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Sat, 9 Apr 2016 11:07:36 -0400 (EDT) X-Original-To: hangout-at-www.mrbrklyn.com Delivered-To: hangout-at-www.mrbrklyn.com Received: by mrbrklyn.com (Postfix, from userid 1000) id 288EE161914; Sat, 9 Apr 2016 11:07:26 -0400 (EDT) Resent-From: Ruben Safir Resent-Date: Sat, 9 Apr 2016 11:07:25 -0400 Resent-Message-ID: <20160409150725.GA3493-at-www.mrbrklyn.com> Resent-To: hangout-at-mrbrklyn.com X-Original-To: ruben-at-mrbrklyn.com Delivered-To: ruben-at-mrbrklyn.com Received: from B-EXH-EDGE1.liunet.edu (b-edge1.smtp.liu.edu [148.4.248.206]) by mrbrklyn.com (Postfix) with ESMTP id 15155161914 for ; Sat, 9 Apr 2016 09:19:16 -0400 (EDT) Received: from B-EXH-3.liunet.edu (148.4.250.212) by B-EXH-EDGE1.liunet.edu (148.4.248.206) with Microsoft SMTP Server (TLS) id 14.3.210.2; Sat, 9 Apr 2016 09:19:01 -0400 Received: from localhost (96.250.202.133) by B-EXH-3.liunet.edu (148.4.250.212) with Microsoft SMTP Server (TLS) id 15.0.1156.6; Sat, 9 Apr 2016 09:19:14 -0400 From: Christopher League To: Ruben Safir , Hangout In-Reply-To: <5708706F.5040305-at-mrbrklyn.com> References: <5708706F.5040305-at-mrbrklyn.com> User-Agent: Notmuch/0.21 (http://notmuchmail.org) Emacs/24.5.1 (x86_64-unknown-linux-gnu) Date: Sat, 9 Apr 2016 09:19:13 -0400 Message-ID: <87lh4m7wdq.fsf-at-lydrik.home.lan> MIME-Version: 1.0 X-Originating-IP: [96.250.202.133] X-ClientProxiedBy: U-EXH-CAS.liunet.edu (148.4.184.26) To B-EXH-3.liunet.edu (148.4.250.212) X-UID: 18748 X-Content-Filtered-By: Mailman/MimeDel 2.1.17 Subject: Re: [Hangout-NYLXS] Antlr visitor Programming - kicking it around X-BeenThere: hangout-at-nylxs.com X-Mailman-Version: 2.1.17 Precedence: list Reply-To: NYLXS Discussions List List-Id: NYLXS Discussions List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============0359403622==" Errors-To: hangout-bounces-at-nylxs.com Sender: "hangout" --===============0359403622== Content-Type: multipart/alternative; boundary="=-=-=" --=-=-= Content-Type: text/plain > So I'm only visiting visitAssignID and visitQuantity and > visitVariables? Not even visitQuantity, I think. The purpose of `CollectVarsVisitor` was to "traverse a parse tree for the calculator language and just keep track of the set of identifiers that are being referenced (assigned or retrieved) in the program." If we look at the grammar: stmt : ID '=' expr #assignID | 'print' expr #print ; expr : '-' expr #negative | expr ('*' | '/') expr #products_quotents | expr ('+'|'-') expr #sums | '(' expr ')' #parans |NUM #quantity |ID #variables ; The only place that a variable is assigned is in `#assignID` and the only place a variable is retrieved is in `#variables`. So those are the only two visit methods we'd need to fulfill the purpose of `CollectVarsVisitor`. The `AssignIDContext` and `VariablesContext` will each have a `ctx.ID()` because ID appears in both of those rules. And because it appears exactly once in each, the method returns just a single `TerminalNode`, rather than a list of them. The other contexts (tree nodes) don't have any ID, so there is no `ctx.ID()` method in those. CL Ruben Safir writes: > So kicking this around, forget that this HW is now a month old... > > I did this which fails, and I know why...I think > > > Note that it fails on contex objects that have no ID() > > > import org.antlr.v4.runtime.ANTLRInputStream; > import org.antlr.v4.runtime.CommonTokenStream; > import org.antlr.v4.runtime.tree.ParseTree; > import org.antlr.v4.runtime.tree.TerminalNode; > import org.antlr.v4.runtime.*; > import org.antlr.v4.runtime.tree.*; > import java.util.HashSet; > > public class CollectVarsVisitor extends CalcBaseVisitor { > HashSet vars = new HashSet(); > > //STMT > -at-Override > public Void visitAssignID(CalcParser.AssignIDContext ctx) { > TerminalNode id = ctx.ID(); > if(id != null) { > System.out.println(id.getText()); > vars.add(id.getText()); > } > return super.visitAssignID(ctx); > } > > -at-Override > public Void visitPrint(CalcParser.PrintContext ctx) { > TerminalNode id = ctx.ID(); > if(id != null) { > System.out.println(id.getText()); > vars.add(id.getText()); > } > return super.visitPrint(ctx); > } > > //EXPR > > -at-Override > public Void visitNegative(CalcParser.NegativeContext ctx) { > TerminalNode id = ctx.ID(); > if(id != null) { > System.out.println("expresion: " + id.getText()); > vars.add(id.getText()); > } > return super.visitNegative(ctx); > } > > > -at-Override > public Void visitProducts_quotents(CalcParser.Products_quotentsContext ctx) { > TerminalNode id = ctx.ID(); > if(id != null) { > System.out.println("expresion: " + id.getText()); > vars.add(id.getText()); > } > return