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王立帮
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boards/default_src/python/python_generator.js
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308
boards/default_src/python/python_generator.js
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/*
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Overrides for generic Python code generation.
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*/
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import * as Blockly from 'blockly/core';
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import Names from './others/names';
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/**
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* Python code generator.
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* @type {!Blockly.Generator}
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*/
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export const Python = new Blockly.Generator('Python');
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Python.INDENT = " ";
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/**
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* List of illegal variable names.
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* This is not intended to be a security feature. Blockly is 100% client-side,
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* so bypassing this list is trivial. This is intended to prevent users from
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* accidentally clobbering a built-in object or function.
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* @private
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*/
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Python.addReservedWords(
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// import keyword
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// print(','.join(sorted(keyword.kwlist)))
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// https://docs.python.org/3/reference/lexical_analysis.html#keywords
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// https://docs.python.org/2/reference/lexical_analysis.html#keywords
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'False,None,True,and,as,assert,break,class,continue,def,del,elif,else,' +
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'except,exec,finally,for,from,global,if,import,in,is,lambda,nonlocal,not,' +
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'or,pass,print,raise,return,try,while,with,yield,' +
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// https://docs.python.org/3/library/constants.html
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// https://docs.python.org/2/library/constants.html
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'NotImplemented,Ellipsis,__debug__,quit,exit,copyright,license,credits,' +
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// >>> print(','.join(sorted(dir(__builtins__))))
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// https://docs.python.org/3/library/functions.html
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// https://docs.python.org/2/library/functions.html
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'ArithmeticError,AssertionError,AttributeError,BaseException,' +
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'BlockingIOError,BrokenPipeError,BufferError,BytesWarning,' +
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'ChildProcessError,ConnectionAbortedError,ConnectionError,' +
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'ConnectionRefusedError,ConnectionResetError,DeprecationWarning,EOFError,' +
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'Ellipsis,EnvironmentError,Exception,FileExistsError,FileNotFoundError,' +
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'FloatingPointError,FutureWarning,GeneratorExit,IOError,ImportError,' +
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'ImportWarning,IndentationError,IndexError,InterruptedError,' +
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'IsADirectoryError,KeyError,KeyboardInterrupt,LookupError,MemoryError,' +
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'ModuleNotFoundError,NameError,NotADirectoryError,NotImplemented,' +
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'NotImplementedError,OSError,OverflowError,PendingDeprecationWarning,' +
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'PermissionError,ProcessLookupError,RecursionError,ReferenceError,' +
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'ResourceWarning,RuntimeError,RuntimeWarning,StandardError,' +
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'StopAsyncIteration,StopIteration,SyntaxError,SyntaxWarning,SystemError,' +
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'SystemExit,TabError,TimeoutError,TypeError,UnboundLocalError,' +
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'UnicodeDecodeError,UnicodeEncodeError,UnicodeError,' +
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'UnicodeTranslateError,UnicodeWarning,UserWarning,ValueError,Warning,' +
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'ZeroDivisionError,_,__build_class__,__debug__,__doc__,__import__,' +
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'__loader__,__name__,__package__,__spec__,abs,all,any,apply,ascii,' +
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'basestring,bin,bool,buffer,bytearray,bytes,callable,chr,classmethod,cmp,' +
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'coerce,compile,complex,copyright,credits,delattr,dict,dir,divmod,' +
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'enumerate,eval,exec,execfile,exit,file,filter,float,format,frozenset,' +
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'getattr,globals,hasattr,hash,help,hex,id,input,int,intern,isinstance,' +
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'issubclass,iter,len,license,list,locals,long,map,max,memoryview,min,' +
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'next,object,oct,open,ord,pow,print,property,quit,range,raw_input,reduce,' +
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'reload,repr,reversed,round,set,setattr,slice,sorted,staticmethod,str,' +
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'sum,super,tuple,type,unichr,unicode,vars,xrange,zip'
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);
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/**
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* Order of operation ENUMs.
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* http://docs.python.org/reference/expressions.html#summary
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*/
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Python.ORDER_ATOMIC = 0; // 0 "" ...
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Python.ORDER_COLLECTION = 1; // tuples, lists, dictionaries
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Python.ORDER_STRING_CONVERSION = 1; // `expression...`
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Python.ORDER_UNARY_POSTFIX = 1; // expr++ expr-- () [] .
