X-Git-Url: http://git.nikiroo.be/?a=blobdiff_plain;f=src%2Fjexer%2Fteditor%2FLine.java;h=7cd5febabee8462f6c51bc66e886903795aff698;hb=12b90437b5f22c2ae6e9b9b14c3b62b60f6143e5;hp=b89d8277ed30b1ac6b1a500f9056839b9b87069c;hpb=12b55d76e3473407bf37fca3667860240cb8f3be;p=nikiroo-utils.git diff --git a/src/jexer/teditor/Line.java b/src/jexer/teditor/Line.java index b89d827..7cd5feb 100644 --- a/src/jexer/teditor/Line.java +++ b/src/jexer/teditor/Line.java @@ -3,7 +3,7 @@ * * The MIT License (MIT) * - * Copyright (C) 2017 Kevin Lamonte + * Copyright (C) 2019 Kevin Lamonte * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), @@ -31,132 +31,335 @@ package jexer.teditor; import java.util.ArrayList; import java.util.List; +import jexer.bits.CellAttributes; +import jexer.bits.StringUtils; + /** * A Line represents a single line of text on the screen, as a collection of * words. */ public class Line { + // ------------------------------------------------------------------------ + // Variables -------------------------------------------------------------- + // ------------------------------------------------------------------------ + /** * The list of words. */ private ArrayList words = new ArrayList(); /** - * The current cursor position on this line. + * The default color for the TEditor class. + */ + private CellAttributes defaultColor = null; + + /** + * The text highlighter to use. + */ + private Highlighter highlighter = null; + + /** + * The current edition position on this line. + */ + private int position = 0; + + /** + * The current editing position screen column number. */ - private int cursorX; + private int screenPosition = 0; /** - * The current word that the cursor position is in. + * The raw text of this line, what is passed to Word to determine + * highlighting behavior. */ - private Word currentWord; + private StringBuilder rawText; + + // ------------------------------------------------------------------------ + // Constructors ----------------------------------------------------------- + // ------------------------------------------------------------------------ /** - * We use getDisplayLength() a lot, so cache the value. + * Construct a new Line from an existing text string, and highlight + * certain strings. + * + * @param str the text string + * @param defaultColor the color for unhighlighted text + * @param highlighter the highlighter to use + */ + public Line(final String str, final CellAttributes defaultColor, + final Highlighter highlighter) { + + this.defaultColor = defaultColor; + this.highlighter = highlighter; + this.rawText = new StringBuilder(str); + + scanLine(); + } + + /** + * Construct a new Line from an existing text string. + * + * @param str the text string + * @param defaultColor the color for unhighlighted text */ - private int displayLength = -1; + public Line(final String str, final CellAttributes defaultColor) { + this(str, defaultColor, null); + } + + // ------------------------------------------------------------------------ + // Line ------------------------------------------------------------------- + // ------------------------------------------------------------------------ /** - * Get a (shallow) copy of the list of words. + * Get a (shallow) copy of the words in this line. * - * @return the list of words + * @return a copy of the word list */ public List getWords() { return new ArrayList(words); } + /** + * Get the current cursor position in the text. + * + * @return the cursor position + */ + public int getRawCursor() { + return position; + } + + /** + * Get the current cursor position on screen. + * + * @return the cursor position + */ + public int getCursor() { + return screenPosition; + } + + /** + * Set the current cursor position. + * + * @param cursor the new cursor position + */ + public void setCursor(final int cursor) { + if ((cursor < 0) + || ((cursor >= getDisplayLength()) + && (getDisplayLength() > 0)) + ) { + throw new IndexOutOfBoundsException("Max length is " + + getDisplayLength() + ", requested position " + cursor); + } + screenPosition = cursor; + position = screenToTextPosition(screenPosition); + } + + /** + * Get the character at the current cursor position in the text. + * + * @return the character, or -1 if the cursor is at the end of the line + */ + public int getChar() { + if (position == rawText.length()) { + return -1; + } + return rawText.codePointAt(position); + } + /** * Get the on-screen display length. * * @return the number of cells needed to display this line */ public int getDisplayLength() { - if (displayLength != -1) { - return displayLength; - } - int n = 0; - for (Word word: words) { - n += word.getDisplayLength(); + int n = StringUtils.width(rawText.toString()); + + if (n > 0) { + // If we have any visible characters, add one to the display so + // that the position is immediately after the data. + return n + 1; } - displayLength = n; - return displayLength; + return n; } /** - * Construct a new Line from an existing text string. + * Get the raw string that matches this line. * - * @param str the text string + * @return the string + */ + public String getRawString() { + return rawText.toString(); + } + + /** + * Scan rawText and make words out of it. */ - public Line(final String str) { - currentWord = new Word(); - words.add(currentWord); - for (int i = 0; i < str.length(); i++) { - char ch = str.charAt(i); - Word newWord = currentWord.addChar(ch); - if (newWord != currentWord) { + private void scanLine() { + words.clear(); + Word word = new Word(this.defaultColor, this.highlighter); + words.add(word); + for (int i = 0; i < rawText.length();) { + int ch = rawText.codePointAt(i); + i += Character.charCount(ch); + Word newWord = word.addChar(ch); + if (newWord != word) { words.add(newWord); - currentWord = newWord; + word = newWord; } } + for (Word w: words) { + w.applyHighlight(); + } } /** * Decrement the cursor by one. If at the first column, do nothing. + * + * @return true if the cursor position changed */ - public void left() { - if (cursorX == 0) { - return; + public boolean left() { + if (position == 0) { + return false; } - // TODO + screenPosition -= StringUtils.width(rawText.codePointBefore(position)); + position -= Character.charCount(rawText.codePointBefore(position)); + return true; } /** * Increment the cursor by one. If at the last column, do nothing. + * + * @return true if the cursor position changed */ - public void right() { - if (cursorX == getDisplayLength() - 1) { - return; + public boolean right() { + if (getDisplayLength() == 0) { + return false; + } + if (position == getDisplayLength() - 1) { + return false; + } + if (position < rawText.length()) { + screenPosition += StringUtils.width(rawText.codePointAt(position)); + position += Character.charCount(rawText.codePointAt(position)); } - // TODO + assert (position <= rawText.length()); + return true; } /** * Go to the first column of this line. + * + * @return true if the cursor position changed */ - public void home() { - // TODO + public boolean home() { + if (position > 0) { + position = 0; + screenPosition = 0; + return true; + } + return false; } /** * Go to the last column of this line. + * + * @return true if the cursor position changed */ - public void end() { - // TODO + public boolean end() { + if (position != getDisplayLength() - 1) { + position = rawText.length(); + screenPosition = StringUtils.width(rawText.toString()); + return true; + } + return false; } /** * Delete the character under the cursor. */ public void del() { - // TODO + assert (words.size() > 0); + + if (position < getDisplayLength()) { + int n = Character.charCount(rawText.codePointAt(position)); + for (int i = 0; i < n; i++) { + rawText.deleteCharAt(position); + } + } + + // Re-scan the line to determine the new word boundaries. + scanLine(); } /** * Delete the character immediately preceeding the cursor. */ public void backspace() { - // TODO + if (left()) { + del(); + } } /** - * Replace or insert a character at the cursor, depending on overwrite - * flag. + * Insert a character at the cursor. * - * @param ch the character to replace or insert + * @param ch the character to insert */ - public void addChar(final char ch) { - // TODO + public void addChar(final int ch) { + if (position < getDisplayLength() - 1) { + rawText.insert(position, Character.toChars(ch)); + } else { + rawText.append(Character.toChars(ch)); + } + position += Character.charCount(ch); + screenPosition += StringUtils.width(ch); + scanLine(); + } + + /** + * Replace a character at the cursor. + * + * @param ch the character to replace + */ + public void replaceChar(final int ch) { + if (position < getDisplayLength() - 1) { + // Replace character + String oldText = rawText.toString(); + rawText = new StringBuilder(oldText.substring(0, position)); + rawText.append(Character.toChars(ch)); + rawText.append(oldText.substring(position + 1)); + screenPosition += StringUtils.width(rawText.codePointAt(position)); + position += Character.charCount(ch); + } else { + rawText.append(Character.toChars(ch)); + position += Character.charCount(ch); + screenPosition += StringUtils.width(ch); + } + scanLine(); + } + + /** + * Determine string position from screen position. + * + * @param screenPosition the position on screen + * @return the equivalent position in text + */ + protected int screenToTextPosition(final int screenPosition) { + if (screenPosition == 0) { + return 0; + } + + int n = 0; + for (int i = 0; i < rawText.length(); i++) { + n += StringUtils.width(rawText.codePointAt(i)); + if (n >= screenPosition) { + return i + 1; + } + } + // screenPosition exceeds the available text length. + throw new IndexOutOfBoundsException("screenPosition " + screenPosition + + " exceeds available text length " + rawText.length()); } }