super.visitProducts_quotents(ctx); > } > > -at-Override > public Void visitSums(CalcParser.SumsContext ctx) { > TerminalNode id = ctx.ID(); > if(id != null) { > System.out.println("expresion: " + id.getText()); > vars.add(id.getText()); > } > return super.visitSums(ctx); > } > > -at-Override > public Void visitParans(CalcParser.ParansContext ctx) { > TerminalNode id = ctx.ID(); > if(id != null) { > System.out.println("expresion: " + id.getText()); > vars.add(id.getText()); > } > return super.visitParans(ctx); > } > > -at-Override > public Void visitQuantity(CalcParser.QuantityContext ctx) { > TerminalNode id = ctx.ID(); > if(id != null) { > System.out.println("expresion: " + id.getText()); > vars.add(id.getText()); > } > return super.visitQuantity(ctx); > } > > -at-Override > public Void visitVariables(CalcParser.VariablesContext ctx) { > TerminalNode id = ctx.ID(); > if(id != null) { > System.out.println("expresion: " + id.getText()); > vars.add(id.getText()); > } > return super.visitVariables(ctx); > } > } > > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > > [ruben-at-manjaro calculator]$ javac Main.java > ./CollectVarsVisitor.java:25: error: cannot find symbol > TerminalNode id = ctx.ID(); > ^ > symbol: method ID() > location: variable ctx of type PrintContext > ./CollectVarsVisitor.java:37: error: cannot find symbol > TerminalNode id = ctx.ID(); > ^ > symbol: method ID() > location: variable ctx of type NegativeContext > ./CollectVarsVisitor.java:48: error: cannot find symbol > TerminalNode id = ctx.ID(); > ^ > symbol: method ID() > location: variable ctx of type Products_quotentsContext > ./CollectVarsVisitor.java:58: error: cannot find symbol > TerminalNode id = ctx.ID(); > ^ > symbol: method ID() > location: variable ctx of type SumsContext > ./CollectVarsVisitor.java:68: error: cannot find symbol > TerminalNode id = ctx.ID(); > ^ > symbol: method ID() > location: variable ctx of type ParansContext > ./CollectVarsVisitor.java:78: error: cannot find symbol > TerminalNode id = ctx.ID(); > ^ > symbol: method ID() > location: variable ctx of type QuantityContext > Note: Some input files use or override a deprecated API. > Note: Recompile with -Xlint:deprecation for details. > 6 errors > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > cat Calc.g4 > grammar Calc; > > prog : (stmt ';')* > ; > > stmt : ID '=' expr #assignID > | 'print' expr #print > ; > > expr : '-' expr #negative > | expr ('*' | '/') expr #products_quotents > | expr ('+'|'-') expr #sums > | '(' expr ')' #parans > |NUM #quantity > |ID #variables > ; > > NUM : [0-9]+ ('.' [0-9]+)? > ; > ID :[a-zA-Z]+ > ; > WS :(' '|'\n'|'\t'|'\r')+ ->skip > ; > > So I'm only visiting visitAssignID and visitQuantity and visitVariables? > > Ruben > > -- > So many immigrant groups have swept through our town > that Brooklyn, like Atlantis, reaches mythological > proportions in the mind of the world - RI Safir 1998 > http://www.mrbrklyn.com > > DRM is THEFT - We are the STAKEHOLDERS - RI Safir 2002 > http://www.nylxs.com - Leadership Development in Free Software > http://www2.mrbrklyn.com/resources - Unpublished Archive > http://www.coinhangout.com - coins! > http://www.brooklyn-living.com > > Being so tracked is for FARM ANIMALS and and extermination camps, > but incompatible with living as a free human being. -RI Safir 2013 --=-=-= MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" So I'm only visiting visitAssignID and visitQuantity and visitVariables? Not even visitQuantity, I think. The purpose of CollectVarsVisitor was to "traverse a parse tree for the calculator language and just keep track of the set of identifiers that are being referenced (assigned or retrieved) in the program." If we look at the grammar: stmt : ID '=' expr #assignID | 'print' expr #print ; expr : '-' expr #negative | expr ('*' | '/') expr #products_quotents | expr ('+'|'-') expr #sums | '(' expr ')' #parans |NUM #quantity |ID #variables ; The only place that a variable is assigned is in #assignID and the only place a variable is retrieved is in #variables. So those are the only two visit methods we'd need to fulfill the purpose of CollectVarsVisitor. The AssignIDContext and VariablesContext will each have a ctx.ID() because ID appears in both of those rules. And because it appears exactly once in each, the method returns just a single TerminalNode, rather than a list of them. The other contexts (tree nodes) don't have any ID, so there is no ctx.ID() method in those. CL Ruben Safir [1]ruben-at-mrbrklyn.com writes: So kicking this around, forget that this HW is now a month old... I did this which fails, and I know why...I think Note that it fails on