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fltk/src/Fl_Help_View.cxx
Greg Ercolano 1e6ac9c9bb Fix issue #871 for html causing crashes
2023-12-18 11:32:34 -08:00

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//
// Fl_Help_View widget for the Fast Light Tool Kit (FLTK).
//
// Copyright 1997-2010 by Easy Software Products.
// Image support by Matthias Melcher, Copyright 2000-2009.
//
// Buffer management (HV_Edit_Buffer) and more by AlbrechtS and others.
// Copyright 2011-2023 by Bill Spitzak and others.
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file. If this
// file is missing or damaged, see the license at:
//
// https://www.fltk.org/COPYING.php
//
// Please see the following page on how to report bugs and issues:
//
// https://www.fltk.org/bugs.php
//
// Contents:
//
// Fl_Help_View::add_block() - Add a text block to the list.
// Fl_Help_View::add_link() - Add a new link to the list.
// Fl_Help_View::add_target() - Add a new target to the list.
// Fl_Help_View::compare_targets() - Compare two targets.
// Fl_Help_View::do_align() - Compute the alignment for a line in a block.
// Fl_Help_View::draw() - Draw the Fl_Help_View widget.
// Fl_Help_View::format() - Format the help text.
// Fl_Help_View::format_table() - Format a table...
// Fl_Help_View::free_data() - Free memory used for the document.
// Fl_Help_View::get_align() - Get an alignment attribute.
// Fl_Help_View::get_attr() - Get an attribute value from the string.
// Fl_Help_View::get_color() - Get an alignment attribute.
// Fl_Help_View::handle() - Handle events in the widget.
// Fl_Help_View::Fl_Help_View() - Build a Fl_Help_View widget.
// Fl_Help_View::~Fl_Help_View() - Destroy a Fl_Help_View widget.
// Fl_Help_View::load() - Load the specified file.
// Fl_Help_View::resize() - Resize the help widget.
// Fl_Help_View::topline() - Set the top line to the named target.
// Fl_Help_View::topline() - Set the top line by number.
// Fl_Help_View::value() - Set the help text directly.
// scrollbar_callback() - A callback for the scrollbar.
//
//
// Include necessary header files...
//
#include <FL/Fl_Help_View.H>
#include <FL/Fl_Shared_Image.H>
#include <FL/Fl_Window.H>
#include <FL/Fl_Pixmap.H>
#include "Fl_Int_Vector.H"
#include "Fl_String.H"
#include <stdio.h>
#include <stdlib.h>
#include <FL/fl_utf8.h>
#include <FL/filename.H> // fl_open_uri()
#include <FL/fl_string_functions.h> // fl_strdup()
#include "flstring.h"
#include <ctype.h>
#include <errno.h>
#include <math.h>
#define MAX_COLUMNS 200
//
// Typedef the C API sort function type the only way I know how...
//
extern "C"
{
typedef int (*compare_func_t)(const void *, const void *);
}
//
// Local functions...
//
static int quote_char(const char *);
static void scrollbar_callback(Fl_Widget *s, void *);
static void hscrollbar_callback(Fl_Widget *s, void *);
//
// global flag for image loading (see get_image).
//
static char initial_load = 0;
//
// Broken image...
//
static const char * const broken_xpm[] =
{
"16 24 4 1",
"@ c #000000",
" c #ffffff",
"+ c none",
"x c #ff0000",
// pixels
"@@@@@@@+++++++++",
"@ @++++++++++",
"@ @+++++++++++",
"@ @++@++++++++",
"@ @@+++++++++",
"@ @+++@+++++",
"@ @++@@++++@",
"@ xxx @@ @++@@",
"@ xxx xx@@ @",
"@ xxx xxx @",
"@ xxxxxx @",
"@ xxxx @",
"@ xxxxxx @",
"@ xxx xxx @",
"@ xxx xxx @",
"@ xxx xxx @",
"@ @",
"@ @",
"@ @",
"@ @",
"@ @",
"@ @",
"@ @",
"@@@@@@@@@@@@@@@@",
NULL
};
static Fl_Pixmap broken_image(broken_xpm);
//
// Simple margin stack for Fl_Help_View::format()...
//
struct fl_margins {
int depth_;
int margins_[100];
fl_margins() { clear(); }
int clear() {
// puts("fl_margins::clear()");
depth_ = 0;
return margins_[0] = 4;
}
int current() { return margins_[depth_]; }
int pop() {
// printf("fl_margins::pop(): depth_=%d, xx=%d\n", depth_,
// depth_ > 0 ? margins_[depth_ - 1] : 4);
if (depth_ > 0) {
depth_ --;
return margins_[depth_];
} else return 4;
}
int push(int indent) {
int xx;
xx = margins_[depth_] + indent;
// printf("fl_margins::push(indent=%d): depth_=%d, xx=%d\n", indent,
// depth_ + 1, xx);
if (depth_ < 99) {
depth_ ++;
margins_[depth_] = xx;
}
return xx;
}
};
//
// All the stuff needed to implement text selection in Fl_Help_View
//
/* matt:
* We are trying to keep binary compatibility with previous versions
* of FLTK. This means that we are limited to adding static variables
* only to not enlarge the Fl_Help_View class. Lucky for us, only one
* text can be selected system wide, so we can remember the selection
* in a single set of variables.
*
* Still to do:
* - &word; style characters mess up our count inside a word boundary
* - we can only select words, no individual characters
* - no dragging of the selection into another widget
* - selection must be cleared if another widget get focus!
* - write a comment for every new function
*/
/*
The following functions are also used to draw stuff and should be replaced with
local copies that are much faster when merely counting:
fl_color(Fl_Color);
fl_rectf(int, int, int, int);
fl_push_clip(int, int, int, int);
fl_xyline(int, int, int);
fl_rect()
fl_line()
img->draw()
*/
// We don't put the offscreen buffer in the help view class because
// we'd need to include platform.H in the header...
static Fl_Offscreen fl_help_view_buffer;
int Fl_Help_View::selection_first = 0;
int Fl_Help_View::selection_last = 0;
int Fl_Help_View::selection_push_first = 0;
int Fl_Help_View::selection_push_last = 0;
int Fl_Help_View::selection_drag_first = 0;
int Fl_Help_View::selection_drag_last = 0;
int Fl_Help_View::selected = 0;
int Fl_Help_View::draw_mode = 0;
int Fl_Help_View::mouse_x = 0;
int Fl_Help_View::mouse_y = 0;
int Fl_Help_View::current_pos = 0;
Fl_Help_View *Fl_Help_View::current_view = 0L;
Fl_Color Fl_Help_View::hv_selection_color;
Fl_Color Fl_Help_View::hv_selection_text_color;
/*
* This function must be optimized for speed!
*/
void Fl_Help_View::hv_draw(const char *t, int x, int y, int entity_extra_length)
{
if (selected && current_view==this && current_pos<selection_last && current_pos>=selection_first) {
Fl_Color c = fl_color();
fl_color(hv_selection_color);
int w = (int)fl_width(t);
if (current_pos+(int)strlen(t)<selection_last)
w += (int)fl_width(' ');
fl_rectf(x, y+fl_descent()-fl_height(), w, fl_height());
fl_color(hv_selection_text_color);
fl_draw(t, x, y);
fl_color(c);
} else {
fl_draw(t, x, y);
}
if (draw_mode) {
int w = (int)fl_width(t);
if (mouse_x>=x && mouse_x<x+w) {
if (mouse_y>=y-fl_height()+fl_descent()&&mouse_y<=y+fl_descent()) {
int f = (int) current_pos;
int l = (int) (f+strlen(t)); // use 'quote_char' to calculate the true length of the HTML string
if (draw_mode==1) {
selection_push_first = f;
selection_push_last = l;
} else {
selection_drag_first = f;
selection_drag_last = l + entity_extra_length;
}
}
}
}
}
// [Internal class HV_Edit_Buffer]
// Debug: set to 1 for basic debugging, 2 for more, 0 for none
#define DEBUG_EDIT_BUFFER 0
#if (DEBUG_EDIT_BUFFER > 1)
#define DEBUG_FUNCTION(L,F) \
printf("\n========\n [%d] --- %s\n========\n", L, F); \
fflush(stdout);
#else
#define DEBUG_FUNCTION(L,F)
#endif
/* Note: Don't use Doxygen docs for this internal class.
Internal class to manage the Fl_Help_View edit buffer.
This is a subclass of Fl_String since FLTK 1.4.0.
This class is for internal use in this file. Its sole purpose is to
allow buffer management to avoid buffer overflows in stack variables
used to edit strings for formatting and drawing (STR #3275).
*/
class HV_Edit_Buffer : public Fl_String {
public:
// use default constructor and destructor, none defined here
// append a Unicode character (Code Point) to the string
void add(int ucs);
// case insensitive comparison of buffer contents with a string
int cmp(const char *str) {
return !strcasecmp(c_str(), str);
}
// string width of the entire buffer contents
int width() {
return (int)fl_width(c_str());
}
#if (DEBUG_EDIT_BUFFER)
void print(const char *text = "");
#endif
};
/*
Append one Unicode character (code point) to the buffer.
The Unicode character \p ucs is converted to UTF-8 and appended to
the buffer.
\param[in] ucs Unicode character (code point) to be added
*/
void HV_Edit_Buffer::add(int ucs) {
int len;
char cbuf[6];
len = fl_utf8encode((unsigned int)ucs, cbuf);
if (len < 1) len = 1;
append(cbuf, len);
} // add(int ucs)
/*
Print the edit buffer (Debug only).
*/
#if (DEBUG_EDIT_BUFFER)
void HV_Edit_Buffer::print(const char *text) {
printf("HV_Edit_Buffer::print(%s), capacity=%d, size=%d\n",
text, capacity(), size());
printf(" \"%s\"\n", c_str() && size() ? c_str() : "");
fflush(stdout);
} // print()
#endif
// [End of internal class HV_Edit_Buffer]
/** Adds a text block to the list. */
Fl_Help_Block * // O - Pointer to new block
Fl_Help_View::add_block(const char *s, // I - Pointer to start of block text
int xx, // I - X position of block
int yy, // I - Y position of block
int ww, // I - Right margin of block
int hh, // I - Height of block
unsigned char border) // I - Draw border?
{
Fl_Help_Block *temp; // New block
// printf("add_block(s = %p, xx = %d, yy = %d, ww = %d, hh = %d, border = %d)\n",
// s, xx, yy, ww, hh, border);
if (nblocks_ >= ablocks_)
{
ablocks_ += 16;
if (ablocks_ == 16)
blocks_ = (Fl_Help_Block *)malloc(sizeof(Fl_Help_Block) * ablocks_);
else
blocks_ = (Fl_Help_Block *)realloc(blocks_, sizeof(Fl_Help_Block) * ablocks_);
}
temp = blocks_ + nblocks_;
memset(temp, 0, sizeof(Fl_Help_Block));
temp->start = s;
temp->end = s;
temp->x = xx;
temp->y = yy;
temp->w = ww;
temp->h = hh;
temp->border = border;
temp->bgcolor = bgcolor_;
nblocks_ ++;
return (temp);
}
/** Adds a new link to the list. */
void Fl_Help_View::add_link(const char *n, // I - Name of link
int xx, // I - X position of link
int yy, // I - Y position of link
int ww, // I - Width of link text
int hh) // I - Height of link text
{
Fl_Help_Link *temp; // New link
char *target; // Pointer to target name
if (nlinks_ >= alinks_)
{
alinks_ += 16;
if (alinks_ == 16)
links_ = (Fl_Help_Link *)malloc(sizeof(Fl_Help_Link) * alinks_);
else
links_ = (Fl_Help_Link *)realloc(links_, sizeof(Fl_Help_Link) * alinks_);
}
temp = links_ + nlinks_;
temp->x = xx;
temp->y = yy;
temp->w = xx + ww;
temp->h = yy + hh;
strlcpy(temp->filename, n, sizeof(temp->filename));
if ((target = strrchr(temp->filename, '#')) != NULL)
{
*target++ = '\0';
strlcpy(temp->name, target, sizeof(temp->name));
}
else
temp->name[0] = '\0';
nlinks_ ++;
}
/** Adds a new target to the list. */
void Fl_Help_View::add_target(const char *n, // I - Name of target
int yy) // I - Y position of target
{
Fl_Help_Target *temp; // New target
if (ntargets_ >= atargets_)
{
atargets_ += 16;
if (atargets_ == 16)
targets_ = (Fl_Help_Target *)malloc(sizeof(Fl_Help_Target) * atargets_);
else
targets_ = (Fl_Help_Target *)realloc(targets_, sizeof(Fl_Help_Target) * atargets_);
}
temp = targets_ + ntargets_;
temp->y = yy;
strlcpy(temp->name, n, sizeof(temp->name));
ntargets_ ++;
}
/** Compares two targets.*/
int // O - Result of comparison
Fl_Help_View::compare_targets(const Fl_Help_Target *t0, // I - First target
const Fl_Help_Target *t1) // I - Second target
{
return (strcasecmp(t0->name, t1->name));
}
/** Computes the alignment for a line in a block.*/
int // O - New line
Fl_Help_View::do_align(Fl_Help_Block *block, // I - Block to add to
int line, // I - Current line
int xx, // I - Current X position
int a, // I - Current alignment
int &l) // IO - Starting link
{
int offset; // Alignment offset
switch (a)
{
case RIGHT : // Right align
offset = block->w - xx;
break;
case CENTER : // Center
offset = (block->w - xx) / 2;
break;
default : // Left align
offset = 0;
break;
}
block->line[line] = block->x + offset;
if (line < 31)
line ++;
while (l < nlinks_)
{
links_[l].x += offset;
links_[l].w += offset;
l ++;
}
return (line);
}
/** Draws the Fl_Help_View widget. */
void
Fl_Help_View::draw()
{
int i; // Looping var
const Fl_Help_Block *block; // Pointer to current block
const char *ptr, // Pointer to text in block
*attrs; // Pointer to start of element attributes
HV_Edit_Buffer buf; // Text buffer
char attr[1024]; // Attribute buffer
int xx, yy, ww, hh; // Current positions and sizes
int line; // Current line
Fl_Font font;
Fl_Fontsize fsize; // Current font and size
Fl_Color fcolor; // current font color
int head, pre, // Flags for text
needspace; // Do we need whitespace?
