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fltk/fluid/file.cxx

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//
// Fluid file routines for the Fast Light Tool Kit (FLTK).
//
// You may find the basic read_* and write_* routines to
// be useful for other programs. I have used them many times.
// They are somewhat similar to tcl, using matching { and }
// to quote strings.
//
// Copyright 1998-2021 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
//
#include "file.h"
#include "fluid.h"
#include "factory.h"
#include "Fl_Function_Type.h"
#include "Fl_Widget_Type.h"
#include "Fl_Window_Type.h"
#include "alignment_panel.h"
#include "widget_browser.h"
#include "shell_command.h"
#include "code.h"
#include <FL/Fl.H>
#include <FL/Fl_Group.H>
#include <FL/fl_string_functions.h>
#include <FL/fl_message.H>
#include "../src/flstring.h"
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
/// \defgroup flfile .fl Design File Operations
/// \{
// This file contains code to read and write .fl files.
// TODO: there is a name confusion with routines that write to the C and Header
// TODO: files vs. those that write to the .fl file which should be fixed.
static FILE *fout;
static FILE *fin;
static int needspace;
static int lineno;
static const char *fname;
int fdesign_flip;
int fdesign_magic;
double read_version;
////////////////////////////////////////////////////////////////
// BASIC FILE WRITING:
/**
Open teh .fl design file for writing.
If the filename is NULL, associate stdout instead.
\param[in] s the filename or NULL for stdout
\return 1 if successful. 0 if the operation failed
*/
static int open_write(const char *s) {
if (!s) {fout = stdout; return 1;}
FILE *f = fl_fopen(s,"w");
if (!f) return 0;
fout = f;
return 1;
}
/**
Close the .fl design file.
Don't close, if data was sent to stdout.
*/
static int close_write() {
if (fout != stdout) {
int x = fclose(fout);
fout = stdout;
return x >= 0;
}
return 1;
}
/**
Write a string to the .fl file, quoting characters if necessary.
*/
void write_word(const char *w) {
if (needspace) putc(' ', fout);
needspace = 1;
if (!w || !*w) {fprintf(fout,"{}"); return;}
const char *p;
// see if it is a single word:
for (p = w; is_id(*p); p++) ;
if (!*p) {fprintf(fout,"%s",w); return;}
// see if there are matching braces:
int n = 0;
for (p = w; *p; p++) {
if (*p == '{') n++;
else if (*p == '}') {n--; if (n<0) break;}
}
int mismatched = (n != 0);
// write out brace-quoted string:
putc('{', fout);
for (; *w; w++) {
switch (*w) {
case '{':
case '}':
if (!mismatched) break;
case '\\':
case '#':
putc('\\',fout);
break;
}
putc(*w,fout);
}
putc('}', fout);
}
/**
Write an arbitrary formatted word to the .fl file, or a comment, etc .
If needspace is set, then one space is written before the string
unless the format starts with a newline character \\n.
*/
void write_string(const char *format, ...) {
va_list args;
va_start(args, format);
if (needspace && *format != '\n') fputc(' ',fout);
vfprintf(fout, format, args);
va_end(args);
needspace = !isspace(format[strlen(format)-1] & 255);
}
/**
Start a new line in the .fl file and indent it for a given nesting level.
*/
void write_indent(int n) {
fputc('\n',fout);
while (n--) {fputc(' ',fout); fputc(' ',fout);}
needspace = 0;
}
/**
Write a '{' to the .fl file at the given indenting level.
*/
void write_open(int) {
if (needspace) fputc(' ',fout);
fputc('{',fout);
needspace = 0;
}
/**
Write a '}' to the .fl file at the given indenting level.
*/
void write_close(int n) {
if (needspace) write_indent(n);
fputc('}',fout);
needspace = 1;
}
////////////////////////////////////////////////////////////////
// BASIC FILE READING:
/**
Open an .fl file for reading.
