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ellen.spertus
252
generators/python/text.js
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252
generators/python/text.js
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/**
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* Visual Blocks Language
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*
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* Copyright 2012 Google Inc.
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* http://blockly.googlecode.com/
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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 Generating Python for text blocks.
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* @author q.neutron@gmail.com (Quynh Neutron)
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*/
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'use strict';
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goog.provide('Blockly.Python.text');
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goog.require('Blockly.Python');
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Blockly.Python['text'] = function(block) {
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// Text value.
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var code = Blockly.Python.quote_(block.getTitleValue('TEXT'));
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return [code, Blockly.Python.ORDER_ATOMIC];
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};
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Blockly.Python['text_join'] = function(block) {
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// Create a string made up of any number of elements of any type.
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//Should we allow joining by '-' or ',' or any other characters?
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var code;
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if (block.itemCount_ == 0) {
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return ['\'\'', Blockly.Python.ORDER_ATOMIC];
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} else if (block.itemCount_ == 1) {
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var argument0 = Blockly.Python.valueToCode(block, 'ADD0',
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Blockly.Python.ORDER_NONE) || '\'\'';
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code = 'str(' + argument0 + ')';
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return [code, Blockly.Python.ORDER_FUNCTION_CALL];
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} else if (block.itemCount_ == 2) {
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var argument0 = Blockly.Python.valueToCode(block, 'ADD0',
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Blockly.Python.ORDER_NONE) || '\'\'';
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var argument1 = Blockly.Python.valueToCode(block, 'ADD1',
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Blockly.Python.ORDER_NONE) || '\'\'';
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var code = 'str(' + argument0 + ') + str(' + argument1 + ')';
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return [code, Blockly.Python.ORDER_UNARY_SIGN];
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} else {
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var code = [];
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for (var n = 0; n < block.itemCount_; n++) {
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code[n] = Blockly.Python.valueToCode(block, 'ADD' + n,
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Blockly.Python.ORDER_NONE) || '\'\'';
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}
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var tempVar = Blockly.Python.variableDB_.getDistinctName('temp_value',
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Blockly.Variables.NAME_TYPE);
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code = '\'\'.join([str(' + tempVar + ') for ' + tempVar + ' in [' +
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code.join(', ') + ']])';
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return [code, Blockly.Python.ORDER_FUNCTION_CALL];
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}
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};
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Blockly.Python['text_append'] = function(block) {
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// Append to a variable in place.
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var varName = Blockly.Python.variableDB_.getName(block.getTitleValue('VAR'),
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Blockly.Variables.NAME_TYPE);
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var argument0 = Blockly.Python.valueToCode(block, 'TEXT',
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Blockly.Python.ORDER_NONE) || '\'\'';
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return varName + ' = str(' + varName + ') + str(' + argument0 + ')\n';
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};
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Blockly.Python['text_length'] = function(block) {
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// String length.
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var argument0 = Blockly.Python.valueToCode(block, 'VALUE',
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Blockly.Python.ORDER_NONE) || '\'\'';
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return ['len(' + argument0 + ')', Blockly.Python.ORDER_FUNCTION_CALL];
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};
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Blockly.Python['text_isEmpty'] = function(block) {
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// Is the string null?
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var argument0 = Blockly.Python.valueToCode(block, 'VALUE',
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Blockly.Python.ORDER_NONE) || '\'\'';
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var code = 'not len(' + argument0 + ')';
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return [code, Blockly.Python.ORDER_LOGICAL_NOT];
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};
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Blockly.Python['text_indexOf'] = function(block) {
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// Search the text for a substring.
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// Should we allow for non-case sensitive???
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var operator = block.getTitleValue('END') == 'FIRST' ? 'find' : 'rfind';
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var argument0 = Blockly.Python.valueToCode(block, 'FIND',
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Blockly.Python.ORDER_NONE) || '\'\'';
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var argument1 = Blockly.Python.valueToCode(block, 'VALUE',
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Blockly.Python.ORDER_MEMBER) || '\'\'';
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var code = argument1 + '.' + operator + '(' + argument0 + ') + 1';
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return [code, Blockly.Python.ORDER_MEMBER];
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};
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Blockly.Python['text_charAt'] = function(block) {
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// Get letter at index.
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// Note: Until January 2013 this block did not have the WHERE input.
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var where = block.getTitleValue('WHERE') || 'FROM_START';
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var at = Blockly.Python.valueToCode(block, 'AT',
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Blockly.Python.ORDER_UNARY_SIGN) || '1';
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var text = Blockly.Python.valueToCode(block, 'VALUE',
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Blockly.Python.ORDER_MEMBER) || '\'\'';
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switch (where) {
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case 'FIRST':
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var code = text + '[0]';
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return [code, Blockly.Python.ORDER_MEMBER];
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case 'LAST':
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var code = text + '[-1]';
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return [code, Blockly.Python.ORDER_MEMBER];
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case 'FROM_START':
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// Blockly uses one-based indicies.
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if (Blockly.isNumber(at)) {
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// If the index is a naked number, decrement it right now.
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at = parseInt(at, 10) - 1;
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} else {
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// If the index is dynamic, decrement it in code.