contex objects that have no ID() import org.antlr.v4.runtime.ANTLRInputStream; import org.antlr.v4.runtime.CommonTokenStream; import org.antlr.v4.runtime.tree.ParseTree; import org.antlr.v4.runtime.tree.TerminalNode; import org.antlr.v4.runtime.; import org.antlr.v4.runtime.tree.; import java.util.HashSet; public class CollectVarsVisitor extends CalcBaseVisitor { HashSet vars = new HashSet(); //STMT -at-Override public Void visitAssignID(CalcParser.AssignIDContext ctx) { TerminalNode id = ctx.ID(); if(id != null) { System.out.println(id.getText()); vars.add(id.getText()); } return super.visitAssignID(ctx); } -at-Override public Void visitPrint(CalcParser.PrintContext ctx) { TerminalNode id = ctx.ID(); if(id != null) { System.out.println(id.getText()); vars.add(id.getText()); } return super.visitPrint(ctx); } //EXPR -at-Override public Void visitNegative(CalcParser.NegativeContext ctx) { TerminalNode id = ctx.ID(); if(id != null) { System.out.println("expresion: " + id.getText()); vars.add(id.getText()); } return super.visitNegative(ctx); } -at-Override public Void visitProducts_quotents(CalcParser.Products_quotentsContext ctx) { TerminalNode id = ctx.ID(); if(id != null) { System.out.println("expresion: " + id.getText()); vars.add(id.getText()); } return super.visitProducts_quotents(ctx); } -at-Override public Void visitSums(CalcParser.SumsContext ctx) { TerminalNode id = ctx.ID(); if(id != null) { System.out.println("expresion: " + id.getText()); vars.add(id.getText()); } return super.visitSums(ctx); } -at-Override public Void visitParans(CalcParser.ParansContext ctx) { TerminalNode id = ctx.ID(); if(id != null) { System.out.println("expresion: " + id.getText()); vars.add(id.getText()); } return super.visitParans(ctx); } -at-Override public Void visitQuantity(CalcParser.QuantityContext ctx) { TerminalNode id = ctx.ID(); if(id != null) { System.out.println("expresion: " + id.getText()); vars.add(id.getText()); } return super.visitQuantity(ctx); } -at-Override public Void visitVariables(CalcParser.VariablesContext ctx) { TerminalNode id = ctx.ID(); if(id != null) { System.out.println("expresion: " + id.getText()); vars.add(id.getText()); } return super.visitVariables(ctx); } } [ruben-at-manjaro calculator]$ javac Main.java ./CollectVarsVisitor.java:25: error: cannot find symbol TerminalNode id = ctx.ID(); ^ symbol: method ID() location: variable ctx of type PrintContext ./CollectVarsVisitor.java:37: error: cannot find symbol TerminalNode id = ctx.ID(); ^ symbol: method ID() location: variable ctx of type NegativeContext ./CollectVarsVisitor.java:48: error: cannot find symbol TerminalNode id = ctx.ID(); ^ symbol: method ID() location: variable ctx of type Products_quotentsContext ./CollectVarsVisitor.java:58: error: cannot find symbol TerminalNode id = ctx.ID(); ^ symbol: method ID() location: variable ctx of type SumsContext ./CollectVarsVisitor.java:68: error: cannot find symbol TerminalNode id = ctx.ID(); ^ symbol: method ID() location: variable ctx of type ParansContext ./CollectVarsVisitor.java:78: error: cannot find symbol TerminalNode id = ctx.ID(); ^ symbol: method ID() location: variable ctx of type QuantityContext Note: Some input files use or override a deprecated API. Note: Recompile with -Xlint:deprecation for details. 6 errors cat Calc.g4 grammar Calc; prog : (stmt `;')* ; stmt : ID `=' expr #assignID | `print' expr #print ; expr : `-' expr #negative | expr ('*`|'/`) expr #products_quotents | expr ('+`|'-`) expr #sums |'(`expr')' #parans |NUM #quantity |ID #variables ; NUM : [0-9]+ ('.`[0-9]+)? ; ID :[a-zA-Z]+ ; WS :(' `|'`|'`|'')+ ->skip ; So I'm only visiting visitAssignID and visitQuantity and visitVariables? Ruben - So many immigrant groups have swept through our town that Brooklyn, like Atlantis, reaches mythological proportions in the mind of the world - RI Safir 1998 http://www.mrbrklyn.com DRM is THEFT - We are the STAKEHOLDERS - RI Safir 2002 http://www.nylxs.com - Leadership Development in Free Software http://www2.mrbrklyn.com/resources - Unpublished Archive http://www.coinhangout.com - coins! http://www.brooklyn-living.com Being so tracked is for FARM ANIMALS and and extermination camps, but incompatible with living as a free human being. -RI Safir 2013 References 1. mailto:ruben-at-mrbrklyn.com --=-=-=-- --===============0359403622== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ hangout mailing list hangout-at-nylxs.com http://www.nylxs.com/ --===============0359403622==-- --===============0359403622== Content-Type: multipart/alternative; boundary="=-=-=" --=-=-= Content-Type: text/plain > So I'm only visiting visitAssignID and visitQuantity and > visitVariables? Not