\param[in] s filename, if NULL, read from stdin instead
\return 0 if the operation failed, 1 if it succeeded
*/
static int open_read(const char *s) {
lineno = 1;
if (!s) {fin = stdin; fname = "stdin"; return 1;}
FILE *f = fl_fopen(s,"r");
if (!f) return 0;
fin = f;
fname = s;
return 1;
}
/**
Close the .fl file.
\return 0 if the operation failed, 1 if it succeeded
*/
static int close_read() {
if (fin != stdin) {
int x = fclose(fin);
fin = 0;
return x >= 0;
}
return 1;
}
/**
Display an error while reading the file.
If the .fl file isn't opened for reading, pop up an FLTK dialog, otherwise
print to stdout.
\note Matt: I am not sure why it is done this way. Shouldn;t this depend on \c batch_mode?
*/
void read_error(const char *format, ...) {
va_list args;
va_start(args, format);
if (!fin) {
char buffer[1024];
vsnprintf(buffer, sizeof(buffer), format, args);
fl_message("%s", buffer);
} else {
fprintf(stderr, "%s:%d: ", fname, lineno);
vfprintf(stderr, format, args);
fprintf(stderr, "\n");
}
va_end(args);
}
/**
Convert a single ASCII char, assumed to be a hex digit, into its decimal value.
*/
static int hexdigit(int x) {
if (isdigit(x)) return x-'0';
if (isupper(x)) return x-'A'+10;
if (islower(x)) return x-'a'+10;
return 20;
}
/**
Convert an ASCII sequence form the \.fl file that starts with a \\ into a single character.
Conversion includes the common C style \\ characters like \\n, \\x## hex
values, and \\o### octal values.
*/
static int read_quoted() { // read whatever character is after a \ .
int c,d,x;
switch(c = fgetc(fin)) {
case '\n': lineno++; return -1;
case 'a' : return('\a');
case 'b' : return('\b');
case 'f' : return('\f');
case 'n' : return('\n');
case 'r' : return('\r');
case 't' : return('\t');
case 'v' : return('\v');
case 'x' : /* read hex */
for (c=x=0; x<3; x++) {
int ch = fgetc(fin);
d = hexdigit(ch);
if (d > 15) {ungetc(ch,fin); break;}
c = (c<<4)+d;
}
break;
default: /* read octal */
if (c<'0' || c>'7') break;
c -= '0';
for (x=0; x<2; x++) {
int ch = fgetc(fin);
d = hexdigit(ch);
if (d>7) {ungetc(ch,fin); break;}
c = (c<<3)+d;
}
break;
}
return(c);
}
static char *buffer;
static int buflen;
/**
A simple growing buffer.
Oh how I wish sometimes we would upgrade to modern C++.
*/
static void expand_buffer(int length) {
if (length >= buflen) {
if (!buflen) {
buflen = length+1;
buffer = (char*)malloc(buflen);
} else {
buflen = 2*buflen;
if (length >= buflen) buflen = length+1;
buffer = (char *)realloc((void *)buffer,buflen);
}
}
}
/**
Return a word read from the .fl file, or NULL at the EOF.
This will skip all comments (# to end of line), and evaluate
all \\xxx sequences and use \\ at the end of line to remove the newline.
A word is any one of:
- a continuous string of non-space chars except { and } and #
- everything between matching {...} (unless wantbrace != 0)
- the characters '{' and '}'
*/
const char *read_word(int wantbrace) {
int x;
// skip all the whitespace before it:
for (;;) {
x = getc(fin);
if (x < 0 && feof(fin)) { // eof
return 0;
} else if (x == '#') { // comment
do x = getc(fin); while (x >= 0 && x != '\n');
lineno++;
continue;
} else if (x == '\n') {
lineno++;
} else if (!isspace(x & 255)) {
break;
}
}
expand_buffer(100);
if (x == '{' && !wantbrace) {
// read in whatever is between braces
int length = 0;
int nesting = 0;
for (;;) {
x = getc(fin);
if (x<0) {read_error("Missing '}'"); break;}
else if (x == '#') { // embedded comment
do x = getc(fin); while (x >= 0 && x != '\n');
lineno++;
continue;
} else if (x == '\n') lineno++;
else if (x == '\\') {x = read_quoted(); if (x<0) continue;}
else if (x == '{') nesting++;
else if (x == '}') {if (!nesting--) break;}
buffer[length++] = x;
expand_buffer(length);
}
buffer[length] = 0;
return buffer;
} else if (x == '{' || x == '}') {
// all the punctuation is a word:
buffer[0] = x;
buffer[1] = 0;
return buffer;
} else {
// read in an unquoted word:
int length = 0;
for (;;) {
if (x == '\\') {x = read_quoted(); if (x<0) continue;}
else if (x<0 || isspace(x & 255) || x=='{' || x=='}' || x=='#') break;
buffer[length++] = x;
expand_buffer(length);
x = getc(fin);
}
ungetc(x, fin);
buffer[length] = 0;
return buffer;
}
}
////////////////////////////////////////////////////////////////
/**
Write an .fl design description file.