Fl_Boxtype b = box() ? box() : FL_DOWN_BOX;
// Box to draw...
int underline, // Underline text?
xtra_ww; // Extra width for underlined space between words
DEBUG_FUNCTION(__LINE__,__FUNCTION__);
// Draw the scrollbar(s) and box first...
ww = w();
hh = h();
i = 0;
draw_box(b, x(), y(), ww, hh, bgcolor_);
if ( hscrollbar_.visible() || scrollbar_.visible() ) {
int scrollsize = scrollbar_size_ ? scrollbar_size_ : Fl::scrollbar_size();
int hor_vis = hscrollbar_.visible();
int ver_vis = scrollbar_.visible();
// Scrollbar corner
int scorn_x = x() + ww - (ver_vis?scrollsize:0) - Fl::box_dw(b) + Fl::box_dx(b);
int scorn_y = y() + hh - (hor_vis?scrollsize:0) - Fl::box_dh(b) + Fl::box_dy(b);
if ( hor_vis ) {
if ( hscrollbar_.h() != scrollsize ) { // scrollsize changed?
hscrollbar_.resize(x(), scorn_y, scorn_x - x(), scrollsize);
init_sizes();
}
draw_child(hscrollbar_);
hh -= scrollsize;
}
if ( ver_vis ) {
if ( scrollbar_.w() != scrollsize ) { // scrollsize changed?
scrollbar_.resize(scorn_x, y(), scrollsize, scorn_y - y());
init_sizes();
}
draw_child(scrollbar_);
ww -= scrollsize;
}
if ( hor_vis && ver_vis ) {
// Both scrollbars visible? Draw little gray box in corner
fl_color(FL_GRAY);
fl_rectf(scorn_x, scorn_y, scrollsize, scrollsize);
}
}
if (!value_)
return;
if (current_view == this && selected) {
hv_selection_color = FL_SELECTION_COLOR;
hv_selection_text_color = fl_contrast(textcolor_, FL_SELECTION_COLOR);
}
current_pos = 0;
// Clip the drawing to the inside of the box...
fl_push_clip(x() + Fl::box_dx(b), y() + Fl::box_dy(b),
ww - Fl::box_dw(b), hh - Fl::box_dh(b));
fl_color(textcolor_);
// Draw all visible blocks...
for (i = 0, block = blocks_; i < nblocks_; i ++, block ++)
if ((block->y + block->h) >= topline_ && block->y < (topline_ + h()))
{
line = 0;
xx = block->line[line];
yy = block->y - topline_;
hh = 0;
pre = 0;
head = 0;
needspace = 0;
underline = 0;
initfont(font, fsize, fcolor);
// byte length difference between html entity (encoded by &...;) and
// UTF-8 encoding of same character
int entity_extra_length = 0;
for (ptr = block->start, buf.clear(); ptr < block->end;)
{
if ((*ptr == '<' || isspace((*ptr)&255)) && buf.size() > 0)
{
if (!head && !pre)
{
// Check width...
ww = buf.width();
if (needspace && xx > block->x)
xx += (int)fl_width(' ');
if ((xx + ww) > block->w)
{
if (line < 31)
line ++;
xx = block->line[line];
yy += hh;
hh = 0;
}
hv_draw(buf.c_str(), xx + x() - leftline_, yy + y(), entity_extra_length);
buf.clear();
entity_extra_length = 0;
if (underline) {
xtra_ww = isspace((*ptr)&255)?(int)fl_width(' '):0;
fl_xyline(xx + x() - leftline_, yy + y() + 1,
xx + x() - leftline_ + ww + xtra_ww);
}
current_pos = (int) (ptr-value_);
xx += ww;
if ((fsize + 2) > hh)
hh = fsize + 2;
needspace = 0;
}
else if (pre)
{
while (isspace((*ptr)&255))
{
if (*ptr == '\n')
{
hv_draw(buf.c_str(), xx + x() - leftline_, yy + y());
if (underline) fl_xyline(xx + x() - leftline_, yy + y() + 1,
xx + x() - leftline_ + buf.width());
buf.clear();
current_pos = (int) (ptr-value_);
if (line < 31)
line ++;
xx = block->line[line];
yy += hh;
hh = fsize + 2;
}
else if (*ptr == '\t')
{
// Do tabs every 8 columns...
buf += ' '; // add at least one space
while (buf.size() & 7)
buf += ' ';
}
else {
buf += ' ';
}
if ((fsize + 2) > hh)
hh = fsize + 2;
ptr ++;
}
if (buf.size() > 0)
{
hv_draw(buf.c_str(), xx + x() - leftline_, yy + y());
ww = buf.width();
buf.clear();
if (underline) fl_xyline(xx + x() - leftline_, yy + y() + 1,
xx + x() - leftline_ + ww);
xx += ww;
current_pos = (int) (ptr-value_);
}
needspace = 0;
}
else
{
buf.clear();
while (isspace((*ptr)&255))
ptr ++;
current_pos = (int) (ptr-value_);
}
}
if (*ptr == '<')
{
ptr ++;
if (strncmp(ptr, "!--", 3) == 0)
{
// Comment...
ptr += 3;
if ((ptr = strstr(ptr, "-->")) != NULL)
{
ptr += 3;
continue;
}
else
break;
}
while (*ptr && *ptr != '>' && !isspace((*ptr)&255))
buf += *ptr++;
attrs = ptr;
while (*ptr && *ptr != '>')
ptr ++;
if (*ptr == '>')
ptr ++;
// end of command reached, set the supposed start of printed eord here
current_pos = (int) (ptr-value_);
if (buf.cmp("HEAD"))
head = 1;
else if (buf.cmp("BR"))
{
if (line < 31)
line ++;
xx = block->line[line];
yy += hh;
hh = 0;
}
else if (buf.cmp("HR"))
{
fl_line(block->x + x(), yy + y(), block->w + x(),
yy + y());
if (line < 31)
line ++;
xx = block->line[line];
yy += 2 * fsize;//hh;
hh = 0;
}
else if (buf.cmp("CENTER") ||
buf.cmp("P") ||
buf.cmp("H1") ||
buf.cmp("H2") ||
buf.cmp("H3") ||
buf.cmp("H4") ||
buf.cmp("H5") ||
buf.cmp("H6") ||
buf.cmp("UL") ||
buf.cmp("OL") ||
buf.cmp("DL") ||
buf.cmp("LI") ||
buf.cmp("DD") ||
buf.cmp("DT") ||
buf.cmp("PRE"))
{
if (tolower(buf[0]) == 'h')
{
font = FL_HELVETICA_BOLD;
fsize = textsize_ + '7' - buf[1];
}
else if (buf.cmp("DT"))
{
font = textfont_ | FL_ITALIC;
fsize = textsize_;
}
else if (buf.cmp("PRE"))
{
font = FL_COURIER;
fsize = textsize_;
pre = 1;
}
if (buf.cmp("LI"))
{
if (block->ol) {
char buf[10];
snprintf(buf, sizeof(buf), "%d. ", block->ol_num);
hv_draw(buf, xx - (int)fl_width(buf) + x() - leftline_, yy + y());
}
else {
// draw bullet (&bull;) Unicode: U+2022, UTF-8 (hex): e2 80 a2
unsigned char bullet[4] = { 0xe2, 0x80, 0xa2, 0x00 };
hv_draw((char *)bullet, xx - fsize + x() - leftline_, yy + y());
}
}
pushfont(font, fsize);
buf.clear();
}
else if (buf.cmp("A") &&
get_attr(attrs, "HREF", attr, sizeof(attr)) != NULL)
{
fl_color(linkcolor_);
underline = 1;
}
else if (buf.cmp("/A"))
{
fl_color(textcolor_);
underline = 0;
}
else if (buf.cmp("FONT"))
{
if (get_attr(attrs, "COLOR", attr, sizeof(attr)) != NULL) {
textcolor_ = get_color(attr, textcolor_);
}
if (get_attr(attrs, "FACE", attr, sizeof(attr)) != NULL) {
if (!strncasecmp(attr, "helvetica", 9) ||
!strncasecmp(attr, "arial", 5) ||
!strncasecmp(attr, "sans", 4)) font = FL_HELVETICA;
else if (!strncasecmp(attr, "times", 5) ||
!strncasecmp(attr, "serif", 5)) font = FL_TIMES;
else if (!strncasecmp(attr, "symbol", 6)) font = FL_SYMBOL;
else font = FL_COURIER;
}
if (get_attr(attrs, "SIZE", attr, sizeof(attr)) != NULL) {
if (isdigit(attr[0] & 255)) {
// Absolute size
fsize = (int)(textsize_ * pow(1.2, atof(attr) - 3.0));
} else {
// Relative size
fsize = (int)(fsize * pow(1.2, atof(attr) - 3.0));
}
}
pushfont(font, fsize);
}
else if (buf.cmp("/FONT"))
{
popfont(font, fsize, textcolor_);
}
else if (buf.cmp("U"))
underline = 1;
else if (buf.cmp("/U"))
underline = 0;
else if (buf.cmp("B") ||
buf.cmp("STRONG"))
pushfont(font |= FL_BOLD, fsize);
else if (buf.cmp("TD") ||
buf.cmp("TH"))
{
int tx, ty, tw, th;
if (tolower(buf[1]) == 'h')
pushfont(font |= FL_BOLD, fsize);
else
pushfont(font = textfont_, fsize);
tx = block->x - 4 - leftline_;
ty = block->y - topline_ - fsize - 3;
tw = block->w - block->x + 7;
th = block->h + fsize - 5;
if (tx < 0)
{
tw += tx;
tx = 0;
}
if (ty < 0)
{
th += ty;
ty = 0;
}
tx += x();
ty += y();
if (block->bgcolor != bgcolor_)
{
fl_color(block->bgcolor);
fl_rectf(tx, ty, tw, th);
fl_color(textcolor_);
}
if (block->border)
fl_rect(tx, ty, tw, th);
}
else if (buf.cmp("I") ||
buf.cmp("EM"))
pushfont(font |= FL_ITALIC, fsize);
else if (buf.cmp("CODE") ||
buf.cmp("TT"))
pushfont(font = FL_COURIER, fsize);
else if (buf.cmp("KBD"))
pushfont(font = FL_COURIER_BOLD, fsize);
else if (buf.cmp("VAR"))
pushfont(font = FL_COURIER_ITALIC, fsize);
else if (buf.cmp("/HEAD"))
head = 0;
else if (buf.cmp("/H1") ||
buf.cmp("/H2") ||
buf.cmp("/H3") ||
buf.cmp("/H4") ||
buf.cmp("/H5") ||
buf.cmp("/H6") ||
buf.cmp("/B") ||
buf.cmp("/STRONG") ||
buf.cmp("/I") ||
buf.cmp("/EM") ||
buf.cmp("/CODE") ||
buf.cmp("/TT") ||
buf.cmp("/KBD") ||
buf.cmp("/VAR"))
popfont(font, fsize, fcolor);
else if (buf.cmp("/PRE"))
{
popfont(font, fsize, fcolor);
pre = 0;
}
else if (buf.cmp("IMG"))
{
Fl_Shared_Image *img = 0;
int width, height;
char wattr[8], hattr[8];
get_attr(attrs, "WIDTH", wattr, sizeof(wattr));
get_attr(attrs, "HEIGHT", hattr, sizeof(hattr));
width = get_length(wattr);
height = get_length(hattr);
if (get_attr(attrs, "SRC", attr, sizeof(attr))) {
img = get_image(attr, width, height);
if (!width) width = img->w();
if (!height) height = img->h();
}
if (!width || !height) {
if (get_attr(attrs, "ALT", attr, sizeof(attr)) == NULL) {
strcpy(attr, "IMG");
}
}
ww = width;
if (needspace && xx > block->x)
xx += (int)fl_width(' ');
if ((xx + ww) > block->w)
{
if (line < 31)
line ++;
xx = block->line[line];
yy += hh;
hh = 0;
}
if (img) {
img->draw(xx + x() - leftline_,
yy + y() - fl_height() + fl_descent() + 2);
}
xx += ww;
if ((height + 2) > hh)
hh = height + 2;
needspace = 0;
}
buf.clear();
}
else if (*ptr == '\n' && pre)
{
hv_draw(buf.c_str(), xx + x() - leftline_, yy + y());
buf.clear();
if (line < 31)
line ++;
xx = block->line[line];
yy += hh;
hh = fsize + 2;
needspace = 0;
ptr ++;
current_pos = (int) (ptr-value_);
}
else if (isspace((*ptr)&255))
{
if (pre)
{
if (*ptr == ' ')
buf += ' ';
else
{
// Do tabs every 8 columns...
