public static void main(String[] argv) {
/* Node root = new Node();
root.setUserObject("root");
Node r = new Node();
r.setUserObject("r");
Node q = new Node();
q.setUserObject("q");
root.addNode(q);
root.addNode(r);
Node a = new Node();
a.setUserObject("a");
q.addNode(a);
// System.out.println(root.deepTrans(root));
// System.out.println(root.deepTrans(root.clone()));
Node x = new Node();
x.setUserObject("x");
Node y = new Node();
y.setUserObject("y");
Node z = new Node();
z.setUserObject("z");
x.addNode(y);
x.addNode(z);
System.out.println(x.deepTrans(x.clone()));
*/
ExpressionParser p = new ExpressionParser();
Node<Token> n = p.parse("(a or b) and c or d and f");
System.out.println(n);
System.out.println(ExpressionParser.getExpressionString(n));
}
@Override
public Object excute(String id, String expression) {
try {
ExpressionParser parser = new ExpressionParser(id, expression);
Node rootNode = parser.parser();
rootNode.execute(mPage);
return rootNode.getValue();
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
@Override
public Expression toExpression(List<Symbol> symbols)
throws ParserSymbolHandleException, VariableCycleException {
this.symbols = symbols;
this.symbols.add(new EndSymbol());
ExpressionParser ep = new ExpressionParser(this);
returnExpression = ep.toExpression(symbols);
symbols.get(0).accept(new EndSymbolVisitor());
return returnExpression;
}
public static void main(String[] args) {
// 创建一个ExpressionParser对象，用于解析表达式
ExpressionParser parser = new SpelExpressionParser();
List<String> list = new ArrayList<String>();
list.add("疯狂Java讲义");
list.add("疯狂Ajax讲义");
list.add("疯狂XML讲义");
list.add("经典Java EE企业应用实战");
EvaluationContext ctx = new StandardEvaluationContext();
ctx.setVariable("mylist", list);
// 得到的新集合的元素是原集合的每个元素length()方法返回值
Expression expr = parser.parseExpression("#mylist.![length()]");
System.out.println(expr.getValue(ctx));
List<Person> list2 = new ArrayList<Person>();
list2.add(new Person(1, "孙悟空", 162));
list2.add(new Person(1, "猪八戒", 182));
list2.add(new Person(1, "牛魔王", 195));
ctx.setVariable("mylist2", list2);
// 得到的新集合的元素是原集合的每个元素name属性值
expr = parser.parseExpression("#mylist2.![name]");
System.out.println(expr.getValue(ctx));
}
@Override
public LogQueryCommand parse(LogQueryContext context, String commandString) {
// find assignment symbol
int p = QueryTokenizer.findKeyword(commandString, "=");
if (p < 0) throw new LogQueryParseException("assign-token-not-found", commandString.length());
String field = commandString.substring(COMMAND.length(), p).trim();
String exprToken = commandString.substring(p + 1).trim();
if (field.isEmpty())
throw new LogQueryParseException("field-name-not-found", commandString.length());
if (exprToken.isEmpty())
throw new LogQueryParseException("expression-not-found", commandString.length());
Expression expr = ExpressionParser.parse(exprToken);
return new Eval(field, expr);
}
/**
* Parse a Triangle SingleDeclarationParser.
*
* <p>Single-Declaration ::= const Identifier ~ Expression | var Identifier : Type-Denoter | proc
* Identifier (Formal-Parameter-Sequence) ~ Single-Command | func Identifier
* (Formal-Parameter-Sequence) : Type-Denoter ~ Expression | Type Identifier ~ Type-Denoter
*
* <p>To be overridden by the specialized command parse subclasses.
*
* @param token the initial token.
* @return the root node of the generated parse tree.
* @throws Exception if an error occurred.
