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359 lines (307 loc) · 10.9 KB
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/* -*- mode: java; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
CppInputHandler - C++-mode-specific handling of keys
Ported from processing.mode.java.JavaInputHandler to give CppMode's
editor full behavioral parity with the stock Java mode: identical
auto-indent on Enter (including brace-depth lookback), identical
auto-dedent when typing a closing brace, identical Tab/Shift+Tab
indent/outdent/expand handling, and identical Ctrl+Up/Ctrl+Down
jump-to-blank-line navigation.
On top of that parity baseline, this also keeps CppMode's own
Ctrl+/ comment-toggle binding.
*/
package processing.mode.cpp;
import java.awt.event.KeyEvent;
import java.util.Arrays;
import processing.app.Preferences;
import processing.app.Sketch;
import processing.app.syntax.JEditTextArea;
import processing.app.syntax.PdeInputHandler;
import processing.app.ui.Editor;
public class CppInputHandler extends PdeInputHandler {
public CppInputHandler(Editor editor) {
super(editor);
}
/**
* Intercepts key pressed events for JEditTextArea.
* <p/>
* Called by JEditTextArea inside processKeyEvent(). Note that this
* won't intercept actual characters, because those are fired on
* keyTyped().
* @return true if the event has been handled (to remove it from the queue)
*/
public boolean handlePressed(KeyEvent event) {
char c = event.getKeyChar();
int code = event.getKeyCode();
Sketch sketch = editor.getSketch();
JEditTextArea textarea = editor.getTextArea();
if (event.isMetaDown()) {
return false;
}
if ((code == KeyEvent.VK_BACK_SPACE) || (code == KeyEvent.VK_TAB) ||
(code == KeyEvent.VK_ENTER) || ((c >= 32) && (c < 128))) {
sketch.setModified(true);
}
// ── Ctrl+/ : toggle line comment (CppMode addition, kept from before) ──
if (event.isControlDown() && (code == KeyEvent.VK_SLASH)) {
if (editor instanceof CppEditor) {
((CppEditor) editor).toggleComment(textarea);
}
event.consume();
return true;
}
if ((code == KeyEvent.VK_UP) && event.isControlDown()) {
// back up to the last empty line
char[] contents = textarea.getText().toCharArray();
int caretIndex = textarea.getCaretPosition();
int index = calcLineStart(caretIndex - 1, contents);
index -= 2; // step over the newline
boolean onlySpaces = true;
while (index > 0) {
if (contents[index] == 10) {
if (onlySpaces) {
index++;
break;
} else {
onlySpaces = true; // reset
}
} else if (contents[index] != ' ') {
onlySpaces = false;
}
index--;
}
// if the first char, index will be -2
if (index < 0) index = 0;
if (event.isShiftDown()) {
textarea.setSelectionStart(caretIndex);
textarea.setSelectionEnd(index);
} else {
textarea.setCaretPosition(index);
}
event.consume();
} else if ((code == KeyEvent.VK_DOWN) && event.isControlDown()) {
char[] contents = textarea.getText().toCharArray();
int caretIndex = textarea.getCaretPosition();
int index = caretIndex;
int lineStart = 0;
boolean onlySpaces = false; // don't count this line
while (index < contents.length) {
if (contents[index] == 10) {
if (onlySpaces) {
index = lineStart; // this is it
break;
} else {
lineStart = index + 1;
onlySpaces = true; // reset
}
} else if (contents[index] != ' ') {
onlySpaces = false;
}
index++;
}
if (event.isShiftDown()) {
textarea.setSelectionStart(caretIndex);
textarea.setSelectionEnd(index);
} else {
textarea.setCaretPosition(index);
}
event.consume();
} else if (c == 9) { // Tab
if (event.isShiftDown()) {
// if shift is down, the user always expects an outdent
editor.handleOutdent();
} else if (textarea.isSelectionActive()) {
editor.handleIndent();
} else if (Preferences.getBoolean("editor.tabs.expand")) {
int tabSize = Preferences.getInteger("editor.tabs.size");
textarea.setSelectedText(spaces(tabSize));
event.consume();
} else { // !Preferences.getBoolean("editor.tabs.expand")
textarea.setSelectedText("\t");
event.consume();
}
} else if (code == 10 || code == 13) { // auto-indent on Enter
if (Preferences.getBoolean("editor.indent")) {
char[] contents = textarea.getText().toCharArray();
int tabSize = Preferences.getInteger("editor.tabs.size");
// this is the previous character (i.e. when you hit return,
// it'll be the last character just before where the newline
// will be inserted)
int origIndex = textarea.getCaretPosition() - 1;
// calculate the amount of indent on the previous line;
// this will be used *only if the prev line is not a brace*
int spaceCount = calcSpaceCount(origIndex, contents);
// If the last character was a left curly brace, indent one
// level deeper than that brace's own line, walking back past
// any intermediate lines.
