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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 1998-2024 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 "CodeEditor.h"
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <ctype.h>
-
-// ---- CodeEditor implementation
-
-/**
- Lookup table for all supported styles.
- Every table entry describes a rendering style for the corresponding text.
- */
-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
- };
-
-/**
- Parse text and produce style data.
- \param[in] in_tbuff text buffer to parse
- \param[inout] in_sbuff style buffer we modify
- \param[in] in_len byte length to parse
- \param[in] in_style starting style letter
- */
-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;
- }
- }
-}
-
-/**
- Update unfinished styles.
- */
-void CodeEditor::style_unfinished_cb(int, void*) {
-}
-
-/**
- Update the style buffer.
- \param[in] pos insert position in text
- \param[in] nInserted number of bytes inserted
- \param[in] nDeleted number of bytes deleted
- \param[in] cbArg pointer back to the code editor
- */
-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);
-}
-
-/**
- Find the right indentation depth after pressing the Enter key.
- \param[in] e pointer back to the code editor
- */
-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
- size_t 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(FL_REASON_CHANGED);
-
- free(text);
-
- return 1;
-}
-
-/**
- Create a CodeEditor widget.
- \param[in] X, Y, W, H position and size of the widget
- \param[in] L optional label
- */
-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;
-}
-
-/**
- Attempt to make the fluid code editor widget honor textsize setting.
- This works by updating the fontsizes in the style table.
- \param[in] s the new general height of the text font
- */
-void CodeEditor::textsize(Fl_Fontsize s) {
- Fl_Text_Editor::textsize(s); // call base class method
- // now attempt to update our styletable to honor the new size...
- int entries = sizeof(styletable) / sizeof(styletable[0]);
- for(int iter = 0; iter < entries; iter++) {
- styletable[iter].size = s;
- }
-} // textsize
-
-// ---- CodeViewer implementation
-
-/**
- Create a CodeViewer widget.
- \param[in] X, Y, W, H position and size of the widget
- \param[in] L optional label
- */
-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);
-}
-
-/**
- Tricking Fl_Text_Display into using bearable colors for this specific task.
- */
-void CodeViewer::draw()
-{
- 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);
-}
-
-// ---- TextViewer implementation
-
-/**
- Create a TextViewer widget.
- \param[in] X, Y, W, H position and size of the widget
- \param[in] L optional label
- */
-TextViewer::TextViewer(int X, int Y, int W, int H, const char *L)
-: Fl_Text_Display(X, Y, W, H, L)
-{
- buffer(new Fl_Text_Buffer);
-}
-
-/**
- Avoid memory leaks.
- */
-TextViewer::~TextViewer() {
- Fl_Text_Buffer *buf = mBuffer;
- buffer(0);
- delete buf;
-}
-
-/**
- Tricking Fl_Text_Display into using bearable colors for this specific task.
- */
-void TextViewer::draw()
-{
- 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));
- Fl_Text_Display::draw();
- Fl::set_color(FL_SELECTION_COLOR, c);
-}
-
-
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