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Fix indirect left recursive rule operator precedence via delegated operator precedence #4480

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Fix indirect left recursive rule operator precedence via delegated operator precedence #4480

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3eef0d3
support indirect left recursive rules via delegated operator precedence
luepges Nov 30, 2023
e3ca726
fix oversights of support indirect left recursive rules via delegated…
luepges Nov 30, 2023
fe4d260
enable more tests & fix PHP & Dart target - potentially
luepges Nov 30, 2023
c3958e6
Increase CharPositionInLine by (= dp 1)
luepges Nov 30, 2023
b085759
fix Dart optional param
luepges Nov 30, 2023
3dcb01f
add proxy del-prec-method to PHP
luepges Nov 30, 2023
b5d84f6
Dart: Use unnamed optional parameter instead
MisterErwin Nov 30, 2023
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41 changes: 41 additions & 0 deletions ...s/org/antlr/v4/test/runtime/descriptors/LeftRecursion/IndirectExpressionsWithAttr_int.txt
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@@ -0,0 +1,41 @@
[type]
Parser

[grammar]
grammar T;
s @after {<ToStringTree("$ctx"):writeln()>} : e EOF ; // must indicate EOF can follow
e : e '.' ID
| b[0]
| m[0]
| e '*' e
| e ('+'|'-') e
| INT
| ID
;
b [int x]: '(' e ')';
m [int y] : '-' e;
ID : 'a'..'z'+ ;
INT : '0'..'9'+ ;
WS : (' '|'\n') -> skip ;

[start]
s

[input]
-(-a+b)+c

[output]
"""(s (e (e (m - (e (b ( (e (e (m - (e a))) + (e b)) ))))) + (e c)) <EOF>)
"""

[skip]
##Cpp
##CSharp
##Dart
##Go
##Java
##JavaScript
##PHP
##Python3
##Swift
TypeScript
41 changes: 41 additions & 0 deletions ...rg/antlr/v4/test/runtime/descriptors/LeftRecursion/IndirectExpressionsWithAttr_number.txt
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@@ -0,0 +1,41 @@
[type]
Parser

[grammar]
grammar T;
s @after {<ToStringTree("$ctx"):writeln()>} : e EOF ; // must indicate EOF can follow
e : e '.' ID
| b[0]
| m[0]
| e '*' e
| e ('+'|'-') e
| INT
| ID
;
b [number x]: '(' e ')';
m [number y] : '-' e;
ID : 'a'..'z'+ ;
INT : '0'..'9'+ ;
WS : (' '|'\n') -> skip ;

[start]
s

[input]
-(-a+b)+c

[output]
"""(s (e (e (m - (e (b ( (e (e (m - (e a))) + (e b)) ))))) + (e c)) <EOF>)
"""

[skip]
Cpp
CSharp
Dart
Go
Java
JavaScript
PHP
Python3
Swift
##TypeScript
30 changes: 30 additions & 0 deletions ...e/resources/org/antlr/v4/test/runtime/descriptors/LeftRecursion/IndirectExpressions_1.txt
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@@ -0,0 +1,30 @@
[type]
Parser

[grammar]
grammar T;
s @after {<ToStringTree("$ctx"):writeln()>} : e EOF ; // must indicate EOF can follow
e : e '.' ID
| b
| m
| e '*' e
| e ('+'|'-') e
| INT
| ID
;
b : '(' e ')';
m : '-' e;
ID : 'a'..'z'+ ;
INT : '0'..'9'+ ;
WS : (' '|'\n') -> skip ;

[start]
s

[input]
-(-a+b)+c

[output]
"""(s (e (e (m - (e (b ( (e (e (m - (e a))) + (e b)) ))))) + (e c)) <EOF>)
"""

32 changes: 32 additions & 0 deletions ...e/resources/org/antlr/v4/test/runtime/descriptors/LeftRecursion/IndirectExpressions_2.txt
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@@ -0,0 +1,32 @@
[type]
Parser

