元素可以包含ANTLR生成的解析器解析的属性吗?如果是这样，怎么办? [英] can an element contain attribute as parsed by parser generated by ANTLR? if so, how?
问题描述
我正在关注本教程，并成功复制了其行为，但我使用的是Antlr 4.7，而不是本教程使用的4.5.
I am following this tutorial and successfully replicated its behavior except that I am using Antlr 4.7 instead of the 4.5 that the tutorial was using.
我正在尝试为费用跟踪器构建DSL.
I am trying to build a DSL for expense tracker.
想知道每个元素是否可以具有属性吗?
Was wondering if each element can have attributes?
例如这就是现在的样子
This is the code for the todo.g4 as seen in https://github.com/simkimsia/learn-antlr-web-js/blob/master/todo.g4
grammar todo;
elements
: (element|emptyLine)* EOF
;
element
: '*' ( ' ' | '\t' )* CONTENT NL+
;
emptyLine
: NL
;
NL
: '\r' | '\n'
;
CONTENT
: [a-zA-Z0-9_][a-zA-Z0-9_ \t]*
;
表示元素还将具有2个属性，例如金额和收款人.为简单起见，我将使用相同的句子结构，以便更轻松地进行解析.
Meaning to say the element will also have 2 attributes such as amount and payee. To keep it simple, I will have the same sentence structure so to allow parsing to be done more easily.
格式为pay [payee] [amount]
示例为pay Acme Corp 123,789.45
所以收款人是Acme Corp，金额是12378945，用整数表示，表示以美分计的金额
so the payee is Acme Corp and the amount is 12378945 as expressed in integers to denote the amount in denominations of cents
另一个例子是pay Banana Inc 700
所以收款人是Banana Inc，金额为70000，用整数表示，表示以美分计的金额
so the payee is Banana Inc and the amount is 70000 as expressed in integers to denote the amount in denominations of cents
我猜我需要更改todo.g4，然后重新生成解析器.
I am guessing I need to change the todo.g4 and then re generate the parser.
一个元素可以具有其他属性吗? 如果是这样，我该如何开始?
Can an element have other attributes? If so, how do I get started?
更新
这是我的最新尝试，其最新动态排在首位:
This is my latest attempts ranked with latest updates on top:
我只是想出了如何使用grun和testRig.感谢@Raven的提示.
I just figured out how to use grun and testRig. Thanks @Raven for that tip.
最新尝试:我最近的费用.g4(与之前尝试的唯一区别是付款的正则表达式)
latest attempt: My latest expense.g4 (only difference from earlier attempt is the regex for payment)
grammar expense;
payments: (payment NL)* ;
payment: PAY receiver amount=NUMBER ;
receiver: surname=ID (lastname=ID)? ;
PAY: 'pay' ;
NUMBER: ([0-9]+(','[0-9]+)*)('.'[0-9]*)?;
ID: [a-zA-Z0-9_]+ ;
NL: '\n' | '\r\n' ;
WS: [\t ]+ -> skip ;
更早的尝试:这是我的费用.g4
Earlier attempt: This is my expense.g4
grammar expense;
payments: (payment NL)* ;
payment: PAY receiver amount=NUMBER ;
receiver: surname=ID (lastname=ID)? ;
PAY: 'pay' ;
NUMBER: [0-9]+ (',' [0-9]+)+ ('.' [0-9]+)? ;
ID: [a-zA-Z0-9_]+ ;
NL: '\n' | '\r\n' ;
WS: [\t ]+ -> skip ;
推荐答案
情况为2017年10月24日UTC + 1.
Situation on October 24. 2017 at 19:00 UTC+1.
您的语法运作完美.我用Java进行了完整的测试.
Your grammar works perfectly. I made a full test in Java.
文件Expense.g4:
grammar Expense;
payments
@init {System.out.println("Expense last update 1853");}
: (payment NL)*
;
payment
: PAY receiver amount=NUMBER
{System.out.println("Payement found " + $amount.text + " to " + $receiver.text);}
;
receiver
: surname=ID (lastname=ID)?
