1
我有點困惑。我的語法運行良好,符合我的語言,就像我想要的一樣。最近,我在語法上添加了一些規則,並且在將新語法規則轉換爲樹語法的過程中,我收到了一些奇怪的錯誤。我得到的第一個錯誤是樹語法不明確。爲什麼我的樹語法不明確?
我收到的錯誤是:
[10:53:16] warning(200): ShiroDefinitionPass.g:129:17:
Decision can match input such as "'subjunctive node'" using multiple alternatives: 5, 6
As a result, alternative(s) 6 were disabled for that input
[10:53:16] warning(200): ShiroDefinitionPass.g:129:17:
Decision can match input such as "PORT_ASSIGNMENT" using multiple alternatives: 2, 6
和大約10多個類似的錯誤。
我不知道爲什麼樹語法是不明確的。在我添加sNode,subjunctDeclNodeProd,subjunctDecl和subjunctSelector規則之前,這很好。
我的語法是:
grammar Shiro;
options{
language = Java;
ASTLabelType=CommonTree;
output=AST;
}
tokens{
NEGATION;
STATE_DECL;
PORT_DECL;
PORT_INIT;
PORT_ASSIGNMENT;
PORT_TAG;
PATH;
PORT_INDEX;
EVAL_SELECT;
SUBJ_SELECT;
SUBJ_NODE_PROD;
ACTIVATION;
ACTIVATION_LIST;
PRODUCES;
}
shiro : statement+
;
statement
: nodestmt
| sNode
| graphDecl
| statestmt
| collection
| view
| NEWLINE!
;
view : 'view' IDENT mfName IDENT -> ^('view' IDENT mfName IDENT)
;
collection
: 'collection' IDENT orderingFunc path 'begin' NEWLINE
(collItem)+ NEWLINE?
'end'
-> ^('collection' IDENT orderingFunc path collItem+)
;
collItem: IDENT -> IDENT
;
orderingFunc
: IDENT -> IDENT
;
statestmt
: 'state' stateName 'begin' NEWLINE
stateHeader
'end' -> ^(STATE_DECL stateName stateHeader)
;
stateHeader
: (stateTimeStmt | stateCommentStmt | stateParentStmt | stateGraphStmt | activationPath | NEWLINE!)+
;
stateTimeStmt
: 'Time' time -> ^('Time' time)
;
stateCommentStmt
: 'Comment' comment -> ^('Comment' comment)
;
stateParentStmt
: 'Parent' stateParent -> ^('Parent' stateParent)
;
stateGraphStmt
: 'Graph' stateGraph -> ^('Graph' stateGraph)
;
stateName
: IDENT
;
time : STRING_LITERAL
;
comment : STRING_LITERAL
;
stateParent
: IDENT
;
stateGraph
: IDENT
;
activationPath
: l=activation ('.'^ (r=activation | activationList))*
;
activationList
: '<' activation (',' activation)* '>' -> ^(ACTIVATION_LIST activation+)
;
activation
: c=IDENT ('[' v=IDENT ']')? -> ^(ACTIVATION $c ($v)?)
;
graphDecl
: 'graph' IDENT 'begin' NEWLINE
graphLine+
'end'
-> ^('graph' IDENT graphLine+)
;
graphLine
: nodeProduction | portAssignment | NEWLINE!
;
nodeInternal
: (nodeProduction
| portAssignment
| portstmt
| nodestmt
| sNode
| NEWLINE!)+
;
nodestmt
: 'node'^ IDENT ('['! activeSelector ']'!)? 'begin'! NEWLINE!
nodeInternal
'end'!
;
sNode
: 'subjunctive node'^ IDENT '['! subjunctSelector ']'! 'begin'! NEWLINE!
(subjunctDeclNodeProd | subjunctDecl | NEWLINE!)+
'end'!
;
subjunctDeclNodeProd
: l=IDENT '->' r=IDENT 'begin' NEWLINE
nodeInternal
'end' -> ^(SUBJ_NODE_PROD $l $r nodeInternal)
;
subjunctDecl
: 'subjunct'^ IDENT ('['! activeSelector ']'!)? 'begin'! NEWLINE!
nodeInternal
'end'!
;
subjunctSelector
: IDENT -> ^(SUBJ_SELECT IDENT)
;
activeSelector
: IDENT -> ^(EVAL_SELECT IDENT)
;
nodeProduction
: path ('->'^ activationPath)+ NEWLINE!
;
portAssignment
: path '(' mfparams ')' NEWLINE -> ^(PORT_ASSIGNMENT path mfparams)
;
portDecl
: portType portName mfName -> ^(PORT_DECL ^(PORT_TAG portType) portName mfName)
;
portDeclInit
: portType portName mfCall -> ^(PORT_INIT ^(PORT_TAG portType) portName mfCall)
;
portstmt
: (portDecl | portDeclInit) NEWLINE!
;
portName
: IDENT
;
portType: 'port'
| 'eval'
;
mfCall : mfName '(' mfparams ')' -> ^(mfName mfparams)
;
mfName : IDENT
;
mfparams: expression(',' expression)* -> expression+
;
// Path
path : (IDENT)('.' IDENT)*('[' pathIndex ']')? -> ^(PATH IDENT+ pathIndex?)
