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Update Lexer.java

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nora 2021-05-28 15:33:51 +02:00 • committed by GitHub
parent 1e0c9c84c9
commit 9b51ff42a5
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1 changed files with 31 additions and 11 deletions
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42
src/main/java/com/github/nilstrieb/grsbpl/language/Lexer.java
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@ -71,6 +71,7 @@ public class Lexer {
case '&' -> add(AMPERSAND);
case '@' -> add(AT);
case ':' -> add(COLUMN);
case '"' -> string();
case '\'' -> character();
case ' ', '\t', '\r', '\n' -> {
}
@ -88,22 +89,41 @@ public class Lexer {
private void character() {
char value = advance();
if (value == '\\') {
char escaped = advance();
value = switch (escaped) {
case 'n' -> '\n';
case 'r' -> '\r';
case '\\' -> '\\';
case '0' -> '\0';
case '\'' -> '\'';
case 'b' -> '\b';
case 'f' -> '\f';
default -> throw new LexException("Invalid escape sequence: \\" + escaped, lineNumber, offsetLock, lineOffset - offsetLock);
};
value = escape();
}
add(CHAR, value);
consume();
}
private void string() {
StringBuilder stringBuilder = new StringBuilder();
while (true) {
char next = advance();
if (next == '\\') {
next = escape();
} else if (next == '"') {
break;
}
stringBuilder.append(next);
}
add(STRING, stringBuilder.toString());
}
private char escape() {
char escaped = advance();
return switch (escaped) {
case 'n' -> '\n';
case 'r' -> '\r';
case '\\' -> '\\';
case '0' -> '\0';
case '\'' -> '\'';
case 'b' -> '\b';
case 'f' -> '\f';
case '"' -> '"';
default -> throw new LexException("Invalid escape sequence: \\" + escaped, lineNumber, offsetLock, lineOffset - offsetLock);
};
}
private void comment() {
while (true) {
char next = advance();