[grammar]
grammar T;
s @after {<ToStringTree("$ctx"):writeln()>} : e EOF ; // must indicate EOF can follow
e : e '.' ID
| b1
| m1
| e '*' e
| e ('+'|'-') e
| INT
| ID
;
b1 : b;
b : '(' e ')';
m1 : m;
m : '-' e;
ID : 'a'..'z'+ ;
INT : '0'..'9'+ ;
WS : (' '|'\n') -> skip ;

[start]
s

[input]
-(-a+b)+c

[output]
"""(s (e (e (m1 (m - (e (b1 (b ( (e (e (m1 (m - (e a)))) + (e b)) ))))))) + (e c)) <EOF>)
"""

24 changes: 24 additions & 0 deletions ...e/resources/org/antlr/v4/test/runtime/descriptors/LeftRecursion/IndirectExpressions_3.txt
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@@ -0,0 +1,24 @@
[type]
Parser

[grammar]
grammar T;
s @after {<ToStringTree("$ctx"):writeln()>} : e EOF ; // must indicate EOF can follow
e : namee | bracke | minusprefixe | e '+' e ;
namee : ID;
bracke : '(' e ')';
minusprefixe: ('-' tmp0=e) | 'unrelatedThing';
ID : 'a'..'z'+ ;
INT : '0'..'9'+ ;
WS : (' '|'\n') -> skip ;

[start]
s

[input]
-a+b

[output]
"""(s (e (e (minusprefixe - (e (namee a)))) + (e (namee b))) <EOF>)
"""

2 changes: 1 addition & 1 deletion tool-testsuite/test/org/antlr/v4/test/tool/TestSymbolIssues.java
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Expand Up @@ -550,7 +550,7 @@ public void testLabelsForTokensWithMixedTypesLRWithoutLabels() {
"a: 'a';\n" +
"b: 'b';",

"error(" + ErrorType.INTERNAL_ERROR.code + "): Test.g4:2:30: internal error: Rule error undefined \n"
"error(" + ErrorType.INTERNAL_ERROR.code + "): Test.g4:2:35: internal error: Rule error undefined \n"
};

testErrors(test, false);
Expand Down
4 changes: 2 additions & 2 deletions tool/resources/org/antlr/v4/tool/templates/codegen/CSharp/CSharp.stg
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Expand Up @@ -404,7 +404,7 @@ RuleFunction(currentRule,args,code,locals,ruleCtx,altLabelCtxs,namedActions,fina
<altLabelCtxs:{l | <altLabelCtxs.(l)>}; separator="\n">

[RuleVersion(<namedActions.version; null="0">)]
<if(currentRule.modifiers)><currentRule.modifiers:{f | <f> }><else>public <endif><currentRule.ctxType> <currentRule.escapedName>(<args; separator=", ">) {
<if(currentRule.modifiers)><currentRule.modifiers:{f | <f> }><else>public <endif><currentRule.ctxType> <currentRule.escapedName>(<[args, currentRule.hasDelegatedPrecedence:{_|int _dp=0}]; separator=", ">) {
<currentRule.ctxType> _localctx = new <currentRule.ctxType>(Context, State<currentRule.args:{a | , <a.escapedName>}>);
EnterRule(_localctx, <currentRule.startState>, RULE_<currentRule.name>);
<namedActions.init>
Expand Down Expand Up @@ -708,7 +708,7 @@ cases(tokens) ::= <<

InvokeRule(r, argExprsChunks) ::= <<
State = <r.stateNumber>;
<if(r.labels)><r.labels:{l | <labelref(l)> = }><endif><r.escapedName>(<if(r.ast.options.p)><r.ast.options.p><if(argExprsChunks)>,<endif><endif><argExprsChunks>);
<if(r.labels)><r.labels:{l | <labelref(l)> = }><endif><r.escapedName>(<[r.ast.options.p, argExprsChunks, r.ast.options.dp]; separator=",">);
>>

MatchToken(m) ::= <<
Expand Down
6 changes: 3 additions & 3 deletions tool/resources/org/antlr/v4/tool/templates/codegen/Cpp/Cpp.stg
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Expand Up @@ -487,14 +487,14 @@ for (size_t i = 0; i \< count; i++) { <! Rework class ATN to allow standard iter
RuleFunctionHeader(currentRule, args, code, locals, ruleCtx, altLabelCtxs, namedActions, finallyAction, postamble, exceptions) ::= <<
<ruleCtx>
<! TODO: untested !><if (altLabelCtxs)><altLabelCtxs: {l | <altLabelCtxs.(l)>}; separator="\n"><endif>
<currentRule.ctxType>* <currentRule.escapedName>(<args; separator=",">);
<currentRule.ctxType>* <currentRule.escapedName>(<[args, currentRule.hasDelegatedPrecedence:{_|int _dp=0}]; separator=",">);

