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rdcheck.java
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rdcheck.java
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import java.io.*;
import java.util.ArrayList;
import java.util.Stack;
public class rdcheck {
public static final String ID = "Ident";
public static final String CONST = "const";
public static final String INT = "int";
public static final String INT_CONST = "IntConst";
public static final String VOID = "void";
public static final String IF = "if";
public static final String IF_BODY = "if_body";
public static final String ELSE = "else";
public static final String ELSE_BODY = "else_body";
public static final String WHILE = "while";
public static final String WHILE_BODY = "while_body";
public static final String BREAK = "break";
public static final String CONTINUE = "continue";
public static final String RETURN = "return";
public static final String MAIN = "main";
public static class Bean {
public String type;
public String value;
public ArrayList<Bean> beans;
public Bean() {
beans = new ArrayList<>();
}
public Bean(String type) {
this();
this.type = type;
}
public Bean(String type, String value) {
this();
this.type = type;
this.value = value;
}
public void add(Bean bean) {
if (bean != null)
beans.add(bean);
}
@Override
public String toString() {
if (value == null || value.trim().length() == 0)
return type;
return type + "(" + value + ")";
}
}
public static BufferedReader reader;
public static int index = 0;
public static int length = 0;
public static int max_sign = 0;
public static ArrayList<String> type;
public static ArrayList<String> value;
public static Stack<Integer> sign;
public static ArrayList<StackTraceElement> elements = new ArrayList<>();
public static void mark() {
sign.push(index);
}
public static Bean back() {
index = sign.pop();
//跟踪识别最后位置
if (index > max_sign) {
max_sign = index;
elements = new ArrayList<>();
}
if (index >= max_sign) {
elements.add(Thread.currentThread().getStackTrace()[2]);
}
// max_sign = Math.max(index, max_sign);
return null;
}
public static void reset() {
index = sign.peek();
}
public static boolean matchType(String type) {
boolean match = index < rdcheck.type.size() && rdcheck.type.get(index).equals(type);
//仅在匹配时增加(避免内部错失)
//消费后才下一个
if (match) index++;
return match;
}
public static boolean matchValue(String value) {
boolean match = index < rdcheck.value.size() && rdcheck.value.get(index).equals(value);
if (match) index++;
return match;
}
public static Bean toBean(int i) {
if (i >= 0 && i < length) {
return new Bean(type.get(i), value.get(i));
}
return null;
}
public static void main(String[] args) {
//读取词法分析后的文件
if (args.length >= 1) {
File in = new File(args[0]);
try {
reader = new BufferedReader(new FileReader(in));
} catch (FileNotFoundException e) {
e.printStackTrace();
System.exit(1);
}
}
//从lex分析后的文件中获取整个表
type = new ArrayList<>();
value = new ArrayList<>();
sign = new Stack<>();
do {
String line = null;
try {
line = reader.readLine();
} catch (IOException e) {
e.printStackTrace();
}
if (line == null) break;
if (line.trim().length() == 0) continue;
String[] str = line.split(" ");
type.add(str[0]);
value.add(str[1]);
} while (true);
length = Math.min(type.size(), value.size());
//开始检查
while (index < length) {
Bean compUnit = CompUnit();
if (compUnit == null) {
System.out.println("语法出错,最大位置为:line" + max_sign);
System.out.println("对应内容:" + type.get(max_sign) + " " + value.get(max_sign));
for (StackTraceElement element : elements) {
System.out.println(element);
}
System.exit(0);
// index = max_sign + 1;
// continue;
}
}
System.out.println("检查结束");
}
public static Bean CompUnit() {
Bean compUnit = new Bean("CompUnit");
mark();
Bean decl = Decl();
if (decl != null) {
compUnit.add(decl);
Bean compUnit1 = CompUnit();
if (compUnit1 != null)
compUnit.add(compUnit1);
sign.pop();
return compUnit;
}
Bean funcDef = FuncDef();
if (funcDef != null) {
compUnit.add(funcDef);
Bean compUnit1 = CompUnit();
if (compUnit1 != null)
