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/**
* @license
* Copyright 2014 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
/**
* @fileoverview Helper functions for generating Dart for blocks.
* @author [email protected] (Neil Fraser)
*/
'use strict';
goog.provide('Blockly.Dart');
goog.require('Blockly.Generator');
goog.require('Blockly.utils.string');
/**
* Dart code generator.
* @type {!Blockly.Generator}
*/
Blockly.Dart = new Blockly.Generator('Dart');
/**
* 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.Dart.addReservedWords(
// https://www.dartlang.org/docs/spec/latest/dart-language-specification.pdf
// Section 16.1.1
'assert,break,case,catch,class,const,continue,default,do,else,enum,' +
'extends,false,final,finally,for,if,in,is,new,null,rethrow,return,super,' +
'switch,this,throw,true,try,var,void,while,with,' +
// https://api.dartlang.org/dart_core.html
'print,identityHashCode,identical,BidirectionalIterator,Comparable,' +
'double,Function,int,Invocation,Iterable,Iterator,List,Map,Match,num,' +
'Pattern,RegExp,Set,StackTrace,String,StringSink,Type,bool,DateTime,' +
'Deprecated,Duration,Expando,Null,Object,RuneIterator,Runes,Stopwatch,' +
'StringBuffer,Symbol,Uri,Comparator,AbstractClassInstantiationError,' +
'ArgumentError,AssertionError,CastError,ConcurrentModificationError,' +
'CyclicInitializationError,Error,Exception,FallThroughError,' +
'FormatException,IntegerDivisionByZeroException,NoSuchMethodError,' +
'NullThrownError,OutOfMemoryError,RangeError,StackOverflowError,' +
'StateError,TypeError,UnimplementedError,UnsupportedError'
);
/**
* Order of operation ENUMs.
* https://www.dartlang.org/docs/dart-up-and-running/ch02.html#operator_table
*/
Blockly.Dart.ORDER_ATOMIC = 0; // 0 "" ...
Blockly.Dart.ORDER_UNARY_POSTFIX = 1; // expr++ expr-- () [] . ?.
Blockly.Dart.ORDER_UNARY_PREFIX = 2; // -expr !expr ~expr ++expr --expr
Blockly.Dart.ORDER_MULTIPLICATIVE = 3; // * / % ~/
Blockly.Dart.ORDER_ADDITIVE = 4; // + -
Blockly.Dart.ORDER_SHIFT = 5; // << >>
Blockly.Dart.ORDER_BITWISE_AND = 6; // &
Blockly.Dart.ORDER_BITWISE_XOR = 7; // ^
Blockly.Dart.ORDER_BITWISE_OR = 8; // |
Blockly.Dart.ORDER_RELATIONAL = 9; // >= > <= < as is is!
Blockly.Dart.ORDER_EQUALITY = 10; // == !=
Blockly.Dart.ORDER_LOGICAL_AND = 11; // &&
Blockly.Dart.ORDER_LOGICAL_OR = 12; // ||
Blockly.Dart.ORDER_IF_NULL = 13; // ??
Blockly.Dart.ORDER_CONDITIONAL = 14; // expr ? expr : expr
Blockly.Dart.ORDER_CASCADE = 15; // ..
Blockly.Dart.ORDER_ASSIGNMENT = 16; // = *= /= ~/= %= += -= <<= >>= &= ^= |=
Blockly.Dart.ORDER_NONE = 99; // (...)
/**
* Initialise the database of variable names.
* @param {!Blockly.Workspace} workspace Workspace to generate code from.
*/
Blockly.Dart.init = function(workspace) {
// Create a dictionary of definitions to be printed before the code.
Blockly.Dart.definitions_ = Object.create(null);
// Create a dictionary mapping desired function names in definitions_
// to actual function names (to avoid collisions with user functions).
Blockly.Dart.functionNames_ = Object.create(null);
if (!Blockly.Dart.variableDB_) {
Blockly.Dart.variableDB_ =
new Blockly.Names(Blockly.Dart.RESERVED_WORDS_);
} else {
Blockly.Dart.variableDB_.reset();
}
Blockly.Dart.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.Dart.variableDB_.getName(devVarList[i],
Blockly.Names.DEVELOPER_VARIABLE_TYPE));
}
// 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.Dart.variableDB_.getName(variables[i].getId(),
Blockly.VARIABLE_CATEGORY_NAME));
}
// Declare all of the variables.
if (defvars.length) {
Blockly.Dart.definitions_['variables'] =
'var ' + defvars.join(', ') + ';';
}
};
/**
* Prepend the generated code with the variable definitions.
