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/**
* @license
* Copyright 2012 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
/**
* @fileoverview Helper functions for generating Python for blocks.
* @author [email protected] (Neil Fraser)
*/
'use strict';
goog.provide('Blockly.Python');
goog.require('Blockly.Generator');
goog.require('Blockly.utils.string');
/**
* Python code generator.
* @type {!Blockly.Generator}
*/
Blockly.Python = new Blockly.Generator('Python');
/**
* List of illegal variable names.
* This is not intended to be a security feature. Blockly is 100% client-side,
* so bypassing this list is trivial. This is intended to prevent users from
* accidentally clobbering a built-in object or function.
* @private
*/
Blockly.Python.addReservedWords(
// import keyword
// print(','.join(sorted(keyword.kwlist)))
// https://docs.python.org/3/reference/lexical_analysis.html#keywords
// https://docs.python.org/2/reference/lexical_analysis.html#keywords
'False,None,True,and,as,assert,break,class,continue,def,del,elif,else,' +
'except,exec,finally,for,from,global,if,import,in,is,lambda,nonlocal,not,' +
'or,pass,print,raise,return,try,while,with,yield,' +
// https://docs.python.org/3/library/constants.html
// https://docs.python.org/2/library/constants.html
'NotImplemented,Ellipsis,__debug__,quit,exit,copyright,license,credits,' +
// >>> print(','.join(sorted(dir(__builtins__))))
// https://docs.python.org/3/library/functions.html
// https://docs.python.org/2/library/functions.html
'ArithmeticError,AssertionError,AttributeError,BaseException,' +
'BlockingIOError,BrokenPipeError,BufferError,BytesWarning,' +
'ChildProcessError,ConnectionAbortedError,ConnectionError,' +
'ConnectionRefusedError,ConnectionResetError,DeprecationWarning,EOFError,' +
'Ellipsis,EnvironmentError,Exception,FileExistsError,FileNotFoundError,' +
'FloatingPointError,FutureWarning,GeneratorExit,IOError,ImportError,' +
'ImportWarning,IndentationError,IndexError,InterruptedError,' +
'IsADirectoryError,KeyError,KeyboardInterrupt,LookupError,MemoryError,' +
'ModuleNotFoundError,NameError,NotADirectoryError,NotImplemented,' +
'NotImplementedError,OSError,OverflowError,PendingDeprecationWarning,' +
'PermissionError,ProcessLookupError,RecursionError,ReferenceError,' +
'ResourceWarning,RuntimeError,RuntimeWarning,StandardError,' +
'StopAsyncIteration,StopIteration,SyntaxError,SyntaxWarning,SystemError,' +
'SystemExit,TabError,TimeoutError,TypeError,UnboundLocalError,' +
'UnicodeDecodeError,UnicodeEncodeError,UnicodeError,' +
'UnicodeTranslateError,UnicodeWarning,UserWarning,ValueError,Warning,' +
'ZeroDivisionError,_,__build_class__,__debug__,__doc__,__import__,' +
'__loader__,__name__,__package__,__spec__,abs,all,any,apply,ascii,' +
'basestring,bin,bool,buffer,bytearray,bytes,callable,chr,classmethod,cmp,' +
'coerce,compile,complex,copyright,credits,delattr,dict,dir,divmod,' +
'enumerate,eval,exec,execfile,exit,file,filter,float,format,frozenset,' +
'getattr,globals,hasattr,hash,help,hex,id,input,int,intern,isinstance,' +
'issubclass,iter,len,license,list,locals,long,map,max,memoryview,min,' +
'next,object,oct,open,ord,pow,print,property,quit,range,raw_input,reduce,' +
'reload,repr,reversed,round,set,setattr,slice,sorted,staticmethod,str,' +
'sum,super,tuple,type,unichr,unicode,vars,xrange,zip'
);
/**
* Order of operation ENUMs.
* http://docs.python.org/reference/expressions.html#summary
*/
Blockly.Python.ORDER_ATOMIC = 0; // 0 "" ...