compUnit.add(compUnit1);
sign.pop();
return compUnit;
}
return back();
}
public static Bean Decl() {
Bean decl = new Bean("Decl");
mark();
Bean constDecl = ConstDecl();
if (constDecl != null) {
decl.add(constDecl);
sign.pop();
return decl;
}
Bean varDecl = VarDecl();
if (varDecl != null) {
decl.add(varDecl);
sign.pop();
return decl;
}
return back();
}
public static Bean ConstDecl() {
Bean constDecl = new Bean("ConstDecl");
mark();
if (!matchValue(CONST)) return back();
Bean bType = BType();
if (bType == null) return back();
constDecl.add(bType);
Bean constDef = ConstDef();
if (constDef == null) return back();
constDecl.add(constDef);
while (matchValue(",")) {
constDef = ConstDef();
if (constDef == null) return back();
constDecl.add(constDef);
}
if (!matchValue(";")) return back();
sign.pop();
return constDecl;
}
public static Bean BType() {
Bean bType = new Bean("BType");
mark();
if (!matchValue(INT)) return back();
bType.value = INT;
sign.pop();
return bType;
}
public static Bean ConstDef() {
Bean constDef = new Bean("ConstDef");
mark();
if (!matchType(ID)) return back();
constDef.add(toBean(index - 1));
while (matchValue("[")) {
Bean constExp = ConstExp();
if (constExp == null) return back();
constDef.add(constExp);
if (!matchValue("]")) return back();
}
if (!matchValue("=")) return back();
Bean constInitVal = ConstInitVal();
if (constInitVal == null) return back();
constDef.add(constInitVal);
sign.pop();
return constDef;
}
public static Bean ConstInitVal() {
Bean constInitVal = new Bean("ConstInitVal");
mark();
Bean constExp = ConstExp();
if (constExp != null) {
constInitVal.add(constExp);
sign.pop();
return constInitVal;
}
//force judge
if (!matchValue("{")) return back();
Bean constInitVal1 = ConstInitVal();
//Optional
if (constInitVal1 != null) {
constInitVal.add(constInitVal1);
while (matchValue(",")) {
constInitVal1 = ConstInitVal();
if (constInitVal1 == null) return back();
constInitVal.add(constInitVal1);
}
}
if (!matchValue("}")) return back();
sign.pop();
return constInitVal;
}
public static Bean VarDecl() {
Bean varDecl = new Bean("VarDecl");
mark();
Bean bType = BType();
if (bType == null) return back();
varDecl.add(bType);
Bean varDef = VarDef();
if (varDef == null) return back();
varDecl.add(varDef);
while (matchValue(",")) {
Bean varDef1 = VarDef();
if (varDef1 == null) return back();
varDecl.add(varDef1);
}
if (!matchValue(";")) return back();
sign.pop();
return varDecl;
}
public static Bean VarDef() {
Bean varDef = new Bean("VarDef");
mark();
if (!matchType(ID)) return back();
varDef.add(toBean(index - 1));
while (matchValue("[")) {
Bean constExp = ConstExp();
if (constExp == null) return back();
varDef.add(constExp);
if (!matchValue("]")) return back();
}
//Optional
if (matchValue("=")) {
varDef.add(toBean(index - 1));
Bean initVal = InitVal();
if (initVal == null) return back();
varDef.add(initVal);
}
sign.pop();
return varDef;
}
public static Bean InitVal() {
Bean initVal = new Bean("InitVal");
mark();
Bean exp = Exp();
if (exp != null) {
initVal.add(exp);
sign.pop();
return initVal;
}
if (!matchValue("{")) return back();
Bean initVal1 = InitVal();
//Optional
if (initVal1 != null) {
initVal.add(initVal1);
while (matchValue(",")) {
initVal1 = InitVal();
if (initVal1 == null) return back();
initVal.add(initVal1);
}
}
if (!matchValue("}")) return back();
sign.pop();
return initVal;
}
public static Bean FuncDef() {
Bean funcDef = new Bean("FuncDef");
mark();
Bean funcType = FuncType();
if (funcType == null) return back();
funcDef.add(funcType);
if (!matchType(ID) && !matchValue(MAIN)) return back();
funcDef.add(toBean(index - 1));
if (!matchValue("(")) return back();
//Optional
Bean funcFParams = FuncFParams();
if (funcFParams != null)
funcDef.add(funcFParams);
if (!matchValue(")")) return back();
Bean block = Block();
if (block == null) return back();
funcDef.add(block);
sign.pop();
return funcDef;
}
public static Bean FuncType() {
Bean funcType = new Bean("FuncType");
mark();
if (matchValue(VOID)) {