* @param {string} code Generated code.
* @return {string} Completed code.
*/
Blockly.Dart.finish = function(code) {
// Indent every line.
if (code) {
code = Blockly.Dart.prefixLines(code, Blockly.Dart.INDENT);
}
code = 'main() {\n' + code + '}';
// Convert the definitions dictionary into a list.
var imports = [];
var definitions = [];
for (var name in Blockly.Dart.definitions_) {
var def = Blockly.Dart.definitions_[name];
if (def.match(/^import\s/)) {
imports.push(def);
} else {
definitions.push(def);
}
}
// Clean up temporary data.
delete Blockly.Dart.definitions_;
delete Blockly.Dart.functionNames_;
Blockly.Dart.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. A trailing semicolon is needed to make this legal.
* @param {string} line Line of generated code.
* @return {string} Legal line of code.
*/
Blockly.Dart.scrubNakedValue = function(line) {
return line + ';\n';
};
/**
* Encode a string as a properly escaped Dart string, complete with quotes.
* @param {string} string Text to encode.
* @return {string} Dart string.
* @private
*/
Blockly.Dart.quote_ = function(string) {
// Can't use goog.string.quote since $ must also be escaped.
string = string.replace(/\\/g, '\\\\')
.replace(/\n/g, '\\\n')
.replace(/\$/g, '\\$')
.replace(/'/g, '\\\'');
return '\'' + string + '\'';
};
/**
* Encode a string as a properly escaped multiline Dart string, complete with
* quotes.
* @param {string} string Text to encode.
* @return {string} Dart string.
* @private
*/
Blockly.Dart.multiline_quote_ = function (string) {
var lines = string.split(/\n/g).map(Blockly.Dart.quote_);
// Join with the following, plus a newline:
// + '\n' +
return lines.join(' + \'\\n\' + \n');
};
/**
* Common tasks for generating Dart 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 Dart code created for this block.
* @param {boolean=} opt_thisOnly True to generate code for only this statement.
* @return {string} Dart code with comments and subsequent blocks added.
* @private
*/
Blockly.Dart.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.Dart.COMMENT_WRAP - 3);
if (block.getProcedureDef) {
// Use documentation comment for function comments.
commentCode += Blockly.Dart.prefixLines(comment + '\n', '/// ');
} else {
commentCode += Blockly.Dart.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.Dart.allNestedComments(childBlock);
if (comment) {
commentCode += Blockly.Dart.prefixLines(comment, '// ');
}
}
}
}
}
var nextBlock = block.nextConnection && block.nextConnection.targetBlock();
var nextCode = opt_thisOnly ? '' : Blockly.Dart.blockToCode(nextBlock);
return commentCode + code + nextCode;
};
/**
* Gets a property and adjusts the value while taking into account indexing.
* @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.
* @param {number=} opt_order The highest order acting on this value.
* @return {string|number}
*/
Blockly.Dart.getAdjusted = function(block, atId, opt_delta, opt_negate,
opt_order) {
var delta = opt_delta || 0;
var order = opt_order || Blockly.Dart.ORDER_NONE;
if (block.workspace.options.oneBasedIndex) {
delta--;
}
var defaultAtIndex = block.workspace.options.oneBasedIndex ? '1' : '0';
if (delta) {
var at = Blockly.Dart.valueToCode(block, atId,
Blockly.Dart.ORDER_ADDITIVE) || defaultAtIndex;
} else if (opt_negate) {
var at = Blockly.Dart.valueToCode(block, atId,
Blockly.Dart.ORDER_UNARY_PREFIX) || defaultAtIndex;
} else {
var at = Blockly.Dart.valueToCode(block, atId, order) ||
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 = at + ' + ' + delta;
var innerOrder = Blockly.Dart.ORDER_ADDITIVE;
} else if (delta < 0) {
at = at + ' - ' + -delta;
var innerOrder = Blockly.Dart.ORDER_ADDITIVE;
}
if (opt_negate) {
if (delta) {
at = '-(' + at + ')';
} else {
at = '-' + at;
}
var innerOrder = Blockly.Dart.ORDER_UNARY_PREFIX;
}
innerOrder = Math.floor(innerOrder);
order = Math.floor(order);
if (innerOrder && order >= innerOrder) {
at = '(' + at + ')';
}
}
return at;
};