buf += ' '; // at least one space
while (buf.size() & 7)
buf += ' ';
}
}
ptr ++;
if (!pre) current_pos = (int) (ptr-value_);
needspace = 1;
}
else if (*ptr == '&') // process html entity
{
ptr ++;
int qch = quote_char(ptr);
if (qch < 0)
buf += '&';
else {
int utf8l = buf.size();
buf.add(qch);
utf8l = buf.size() - utf8l; // length of added UTF-8 text
const char *oldptr = ptr;
ptr = strchr(ptr, ';') + 1;
entity_extra_length += int(ptr - (oldptr-1)) - utf8l; // extra length between html entity and UTF-8
}
if ((fsize + 2) > hh)
hh = fsize + 2;
}
else
{
buf += *ptr++;
if ((fsize + 2) > hh)
hh = fsize + 2;
}
}
if (buf.size() > 0 && !pre && !head)
{
ww = buf.width();
if (needspace && xx > block->x)
xx += (int)fl_width(' ');
if ((xx + ww) > block->w)
{
if (line < 31)
line ++;
xx = block->line[line];
yy += hh;
hh = 0;
}
}
if (buf.size() > 0 && !head)
{
hv_draw(buf.c_str(), xx + x() - leftline_, yy + y());
if (underline) fl_xyline(xx + x() - leftline_, yy + y() + 1,
xx + x() - leftline_ + ww);
current_pos = (int) (ptr-value_);
}
}
fl_pop_clip();
} // draw()
/** Finds the specified string \p s at starting position \p p.
The argument \p p and the return value are offsets in Fl_Help_View::value(),
counting from 0. If \p p is out of range, 0 is used.
The string comparison is simple but honors some special cases:
- the specified string \p s must be in UTF-8 encoding
- HTML tags in value() are filtered (not compared as such, they never match)
- HTML entities like '\&lt;' or '\&x#20ac;' are converted to Unicode (UTF-8)
- ASCII characters (7-bit, \< 0x80) are compared case insensitive
- every newline (LF, '\\n') in value() is treated like a single space
- all other strings are compared as-is (byte by byte)
\todo complex HTML entities for Unicode code points \> 0x80 are currently treated
like one byte (not character!) and do not (yet) match correctly ("<" matches "&lt;"
but "€" doesn't match "&euro;", and "ü" doesn't match "&uuml;")
\param[in] s search string in UTF-8 encoding
\param[in] p starting position for search (0,...), Default = 0
\return the matching position or -1 if not found
*/
int // O - Matching position or -1 if not found
Fl_Help_View::find(const char *s, // I - String to find
int p) // I - Starting position
{
int i, // Looping var
c; // Current character
Fl_Help_Block *b; // Current block
const char *bp, // Block matching pointer
*bs, // Start of current comparison
*sp; // Search string pointer
DEBUG_FUNCTION(__LINE__,__FUNCTION__);
// Range check input and value...
if (!s || !value_) return -1;
if (p < 0 || p >= (int)strlen(value_)) p = 0;
// Look for the string...
for (i = nblocks_, b = blocks_; i > 0; i--, b++) {
if (b->end < (value_ + p))
continue;
if (b->start < (value_ + p)) bp = value_ + p;
else bp = b->start;
for (sp = s, bs = bp; *sp && *bp && bp < b->end; bp++) {
if (*bp == '<') {
// skip to end of element...
while (*bp && bp < b->end && *bp != '>') bp++;
// no match, so reset to start of search...
sp = s;
bs = bp + 1;
continue;
} else if (*bp == '&') {
// decode HTML entity...
if ((c = quote_char(bp + 1)) < 0) c = '&'; // *FIXME* UTF-8, see below
else bp = strchr(bp + 1, ';') + 1;
} else c = *bp;
if (c == '\n') c = ' '; // treat newline as a single space
// *FIXME* *UTF-8* (A.S. 02/14/2016)
// At this point c may be an arbitrary Unicode Code Point corresponding
// to a quoted character (see above), i.e. it _can_ be a multi byte
// UTF-8 sequence and must be compared with the corresponding
// multi byte string in (*sp)...
// For instance: "&euro;" == 0x20ac -> 0xe2 0x82 0xac (UTF-8: 3 bytes).
// Hint: use fl_utf8encode() [see below]
if (c > 0x20 && c < 0x80 && tolower(*sp) == tolower(c)) sp++;
else if (*sp == c) sp++;
else { // No match, so reset to start of search...
sp = s;
bp = bs;
bs++;
}
}
if (!*sp) { // Found a match!
topline(b->y - b->h);
return int(bs - value_);
}
}
// No match!
return (-1);
}
/** Formats the help text. */
void Fl_Help_View::format() {
int i; // Looping var
int done; // Are we done yet?
Fl_Help_Block *block, // Current block
*cell; // Current table cell
int cells[MAX_COLUMNS],
// Cells in the current row...
row; // Current table row (block number)
const char *ptr, // Pointer into block
*start, // Pointer to start of element
*attrs; // Pointer to start of element attributes
HV_Edit_Buffer buf; // Text buffer
char attr[1024], // Attribute buffer
wattr[1024], // Width attribute buffer
hattr[1024], // Height attribute buffer
linkdest[1024]; // Link destination
int xx, yy, ww, hh; // Size of current text fragment
int line; // Current line in block
int links; // Links for current line
Fl_Font font;
Fl_Fontsize fsize; // Current font and size
Fl_Color fcolor; // Current font color
unsigned char border; // Draw border?
int talign, // Current alignment
newalign, // New alignment
head, // In the <HEAD> section?
pre, // <PRE> text?
needspace; // Do we need whitespace?
int table_width, // Width of table
table_offset; // Offset of table
int column, // Current table column number
columns[MAX_COLUMNS];
// Column widths
Fl_Color tc, rc; // Table/row background color
Fl_Boxtype b = box() ? box() : FL_DOWN_BOX;
// Box to draw...
fl_margins margins; // Left margin stack...
Fl_Int_Vector OL_num; // if nonnegative, in OL mode and this is the item number
OL_num.push_back(-1);
DEBUG_FUNCTION(__LINE__,__FUNCTION__);
// Reset document width...
int scrollsize = scrollbar_size_ ? scrollbar_size_ : Fl::scrollbar_size();
hsize_ = w() - scrollsize - Fl::box_dw(b);
done = 0;
while (!done)
{
// Reset state variables...
done = 1;
nblocks_ = 0;
nlinks_ = 0;
ntargets_ = 0;
size_ = 0;
bgcolor_ = color();
textcolor_ = textcolor();
linkcolor_ = fl_contrast(FL_BLUE, color());
tc = rc = bgcolor_;
strcpy(title_, "Untitled");
if (!value_)
return;
// Setup for formatting...
initfont(font, fsize, fcolor);
line = 0;
links = 0;
xx = margins.clear();
yy = fsize + 2;
ww = 0;
column = 0;
border = 0;
hh = 0;
block = add_block(value_, xx, yy, hsize_, 0);
row = 0;
head = 0;
pre = 0;
talign = LEFT;
newalign = LEFT;
needspace = 0;
linkdest[0] = '\0';
table_offset = 0;
// Html text character loop
for (ptr = value_, buf.clear(); *ptr;)
{
// End of word?
if ((*ptr == '<' || isspace((*ptr)&255)) && buf.size() > 0)
{
// Get width of word parsed so far...
ww = buf.width();
if (!head && !pre)
{
// Check width...
if (ww > hsize_) {
hsize_ = ww;
done = 0;
break;
}
if (needspace && xx > block->x)
ww += (int)fl_width(' ');
// printf("line = %d, xx = %d, ww = %d, block->x = %d, block->w = %d\n",
// line, xx, ww, block->x, block->w);
if ((xx + ww) > block->w)
{
line = do_align(block, line, xx, newalign, links);
xx = block->x;
yy += hh;
block->h += hh;
hh = 0;
}
if (linkdest[0])
add_link(linkdest, xx, yy - fsize, ww, fsize);
xx += ww;
if ((fsize + 2) > hh)
hh = fsize + 2;
needspace = 0;
}
else if (pre)
{
// Add a link as needed...
if (linkdest[0])
add_link(linkdest, xx, yy - hh, ww, hh);
xx += ww;
if ((fsize + 2) > hh)
hh = fsize + 2;
// Handle preformatted text...
while (isspace((*ptr)&255))
{
if (*ptr == '\n')
{
if (xx > hsize_) break;
line = do_align(block, line, xx, newalign, links);
xx = block->x;
yy += hh;
block->h += hh;
hh = fsize + 2;
}
else
xx += (int)fl_width(' ');
if ((fsize + 2) > hh)
hh = fsize + 2;
ptr ++;
}
if (xx > hsize_) {
hsize_ = xx;
done = 0;
break;
}
needspace = 0;
}
else
{
// Handle normal text or stuff in the <HEAD> section...
while (isspace((*ptr)&255))
ptr ++;
}
buf.clear();
}
if (*ptr == '<')
{
// Handle html tags..
start = ptr;
ptr ++;
if (strncmp(ptr, "!--", 3) == 0)
{
// Comment...
ptr += 3;
if ((ptr = strstr(ptr, "-->")) != NULL)
{
ptr += 3;
continue;
}
else
break;
}
while (*ptr && *ptr != '>' && !isspace((*ptr)&255))
buf += *ptr++;
attrs = ptr;
while (*ptr && *ptr != '>')
ptr ++;
if (*ptr == '>')
ptr ++;
if (buf.cmp("HEAD"))
head = 1;
else if (buf.cmp("/HEAD"))
head = 0;
else if (buf.cmp("TITLE"))
{
// Copy the title in the document...
