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fltk/fluid/CodeEditor.cxx

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//
// "$Id$"
//
// Code editor widget for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2016 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:
//
// http://www.fltk.org/COPYING.php
//
// Please report all bugs and problems on the following page:
//
// http://www.fltk.org/str.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
};
const char * const CodeEditor::
code_keywords[] = { // Sorted list of C/C++ keywords...
"and",
"and_eq",
"asm",
"bitand",
"bitor",
"break",
"case",
"catch",
"compl",
"continue",
"default",
"delete",
"do",
"else",
"false",
"for",
"goto",
"if",
"new",
"not",
"not_eq",
"operator",
"or",
"or_eq",
"return",
"switch",
"template",
"this",
"throw",
"true",
"try",
"while",
"xor",
"xor_eq"
};
const char * const CodeEditor::
code_types[] = { // Sorted list of C/C++ types...
"auto",
"bool",
"char",
"class",
"const",
"const_cast",
"double",
"dynamic_cast",
"enum",
"explicit",
"extern",
"float",
"friend",
"inline",
"int",
"long",
"mutable",
"namespace",
"private",
"protected",
"public",
"register",
"short",
"signed",
"sizeof",
"static",
"static_cast",
"struct",
"template",
"typedef",
"typename",
"union",
"unsigned",
"virtual",
"void",
"volatile"
};
// 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
// 'compare_keywords()' - Compare two keywords...
extern "C" {
static int compare_keywords(const void *a, const void *b) {
return strcmp(*((const char **)a), *((const char **)b));
}
}
// 'style_parse()' - Parse text and produce style data.
void CodeEditor::style_parse(const char *text, char *style, int length) {
char current;
int col;
int last;
char buf[255],
*bufptr;
const char *temp;
// Style letters:
//
// A - Plain
// B - Line comments
// C - Block comments
// D - Strings
// E - Directives
// F - Types
// G - Keywords
for (current = *style, col = 0, last = 0; length > 0; length --, text ++) {
if (current == 'B' || current == 'F' || current == 'G') current = 'A';
if (current == 'A') {
// Check for directives, comments, strings, and keywords...
if (col == 0 && *text == '#') {
// Set style to directive
current = 'E';
} else if (strncmp(text, "//", 2) == 0) {
current = 'B';
for (; length > 0 && *text != '\n'; length --, text ++) *style++ = 'B';
if (length == 0) break;
} else if (strncmp(text, "/*", 2) == 0) {
current = 'C';
} else if (strncmp(text, "\\\"", 2) == 0) {
// Quoted quote...
*style++ = current;
*style++ = current;
text ++;
length --;
col += 2;
continue;
} else if (*text == '\"') {
current = 'D';
} else if (!last && (islower(*text) || *text == '_')) {
// Might be a keyword...
for (temp = text, bufptr = buf;
(islower(*temp) || *temp == '_') && bufptr < (buf + sizeof(buf) - 1);
*bufptr++ = *temp++) {
// nothing
}
if (!islower(*temp) && *temp != '_') {
*bufptr = '\0';
bufptr = buf;
if (bsearch(&bufptr, code_types,
sizeof(code_types) / sizeof(code_types[0]),
sizeof(code_types[0]), compare_keywords)) {
while (text < temp) {
*style++ = 'F';
text ++;
length --;
col ++;
}
text --;
length ++;
last = 1;
continue;
} else if (bsearch(&bufptr, code_keywords,
sizeof(code_keywords) / sizeof(code_keywords[0]),
sizeof(code_keywords[0]), compare_keywords)) {
while (text < temp) {
*style++ = 'G';
text ++;
length --;
col ++;
}
text --;
length ++;
last = 1;
continue;
}
}
}
} else if (current == 'C' && strncmp(text, "*/", 2) == 0) {
// Close a C comment...
*style++ = current;
*style++ = current;
text ++;
length --;
current = 'A';
col += 2;
continue;
} else if (current == 'D') {
// Continuing in string...
if (strncmp(text, "\\\"", 2) == 0) {
// Quoted end quote...
*style++ = current;
*style++ = current;
text ++;
length --;
col += 2;
continue;
} else if (*text == '\"') {
// End quote...
*style++ = current;
col ++;
current = 'A';
continue;
}
}
// Copy style info...
if (current == 'A' && (*text == '{' || *text == '}')) *style++ = 'G';
else *style++ = current;
col ++;
last = isalnum(*text) || *text == '_' || *text == '.';
if (*text == '\n') {
// Reset column and possibly reset the style
col = 0;
if (current == 'B' || current == 'E') current = 'A';
}
}
}
// '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;
int start, // Start of text
end; // End of text
char last, // Last style on line
*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);
// Re-parse the changed region; we do this by parsing from the
// beginning of the line of the changed region to the end of
// the line of the changed region... Then we check the last
// style character and keep updating if we have a multi-line
// comment character...
start = editor->mBuffer->line_start(pos);
// the following code checks the style of the last character of the previous
// line. If it is a block comment, the previous line is interpreted as well.
int altStart = editor->mBuffer->prev_char(start);
if (altStart>0) {
altStart = editor->mBuffer->prev_char(altStart);
if (altStart>=0 && editor->mStyleBuffer->byte_at(start-2)=='C')
start = editor->mBuffer->line_start(altStart);
}
end = editor->mBuffer->line_end(pos + nInserted);
text = editor->mBuffer->text_range(start, end);
style = editor->mStyleBuffer->text_range(start, end);
if (start==end)
last = 0;
else
last = style[end - start - 1];
style_parse(text, style, end - start);
editor->mStyleBuffer->replace(start, end, style);
editor->redisplay_range(start, end);
if (start==end || last != style[end - start - 1]) {
// The last character on the line changed styles, so reparse the
// remainder of the buffer...
free(text);
free(style);
end = editor->mBuffer->length();
text = editor->mBuffer->text_range(start, end);
style = editor->mStyleBuffer->text_range(start, end);
style_parse(text, style, end - start);
editor->mStyleBuffer->replace(start, end, style);
editor->redisplay_range(start, end);
}
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());
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);
}
//
// End of "$Id$".
//
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