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Python.ORDER_UNARY_PREFIX = 2; // -expr !expr ~expr ++expr --expr
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Python.ORDER_MEMBER = 2.1; // . []
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Python.ORDER_FUNCTION_CALL = 2.2; // ()
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Python.ORDER_EXPONENTIATION = 3; // **
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Python.ORDER_UNARY_SIGN = 4; // + -
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Python.ORDER_BITWISE_NOT = 4; // ~
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Python.ORDER_MULTIPLICATIVE = 5; // * / // %
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Python.ORDER_ADDITIVE = 6; // + -
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Python.ORDER_BITWISE_SHIFT = 7; // << >>
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Python.ORDER_BITWISE_AND = 8; // &
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Python.ORDER_BITWISE_XOR = 9; // ^
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Python.ORDER_BITWISE_OR = 10; // |
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Python.ORDER_RELATIONAL = 11; // in, not in, is, is not,
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// <, <=, >, >=, <>, !=, ==
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Python.ORDER_EQUALITY = 11; // == != === !==
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Python.ORDER_LOGICAL_NOT = 12; // not
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Python.ORDER_LOGICAL_AND = 13; // and
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Python.ORDER_LOGICAL_OR = 14; // or
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Python.ORDER_ASSIGNMENT = 14; // = *= /= ~/= %= += -= <<= >>= &= ^= |=
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Python.ORDER_CONDITIONAL = 15; // if else
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Python.ORDER_LAMBDA = 16; // lambda
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Python.ORDER_NONE = 99; // (...)
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/**
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* List of outer-inner pairings that do NOT require parentheses.
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* @type {!Array.<!Array.<number>>}
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*/
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Python.ORDER_OVERRIDES = [
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// (foo()).bar -> foo().bar
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// (foo())[0] -> foo()[0]
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[Python.ORDER_FUNCTION_CALL, Python.ORDER_MEMBER],
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// (foo())() -> foo()()
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[Python.ORDER_FUNCTION_CALL, Python.ORDER_FUNCTION_CALL],
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// (foo.bar).baz -> foo.bar.baz
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// (foo.bar)[0] -> foo.bar[0]
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// (foo[0]).bar -> foo[0].bar
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// (foo[0])[1] -> foo[0][1]
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[Python.ORDER_MEMBER, Python.ORDER_MEMBER],
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// (foo.bar)() -> foo.bar()
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// (foo[0])() -> foo[0]()
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[Python.ORDER_MEMBER, Python.ORDER_FUNCTION_CALL],
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// not (not foo) -> not not foo
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// [Python.ORDER_LOGICAL_NOT, Python.ORDER_LOGICAL_NOT],
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// a and (b and c) -> a and b and c
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// [Python.ORDER_LOGICAL_AND, Python.ORDER_LOGICAL_AND],
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// a or (b or c) -> a or b or c
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// [Python.ORDER_LOGICAL_OR, Python.ORDER_LOGICAL_OR]
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];
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Python.init = function () {
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/**
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* Empty loops or conditionals are not allowed in Python.
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*/
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Python.PASS = this.INDENT + 'pass\n';
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// Create a dictionary of definitions to be printed before the code.
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Python.definitions_ = Object.create(null);
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// Create a dictionary mapping desired function names in definitions_
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// to actual function names (to avoid collisions with user functions).
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Python.functionNames_ = Object.create(null);
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Python.setups_ = Object.create(null);
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Python.loops_ = Object.create(null);
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Python.codeEnd_ = Object.create(null);
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if (!Python.variableDB_) {
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Python.variableDB_ = new Names(Python.RESERVED_WORDS_);
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} else {
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Python.variableDB_.reset();
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}
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}
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Python.finish = function (code) {
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// Convert the definitions dictionary into a list.
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if (code !== "") {
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code = code.replace(/\n/g, '\n');
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code = code.replace(/\n\s+$/, '\n');
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}
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var definitions = [];
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for (var name in Python.definitions_) {
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definitions.push(Python.definitions_[name]);
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}
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var functions = [];
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for (var name in Python.functions_) {
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functions.push(Python.functions_[name]);
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}
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var setups = [];
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for (var name in Python.setups_) {
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setups.push(Python.setups_[name]);
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}
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if (setups.length !== 0)
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setups.push('\n');
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var loops = [];
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for (var name in Python.loops_) {
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loops.push(Python.loops_[name]);
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}
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var codeEnd = [];
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for (var name in Python.codeEnd_) {
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codeEnd.push(Python.codeEnd_[name]);
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}
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if (codeEnd.length !== 0)
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codeEnd.push('\n');
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// Clean up temporary data.
