317 lines
9.5 KiB
C++
317 lines
9.5 KiB
C++
//
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// Code editor widget for the Fast Light Tool Kit (FLTK).
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// Syntax highlighting rewritten by erco@seriss.com 09/15/20.
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//
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// Copyright 1998-2024 by Bill Spitzak and others.
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//
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// This library is free software. Distribution and use rights are outlined in
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// the file "COPYING" which should have been included with this file. If this
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// file is missing or damaged, see the license at:
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//
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// https://www.fltk.org/COPYING.php
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//
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// Please see the following page on how to report bugs and issues:
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//
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// https://www.fltk.org/bugs.php
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//
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//
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// Include necessary headers...
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//
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#include "CodeEditor.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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// ---- CodeEditor implementation
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/**
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Lookup table for all supported styles.
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Every table entry describes a rendering style for the corresponding text.
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*/
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Fl_Text_Display::Style_Table_Entry CodeEditor::styletable[] = { // Style table
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{ FL_FOREGROUND_COLOR, FL_COURIER, 11 }, // A - Plain
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{ FL_DARK_GREEN, FL_COURIER_ITALIC, 11 }, // B - Line comments
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{ FL_DARK_GREEN, FL_COURIER_ITALIC, 11 }, // C - Block comments
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{ FL_BLUE, FL_COURIER, 11 }, // D - Strings
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{ FL_DARK_RED, FL_COURIER, 11 }, // E - Directives
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{ FL_DARK_RED, FL_COURIER_BOLD, 11 }, // F - Types
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{ FL_BLUE, FL_COURIER_BOLD, 11 }, // G - Keywords
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{ 220, /* med cyan */ FL_COURIER, 11 } // H - Single quote chars
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};
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/**
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Parse text and produce style data.
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\param[in] in_tbuff text buffer to parse
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\param[inout] in_sbuff style buffer we modify
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\param[in] in_len byte length to parse
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\param[in] in_style starting style letter
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*/
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void CodeEditor::style_parse(const char *in_tbuff, // text buffer to parse
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char *in_sbuff, // style buffer we modify
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int in_len, // byte length to parse
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char in_style) { // starting style letter
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// Style letters:
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//
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// 'A' - Plain
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// 'B' - Line comments // ..
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// 'C' - Block comments /*..*/
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// 'D' - Strings "xxx"
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// 'E' - Directives #define, #include..
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// 'F' - Types void, char..
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// 'G' - Keywords if, while..
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// 'H' - Chars 'x'
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StyleParse sp;
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sp.tbuff = in_tbuff;
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sp.sbuff = in_sbuff;
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sp.len = in_len;
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sp.style = in_style;
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sp.lwhite = 1; // 1:while parsing over leading white and first char past, 0:past white
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sp.col = 0;
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sp.last = 0;
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// Loop through the code, updating style buffer
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char c;
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while ( sp.len > 0 ) {
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c = sp.tbuff[0]; // current char
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if ( sp.style == 'C' ) { // Started in middle of comment block?
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if ( !sp.parse_block_comment() ) break;
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} else if ( strncmp(sp.tbuff, "/*", 2)==0 ) { // C style comment block?
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if ( !sp.parse_block_comment() ) break;
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} else if ( c == '\\' ) { // Backslash escape char?
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if ( !sp.parse_escape() ) break;
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} else if ( strncmp(sp.tbuff, "//", 2)==0 ) { // Line comment?
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if ( !sp.parse_line_comment() ) break;
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} else if ( c == '"' ) { // Start of double quoted string?
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if ( !sp.parse_quoted_string('"', 'D') ) break;
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} else if ( c == '\'' ) { // Start of single quoted string?
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if ( !sp.parse_quoted_string('\'', 'H') ) break;
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} else if ( c == '#' && sp.lwhite ) { // Start of '#' directive?
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if ( !sp.parse_directive() ) break;
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} else if ( !sp.last && (islower(c) || c == '_') ) { // Possible C/C++ keyword?
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if ( !sp.parse_keyword() ) break;
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} else { // All other chars?
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if ( !sp.parse_all_else() ) break;
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}
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}
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}
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/**
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Update unfinished styles.
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*/
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void CodeEditor::style_unfinished_cb(int, void*) {
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}
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/**
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Update the style buffer.
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\param[in] pos insert position in text
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\param[in] nInserted number of bytes inserted
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\param[in] nDeleted number of bytes deleted
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\param[in] cbArg pointer back to the code editor
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*/
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void CodeEditor::style_update(int pos, int nInserted, int nDeleted,
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int /*nRestyled*/, const char * /*deletedText*/,
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void *cbArg) {
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CodeEditor *editor = (CodeEditor*)cbArg;
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char *style, // Style data
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*text; // Text data
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// If this is just a selection change, just unselect the style buffer...
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if (nInserted == 0 && nDeleted == 0) {
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editor->mStyleBuffer->unselect();
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return;
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}
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// Track changes in the text buffer...
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if (nInserted > 0) {
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// Insert characters into the style buffer...
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style = new char[nInserted + 1];
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memset(style, 'A', nInserted);
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style[nInserted] = '\0';
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editor->mStyleBuffer->replace(pos, pos + nDeleted, style);
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delete[] style;
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} else {
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// Just delete characters in the style buffer...
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editor->mStyleBuffer->remove(pos, pos + nDeleted);
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}
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// Select the area that was just updated to avoid unnecessary
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// callbacks...
