SysY.g4文件修改（变量命名修改，注释改为中文）

src/antlr4/.antlr/SysYLexer.java

@@ -19,8 +19,8 @@ public class SysYLexer extends Lexer {
 		CONST=1, INT=2, FLOAT=3, VOID=4, IF=5, ELSE=6, WHILE=7, BREAK=8, CONTINUE=9, 
 		RETURN=10, ADD=11, SUB=12, MUL=13, DIV=14, MOD=15, ASSIGN=16, EQ=17, NE=18, 
 		LT=19, LE=20, GT=21, GE=22, NOT=23, AND=24, OR=25, LPAREN=26, RPAREN=27, 
-		LBRACK=28, RBRACK=29, LBRACE=30, RBRACE=31, COMMA=32, SEMI=33, IDENT=34, 
-		ILITERAL=35, FLITERAL=36, WS=37, LINE_COMMENT=38, BLOCK_COMMENT=39;
+		LBRACK=28, RBRACK=29, LBRACE=30, RBRACE=31, COMMA=32, SEMI=33, Ident=34, 
+		IntConst=35, FloatConst=36, WS=37, LINE_COMMENT=38, BLOCK_COMMENT=39;
 	public static String[] channelNames = {
 		"DEFAULT_TOKEN_CHANNEL", "HIDDEN"
 	};
@@ -34,10 +34,10 @@ public class SysYLexer extends Lexer {
 			"CONST", "INT", "FLOAT", "VOID", "IF", "ELSE", "WHILE", "BREAK", "CONTINUE", 
 			"RETURN", "ADD", "SUB", "MUL", "DIV", "MOD", "ASSIGN", "EQ", "NE", "LT", 
 			"LE", "GT", "GE", "NOT", "AND", "OR", "LPAREN", "RPAREN", "LBRACK", "RBRACK", 
-			"LBRACE", "RBRACE", "COMMA", "SEMI", "IDENT", "DIGIT", "NON_ZERO_DIGIT", 
-			"OCT_DIGIT", "HEX_DIGIT", "DEC_INTEGER", "OCT_INTEGER", "HEX_INTEGER", 
-			"DEC_FRACTION", "DEC_EXPONENT", "DEC_FLOAT", "HEX_FRACTION", "BIN_EXPONENT", 
-			"HEX_FLOAT", "ILITERAL", "FLITERAL", "WS", "LINE_COMMENT", "BLOCK_COMMENT"
+			"LBRACE", "RBRACE", "COMMA", "SEMI", "Ident", "Digit", "NonzeroDigit", 
+			"OctDigit", "HexDigit", "DecInteger", "OctInteger", "HexInteger", "DecFraction", 
+			"DecExponent", "DecFloat", "HexFraction", "BinExponent", "HexFloat", 
+			"IntConst", "FloatConst", "WS", "LINE_COMMENT", "BLOCK_COMMENT"
 		};
 	}
 	public static final String[] ruleNames = makeRuleNames();
@@ -56,8 +56,8 @@ public class SysYLexer extends Lexer {
 			null, "CONST", "INT", "FLOAT", "VOID", "IF", "ELSE", "WHILE", "BREAK", 
 			"CONTINUE", "RETURN", "ADD", "SUB", "MUL", "DIV", "MOD", "ASSIGN", "EQ", 
 			"NE", "LT", "LE", "GT", "GE", "NOT", "AND", "OR", "LPAREN", "RPAREN", 
-			"LBRACK", "RBRACK", "LBRACE", "RBRACE", "COMMA", "SEMI", "IDENT", "ILITERAL", 
-			"FLITERAL", "WS", "LINE_COMMENT", "BLOCK_COMMENT"
+			"LBRACK", "RBRACK", "LBRACE", "RBRACE", "COMMA", "SEMI", "Ident", "IntConst", 
+			"FloatConst", "WS", "LINE_COMMENT", "BLOCK_COMMENT"
 		};
 	}
 	private static final String[] _SYMBOLIC_NAMES = makeSymbolicNames();

src/antlr4/SysY.g4

@@ -1,6 +1,6 @@
 grammar SysY;
 
-// ========================= Parser Rules =========================
+// ===================================== 语法规则（Parser Rules） =====================================
 
 compUnit: (decl | funcDef)+ EOF;
 
@@ -10,7 +10,7 @@ constDecl: CONST bType constDef (COMMA constDef)* SEMI;
 
 bType: INT | FLOAT;
 
-constDef: IDENT (LBRACK constExp RBRACK)* ASSIGN constInitVal;
+constDef: Ident (LBRACK constExp RBRACK)* ASSIGN constInitVal;
 
 constInitVal:
 	constExp
@@ -18,19 +18,21 @@ constInitVal:
 
 varDecl: bType varDef (COMMA varDef)* SEMI;
 
-varDef: IDENT (LBRACK constExp RBRACK)* (ASSIGN initVal)?;
+varDef:
+	Ident (LBRACK constExp RBRACK)*
+	| Ident (LBRACK constExp RBRACK)* ASSIGN initVal;
 
 initVal: exp | LBRACE (initVal (COMMA initVal)*)? RBRACE;
 
-funcDef: funcType IDENT LPAREN funcFParams? RPAREN block;
+funcDef: funcType Ident LPAREN funcFParams? RPAREN block;
 
 funcType: VOID | INT | FLOAT;
 
 funcFParams: funcFParam (COMMA funcFParam)*;
 
 funcFParam:
-	bType IDENT
-	| bType IDENT LBRACK RBRACK (LBRACK exp RBRACK)*;
+	bType Ident
+	| bType Ident LBRACK RBRACK (LBRACK exp RBRACK)*;
 
 block: LBRACE blockItem* RBRACE;
 
