processing/java/src/processing/mode/java/JavaInputHandler.java at master · qicny/processing · GitHub

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/* -*- mode: java; c-basic-offset: 2; indent-tabs-mode: nil -*- */

Part of the Processing project - http://processing.org

This program is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 2 of the License, or

(at your option) any later version.

This program is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

GNU General Public License for more details.

You should have received a copy of the GNU General Public License

along with this program; if not, write to the Free Software Foundation,

Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

package processing.mode.java;

import processing.app.Preferences;

import processing.app.Sketch;

import processing.app.syntax.*;

import processing.app.ui.Editor;

import java.awt.*;

import java.awt.event.*;

import java.util.Arrays;

/**

* Filters key events for tab expansion/indent/etc. This is very old code

* that we'd love to replace with a smarter parser/formatter, rather than

* continuing to hack this class.

public class JavaInputHandler extends PdeInputHandler {

private Editor editor;

/** ctrl-alt on windows and linux, cmd-alt on mac os x */

static final int CTRL_ALT = ActionEvent.ALT_MASK |

Toolkit.getDefaultToolkit().getMenuShortcutKeyMask();

public JavaInputHandler(Editor editor) {

this.editor = 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.getModifiers() & InputEvent.META_MASK) != 0) {

//event.consume(); // does nothing

return false;

}

if ((code == KeyEvent.VK_BACK_SPACE) || (code == KeyEvent.VK_TAB) ||

(code == KeyEvent.VK_ENTER) || ((c >= 32) && (c < 128))) {

sketch.setModified(true);

}

if ((code == KeyEvent.VK_UP) &&

((event.getModifiers() & InputEvent.CTRL_MASK) != 0)) {

// back up to the last empty line

char contents[] = textarea.getText().toCharArray();

//int origIndex = textarea.getCaretPosition() - 1;

int caretIndex = textarea.getCaretPosition();

int index = calcLineStart(caretIndex - 1, contents);

//System.out.println("line start " + (int) contents[index]);

index -= 2; // step over the newline

//System.out.println((int) contents[index]);

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.getModifiers() & InputEvent.SHIFT_MASK) != 0) {

textarea.setSelectionStart(caretIndex);

textarea.setSelectionEnd(index);

} else {

textarea.setCaretPosition(index);

}

event.consume();

// return true;

} else if ((code == KeyEvent.VK_DOWN) &&

((event.getModifiers() & InputEvent.CTRL_MASK) != 0)) {

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.getModifiers() & InputEvent.SHIFT_MASK) != 0) {

textarea.setSelectionStart(caretIndex);

textarea.setSelectionEnd(index);

} else {

textarea.setCaretPosition(index);

}

event.consume();

// return true;

} else if (c == 9) {

if ((event.getModifiers() & InputEvent.SHIFT_MASK) != 0) {

// if shift is down, the user always expects an outdent

// http://code.google.com/p/processing/issues/detail?id=458

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 if (!Preferences.getBoolean("editor.tabs.expand")) {

textarea.setSelectedText("\t");

event.consume();

}

} else if (c == 10 || c == 13) { // auto-indent

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;

// if the previous thing is a brace (whether prev line or

// up farther) then the correct indent is the number of spaces

// on that line + 'indent'.

// if the previous line is not a brace, then just use the

// identical indentation to the previous line

// calculate the amount of indent on the previous line

// this will be used *only if the prev line is not an indent*

int spaceCount = calcSpaceCount(origIndex, contents);

// If the last character was a left curly brace, then indent.

// For 0122, walk backwards a bit to make sure that the there isn't a

// curly brace several spaces (or lines) back. Also moved this before

// calculating extraCount, since it'll affect that as well.

int index2 = origIndex;

while ((index2 >= 0) &&

Character.isWhitespace(contents[index2])) {

index2--;

}

if (index2 != -1) {

// still won't catch a case where prev stuff is a comment

if (contents[index2] == '{') {

// intermediate lines be damned,

// use the indent for this line instead

spaceCount = calcSpaceCount(index2, contents);

spaceCount += tabSize;

}

// now before inserting this many spaces, walk forward from

// the caret position and count the number of spaces,

// so that the number of spaces aren't duplicated again

int index = origIndex + 1;

int extraCount = 0;

while ((index < contents.length) &&

(contents[index] == ' ')) {

//spaceCount--;

extraCount++;

index++;

}

int braceCount = 0;

while ((index < contents.length) && (contents[index] != '\n')) {

if (contents[index] == '}') {

braceCount++;

}

index++;

}

// Hitting return on a line with spaces *after* the caret

// can cause trouble. For 0099, was ignoring the case, but this is

// annoying, so in 0122 we're trying to fix that.

spaceCount -= extraCount;

if (spaceCount < 0) {

// for rev 0122, actually delete extra space

//textarea.setSelectionStart(origIndex + 1);

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();

// sel - tabSize will be -1 if start/end parens on the same line

// http://dev.processing.org/bugs/show_bug.cgi?id=484

if (sel - tabSize >= 0) {

textarea.select(sel - tabSize, sel);

String s = spaces(tabSize);

// if these are spaces that we can delete

if (textarea.getSelectedText().equals(s)) {

textarea.setSelectedText("");

} else {

textarea.select(sel, sel);

}

} else {

// Enter/Return was being consumed by somehow even if false

// was returned, so this is a band-aid to simply fire the event again.

// http://dev.processing.org/bugs/show_bug.cgi?id=1073

textarea.setSelectedText(String.valueOf(c));

}

// mark this event as already handled (all but ignored)

event.consume();

// return true;

} else if (c == '}') {

if (Preferences.getBoolean("editor.indent")) {

// first remove anything that was there (in case this multiple

// characters are selected, so that 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();

// index to the character to the left of the caret

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); //, 1);

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.getModifiers() & InputEvent.CTRL_MASK) != 0) {

// on linux, ctrl-comma (prefs) being passed through to the editor

if (c == KeyEvent.VK_COMMA) {

event.consume();

return true;

}

// https://github.com/processing/processing/issues/3847

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[]) {

// backup from the current caret position to the last newline,

// so that we can figure out how far this line was indented

/*int spaceCount = 0;*/

boolean finished = false;

while ((index != -1) && (!finished)) {

if ((contents[index] == 10) ||

(contents[index] == 13)) {

finished = true;

//index++; // maybe ?

} else {

index--; // new

}

// 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;

// now walk forward and figure out how many spaces there are

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) {

// now that we know things are ok to be indented, walk

// backwards to the last { to see how far its line is indented.

// this isn't perfect cuz it'll pick up commented areas,

// but that's not really a big deal and can be fixed when

// this is all given a more complete (proper) solution.

int braceDepth = 1;

boolean finished = false;

while ((index != -1) && (!finished)) {

if (contents[index] == '}') {

// aww crap, this means we're one deeper

// and will have to find one more extra {

braceDepth++;

//if (braceDepth == 0) {

//finished = true;

//}

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;

// check how many spaces on the line with the matching open brace

//int pairedSpaceCount = calcSpaceCount(index, contents);

return calcSpaceCount(index, contents);

}

static private String spaces(int count) {

char[] c = new char[count];

Arrays.fill(c, ' ');

return new String(c);

}

processing/java/src/processing/mode/java/JavaInputHandler.java at master · qicny/processing · GitHub

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