*/
public void parse(Token token) throws Exception {
SingleCommandParser singleCommand = null;
ExpressionParser expression = null;
FormalParameterSequenceParser formalParameterSequence = null;
TypeDenoterParser typeDenoter = null;
EnumSet<TriangleTokenType> syncSet = null;
TypeSpec identifierType = TrianglePredefined.undefinedType;
Token identifierToken = null;
ICode routineICode = null;
token = currentToken();
switch ((TriangleTokenType) token.getType()) {
case CONST:
identifierToken = nextToken();
syncSet = EnumSet.of(TILDE);
syncSet.addAll(ExpressionParser.FIRST_FOLLOW_SET);
synchronize(IDENTIFIER, MISSING_IDENTIFIER, syncSet);
syncSet.remove(TILDE);
token = synchronize(TILDE, MISSING_TILDE, syncSet);
expression = new ExpressionParser(this);
ICodeNode expressionNode = expression.parse(token);
SymTabEntry constantId = symTabStack.lookupLocal(identifierToken.getText().toLowerCase());
// Enter the new identifier into the symbol table
// but don't set how it's defined yet.
if (constantId == null) {
constantId = symTabStack.enterLocal(identifierToken.getText().toLowerCase());
constantId.setDefinition(DefinitionImpl.CONSTANT);
constantId.setAttribute(CONSTANT_VALUE, expressionNode);
constantId.appendLineNumber(identifierToken.getLineNumber());
constantId.setTypeSpec(expressionNode.getTypeSpec());
} else {
errorHandler.flag(identifierToken, IDENTIFIER_REDEFINED, this);
}
break;
case VAR:
identifierToken = nextToken();
syncSet = EnumSet.of(COLON);
syncSet.addAll(TypeDenoterParser.FIRST_FOLLOW_SET);
synchronize(IDENTIFIER, MISSING_IDENTIFIER, syncSet);
syncSet.remove(COLON);
token = synchronize(COLON, MISSING_COLON, syncSet);
typeDenoter = new TypeDenoterParser(this);
identifierType = typeDenoter.parse(token);
SymTabEntry variableId = symTabStack.lookupLocal(identifierToken.getText().toLowerCase());
// Enter the new identifier into the symbol table
// but don't set how it's defined yet.
if (variableId == null) {
variableId = symTabStack.enterLocal(identifierToken.getText().toLowerCase());
variableId.setDefinition(DefinitionImpl.VARIABLE);
variableId.appendLineNumber(identifierToken.getLineNumber());
variableId.setTypeSpec(identifierType);
} else {
errorHandler.flag(identifierToken, IDENTIFIER_REDEFINED, this);
}
break;
case PROC:
identifierToken = nextToken();
routineICode = ICodeFactory.createICode();
syncSet = EnumSet.of(LEFT_PAREN);
syncSet.addAll(FormalParameterSequenceParser.FIRST_FOLLOW_SET);
token = synchronize(IDENTIFIER, MISSING_IDENTIFIER, syncSet);
syncSet.remove(LEFT_PAREN);
token = synchronize(LEFT_PAREN, MISSING_LEFT_PAREN, syncSet);
SymTabEntry procId = symTabStack.lookupLocal(identifierToken.getText().toLowerCase());
// Enter the new identifier into the symbol table
// but don't set how it's defined yet.
if (procId == null) {
procId = symTabStack.enterLocal(identifierToken.getText().toLowerCase());
procId.setTypeSpec(TrianglePredefined.undefinedType);
procId.setDefinition(DefinitionImpl.PROCEDURE);
procId.appendLineNumber(identifierToken.getLineNumber());
procId.setAttribute(ROUTINE_SYMTAB, symTabStack.push());
procId.setAttribute(ROUTINE_ICODE, routineICode);
} else {
errorHandler.flag(identifierToken, IDENTIFIER_REDEFINED, this);
procId = null;
}
formalParameterSequence = new FormalParameterSequenceParser(this);
ArrayList<SymTabEntry> procParamList = formalParameterSequence.parse(token);
syncSet = EnumSet.of(TILDE);
syncSet.addAll(SingleCommandParser.FIRST_FOLLOW_SET);
token = synchronize(RIGHT_PAREN, MISSING_RIGHT_PAREN, syncSet);
syncSet.remove(TILDE);
token = synchronize(TILDE, MISSING_TILDE, syncSet);
singleCommand = new SingleCommandParser(this);
routineICode.setRoot(singleCommand.parse(token));
if (procId != null) {
procId.setAttribute(ROUTINE_PARMS, procParamList);
}
symTabStack.pop();
break;
case FUNC:
identifierToken = nextToken();
routineICode = ICodeFactory.createICode();
SymTabEntry funcId = symTabStack.lookupLocal(identifierToken.getText().toLowerCase());
// Enter the new identifier into the symbol table
// but don't set how it's defined yet.
