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/**
* @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 text blocks.
* @author rodrigoq@google.com (Rodrigo Queiro)
*/
'use strict';
goog.provide('Blockly.Lua.texts');
goog.require('Blockly.Lua');
Blockly.Lua['text'] = function(block) {
// Text value.
var code = Blockly.Lua.quote_(block.getFieldValue('TEXT'));
return [code, Blockly.Lua.ORDER_ATOMIC];
};
Blockly.Lua['text_join'] = function(block) {
// Create a string made up of any number of elements of any type.
if (block.itemCount_ == 0) {
return ['\'\'', Blockly.Lua.ORDER_ATOMIC];
} else if (block.itemCount_ == 1) {
var element = Blockly.Lua.valueToCode(block, 'ADD0',
Blockly.Lua.ORDER_NONE) || '\'\'';
var code = 'tostring(' + element + ')';
return [code, Blockly.Lua.ORDER_HIGH];
} else if (block.itemCount_ == 2) {
var element0 = Blockly.Lua.valueToCode(block, 'ADD0',
Blockly.Lua.ORDER_CONCATENATION) || '\'\'';
var element1 = Blockly.Lua.valueToCode(block, 'ADD1',
Blockly.Lua.ORDER_CONCATENATION) || '\'\'';
var code = element0 + ' .. ' + element1;
return [code, Blockly.Lua.ORDER_CONCATENATION];
} else {
var elements = [];
for (var i = 0; i < block.itemCount_; i++) {
elements[i] = Blockly.Lua.valueToCode(block, 'ADD' + i,
Blockly.Lua.ORDER_NONE) || '\'\'';
}
var code = 'table.concat({' + elements.join(', ') + '})';
return [code, Blockly.Lua.ORDER_HIGH];
}
};
Blockly.Lua['text_append'] = function(block) {
// Append to a variable in place.
var varName = Blockly.Lua.variableDB_.getName(
block.getFieldValue('VAR'), Blockly.Variables.NAME_TYPE);
var value = Blockly.Lua.valueToCode(block, 'TEXT',
Blockly.Lua.ORDER_CONCATENATION) || '\'\'';
return varName + ' = ' + varName + ' .. ' + value + '\n';
};
Blockly.Lua['text_length'] = function(block) {
// String or array length.
var text = Blockly.Lua.valueToCode(block, 'VALUE',
Blockly.Lua.ORDER_UNARY) || '\'\'';
return ['#' + text, Blockly.Lua.ORDER_UNARY];
};
Blockly.Lua['text_isEmpty'] = function(block) {
// Is the string null or array empty?
var text = Blockly.Lua.valueToCode(block, 'VALUE',
Blockly.Lua.ORDER_UNARY) || '\'\'';
return ['#' + text + ' == 0', Blockly.Lua.ORDER_RELATIONAL];
};
Blockly.Lua['text_indexOf'] = function(block) {
// Search the text for a substring.
var substring = Blockly.Lua.valueToCode(block, 'FIND',
Blockly.Lua.ORDER_NONE) || '\'\'';
var text = Blockly.Lua.valueToCode(block, 'VALUE',
Blockly.Lua.ORDER_NONE) || '\'\'';
if (block.getFieldValue('END') == 'FIRST') {
var functionName = Blockly.Lua.provideFunction_(
'firstIndexOf',
['function ' + Blockly.Lua.FUNCTION_NAME_PLACEHOLDER_ +
'(str, substr) ',
' local i = string.find(str, substr, 1, true)',
' if i == nil then',
' return 0',
' else',
' return i',
' end',
'end']);
} else {
var functionName = Blockly.Lua.provideFunction_(
'lastIndexOf',
['function ' + Blockly.Lua.FUNCTION_NAME_PLACEHOLDER_ +
'(str, substr)',
' local i = string.find(string.reverse(str), ' +
'string.reverse(substr), 1, true)',
' if i then',
' return #str + 2 - i - #substr',
' end',
' return 0',
'end']);
}
var code = functionName + '(' + text + ', ' + substring + ')';
return [code, Blockly.Lua.ORDER_HIGH];
};
Blockly.Lua['text_charAt'] = function(block) {
// Get letter at index.
// Note: Until January 2013 this block did not have the WHERE input.
var where = block.getFieldValue('WHERE') || 'FROM_START';
var atOrder = (where == 'FROM_END') ? Blockly.Lua.ORDER_UNARY :
Blockly.Lua.ORDER_NONE;
var at = Blockly.Lua.valueToCode(block, 'AT', atOrder) || '1';
var text = Blockly.Lua.valueToCode(block, 'VALUE',
Blockly.Lua.ORDER_NONE) || '\'\'';
var code;
if (where == 'RANDOM') {
var functionName = Blockly.Lua.provideFunction_(
'text_random_letter',
['function ' + Blockly.Lua.FUNCTION_NAME_PLACEHOLDER_ + '(str)',
' local index = math.random(string.len(str))',
' return string.sub(str, index, index)',
'end']);
code = functionName + '(' + text + ')';
} else {
if (where == 'FIRST') {
var start = '1';
} else if (where == 'LAST') {
var start = '-1';
} else {
if (where == 'FROM_START') {
var start = at;
} else if (where == 'FROM_END') {
var start = '-' + at;
} else {
throw 'Unhandled option (text_charAt).';
}
}
if (start.match(/^-?\w*$/)) {
code = 'string.sub(' + text + ', ' + start + ', ' + start + ')';
} else {
// use function to avoid reevaluation
var functionName = Blockly.Lua.provideFunction_(
'text_char_at',
['function ' + Blockly.Lua.FUNCTION_NAME_PLACEHOLDER_ +
'(str, index)',
' return string.sub(str, index, index)',
'end']);
code = functionName + '(' + text + ', ' + start + ')';
}
}
return [code, Blockly.Lua.ORDER_HIGH];
};
Blockly.Lua['text_getSubstring'] = function(block) {
// Get substring.