Blockly.Python.ORDER_COLLECTION = 1; // tuples, lists, dictionaries
Blockly.Python.ORDER_STRING_CONVERSION = 1; // `expression...`
Blockly.Python.ORDER_MEMBER = 2.1; // . []
Blockly.Python.ORDER_FUNCTION_CALL = 2.2; // ()
Blockly.Python.ORDER_EXPONENTIATION = 3; // **
Blockly.Python.ORDER_UNARY_SIGN = 4; // + -
Blockly.Python.ORDER_BITWISE_NOT = 4; // ~
Blockly.Python.ORDER_MULTIPLICATIVE = 5; // * / // %
Blockly.Python.ORDER_ADDITIVE = 6; // + -
Blockly.Python.ORDER_BITWISE_SHIFT = 7; // << >>
Blockly.Python.ORDER_BITWISE_AND = 8; // &
Blockly.Python.ORDER_BITWISE_XOR = 9; // ^
Blockly.Python.ORDER_BITWISE_OR = 10; // |
Blockly.Python.ORDER_RELATIONAL = 11; // in, not in, is, is not,
// <, <=, >, >=, <>, !=, ==
Blockly.Python.ORDER_LOGICAL_NOT = 12; // not
Blockly.Python.ORDER_LOGICAL_AND = 13; // and
Blockly.Python.ORDER_LOGICAL_OR = 14; // or
Blockly.Python.ORDER_CONDITIONAL = 15; // if else
Blockly.Python.ORDER_LAMBDA = 16; // lambda
Blockly.Python.ORDER_NONE = 99; // (...)
/**
* List of outer-inner pairings that do NOT require parentheses.
* @type {!Array.<!Array.<number>>}
*/
Blockly.Python.ORDER_OVERRIDES = [
// (foo()).bar -> foo().bar
// (foo())[0] -> foo()[0]
[Blockly.Python.ORDER_FUNCTION_CALL, Blockly.Python.ORDER_MEMBER],
// (foo())() -> foo()()
[Blockly.Python.ORDER_FUNCTION_CALL, Blockly.Python.ORDER_FUNCTION_CALL],
// (foo.bar).baz -> foo.bar.baz
// (foo.bar)[0] -> foo.bar[0]
// (foo[0]).bar -> foo[0].bar
// (foo[0])[1] -> foo[0][1]
[Blockly.Python.ORDER_MEMBER, Blockly.Python.ORDER_MEMBER],
// (foo.bar)() -> foo.bar()
// (foo[0])() -> foo[0]()
[Blockly.Python.ORDER_MEMBER, Blockly.Python.ORDER_FUNCTION_CALL],
// not (not foo) -> not not foo
[Blockly.Python.ORDER_LOGICAL_NOT, Blockly.Python.ORDER_LOGICAL_NOT],
// a and (b and c) -> a and b and c
[Blockly.Python.ORDER_LOGICAL_AND, Blockly.Python.ORDER_LOGICAL_AND],
// a or (b or c) -> a or b or c
[Blockly.Python.ORDER_LOGICAL_OR, Blockly.Python.ORDER_LOGICAL_OR]
];
/**
* Initialise the database of variable names.
* @param {!Blockly.Workspace} workspace Workspace to generate code from.
* @this {Blockly.Generator}
*/
Blockly.Python.init = function(workspace) {
/**
* Empty loops or conditionals are not allowed in Python.
*/
Blockly.Python.PASS = this.INDENT + 'pass\n';
// Create a dictionary of definitions to be printed before the code.
Blockly.Python.definitions_ = Object.create(null);
// Create a dictionary mapping desired function names in definitions_
// to actual function names (to avoid collisions with user functions).
Blockly.Python.functionNames_ = Object.create(null);
if (!Blockly.Python.variableDB_) {
Blockly.Python.variableDB_ =
new Blockly.Names(Blockly.Python.RESERVED_WORDS_);
} else {
Blockly.Python.variableDB_.reset();
}
Blockly.Python.variableDB_.setVariableMap(workspace.getVariableMap());
var defvars = [];
// Add developer variables (not created or named by the user).
var devVarList = Blockly.Variables.allDeveloperVariables(workspace);
for (var i = 0; i < devVarList.length; i++) {
defvars.push(Blockly.Python.variableDB_.getName(devVarList[i],
Blockly.Names.DEVELOPER_VARIABLE_TYPE) + ' = None');
}
// Add user variables, but only ones that are being used.
var variables = Blockly.Variables.allUsedVarModels(workspace);
for (var i = 0; i < variables.length; i++) {
defvars.push(Blockly.Python.variableDB_.getName(variables[i].getId(),
Blockly.VARIABLE_CATEGORY_NAME) + ' = None');
}
Blockly.Python.definitions_['variables'] = defvars.join('\n');
};
/**
* Prepend the generated code with the variable definitions.
* @param {string} code Generated code.
* @return {string} Completed code.