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//delete Python.definitions_;
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//delete Python.functionNames_;
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//Python.variableDB_.reset();
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if (loops.length > 0)
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return definitions.join('\n') + '\n' + functions.join('\n') + '\n' + setups.join('') + '\n' + code + 'while True:\n' + loops.join('') + codeEnd.join('\n');
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return definitions.join('\n') + '\n' + functions.join('\n') + '\n' + setups.join('') + '\n' + code + codeEnd.join('\n');
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};
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/**
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* Naked values are top-level blocks with outputs that aren't plugged into
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* anything.
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* @param {string} line Line of generated code.
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* @return {string} Legal line of code.
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*/
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Python.scrubNakedValue = function (line) {
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return line + '\n';
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};
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/**
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* Encode a string as a properly escaped Python string, complete with quotes.
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* @param {string} string Text to encode.
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* @return {string} Python string.
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* @private
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*/
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Python.quote_ = function (string) {
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// Can't use goog.string.quote since % must also be escaped.
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string = string.replace(/\\/g, '\\\\')
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.replace(/\n/g, '\\\n');
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// Follow the CPython behaviour of repr() for a non-byte string.
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var quote = '\'';
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if (string.indexOf('\'') !== -1) {
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if (string.indexOf('"') === -1) {
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quote = '"';
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} else {
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string = string.replace(/'/g, '\\\'');
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}
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}
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return quote + string + quote;
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};
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/**
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* Encode a string as a properly escaped multiline Python string, complete
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* with quotes.
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* @param {string} string Text to encode.
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* @return {string} Python string.
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* @private
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*/
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Python.multiline_quote_ = function (string) {
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// Can't use goog.string.quote since % must also be escaped.
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string = string.replace(/'''/g, '\\\'\\\'\\\'');
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return '\'\'\'' + string + '\'\'\'';
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};
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/**
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* Common tasks for generating Python from blocks.
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* Handles comments for the specified block and any connected value blocks.
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* Calls any statements following this block.
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* @param {!Blockly.Block} block The current block.
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* @param {string} code The Python code created for this block.
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* @param {boolean=} opt_thisOnly True to generate code for only this statement.
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* @return {string} Python code with comments and subsequent blocks added.
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* @private
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*/
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Python.scrub_ = function (block, code, opt_thisOnly) {
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var commentCode = '';
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// Only collect comments for blocks that aren't inline.
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if (!block.outputConnection || !block.outputConnection.targetConnection) {
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// Collect comment for this block.
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var comment = block.getCommentText();
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if (comment) {
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comment = Blockly.utils.string.wrap(comment,
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Python.COMMENT_WRAP - 3);
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commentCode += Python.prefixLines(comment + '\n', '# ');
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}
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// Collect comments for all value arguments.
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// Don't collect comments for nested statements.
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for (var i = 0; i < block.inputList.length; i++) {
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if (block.inputList[i].type == Blockly.INPUT_VALUE) {
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var childBlock = block.inputList[i].connection.targetBlock();
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if (childBlock) {
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var comment = Python.allNestedComments(childBlock);
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if (comment) {
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commentCode += Python.prefixLines(comment, '# ');
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}
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}
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}
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}
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}
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var nextBlock = block.nextConnection && block.nextConnection.targetBlock();
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var nextCode = opt_thisOnly ? '' : Python.blockToCode(nextBlock);
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return commentCode + code + nextCode;
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};
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/**
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* Gets a property and adjusts the value, taking into account indexing, and
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* casts to an integer.
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* @param {!Blockly.Block} block The block.
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* @param {string} atId The property ID of the element to get.
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* @param {number=} opt_delta Value to add.
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* @param {boolean=} opt_negate Whether to negate the value.
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* @return {string|number}
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*/
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Python.getAdjustedInt = function (block, atId, opt_delta, opt_negate) {
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var delta = opt_delta || 0;
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if (block.workspace.options.oneBasedIndex) {
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delta--;
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}
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var defaultAtIndex = block.workspace.options.oneBasedIndex ? '1' : '0';
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var atOrder = delta ? Python.ORDER_ADDITIVE :
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Python.ORDER_NONE;
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var at = Python.valueToCode(block, atId, atOrder) || defaultAtIndex;
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if (Blockly.isNumber(at)) {
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// If the index is a naked number, adjust it right now.
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at = parseInt(at, 10) + delta;
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if (opt_negate) {
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at = -at;
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}
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} else {
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// If the index is dynamic, adjust it in code.
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if (delta > 0) {
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at = 'int(' + at + ' + ' + delta + ')';
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} else if (delta < 0) {
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at = 'int(' + at + ' - ' + -delta + ')';
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} else {
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at = 'int(' + at + ')';
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}
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if (opt_negate) {
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at = '-' + at;
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}
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}
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return at;
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};
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