我需要翻译eCmascript语法这一部分的帮助?
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30-09-2019 - |
题
我已经从事自己的Ecmascript实施了一段时间。我基本上已经手工完成了所有操作,以帮助深入了解该过程。反复尝试分析和理解语法的这一部分失败了,因此我一直在研究项目的其他部分,但是现在我正在努力研究对象文字,因此我真的需要抛光我的句法分析仪。谁能用语言解析器新手可以理解的话语?
我最大的混乱来源是:
新的memberexpression参数
这应该是会员表达式,但这似乎与以下内容相抵触:
NewExpression : MemberExpression new NewExpression
新表达式是成员表达式还是左手侧表达式?老实说,我很难为具体语法提供适当的C#课程。
MemberExpression : PrimaryExpression FunctionExpression MemberExpression [ Expression ] MemberExpression . IdentifierName new MemberExpression Arguments NewExpression : MemberExpression new NewExpression CallExpression : MemberExpression Arguments CallExpression Arguments CallExpression [ Expression ] CallExpression . IdentifierName LeftHandSideExpression : NewExpression CallExpression
这是我一直在使用的课堂设计,但是随着我继续研究规格,我的疑问不会消失。
public abstract class LeftHandSideExpression : ConcreteExpression
{
}
public sealed class NewExpression : LeftHandSideExpression
{
public NewExpression(MemberExpression memberExpression, Arguments arguments)
{
}
public NewExpression(NewExpression newExpression, Arguments arguments)
{
}
}
public sealed class CallExpression : LeftHandSideExpression
{
public CallExpression(MemberExpression memberExpression, Arguments arguments)
{
}
public CallExpression(CallExpression callExpression, Arguments arguments)
{
}
}
public sealed class MemberExpression : ConcreteExpression
{
public MemberExpression(PrimaryExpression primaryExpression)
{
}
public MemberExpression(PrimaryExpression primaryExpression, string identifierName)
{
}
public MemberExpression(PrimaryExpression primaryExpression, ConcreteExpression indexerExpression)
{
}
public MemberExpression(FunctionExpression functionExpression)
{
}
public MemberExpression(FunctionExpression functionExpression, string identifierName)
{
}
public MemberExpression(FunctionExpression functionExpression, ConcreteExpression indexerExpression)
{
}
}
根据安迪的回答,我提出了一种有意义的新设计。
public abstract class LeftHandSideExpression : ConcreteExpression
{
public ConcreteExpression Expression { get; private set; }
protected LeftHandSideExpression(ConcreteExpression expression)
{
Expression = expression;
}
}
public class NewExpression : LeftHandSideExpression
{
public Arguments Arguments { get; private set; }
protected NewExpression(PrimaryExpression primaryExpression)
: base(primaryExpression)
{
}
protected NewExpression(FunctionExpression functionExpression)
: base(functionExpression)
{
}
protected NewExpression(MemberExpression memberExpression)
: base(memberExpression)
{
}
protected NewExpression(CallExpression callExpression)
: base(callExpression)
{
}
public NewExpression(MemberExpression memberExpression, Arguments arguments)
: base(memberExpression)
{
Arguments = arguments;
}
public NewExpression(NewExpression newExpression, Arguments arguments)
: base(newExpression)
{
Arguments = arguments;
}
}
public sealed class CallExpression : LeftHandSideExpression
{
public Arguments Arguments { get; private set; }
public CallExpression(MemberExpression memberExpression, Arguments arguments)
: base(memberExpression)
{
Arguments = arguments;
}
public CallExpression(CallExpression callExpression, Arguments arguments)
: base(callExpression)
{
Arguments = arguments;
}
}
public class MemberExpression : NewExpression
{
public MemberExpression(PrimaryExpression primaryExpression)
: base(primaryExpression)
{
}
public MemberExpression(FunctionExpression functionExpression)
: base(functionExpression)
{
}
public MemberExpression(MemberExpression memberExpression)
: base(memberExpression)
{
}
protected MemberExpression(CallExpression callExpression)
: base(callExpression)
{
}
}
public sealed class DotPropertyAccessExpression : MemberExpression
{
public string IdentifierName { get; private set; }
public DotPropertyAccessExpression(PrimaryExpression primaryExpression, string identifierName)
: base(primaryExpression)
{
IdentifierName = identifierName;
}
public DotPropertyAccessExpression(FunctionExpression functionExpression, string identifierName)
: base(functionExpression)
{
IdentifierName = identifierName;
}
public DotPropertyAccessExpression(MemberExpression memberExpression, string identifierName)
: base(memberExpression)
{
IdentifierName = identifierName;
}
public DotPropertyAccessExpression(CallExpression callExpression, string identifierName)
: base(callExpression)
{
IdentifierName = identifierName;
}
}
public sealed class BracketPropertyAccessExpression : MemberExpression
{
public ConcreteExpression IndexerExpression { get; private set; }
public BracketPropertyAccessExpression(PrimaryExpression primaryExpression, ConcreteExpression indexerExpression)
: base(primaryExpression)
{
IndexerExpression = indexerExpression;
}
public BracketPropertyAccessExpression(FunctionExpression functionExpression, ConcreteExpression indexerExpression)
: base(functionExpression)
{
IndexerExpression = indexerExpression;
}
public BracketPropertyAccessExpression(MemberExpression memberExpression, ConcreteExpression indexerExpression)
: base(memberExpression)
{
IndexerExpression = indexerExpression;
}
public BracketPropertyAccessExpression(CallExpression callExpression, ConcreteExpression indexerExpression)
: base(callExpression)
{
IndexerExpression = indexerExpression;
}
}
解决方案
这是可视化它的另一种方式。这是我在第11.2节中看到制作的一般层次结构的方式:
LeftHandSideExpression :
NewExpression :
MemberExpression :
PrimaryExpression
FunctionExpression
MemberExpression [ Expression ]
MemberExpression . IdentifierName
new MemberExpression Arguments
new NewExpression
CallExpression :
MemberExpression Arguments
CallExpression Arguments
CallExpression [ Expression ]
CallExpression . IdentifierName
看起来MembereXpressions是新的Expressions,反过来又是左侧表达式。我希望这有帮助。
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