if (funcId == null) {
funcId = symTabStack.enterLocal(identifierToken.getText().toLowerCase());
funcId.setDefinition(DefinitionImpl.FUNCTION);
funcId.appendLineNumber(identifierToken.getLineNumber());
funcId.setTypeSpec(TrianglePredefined.undefinedType);
funcId.setAttribute(ROUTINE_SYMTAB, symTabStack.push());
funcId.setAttribute(ROUTINE_ICODE, routineICode);
} else {
errorHandler.flag(identifierToken, IDENTIFIER_REDEFINED, this);
funcId = null;
}
syncSet = EnumSet.of(LEFT_PAREN);
syncSet.addAll(FormalParameterSequenceParser.FIRST_FOLLOW_SET);
token = synchronize(IDENTIFIER, MISSING_IDENTIFIER, syncSet);
syncSet.remove(LEFT_PAREN);
token = synchronize(LEFT_PAREN, MISSING_LEFT_PAREN, syncSet);
formalParameterSequence = new FormalParameterSequenceParser(this);
ArrayList<SymTabEntry> funcParamList = formalParameterSequence.parse(token);
syncSet = EnumSet.of(COLON);
syncSet.addAll(TypeDenoterParser.FIRST_FOLLOW_SET);
synchronize(RIGHT_PAREN, MISSING_RIGHT_PAREN, syncSet);
syncSet.remove(COLON);
token = synchronize(COLON, MISSING_COLON, syncSet);
Token typeToken = currentToken();
typeDenoter = new TypeDenoterParser(this);
TypeSpec funcType = typeDenoter.parse(token);
syncSet = ExpressionParser.FIRST_FOLLOW_SET.clone();
token = synchronize(TILDE, MISSING_TILDE, syncSet);
expression = new ExpressionParser(this);
routineICode.setRoot(expression.parse(token));
if (funcId != null) {
funcId.setTypeSpec(funcType);
funcId.setAttribute(ROUTINE_PARMS, funcParamList);
if (!routineICode.getRoot().getTypeSpec().equals(funcType)) {
errorHandler.flag(typeToken, RETURN_TYPE_MISMATCH, this);
}
}
symTabStack.pop();
break;
case TYPE:
identifierToken = nextToken();
syncSet = EnumSet.of(TILDE);
syncSet.addAll(TypeDenoterParser.FIRST_FOLLOW_SET);
synchronize(IDENTIFIER, MISSING_IDENTIFIER, syncSet);
syncSet.remove(TILDE);
token = synchronize(TILDE, MISSING_TILDE, syncSet);
typeDenoter = new TypeDenoterParser(this);
TypeSpec typeType = typeDenoter.parse(token);
SymTabEntry typeId = symTabStack.lookupLocal(identifierToken.getText().toLowerCase());
// Enter the new identifier into the symbol table
// but don't set how it's defined yet.
if (typeId == null) {
typeId = symTabStack.enterLocal(identifierToken.getText().toLowerCase());
typeId.setDefinition(DefinitionImpl.TYPE);
typeId.appendLineNumber(identifierToken.getLineNumber());
typeId.setTypeSpec(typeType);
} else {
errorHandler.flag(token, IDENTIFIER_REDEFINED, this);
}
break;
default:
errorHandler.flag(token, MISSING_DECLARATION, this);
break;
}
}
public static ExpressionItem parse(String value) throws Exception {
ExpressionParser parser = new ExpressionParser(convert(value));
ExpressionItem item = parser.parse();
return item;
}
public static List<ExpressionItem> parseArithmeticExpressions(String value) throws Exception {
List<ExpressionItem> items;
ExpressionParser parser = new ExpressionParser(convert(value));
items = parser.parseArithmeticExpressions();
return items;
}
/**
* 解析IK简易查询表达式
*
* @param ikQueryExp
* @return Query 查询逻辑对象
*/
public static Query parse(String ikQueryExp) {
ExpressionParser ikExpParser = new ExpressionParser();
return ikExpParser.parserExp(ikQueryExp);
}
public Object eval(Map<String, Object> env) {
return parent.getCurrentDate();
}
