mirror of
https://github.com/google/blockly.git
synced 2026-01-06 08:30:13 +01:00
26901654ea
* refactor(generators): Introduce DartGenerator class, Order enum * refactor(generators): Use Order.* instead of .ORDER_* * refactor(generators): Don't rename dartGenerator
347 lines
11 KiB
JavaScript
347 lines
11 KiB
JavaScript
/**
|
|
* @license
|
|
* Copyright 2014 Google LLC
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*/
|
|
|
|
/**
|
|
* @fileoverview Generating Dart for text blocks.
|
|
*/
|
|
|
|
import * as goog from '../../closure/goog/goog.js';
|
|
goog.declareModuleId('Blockly.Dart.texts');
|
|
|
|
import {NameType} from '../../core/names.js';
|
|
import {dartGenerator, Order} from '../dart.js';
|
|
|
|
|
|
dartGenerator.addReservedWords('Html,Math');
|
|
|
|
dartGenerator.forBlock['text'] = function(block) {
|
|
// Text value.
|
|
const code = dartGenerator.quote_(block.getFieldValue('TEXT'));
|
|
return [code, Order.ATOMIC];
|
|
};
|
|
|
|
dartGenerator.forBlock['text_multiline'] = function(block) {
|
|
// Text value.
|
|
const code = dartGenerator.multiline_quote_(block.getFieldValue('TEXT'));
|
|
const order =
|
|
code.indexOf('+') !== -1 ? Order.ADDITIVE : Order.ATOMIC;
|
|
return [code, order];
|
|
};
|
|
|
|
dartGenerator.forBlock['text_join'] = function(block) {
|
|
// Create a string made up of any number of elements of any type.
|
|
switch (block.itemCount_) {
|
|
case 0:
|
|
return ["''", Order.ATOMIC];
|
|
case 1: {
|
|
const element =
|
|
dartGenerator.valueToCode(block, 'ADD0', Order.UNARY_POSTFIX) || "''";
|
|
const code = element + '.toString()';
|
|
return [code, Order.UNARY_POSTFIX];
|
|
}
|
|
default: {
|
|
const elements = new Array(block.itemCount_);
|
|
for (let i = 0; i < block.itemCount_; i++) {
|
|
elements[i] =
|
|
dartGenerator.valueToCode(block, 'ADD' + i, Order.NONE) || "''";
|
|
}
|
|
const code = '[' + elements.join(',') + '].join()';
|
|
return [code, Order.UNARY_POSTFIX];
|
|
}
|
|
}
|
|
};
|
|
|
|
dartGenerator.forBlock['text_append'] = function(block) {
|
|
// Append to a variable in place.
|
|
const varName =
|
|
dartGenerator.nameDB_.getName(
|
|
block.getFieldValue('VAR'), NameType.VARIABLE);
|
|
const value = dartGenerator.valueToCode(block, 'TEXT', Order.NONE) || "''";
|
|
return varName + ' = [' + varName + ', ' + value + '].join();\n';
|
|
};
|
|
|
|
dartGenerator.forBlock['text_length'] = function(block) {
|
|
// String or array length.
|
|
const text =
|
|
dartGenerator.valueToCode(block, 'VALUE', Order.UNARY_POSTFIX) || "''";
|
|
return [text + '.length', Order.UNARY_POSTFIX];
|
|
};
|
|
|
|
dartGenerator.forBlock['text_isEmpty'] = function(block) {
|
|
// Is the string null or array empty?
|
|
const text =
|
|
dartGenerator.valueToCode(block, 'VALUE', Order.UNARY_POSTFIX) || "''";
|
|
return [text + '.isEmpty', Order.UNARY_POSTFIX];
|
|
};
|
|
|
|
dartGenerator.forBlock['text_indexOf'] = function(block) {
|
|
// Search the text for a substring.
|
|
const operator =
|
|
block.getFieldValue('END') === 'FIRST' ? 'indexOf' : 'lastIndexOf';
|
|
const substring =
|
|
dartGenerator.valueToCode(block, 'FIND', Order.NONE) || "''";
|
|
const text =
|
|
dartGenerator.valueToCode(block, 'VALUE', Order.UNARY_POSTFIX) || "''";
|
|
const code = text + '.' + operator + '(' + substring + ')';
|
|
if (block.workspace.options.oneBasedIndex) {
|
|
return [code + ' + 1', Order.ADDITIVE];
|
|
}
|
|
return [code, Order.UNARY_POSTFIX];
|
|
};
|
|
|
|
dartGenerator.forBlock['text_charAt'] = function(block) {
|
|
// Get letter at index.
|
|
// Note: Until January 2013 this block did not have the WHERE input.
|
|
const where = block.getFieldValue('WHERE') || 'FROM_START';
|
|
const textOrder = (where === 'FIRST' || where === 'FROM_START') ?
|
|
Order.UNARY_POSTFIX :
|
|
Order.NONE;
|
|
const text = dartGenerator.valueToCode(block, 'VALUE', textOrder) || "''";
|
|
let at;
|
|
switch (where) {
|
|
case 'FIRST': {
|
|
const code = text + '[0]';
|
|
return [code, Order.UNARY_POSTFIX];
|
|
}
|
|
case 'FROM_START': {
|
|
at = dartGenerator.getAdjusted(block, 'AT');
|
|
const code = text + '[' + at + ']';
|
|
return [code, Order.UNARY_POSTFIX];
|
|
}
|
|
case 'LAST':
|
|
at = 1;
|
|
// Fall through.