int index2 = origIndex;
while ((index2 >= 0) && Character.isWhitespace(contents[index2])) {
index2--;
}
if (index2 != -1) {
if (contents[index2] == '{') {
spaceCount = calcSpaceCount(index2, contents);
spaceCount += tabSize;
}
}
// walk forward from the caret to count spaces already there
// so they aren't duplicated, and check for closing braces
// ahead on the line
int index = origIndex + 1;
int extraCount = 0;
while ((index < contents.length) && (contents[index] == ' ')) {
extraCount++;
index++;
}
int braceCount = 0;
while ((index < contents.length) && (contents[index] != '\n')) {
if (contents[index] == '}') {
braceCount++;
}
index++;
}
spaceCount -= extraCount;
if (spaceCount < 0) {
textarea.setSelectionEnd(textarea.getSelectionStop() - spaceCount);
textarea.setSelectedText("\n");
textarea.setCaretPosition(textarea.getCaretPosition() + extraCount + spaceCount);
} else {
String insertion = "\n" + spaces(spaceCount);
textarea.setSelectedText(insertion);
textarea.setCaretPosition(textarea.getCaretPosition() + extraCount);
}
// not gonna bother handling more than one brace
if (braceCount > 0) {
int sel = textarea.getSelectionStart();
if (sel - tabSize >= 0) {
textarea.select(sel - tabSize, sel);
String s = spaces(tabSize);
if (s.equals(textarea.getSelectedText())) {
textarea.setSelectedText("");
} else {
textarea.select(sel, sel);
}
}
}
} else {
// Enter/Return was being consumed somehow even if false was
// returned, so this is a band-aid to simply fire the event again.
textarea.setSelectedText(String.valueOf(c));
}
// mark this event as already handled (all but ignored)
event.consume();
} else if (c == '}') {
if (Preferences.getBoolean("editor.indent")) {
// first remove anything that was there (in case multiple
// characters are selected, so it's not in the way of the
// spaces for the auto-indent)
if (textarea.getSelectionStart() != textarea.getSelectionStop()) {
textarea.setSelectedText("");
}
// if this brace is the only thing on the line, outdent
char[] contents = textarea.getText().toCharArray();
int prevCharIndex = textarea.getCaretPosition() - 1;
// backup from the current caret position to the last newline,
// checking for anything besides whitespace along the way.
// if there's something besides whitespace, exit without
// messing any sort of indenting.
int index = prevCharIndex;
boolean finished = false;
while ((index != -1) && (!finished)) {
if (contents[index] == 10) {
finished = true;
index++;
} else if (contents[index] != ' ') {
// don't do anything, this line has other stuff on it
return false;
} else {
index--;
}
}
if (!finished) return false; // brace with no start
int lineStartIndex = index;
int pairedSpaceCount = calcBraceIndent(prevCharIndex, contents);
if (pairedSpaceCount == -1) return false;
textarea.setSelectionStart(lineStartIndex);
textarea.setSelectedText(spaces(pairedSpaceCount));
// mark this event as already handled
event.consume();
return true;
}
}
return false;
}
public boolean handleTyped(KeyEvent event) {
char c = event.getKeyChar();
if (event.isControlDown()) {
if (c == KeyEvent.VK_COMMA) {
event.consume();
return true;
}
if (c == KeyEvent.VK_SPACE) {
event.consume();
return true;
}
}
return false;
}
/**
* Return the index for the first character on this line.
*/
protected int calcLineStart(int index, char[] contents) {
boolean finished = false;
while ((index != -1) && (!finished)) {
if ((contents[index] == 10) || (contents[index] == 13)) {
finished = true;
} else {
index--;
}
}
// add one because index is either -1 (the start of the document)
// or it's the newline character for the previous line
return index + 1;
}
/**
* Calculate the number of spaces on this line.
*/
protected int calcSpaceCount(int index, char[] contents) {
index = calcLineStart(index, contents);
int spaceCount = 0;
while ((index < contents.length) && (index >= 0) &&
(contents[index++] == ' ')) {
spaceCount++;
}
return spaceCount;
}
/**
* Walk back from 'index' until the brace that seems to be
* the beginning of the current block, and return the number of
* spaces found on that line.
*/
protected int calcBraceIndent(int index, char[] contents) {
int braceDepth = 1;
boolean finished = false;
while ((index != -1) && (!finished)) {
if (contents[index] == '}') {
braceDepth++;
index--;
} else if (contents[index] == '{') {
braceDepth--;
if (braceDepth == 0) {
finished = true;
}
index--;
} else {
index--;
}
}
// never found a proper brace, be safe and don't do anything
if (!finished) return -1;
return calcSpaceCount(index, contents);
}
static private String spaces(int count) {
char[] c = new char[count];
Arrays.fill(c, ' ');
return new String(c);
}
}