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|
/*
La grammatica di Python si trova a
https://docs.python.org/3/reference/grammar.html
Questa e` stata elaborata da Bart Kiers, bart@big-o.nl
e si trova a https://github.com/bkiers/python3-parser
Semplificata ai fini del corso di CLP -- Marco Bertoni, Cosimo Laneve
*/
// $antlr-format alignTrailingComments true, columnLimit 150, minEmptyLines 1, maxEmptyLinesToKeep 1, reflowComments false, useTab false
// $antlr-format allowShortRulesOnASingleLine false, allowShortBlocksOnASingleLine true, alignSemicolons hanging, alignColons hanging
parser grammar Python3Parser;
options {
superClass = Python3ParserBase;
tokenVocab = Python3Lexer;
}
root
: NEWLINE* (simple_stmts | compound_stmt)* EOF
;
simple_stmts
: simple_stmt (';' simple_stmt)* ';'? NEWLINE
;
compound_stmt
: if_stmt
| while_stmt
| for_stmt
| funcdef
;
simple_stmt
: assignment
| expr
| return_stmt
| import_stm
;
assignment
: exprlist augassign exprlist
;
return_stmt
: 'return' exprlist?
;
import_stm
: 'import' dotted_name ('as' NAME)?
| 'from' dotted_name 'import' (NAME (',' NAME)* | '*')
;
dotted_name
: NAME ('.' NAME)*
;
funcdef
: 'def' NAME '(' paramlist? ')' ':' block
;
paramlist
: paramdef ('=' expr)? (',' paramdef ('=' expr)?)*
;
paramdef
: NAME (':' expr)?
;
augassign
: '='
| '+='
| '-='
| '*='
| '@='
| '/='
| '%='
| '&='
| '|='
| '^='
| '<<='
| '>>='
| '**='
| '//='
;
if_stmt
: 'if' expr ':' block ('elif' expr ':' block)* ('else' ':' block)?
;
while_stmt
: 'while' expr ':' block ('else' ':' block)?
;
for_stmt
: 'for' exprlist ':' block ('else' ':' block)?
;
block
: simple_stmts
| NEWLINE INDENT (simple_stmts | compound_stmt)+ DEDENT
;
comp_op
: '<'
| '>'
| '=='
| '>='
| '<='
| '<>'
| '!='
| 'in'
| 'not' 'in'
| 'is'
| 'is' 'not'
;
expr
: atom trailer*
| expr '**' expr
| ('+' | '-' | '~')+ expr
| expr ('*' | '@' | '/' | '%' | '//') expr
| expr ('+' | '-') expr
| expr ('<<' | '>>') expr
| expr '&' expr
| expr '^' expr
| expr '|' expr
| 'not' expr
| expr comp_op expr
| expr 'and' expr
| expr 'or' expr
| expr 'if' expr 'else' expr
;
atom
: '(' testlist_comp? ')'
| '[' testlist_comp? ']'
| '{' testlist_comp? '}'
| NAME
| NUMBER
| STRING+
| '...'
| 'None'
| 'True'
| 'False'
;
testlist_comp : expr (comp_for | (',' expr)* ','?)
;
trailer
: '(' arglist? ')'
| '[' expr (',' expr)* ','? ']'
| '.' NAME
| '[' expr? ':' expr? (':' expr? )? ']'
;
exprlist
: expr (',' expr )* ','?
;
arglist
: argument (',' argument)* ','?
;
argument
: expr comp_for? | expr '=' expr
;
comp_iter
: comp_for
| comp_if
;
comp_for
: 'for' exprlist 'in' expr comp_iter?
;
comp_if
: 'if' expr comp_iter?
;
|