;
PAY : 'pay' ;
NUMBER : ([0-9]+(','[0-9]+)*)('.'[0-9]*)? ;
ID : [a-zA-Z0-9_]+ ;
NL : '\n' | '\r\n' ;
WS : [\t ]+ -> channel(HIDDEN) ; // keep the spaces (witout spaces ==> paydeltaco98)
文件ExpenseMyListener.java:
public class ExpenseMyListener extends ExpenseBaseListener {
ExpenseParser parser;
public ExpenseMyListener(ExpenseParser parser) { this.parser = parser; }
public void exitPayments(ExpenseParser.PaymentsContext ctx) {
System.out.println(">>> in ExpenseMyListener for paymentsss");
System.out.println(">>> there are " + ctx.payment().size() + " elements in the list of payments");
for (int i = 0; i < ctx.payment().size(); i++) {
System.out.println(ctx.payment(i).getText());
}
}
public void exitPayment(ExpenseParser.PaymentContext ctx) {
System.out.println(">>> in ExpenseMyListener for payment");
System.out.println(parser.getTokenStream().getText(ctx));
}
}
文件test_expense.java:
import org.antlr.v4.runtime.ANTLRFileStream;
import org.antlr.v4.runtime.ANTLRInputStream;
import org.antlr.v4.runtime.CommonTokenStream;
import org.antlr.v4.runtime.ParserRuleContext;
import org.antlr.v4.runtime.tree.*;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.IOException;
public class test_expense {
public static void main(String[] args) throws IOException {
ANTLRInputStream input = new ANTLRFileStream(args[0]);
ExpenseLexer lexer = new ExpenseLexer(input);
CommonTokenStream tokens = new CommonTokenStream(lexer);
ExpenseParser parser = new ExpenseParser(tokens);
ParseTree tree = parser.payments();
System.out.println("---parsing ended");
ParseTreeWalker walker = new ParseTreeWalker();
ExpenseMyListener my_listener = new ExpenseMyListener(parser);
System.out.println(">>>> about to walk");
walker.walk(my_listener, tree);
}
}
输入文件top.text:
pay Acme Corp 123,456
pay Banana Inc 456789.00
pay charlie pte 123,456.89
pay delta co 98
执行:
$ export CLASSPATH=".:/usr/local/lib/antlr-4.6-complete.jar"
$ alias
alias a4='java -jar /usr/local/lib/antlr-4.6-complete.jar'
alias grun='java org.antlr.v4.gui.TestRig'
$ a4 Expense.g4
$ javac Ex*.java
$ javac test_expense.java
$ grun Expense payments -tokens -diagnostics top.text
[@0,0:2='pay',<'pay'>,1:0]
[@1,3:3=' ',<WS>,channel=1,1:3]
[@2,4:7='Acme',<ID>,1:4]
[@3,8:8=' ',<WS>,channel=1,1:8]
[@4,9:12='Corp',<ID>,1:9]
...
[@32,90:89='<EOF>',<EOF>,5:0]
Expense last update 1853
Payement found 123,456 to Acme Corp
Payement found 456789.00 to Banana Inc
Payement found 123,456.89 to charlie pte
Payement found 98 to delta co
$ java test_expense top.text
Expense last update 1853
Payement found 123,456 to Acme Corp
Payement found 456789.00 to Banana Inc
Payement found 123,456.89 to charlie pte
Payement found 98 to delta co
---parsing ended
>>>> about to walk
>>> in ExpenseMyListener for payment
pay Acme Corp 123,456
>>> in ExpenseMyListener for payment
pay Banana Inc 456789.00
>>> in ExpenseMyListener for payment
pay charlie pte 123,456.89
>>> in ExpenseMyListener for payment
pay delta co 98
>>> in ExpenseMyListener for paymentsss
>>> there are 4 elements in the list of payments
payAcmeCorp123,456
payBananaInc456789.00
paycharliepte123,456.89
paydeltaco98
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