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editor->mStyleBuffer->select(pos, pos + nInserted - nDeleted);
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// Reparse whole buffer, don't get cute. Maybe optimize range later
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int len = editor->buffer()->length();
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text = editor->mBuffer->text_range(0, len);
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style = editor->mStyleBuffer->text_range(0, len);
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style_parse(text, style, editor->mBuffer->length(), 'A');
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editor->mStyleBuffer->replace(0, len, style);
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editor->redisplay_range(0, len);
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editor->redraw();
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free(text);
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free(style);
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}
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/**
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Find the right indentation depth after pressing the Enter key.
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\param[in] e pointer back to the code editor
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*/
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int CodeEditor::auto_indent(int, CodeEditor* e) {
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if (e->buffer()->selected()) {
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e->insert_position(e->buffer()->primary_selection()->start());
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e->buffer()->remove_selection();
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}
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int pos = e->insert_position();
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int start = e->line_start(pos);
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char *text = e->buffer()->text_range(start, pos);
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char *ptr;
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for (ptr = text; isspace(*ptr); ptr ++) {/*empty*/}
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*ptr = '\0';
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if (*text) {
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// use only a single 'insert' call to avoid redraw issues
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size_t n = strlen(text);
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char *b = (char*)malloc(n+2);
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*b = '\n';
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strcpy(b+1, text);
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e->insert(b);
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free(b);
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} else {
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e->insert("\n");
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}
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e->show_insert_position();
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e->set_changed();
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if (e->when()&FL_WHEN_CHANGED) e->do_callback(FL_REASON_CHANGED);
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free(text);
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return 1;
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}
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/**
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Create a CodeEditor widget.
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\param[in] X, Y, W, H position and size of the widget
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\param[in] L optional label
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*/
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CodeEditor::CodeEditor(int X, int Y, int W, int H, const char *L) :
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Fl_Text_Editor(X, Y, W, H, L) {
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buffer(new Fl_Text_Buffer);
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char *style = new char[mBuffer->length() + 1];
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char *text = mBuffer->text();
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memset(style, 'A', mBuffer->length());
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style[mBuffer->length()] = '\0';
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highlight_data(new Fl_Text_Buffer(mBuffer->length()), styletable,
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sizeof(styletable) / sizeof(styletable[0]),
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'A', style_unfinished_cb, this);
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style_parse(text, style, mBuffer->length(), 'A');
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mStyleBuffer->text(style);
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delete[] style;
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free(text);
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mBuffer->add_modify_callback(style_update, this);
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add_key_binding(FL_Enter, FL_TEXT_EDITOR_ANY_STATE,
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(Fl_Text_Editor::Key_Func)auto_indent);
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}
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/**
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Destroy a CodeEditor widget.
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*/
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CodeEditor::~CodeEditor() {
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Fl_Text_Buffer *buf = mStyleBuffer;
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mStyleBuffer = 0;
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delete buf;
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buf = mBuffer;
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buffer(0);
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delete buf;
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}
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/**
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Attempt to make the fluid code editor widget honor textsize setting.
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This works by updating the fontsizes in the style table.
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\param[in] s the new general height of the text font
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*/
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void CodeEditor::textsize(Fl_Fontsize s) {
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Fl_Text_Editor::textsize(s); // call base class method
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// now attempt to update our styletable to honor the new size...
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int entries = sizeof(styletable) / sizeof(styletable[0]);
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for(int iter = 0; iter < entries; iter++) {
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styletable[iter].size = s;
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}
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} // textsize
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// ---- CodeViewer implementation
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/**
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Create a CodeViewer widget.
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\param[in] X, Y, W, H position and size of the widget
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\param[in] L optional label
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*/
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CodeViewer::CodeViewer(int X, int Y, int W, int H, const char *L)
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: CodeEditor(X, Y, W, H, L)
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{
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default_key_function(kf_ignore);
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remove_all_key_bindings(&key_bindings);
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cursor_style(CARET_CURSOR);
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}
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/**
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Tricking Fl_Text_Display into using bearable colors for this specific task.
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*/
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void CodeViewer::draw()
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{
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Fl_Color c = Fl::get_color(FL_SELECTION_COLOR);
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Fl::set_color(FL_SELECTION_COLOR, fl_color_average(FL_BACKGROUND_COLOR, FL_FOREGROUND_COLOR, 0.9f));
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CodeEditor::draw();
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Fl::set_color(FL_SELECTION_COLOR, c);
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}
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// ---- TextViewer implementation
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/**
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Create a TextViewer widget.
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\param[in] X, Y, W, H position and size of the widget
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\param[in] L optional label
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*/
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TextViewer::TextViewer(int X, int Y, int W, int H, const char *L)
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: Fl_Text_Display(X, Y, W, H, L)
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{
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buffer(new Fl_Text_Buffer);
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}
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/**
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Avoid memory leaks.
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*/
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TextViewer::~TextViewer() {
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Fl_Text_Buffer *buf = mBuffer;
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buffer(0);
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delete buf;
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}
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/**
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Tricking Fl_Text_Display into using bearable colors for this specific task.
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*/
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void TextViewer::draw()
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{
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Fl_Color c = Fl::get_color(FL_SELECTION_COLOR);
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Fl::set_color(FL_SELECTION_COLOR, fl_color_average(FL_BACKGROUND_COLOR, FL_FOREGROUND_COLOR, 0.9f));
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Fl_Text_Display::draw();
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Fl::set_color(FL_SELECTION_COLOR, c);
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}
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