@@ -50,15 +52,15 @@ exp: addExp;
 
 cond: lOrExp;
 
-lVal: IDENT (LBRACK exp RBRACK)*;
+lVal: Ident (LBRACK exp RBRACK)*;
 
 primaryExp: LPAREN exp RPAREN | lVal | number;
 
-number: ILITERAL | FLITERAL;
+number: IntConst | FloatConst;
 
 unaryExp:
 	primaryExp							# primaryUnaryExp
-	| IDENT LPAREN funcRParams? RPAREN	# callUnaryExp
+	| Ident LPAREN funcRParams? RPAREN	# callUnaryExp
 	| unaryOp unaryExp					# opUnaryExp;
 
 unaryOp: ADD | SUB | NOT;
@@ -87,9 +89,9 @@ lOrExp: lAndExp # andLOrExp | lOrExp OR lAndExp # binaryLOrExp;
 
 constExp: addExp;
 
-// ========================= Lexer Rules =========================
+// ===================================== 词法规则（Lexer Rules） =====================================
 
-// keywords
+// ---------- 关键字 ----------
 CONST: 'const';
 INT: 'int';
 FLOAT: 'float';
@@ -101,7 +103,7 @@ BREAK: 'break';
 CONTINUE: 'continue';
 RETURN: 'return';
 
-// operators
+// ---------- 运算符 ----------
 ADD: '+';
 SUB: '-';
 MUL: '*';
@@ -121,7 +123,7 @@ NOT: '!';
 AND: '&&';
 OR: '||';
 
-// punctuations
+// ---------- 界符 ----------
 LPAREN: '(';
 RPAREN: ')';
 LBRACK: '[';
@@ -131,50 +133,67 @@ RBRACE: '}';
 COMMA: ',';
 SEMI: ';';
 
-// identifiers
-IDENT: [a-zA-Z_] [a-zA-Z_0-9]*;
+// ---------- 标识符 ---------- 与文档中的 Ident 对应
+Ident: [a-zA-Z_] [a-zA-Z_0-9]*;
 
-// integer literals
-fragment DIGIT: [0-9];
+// ===================================== 数值常量相关片段规则 =====================================
 
-fragment NON_ZERO_DIGIT: [1-9];
+// 十进制数字
+fragment Digit: [0-9];
 
-fragment OCT_DIGIT: [0-7];
+// 非零十进制数字
+fragment NonzeroDigit: [1-9];
 
-fragment HEX_DIGIT: [0-9a-fA-F];
+// 八进制数字
+fragment OctDigit: [0-7];
 
-fragment DEC_INTEGER: NON_ZERO_DIGIT DIGIT*;
+// 十六进制数字
+fragment HexDigit: [0-9a-fA-F];
 
-fragment OCT_INTEGER: '0' OCT_DIGIT*;
+// 十进制整数：非零开头，后接若干十进制数字
+fragment DecInteger: NonzeroDigit Digit*;
 
-fragment HEX_INTEGER: '0' [xX] HEX_DIGIT+;
+// 八进制整数：以 0 开头
+fragment OctInteger: '0' OctDigit*;
 
-// float literals
-fragment DEC_FRACTION: DIGIT+ '.' DIGIT* | '.' DIGIT+;
+// 十六进制整数：以 0x 或 0X 开头
+fragment HexInteger: '0' [xX] HexDigit+;
 
-fragment DEC_EXPONENT: [eE] [+\-]? DIGIT+;
+// 十进制小数部分
+fragment DecFraction: Digit+ '.' Digit* | '.' Digit+;
 
-fragment DEC_FLOAT:
-	DEC_FRACTION DEC_EXPONENT?
-	| DEC_INTEGER DEC_EXPONENT;
+// 十进制指数部分
+fragment DecExponent: [eE] [+\-]? Digit+;
 
-fragment HEX_FRACTION:
-	HEX_DIGIT* '.' HEX_DIGIT+
-	| HEX_DIGIT+ '.';
+// 十进制浮点数
+fragment DecFloat:
+	DecFraction DecExponent?
+	| DecInteger DecExponent;
 
-fragment BIN_EXPONENT: [pP] [+\-]? DIGIT+;
+// 十六进制小数部分
+fragment HexFraction: HexDigit* '.' HexDigit+ | HexDigit+ '.';
 
-fragment HEX_FLOAT:
-	'0' [xX] HEX_FRACTION BIN_EXPONENT
-	| HEX_INTEGER BIN_EXPONENT;
+// 十六进制浮点数的二进制指数部分
+fragment BinExponent: [pP] [+\-]? Digit+;
 
-ILITERAL: DEC_INTEGER | OCT_INTEGER | HEX_INTEGER;
+// 十六进制浮点数
+fragment HexFloat:
+	'0' [xX] HexFraction BinExponent
+	| HexInteger BinExponent;
 
-FLITERAL: DEC_FLOAT | HEX_FLOAT;
+// ---------- 整数字面量 ---------- 与文档中的 IntConst 对应
+IntConst: DecInteger | OctInteger | HexInteger;
 
-// comments and whitespace
+// ---------- 浮点数字面量 ---------- 与文档中的 FloatConst 对应
+FloatConst: DecFloat | HexFloat;
+
+// ===================================== 空白符与注释 =====================================
+
+// 空白字符直接跳过
 WS: [ \t\r\n]+ -> skip;
 
+// 单行注释：从 // 到行末
 LINE_COMMENT: '//' ~[\r\n]* -> skip;
 
+// 多行注释：从 /* 到 */
 BLOCK_COMMENT: '/*' .*? '*/' -> skip;