even visitQuantity, I think. The purpose of `CollectVarsVisitor` was to "traverse a parse tree for the calculator language and just keep track of the set of identifiers that are being referenced (assigned or retrieved) in the program." If we look at the grammar: stmt : ID '=' expr #assignID | 'print' expr #print ; expr : '-' expr #negative | expr ('*' | '/') expr #products_quotents | expr ('+'|'-') expr #sums | '(' expr ')' #parans |NUM #quantity |ID #variables ; The only place that a variable is assigned is in `#assignID` and the only place a variable is retrieved is in `#variables`. So those are the only two visit methods we'd need to fulfill the purpose of `CollectVarsVisitor`. The `AssignIDContext` and `VariablesContext` will each have a `ctx.ID()` because ID appears in both of those rules. And because it appears exactly once in each, the method returns just a single `TerminalNode`, rather than a list of them. The other contexts (tree nodes) don't have any ID, so there is no `ctx.ID()` method in those. CL Ruben Safir writes: > So kicking this around, forget that this HW is now a month old... > > I did this which fails, and I know why...I think > > > Note that it fails on contex objects that have no ID() > > > import org.antlr.v4.runtime.ANTLRInputStream; > import org.antlr.v4.runtime.CommonTokenStream; > import org.antlr.v4.runtime.tree.ParseTree; > import org.antlr.v4.runtime.tree.TerminalNode; > import org.antlr.v4.runtime.*; > import org.antlr.v4.runtime.tree.*; > import java.util.HashSet; > > public class CollectVarsVisitor extends CalcBaseVisitor { > HashSet vars = new HashSet(); > > //STMT > -at-Override > public Void visitAssignID(CalcParser.AssignIDContext ctx) { > TerminalNode id = ctx.ID(); > if(id != null) { > System.out.println(id.getText()); > vars.add(id.getText()); > } > return super.visitAssignID(ctx); > } > > -at-Override > public Void visitPrint(CalcParser.PrintContext ctx) { > TerminalNode id = ctx.ID(); > if(id != null) { > System.out.println(id.getText()); > vars.add(id.getText()); > } > return super.visitPrint(ctx); > } > > //EXPR > > -at-Override > public Void visitNegative(CalcParser.NegativeContext ctx) { > TerminalNode id = ctx.ID(); > if(id != null) { > System.out.println("expresion: " + id.getText()); > vars.add(id.getText()); > } > return super.visitNegative(ctx); > } > > > -at-Override > public Void visitProducts_quotents(CalcParser.Products_quotentsContext ctx) { > TerminalNode id = ctx.ID(); > if(id != null) { > System.out.println("expresion: " + id.getText()); > vars.add(id.getText()); > } > return super.visitProducts_quotents(ctx); > } > > -at-Override > public Void visitSums(CalcParser.SumsContext ctx) { > TerminalNode id = ctx.ID(); > if(id != null) { > System.out.println("expresion: " + id.getText()); > vars.add(id.getText()); > } > return super.visitSums(ctx); > } > > -at-Override > public Void visitParans(CalcParser.ParansContext ctx) { > TerminalNode id = ctx.ID(); > if(id != null) { > System.out.println("expresion: " + id.getText()); > vars.add(id.getText()); > } > return super.visitParans(ctx); > } > > -at-Override > public Void visitQuantity(CalcParser.QuantityContext ctx) { > TerminalNode id = ctx.ID(); > if(id != null) { > System.out.println("expresion: " + id.getText()); > vars.add(id.getText()); > } > return super.visitQuantity(ctx); > } > > -at-Override > public Void visitVariables(CalcParser.VariablesContext ctx) { > TerminalNode id = ctx.ID(); > if(id != null) { > System.out.println("expresion: " + id.getText()); > vars.add(id.getText()); > } > return super.visitVariables(ctx); > } > } > > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > > [ruben-at-manjaro calculator]$ javac Main.java > ./CollectVarsVisitor.java:25: error: cannot find symbol > TerminalNode id = ctx.ID(); > ^ > symbol: method ID() > location: variable ctx of type PrintContext > ./CollectVarsVisitor.java:37: error: cannot find symbol > TerminalNode id = ctx.ID(); > ^ > symbol: method ID() > location: variable ctx of type NegativeContext > ./CollectVarsVisitor.java:48: error: cannot find symbol > TerminalNode id = ctx.ID(); > ^ > symbol: method ID() > location: variable ctx of type Products_quotentsContext > ./CollectVarsVisitor.java:58: error: cannot find symbol > TerminalNode id = ctx.ID(); > ^ > symbol: method ID() > location: variable ctx of type SumsContext > ./CollectVarsVisitor.java:68: error: cannot find symbol > TerminalNode id = ctx.ID(); > ^ > symbol: method ID() > location: variable ctx of type ParansContext > ./CollectVarsVisitor.java:78: error: cannot find symbol > TerminalNode id = ctx.ID(); > ^ > symbol: method ID() > location: variable ctx of type