64 lines
1.5 KiB
Java
64 lines
1.5 KiB
Java
package terminal;
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import static java.lang.Character.isDigit;
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import static terminal.ControlSequenceLookup.lookupControlSequence;
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import static util.Characters.*;
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import terminal.SafeStream.SafeInputStream;
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class ControlSequenceHandler {
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private static final char ESCAPE = '\u001B';
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public static final boolean isEscape(char c) {
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return c == ESCAPE;
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}
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private SafeInputStream input;
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private String code;
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private int currentCharacter;
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public ControlSequenceHandler() {
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this.input = null;
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this.code = "";
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this.currentCharacter = 0;
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}
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public ControlSequence parse(SafeInputStream inputStream) {
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input = inputStream;
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code = "";
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readCharacter();
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if (isExpectedFirstCharacter())
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readCode();
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return lookupControlSequence((char) currentCharacter, code);
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}
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private void readCharacter() {
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currentCharacter = input.read();
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}
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private boolean isExpectedFirstCharacter() {
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return isCharacter() && isLeftBracket();
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}
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private boolean isCharacter() {
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return currentCharacter != EOF;
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}
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private boolean isLeftBracket() {
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return (char) currentCharacter == LEFT_SQUARE_BRACKET;
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}
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private void readCode() {
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for (readCharacter(); isPartOfCode(); readCharacter())
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code += (char) currentCharacter;
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}
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private boolean isPartOfCode() {
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return isCharacter() && isDigit((char) currentCharacter);
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}
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}
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