https://craftinginterpreters.com/contents.html

https://github.com/GuoYaxiang/craftinginterpreters_zh

https://space.bilibili.com/44550904

接上一节，实现变量的解析和绑定，实现正确的作用域。

id="environment">Environment

(values.containsKey(name.lexeme))
{return
(values.containsKey(name.lexeme))
value);return;}if
ancestor(distance).values.get(name);}void
assignAt(int
{ancestor(distance).values.put(name.lexeme,
value);}Environment
id="functiontype">FunctionType

id="interpreter">Interpreter

Expr.Visitor<Object>,Stmt.Visitor<Void>
{final
HashMap<>();Interpreter()
new
(double)System.currentTimeMillis()
String
{Lox.runtimeError(error);}}private
void
Environment(environment));return
null;}void
evaluate(expr.right);}@Overridepublic
Object
visitGroupingExpr(Expr.Grouping
expr)
evaluate(expr.expression);}@Overridepublic
Void
evaluate(stmt.initializer);}environment.define(stmt.name.lexeme,
value);return
(isTruthy(evaluate(stmt.condition)))
Object
{environment.assignAt(distance,
expr.name,
visitVariableExpr(Expr.Variable
expr)
globals.get(name);}}@Overridepublic
Object
evaluate(expr.right);checkNumberOperand(expr.operator,
right);return
GREATER:checkNumberOperands(expr.operator,
left,
GREATER_EQUAL:checkNumberOperands(expr.operator,
left,
LESS:checkNumberOperands(expr.operator,
left,
LESS_EQUAL:checkNumberOperands(expr.operator,
left,
MINUS:checkNumberOperands(expr.operator,
left,
RuntimeError(expr.operator,"Operands
must
SLASH:checkNumberOperands(expr.operator,
left,
STAR:checkNumberOperands(expr.operator,
left,
evaluate(expr.callee);List<Object>
arguments
{arguments.add(evaluate(argument));}if
(!(callee
expr.accept(this);}@Overridepublic
Void
visitExpressionStmt(Stmt.Expression
stmt)
{evaluate(stmt.expression);return
Void
visitFunctionStmt(Stmt.Function
stmt)
environment);environment.define(stmt.name.lexeme,
function);return
(isTruthy(evaluate(stmt.condition)))
else
{execute(stmt.elseBranch);}return
Void
evaluate(stmt.expression);System.out.println(stringify(value));return
Void
FunctionType.NONE;Resolver(Interpreter
interpreter)
{beginScope();resolve(stmt.statements);endScope();return
Void
{resolve(stmt.initializer);}define(stmt.name);return
Void
{resolve(expr.value);resolveLocal(expr,
expr.name);return
visitVariableExpr(Expr.Variable
expr)
&&scopes.peek().get(expr.name.lexeme)
Boolean.FALSE)
initializer.");}resolveLocal(expr,
expr.name);return
visitFunctionStmt(Stmt.Function
stmt)
{declare(stmt.name);define(stmt.name);resolveFunction(stmt,
Void
visitExpressionStmt(Stmt.Expression
stmt)
{resolve(stmt.expression);return
Void
{resolve(stmt.condition);resolve(stmt.thenBranch);if
(stmt.elseBranch
resolve(stmt.elseBranch);return
Void
{resolve(stmt.expression);return
Void
{resolve(stmt.condition);resolve(stmt.body);return
Void
{resolve(expr.left);resolve(expr.right);return
Void
visitGroupingExpr(Expr.Grouping
expr)
{resolve(expr.expression);return
Void
{resolve(expr.left);resolve(expr.right);return
Void
(scope.containsKey(name.lexeme))
variable
scope.");}scope.put(name.lexeme,
false);}private
return;scopes.peek().put(name.lexeme,
true);}private
(scopes.get(i).containsKey(name.lexeme))
scopes.size()
currentFunction;currentFunction
(Token
{declare(param);define(param);}resolve(function.body);endScope();currentFunction
enclosingFunction;}
根据实际情况填写runFile("C:\\work\\workspace\\demo\\src\\main\\java\\com\\jiangbo\\lox\\test.lox");}private
static
Files.readAllBytes(Paths.get(path));run(new
String(bytes,
InputStreamReader(System.in);BufferedReader
reader
Scanner(source);List<Token>
tokens
Parser(tokens);List<Stmt>
statements
Resolver(interpreter);resolver.resolve(statements);//
Stop
return;interpreter.interpret(statements);}static
void
{System.err.println(error.getMessage()
+"\n[line
省略了其余的类，程序现在可以支持函数的定义和调用。