>>

RuleFunction(currentRule, args, code, locals, ruleCtx, altLabelCtxs, namedActions, finallyAction, postamble, exceptions) ::= <<
<ruleCtx>
<! TODO: untested !><altLabelCtxs: {l | <altLabelCtxs.(l)>}; separator = "\n">
<parser.name>::<currentRule.ctxType>* <parser.name>::<currentRule.escapedName>(<args; separator=",">) {
<parser.name>::<currentRule.ctxType>* <parser.name>::<currentRule.escapedName>(<[args, currentRule.hasDelegatedPrecedence:{_|int _dp}]; separator=",">) {
<currentRule.ctxType> *_localctx = _tracker.createInstance\<<currentRule.ctxType>\>(_ctx, getState()<currentRule.args:{a | , <a.escapedName>}>);
enterRule(_localctx, <currentRule.startState>, <parser.name>::Rule<currentRule.name; format = "cap">);
<namedActions.init>
Expand Down Expand Up @@ -852,7 +852,7 @@ cases(tokens) ::= <<
InvokeRuleHeader(r, argExprsChunks) ::= "InvokeRuleHeader"
InvokeRule(r, argExprsChunks) ::= <<
setState(<r.stateNumber>);
<if(r.labels)><r.labels: {l | <labelref(l)> = }><endif><r.escapedName>(<if(r.ast.options.p)><r.ast.options.p><if(argExprsChunks)>,<endif><endif><argExprsChunks>);
<if(r.labels)><r.labels: {l | <labelref(l)> = }><endif><r.escapedName>(<[r.ast.options.p, argExprsChunks, r.ast.options.dp]; separator=",">);
>>

MatchTokenHeader(m) ::= "<! Required but unused. !>"
Expand Down
4 changes: 2 additions & 2 deletions tool/resources/org/antlr/v4/tool/templates/codegen/Dart/Dart.stg
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Expand Up @@ -317,7 +317,7 @@ bool _<r.name>_sempred(dynamic _localctx, int predIndex) {

RuleFunction(currentRule,args,code,locals,ruleCtx,altLabelCtxs,namedActions,finallyAction,postamble,exceptions) ::= <<

<if(currentRule.modifiers)><currentRule.modifiers:{f | <f> }><else><endif><currentRule.ctxType> <currentRule.escapedName>(<args; separator=", ">) {
<if(currentRule.modifiers)><currentRule.modifiers:{f | <f> }><else><endif><currentRule.ctxType> <currentRule.escapedName>(<[args, currentRule.hasDelegatedPrecedence:{_|[int dp=0]}]; separator=", ">) {
dynamic _localctx = <currentRule.ctxType>(context, state<currentRule.args:{a | , <a.escapedName>}>);
enterRule(_localctx, <currentRule.startState>, RULE_<currentRule.name>);
<namedActions.init>
Expand Down Expand Up @@ -541,7 +541,7 @@ cases(tokens) ::= <<

InvokeRule(r, argExprsChunks) ::=<<
state = <r.stateNumber>;
<if(r.labels)><r.labels:{l | <labelref(l)> = }><endif><r.escapedName>(<if(r.ast.options.p)><r.ast.options.p><if(argExprsChunks)>,<endif><endif><argExprsChunks>);
<if(r.labels)><r.labels:{l | <labelref(l)> = }><endif><r.escapedName>(<[{<if(r.ast.options.pv)>dp<else><r.ast.options.p><endif>}, argExprsChunks, r.ast.options.dp]; separator=",">);
>>

MatchToken(m) ::= <<
Expand Down
11 changes: 11 additions & 0 deletions tool/resources/org/antlr/v4/tool/templates/codegen/Go/Go.stg
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Expand Up @@ -391,7 +391,14 @@ RuleFunction(currentRule, args, code, locals, ruleCtx, altLabelCtxs, namedAction