\param[in] filename create this file, and if it exists, overwrite it
\param[in] selected_only write only the selected nodes in the widget_tree. This
is used to implement copy and paste.
*/
int write_file(const char *filename, int selected_only) {
if (!open_write(filename)) return 0;
write_string("# data file for the Fltk User Interface Designer (fluid)\n"
"version %.4f",FL_VERSION);
if(!include_H_from_C)
write_string("\ndo_not_include_H_from_C");
if(use_FL_COMMAND)
write_string("\nuse_FL_COMMAND");
if (utf8_in_src)
write_string("\nutf8_in_src");
if (avoid_early_includes)
write_string("\navoid_early_includes");
if (i18n_type) {
write_string("\ni18n_type %d", i18n_type);
write_string("\ni18n_include"); write_word(i18n_include);
write_string("\ni18n_conditional"); write_word(i18n_conditional);
switch (i18n_type) {
case 1 : /* GNU gettext */
write_string("\ni18n_function"); write_word(i18n_function);
write_string("\ni18n_static_function"); write_word(i18n_static_function);
break;
case 2 : /* POSIX catgets */
if (i18n_file[0]) {
write_string("\ni18n_file");
write_word(i18n_file);
}
write_string("\ni18n_set"); write_word(i18n_set);
break;
}
}
if (!selected_only) {
write_string("\nheader_name"); write_word(header_file_name);
write_string("\ncode_name"); write_word(code_file_name);
#if 0
// https://github.com/fltk/fltk/issues/328
// Project wide settings require a redesign.
shell_settings_write();
if (shell_settings_windows.command) {
write_string("\nwin_shell_cmd"); write_word(shell_settings_windows.command);
write_string("\nwin_shell_flags"); write_string("%d", shell_settings_windows.flags);
}
if (shell_settings_linux.command) {
write_string("\nlinux_shell_cmd"); write_word(shell_settings_linux.command);
write_string("\nlinux_shell_flags"); write_string("%d", shell_settings_linux.flags);
}
if (shell_settings_macos.command) {
write_string("\nmac_shell_cmd"); write_word(shell_settings_macos.command);
write_string("\nmac_shell_flags"); write_string("%d", shell_settings_macos.flags);
}
#endif
}
for (Fl_Type *p = Fl_Type::first; p;) {
if (!selected_only || p->selected) {
p->write();
write_string("\n");
int q = p->level;
for (p = p->next; p && p->level > q; p = p->next) {/*empty*/}
} else {
p = p->next;
}
}
return close_write();
}
////////////////////////////////////////////////////////////////
// read all the objects out of the input file:
/**
Recursively read child nodes in the .fl design file.
If this is the first call, also read the global settings for this design.
\param[in] p parent node or NULL
\param[in] paste if set, merge into existing design, else replace design
\param[in] strategy add nodes after current or as last child
\param[in] skip_options this is set if the options were already found in
a previous call, and there is no need to waste time searchingg for them.