char *st;
for (st = title_;
*ptr != '<' && *ptr && st < (title_ + sizeof(title_) - 1);
*st++ = *ptr++) {/*empty*/}
*st = '\0';
buf.clear();
}
else if (buf.cmp("A"))
{
if (get_attr(attrs, "NAME", attr, sizeof(attr)) != NULL)
add_target(attr, yy - fsize - 2);
if (get_attr(attrs, "HREF", attr, sizeof(attr)) != NULL)
strlcpy(linkdest, attr, sizeof(linkdest));
}
else if (buf.cmp("/A"))
linkdest[0] = '\0';
else if (buf.cmp("BODY"))
{
bgcolor_ = get_color(get_attr(attrs, "BGCOLOR", attr, sizeof(attr)),
color());
textcolor_ = get_color(get_attr(attrs, "TEXT", attr, sizeof(attr)),
textcolor());
linkcolor_ = get_color(get_attr(attrs, "LINK", attr, sizeof(attr)),
fl_contrast(FL_BLUE, color()));
}
else if (buf.cmp("BR"))
{
line = do_align(block, line, xx, newalign, links);
xx = block->x;
block->h += hh;
yy += hh;
hh = 0;
}
else if (buf.cmp("CENTER") ||
buf.cmp("P") ||
buf.cmp("H1") ||
buf.cmp("H2") ||
buf.cmp("H3") ||
buf.cmp("H4") ||
buf.cmp("H5") ||
buf.cmp("H6") ||
buf.cmp("UL") ||
buf.cmp("OL") ||
buf.cmp("DL") ||
buf.cmp("LI") ||
buf.cmp("DD") ||
buf.cmp("DT") ||
buf.cmp("HR") ||
buf.cmp("PRE") ||
buf.cmp("TABLE"))
{
block->end = start;
line = do_align(block, line, xx, newalign, links);
newalign = buf.cmp("CENTER") ? CENTER : LEFT;
xx = block->x;
block->h += hh;
if (buf.cmp("OL")) {
int ol_num = 1;
if (get_attr(attrs, "START", attr, sizeof(attr)) != NULL) {
errno = 0;
char *endptr = 0;
ol_num = (int)strtol(attr, &endptr, 10);
if (errno || endptr == attr || ol_num < 0)
ol_num = 1;
}
OL_num.push_back(ol_num);
}
else if (buf.cmp("UL"))
OL_num.push_back(-1);
if (buf.cmp("UL") ||
buf.cmp("OL") ||
buf.cmp("DL"))
{
block->h += fsize + 2;
xx = margins.push(4 * fsize);
}
else if (buf.cmp("TABLE"))
{
if (get_attr(attrs, "BORDER", attr, sizeof(attr)))
border = (uchar)atoi(attr);
else
border = 0;
tc = rc = get_color(get_attr(attrs, "BGCOLOR", attr, sizeof(attr)), bgcolor_);
block->h += fsize + 2;
format_table(&table_width, columns, start);
if ((xx + table_width) > hsize_) {
#ifdef DEBUG
printf("xx=%d, table_width=%d, hsize_=%d\n", xx, table_width,
hsize_);
#endif // DEBUG
hsize_ = xx + table_width;
done = 0;
break;
}
switch (get_align(attrs, talign))
{
default :
table_offset = 0;
break;
case CENTER :
table_offset = (hsize_ - table_width) / 2 - textsize_;
break;
case RIGHT :
table_offset = hsize_ - table_width - textsize_;
break;
}
column = 0;
}
if (tolower(buf[0]) == 'h' && isdigit(buf[1]))
{
font = FL_HELVETICA_BOLD;
fsize = textsize_ + '7' - buf[1];
}
else if (buf.cmp("DT"))
{
font = textfont_ | FL_ITALIC;
fsize = textsize_;
}
else if (buf.cmp("PRE"))
{
font = FL_COURIER;
fsize = textsize_;
pre = 1;
}
else
{
font = textfont_;
fsize = textsize_;
}
pushfont(font, fsize);
yy = block->y + block->h;
hh = 0;
if ((tolower(buf[0]) == 'h' && isdigit(buf[1])) ||
buf.cmp("DD") ||
buf.cmp("DT") ||
buf.cmp("P"))
yy += fsize + 2;
else if (buf.cmp("HR"))
{
hh += 2 * fsize;
yy += fsize;
}
if (row)
block = add_block(start, xx, yy, block->w, 0);
else
block = add_block(start, xx, yy, hsize_, 0);
if (buf.cmp("LI")) {
block->ol = 0;
if (OL_num.size() && OL_num.back()>=0) {
block->ol = 1;
block->ol_num = (int)OL_num.back();
int nnum = OL_num.pop_back() + 1;
OL_num.push_back(nnum);
}
}
needspace = 0;
line = 0;
if (buf.cmp("CENTER"))
newalign = talign = CENTER;
else
newalign = get_align(attrs, talign);
}
else if (buf.cmp("/CENTER") ||
buf.cmp("/P") ||
buf.cmp("/H1") ||
buf.cmp("/H2") ||
buf.cmp("/H3") ||
buf.cmp("/H4") ||
buf.cmp("/H5") ||
buf.cmp("/H6") ||
buf.cmp("/PRE") ||
buf.cmp("/UL") ||
buf.cmp("/OL") ||
buf.cmp("/DL") ||
buf.cmp("/TABLE"))
{
line = do_align(block, line, xx, newalign, links);
xx = block->x;
block->end = ptr;
if (buf.cmp("/OL") ||
buf.cmp("/UL")) {
if (OL_num.size()) OL_num.pop_back();
}
if (buf.cmp("/UL") ||
buf.cmp("/OL") ||
buf.cmp("/DL"))
{
xx = margins.pop();
block->h += fsize + 2;
}
else if (buf.cmp("/TABLE"))
{
block->h += fsize + 2;
xx = margins.current();
}
else if (buf.cmp("/PRE"))
{
pre = 0;
hh = 0;
}
else if (buf.cmp("/CENTER"))
talign = LEFT;
popfont(font, fsize, fcolor);
//#if defined(__GNUC__)
//#warning FIXME this isspace & 255 test will probably not work on a utf8 stream... And we use it everywhere!
//#endif /*__GNUC__*/
while (isspace((*ptr)&255))
ptr ++;
block->h += hh;
yy += hh;
if (tolower(buf[2]) == 'l')
yy += fsize + 2;
if (row)
block = add_block(ptr, xx, yy, block->w, 0);
else
block = add_block(ptr, xx, yy, hsize_, 0);
needspace = 0;
hh = 0;
line = 0;
newalign = talign;
}
else if (buf.cmp("TR"))
{
block->end = start;
line = do_align(block, line, xx, newalign, links);
xx = block->x;
block->h += hh;
if (row)
{
yy = blocks_[row].y + blocks_[row].h;
for (cell = blocks_ + row + 1; cell <= block; cell ++)
if ((cell->y + cell->h) > yy)
yy = cell->y + cell->h;
block = blocks_ + row;
block->h = yy - block->y + 2;
for (i = 0; i < column; i ++)
if (cells[i])
{
cell = blocks_ + cells[i];
cell->h = block->h;
}
}
memset(cells, 0, sizeof(cells));
yy = block->y + block->h - 4;
hh = 0;
block = add_block(start, xx, yy, hsize_, 0);
row = (int) (block - blocks_);
needspace = 0;
column = 0;
line = 0;
rc = get_color(get_attr(attrs, "BGCOLOR", attr, sizeof(attr)), tc);
}
else if (buf.cmp("/TR") && row)
{
line = do_align(block, line, xx, newalign, links);
block->end = start;
block->h += hh;
talign = LEFT;
xx = blocks_[row].x;
yy = blocks_[row].y + blocks_[row].h;
for (cell = blocks_ + row + 1; cell <= block; cell ++)
if ((cell->y + cell->h) > yy)
yy = cell->y + cell->h;
block = blocks_ + row;
block->h = yy - block->y + 2;
for (i = 0; i < column; i ++)
if (cells[i])
{
cell = blocks_ + cells[i];
cell->h = block->h;
}
yy = block->y + block->h /*- 4*/;
block = add_block(start, xx, yy, hsize_, 0);
needspace = 0;
row = 0;
line = 0;
}
else if ((buf.cmp("TD") ||
buf.cmp("TH")) && row)
{
int colspan; // COLSPAN attribute
line = do_align(block, line, xx, newalign, links);
block->end = start;
block->h += hh;
if (buf.cmp("TH"))
font = textfont_ | FL_BOLD;
else
font = textfont_;
fsize = textsize_;
xx = blocks_[row].x + fsize + 3 + table_offset;
for (i = 0; i < column; i ++)
xx += columns[i] + 6;
margins.push(xx - margins.current());
if (get_attr(attrs, "COLSPAN", attr, sizeof(attr)) != NULL)
colspan = atoi(attr);
else
colspan = 1;
for (i = 0, ww = -6; i < colspan; i ++)
ww += columns[column + i] + 6;
if (block->end == block->start && nblocks_ > 1)
{
nblocks_ --;
block --;
}
pushfont(font, fsize);
yy = blocks_[row].y;
hh = 0;
block = add_block(start, xx, yy, xx + ww, 0, border);
needspace = 0;
line = 0;
newalign = get_align(attrs, tolower(buf[1]) == 'h' ? CENTER : LEFT);
talign = newalign;
cells[column] = (int) (block - blocks_);
column += colspan;
block->bgcolor = get_color(get_attr(attrs, "BGCOLOR", attr,
sizeof(attr)), rc);
}
else if ((buf.cmp("/TD") ||
buf.cmp("/TH")) && row)
{
line = do_align(block, line, xx, newalign, links);
popfont(font, fsize, fcolor);
xx = margins.pop();
talign = LEFT;
}
else if (buf.cmp("FONT"))
{
if (get_attr(attrs, "FACE", attr, sizeof(attr)) != NULL) {
if (!strncasecmp(attr, "helvetica", 9) ||
!strncasecmp(attr, "arial", 5) ||
!strncasecmp(attr, "sans", 4)) font = FL_HELVETICA;
else if (!strncasecmp(attr, "times", 5) ||
!strncasecmp(attr, "serif", 5)) font = FL_TIMES;
else if (!strncasecmp(attr, "symbol", 6)) font = FL_SYMBOL;
else font = FL_COURIER;
}
if (get_attr(attrs, "SIZE", attr, sizeof(attr)) != NULL) {
if (isdigit(attr[0] & 255)) {
// Absolute size
fsize = (int)(textsize_ * pow(1.2, atoi(attr) - 3.0));
} else {
// Relative size
fsize = (int)(fsize * pow(1.2, atoi(attr)));
}
}
pushfont(font, fsize);
}
else if (buf.cmp("/FONT"))
popfont(font, fsize, fcolor);
else if (buf.cmp("B") ||
buf.cmp("STRONG"))
pushfont(font |= FL_BOLD, fsize);
else if (buf.cmp("I") ||
buf.cmp("EM"))
pushfont(font |= FL_ITALIC, fsize);
else if (buf.cmp("CODE") ||
buf.cmp("TT"))
pushfont(font = FL_COURIER, fsize);
else if (buf.cmp("KBD"))
pushfont(font = FL_COURIER_BOLD, fsize);
else if (buf.cmp("VAR"))
pushfont(font = FL_COURIER_ITALIC, fsize);
else if (buf.cmp("/B") ||
buf.cmp("/STRONG") ||
buf.cmp("/I") ||
buf.cmp("/EM") ||
buf.cmp("/CODE") ||
buf.cmp("/TT") ||
buf.cmp("/KBD") ||
buf.cmp("/VAR"))
popfont(font, fsize, fcolor);
else if (buf.cmp("IMG"))
{
Fl_Shared_Image *img = 0;
int width;
int height;
get_attr(attrs, "WIDTH", wattr, sizeof(wattr));
get_attr(attrs, "HEIGHT", hattr, sizeof(hattr));
width = get_length(wattr);
height = get_length(hattr);
if (get_attr(attrs, "SRC", attr, sizeof(attr))) {
img = get_image(attr, width, height);
width = img->w();
height = img->h();
}
ww = width;
if (ww > hsize_) {
hsize_ = ww;
done = 0;
break;
}
if (needspace && xx > block->x)
ww += (int)fl_width(' ');
if ((xx + ww) > block->w)
{
line = do_align(block, line, xx, newalign, links);
xx = block->x;
yy += hh;
block->h += hh;
hh = 0;
}
if (linkdest[0])
add_link(linkdest, xx, yy-fsize, ww, height);
xx += ww;
if ((height + 2) > hh)
hh = height + 2;
needspace = 0;
}
buf.clear();
}
else if (*ptr == '\n' && pre)
{
if (linkdest[0])
add_link(linkdest, xx, yy - hh, ww, hh);
if (xx > hsize_) {
hsize_ = xx;
done = 0;
break;
}
line = do_align(block, line, xx, newalign, links);
xx = block->x;
yy += hh;
block->h += hh;
needspace = 0;
ptr ++;
}
else if (isspace((*ptr)&255))
{
needspace = 1;
if ( pre ) {
xx += (int)fl_width(' ');
}
ptr ++;
}
else if (*ptr == '&')
{
// Handle html '&' codes, eg. "&amp;"
ptr ++;
int qch = quote_char(ptr);
if (qch < 0)
buf += '&';
else {
buf.add(qch);
ptr = strchr(ptr, ';') + 1;
}
if ((fsize + 2) > hh)
hh = fsize + 2;
}
else
{
buf += *ptr++;
if ((fsize + 2) > hh)
hh = fsize + 2;
}
}
if (buf.size() > 0 && !head)
{
ww = buf.width();
// printf("line = %d, xx = %d, ww = %d, block->x = %d, block->w = %d\n",
// line, xx, ww, block->x, block->w);
if (ww > hsize_) {
hsize_ = ww;
done = 0;
break;
}
if (needspace && xx > block->x)
ww += (int)fl_width(' ');
if ((xx + ww) > block->w)
{
line = do_align(block, line, xx, newalign, links);
xx = block->x;
yy += hh;
block->h += hh;
hh = 0;
}
if (linkdest[0])
add_link(linkdest, xx, yy - fsize, ww, fsize);
xx += ww;
}
do_align(block, line, xx, newalign, links);
block->end = ptr;
size_ = yy + hh;
}
// printf("margins.depth_=%d\n", margins.depth_);
if (ntargets_ > 1)
qsort(targets_, ntargets_, sizeof(Fl_Help_Target),
(compare_func_t)compare_targets);
int dx = Fl::box_dw(b) - Fl::box_dx(b);
int dy = Fl::box_dh(b) - Fl::box_dy(b);
int ss = scrollbar_size_ ? scrollbar_size_ : Fl::scrollbar_size();
int dw = Fl::box_dw(b) + ss;
int dh = Fl::box_dh(b);
if (hsize_ > (w() - dw)) {
hscrollbar_.show();
dh += ss;
if (size_ < (h() - dh)) {
scrollbar_.hide();
hscrollbar_.resize(x() + Fl::box_dx(b), y() + h() - ss - dy,
w() - Fl::box_dw(b), ss);
} else {
scrollbar_.show();
scrollbar_.resize(x() + w() - ss - dx, y() + Fl::box_dy(b),
ss, h() - ss - Fl::box_dh(b));
hscrollbar_.resize(x() + Fl::box_dx(b), y() + h() - ss - dy,
w() - ss - Fl::box_dw(b), ss);
}
} else {
hscrollbar_.hide();
if (size_ < (h() - dh)) scrollbar_.hide();
else {
scrollbar_.resize(x() + w() - ss - dx, y() + Fl::box_dy(b),
ss, h() - Fl::box_dh(b));
scrollbar_.show();
}
}
// Reset scrolling if it needs to be...