<endif>
<if(currentRule.hasDelegatedPrecedence)>
func (p *<parser.name>) <currentRule.escapedName; format="cap">(<currentRule.args:{a | <a.escapedName> <a.type>}; separator=", ">) (localctx I<currentRule.ctxType>) {
return p.<currentRule.escapedName>(0<currentRule.args:{a | , <a.escapedName>}>)
}
func (p *<parser.name>) <currentRule.escapedName>(_dp int<currentRule.args:{a | , <a.escapedName> <a.type>}>) (localctx I<currentRule.ctxType>) {
<else>
func (p *<parser.name>) <currentRule.escapedName; format="cap">(<currentRule.args:{a | <a.escapedName> <a.type>}; separator=", ">) (localctx I<currentRule.ctxType>) {
<endif>
localctx = New<currentRule.ctxType>(p, p.GetParserRuleContext(), p.GetState()<currentRule.args:{a | , <a.escapedName>}>)
p.EnterRule(localctx, <currentRule.startState>, <parser.name>RULE_<currentRule.name>)
<if(namedActions.init)>
Expand Down Expand Up @@ -796,6 +803,8 @@ InvokeRule(r, argExprsChunks) ::= <<

<if(r.ast.options.p)>
var _x = p.<r.escapedName>(<r.ast.options.p><if(argExprsChunks)>, <endif><argExprsChunks>)
<elseif(r.ast.options.dp)>
var _x = p.<r.escapedName>(<r.ast.options.dp><if(argExprsChunks)>, <endif><argExprsChunks>)
<else>
var _x = p.<r.escapedName; format="cap">(<argExprsChunks>)
<endif>
Expand All @@ -805,6 +814,8 @@ InvokeRule(r, argExprsChunks) ::= <<
<else>
<if(r.ast.options.p)>
p.<r.escapedName>(<r.ast.options.p><if(argExprsChunks)>, <endif><argExprsChunks>)
<elseif(r.ast.options.dp)>
p.<r.escapedName>(<r.ast.options.dp><if(argExprsChunks)>, <endif><argExprsChunks>)
<else>
p.<r.escapedName; format="cap">(<argExprsChunks>)
<endif>
Expand Down
8 changes: 6 additions & 2 deletions tool/resources/org/antlr/v4/tool/templates/codegen/Java/Java.stg
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Expand Up @@ -394,8 +394,12 @@ RuleFunction(currentRule,args,code,locals,ruleCtx,altLabelCtxs,namedActions,fina

<ruleCtx>
<altLabelCtxs:{l | <altLabelCtxs.(l)>}; separator="\n">

<if(currentRule.modifiers)><currentRule.modifiers:{f | <f> }><else>public final <endif><currentRule.ctxType> <currentRule.escapedName>(<args; separator=",">) throws RecognitionException {
<if(currentRule.hasDelegatedPrecedence)>
return <currentRule.escapedName>(<currentRule.args:{a | <a.escapedName>, }> 0);
}
<if(currentRule.modifiers)><currentRule.modifiers:{f | <f> }><else>public final <endif><currentRule.ctxType> <currentRule.escapedName>(<args:{a | <a>, }> int _dp ) throws RecognitionException {
<endif>
<currentRule.ctxType> _localctx = new <currentRule.ctxType>(_ctx, getState()<currentRule.args:{a | , <a.escapedName>}>);
enterRule(_localctx, <currentRule.startState>, RULE_<currentRule.name>);
<namedActions.init>
Expand Down Expand Up @@ -636,7 +640,7 @@ cases(tokens) ::= <<

InvokeRule(r, argExprsChunks) ::= <<
setState(<r.stateNumber>);
<if(r.labels)><r.labels:{l | <labelref(l)> = }><endif><r.escapedName>(<if(r.ast.options.p)><r.ast.options.p><if(argExprsChunks)>,<endif><endif><argExprsChunks>);
<if(r.labels)><r.labels:{l | <labelref(l)> = }><endif><r.escapedName>(<[r.ast.options.p, argExprsChunks, r.ast.options.dp]; separator=",">);
>>