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at = 'int(' + at + ' - 1)';
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}
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var code = text + '[' + at + ']';
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return [code, Blockly.Python.ORDER_MEMBER];
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case 'FROM_END':
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var code = text + '[-' + at + ']';
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return [code, Blockly.Python.ORDER_MEMBER];
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case 'RANDOM':
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Blockly.Python.definitions_['import_random'] = 'import random';
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var functionName = Blockly.Python.provideFunction_(
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'text_random_letter',
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['def ' + Blockly.Python.FUNCTION_NAME_PLACEHOLDER_ + '(text):',
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' x = int(random.random() * len(text))',
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' return text[x];']);
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code = functionName + '(' + text + ')';
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return [code, Blockly.Python.ORDER_FUNCTION_CALL];
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}
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throw 'Unhandled option (text_charAt).';
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};
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Blockly.Python['text_getSubstring'] = function(block) {
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// Get substring.
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var text = Blockly.Python.valueToCode(block, 'STRING',
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Blockly.Python.ORDER_MEMBER) || '\'\'';
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var where1 = block.getTitleValue('WHERE1');
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var where2 = block.getTitleValue('WHERE2');
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var at1 = Blockly.Python.valueToCode(block, 'AT1',
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Blockly.Python.ORDER_ADDITIVE) || '1';
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var at2 = Blockly.Python.valueToCode(block, 'AT2',
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Blockly.Python.ORDER_ADDITIVE) || '1';
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if (where1 == 'FIRST' || (where1 == 'FROM_START' && at1 == '1')) {
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at1 = '';
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} else if (where1 == 'FROM_START') {
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// Blockly uses one-based indicies.
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if (Blockly.isNumber(at1)) {
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// If the index is a naked number, decrement it right now.
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at1 = parseInt(at1, 10) - 1;
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} else {
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// If the index is dynamic, decrement it in code.
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at1 = 'int(' + at1 + ' - 1)';
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}
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} else if (where1 == 'FROM_END') {
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if (Blockly.isNumber(at1)) {
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at1 = -parseInt(at1, 10);
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} else {
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at1 = '-int(' + at1 + ')';
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}
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}
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if (where2 == 'LAST' || (where2 == 'FROM_END' && at2 == '1')) {
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at2 = '';
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} else if (where1 == 'FROM_START') {
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if (Blockly.isNumber(at2)) {
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at2 = parseInt(at2, 10);
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} else {
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at2 = 'int(' + at2 + ')';
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}
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} else if (where1 == 'FROM_END') {
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if (Blockly.isNumber(at2)) {
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// If the index is a naked number, increment it right now.
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at2 = 1 - parseInt(at2, 10);
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if (at2 == 0) {
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at2 = '';
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}
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} else {
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// If the index is dynamic, increment it in code.
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// Add special case for -0.
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Blockly.Python.definitions_['import_sys'] = 'import sys';
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at2 = 'int(1 - ' + at2 + ') or sys.maxsize';
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}
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}
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var code = text + '[' + at1 + ' : ' + at2 + ']';
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return [code, Blockly.Python.ORDER_MEMBER];
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};
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Blockly.Python['text_changeCase'] = function(block) {
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// Change capitalization.
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var OPERATORS = {
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UPPERCASE: '.upper()',
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LOWERCASE: '.lower()',
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TITLECASE: '.title()'
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};
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var operator = OPERATORS[block.getTitleValue('CASE')];
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var argument0 = Blockly.Python.valueToCode(block, 'TEXT',
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Blockly.Python.ORDER_MEMBER) || '\'\'';
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var code = argument0 + operator;
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return [code, Blockly.Python.ORDER_MEMBER];
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};
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Blockly.Python['text_trim'] = function(block) {
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// Trim spaces.
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var OPERATORS = {
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LEFT: '.lstrip()',
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RIGHT: '.rstrip()',
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BOTH: '.strip()'
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};
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var operator = OPERATORS[block.getTitleValue('MODE')];
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var argument0 = Blockly.Python.valueToCode(block, 'TEXT',
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Blockly.Python.ORDER_MEMBER) || '\'\'';
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var code = argument0 + operator;
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return [code, Blockly.Python.ORDER_MEMBER];
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};
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Blockly.Python['text_print'] = function(block) {
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// Print statement.
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var argument0 = Blockly.Python.valueToCode(block, 'TEXT',
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Blockly.Python.ORDER_NONE) || '\'\'';
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return 'print(' + argument0 + ')\n';
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};
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Blockly.Python['text_prompt'] = function(block) {
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// Prompt function.
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var functionName = Blockly.Python.provideFunction_(
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'text_prompt',
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['def ' + Blockly.Python.FUNCTION_NAME_PLACEHOLDER_ + '(msg):',
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' try:',
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' return raw_input(msg)',
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' except NameError:',
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' return input(msg)']);
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var msg = Blockly.Python.quote_(block.getTitleValue('TEXT'));
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var code = functionName + '(' + msg + ')';
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var toNumber = block.getTitleValue('TYPE') == 'NUMBER';
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if (toNumber) {
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code = 'float(' + code + ')';
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}
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return [code, Blockly.Python.ORDER_FUNCTION_CALL];
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};
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