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LoopStatementParser使用抽象方法

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This commit is contained in:
Luke 2025-04-25 16:43:00 +08:00
parent 28d5459b4c
commit ba6c036122
2 changed files with 62 additions and 22 deletions
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38
src/main/java/org/jcnc/snow/compiler/parser/statement/LoopStatementParser.java
View File

@ -11,6 +11,7 @@ import org.jcnc.snow.compiler.parser.context.TokenStream;
import org.jcnc.snow.compiler.parser.expression.PrattExpressionParser;
import org.jcnc.snow.compiler.parser.factory.StatementParserFactory;
import org.jcnc.snow.compiler.parser.util.FlexibleSectionParser;
import org.jcnc.snow.compiler.parser.util.ParserUtils;
import java.util.ArrayList;
import java.util.HashMap;
@ -40,10 +41,9 @@ public class LoopStatementParser implements StatementParser {
TokenStream ts = ctx.getTokens();
// 匹配 loop:
ts.expect("loop");
ts.expect(":");
ts.expectType(TokenType.NEWLINE);
skipNewlines(ts);
ParserUtils.matchHeader(ts, "loop");
ParserUtils.skipNewlines(ts);
// 用于保存各区块内容
final StatementNode[] initializer = new StatementNode[1];
@ -61,9 +61,9 @@ public class LoopStatementParser implements StatementParser {
ts1.expect("initializer");
ts1.expect(":");
ts1.expectType(TokenType.NEWLINE);
skipNewlines(ts1);
ParserUtils.skipNewlines(ts);
initializer[0] = StatementParserFactory.get(ts1.peek().getLexeme()).parse(ctx1);
skipNewlines(ts1);
ParserUtils.skipNewlines(ts);
}
));
@ -74,10 +74,10 @@ public class LoopStatementParser implements StatementParser {
ts1.expect("condition");
ts1.expect(":");
ts1.expectType(TokenType.NEWLINE);
skipNewlines(ts1);
ParserUtils.skipNewlines(ts);
condition[0] = new PrattExpressionParser().parse(ctx1);
ts1.expectType(TokenType.NEWLINE);
skipNewlines(ts1);
ParserUtils.skipNewlines(ts);
}
));
@ -88,14 +88,14 @@ public class LoopStatementParser implements StatementParser {
ts1.expect("update");
ts1.expect(":");
ts1.expectType(TokenType.NEWLINE);
skipNewlines(ts1);
ParserUtils.skipNewlines(ts);
String varName = ts1.expectType(TokenType.IDENTIFIER).getLexeme();
ts1.expect("=");
ExpressionNode updateExpr = new PrattExpressionParser().parse(ctx1);
ts1.expectType(TokenType.NEWLINE);
update[0] = new AssignmentNode(varName, updateExpr);
skipNewlines(ts1);
ParserUtils.skipNewlines(ts);
}
));
@ -106,7 +106,7 @@ public class LoopStatementParser implements StatementParser {
ts1.expect("body");
ts1.expect(":");
ts1.expectType(TokenType.NEWLINE);
skipNewlines(ts1);
ParserUtils.skipNewlines(ts);
while (!(ts1.peek().getLexeme().equals("end") &&
ts1.peek(1).getLexeme().equals("body"))) {
@ -114,13 +114,13 @@ public class LoopStatementParser implements StatementParser {
? ts1.peek().getLexeme()
: "";
body.add(StatementParserFactory.get(keyword).parse(ctx1));
skipNewlines(ts1);
ParserUtils.skipNewlines(ts);
}
ts1.expect("end");
ts1.expect("body");
ts1.expectType(TokenType.NEWLINE);
skipNewlines(ts1);
ParserUtils.skipNewlines(ts);
}
));
@ -128,16 +128,10 @@ public class LoopStatementParser implements StatementParser {
FlexibleSectionParser.parse(ctx, ts, sections);
// 匹配 loop 结束
ts.expect("end");
ts.expect("loop");
ts.expectType(TokenType.NEWLINE);
ParserUtils.matchFooter(ts, "loop");
return new LoopNode(initializer[0], condition[0], update[0], body);
}
private void skipNewlines(TokenStream ts) {
while (ts.peek().getType() == TokenType.NEWLINE) {
ts.next();
}
}
}

46
src/main/java/org/jcnc/snow/compiler/parser/util/ParserUtils.java Normal file
View File

@ -0,0 +1,46 @@
package org.jcnc.snow.compiler.parser.util;
import org.jcnc.snow.compiler.lexer.token.TokenType;
import org.jcnc.snow.compiler.parser.context.TokenStream;
/**
* 常用的语法解析工具类。
*/
public class ParserUtils {
/**
* 匹配开头部分，如 `loop:`、`function:`
*
* @param ts Token 流
* @param keyword 关键词
*/
public static void matchHeader(TokenStream ts, String keyword) {
ts.expect(keyword);
ts.expect(":");
ts.expectType(TokenType.NEWLINE);
skipNewlines(ts);
}
/**
* 匹配结尾部分，如 `end loop`、`end function`
*
* @param ts Token 流
* @param keyword 关键词
*/
public static void matchFooter(TokenStream ts, String keyword) {
ts.expect("end");
ts.expect(keyword);
ts.expectType(TokenType.NEWLINE);
}
/**
* 跳过多余换行
*
* @param ts Token 流
*/
public static void skipNewlines(TokenStream ts) {
while (ts.peek().getType() == TokenType.NEWLINE) {
ts.next();
}
}
}