QuantityContext > Note: Some input files use or override a deprecated API. > Note: Recompile with -Xlint:deprecation for details. > 6 errors > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > cat Calc.g4 > grammar Calc; > > prog : (stmt ';')* > ; > > stmt : ID '=' expr #assignID > | 'print' expr #print > ; > > expr : '-' expr #negative > | expr ('*' | '/') expr #products_quotents > | expr ('+'|'-') expr #sums > | '(' expr ')' #parans > |NUM #quantity > |ID #variables > ; > > NUM : [0-9]+ ('.' [0-9]+)? > ; > ID :[a-zA-Z]+ > ; > WS :(' '|'\n'|'\t'|'\r')+ ->skip > ; > > So I'm only visiting visitAssignID and visitQuantity and visitVariables? > > Ruben > > -- > So many immigrant groups have swept through our town > that Brooklyn, like Atlantis, reaches mythological > proportions in the mind of the world - RI Safir 1998 > http://www.mrbrklyn.com > > DRM is THEFT - We are the STAKEHOLDERS - RI Safir 2002 > http://www.nylxs.com - Leadership Development in Free Software > http://www2.mrbrklyn.com/resources - Unpublished Archive > http://www.coinhangout.com - coins! > http://www.brooklyn-living.com > > Being so tracked is for FARM ANIMALS and and extermination camps, > but incompatible with living as a free human being. -RI Safir 2013 --=-=-= MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" So I'm only visiting visitAssignID and visitQuantity and visitVariables? Not even visitQuantity, I think. The purpose of CollectVarsVisitor was to "traverse a parse tree for the calculator language and just keep track of the set of identifiers that are being referenced (assigned or retrieved) in the program." If we look at the grammar: stmt : ID '=' expr #assignID | 'print' expr #print ; expr : '-' expr #negative | expr ('*' | '/') expr #products_quotents | expr ('+'|'-') expr #sums | '(' expr ')' #parans |NUM #quantity |ID #variables ; The only place that a variable is assigned is in #assignID and the only place a variable is retrieved is in #variables. So those are the only two visit methods we'd need to fulfill the purpose of CollectVarsVisitor. The AssignIDContext and VariablesContext will each have a ctx.ID() because ID appears in both of those rules. And because it appears exactly once in each, the method returns just a single TerminalNode, rather than a list of them. The other contexts (tree nodes) don't have any ID, so there is no ctx.ID() method in those. CL Ruben Safir [1]ruben-at-mrbrklyn.com writes: So kicking this around, forget that this HW is now a month old... I did this which fails, and I know why...I think Note that it fails on contex objects that have no ID() import org.antlr.v4.runtime.ANTLRInputStream; import org.antlr.v4.runtime.CommonTokenStream; import org.antlr.v4.runtime.tree.ParseTree; import org.antlr.v4.runtime.tree.TerminalNode; import org.antlr.v4.runtime.; import org.antlr.v4.runtime.tree.; import java.util.HashSet; public class CollectVarsVisitor extends CalcBaseVisitor { HashSet vars = new HashSet(); //STMT -at-Override public Void visitAssignID(CalcParser.AssignIDContext ctx) { TerminalNode id = ctx.ID(); if(id != null) { System.out.println(id.getText()); vars.add(id.getText()); } return super.visitAssignID(ctx); } -at-Override public Void visitPrint(CalcParser.PrintContext ctx) { TerminalNode id = ctx.ID(); if(id != null) { System.out.println(id.getText()); vars.add(id.getText()); } return super.visitPrint(ctx); } //EXPR -at-Override public Void visitNegative(CalcParser.NegativeContext ctx) { TerminalNode id = ctx.ID(); if(id != null) { System.out.println("expresion: " + id.getText()); vars.add(id.getText()); } return super.visitNegative(ctx); } -at-Override public Void visitProducts_quotents(CalcParser.Products_quotentsContext ctx) { TerminalNode id = ctx.ID(); if(id != null) { System.out.println("expresion: " + id.getText()); vars.add(id.getText()); } return super.visitProducts_quotents(ctx); } -at-Override public Void visitSums(CalcParser.SumsContext ctx) { TerminalNode id = ctx.ID(); if(id != null) { System.out.println("expresion: " + id.getText()); vars.add(id.getText()); } return super.visitSums(ctx); } -at-Override public Void visitParans(CalcParser.ParansContext ctx) { TerminalNode id = ctx.ID(); if(id != null) { System.out.println("expresion: " + id.getText()); vars.add(id.getText()); } return super.visitParans(ctx); } -at-Override public Void visitQuantity(CalcParser.QuantityContext ctx) { TerminalNode id = ctx.ID(); if(id != null) { System.out.println("expresion: " + id.getText()); vars.add(id.getText()); } return super.visitQuantity(ctx); } -at-Override public Void visitVariables(CalcParser.VariablesContext ctx) { TerminalNode id = ctx.ID(); if(id != null) { System.out.println("expresion: " + id.getText()); vars.add(id.getText()); } return super.visitVariables(ctx); } } [ruben-at-manjaro calculator]$ javac Main.java ./CollectVarsVisitor.java:25: error: cannot find symbol TerminalNode id = ctx.ID(); ^ symbol: method ID() location: variable ctx of type PrintContext ./CollectVarsVisitor.java:37: error: cannot find symbol TerminalNode id = ctx.ID(); ^ symbol: method ID() location: variable ctx of type NegativeContext ./CollectVarsVisitor.java:48: error: cannot find symbol TerminalNode id = ctx.ID(); ^ symbol: method ID() location: variable ctx of type Products_quotentsContext ./CollectVarsVisitor.java:58: error: cannot find symbol TerminalNode id = ctx.ID(); ^ symbol: method ID() location: variable ctx of type SumsContext ./CollectVarsVisitor.java:68: error: cannot find symbol TerminalNode id = ctx.ID(); ^ symbol: method ID() location: variable ctx of type ParansContext ./CollectVarsVisitor.java:78: error: cannot find symbol TerminalNode id = ctx.ID(); ^ symbol: method ID() location: variable ctx of type QuantityContext Note: Some input files use or override a deprecated API. Note: Recompile with -Xlint:deprecation for details. 6 errors cat Calc.g4 grammar Calc; prog : (stmt `;')* ; stmt : ID `=' expr #assignID | `print' expr #print ; expr : `-' expr #negative | expr ('*`|'/`) expr #products_quotents | expr ('+`|'-`) expr #sums |'(`expr')' #parans |NUM #quantity |ID #variables ; NUM : [0-9]+ ('.`[0-9]+)? ; ID :[a-zA-Z]+ ; WS :(' `|'`|'`|'')+ ->skip ; So I'm only visiting visitAssignID and visitQuantity and visitVariables? Ruben - So many immigrant groups have swept through our town that Brooklyn, like Atlantis, reaches mythological proportions in the mind of the world - RI Safir 1998 http://www.mrbrklyn.com DRM is THEFT - We are the STAKEHOLDERS - RI Safir 2002 http://www.nylxs.com - Leadership Development in Free Software http://www2.mrbrklyn.com/resources - Unpublished Archive http://www.coinhangout.com - coins! http://www.brooklyn-living.com Being so tracked is for FARM ANIMALS and and extermination camps, but incompatible with living as a free human being. -RI Safir 2013 References 1. mailto:ruben-at-mrbrklyn.com --=-=-=-- --===============0359403622== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ hangout mailing list hangout-at-nylxs.com http://www.nylxs.com/ --===============0359403622==-- 2016-04-05 ISOC-NY announcements <announce-at-lists.isoc-ny.org> Subject: [Hangout-NYLXS] [isoc-ny] ISOC-NY President Resigns 2016-04-06 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Hangout-NYLXS] Returned from the Crussades 2016-04-06 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Hangout-NYLXS] pics 2016-04-06 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Hangout-NYLXS] For Rickie!!! 2016-04-06 Rick Moen <rick-at-linuxmafia.com> Re: [Hangout-NYLXS] For Rickie!!! 2016-04-06 Rick Moen <rick-at-linuxmafia.com> Re: [Hangout-NYLXS] Returned from the Crussades 2016-04-06 James E Keenan <jkeen-at-verizon.net> Subject: [Hangout-NYLXS] Perl 6 Group Update 2016-04-07 eminker-at-gmail.com Re: [Hangout-NYLXS] Returned from the Crussades 2016-04-07 From: "David H. Adler" <dha-at-panix.com> Re: [Hangout-NYLXS] Perl 6 Group Update 2016-04-08 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Hangout-NYLXS] Fanless Desktop Solutions 2016-04-08 Rick Moen <rick-at-linuxmafia.com> Re: [Hangout-NYLXS] Fanless Desktop Solutions 2016-04-08 Ruben Safir <ruben.safir-at-my.liu.edu> Re: [Hangout-NYLXS] Fanless Desktop Solutions 2016-04-08 einker <eminker-at-gmail.com> Re: [Hangout-NYLXS] Fanless Desktop Solutions 2016-04-08 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Hangout-NYLXS] technight Announcement for Sunday 2016-04-08 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Hangout-NYLXS] technight Announcement for Sunday 2016-04-08 Asia Suarez <as9795-at-nyu.edu> Re: [Hangout-NYLXS] technight Announcement for Sunday 2016-04-08 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Hangout-NYLXS] Fanless Desktop Solutions 2016-04-08 Rick Moen <rick-at-linuxmafia.com> Re: [Hangout-NYLXS] Fanless Desktop Solutions 2016-04-08 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Hangout-NYLXS] Fwd: Linux Journal Weekly News - April 8, 2015 2016-04-08 Ruben Safir <ruben.safir-at-my.liu.edu> Re: [Hangout-NYLXS] Fanless Desktop Solutions 2016-04-08 Rick Moen <rick-at-linuxmafia.com> Re: [Hangout-NYLXS] Fanless Desktop Solutions 2016-04-08 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Hangout-NYLXS] visitor programming 2016-04-08 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Hangout-NYLXS] Fwd: Re: visitor programming 2016-04-08 