mirror of
https://github.com/scratchfoundation/scratch-blocks.git
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290 lines
10 KiB
JavaScript
290 lines
10 KiB
JavaScript
/**
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* @license
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* Visual Blocks Language
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*
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* Copyright 2012 Google Inc.
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* https://developers.google.com/blockly/
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* @fileoverview Helper functions for generating Python for blocks.
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* @author fraser@google.com (Neil Fraser)
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*/
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'use strict';
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goog.provide('Blockly.Python');
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goog.require('Blockly.Generator');
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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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Blockly.Python = new Blockly.Generator('Python');
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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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Blockly.Python.addReservedWords(
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// import keyword
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// print ','.join(keyword.kwlist)
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// http://docs.python.org/reference/lexical_analysis.html#keywords
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'and,as,assert,break,class,continue,def,del,elif,else,except,exec,' +
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'finally,for,from,global,if,import,in,is,lambda,not,or,pass,print,raise,' +
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'return,try,while,with,yield,' +
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//http://docs.python.org/library/constants.html
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'True,False,None,NotImplemented,Ellipsis,__debug__,quit,exit,copyright,' +
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'license,credits,' +
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// http://docs.python.org/library/functions.html
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'abs,divmod,input,open,staticmethod,all,enumerate,int,ord,str,any,eval,' +
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'isinstance,pow,sum,basestring,execfile,issubclass,print,super,bin,file,' +
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'iter,property,tuple,bool,filter,len,range,type,bytearray,float,list,' +
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'raw_input,unichr,callable,format,locals,reduce,unicode,chr,frozenset,' +
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'long,reload,vars,classmethod,getattr,map,repr,xrange,cmp,globals,max,' +
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'reversed,zip,compile,hasattr,memoryview,round,__import__,complex,hash,' +
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'min,set,apply,delattr,help,next,setattr,buffer,dict,hex,object,slice,' +
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'coerce,dir,id,oct,sorted,intern'
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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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Blockly.Python.ORDER_ATOMIC = 0; // 0 "" ...
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Blockly.Python.ORDER_COLLECTION = 1; // tuples, lists, dictionaries
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Blockly.Python.ORDER_STRING_CONVERSION = 1; // `expression...`
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Blockly.Python.ORDER_MEMBER = 2.1; // . []
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Blockly.Python.ORDER_FUNCTION_CALL = 2.2; // ()
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Blockly.Python.ORDER_EXPONENTIATION = 3; // **
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Blockly.Python.ORDER_UNARY_SIGN = 4; // + -
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Blockly.Python.ORDER_BITWISE_NOT = 4; // ~
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Blockly.Python.ORDER_MULTIPLICATIVE = 5; // * / // %
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Blockly.Python.ORDER_ADDITIVE = 6; // + -
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Blockly.Python.ORDER_BITWISE_SHIFT = 7; // << >>
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Blockly.Python.ORDER_BITWISE_AND = 8; // &
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Blockly.Python.ORDER_BITWISE_XOR = 9; // ^
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Blockly.Python.ORDER_BITWISE_OR = 10; // |
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Blockly.Python.ORDER_RELATIONAL = 11; // in, not in, is, is not,
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// <, <=, >, >=, <>, !=, ==
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Blockly.Python.ORDER_LOGICAL_NOT = 12; // not
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Blockly.Python.ORDER_LOGICAL_AND = 13; // and
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Blockly.Python.ORDER_LOGICAL_OR = 14; // or
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Blockly.Python.ORDER_CONDITIONAL = 15; // if else
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Blockly.Python.ORDER_LAMBDA = 16; // lambda
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Blockly.Python.ORDER_NONE = 99; // (...)
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/**
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* Allow for switching between one and zero based indexing for lists and text,
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* one based by default.