funcType.value = VOID;
sign.pop();
return funcType;
}
if (matchValue(INT)) {
funcType.value = INT;
sign.pop();
return funcType;
}
return back();
}
public static Bean FuncFParams() {
Bean funcFParams = new Bean("FuncFParams");
mark();
Bean funcFParam = FuncFParam();
if (funcFParam == null) return back();
funcFParams.add(funcFParam);
while (matchValue(",")) {
funcFParam = FuncFParam();
if (funcFParam == null) return back();
funcFParams.add(funcFParam);
}
sign.pop();
return funcFParams;
}
public static Bean FuncFParam() {
Bean funcFParam = new Bean("FuncFParam");
mark();
Bean bType = BType();
if (bType == null) return back();
funcFParam.add(bType);
if (!matchType(ID)) return back();
funcFParam.add(toBean(index - 1));
if (matchValue("[") && matchValue("]"))
while (matchValue("[")) {
Bean exp = Exp();
if (exp == null) return back();
funcFParam.add(exp);
if (!matchValue("]")) return back();
}
sign.pop();
return funcFParam;
}
public static Bean Block() {
Bean block = new Bean("Block");
mark();
if (!matchValue("{")) return back();
Bean blockItem;
while ((blockItem = BlockItem()) != null)
block.add(blockItem);
if (!matchValue("}")) return back();
sign.pop();
return block;
}
public static Bean BlockItem() {
Bean blockItem = new Bean("BlockItem");
mark();
Bean decl = Decl();
if (decl != null) {
blockItem.add(decl);
sign.pop();
return blockItem;
}
Bean stmt = Stmt();
if (stmt != null) {
blockItem.add(stmt);
sign.pop();
return blockItem;
}
return back();
}
public static Bean Stmt() {
Bean stmt = new Bean("Stmt");
mark();
if (matchValue(";")) return stmt;
Bean lVal = LVal();
if (lVal != null) {
stmt.add(lVal);
if (matchValue("=")) {
stmt.add(toBean(index - 1));
Bean exp = Exp();
if (exp != null) {
stmt.add(exp);
if (matchValue(";")) {
sign.pop();
return stmt;
}
}
}
}
reset();
stmt.beans.clear();
Bean exp = Exp();
//Optional
if (exp != null) {
stmt.add(exp);
if (matchValue(";")) {
sign.pop();
return stmt;
}
}
reset();
stmt.beans.clear();
Bean block = Block();
if (block != null) {
stmt.add(block);
sign.pop();
return stmt;
}
reset();
stmt.beans.clear();
if (matchValue(IF)) {
stmt.value = IF;
if (!matchValue("(")) return back();
Bean cond = Cond();
if (cond == null) return back();
stmt.add(cond);
if (!matchValue(")")) return back();
Bean stmt1 = Stmt();
if (stmt1 == null) return back();
stmt1.value = IF_BODY;
stmt.add(stmt1);
if (matchValue(ELSE)) {
Bean stmt2 = Stmt();
if (stmt2 == null) return back();
stmt2.value = ELSE_BODY;
stmt.add(stmt2);
}
sign.pop();
return stmt;
}
if (matchValue(WHILE)) {
stmt.value = WHILE;
if (!matchValue("(")) return back();
Bean cond = Cond();
if (cond == null) return back();
stmt.add(cond);
if (!matchValue(")")) return back();
Bean stmt1 = Stmt();
if (stmt1 == null) return back();
stmt1.value = WHILE_BODY;
stmt.add(stmt1);
sign.pop();
return stmt;
}
if (matchValue(BREAK)) {
stmt.value = BREAK;
if (!matchValue(";")) return back();
sign.pop();
return stmt;
}
if (matchValue(CONTINUE)) {
stmt.value = CONTINUE;
if (!matchValue(";")) return back();
sign.pop();
return stmt;
}
if (matchValue(RETURN)) {
stmt.value = RETURN;
Bean exp1 = Exp();
if (exp1 != null)
stmt.add(exp1);
if (!matchValue(";")) return back();
sign.pop();
return stmt;
}
return back();
}
public static Bean Exp() {
Bean exp = new Bean("Exp");
mark();
Bean addExp = AddExp();
if (addExp == null) return back();
exp.add(addExp);
sign.pop();
return exp;
}
public static Bean Cond() {
Bean cond = new Bean("Cond");
mark();
Bean lOrExp = LOrExp();
if (lOrExp == null) return back();
cond.add(lOrExp);
sign.pop();
return cond;
}
public static Bean LVal() {
Bean lVal = new Bean("LVal");
mark();
if (!matchType(ID)) return back();
lVal.add(toBean(index - 1));
while (matchValue("[")) {
Bean exp = Exp();
if (exp == null) back();
lVal.add(exp);
if (!matchValue("]")) return back();
}
sign.pop();
return lVal;
}
public static Bean PrimaryExp() {
Bean primaryExp = new Bean("PrimaryExp");
mark();
if (matchValue("(")) {
Bean exp = Exp();
if (exp == null) return back();
primaryExp.add(exp);