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Hangout-NYLXS] visitor programming 2016-04-08 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Hangout-NYLXS] visitor programming 2016-04-08 Ruben Safir <ruben.safir-at-my.liu.edu> Re: [Hangout-NYLXS] visitor programming 2016-04-08 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Hangout-NYLXS] Antlr visitor Programming - kicking it around 2016-04-08 Ruben Safir <ruben.safir-at-my.liu.edu> Subject: [Hangout-NYLXS] visitor programming 2016-04-08 Ruben Safir <ruben.safir-at-my.liu.edu> Subject: [Hangout-NYLXS] visitor programming in Antlr 2016-04-09 Christopher League <christopher.league-at-liu.edu> Re: [Hangout-NYLXS] Antlr visitor Programming - kicking it around 2016-04-09 ISOC-NY announcements <announce-at-lists.isoc-ny.org> Subject: [Hangout-NYLXS] =?utf-8?q?=5Bisoc-ny=5D_SAT/SUN_=E2=80=93_ISOC_Bo?= 2016-04-09 Ruben Safir <mrbrklyn-at-panix.com> Re: [Hangout-NYLXS] Antlr visitor Programming - kicking it around 2016-04-10 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Hangout-NYLXS] Through my ole pal Billy - Milliniums are mulch 2016-04-10 Ruben Safir <mrbrklyn-at-panix.com> Subject: [Hangout-NYLXS] Movie of the Week 2016-04-10 Asia Suarez <as9795-at-nyu.edu> Re: [Hangout-NYLXS] technight Announcement for Sunday 2016-04-10 Ruben Safir <ruben.safir-at-my.liu.edu> Re: [Hangout-NYLXS] technight Announcement for Sunday 2016-04-11 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Hangout-NYLXS] Kernel Workshop announcement 2016-04-11 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Hangout-NYLXS] NYLXS Announcement Kernel Study Group 2016-04-11 Asia Suarez <as9795-at-nyu.edu> Re: [Hangout-NYLXS] NYLXS Announcement Kernel Study Group 2016-04-11 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Hangout-NYLXS] NYLXS Announcement Kernel Study Group 2016-04-11 Asia Suarez <as9795-at-nyu.edu> Re: [Hangout-NYLXS] NYLXS Announcement Kernel Study Group 2016-04-11 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Hangout-NYLXS] NYLXS Announcement Kernel Study Group 2016-04-11 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Hangout-NYLXS] Rocky Racoon 2016-04-11 einker <eminker-at-gmail.com> Re: [Hangout-NYLXS] Rocky Racoon 2016-04-11 Rick Moen <rick-at-linuxmafia.com> Re: [Hangout-NYLXS] Rocky Racoon 2016-04-11 Rick Moen <rick-at-linuxmafia.com> Re: [Hangout-NYLXS] NYLXS Announcement Kernel Study Group 2016-04-11 Ruben Safir <mrbrklyn-at-panix.com> Re: [Hangout-NYLXS] NYLXS Announcement Kernel Study Group 2016-04-11 Rick Moen <rick-at-linuxmafia.com> Re: [Hangout-NYLXS] Kernel Workshop announcement 2016-04-11 Ruben Safir <mrbrklyn-at-panix.com> Re: [Hangout-NYLXS] NYLXS Announcement Kernel Study Group 2016-04-11 Ruben Safir <ruben.safir-at-my.liu.edu> Re: [Hangout-NYLXS] Kernel Workshop announcement 2016-04-11 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Hangout-NYLXS] networking and fragments 2016-04-11 Ruben Safir <mrbrklyn-at-panix.com> Subject: [Hangout-NYLXS] Fwd: [nylug-talk] RSVP open: Wed Apr 20, 2016-04-11 From: "Jose A. Rodriguez" <Jose.Rodriguez-at-liu.edu> Re: [Hangout-NYLXS] networking and fragments 2016-04-10 James E Keenan <jkeen-at-verizon.net> Subject: [Hangout-NYLXS] 2 events this week 2016-04-11 prmarino1-at-gmail.com Re: [Hangout-NYLXS] networking and fragments 2016-04-11 Ruben Safir <mrbrklyn-at-panix.com> Re: [Hangout-NYLXS] Winners of the LIU Hackathon 2016-04-11 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Hangout-NYLXS] networking and fragments 2016-04-12 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Hangout-NYLXS] the EASY and PAINLESS guil to CRC checksums 2016-04-13 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Hangout-NYLXS] compiling java 2016-04-13 Rick Moen <rick-at-linuxmafia.com> Re: [Hangout-NYLXS] the EASY and PAINLESS guil to CRC checksums 2016-04-13 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Hangout-NYLXS] confused as to arp tables 2016-04-13 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Hangout-NYLXS] confused as to arp tables 2016-04-13 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Hangout-NYLXS] confused as to arp tables 2016-04-13 Rick Moen <rick-at-linuxmafia.com> Re: [Hangout-NYLXS] confused as to arp tables 2016-04-13 prmarino1-at-gmail.com Re: [Hangout-NYLXS] confused as to arp tables 2016-04-13 From: "Deutsch, Chaim" <CDeutsch-at-council.nyc.gov> Subject: [Hangout-NYLXS] THE DEUTSCH REPORT: News From Councilman Chaim 2016-04-13 prmarino1-at-gmail.com Re: [Hangout-NYLXS] confused as to arp tables 2016-04-14 William Parker <saurian55-at-gmail.com> Subject: [Hangout-NYLXS] [dinosaur] New Seasonal Paleontology Position with 2016-04-14 