1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
|
/**
* @license
* Visual Blocks Language
*
* Copyright 2016 Google Inc.
* https://developers.google.com/blockly/
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @fileoverview Generating Lua for loop blocks.
* @author rodrigoq@google.com (Rodrigo Queiro)
*/
'use strict';
goog.provide('Blockly.Lua.loops');
goog.require('Blockly.Lua');
/**
* This is the text used to implement a <pre>continue</pre>.
* It is also used to recognise <pre>continue</pre>s in generated code so that
* the appropriate label can be put at the end of the loop body.
* @const {string}
*/
Blockly.Lua.CONTINUE_STATEMENT = 'goto continue\n';
/**
* If the loop body contains a "goto continue" statement, add a continue label
* to the loop body. Slightly inefficient, as continue labels will be generated
* in all outer loops, but this is safer than duplicating the logic of
* blockToCode.
*
* @param {string} branch Generated code of the loop body
* @return {string} Generated label or '' if unnecessary
*/
Blockly.Lua.addContinueLabel = function(branch) {
if (branch.indexOf(Blockly.Lua.CONTINUE_STATEMENT) > -1) {
return branch + Blockly.Lua.INDENT + '::continue::\n';
} else {
return branch;
}
};
Blockly.Lua['controls_repeat'] = function(block) {
// Repeat n times (internal number).
var repeats = parseInt(block.getFieldValue('TIMES'), 10);
var branch = Blockly.Lua.statementToCode(block, 'DO') || '';
branch = Blockly.Lua.addContinueLabel(branch);
var loopVar = Blockly.Lua.variableDB_.getDistinctName(
'count', Blockly.Variables.NAME_TYPE);
var code = 'for ' + loopVar + ' = 1, ' + repeats + ' do\n' + branch + 'end\n';
return code;
};
Blockly.Lua['controls_repeat_ext'] = function(block) {
// Repeat n times (external number).
var repeats = Blockly.Lua.valueToCode(block, 'TIMES',
Blockly.Lua.ORDER_NONE) || '0';
if (Blockly.isNumber(repeats)) {
repeats = parseInt(repeats, 10);
} else {
repeats = 'math.floor(' + repeats + ')';
}
var branch = Blockly.Lua.statementToCode(block, 'DO') || '\n';
branch = Blockly.Lua.addContinueLabel(branch);
var loopVar = Blockly.Lua.variableDB_.getDistinctName(
'count', Blockly.Variables.NAME_TYPE);
var code = 'for ' + loopVar + ' = 1, ' + repeats + ' do\n' +
branch + 'end\n';
return code;
};
Blockly.Lua['controls_whileUntil'] = function(block) {
// Do while/until loop.
var until = block.getFieldValue('MODE') == 'UNTIL';
var argument0 = Blockly.Lua.valueToCode(block, 'BOOL',
until ? Blockly.Lua.ORDER_UNARY :
Blockly.Lua.ORDER_NONE) || 'false';
var branch = Blockly.Lua.statementToCode(block, 'DO') || '\n';
branch = Blockly.Lua.addLoopTrap(branch, block.id);
branch = Blockly.Lua.addContinueLabel(branch);
if (until) {
argument0 = 'not ' + argument0;
}
return 'while ' + argument0 + ' do\n' + branch + 'end\n';
};
Blockly.Lua['controls_for'] = function(block) {
// For loop.
var variable0 = Blockly.Lua.variableDB_.getName(
block.getFieldValue('VAR'), Blockly.Variables.NAME_TYPE);
var startVar = Blockly.Lua.valueToCode(block, 'FROM',
Blockly.Lua.ORDER_NONE) || '0';
var endVar = Blockly.Lua.valueToCode(block, 'TO',
Blockly.Lua.ORDER_NONE) || '0';
var increment = Blockly.Lua.valueToCode(block, 'BY',
Blockly.Lua.ORDER_NONE) || '1';
var branch = Blockly.Lua.statementToCode(block, 'DO') || '\n';
branch = Blockly.Lua.addLoopTrap(branch, block.id);
branch = Blockly.Lua.addContinueLabel(branch);
var code = '';
var incValue;
if (Blockly.isNumber(startVar) && Blockly.isNumber(endVar) &&
Blockly.isNumber(increment)) {
// All arguments are simple numbers.
var up = parseFloat(startVar) <= parseFloat(endVar);
var step = Math.abs(parseFloat(increment));
incValue = (up ? '' : '-') + step;
} else {
code = '';
// Determine loop direction at start, in case one of the bounds
// changes during loop execution.
incValue = Blockly.Lua.variableDB_.getDistinctName(
variable0 + '_inc', Blockly.Variables.NAME_TYPE);
code += incValue + ' = ';
if (Blockly.isNumber(increment)) {
code += Math.abs(increment) + '\n';
} else {
code += 'math.abs(' + increment + ')\n';
}
code += 'if (' + startVar + ') > (' + endVar + ') then\n';
code += Blockly.Lua.INDENT + incValue + ' = -' + incValue + '\n';
code += 'end\n';
}
code += 'for ' + variable0 + ' = ' + startVar + ', ' + endVar +
', ' + incValue;
code += ' do\n' + branch + 'end\n';
return code;
};
Blockly.Lua['controls_forEach'] = function(block) {
// For each loop.
var variable0 = Blockly.Lua.variableDB_.getName(
block.getFieldValue('VAR'), Blockly.Variables.NAME_TYPE);
var argument0 = Blockly.Lua.valueToCode(block, 'LIST',
Blockly.Lua.ORDER_NONE) || '{}';
var branch = Blockly.Lua.statementToCode(block, 'DO') || '\n';
branch = Blockly.Lua.addContinueLabel(branch);
var code = 'for _, ' + variable0 + ' in ipairs(' + argument0 + ') do \n' +
branch + 'end\n';
return code;
};
Blockly.Lua['controls_flow_statements'] = function(block) {
// Flow statements: continue, break.
switch (block.getFieldValue('FLOW')) {
case 'BREAK':
return 'break\n';
case 'CONTINUE':
return Blockly.Lua.CONTINUE_STATEMENT;
}
throw 'Unknown flow statement.';
};
|