if (scrollbar_.visible()) {
int temph = h() - Fl::box_dh(b);
if (hscrollbar_.visible()) temph -= ss;
if ((topline_ + temph) > size_) topline(size_ - temph);
else topline(topline_);
} else topline(0);
if (hscrollbar_.visible()) {
int tempw = w() - ss - Fl::box_dw(b);
if ((leftline_ + tempw) > hsize_) leftline(hsize_ - tempw);
else leftline(leftline_);
} else leftline(0);
}
/** Formats a table */
void
Fl_Help_View::format_table(int *table_width, // O - Total table width
int *columns, // O - Column widths
const char *table) // I - Pointer to start of table
{
int column, // Current column
num_columns, // Number of columns
colspan, // COLSPAN attribute
width, // Current width
temp_width, // Temporary width
max_width, // Maximum width
incell, // In a table cell?
pre, // <PRE> text?
needspace; // Need whitespace?
HV_Edit_Buffer buf; // Text buffer
char attr[1024], // Other attribute
wattr[1024], // WIDTH attribute
hattr[1024]; // HEIGHT attribute
const char *ptr, // Pointer into table
*attrs, // Pointer to attributes
*start; // Start of element
int minwidths[MAX_COLUMNS]; // Minimum widths for each column
Fl_Font font;
Fl_Fontsize fsize; // Current font and size
Fl_Color fcolor; // Currrent font color
DEBUG_FUNCTION(__LINE__,__FUNCTION__);
// Clear widths...
*table_width = 0;
for (column = 0; column < MAX_COLUMNS; column ++)
{
columns[column] = 0;
minwidths[column] = 0;
}
num_columns = 0;
colspan = 0;
max_width = 0;
pre = 0;
needspace = 0;
fstack_.top(font, fsize, fcolor);
// Scan the table...
for (ptr = table, column = -1, width = 0, incell = 0; *ptr;)
{
if ((*ptr == '<' || isspace((*ptr)&255)) && buf.size() > 0 && incell)
{
// Check width...
if (needspace)
{
buf += ' ';
needspace = 0;
}
temp_width = buf.width();
buf.clear();
if (temp_width > minwidths[column])
minwidths[column] = temp_width;
width += temp_width;
if (width > max_width)
max_width = width;
}
if (*ptr == '<')
{
start = ptr;
for (buf.clear(), ptr ++; *ptr && *ptr != '>' && !isspace((*ptr)&255);)
buf += *ptr++;
attrs = ptr;
while (*ptr && *ptr != '>')
ptr ++;
if (*ptr == '>')
ptr ++;
if (buf.cmp("BR") ||
buf.cmp("HR"))
{
width = 0;
needspace = 0;
}
else if (buf.cmp("TABLE") && start > table)
break;
else if (buf.cmp("CENTER") ||
buf.cmp("P") ||
buf.cmp("H1") ||
buf.cmp("H2") ||
buf.cmp("H3") ||
buf.cmp("H4") ||
buf.cmp("H5") ||
buf.cmp("H6") ||
buf.cmp("UL") ||
buf.cmp("OL") ||
buf.cmp("DL") ||
buf.cmp("LI") ||
buf.cmp("DD") ||
buf.cmp("DT") ||
buf.cmp("PRE"))
{
width = 0;
needspace = 0;
if (tolower(buf[0]) == 'h' && isdigit(buf[1]))
{
font = FL_HELVETICA_BOLD;
fsize = textsize_ + '7' - buf[1];
}
else if (buf.cmp("DT"))
{
font = textfont_ | FL_ITALIC;
fsize = textsize_;
}
else if (buf.cmp("PRE"))
{
font = FL_COURIER;
fsize = textsize_;
pre = 1;
}
else if (buf.cmp("LI"))
{
width += 4 * fsize;
font = textfont_;
fsize = textsize_;
}
else
{
font = textfont_;
fsize = textsize_;
}
pushfont(font, fsize);
}
else if (buf.cmp("/CENTER") ||
buf.cmp("/P") ||
buf.cmp("/H1") ||
buf.cmp("/H2") ||
buf.cmp("/H3") ||
buf.cmp("/H4") ||
buf.cmp("/H5") ||
buf.cmp("/H6") ||
buf.cmp("/PRE") ||
buf.cmp("/UL") ||
buf.cmp("/OL") ||
buf.cmp("/DL"))
{
width = 0;
needspace = 0;
popfont(font, fsize, fcolor);
}
else if (buf.cmp("TR") || buf.cmp("/TR") ||
buf.cmp("/TABLE"))
{
// printf("%s column = %d, colspan = %d, num_columns = %d\n",
// buf.c_str(), column, colspan, num_columns);
if (column >= 0)
{
// This is a hack to support COLSPAN...
max_width /= colspan;
while (colspan > 0)
{
if (max_width > columns[column])
columns[column] = max_width;
column ++;
colspan --;
}
}
if (buf.cmp("/TABLE"))
break;
needspace = 0;
column = -1;
width = 0;
max_width = 0;
incell = 0;
}
else if (buf.cmp("TD") ||
buf.cmp("TH"))
{
// printf("BEFORE column = %d, colspan = %d, num_columns = %d\n",
// column, colspan, num_columns);
if (column >= 0)
{
// This is a hack to support COLSPAN...
max_width /= colspan;
while (colspan > 0)
{
if (max_width > columns[column])
columns[column] = max_width;
column ++;
colspan --;
}
}
else
column ++;
if (get_attr(attrs, "COLSPAN", attr, sizeof(attr)) != NULL)
colspan = atoi(attr);
else
colspan = 1;
// printf("AFTER column = %d, colspan = %d, num_columns = %d\n",
// column, colspan, num_columns);
if ((column + colspan) >= num_columns)
num_columns = column + colspan;
needspace = 0;
width = 0;
incell = 1;
if (buf.cmp("TH"))
font = textfont_ | FL_BOLD;
else
font = textfont_;
fsize = textsize_;
pushfont(font, fsize);
if (get_attr(attrs, "WIDTH", attr, sizeof(attr)) != NULL)
max_width = get_length(attr);
else
max_width = 0;
// printf("max_width = %d\n", max_width);
}
else if (buf.cmp("/TD") ||
buf.cmp("/TH"))
{
incell = 0;
popfont(font, fsize, fcolor);
}
else if (buf.cmp("B") ||
buf.cmp("STRONG"))
pushfont(font |= FL_BOLD, fsize);
else if (buf.cmp("I") ||
buf.cmp("EM"))
pushfont(font |= FL_ITALIC, fsize);
else if (buf.cmp("CODE") ||
buf.cmp("TT"))
pushfont(font = FL_COURIER, fsize);
else if (buf.cmp("KBD"))
pushfont(font = FL_COURIER_BOLD, fsize);
else if (buf.cmp("VAR"))
pushfont(font = FL_COURIER_ITALIC, fsize);
else if (buf.cmp("/B") ||
buf.cmp("/STRONG") ||
buf.cmp("/I") ||
buf.cmp("/EM") ||
buf.cmp("/CODE") ||
buf.cmp("/TT") ||
buf.cmp("/KBD") ||
buf.cmp("/VAR"))
popfont(font, fsize, fcolor);
else if (buf.cmp("IMG") && incell)
{
Fl_Shared_Image *img = 0;
int iwidth, iheight;
get_attr(attrs, "WIDTH", wattr, sizeof(wattr));
get_attr(attrs, "HEIGHT", hattr, sizeof(hattr));
iwidth = get_length(wattr);
iheight = get_length(hattr);
if (get_attr(attrs, "SRC", attr, sizeof(attr))) {
img = get_image(attr, iwidth, iheight);
iwidth = img->w();
iheight = img->h();
}
if (iwidth > minwidths[column])
minwidths[column] = iwidth;
width += iwidth;
if (needspace)
width += (int)fl_width(' ');
if (width > max_width)
max_width = width;
needspace = 0;
}
buf.clear();
}
else if (*ptr == '\n' && pre)
{
width = 0;
needspace = 0;
ptr ++;
}
else if (isspace((*ptr)&255))
{
needspace = 1;
ptr ++;
}
else if (*ptr == '&' )
{
ptr ++;
int qch = quote_char(ptr);
if (qch < 0)
buf += '&';
else {
buf.add(qch);
ptr = strchr(ptr, ';') + 1;
}
}
else
{
buf += *ptr++;
}
}
// Now that we have scanned the entire table, adjust the table and
// cell widths to fit on the screen...
if (get_attr(table + 6, "WIDTH", attr, sizeof(attr)))
*table_width = get_length(attr);
else
*table_width = 0;
#ifdef DEBUG
printf("num_columns = %d, table_width = %d\n", num_columns, *table_width);
#endif // DEBUG
if (num_columns == 0)
return;
// Add up the widths...
for (column = 0, width = 0; column < num_columns; column ++)
width += columns[column];
#ifdef DEBUG
printf("width = %d, w() = %d\n", width, w());
for (column = 0; column < num_columns; column ++)
printf(" columns[%d] = %d, minwidths[%d] = %d\n", column, columns[column],
column, minwidths[column]);
#endif // DEBUG
// Adjust the width if needed...
