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//
// Code editor widget for the Fast Light Tool Kit (FLTK).
// Syntax highlighting rewritten by erco@seriss.com 09/15/20.
//
// Copyright 1998-2020 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 necessary headers...
//
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "CodeEditor.h"
Fl_Text_Display::Style_Table_Entry CodeEditor::
styletable[] = { // Style table
{ FL_FOREGROUND_COLOR, FL_COURIER, 11 }, // A - Plain
{ FL_DARK_GREEN, FL_COURIER_ITALIC, 11 }, // B - Line comments
{ FL_DARK_GREEN, FL_COURIER_ITALIC, 11 }, // C - Block comments
{ FL_BLUE, FL_COURIER, 11 }, // D - Strings
{ FL_DARK_RED, FL_COURIER, 11 }, // E - Directives
{ FL_DARK_RED, FL_COURIER_BOLD, 11 }, // F - Types
{ FL_BLUE, FL_COURIER_BOLD, 11 }, // G - Keywords
{ 220, /* med cyan */ FL_COURIER, 11 } // H - Single quote chars
};
// attempt to make the fluid code editor widget honour textsize setting
void CodeEditor::textsize(Fl_Fontsize s) {
Fl_Text_Editor::textsize(s); // call base class method
// now attempt to update our styletable to honour the new size...
int entries = sizeof(styletable) / sizeof(styletable[0]);
for(int iter = 0; iter < entries; iter++) {
styletable[iter].size = s;
}
} // textsize
// 'style_parse()' - Parse text and produce style data.
void CodeEditor::style_parse(const char *in_tbuff, // text buffer to parse
char *in_sbuff, // style buffer we modify
int in_len, // byte length to parse
char in_style) { // starting style letter
// Style letters:
//
// 'A' - Plain
// 'B' - Line comments // ..
// 'C' - Block comments /*..*/
// 'D' - Strings "xxx"
// 'E' - Directives #define, #include..
// 'F' - Types void, char..
// 'G' - Keywords if, while..
// 'H' - Chars 'x'
StyleParse sp;
sp.tbuff = in_tbuff;
sp.sbuff = in_sbuff;
sp.len = in_len;
sp.style = in_style;
sp.lwhite = 1; // 1:while parsing over leading white and first char past, 0:past white
sp.col = 0;
sp.last = 0;
// Loop through the code, updating style buffer
char c;
while ( sp.len > 0 ) {
c = sp.tbuff[0]; // current char
if ( sp.style == 'C' ) { // Started in middle of comment block?
if ( !sp.parse_block_comment() ) break;
} else if ( strncmp(sp.tbuff, "/*", 2)==0 ) { // C style comment block?
if ( !sp.parse_block_comment() ) break;
} else if ( c == '\\' ) { // Backslash escape char?
if ( !sp.parse_escape() ) break;
} else if ( strncmp(sp.tbuff, "//", 2)==0 ) { // Line comment?
if ( !sp.parse_line_comment() ) break;
} else if ( c == '"' ) { // Start of double quoted string?
if ( !sp.parse_quoted_string('"', 'D') ) break;
} else if ( c == '\'' ) { // Start of single quoted string?
if ( !sp.parse_quoted_string('\'', 'H') ) break;
} else if ( c == '#' && sp.lwhite ) { // Start of '#' directive?
if ( !sp.parse_directive() ) break;
} else if ( !sp.last && (islower(c) || c == '_') ) { // Possible C/C++ keyword?
if ( !sp.parse_keyword() ) break;
} else { // All other chars?
if ( !sp.parse_all_else() ) break;
}
}
}
// 'style_unfinished_cb()' - Update unfinished styles.
void CodeEditor::style_unfinished_cb(int, void*) { }
// 'style_update()' - Update the style buffer...
void CodeEditor::style_update(int pos, int nInserted, int nDeleted,
int /*nRestyled*/, const char * /*deletedText*/,
void *cbArg) {
CodeEditor *editor = (CodeEditor*)cbArg;
char *style, // Style data
*text; // Text data
// If this is just a selection change, just unselect the style buffer...