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*/
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Blockly.Python.ONE_BASED_INDEXING = true;
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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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Blockly.Python.ORDER_OVERRIDES = [
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// (foo()).bar -> foo().bar
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// (foo())[0] -> foo()[0]
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[Blockly.Python.ORDER_FUNCTION_CALL, Blockly.Python.ORDER_MEMBER],
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// (foo())() -> foo()()
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[Blockly.Python.ORDER_FUNCTION_CALL, Blockly.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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[Blockly.Python.ORDER_MEMBER, Blockly.Python.ORDER_MEMBER],
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// (foo.bar)() -> foo.bar()
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// (foo[0])() -> foo[0]()
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[Blockly.Python.ORDER_MEMBER, Blockly.Python.ORDER_FUNCTION_CALL],
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// not (not foo) -> not not foo
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[Blockly.Python.ORDER_LOGICAL_NOT, Blockly.Python.ORDER_LOGICAL_NOT],
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// a and (b and c) -> a and b and c
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[Blockly.Python.ORDER_LOGICAL_AND, Blockly.Python.ORDER_LOGICAL_AND],
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// a or (b or c) -> a or b or c
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[Blockly.Python.ORDER_LOGICAL_OR, Blockly.Python.ORDER_LOGICAL_OR]
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];
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/**
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* Initialise the database of variable names.
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* @param {!Blockly.Workspace} workspace Workspace to generate code from.
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*/
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Blockly.Python.init = function(workspace) {
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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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Blockly.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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Blockly.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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Blockly.Python.functionNames_ = Object.create(null);
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if (!Blockly.Python.variableDB_) {
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Blockly.Python.variableDB_ =
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new Blockly.Names(Blockly.Python.RESERVED_WORDS_);
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} else {
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Blockly.Python.variableDB_.reset();
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}
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var defvars = [];
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var variables = workspace.variableList;
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for (var i = 0; i < variables.length; i++) {
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defvars[i] = Blockly.Python.variableDB_.getName(variables[i],
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Blockly.Variables.NAME_TYPE) + ' = None';
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}
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Blockly.Python.definitions_['variables'] = defvars.join('\n');
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};
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/**
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* Prepend the generated code with the variable definitions.
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* @param {string} code Generated code.
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* @return {string} Completed code.
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*/
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Blockly.Python.finish = function(code) {
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// Convert the definitions dictionary into a list.
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var imports = [];
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var definitions = [];
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for (var name in Blockly.Python.definitions_) {
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var def = Blockly.Python.definitions_[name];
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if (def.match(/^(from\s+\S+\s+)?import\s+\S+/)) {
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imports.push(def);
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} else {
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definitions.push(def);
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}
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}
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// Clean up temporary data.
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delete Blockly.Python.definitions_;
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delete Blockly.Python.functionNames_;
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Blockly.Python.variableDB_.reset();
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var allDefs = imports.join('\n') + '\n\n' + definitions.join('\n\n');
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return allDefs.replace(/\n\n+/g, '\n\n').replace(/\n*$/, '\n\n\n') + code;
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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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Blockly.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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Blockly.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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.replace(/\%/g, '\\%')
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.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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* @return {string} Python code with comments and subsequent blocks added.
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* @private
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*/
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Blockly.Python.scrub_ = function(block, code) {
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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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comment = Blockly.utils.wrap(comment, Blockly.Python.COMMENT_WRAP - 3);
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if (comment) {
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if (block.getProcedureDef) {
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// Use a comment block for function comments.
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commentCode += '"""' + comment + '\n"""\n';
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} else {
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commentCode += Blockly.Python.prefixLines(comment + '\n', '# ');
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}
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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 = Blockly.Python.allNestedComments(childBlock);
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if (comment) {
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commentCode += Blockly.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 = Blockly.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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Blockly.Python.getAdjustedInt = function(block, atId, opt_delta, opt_negate) {
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var delta = opt_delta || 0;
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if (Blockly.Python.ONE_BASED_INDEXING) {
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delta--;
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}
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var defaultAtIndex = Blockly.Python.ONE_BASED_INDEXING ? '1' : '0';
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var atOrder = delta ? Blockly.Python.ORDER_ADDITIVE :
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Blockly.Python.ORDER_NONE;
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var at = Blockly.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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