*/
static void read_children(Fl_Type *p, int paste, Strategy strategy, char skip_options=0) {
Fl_Type::current = p;
for (;;) {
const char *c = read_word();
REUSE_C:
if (!c) {
if (p && !paste) read_error("Missing '}'");
break;
}
if (!strcmp(c,"}")) {
if (!p) read_error("Unexpected '}'");
break;
}
// Make sure that we don;t go through the list of options for child nodes
if (!skip_options) {
// this is the first word in a .fd file:
if (!strcmp(c,"Magic:")) {
read_fdesign();
return;
}
if (!strcmp(c,"version")) {
c = read_word();
read_version = strtod(c,0);
if (read_version<=0 || read_version>double(FL_VERSION+0.00001))
read_error("unknown version '%s'",c);
continue;
}
// back compatibility with Vincent Penne's original class code:
if (!p && !strcmp(c,"define_in_struct")) {
Fl_Type *t = add_new_widget_from_file("class", kAddAsLastChild);
t->name(read_word());
Fl_Type::current = p = t;
paste = 1; // stops "missing }" error
continue;
}
if (!strcmp(c,"do_not_include_H_from_C")) {
include_H_from_C=0;
goto CONTINUE;
}
if (!strcmp(c,"use_FL_COMMAND")) {
use_FL_COMMAND=1;
goto CONTINUE;
}
if (!strcmp(c,"utf8_in_src")) {
utf8_in_src=1;
goto CONTINUE;
}
if (!strcmp(c,"avoid_early_includes")) {
avoid_early_includes=1;
goto CONTINUE;
}
if (!strcmp(c,"i18n_type")) {
i18n_type = atoi(read_word());
goto CONTINUE;
}
if (!strcmp(c,"i18n_function")) {
i18n_function = fl_strdup(read_word());
goto CONTINUE;
}
if (!strcmp(c,"i18n_static_function")) {
i18n_static_function = fl_strdup(read_word());
goto CONTINUE;
}
if (!strcmp(c,"i18n_file")) {
i18n_file = fl_strdup(read_word());
goto CONTINUE;
}
if (!strcmp(c,"i18n_set")) {
i18n_set = fl_strdup(read_word());
goto CONTINUE;
}
if (!strcmp(c,"i18n_include")) {
i18n_include = fl_strdup(read_word());
goto CONTINUE;
}
if (!strcmp(c,"i18n_conditional")) {
i18n_conditional = fl_strdup(read_word());
goto CONTINUE;
}
if (!strcmp(c,"i18n_type"))
{
i18n_type = atoi(read_word());
goto CONTINUE;
}
if (!strcmp(c,"header_name")) {
if (!header_file_set) header_file_name = fl_strdup(read_word());
else read_word();
goto CONTINUE;
}
if (!strcmp(c,"code_name")) {
if (!code_file_set) code_file_name = fl_strdup(read_word());
else read_word();
goto CONTINUE;
}
if (!strcmp(c, "snap") || !strcmp(c, "gridx") || !strcmp(c, "gridy")) {
// grid settings are now global
read_word();
goto CONTINUE;
}
if (strcmp(c, "win_shell_cmd")==0) {
if (shell_settings_windows.command)
free((void*)shell_settings_windows.command);
shell_settings_windows.command = fl_strdup(read_word());
goto CONTINUE;
} else if (strcmp(c, "win_shell_flags")==0) {
shell_settings_windows.flags = atoi(read_word());
goto CONTINUE;
} else if (strcmp(c, "linux_shell_cmd")==0) {
if (shell_settings_linux.command)
free((void*)shell_settings_linux.command);
shell_settings_linux.command = fl_strdup(read_word());
goto CONTINUE;
} else if (strcmp(c, "linux_shell_flags")==0) {
shell_settings_linux.flags = atoi(read_word());
goto CONTINUE;
} else if (strcmp(c, "mac_shell_cmd")==0) {
if (shell_settings_macos.command)
free((void*)shell_settings_macos.command);
shell_settings_macos.command = fl_strdup(read_word());
goto CONTINUE;
} else if (strcmp(c, "mac_shell_flags")==0) {
shell_settings_macos.flags = atoi(read_word());
goto CONTINUE;
}
}
{
Fl_Type *t = add_new_widget_from_file(c, strategy);
if (!t) {
read_error("Unknown word \"%s\"", c);
continue;
}
// After reading the first widget, we no longer need to look for options
skip_options = 1;
t->name(read_word());
c = read_word(1);
if (strcmp(c,"{") && t->is_class()) { // <prefix> <name>
((Fl_Class_Type*)t)->prefix(t->name());
t->name(c);
c = read_word(1);
}
if (strcmp(c,"{")) {
read_error("Missing property list for %s\n",t->title());
goto REUSE_C;
}
t->open_ = 0;
for (;;) {
const char *cc = read_word();
if (!cc || !strcmp(cc,"}")) break;
t->read_property(cc);
}
if (!t->is_parent()) continue;
c = read_word(1);
if (strcmp(c,"{")) {
read_error("Missing child list for %s\n",t->title());
goto REUSE_C;
}
read_children(t, 0, strategy, skip_options);
}
Fl_Type::current = p;
CONTINUE:;
}
}
/**
Read a .fl design file.