MatchToken(m) ::= <<
Expand Down
4 changes: 2 additions & 2 deletions tool/resources/org/antlr/v4/tool/templates/codegen/JavaScript/JavaScript.stg
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Expand Up @@ -240,7 +240,7 @@ RuleSempredFunction(r, actions) ::= <<
RuleFunction(currentRule,args,code,locals,ruleCtx,altLabelCtxs,namedActions,finallyAction,postamble,exceptions) ::= <<


<currentRule.escapedName>(<currentRule.args:{a | <a.escapedName>}; separator=", ">) {
<currentRule.escapedName>(<[currentRule.args:{a | <a.escapedName>}, currentRule.hasDelegatedPrecedence:{_|_dp=0}]; separator=", ">) {
let localctx = new <currentRule.ctxType>(this, this._ctx, this.state<currentRule.args:{a | , <a.escapedName>}>);
this.enterRule(localctx, <currentRule.startState>, <parser.name>.RULE_<currentRule.name>);
<namedActions.init>
Expand Down Expand Up @@ -480,7 +480,7 @@ cases(tokens) ::= <<

InvokeRule(r, argExprsChunks) ::= <<
this.state = <r.stateNumber>;
<if(r.labels)><r.labels:{l | <labelref(l)> = }><endif>this.<r.escapedName>(<if(r.ast.options.p)><r.ast.options.p><if(argExprsChunks)>,<endif><endif><argExprsChunks>);
<if(r.labels)><r.labels:{l | <labelref(l)> = }><endif>this.<r.escapedName>(<[r.ast.options.p, argExprsChunks, r.ast.options.dp]; separator=",">);
>>

MatchToken(m) ::= <<
Expand Down
14 changes: 12 additions & 2 deletions tool/resources/org/antlr/v4/tool/templates/codegen/PHP/PHP.stg
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Expand Up @@ -446,10 +446,20 @@ private function sempred<r.name; format="cap">(?Context\\<r.ctxType> $localConte
>>

RuleFunction(currentRule,args,code,locals,ruleCtx,altLabelCtxs,namedActions,finallyAction,exceptions,postamble) ::= <<
<if(currentRule.hasDelegatedPrecedence)>
/**
* InvokeRule references the recursive function in case a p option is present - which we re-use for delegated precedence
* @throws RecognitionException
*/
<if(currentRule.modifiers)><currentRule.modifiers:{f | <f> }><endif>public function <currentRule.name>(<args; separator=",">): Context\\<currentRule.ctxType>
<if(currentRule.modifiers)><currentRule.modifiers:{f | <f> }><endif>public function recursive<currentRule.name; format="cap">(<[args, currentRule.hasDelegatedPrecedence:{_|$_dp=0}]; separator=",">): Context\\<currentRule.ctxType>
{
return $this-><currentRule.name>(<[args:{a|<a.name>}, {$_dp}]; separator=",">);
}
<endif>
/**
* @throws RecognitionException
*/
<if(currentRule.modifiers)><currentRule.modifiers:{f | <f> }><endif>public function <currentRule.name>(<[args, currentRule.hasDelegatedPrecedence:{_|$_dp=0}]; separator=",">): Context\\<currentRule.ctxType>
{
$localContext = new Context\\<currentRule.ctxType>($this->ctx, $this->getState()<currentRule.args:{a | , $<a.name>}>);

Expand Down Expand Up @@ -701,7 +711,7 @@ cases(tokens) ::= <<

InvokeRule(r, argExprsChunks) ::= <<
$this->setState(<r.stateNumber>);
<if(r.labels)><r.labels:{l | <labelref(l)> = }><endif>$this-><if(r.ast.options.p)>recursive<r.name; format="cap"><else><r.name><endif>(<if(r.ast.options.p)><r.ast.options.p><if(argExprsChunks)>,<endif><endif><argExprsChunks>);
<if(r.labels)><r.labels:{l | <labelref(l)> = }><endif>$this-><if(r.ast.options.p)>recursive<r.name; format="cap"><else><r.name><endif>(<[{<if(r.ast.options.pv)>$<endif><r.ast.options.p>}, argExprsChunks, r.ast.options.dp]; separator=",">);
>>

