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[08 - AST] Add ASTParser, ASTParserTreeTest abstract and Parser abstract

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Humenius
2020-05-18 11:22:16 +02:00
parent bc72602f89
commit 8cf57691dc
7 changed files with 203 additions and 19 deletions
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18
ÜB-Praxis-Abstiegsparser für X-Leer/src/de/dhbw/compiler/xparser/ASTParser.java Normal file
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@@ -0,0 +1,18 @@
package de.dhbw.compiler.xparser;
import de.dhbw.compiler.xparser.api.Parser;
/**
* <h1>ASTParser</h1>
* <p>Parses programming language X into abstract syntax trees.</p>
*/
public class ASTParser extends Parser {
public ASTParser(TokenReader in) {
super(in);
}
@Override
public Tree parseProgram() {
return null;
}
}

21
ÜB-Praxis-Abstiegsparser für X-Leer/src/de/dhbw/compiler/xparser/XParser.java
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@@ -11,13 +11,14 @@
package de.dhbw.compiler.xparser;
public class XParser {
private final TokenReader in;
import de.dhbw.compiler.xparser.api.Parser;
public class XParser extends Parser {
public XParser(TokenReader in) {
this.in = in;
super(in);
}
@Override
public Tree parseProgram() {
int oldPosition = in.getPosition();
Tree program, id, semicolon, block, dot, eof;
@@ -277,18 +278,4 @@ public class XParser {
in.setPosition(oldPosition);
return null;
}
private Tree parseToken(int tokenType) {
int oldPosition = in.getPosition();
Token nextToken = in.nextToken();
System.out.println("parseToken> " + nextToken + " = " + Token.getTypeName(tokenType));
if (nextToken.getType() == tokenType) {
return new Tree(nextToken);
} else {
// Reset to last position as it needs to be re-read again
in.setPosition(oldPosition);
return null;
}
}
}

28
ÜB-Praxis-Abstiegsparser für X-Leer/src/de/dhbw/compiler/xparser/api/Parser.java Normal file
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@@ -0,0 +1,28 @@
package de.dhbw.compiler.xparser.api;
import de.dhbw.compiler.xparser.Token;
import de.dhbw.compiler.xparser.TokenReader;
import de.dhbw.compiler.xparser.Tree;
public abstract class Parser {
protected final TokenReader in;
protected Parser(TokenReader in) {
this.in = in;
}
public abstract Tree parseProgram();
protected Tree parseToken(int tokenType) {
int oldPosition = in.getPosition();
Token nextToken = in.nextToken();
System.out.println("parseToken> " + nextToken + " = " + Token.getTypeName(tokenType));
if (nextToken.getType() == tokenType) {
return new Tree(nextToken);
} else {
// Reset to last position as it needs to be re-read again
in.setPosition(oldPosition);
return null;
}
}
}

27
ÜB-Praxis-Abstiegsparser für X-Leer/src/de/dhbw/compiler/xparser/test/ASTParseTreeTest.java Normal file
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@@ -0,0 +1,27 @@
package de.dhbw.compiler.xparser.test;
import static org.junit.Assert.assertEquals;
import java.io.StringReader;
import de.dhbw.compiler.xparser.ASTParser;
import de.dhbw.compiler.xparser.JFlexXScanner;
import de.dhbw.compiler.xparser.TokenReader;
import de.dhbw.compiler.xparser.Tree;
public abstract class ASTParseTreeTest extends ParseTreeTest {
@Override
protected void testParseTree(String in, String expected) throws Exception {
JFlexXScanner scanner = new JFlexXScanner(new StringReader(in));
TokenReader reader = new TokenReader(scanner);
ASTParser parser = new ASTParser(reader);
Tree out = parser.parseProgram();
if (out==null) {
assertEquals(expected, out);
} else {
assertEquals(expected, out.toString());
}
}
}

2
ÜB-Praxis-Abstiegsparser für X-Leer/src/de/dhbw/compiler/xparser/test/TestXASTParser1.java
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@@ -16,7 +16,7 @@ import org.junit.Test;
import org.junit.runners.MethodSorters;
@FixMethodOrder(MethodSorters.NAME_ASCENDING)
public class TestXASTParser1 extends ParseTreeTest {
public class TestXASTParser1 extends ASTParseTreeTest {
@Test
public void program00BeginEnd() throws Exception {

2
ÜB-Praxis-Abstiegsparser für X-Leer/src/de/dhbw/compiler/xparser/test/TestXASTParser2.java
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@@ -16,7 +16,7 @@ import org.junit.Test;
import org.junit.runners.MethodSorters;
@FixMethodOrder(MethodSorters.NAME_ASCENDING)
public class TestXASTParser2 extends ParseTreeTest {
public class TestXASTParser2 extends ASTParseTreeTest {
@Test
public void program30Decl() throws Exception {