\param[in] filename read this file
\param[in] merge if this is set, merge the file into an existing design
at Fl_Type::current
\param[in] strategy add new nodes after current or as last child
\return 0 if the operation failed, 1 if it succeeded
*/
int read_file(const char *filename, int merge, Strategy strategy) {
Fl_Type *o;
read_version = 0.0;
if (!open_read(filename))
return 0;
if (merge)
deselect();
else
delete_all();
read_children(Fl_Type::current, merge, strategy);
Fl_Type::current = 0;
// Force menu items to be rebuilt...
for (o = Fl_Type::first; o; o = o->next)
if (o->is_menu_button())
o->add_child(0,0);
for (o = Fl_Type::first; o; o = o->next)
if (o->selected) {
Fl_Type::current = o;
break;
}
selection_changed(Fl_Type::current);
shell_settings_read();
return close_read();
}
////////////////////////////////////////////////////////////////
// Read Forms and XForms fdesign files:
static int read_fdesign_line(const char*& name, const char*& value) {
int length = 0;
int x;
// find a colon:
for (;;) {
x = getc(fin);
if (x < 0 && feof(fin)) return 0;
if (x == '\n') {length = 0; continue;} // no colon this line...
if (!isspace(x & 255)) {
buffer[length++] = x;
expand_buffer(length);
}
if (x == ':') break;
}
int valueoffset = length;
buffer[length-1] = 0;
// skip to start of value:
for (;;) {
x = getc(fin);
if ((x < 0 && feof(fin)) || x == '\n' || !isspace(x & 255)) break;
}
// read the value:
for (;;) {
if (x == '\\') {x = read_quoted(); if (x<0) continue;}
else if (x == '\n') break;
buffer[length++] = x;
expand_buffer(length);
x = getc(fin);
}
buffer[length] = 0;
name = buffer;
value = buffer+valueoffset;
return 1;
}
static const char *class_matcher[] = {
"FL_CHECKBUTTON", "Fl_Check_Button",
"FL_ROUNDBUTTON", "Fl_Round_Button",
"FL_ROUND3DBUTTON", "Fl_Round_Button",
"FL_LIGHTBUTTON", "Fl_Light_Button",
"FL_FRAME", "Fl_Box",
"FL_LABELFRAME", "Fl_Box",
"FL_TEXT", "Fl_Box",
"FL_VALSLIDER", "Fl_Value_Slider",
"FL_MENU", "Fl_Menu_Button",
"3", "FL_BITMAP",
"1", "FL_BOX",
"71","FL_BROWSER",
"11","FL_BUTTON",
"4", "FL_CHART",
"42","FL_CHOICE",
"61","FL_CLOCK",
"25","FL_COUNTER",
"22","FL_DIAL",
"101","FL_FREE",
"31","FL_INPUT",
"12","Fl_Light_Button",
"41","FL_MENU",
"23","FL_POSITIONER",
"13","Fl_Round_Button",
"21","FL_SLIDER",
"2", "FL_BOX", // was FL_TEXT
"62","FL_TIMER",
"24","Fl_Value_Slider",
0};
/**
Finish a group of widgets and optionally transform its children's coordinates.
