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Implementing Programming Languages Using C# 4.0

, 12 Jul 2012 MIT
An introduction to creating programming language tools using C# 4.0.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Diggins.Jigsaw
{
    /// <summary>
    /// See: http://docs.python.org/reference/grammar.html
    /// single_input: NEWLINE | simple_stmt | compound_stmt NEWLINE
    /// file_input: (NEWLINE | stmt)* ENDMARKER
    /// eval_input: testlist NEWLINE* ENDMARKER
    /// decorator: '@' dotted_name [ '(' [arglist] ')' ] NEWLINE
    /// decorators: decorator+
    /// decorated: decorators (classdef | funcdef)
    /// funcdef: 'def' NAME parameters ':' suite
    /// parameters: '(' [varargslist] ')'
    /// varargslist: ((fpdef ['=' test] ',')* ('*' NAME [',' '**' NAME] | '**' NAME) | fpdef ['=' test] (',' fpdef ['=' test])* [','])
    /// fpdef: NAME | '(' fplist ')'
    /// fplist: fpdef (',' fpdef)* [',']
    /// stmt: simple_stmt | compound_stmt
    /// simple_stmt: small_stmt (';' small_stmt)* [';'] NEWLINE
    /// small_stmt: (expr_stmt | print_stmt  | del_stmt | pass_stmt | flow_stmt | import_stmt | global_stmt | exec_stmt | assert_stmt)
    /// expr_stmt: testlist (augassign (yield_expr|testlist) | ('=' (yield_expr|testlist))*)
    /// augassign: ('+=' | '-=' | '*=' | '/=' | '%=' | '&=' | '|=' | '^=' | '<<=' | '>>=' | '**=' | '/// =')
    /// print_stmt: 'print' ( [ test (',' test)* [','] ] | '>>' test [ (',' test)+ [','] ] )
    /// del_stmt: 'del' exprlist
    /// pass_stmt: 'pass'
    /// flow_stmt: break_stmt | continue_stmt | return_stmt | raise_stmt | yield_stmt
    /// break_stmt: 'break'
    /// continue_stmt: 'continue'
    /// return_stmt: 'return' [testlist]
    /// yield_stmt: yield_expr
    /// raise_stmt: 'raise' [test [',' test [',' test]]]
    /// import_stmt: import_name | import_from
    /// import_name: 'import' dotted_as_names
    /// import_from: ('from' ('.'* dotted_name | '.'+) 'import' ('*' | '(' import_as_names ')' | import_as_names))
    /// import_as_name: NAME ['as' NAME]
    /// dotted_as_name: dotted_name ['as' NAME]
    /// import_as_names: import_as_name (',' import_as_name)* [',']
    /// dotted_as_names: dotted_as_name (',' dotted_as_name)*
    /// dotted_name: NAME ('.' NAME)*
    /// global_stmt: 'global' NAME (',' NAME)*
    /// exec_stmt: 'exec' expr ['in' test [',' test]]
    /// assert_stmt: 'assert' test [',' test]
    /// if_stmt: 'if' test ':' suite ('elif' test ':' suite)* ['else' ':' suite]
    /// while_stmt: 'while' test ':' suite ['else' ':' suite]
    /// for_stmt: 'for' exprlist 'in' testlist ':' suite ['else' ':' suite]
    /// try_stmt: ('try' ':' suite ((except_clause ':' suite)+ ['else' ':' suite] ['finally' ':' suite] | 'finally' ':' suite))
    /// with_stmt: 'with' with_item (',' with_item)*  ':' suite
    /// with_item: test ['as' expr]
    /// except_clause: 'except' [test [('as' | ',') test]]
    /// suite: simple_stmt | NEWLINE INDENT stmt+ DEDENT
    /// testlist_safe: old_test [(',' old_test)+ [',']]
    /// old_test: or_test | old_lambdef
    /// old_lambdef: 'lambda' [varargslist] ':' old_test
    /// test: or_test ['if' or_test 'else' test] | lambdef
    /// or_test: and_test ('or' and_test)*
    /// and_test: not_test ('and' not_test)*
    /// not_test: 'not' not_test | comparison
    /// comparison: expr (comp_op expr)*
    /// comp_op: '<'|'>'|'=='|'>='|'<='|'<>'|'!='|'in'|'not' 'in'|'is'|'is' 'not'
    /// expr: xor_expr ('|' xor_expr)*
    /// xor_expr: and_expr ('^' and_expr)*
    /// and_expr: shift_expr ('&' shift_expr)*
    /// shift_expr: arith_expr (('<<'|'>>') arith_expr)*
    /// arith_expr: term (('+'|'-') term)*
    /// term: factor (('*'|'/'|'%'|'/// ') factor)*
    /// factor: ('+'|'-'|'~') factor | power
    /// power: atom trailer* ['**' factor]
    /// atom: ('(' [yield_expr|testlist_comp] ')' | '[' [listmaker] ']' | '{' [dictorsetmaker] '}' | '`' testlist1 '`' | NAME | NUMBER | STRING+)
    /// listmaker: test ( list_for | (',' test)* [','] )
    /// testlist_comp: test ( comp_for | (',' test)* [','] )
    /// lambdef: 'lambda' [varargslist] ':' test
    /// trailer: '(' [arglist] ')' | '[' subscriptlist ']' | '.' NAME
    /// subscriptlist: subscript (',' subscript)* [',']
    /// subscript: '.' '.' '.' | test | [test] ':' [test] [sliceop]
    /// sliceop: ':' [test]
    /// exprlist: expr (',' expr)* [',']
    /// testlist: test (',' test)* [',']
    /// dictorsetmaker: ( (test ':' test (comp_for | (',' test ':' test)* [','])) | (test (comp_for | (',' test)* [','])) )
    /// classdef: 'class' NAME ['(' [testlist] ')'] ':' suite
    /// arglist: (argument ',')* (argument [','] |'*' test (',' argument)* [',' '**' test] |'**' test)
    /// argument: test [comp_for] | test '=' test
    /// list_iter: list_for | list_if
    /// list_for: 'for' exprlist 'in' testlist_safe [list_iter]
    /// list_if: 'if' old_test [list_iter]
    /// comp_iter: comp_for | comp_if
    /// comp_for: 'for' exprlist 'in' or_test [comp_iter]
    /// comp_if: 'if' old_test [comp_iter]
    /// testlist1: test (',' test)*
    /// yield_expr: 'yield' [testlist]        
    /// </summary>
    class PythonGrammar
    {     
    }
}

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About the Author

Christopher Diggins
Software Developer Autodesk
Canada Canada
This article was written by Christopher Diggins, a computer science nerd who currently works at Autodesk as an SDK specialist.

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