int scale_width = *table_width;
int scrollsize = scrollbar_size_ ? scrollbar_size_ : Fl::scrollbar_size();
if (scale_width == 0) {
if (width > (hsize_ - scrollsize)) scale_width = hsize_ - scrollsize;
else scale_width = width;
}
if (width < scale_width) {
#ifdef DEBUG
printf("Scaling table up to %d from %d...\n", scale_width, width);
#endif // DEBUG
*table_width = 0;
scale_width = (scale_width - width) / num_columns;
#ifdef DEBUG
printf("adjusted scale_width = %d\n", scale_width);
#endif // DEBUG
for (column = 0; column < num_columns; column ++) {
columns[column] += scale_width;
(*table_width) += columns[column];
}
}
else if (width > scale_width) {
#ifdef DEBUG
printf("Scaling table down to %d from %d...\n", scale_width, width);
#endif // DEBUG
for (column = 0; column < num_columns; column ++) {
width -= minwidths[column];
scale_width -= minwidths[column];
}
#ifdef DEBUG
printf("adjusted width = %d, scale_width = %d\n", width, scale_width);
#endif // DEBUG
if (width > 0) {
for (column = 0; column < num_columns; column ++) {
columns[column] -= minwidths[column];
columns[column] = scale_width * columns[column] / width;
columns[column] += minwidths[column];
}
}
*table_width = 0;
for (column = 0; column < num_columns; column ++) {
(*table_width) += columns[column];
}
}
else if (*table_width == 0)
*table_width = width;
#ifdef DEBUG
printf("FINAL table_width = %d\n", *table_width);
for (column = 0; column < num_columns; column ++)
printf(" columns[%d] = %d\n", column, columns[column]);
#endif // DEBUG
}
/** Frees memory used for the document. */
void
Fl_Help_View::free_data() {
// Release all images...
if (value_) {
const char *ptr, // Pointer into block
*attrs; // Pointer to start of element attributes
HV_Edit_Buffer buf; // Text buffer
char attr[1024], // Attribute buffer
wattr[1024], // Width attribute buffer
hattr[1024]; // Height attribute buffer
DEBUG_FUNCTION(__LINE__,__FUNCTION__);
for (ptr = value_; *ptr;)
{
if (*ptr == '<')
{
ptr ++;
if (strncmp(ptr, "!--", 3) == 0)
{
// Comment...
ptr += 3;
if ((ptr = strstr(ptr, "-->")) != NULL)
{
ptr += 3;
continue;
}
else
break;
}
buf.clear();
while (*ptr && *ptr != '>' && !isspace((*ptr)&255))
buf += *ptr++;
attrs = ptr;
while (*ptr && *ptr != '>')
ptr ++;
if (*ptr == '>')
ptr ++;
if (buf.cmp("IMG"))
{
Fl_Shared_Image *img;
int width;
int height;
get_attr(attrs, "WIDTH", wattr, sizeof(wattr));
get_attr(attrs, "HEIGHT", hattr, sizeof(hattr));
width = get_length(wattr);
height = get_length(hattr);
if (get_attr(attrs, "SRC", attr, sizeof(attr))) {
// Get and release the image to free it from memory...
img = get_image(attr, width, height);
if ((void*)img != &broken_image) {
img->release();
}
}
}
}
else
ptr ++;
}
free((void *)value_);
value_ = 0;
}
// Free all of the arrays...
if (nblocks_) {
free(blocks_);
ablocks_ = 0;
nblocks_ = 0;
blocks_ = 0;
}
if (nlinks_) {
free(links_);
alinks_ = 0;
nlinks_ = 0;
links_ = 0;
}
if (ntargets_) {
free(targets_);
atargets_ = 0;
ntargets_ = 0;
targets_ = 0;
}
} // free_data()
/** Gets an alignment attribute. */
int // O - Alignment
Fl_Help_View::get_align(const char *p, // I - Pointer to start of attrs
int a) // I - Default alignment
{
char buf[255]; // Alignment value
if (get_attr(p, "ALIGN", buf, sizeof(buf)) == NULL)
return (a);
if (strcasecmp(buf, "CENTER") == 0)
return (CENTER);
else if (strcasecmp(buf, "RIGHT") == 0)
return (RIGHT);
else
return (LEFT);
}
/** Gets an attribute value from the string. */
const char * // O - Pointer to buf or NULL
Fl_Help_View::get_attr(const char *p, // I - Pointer to start of attributes
const char *n, // I - Name of attribute
char *buf, // O - Buffer for attribute value
int bufsize) // I - Size of buffer
{
char name[255], // Name from string
*ptr, // Pointer into name or value
quote; // Quote
buf[0] = '\0';
while (*p && *p != '>')
{
while (isspace((*p)&255))
p ++;
if (*p == '>' || !*p)
return (NULL);
for (ptr = name; *p && !isspace((*p)&255) && *p != '=' && *p != '>';)
if (ptr < (name + sizeof(name) - 1))
*ptr++ = *p++;
else
p ++;
*ptr = '\0';
if (isspace((*p)&255) || !*p || *p == '>')
buf[0] = '\0';
else
{
if (*p == '=')
p ++;
for (ptr = buf; *p && !isspace((*p)&255) && *p != '>';)
if (*p == '\'' || *p == '\"')
{
quote = *p++;
while (*p && *p != quote)
if ((ptr - buf + 1) < bufsize)
*ptr++ = *p++;
else
p ++;
if (*p == quote)
p ++;
}
else if ((ptr - buf + 1) < bufsize)
*ptr++ = *p++;
else
p ++;
*ptr = '\0';
}
if (strcasecmp(n, name) == 0)
return (buf);
else
buf[0] = '\0';
if (*p == '>')
return (NULL);
}
return (NULL);
}
/** Gets a color attribute. */
Fl_Color // O - Color value
Fl_Help_View::get_color(const char *n, // I - Color name
Fl_Color c) // I - Default color value
{
int i; // Looping var
int rgb, r, g, b; // RGB values
static const struct { // Color name table
const char *name;
int r, g, b;
} colors[] = {
{ "black", 0x00, 0x00, 0x00 },
{ "red", 0xff, 0x00, 0x00 },
{ "green", 0x00, 0x80, 0x00 },
{ "yellow", 0xff, 0xff, 0x00 },
{ "blue", 0x00, 0x00, 0xff },
{ "magenta", 0xff, 0x00, 0xff },
{ "fuchsia", 0xff, 0x00, 0xff },
{ "cyan", 0x00, 0xff, 0xff },
{ "aqua", 0x00, 0xff, 0xff },
{ "white", 0xff, 0xff, 0xff },
{ "gray", 0x80, 0x80, 0x80 },
{ "grey", 0x80, 0x80, 0x80 },
{ "lime", 0x00, 0xff, 0x00 },
{ "maroon", 0x80, 0x00, 0x00 },
{ "navy", 0x00, 0x00, 0x80 },
{ "olive", 0x80, 0x80, 0x00 },
{ "purple", 0x80, 0x00, 0x80 },
{ "silver", 0xc0, 0xc0, 0xc0 },
{ "teal", 0x00, 0x80, 0x80 }
};
if (!n || !n[0]) return c;
if (n[0] == '#') {
// Do hex color lookup
rgb = (int)strtol(n + 1, NULL, 16);
if (strlen(n) > 4) {
r = rgb >> 16;
g = (rgb >> 8) & 255;
b = rgb & 255;
} else {
r = (rgb >> 8) * 17;
g = ((rgb >> 4) & 15) * 17;
b = (rgb & 15) * 17;
}
return (fl_rgb_color((uchar)r, (uchar)g, (uchar)b));
} else {
for (i = 0; i < (int)(sizeof(colors) / sizeof(colors[0])); i ++)
if (!strcasecmp(n, colors[i].name)) {
return fl_rgb_color(colors[i].r, colors[i].g, colors[i].b);
}
return c;
}
}
/** Gets an inline image.
The image reference count is maintained accordingly, such that
the image can be released exactly once when the document is closed.
\return a pointer to a cached Fl_Shared_Image, if the image can be loaded,
otherwise a pointer to an internal Fl_Pixmap (broken_image).
\todo Fl_Help_View::get_image() returns a pointer to the internal
Fl_Pixmap broken_image, but this is _not_ compatible with the
return type Fl_Shared_Image (release() must not be called).
*/
/* Implementation note: (A.S. Apr 05, 2009)
Fl_Help_View::get_image() uses a static global flag (initial_load)
to determine, if it is called from the initial loading of a document
(load() or value()), or from resize() or draw().
A better solution would be to manage all loaded images in an own
structure like Fl_Help_Target (Fl_Help_Image ?) to avoid using this
global flag, but this would break the ABI !
This should be fixed in FLTK 1.3 !
If initial_load is true, then Fl_Shared_Image::get() is called to
load the image, and the reference count of the shared image is
increased by one.
If initial_load is false, then Fl_Shared_Image::find() is called to
load the image, and the image is released immediately. This avoids
increasing the reference count when calling get_image() from draw()
or resize().
Calling Fl_Shared_Image::find() instead of Fl_Shared_Image::get() avoids
doing unnecessary i/o for "broken images" within each resize/redraw.
Each image must be released exactly once in the destructor or before
a new document is loaded: see free_data().
*/
Fl_Shared_Image *
Fl_Help_View::get_image(const char *name, int W, int H) {
const char *localname; // Local filename
char dir[FL_PATH_MAX]; // Current directory
char temp[2 * FL_PATH_MAX], // Temporary filename
*tempptr; // Pointer into temporary name
Fl_Shared_Image *ip; // Image pointer...
// See if the image can be found...