Implements the same functionality as Fl_Group::forms_end() from the forms
compatibility library would have done:
- resize the group to surround its children if the group's w() == 0
- optionally flip the \p y coordinates of all children relative to the group's window
- Fl_Group::end() the group
\note Copied from forms_compatibility.cxx and modified as a static fluid
function so we don't have to link to fltk_forms.
\param[in] g the Fl_Group widget
\param[in] flip flip children's \p y coordinates if true (non-zero)
*/
static void forms_end(Fl_Group *g, int flip) {
// set the dimensions of a group to surround its contents
const int nc = g->children();
if (nc && !g->w()) {
Fl_Widget*const* a = g->array();
Fl_Widget* o = *a++;
int rx = o->x();
int ry = o->y();
int rw = rx+o->w();
int rh = ry+o->h();
for (int i = nc - 1; i--;) {
o = *a++;
if (o->x() < rx) rx = o->x();
if (o->y() < ry) ry = o->y();
if (o->x() + o->w() > rw) rw = o->x() + o->w();
if (o->y() + o->h() > rh) rh = o->y() + o->h();
}
g->Fl_Widget::resize(rx, ry, rw-rx, rh-ry);
}
// flip all the children's coordinate systems:
if (nc && flip) {
Fl_Widget* o = (g->as_window()) ? g : g->window();
int Y = o->h();
Fl_Widget*const* a = g->array();
for (int i = nc; i--;) {
Fl_Widget* ow = *a++;
int newy = Y - ow->y() - ow->h();
ow->Fl_Widget::resize(ow->x(), newy, ow->w(), ow->h());
}
}
g->end();
}
/**
Read a XForms design file.
.fl and .fd file start with the same header. Fluid can recognize .fd XForms
Design files by a magic number. It will read them and map XForms widgets onto
FLTK widgets.
\see http://xforms-toolkit.org
*/
void read_fdesign() {
fdesign_magic = atoi(read_word());
fdesign_flip = (fdesign_magic < 13000);
Fl_Widget_Type *window = 0;
Fl_Widget_Type *group = 0;
Fl_Widget_Type *widget = 0;
if (!Fl_Type::current) {
Fl_Type *t = add_new_widget_from_file("Function", kAddAsLastChild);
t->name("create_the_forms()");
Fl_Type::current = t;
}
for (;;) {
const char *name;
const char *value;
if (!read_fdesign_line(name, value)) break;
if (!strcmp(name,"Name")) {
window = (Fl_Widget_Type*)add_new_widget_from_file("Fl_Window", kAddAsLastChild);
window->name(value);
window->label(value);
Fl_Type::current = widget = window;
} else if (!strcmp(name,"class")) {
if (!strcmp(value,"FL_BEGIN_GROUP")) {
group = widget = (Fl_Widget_Type*)add_new_widget_from_file("Fl_Group", kAddAsLastChild);
Fl_Type::current = group;
} else if (!strcmp(value,"FL_END_GROUP")) {
if (group) {
Fl_Group* g = (Fl_Group*)(group->o);
g->begin();
forms_end(g, fdesign_flip);
Fl_Group::current(0);
}
group = widget = 0;
Fl_Type::current = window;
} else {
for (int i = 0; class_matcher[i]; i += 2)
if (!strcmp(value,class_matcher[i])) {
value = class_matcher[i+1]; break;}
widget = (Fl_Widget_Type*)add_new_widget_from_file(value, kAddAsLastChild);
if (!widget) {
printf("class %s not found, using Fl_Button\n", value);
widget = (Fl_Widget_Type*)add_new_widget_from_file("Fl_Button", kAddAsLastChild);
}
}
} else if (widget) {
if (!widget->read_fdesign(name, value))
printf("Ignoring \"%s: %s\"\n", name, value);
}
}
}
/// \}
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