var text = Blockly.Lua.valueToCode(block, 'STRING',
Blockly.Lua.ORDER_NONE) || '\'\'';
// Get start index.
var where1 = block.getFieldValue('WHERE1');
var at1Order = (where1 == 'FROM_END') ? Blockly.Lua.ORDER_UNARY :
Blockly.Lua.ORDER_NONE;
var at1 = Blockly.Lua.valueToCode(block, 'AT1', at1Order) || '1';
if (where1 == 'FIRST') {
var start = 1;
} else if (where1 == 'FROM_START') {
var start = at1;
} else if (where1 == 'FROM_END') {
var start = '-' + at1;
} else {
throw 'Unhandled option (text_getSubstring)';
}
// Get end index.
var where2 = block.getFieldValue('WHERE2');
var at2Order = (where2 == 'FROM_END') ? Blockly.Lua.ORDER_UNARY :
Blockly.Lua.ORDER_NONE;
var at2 = Blockly.Lua.valueToCode(block, 'AT2', at2Order) || '1';
if (where2 == 'LAST') {
var end = -1;
} else if (where2 == 'FROM_START') {
var end = at2;
} else if (where2 == 'FROM_END') {
var end = '-' + at2;
} else {
throw 'Unhandled option (text_getSubstring)';
}
var code = 'string.sub(' + text + ', ' + start + ', ' + end + ')';
return [code, Blockly.Lua.ORDER_HIGH];
};
Blockly.Lua['text_changeCase'] = function(block) {
// Change capitalization.
var operator = block.getFieldValue('CASE');
var text = Blockly.Lua.valueToCode(block, 'TEXT',
Blockly.Lua.ORDER_NONE) || '\'\'';
if (operator == 'UPPERCASE') {
var functionName = 'string.upper';
} else if (operator == 'LOWERCASE') {
var functionName = 'string.lower';
} else if (operator == 'TITLECASE') {
var functionName = Blockly.Lua.provideFunction_(
'text_titlecase',
// There are shorter versions at
// http://lua-users.org/wiki/SciteTitleCase
// that do not preserve whitespace.
['function ' + Blockly.Lua.FUNCTION_NAME_PLACEHOLDER_ + '(str)',
' local buf = {}',
' local inWord = false',
' for i = 1, #str do',
' local c = string.sub(str, i, i)',
' if inWord then',
' table.insert(buf, string.lower(c))',
' if string.find(c, "%s") then',
' inWord = false',
' end',
' else',
' table.insert(buf, string.upper(c))',
' inWord = true',
' end',
' end',
' return table.concat(buf)',
'end']);
}
var code = functionName + '(' + text + ')';
return [code, Blockly.Lua.ORDER_HIGH];
};
Blockly.Lua['text_trim'] = function(block) {
// Trim spaces.
var OPERATORS = {
LEFT: '^%s*(,-)',
RIGHT: '(.-)%s*$',
BOTH: '^%s*(.-)%s*$'
};
var operator = OPERATORS[block.getFieldValue('MODE')];
var text = Blockly.Lua.valueToCode(block, 'TEXT',
Blockly.Lua.ORDER_NONE) || '\'\'';
var code = 'string.gsub(' + text + ', "' + operator + '", "%1")';
return [code, Blockly.Lua.ORDER_HIGH];
};
Blockly.Lua['text_print'] = function(block) {
// Print statement.
var msg = Blockly.Lua.valueToCode(block, 'TEXT',
Blockly.Lua.ORDER_NONE) || '\'\'';
return 'print(' + msg + ')\n';
};
Blockly.Lua['text_prompt_ext'] = function(block) {
// Prompt function.
if (block.getField('TEXT')) {
// Internal message.
var msg = Blockly.Lua.quote_(block.getFieldValue('TEXT'));
} else {
// External message.
var msg = Blockly.Lua.valueToCode(block, 'TEXT',
Blockly.Lua.ORDER_NONE) || '\'\'';
}
var functionName = Blockly.Lua.provideFunction_(
'text_prompt',
['function ' + Blockly.Lua.FUNCTION_NAME_PLACEHOLDER_ + '(msg)',
' io.write(msg)',
' io.flush()',
' return io.read()',
'end']);
var code = functionName + '(' + msg + ')';
var toNumber = block.getFieldValue('TYPE') == 'NUMBER';
if (toNumber) {
code = 'tonumber(' + code + ', 10)';
}
return [code, Blockly.Lua.ORDER_HIGH];
};
Blockly.Lua['text_prompt'] = Blockly.Lua['text_prompt_ext'];
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