;
pathIndex
: portIndex -> ^(PORT_INDEX portIndex)
;
portIndex
: (NUMBER |STRING_LITERAL)
;
// Expressions
term : path
| '(' expression ')' -> expression
| NUMBER
| STRING_LITERAL
;
unary : ('+'^ | '-'^)* term
;
mult : unary (('*'^ | '/'^ | '%'^) unary)*
;
add
: mult (('+'^ | '-'^) mult)*
;
expression
: add (('|'^) add)*
;
// LEXEMES
STRING_LITERAL
: '"' .* '"'
;
NUMBER : DIGIT+ ('.'DIGIT+)?
;
IDENT : (LCLETTER | UCLETTER | DIGIT)(LCLETTER | UCLETTER | DIGIT|'_')*
;
COMMENT
: '//' ~('\n'|'\r')* {$channel=HIDDEN;}
| '/*' (options {greedy=false;} : .)* '*/' NEWLINE?{$channel=HIDDEN;}
;
WS
: (' ' | '\t' | '\f')+ {$channel = HIDDEN;}
;
NEWLINE : '\r'? '\n'
;
fragment
LCLETTER
: 'a'..'z'
;
fragment
UCLETTER: 'A'..'Z'
;
fragment
DIGIT : '0'..'9'
;
我的樹語法的部分看起來像:
tree grammar ShiroDefinitionPass;
options{
tokenVocab=Shiro;
ASTLabelType=CommonTree;
}
shiro
: statement+
;
statement
: nodestmt
| sNode
| graphDecl
| statestmt
| collection
| view
;
view : ^('view' IDENT mfName IDENT)
;
collection
: ^('collection' IDENT orderingFunc path collItem+)
;
collItem: IDENT
;
orderingFunc
: IDENT
;
statestmt
: ^(STATE_DECL stateHeader)
;
stateHeader
: (stateTimeStmt | stateCommentStmt | stateParentStmt| stateGraphStmt | activation)+
;
stateTimeStmt
: ^('Time' time)
;
stateCommentStmt
: ^('Comment' comment)
;
stateParentStmt
: ^('Parent' stateParent)
;
stateGraphStmt
: ^('Graph' stateGraph)
;
stateName
: IDENT
;
time : STRING_LITERAL
;
comment : STRING_LITERAL
;
stateParent
: IDENT
;
stateGraph
: IDENT
;
activationPath
: l=activation ('.' (r=activation | activationList))*
;
activationList
: ^(ACTIVATION_LIST activation+)
;
activation
: ^(ACTIVATION IDENT IDENT?)
;
// Graph Declarations
graphDecl
: ^('graph' IDENT graphLine+)
;
graphLine
: nodeProduction
| portAssignmen
;
// End Graph declaration
nodeInternal
: (nodeProduction
|portAssignment
|portstmt
|nodestmt
|sNode)+
;
nodestmt
: ^('node' IDENT activeSelector? nodeInternal)
;
sNode
: ^('subjunctive node' IDENT subjunctSelector (subjunctDeclNodeProd | subjunctDecl)*)
;
subjunctDeclNodeProd
: ^(SUBJ_NODE_PROD IDENT IDENT nodeInternal+)
;
subjunctDecl
: ^('subjunct' IDENT activeSelector? nodeInternal)
;
subjunctSelector
: ^(SUBJ_SELECT IDENT)
;
activeSelector returns
: ^(EVAL_SELECT IDENT)
;
nodeProduction
: ^('->' nodeProduction)
| path
;
portAssignment
: ^(PORT_ASSIGNMENT path)
;
// Port Statement
portDecl
: ^(PORT_DECL ^(PORT_TAG portType) portName mfName)
;
portDeclInit
: ^(PORT_INIT ^(PORT_TAG portType) portName mfCall)
;
portstmt
: (portDecl | portDeclInit)
;
portName
: IDENT
;
portType returns
: 'port' | 'eval'
;
mfCall
: ^(mfName mfparams)
;
mfName
: IDENT
;
mfparams
: (exps=expression)+
;
// Path
path
: ^(PATH (id=IDENT)+ (pathIndex)?)
;
pathIndex
: ^(PORT_INDEX portIndex)
;
portIndex
: (NUMBER
|STRING_LITERAL
)
;
// Expressions
expression
: ^('+' op1=expression op2=expression)
| ^('-' op1=expression op2=expression)
| ^('*' op1=expression op2=expression)
| ^('/' op1=expression op2=expression)
| ^('%' op1=expression op2=expression)
| ^('|' op1=expression op2=expression)
| NUMBER
| path
;
海事組織,有太多的代碼/語法去通過。我可能會考慮給你的語法通過ANTLRWorks,但是你需要發佈2個clean(無自定義代碼!)語法文件,我可以簡單地複製和粘貼並查看你看到的錯誤。你的語法片段缺少太多的東西來測試。 –
是的你是對的。對於那個很抱歉。對我而言,這是sl iness不馴的。我已經刪除了自定義代碼。 –
沒問題,但它不是*只是*嵌入式代碼,如果這是唯一的東西(我很懶,但不* *表示懶惰:)),我會自己刪除它。我看到'token' {...}塊丟失,'activationPath'規則丟失(也許更多?)。我問你的是發佈2個語法(組合和樹),根本不需要編輯:所以從語法定義開始。這不僅有利於像我這樣的(懶惰)人,還能確保我看到你所看到的。 –