*/
Blockly.Python.finish = function(code) {
// Convert the definitions dictionary into a list.
var imports = [];
var definitions = [];
for (var name in Blockly.Python.definitions_) {
var def = Blockly.Python.definitions_[name];
if (def.match(/^(from\s+\S+\s+)?import\s+\S+/)) {
imports.push(def);
} else {
definitions.push(def);
}
}
// Clean up temporary data.
delete Blockly.Python.definitions_;
delete Blockly.Python.functionNames_;
Blockly.Python.variableDB_.reset();
var allDefs = imports.join('\n') + '\n\n' + definitions.join('\n\n');
return allDefs.replace(/\n\n+/g, '\n\n').replace(/\n*$/, '\n\n\n') + code;
};
/**
* Naked values are top-level blocks with outputs that aren't plugged into
* anything.
* @param {string} line Line of generated code.
* @return {string} Legal line of code.
*/
Blockly.Python.scrubNakedValue = function(line) {
return line + '\n';
};
/**
* Encode a string as a properly escaped Python string, complete with quotes.
* @param {string} string Text to encode.
* @return {string} Python string.
* @private
*/
Blockly.Python.quote_ = function(string) {
// Can't use goog.string.quote since % must also be escaped.
string = string.replace(/\\/g, '\\\\')
.replace(/\n/g, '\\\n');
// Follow the CPython behaviour of repr() for a non-byte string.
var quote = '\'';
if (string.indexOf('\'') !== -1) {
if (string.indexOf('"') === -1) {
quote = '"';
} else {
string = string.replace(/'/g, '\\\'');
}
};
return quote + string + quote;
};
/**
* Encode a string as a properly escaped multiline Python string, complete
* with quotes.
* @param {string} string Text to encode.
* @return {string} Python string.
* @private
*/
Blockly.Python.multiline_quote_ = function(string) {
var lines = string.split(/\n/g).map(Blockly.Python.quote_);
// Join with the following, plus a newline:
// + '\n' +
return lines.join(' + \'\\n\' + \n');
};
/**
* Common tasks for generating Python from blocks.
* Handles comments for the specified block and any connected value blocks.
* Calls any statements following this block.
* @param {!Blockly.Block} block The current block.
* @param {string} code The Python code created for this block.
* @param {boolean=} opt_thisOnly True to generate code for only this statement.
* @return {string} Python code with comments and subsequent blocks added.
* @private
*/
Blockly.Python.scrub_ = function(block, code, opt_thisOnly) {
var commentCode = '';
// Only collect comments for blocks that aren't inline.
if (!block.outputConnection || !block.outputConnection.targetConnection) {
// Collect comment for this block.
var comment = block.getCommentText();
if (comment) {
comment = Blockly.utils.string.wrap(comment,
Blockly.Python.COMMENT_WRAP - 3);
commentCode += Blockly.Python.prefixLines(comment + '\n', '# ');
}
// Collect comments for all value arguments.
// Don't collect comments for nested statements.
for (var i = 0; i < block.inputList.length; i++) {
if (block.inputList[i].type == Blockly.INPUT_VALUE) {
var childBlock = block.inputList[i].connection.targetBlock();
if (childBlock) {
comment = Blockly.Python.allNestedComments(childBlock);
if (comment) {
commentCode += Blockly.Python.prefixLines(comment, '# ');
}
}
}
}
}
var nextBlock = block.nextConnection && block.nextConnection.targetBlock();
var nextCode = opt_thisOnly ? '' : Blockly.Python.blockToCode(nextBlock);
return commentCode + code + nextCode;
};
/**
* Gets a property and adjusts the value, taking into account indexing, and
* casts to an integer.
* @param {!Blockly.Block} block The block.
* @param {string} atId The property ID of the element to get.
* @param {number=} opt_delta Value to add.
* @param {boolean=} opt_negate Whether to negate the value.
* @return {string|number}
*/
Blockly.Python.getAdjustedInt = function(block, atId, opt_delta, opt_negate) {
var delta = opt_delta || 0;
if (block.workspace.options.oneBasedIndex) {
delta--;
}
var defaultAtIndex = block.workspace.options.oneBasedIndex ? '1' : '0';
var atOrder = delta ? Blockly.Python.ORDER_ADDITIVE :
Blockly.Python.ORDER_NONE;
var at = Blockly.Python.valueToCode(block, atId, atOrder) || defaultAtIndex;
if (Blockly.isNumber(at)) {
// If the index is a naked number, adjust it right now.
at = parseInt(at, 10) + delta;
if (opt_negate) {
at = -at;
}
} else {
// If the index is dynamic, adjust it in code.
if (delta > 0) {
at = 'int(' + at + ' + ' + delta + ')';
} else if (delta < 0) {
at = 'int(' + at + ' - ' + -delta + ')';
} else {
at = 'int(' + at + ')';
}
if (opt_negate) {
at = '-' + at;
}
}
return at;
};