45 lines
1.5 KiB
ANTLR
45 lines
1.5 KiB
ANTLR
parser grammar Python3Parser;
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options {
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tokenVocab = Python3Lexer;
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}
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file_input: (NEWLINE | stmt)* EOF;
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funcdef: 'def' NAME parameters ':' suite;
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parameters: '(' typedargslist? ')';
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typedargslist: (tfpdef ('=' test)? (',' tfpdef ('=' test)?)*);
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tfpdef: NAME ;
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stmt: simple_stmt | compound_stmt;
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simple_stmt: small_stmt NEWLINE;
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small_stmt: expr_stmt | flow_stmt;
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expr_stmt: testlist ( (augassign testlist) |
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('=' testlist)*);//连等 加等/减等/...
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augassign: ('+=' | '-=' | '*=' | '/=' | '//=' | '%=' );
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flow_stmt: break_stmt | continue_stmt | return_stmt;
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break_stmt: 'break';
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continue_stmt: 'continue';
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return_stmt: 'return' (testlist)?;
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compound_stmt: if_stmt | while_stmt | funcdef ;
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if_stmt: 'if' test ':' suite ('elif' test ':' suite)* ('else' ':' suite)?;
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while_stmt: 'while' test ':' suite;
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suite: simple_stmt | NEWLINE INDENT stmt+ DEDENT;
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test: or_test ;
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or_test: and_test ('or' and_test)*;
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and_test: not_test ('and' not_test)*;
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not_test: 'not' not_test | comparison;
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comparison: arith_expr (comp_op arith_expr)*;
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comp_op: '<'|'>'|'=='|'>='|'<=' | '!=';
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arith_expr: term (addorsub_op term)*;
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addorsub_op: '+'|'-';
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term: factor (muldivmod_op factor)*;
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muldivmod_op: '*'|'/'|'//'|'%';
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factor: ('+'|'-') factor | atom_expr;
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atom_expr: atom trailer?;
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trailer: '(' (arglist)? ')' ;
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atom: (NAME | NUMBER | STRING+| 'None' | 'True' | 'False' | ('(' test ')'));
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testlist: test (',' test)* (',')?;//算式 eg： a,b a a+b
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arglist: argument (',' argument)* (',')?;
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argument: ( test |
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test '=' test );
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