if (strchr(directory_, ':') != NULL && strchr(name, ':') == NULL) {
if (name[0] == '/') {
strlcpy(temp, directory_, sizeof(temp));
if ((tempptr = strrchr(strchr(directory_, ':') + 3, '/')) != NULL) {
strlcpy(tempptr, name, sizeof(temp) - (tempptr - temp));
} else {
strlcat(temp, name, sizeof(temp));
}
} else {
snprintf(temp, sizeof(temp), "%s/%s", directory_, name);
}
if (link_) localname = (*link_)(this, temp);
else localname = temp;
} else if (name[0] != '/' && strchr(name, ':') == NULL) {
if (directory_[0]) snprintf(temp, sizeof(temp), "%s/%s", directory_, name);
else {
fl_getcwd(dir, sizeof(dir));
snprintf(temp, sizeof(temp), "file:%s/%s", dir, name);
}
if (link_) localname = (*link_)(this, temp);
else localname = temp;
} else if (link_) localname = (*link_)(this, name);
else localname = name;
if (!localname) return 0;
if (strncmp(localname, "file:", 5) == 0) localname += 5;
if (initial_load) {
if ((ip = Fl_Shared_Image::get(localname, W, H)) == NULL) {
ip = (Fl_Shared_Image *)&broken_image;
}
} else { // draw or resize
if ((ip = Fl_Shared_Image::find(localname, W, H)) == NULL) {
ip = (Fl_Shared_Image *)&broken_image;
} else {
ip->release();
}
}
return ip;
}
/** Gets a length value, either absolute or %. */
int
Fl_Help_View::get_length(const char *l) { // I - Value
int val; // Integer value
if (!l[0]) return 0;
val = atoi(l);
if (l[strlen(l) - 1] == '%') {
if (val > 100) val = 100;
else if (val < 0) val = 0;
int scrollsize = scrollbar_size_ ? scrollbar_size_ : Fl::scrollbar_size();
val = val * (hsize_ - scrollsize) / 100;
}
return val;
}
Fl_Help_Link *Fl_Help_View::find_link(int xx, int yy)
{
int i;
Fl_Help_Link *linkp;
for (i = nlinks_, linkp = links_; i > 0; i --, linkp ++) {
if (xx >= linkp->x && xx < linkp->w &&
yy >= linkp->y && yy < linkp->h)
break;
}
return i ? linkp : 0L;
}
void Fl_Help_View::follow_link(Fl_Help_Link *linkp)
{
char target[32]; // Current target
clear_selection();
strlcpy(target, linkp->name, sizeof(target));
set_changed();
if (strcmp(linkp->filename, filename_) != 0 && linkp->filename[0])
{
char dir[FL_PATH_MAX]; // Current directory
char temp[2 * FL_PATH_MAX], // Temporary filename
*tempptr; // Pointer into temporary filename
if (strchr(directory_, ':') != NULL &&
strchr(linkp->filename, ':') == NULL)
{
if (linkp->filename[0] == '/')
{
strlcpy(temp, directory_, sizeof(temp));
if ((tempptr = strrchr(strchr(directory_, ':') + 3, '/')) != NULL)
strlcpy(tempptr, linkp->filename, sizeof(temp));
else
strlcat(temp, linkp->filename, sizeof(temp));
}
else
snprintf(temp, sizeof(temp), "%s/%s", directory_, linkp->filename);
}
else if (linkp->filename[0] != '/' && strchr(linkp->filename, ':') == NULL)
{
if (directory_[0])
snprintf(temp, sizeof(temp), "%s/%s", directory_, linkp->filename);
else
{
fl_getcwd(dir, sizeof(dir));
snprintf(temp, sizeof(temp), "file:%s/%s", dir, linkp->filename);
}
}
else
strlcpy(temp, linkp->filename, sizeof(temp));
if (linkp->name[0])
snprintf(temp + strlen(temp), sizeof(temp) - strlen(temp), "#%s",
linkp->name);
load(temp);
}
else if (target[0])
topline(target);
else
topline(0);
leftline(0);
}
/** Removes the current text selection. */
void Fl_Help_View::clear_selection()
{
if (current_view==this)
clear_global_selection();
}
/** Selects all the text in the view. */
void Fl_Help_View::select_all()
{
clear_global_selection();
if (!value_) return;
current_view = this;
selection_drag_last = selection_last = (int) strlen(value_);
selected = 1;
}
void Fl_Help_View::clear_global_selection()
{
if (selected) redraw();
selection_push_first = selection_push_last = 0;
selection_drag_first = selection_drag_last = 0;
selection_first = selection_last = 0;
selected = 0;
}
char Fl_Help_View::begin_selection()
{
clear_global_selection();
if (!fl_help_view_buffer) fl_help_view_buffer = fl_create_offscreen(1, 1);
mouse_x = Fl::event_x();
mouse_y = Fl::event_y();
draw_mode = 1;
current_view = this;
fl_begin_offscreen(fl_help_view_buffer);
draw();
fl_end_offscreen();
draw_mode = 0;
if (selection_push_last) return 1;
else return 0;
}
char Fl_Help_View::extend_selection()
{
if (Fl::event_is_click())
return 0;
// printf("old selection_first=%d, selection_last=%d\n",
// selection_first, selection_last);
int sf = selection_first, sl = selection_last;
selected = 1;
mouse_x = Fl::event_x();
mouse_y = Fl::event_y();
draw_mode = 2;
fl_begin_offscreen(fl_help_view_buffer);
draw();
fl_end_offscreen();
draw_mode = 0;
if (selection_push_first < selection_drag_first) {
selection_first = selection_push_first;
} else {
selection_first = selection_drag_first;
}
if (selection_push_last > selection_drag_last) {
selection_last = selection_push_last;
} else {
selection_last = selection_drag_last;
}
// printf("new selection_first=%d, selection_last=%d\n",
// selection_first, selection_last);
if (sf!=selection_first || sl!=selection_last) {
// puts("REDRAW!!!\n");
return 1;
} else {
// puts("");
return 0;
}
}
// convert a command with up to four letters into an unsigned int
static unsigned int command(const char *cmd)
{
unsigned int ret = (tolower(cmd[0])<<24);
char c = cmd[1];
if (c=='>' || c==' ' || c==0) return ret;
ret |= (tolower(c)<<16);
c = cmd[2];
if (c=='>' || c==' ' || c==0) return ret;
ret |= (tolower(c)<<8);
c = cmd[3];
if (c=='>' || c==' ' || c==0) return ret;
ret |= tolower(c);
c = cmd[4];
if (c=='>' || c==' ' || c==0) return ret;
return 0;
}
#define CMD(a, b, c, d) ((a<<24)|(b<<16)|(c<<8)|d)
void Fl_Help_View::end_selection(int clipboard)
{
if (!selected || current_view!=this)
return;
// convert the select part of our html text into some kind of somewhat readable UTF-8
// and store it in the selection buffer
int p = 0;
char pre = 0;
int len = (int) strlen(value_);
char *txt = (char*)malloc(len+1), *d = txt;
const char *s = value_, *cmd, *src;
for (;;) {
int c = (*s++) & 0xff;
if (c==0) break;
if (c=='<') { // begin of some html command. Skip until we find a '>'
cmd = s;
for (;;) {
c = (*s++) & 0xff;
if (c==0 || c=='>') break;
}
if (c==0) break;
// do something with this command... .
// The replacement string must not be longer than the command
// itself plus '<' and '>'
src = 0;
switch (command(cmd)) {
case CMD('p','r','e', 0 ): pre = 1; break;
case CMD('/','p','r','e'): pre = 0; break;
case CMD('t','d', 0 , 0 ):
case CMD('p', 0 , 0 , 0 ):
case CMD('/','p', 0 , 0 ):
case CMD('b','r', 0 , 0 ): src = "\n"; break;
case CMD('l','i', 0 , 0 ): src = "\n * "; break;
case CMD('/','h','1', 0 ):
case CMD('/','h','2', 0 ):
case CMD('/','h','3', 0 ):
case CMD('/','h','4', 0 ):
case CMD('/','h','5', 0 ):
case CMD('/','h','6', 0 ): src = "\n\n"; break;
case CMD('t','r', 0 , 0 ):
case CMD('h','1', 0 , 0 ):
case CMD('h','2', 0 , 0 ):
case CMD('h','3', 0 , 0 ):
case CMD('h','4', 0 , 0 ):
case CMD('h','5', 0 , 0 ):
case CMD('h','6', 0 , 0 ): src = "\n\n"; break;
case CMD('d','t', 0 , 0 ): src = "\n "; break;
case CMD('d','d', 0 , 0 ): src = "\n - "; break;
}
int n = (int) (s-value_);
if (src && n>selection_first && n<=selection_last) {
while (*src) {
*d++ = *src++;
}
c = src[-1] & 0xff;
p = isspace(c) ? ' ' : c;
}
continue;
}
const char *s2 = s;
if (c=='&') { // special characters (HTML entities)
int xx = quote_char(s);
if (xx >= 0) {
c = xx;
for (;;) {
char cc = *s++;
if (!cc || cc==';') break;
}
}
}
int n = (int) (s2-value_);
if (n>selection_first && n<=selection_last) {
if (!pre && c < 256 && isspace(c)) c = ' ';
if (p != ' ' || c != ' ') {
if (s2 != s) { // c was an HTML entity
d += fl_utf8encode(c, d);
}
else *d++ = c;
}
p = c;
}
if (n>selection_last) break; // stop parsing html after end of selection
}
*d = 0;
Fl::copy(txt, (int) strlen(txt), clipboard);
// printf("copy [%s]\n", txt);
free(txt);
}
/** Handles events in the widget. */
int // O - 1 if we handled it, 0 otherwise
Fl_Help_View::handle(int event) // I - Event to handle
{
static Fl_Help_Link *linkp; // currently clicked link
int xx = Fl::event_x() - x() + leftline_;
int yy = Fl::event_y() - y() + topline_;
switch (event)
{
case FL_FOCUS:
redraw();
return 1;
case FL_UNFOCUS:
clear_selection();
redraw();
return 1;
case FL_ENTER :
Fl_Group::handle(event);
return 1;
case FL_LEAVE :
fl_cursor(FL_CURSOR_DEFAULT);
break;
case FL_MOVE:
if (find_link(xx, yy)) fl_cursor(FL_CURSOR_HAND);
else fl_cursor(FL_CURSOR_DEFAULT);
return 1;
case FL_PUSH:
if (Fl_Group::handle(event)) return 1;
linkp = find_link(xx, yy);
if (linkp) {
fl_cursor(FL_CURSOR_HAND);
return 1;
}
if (begin_selection()) {
fl_cursor(FL_CURSOR_INSERT);
return 1;
}
fl_cursor(FL_CURSOR_DEFAULT);
return 1;
case FL_DRAG:
if (linkp) {
if (Fl::event_is_click()) {
fl_cursor(FL_CURSOR_HAND);
} else {
fl_cursor(FL_CURSOR_DEFAULT); // should be "FL_CURSOR_CANCEL" if we had it
}
return 1;
}
if (current_view==this && selection_push_last) {
if (extend_selection()) redraw();
fl_cursor(FL_CURSOR_INSERT);
return 1;
}
fl_cursor(FL_CURSOR_DEFAULT);
return 1;
case FL_RELEASE:
if (linkp) {
if (Fl::event_is_click()) {
follow_link(linkp);
}
fl_cursor(FL_CURSOR_DEFAULT);
linkp = 0;
return 1;
}
if (current_view==this && selection_push_last) {
end_selection();
return 1;
}
return 1;
case FL_SHORTCUT: {
int mods = Fl::event_state() & (FL_META|FL_CTRL|FL_ALT|FL_SHIFT);
if ( mods == FL_COMMAND) {
switch ( Fl::event_key() ) {
case 'a': select_all(); redraw(); return 1;
case 'c':
case 'x': end_selection(1); return 1;
}
}
break; }
}
return (Fl_Group::handle(event));
}
/**
The constructor creates the Fl_Help_View widget at the specified
position and size.
*/
Fl_Help_View::Fl_Help_View(int xx, // I - Left position
int yy, // I - Top position
int ww, // I - Width in pixels
int hh, // I - Height in pixels
const char *l)
: Fl_Group(xx, yy, ww, hh, l),
scrollbar_(xx + ww - Fl::scrollbar_size(), yy,
Fl::scrollbar_size(), hh - Fl::scrollbar_size()),
hscrollbar_(xx, yy + hh - Fl::scrollbar_size(),
ww - Fl::scrollbar_size(), Fl::scrollbar_size())
{
color(FL_BACKGROUND2_COLOR, FL_SELECTION_COLOR);
title_[0] = '\0';
defcolor_ = FL_FOREGROUND_COLOR;
bgcolor_ = FL_BACKGROUND_COLOR;
textcolor_ = FL_FOREGROUND_COLOR;
linkcolor_ = FL_SELECTION_COLOR;
textfont_ = FL_TIMES;
textsize_ = 12;
value_ = NULL;
ablocks_ = 0;
nblocks_ = 0;
blocks_ = (Fl_Help_Block *)0;
link_ = (Fl_Help_Func *)0;
alinks_ = 0;
nlinks_ = 0;
links_ = (Fl_Help_Link *)0;
atargets_ = 0;
ntargets_ = 0;
targets_ = (Fl_Help_Target *)0;
directory_[0] = '\0';
filename_[0] = '\0';
topline_ = 0;
leftline_ = 0;
size_ = 0;
hsize_ = 0;
scrollbar_size_ = 0;
scrollbar_.value(0, hh, 0, 1);
scrollbar_.step(8.0);
scrollbar_.show();
scrollbar_.callback(scrollbar_callback);
hscrollbar_.value(0, ww, 0, 1);
hscrollbar_.step(8.0);
hscrollbar_.show();
hscrollbar_.callback(hscrollbar_callback);
hscrollbar_.type(FL_HORIZONTAL);
end();
resize(xx, yy, ww, hh);
}
/** Destroys the Fl_Help_View widget.
The destructor destroys the widget and frees all memory that has been
allocated for the current document.
*/
Fl_Help_View::~Fl_Help_View()
{
clear_selection();
free_data();
}
/** Loads the specified file.
This method loads the specified file or URL. The filename may end in a
\c \#name style target.
If the URL starts with \a ftp, \a http, \a https, \a ipp, \a mailto, or
\a news, followed by a colon, FLTK will use fl_open_uri() to show the
requested page in an external browser.
In all other cases, the URL is interpreted as a filename. The file is read and
displayed in this borwser. Note that MSWindows style backslashes are not
supported in the file name.