if (!matchValue(")")) return back();
sign.pop();
return primaryExp;
}
Bean lVal = LVal();
if (lVal != null) {
primaryExp.add(lVal);
sign.pop();
return primaryExp;
}
Bean number = Number();
if (number != null) {
primaryExp.add(number);
sign.pop();
return primaryExp;
}
return back();
}
public static Bean Number() {
Bean number = new Bean("Number");
mark();
if (!matchType(INT_CONST)) return back();
number.add(toBean(index - 1));
sign.pop();
return number;
}
public static Bean UnaryExp() {
Bean unaryExp = new Bean("UnaryExp");
mark();
if (matchType(ID)) {
unaryExp.add(toBean(index - 1));
if (matchValue("(")) {
Bean funcRParams = FuncRParams();
//Optional
if (funcRParams != null)
unaryExp.add(funcRParams);
if (matchValue(")")) {
sign.pop();
return unaryExp;
}
}
}
reset();
unaryExp.beans.clear();
Bean primaryExp = PrimaryExp();
if (primaryExp != null) {
unaryExp.add(primaryExp);
sign.pop();
return unaryExp;
}
Bean unaryOp = UnaryOp();
if (unaryOp != null) {
unaryExp.add(unaryOp);
Bean unaryExp1 = UnaryExp();
if (unaryExp1 == null) return back();
unaryExp.add(unaryExp1);
sign.pop();
return unaryExp;
}
return back();
}
public static Bean UnaryOp() {
Bean unaryOp = new Bean("UnaryOp");
mark();
if (matchValue("+")) {
unaryOp.value = "+";
sign.pop();
return unaryOp;
}
if (matchValue("-")) {
unaryOp.value = "-";
sign.pop();
return unaryOp;
}
if (matchValue("!")) {
unaryOp.value = "!";
sign.pop();
return unaryOp;
}
return back();
}
public static Bean FuncRParams() {
Bean funcRParams = new Bean("FuncRParams");
mark();
Bean exp = Exp();
if (exp == null) return back();
funcRParams.add(exp);
while (matchValue(",")) {
exp = Exp();
if (exp == null) return back();
funcRParams.add(exp);
}
sign.pop();
return funcRParams;
}
public static Bean MulExp() {
Bean mulExp = new Bean("MulExp");
mark();
Bean unaryExp = UnaryExp();
if (unaryExp == null) return back();
mulExp.add(unaryExp);
while (matchValue("*") || matchValue("/") || matchValue("%")) {
mulExp.add(toBean(index - 1));
Bean mulExp1 = MulExp();
if (mulExp1 == null) return back();
mulExp.add(mulExp1);
}
sign.pop();
return mulExp;
}
public static Bean AddExp() {
Bean addExp = new Bean("AddExp");
mark();
Bean mulExp = MulExp();
if (mulExp == null) return back();
addExp.add(mulExp);
while (matchValue("+") || matchValue("-")) {
addExp.add(toBean(index - 1));
Bean addExp1 = AddExp();
if (addExp1 == null) return back();
addExp.add(addExp1);
}
sign.pop();
return addExp;
}
public static Bean RelExp() {
Bean relExp = new Bean("RelExp");
mark();
Bean addExp = AddExp();
if (addExp == null) return back();
relExp.add(addExp);
while (matchValue("<") || matchValue(">") || matchValue("<=") || matchValue(">=")) {
relExp.add(toBean(index - 1));
Bean relExp1 = RelExp();
if (relExp1 == null) return back();
relExp.add(relExp1);
}
sign.pop();
return relExp;
}
public static Bean EqExp() {
Bean eqExp = new Bean("EqExp");
mark();
Bean relExp = RelExp();
if (relExp == null) return back();
eqExp.add(relExp);
while (matchValue("==") || matchValue("!=")) {
eqExp.add(toBean(index - 1));
Bean eqExp1 = EqExp();
if (eqExp1 == null) return back();
eqExp.add(eqExp1);
}
sign.pop();
return eqExp;
}
public static Bean LAndExp() {
Bean lAndExp = new Bean("LAndExp");
mark();
Bean eqExp = EqExp();
if (eqExp == null) return back();
lAndExp.add(eqExp);
while (matchValue("&&")) {
lAndExp.add(toBean(index - 1));
Bean lAndExp1 = LAndExp();
if (lAndExp1 == null) return back();
lAndExp.add(lAndExp1);
}
sign.pop();
return lAndExp;
}
public static Bean LOrExp() {
Bean lOrExp = new Bean("LOrExp");
mark();
Bean lAndExp = LAndExp();
if (lAndExp == null) return back();
lOrExp.add(lAndExp);
while (matchValue("||")) {
lOrExp.add(toBean(index - 1));
Bean lOrExp1 = LOrExp();
if (lOrExp1 == null) return back();
lOrExp.add(lOrExp1);
}
sign.pop();
return lOrExp;
}
public static Bean ConstExp() {
Bean constExp = new Bean("ConstExp");
mark();
Bean addExp = AddExp();
if (addExp == null) return back();
constExp.add(addExp);
sign.pop();
return constExp;
}
}