MatchToken(m) ::= <<
Expand Down
4 changes: 2 additions & 2 deletions tool/resources/org/antlr/v4/tool/templates/codegen/Python3/Python3.stg
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Expand Up @@ -263,7 +263,7 @@ RuleFunction(currentRule,args,code,locals,ruleCtx,altLabelCtxs,namedActions,fina

<altLabelCtxs:{l | <altLabelCtxs.(l)>}; separator="\n">

def <currentRule.escapedName>(self<currentRule.args:{a | , <a.escapedName><if(a.type)>:<a.type><endif>}>):
def <currentRule.escapedName>(self<currentRule.args:{a | , <a.escapedName><if(a.type)>:<a.type><endif>}><if(currentRule.hasDelegatedPrecedence)>, _dp:int=0<endif>):

localctx = <parser.name>.<currentRule.ctxType>(self, self._ctx, self.state<currentRule.args:{a | , <a.escapedName>}>)
self.enterRule(localctx, <currentRule.startState>, self.RULE_<currentRule.name>)
Expand Down Expand Up @@ -491,7 +491,7 @@ if token in [<tokens:{t | <t.type>}; separator=", ">]:

InvokeRule(r, argExprsChunks) ::= <<
self.state = <r.stateNumber>
<if(r.labels)><r.labels:{l | <labelref(l)> = }><endif>self.<r.escapedName>(<if(r.ast.options.p)><r.ast.options.p><if(argExprsChunks)>,<endif><endif><argExprsChunks>)
<if(r.labels)><r.labels:{l | <labelref(l)> = }><endif>self.<r.escapedName>( <[r.ast.options.p, argExprsChunks:{a| <a;separator=",">}, r.ast.options.dp:{v | _dp=<v>}]; separator=",">)
>>

MatchToken(m) ::= <<
Expand Down
6 changes: 3 additions & 3 deletions tool/resources/org/antlr/v4/tool/templates/codegen/Swift/Swift.stg
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Expand Up @@ -393,7 +393,7 @@ RuleFunction(currentRule,args,code,locals,ruleCtx,altLabelCtxs,namedActions,fina
<ruleCtx>
<altLabelCtxs:{l | <altLabelCtxs.(l)>}; separator="\n">
@discardableResult
<if(currentRule.modifiers)><currentRule.modifiers:{f | <f> }><else> <accessLevelOpenOK(parser)> func <endif><currentRule.escapedName>(<if(first(args))>_ <endif><args; separator=", _">) throws -> <currentRule.ctxType> {
<if(currentRule.modifiers)><currentRule.modifiers:{f | <f> }><else> <accessLevelOpenOK(parser)> func <endif><currentRule.escapedName>(<[args:{a | _ <a>}, currentRule.hasDelegatedPrecedence:{_ | _ _dp : Int = 0 }]; separator=", ">) throws -> <currentRule.ctxType> {
var _localctx: <currentRule.ctxType>
_localctx = <currentRule.ctxType>(_ctx, getState()<currentRule.args:{a | , <a.escapedName>}>)
try enterRule(_localctx, <currentRule.startState>, <parser.name>.RULE_<currentRule.name>)
Expand Down Expand Up @@ -645,10 +645,10 @@ InvokeRule(r, argExprsChunks) ::= <<
setState(<r.stateNumber>)
<if(r.labels)>
try {
let assignmentValue = try <r.escapedName>(<if(r.ast.options.p)><r.ast.options.p><if(argExprsChunks)>,<endif><endif><argExprsChunks>)
let assignmentValue = try <r.escapedName>(<[r.ast.options.p, argExprsChunks, r.ast.options.dp]; separator=",">)
<r.labels:{l | <labelref(l)> = assignmentValue} ; separator="\n">
}()
<else>try <r.escapedName>(<if(r.ast.options.p)><r.ast.options.p><if(argExprsChunks)>,<endif><endif><argExprsChunks>)<endif>
<else>try <r.escapedName>(<[r.ast.options.p, argExprsChunks, r.ast.options.dp]; separator=",">)<endif>
>>

MatchToken(m) ::= <<
Expand Down
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