if (nInserted == 0 && nDeleted == 0) {
editor->mStyleBuffer->unselect();
return;
}
// Track changes in the text buffer...
if (nInserted > 0) {
// Insert characters into the style buffer...
style = new char[nInserted + 1];
memset(style, 'A', nInserted);
style[nInserted] = '\0';
editor->mStyleBuffer->replace(pos, pos + nDeleted, style);
delete[] style;
} else {
// Just delete characters in the style buffer...
editor->mStyleBuffer->remove(pos, pos + nDeleted);
}
// Select the area that was just updated to avoid unnecessary
// callbacks...
editor->mStyleBuffer->select(pos, pos + nInserted - nDeleted);
// Reparse whole buffer, don't get cute. Maybe optimize range later
int len = editor->buffer()->length();
text = editor->mBuffer->text_range(0, len);
style = editor->mStyleBuffer->text_range(0, len);
style_parse(text, style, editor->mBuffer->length(), 'A');
editor->mStyleBuffer->replace(0, len, style);
editor->redisplay_range(0, len);
editor->redraw();
free(text);
free(style);
}
int CodeEditor::auto_indent(int, CodeEditor* e) {
if (e->buffer()->selected()) {
e->insert_position(e->buffer()->primary_selection()->start());
e->buffer()->remove_selection();
}
int pos = e->insert_position();
int start = e->line_start(pos);
char *text = e->buffer()->text_range(start, pos);
char *ptr;
for (ptr = text; isspace(*ptr); ptr ++) {/*empty*/}
*ptr = '\0';
if (*text) {
// use only a single 'insert' call to avoid redraw issues
int n = strlen(text);
char *b = (char*)malloc(n+2);
*b = '\n';
strcpy(b+1, text);
e->insert(b);
free(b);
} else {
e->insert("\n");
}
e->show_insert_position();
e->set_changed();
if (e->when()&FL_WHEN_CHANGED) e->do_callback();
free(text);
return 1;
}
// Create a CodeEditor widget...
CodeEditor::CodeEditor(int X, int Y, int W, int H, const char *L) :
Fl_Text_Editor(X, Y, W, H, L) {
buffer(new Fl_Text_Buffer);
char *style = new char[mBuffer->length() + 1];
char *text = mBuffer->text();
memset(style, 'A', mBuffer->length());
style[mBuffer->length()] = '\0';
highlight_data(new Fl_Text_Buffer(mBuffer->length()), styletable,
sizeof(styletable) / sizeof(styletable[0]),
'A', style_unfinished_cb, this);
style_parse(text, style, mBuffer->length(), 'A');
mStyleBuffer->text(style);
delete[] style;
free(text);
mBuffer->add_modify_callback(style_update, this);
add_key_binding(FL_Enter, FL_TEXT_EDITOR_ANY_STATE,
(Fl_Text_Editor::Key_Func)auto_indent);
}
// Destroy a CodeEditor widget...
CodeEditor::~CodeEditor() {
Fl_Text_Buffer *buf = mStyleBuffer;
mStyleBuffer = 0;
delete buf;
buf = mBuffer;
buffer(0);
delete buf;
}
CodeViewer::CodeViewer(int X, int Y, int W, int H, const char *L)
: CodeEditor(X, Y, W, H, L)
{
default_key_function(kf_ignore);
remove_all_key_bindings(&key_bindings);
cursor_style(CARET_CURSOR);
}
void CodeViewer::draw()
{
// Tricking Fl_Text_Display into using bearable colors for this specific task
Fl_Color c = Fl::get_color(FL_SELECTION_COLOR);
Fl::set_color(FL_SELECTION_COLOR, fl_color_average(FL_BACKGROUND_COLOR, FL_FOREGROUND_COLOR, 0.9f));
CodeEditor::draw();
Fl::set_color(FL_SELECTION_COLOR, c);
}
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