the wiki in z[] into html in the renderer p. The
** renderer has already been initialized.
**
** This routine will probably modify the content of z[].
*/
static void wiki_render(Renderer *p, char *z){
int tokenType;
ParsedMarkup markup;
int n;
while( z[0] ){
n = nextToken(z, p->state, &tokenType);
p->state &= ~(AT_NEWLINE|AT_PARAGRAPH);
switch( tokenType ){
case TOKEN_PARAGRAPH: {
if( p->wikiList ){
popStackToTag(p, p->wikiList);
p->wikiList = 0;
}
blob_append(p->pOut, "\n\n<p>", -1);
p->state |= AT_PARAGRAPH|AT_NEWLINE;
popStackToTag(p, MARKUP_P);
break;
}
case TOKEN_NEWLINE: {
blob_append(p->pOut, "\n", 1);
p->state |= AT_NEWLINE;
break;
}
case TOKEN_BULLET: {
if( p->wikiList!=MARKUP_UL ){
if( p->wikiList ){
popStackToTag(p, p->wikiList);
}
pushStack(p, MARKUP_UL);
blob_append(p->pOut, "<ul>", 4);
p->wikiList = MARKUP_UL;
}
pushStack(p, MARKUP_LI);
blob_append(p->pOut, "<li>", 4);
break;
}
case TOKEN_ENUM: {
if( p->wikiList!=MARKUP_OL ){
if( p->wikiList ){
popStackToTag(p, p->wikiList);
}
pushStack(p, MARKUP_OL);
blob_append(p->pOut, "<ol>", 4);
p->wikiList = MARKUP_OL;
}
pushStack(p, MARKUP_LI);
blob_appendf(p->pOut, "<li value=\"%d\">", atoi(z));
break;
}
case TOKEN_INDENT: {
assert( p->wikiList==0 );
pushStack(p, MARKUP_BLOCKQUOTE);
blob_append(p->pOut, "<blockquote>", -1);
p->wikiList = MARKUP_BLOCKQUOTE;
break;
}
case TOKEN_CHARACTER: {
if( z[0]=='<' ){
blob_append(p->pOut, "<", 4);
}else if( z[0]=='&' ){
blob_append(p->pOut, "&", 5);
}
break;
}
case TOKEN_LINK: {
char *zTarget;
char *zDisplay = 0;
int i, j;
int savedState;
addMissingMarkup(p);
zTarget = &z[1];
for(i=1; z[i] && z[i]!=']'; i++){
if( z[i]=='|' && zDisplay==0 ){
zDisplay = &z[i+1];
z[i] = 0;
for(j=i-1; j>0 && isspace(z[j]); j--){ z[j] = 0; }
}
}
z[i] = 0;
if( zDisplay==0 ){
zDisplay = zTarget;
}else{
while( isspace(*zDisplay) ) zDisplay++;
}
blob_append(p->pOut, "<a href=\"", -1);
resolveHyperlink(zTarget, p);
blob_append(p->pOut, "\">", -1);
savedState = p->state;
p->state &= ~ALLOW_WIKI;
p->state |= FONT_MARKUP_ONLY;
wiki_render(p, zDisplay);
p->state = savedState;
blob_append(p->pOut, "</a>", 4);
break;
}
case TOKEN_TEXT: {
addMissingMarkup(p);
blob_append(p->pOut, z, n);
break;
}
case TOKEN_MARKUP: {
parseMarkup(&markup, z);
if( p->inVerbatim ){
if( endVerbatim(p, &markup) ){
p->inVerbatim = 0;
p->state = p->preVerbState;
blob_append(p->pOut, "</pre>", 6);
}else{
unparseMarkup(&markup);
blob_append(p->pOut, "<", 4);
n = 1;
}
}else if( markup.iCode==MARKUP_INVALID ){
blob_append(p->pOut, "<", 4);
n = 1;
}else if( (markup.iType&MUTYPE_FONT)==0
&& (p->state & FONT_MARKUP_ONLY)!=0 ){
/* Do nothing */
}else if( markup.iCode==MARKUP_NOWIKI ){
if( markup.endTag ){
p->state |= ALLOW_WIKI;
}else{
p->state &= ALLOW_WIKI;
}
}else if( markup.endTag ){
popStackToTag(p, markup.iCode);
}else if( markup.iCode==MARKUP_VERBATIM ){
if( markup.nAttr==1 ){
p->zVerbatimId = markup.aAttr[0].zValue;
}else{
p->zVerbatimId = 0;
}
p->inVerbatim = 1;
p->preVerbState = p->state;
p->state &= ~ALLOW_WIKI;
blob_append(p->pOut, "<pre>", 5);
}else if( markup.iType==MUTYPE_LI ){
if( backupToType(p, MUTYPE_LIST)==0 ){
pushStack(p, MARKUP_UL);
blob_append(p->pOut, "<ul>", 4);
}
pushStack(p, MARKUP_LI);
renderMarkup(p->pOut, &markup);
}else if( markup.iType==MUTYPE_TR ){
if( backupToType(p, MUTYPE_TABLE) ){
pushStack(p, MARKUP_TR);
renderMarkup(p->pOut, &markup);
}
}else if( markup.iType==MUTYPE_TD ){
if( backupToType(p, MUTYPE_TABLE|MUTYPE_TR) ){
if( stackTopType(p)==MUTYPE_TABLE ){
pushStack(p, MARKUP_TR);
blob_append(p->pOut, "<tr>", 4);
}
pushStack(p, markup.iCode);
renderMarkup(p->pOut, &markup);
}
}else{
if( (markup.iType & MUTYPE_STACK )!=0 ){
pushStack(p, markup.iCode);
}
renderMarkup(p->pOut, &markup);
}
break;
}
}
z += n;
}
}
/*
** Transform the text in the pIn blob. Write the results
** into the pOut blob. The pOut blob should already be
** initialized. The output is merely appended to pOut.
** If pOut is NULL, then the output is appended to the CGI
** reply.
*/
void wiki_convert(Blob *pIn, Blob *pOut){
char *z;
Renderer renderer;
memset(&renderer, 0, sizeof(renderer));
renderer.state = ALLOW_WIKI|AT_NEWLINE|AT_PARAGRAPH;
if( pOut ){
renderer.pOut = pOut;
}else{
renderer.pOut = cgi_output_blob();
}
z = blob_str(pIn);
wiki_render(&renderer, z);
while( renderer.nStack ){
popStack(&renderer);
}
blob_append(renderer.pOut, "\n", 1);
free(renderer.aStack);
}
/*
** COMMAND: test-wiki-render
*/
void test_wiki_render(void){
Blob in, out;
if( g.argc!=3 ) usage("FILE");
blob_zero(&out);
blob_read_from_file(&in, g.argv[2]);
wiki_convert(&in, &out);
blob_write_to_file(&out, "-");
}