\param[in] f filename or URL
\return 0 on success, -1 on error
\see fl_open_uri()
*/
int Fl_Help_View::load(const char *f)
{
FILE *fp; // File to read from
long len; // Length of file
char *target; // Target in file
char *slash; // Directory separator
const char *localname; // Local filename
char error[2 * FL_PATH_MAX]; // Error buffer
char newname[FL_PATH_MAX]; // New filename buffer
// printf("load(%s)\n",f); fflush(stdout);
if (strncmp(f, "ftp:", 4) == 0 ||
strncmp(f, "http:", 5) == 0 ||
strncmp(f, "https:", 6) == 0 ||
strncmp(f, "ipp:", 4) == 0 ||
strncmp(f, "mailto:", 7) == 0 ||
strncmp(f, "news:", 5) == 0)
{
char urimsg[FL_PATH_MAX];
if ( fl_open_uri(f, urimsg, sizeof(urimsg)) == 0 ) {
clear_selection();
strlcpy(newname, f, sizeof(newname));
if ((target = strrchr(newname, '#')) != NULL)
*target++ = '\0';
if (link_)
localname = (*link_)(this, newname);
else
localname = filename_;
if (!localname)
return (0);
free_data();
strlcpy(filename_, newname, sizeof(filename_));
strlcpy(directory_, newname, sizeof(directory_));
// Note: We do not support Windows backslashes, since they are illegal
// in URLs...
if ((slash = strrchr(directory_, '/')) == NULL)
directory_[0] = '\0';
else if (slash > directory_ && slash[-1] != '/')
*slash = '\0';
snprintf(error, sizeof(error),
"<HTML><HEAD><TITLE>Error</TITLE></HEAD>"
"<BODY><H1>Error</H1>"
"<P>Unable to follow the link \"%s\" - "
"%s.</P></BODY>",
f, urimsg);
value(error);
return -1;
} else {
return 0;
}
}
clear_selection();
strlcpy(newname, f, sizeof(newname));
if ((target = strrchr(newname, '#')) != NULL)
*target++ = '\0';
if (link_)
localname = (*link_)(this, newname);
else
localname = filename_;
if (!localname)
return -1;
free_data();
strlcpy(filename_, newname, sizeof(filename_));
strlcpy(directory_, newname, sizeof(directory_));
// Note: We do not support Windows backslashes, since they are illegal
// in URLs...
if ((slash = strrchr(directory_, '/')) == NULL)
directory_[0] = '\0';
else if (slash > directory_ && slash[-1] != '/')
*slash = '\0';
if (strncmp(localname, "file:", 5) == 0)
localname += 5; // Adjust for local filename...
int ret = 0;
if ((fp = fl_fopen(localname, "rb")) != NULL)
{
fseek(fp, 0, SEEK_END);
len = ftell(fp);
rewind(fp);
value_ = (const char *)calloc(len + 1, 1);
if (fread((void *)value_, 1, len, fp)==0) { /* use default 0 */ }
fclose(fp);
}
else
{
snprintf(error, sizeof(error),
"<HTML><HEAD><TITLE>Error</TITLE></HEAD>"
"<BODY><H1>Error</H1>"
"<P>Unable to follow the link \"%s\" - "
"%s.</P></BODY>",
localname, strerror(errno));
value_ = fl_strdup(error);
ret = -1;
}
initial_load = 1;
format();
initial_load = 0;
if (target)
topline(target);
else
topline(0);
return ret;
}
/** Resizes the help widget. */
void
Fl_Help_View::resize(int xx, // I - New left position
int yy, // I - New top position
int ww, // I - New width
int hh) // I - New height
{
Fl_Boxtype b = box() ? box() : FL_DOWN_BOX;
// Box to draw...
Fl_Widget::resize(xx, yy, ww, hh);
int scrollsize = scrollbar_size_ ? scrollbar_size_ : Fl::scrollbar_size();
scrollbar_.resize(x() + w() - scrollsize - Fl::box_dw(b) + Fl::box_dx(b),
y() + Fl::box_dy(b), scrollsize, h() - scrollsize - Fl::box_dh(b));
hscrollbar_.resize(x() + Fl::box_dx(b),
y() + h() - scrollsize - Fl::box_dh(b) + Fl::box_dy(b),
w() - scrollsize - Fl::box_dw(b), scrollsize);
format();
}
/** Scrolls the text to the indicated position, given a named destination.
\param[in] n target name
*/
void
Fl_Help_View::topline(const char *n) // I - Target name
{
Fl_Help_Target key, // Target name key
*target; // Pointer to matching target
if (ntargets_ == 0)
return;
strlcpy(key.name, n, sizeof(key.name));
target = (Fl_Help_Target *)bsearch(&key, targets_, ntargets_, sizeof(Fl_Help_Target),
(compare_func_t)compare_targets);
if (target != NULL)
topline(target->y);
}
/** Scrolls the text to the indicated position, given a pixel line.
If the given pixel value \p top is out of range, then the text is
scrolled to the top or bottom of the document, resp.
\param[in] top top line number in pixels (0 = start of document)
*/
void
Fl_Help_View::topline(int top) // I - Top line number
{
if (!value_)
return;
int scrollsize = scrollbar_size_ ? scrollbar_size_ : Fl::scrollbar_size();
if (size_ < (h() - scrollsize) || top < 0)
top = 0;
else if (top > size_)
top = size_;
topline_ = top;
scrollbar_.value(topline_, h() - scrollsize, 0, size_);
do_callback(FL_REASON_DRAGGED);
redraw();
}
/** Scrolls the text to the indicated position, given a pixel column.
If the given pixel value \p left is out of range, then the text is
scrolled to the left or right side of the document, resp.
\param[in] left left column number in pixels (0 = left side)
*/
void
Fl_Help_View::leftline(int left) // I - Left position
{
if (!value_)
return;
int scrollsize = scrollbar_size_ ? scrollbar_size_ : Fl::scrollbar_size();
if (hsize_ < (w() - scrollsize) || left < 0)
left = 0;
else if (left > hsize_)
left = hsize_;
leftline_ = left;
hscrollbar_.value(leftline_, w() - scrollsize, 0, hsize_);
redraw();
}
/** Sets the current help text buffer to the string provided and reformats the text.
The provided character string \p val is copied internally and will be
freed when value() is called again, or when the widget is destroyed.
If \p val is NULL, then the widget is cleared.
*/
void
Fl_Help_View::value(const char *val) // I - Text to view
{
clear_selection();
free_data();
set_changed();
if (!val)
return;
value_ = fl_strdup(val);
initial_load = 1;
format();
initial_load = 0;
topline(0);
leftline(0);
}
/* Returns the Unicode Code Point associated with a quoted character
(aka "HTML Entity").
Possible encoding formats:
- &name; named entity
- &#nn..; numeric (decimal) Unicode Code Point
- &#xnn..; numeric (hexadecimal) Unicode Code Point
- &#Xnn..; numeric (hexadecimal) Unicode Code Point
'nn..' = decimal or hexadecimal number, resp.
Contents of the table names[] below:
All printable ASCII (32-126) and ISO-8859-1 (160-255) characters
are encoded with the same value in Unicode. Special characters
outside the range [0-255] are encoded with their Unicode Code Point
as hexadecimal constants. Example:
- Euro sign: (Unicode) U+20ac = (hex) 0x20ac
Note: Converted to correct Unicode values and tested (compared with
the display of Firefox). AlbrechtS, 14 Feb. 2016.
Note to devs: if you add or remove items to/from this list, please
update the documentation in FL/Fl_Help_View.H.
*/
static int // O - Code or -1 on error
quote_char(const char *p) { // I - Quoted string
int i; // Looping var
static const struct {
const char *name;
int namelen;
int code;
} *nameptr, // Pointer into name array
names[] = { // Quoting names
{ "Aacute;", 7, 193 },
{ "aacute;", 7, 225 },
{ "Acirc;", 6, 194 },
{ "acirc;", 6, 226 },
{ "acute;", 6, 180 },
{ "AElig;", 6, 198 },
{ "aelig;", 6, 230 },
{ "Agrave;", 7, 192 },
{ "agrave;", 7, 224 },
{ "amp;", 4, '&' },
{ "Aring;", 6, 197 },
{ "aring;", 6, 229 },
{ "Atilde;", 7, 195 },
{ "atilde;", 7, 227 },
{ "Auml;", 5, 196 },
{ "auml;", 5, 228 },
{ "brvbar;", 7, 166 },
{ "bull;", 5, 0x2022 },
{ "Ccedil;", 7, 199 },
{ "ccedil;", 7, 231 },
{ "cedil;", 6, 184 },
{ "cent;", 5, 162 },
{ "copy;", 5, 169 },
{ "curren;", 7, 164 },
{ "dagger;", 7, 0x2020 },
{ "deg;", 4, 176 },
{ "divide;", 7, 247 },
{ "Eacute;", 7, 201 },
{ "eacute;", 7, 233 },
{ "Ecirc;", 6, 202 },
{ "ecirc;", 6, 234 },
{ "Egrave;", 7, 200 },
{ "egrave;", 7, 232 },
{ "ETH;", 4, 208 },
{ "eth;", 4, 240 },
{ "Euml;", 5, 203 },
{ "euml;", 5, 235 },
{ "euro;", 5, 0x20ac },
{ "frac12;", 7, 189 },
{ "frac14;", 7, 188 },
{ "frac34;", 7, 190 },
{ "gt;", 3, '>' },
{ "Iacute;", 7, 205 },
{ "iacute;", 7, 237 },
{ "Icirc;", 6, 206 },
{ "icirc;", 6, 238 },
{ "iexcl;", 6, 161 },
{ "Igrave;", 7, 204 },
{ "igrave;", 7, 236 },
{ "iquest;", 7, 191 },
{ "Iuml;", 5, 207 },
{ "iuml;", 5, 239 },
{ "laquo;", 6, 171 },
{ "lt;", 3, '<' },
{ "macr;", 5, 175 },
{ "micro;", 6, 181 },
{ "middot;", 7, 183 },
{ "nbsp;", 5, ' ' },
{ "ndash;", 6, 0x2013 },
{ "not;", 4, 172 },
{ "Ntilde;", 7, 209 },
{ "ntilde;", 7, 241 },
{ "Oacute;", 7, 211 },
{ "oacute;", 7, 243 },
{ "Ocirc;", 6, 212 },
{ "ocirc;", 6, 244 },
{ "Ograve;", 7, 210 },
{ "ograve;", 7, 242 },
{ "ordf;", 5, 170 },
{ "ordm;", 5, 186 },
{ "Oslash;", 7, 216 },
{ "oslash;", 7, 248 },
{ "Otilde;", 7, 213 },
{ "otilde;", 7, 245 },
{ "Ouml;", 5, 214 },
{ "ouml;", 5, 246 },
{ "para;", 5, 182 },
{ "permil;", 7, 0x2030 },
{ "plusmn;", 7, 177 },
{ "pound;", 6, 163 },
{ "quot;", 5, '\"' },
{ "raquo;", 6, 187 },
{ "reg;", 4, 174 },
{ "sect;", 5, 167 },
{ "shy;", 4, 173 },
{ "sup1;", 5, 185 },
{ "sup2;", 5, 178 },
{ "sup3;", 5, 179 },
{ "szlig;", 6, 223 },
{ "THORN;", 6, 222 },
{ "thorn;", 6, 254 },
{ "times;", 6, 215 },
{ "trade;", 6, 0x2122 },
{ "Uacute;", 7, 218 },
{ "uacute;", 7, 250 },
{ "Ucirc;", 6, 219 },
{ "ucirc;", 6, 251 },
{ "Ugrave;", 7, 217 },
{ "ugrave;", 7, 249 },
{ "uml;", 4, 168 },
{ "Uuml;", 5, 220 },
{ "uuml;", 5, 252 },
{ "Yacute;", 7, 221 },
{ "yacute;", 7, 253 },
{ "yen;", 4, 165 },
{ "Yuml;", 5, 0x0178 },
{ "yuml;", 5, 255 }
};
if (!strchr(p, ';')) return -1;
if (*p == '#') {
if (*(p+1) == 'x' || *(p+1) == 'X') return (int)strtol(p+2, NULL, 16);
else return atoi(p+1);
}
for (i = (int)(sizeof(names) / sizeof(names[0])), nameptr = names; i > 0; i --, nameptr ++)
if (strncmp(p, nameptr->name, nameptr->namelen) == 0)
return nameptr->code;
return -1;
}
/** The vertical scrollbar callback. */
static void
scrollbar_callback(Fl_Widget *s, void *)
{
((Fl_Help_View *)(s->parent()))->topline(int(((Fl_Scrollbar*)s)->value()));
}
/** The horizontal scrollbar callback. */
static void
hscrollbar_callback(Fl_Widget *s, void *)
{
((Fl_Help_View *)(s->parent()))->leftline(int(((Fl_Scrollbar*)s)->value()));
}
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