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Hangout-NYLXS] Networking Tools 2016-04-14 Rick Moen <rick-at-linuxmafia.com> Re: [Hangout-NYLXS] Networking Tools 2016-04-14 Ruben Safir <mrbrklyn-at-panix.com> Re: [Hangout-NYLXS] Networking Tools 2016-04-17 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Hangout-NYLXS] meetings 2016-04-18 Ruben Safir <mrbrklyn-at-panix.com> Subject: [Hangout-NYLXS] taking a few days off 2016-04-18 ruben <ruben-at-mrbrklyn.com> Subject: [Hangout-NYLXS] google booked copyright 2016-04-18 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Hangout-NYLXS] Fwd: THE DEUTSCH REPORT: News From Councilman Chaim 2016-04-19 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Hangout-NYLXS] Passover is here 2016-04-21 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Hangout-NYLXS] turn off your god damn phone 2016-04-21 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Hangout-NYLXS] Java is just retarted 2016-04-21 Ruben Safir <mrbrklyn-at-panix.com> Subject: [Hangout-NYLXS] Khol Meod 2016-04-21 Rick Moen <rick-at-linuxmafia.com> Re: [Hangout-NYLXS] Java is just retarted 2016-04-21 Ruben Safir <mrbrklyn-at-panix.com> Re: [Hangout-NYLXS] Java is just retarted 2016-04-22 Ruben Safir <ruben.safir-at-my.liu.edu> Re: [Hangout-NYLXS] Denim Day - Wear Jeans with a Purpose, April 27 2016-04-23 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Hangout-NYLXS] must have tech 2016-04-24 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Hangout-NYLXS] you have to love this story 2016-04-24 prmarino1-at-gmail.com Re: [Hangout-NYLXS] must have tech 2016-04-24 prmarino1-at-gmail.com Re: [Hangout-NYLXS] must have tech 2016-04-25 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Hangout-NYLXS] [kamran.mirzayev-at-my.liu.edu: Re: Programming 2016-04-25 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Hangout-NYLXS] + behavior in the shell 2016-04-26 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Hangout-NYLXS] error: unclosed character literal 2016-04-26 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Hangout-NYLXS] error: unclosed character literal 2016-04-26 Rshana Shurriah <rshanashurriah-at-gmail.com> Re: [Hangout-NYLXS] error: unclosed character literal 2016-04-26 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Hangout-NYLXS] error: unclosed character literal 2016-04-26 Christopher League <christopher.league-at-liu.edu> Re: [Hangout-NYLXS] fwiw with errors 2016-04-26 Christopher League <christopher.league-at-liu.edu> Re: [Hangout-NYLXS] Good Morning Sunshine 2016-04-26 Christopher League <christopher.league-at-liu.edu> Re: [Hangout-NYLXS] heart burn 2016-04-26 Christopher League <christopher.league-at-liu.edu> Re: [Hangout-NYLXS] error: unclosed character literal 2016-04-27 IEEE CS Webinars <csconnection-at-computer.org> Subject: [Hangout-NYLXS] Don't forget to register: Is Your DevOps Team 2016-04-27 Paul Li <paul.li.nyc-at-hotmail.com> Re: [Hangout-NYLXS] hangout Digest, Vol 7, Issue 27 2016-04-27 Ruben Safir <mrbrklyn-at-panix.com> Re: [Hangout-NYLXS] hangout Digest, Vol 7, Issue 27 2016-04-27 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Hangout-NYLXS] Communications Bill 2016-04-28 Rick Moen <rick-at-linuxmafia.com> Re: [Hangout-NYLXS] Communications Bill 2016-04-28 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Hangout-NYLXS] AI Conference 2016-04-28 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Hangout-NYLXS] What is a U (other than a letter in the alphabet) 2016-04-28 Ruben Safir <mrbrklyn-at-panix.com> Re: [Hangout-NYLXS] Communications Bill 2016-04-28 Rick Moen <rick-at-linuxmafia.com> Re: [Hangout-NYLXS] What is a U (other than a letter in the 2016-04-28 Ruben Safir <mrbrklyn-at-panix.com> Re: [Hangout-NYLXS] What is a U (other than a letter in the 2016-04-28 Ruben Safir <mrbrklyn-at-panix.com> Subject: [Hangout-NYLXS] Fwd: Tell us about your recent Optimum experience. 2016-04-28 Ruben Safir <mrbrklyn-at-panix.com> Re: [Hangout-NYLXS] Tell us about your recent Optimum experience. 2016-04-27 James E Keenan <jkeen-at-verizon.net> Subject: [Hangout-NYLXS] NYC Perl 6 Beginners Study Group: Session 4: Sat 2016-04-28 Christopher League <christopher.league-at-liu.edu> Subject: [Hangout-NYLXS] how to build/run assn7/8 from cmdline 2016-04-28 prmarino1-at-gmail.com Re: [Hangout-NYLXS] NYC Perl 6 Beginners Study Group: Session 4: 2016-04-28 prmarino1-at-gmail.com Re: [Hangout-NYLXS] Communications Bill 2016-04-29 Rick Moen <rick-at-linuxmafia.com> Re: [Hangout-NYLXS] What is a U (other than a letter in the NYLXS are Do'ers and the first step of Doing is Joining! 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