|
|
case 'FROM_END': {
|
|
at = dartGenerator.getAdjusted(block, 'AT', 1);
|
|
const functionName = dartGenerator.provideFunction_('text_get_from_end', `
|
|
String ${dartGenerator.FUNCTION_NAME_PLACEHOLDER_}(String text, num x) {
|
|
return text[text.length - x];
|
|
}
|
|
`);
|
|
const code = functionName + '(' + text + ', ' + at + ')';
|
|
return [code, Order.UNARY_POSTFIX];
|
|
}
|
|
case 'RANDOM': {
|
|
dartGenerator.definitions_['import_dart_math'] =
|
|
'import \'dart:math\' as Math;';
|
|
const functionName =
|
|
dartGenerator.provideFunction_('text_random_letter', `
|
|
String ${dartGenerator.FUNCTION_NAME_PLACEHOLDER_}(String text) {
|
|
int x = new Math.Random().nextInt(text.length);
|
|
return text[x];
|
|
}
|
|
`);
|
|
const code = functionName + '(' + text + ')';
|
|
return [code, Order.UNARY_POSTFIX];
|
|
}
|
|
}
|
|
throw Error('Unhandled option (text_charAt).');
|
|
};
|
|
|
|
dartGenerator.forBlock['text_getSubstring'] = function(block) {
|
|
// Get substring.
|
|
const where1 = block.getFieldValue('WHERE1');
|
|
const where2 = block.getFieldValue('WHERE2');
|
|
const requiresLengthCall = (where1 !== 'FROM_END' && where2 === 'FROM_START');
|
|
const textOrder =
|
|
requiresLengthCall ? Order.UNARY_POSTFIX : Order.NONE;
|
|
const text = dartGenerator.valueToCode(block, 'STRING', textOrder) || "''";
|
|
let code;
|
|
if (where1 === 'FIRST' && where2 === 'LAST') {
|
|
code = text;
|
|
return [code, Order.NONE];
|
|
} else if (text.match(/^'?\w+'?$/) || requiresLengthCall) {
|
|
// If the text is a variable or literal or doesn't require a call for
|
|
// length, don't generate a helper function.
|
|
let at1;
|
|
switch (where1) {
|
|
case 'FROM_START':
|
|
at1 = dartGenerator.getAdjusted(block, 'AT1');
|
|
break;
|
|
case 'FROM_END':
|
|
at1 = dartGenerator.getAdjusted(block, 'AT1', 1, false, Order.ADDITIVE);
|
|
at1 = text + '.length - ' + at1;
|
|
break;
|
|
case 'FIRST':
|
|
at1 = '0';
|
|
break;
|
|
default:
|
|
throw Error('Unhandled option (text_getSubstring).');
|
|
}
|
|
let at2;
|
|
switch (where2) {
|
|
case 'FROM_START':
|
|
at2 = dartGenerator.getAdjusted(block, 'AT2', 1);
|
|
break;
|
|
case 'FROM_END':
|
|
at2 = dartGenerator.getAdjusted(block, 'AT2', 0, false, Order.ADDITIVE);
|
|
at2 = text + '.length - ' + at2;
|
|
break;
|
|
case 'LAST':
|
|
break;
|
|
default:
|
|
throw Error('Unhandled option (text_getSubstring).');
|
|
}
|
|
|
|
if (where2 === 'LAST') {
|
|
code = text + '.substring(' + at1 + ')';
|
|
} else {
|
|
code = text + '.substring(' + at1 + ', ' + at2 + ')';
|
|
}
|
|
} else {
|
|
const at1 = dartGenerator.getAdjusted(block, 'AT1');
|
|
const at2 = dartGenerator.getAdjusted(block, 'AT2');
|
|
const functionName =
|
|
dartGenerator.provideFunction_('text_get_substring', `
|
|
String ${dartGenerator.FUNCTION_NAME_PLACEHOLDER_}(String text, String where1, num at1, String where2, num at2) {
|
|
int getAt(String where, num at) {
|
|
if (where == 'FROM_END') {
|
|
at = text.length - 1 - at;
|
|
} else if (where == 'FIRST') {
|
|
at = 0;
|
|
} else if (where == 'LAST') {
|
|
at = text.length - 1;
|
|
} else if (where != 'FROM_START') {
|
|
throw 'Unhandled option (text_getSubstring).';
|
|
}
|
|
return at;
|
|
}
|
|
at1 = getAt(where1, at1);
|
|
at2 = getAt(where2, at2) + 1;
|
|
return text.substring(at1, at2);
|
|
}
|
|
`);
|
|
code = functionName + '(' + text + ', \'' + where1 + '\', ' + at1 + ', \'' +
|
|
where2 + '\', ' + at2 + ')';
|
|
}
|
|
return [code, Order.UNARY_POSTFIX];
|
|
};
|
|
|
|
dartGenerator.forBlock['text_changeCase'] = function(block) {
|
|
// Change capitalization.
|
|
const OPERATORS = {
|
|
'UPPERCASE': '.toUpperCase()',
|
|
'LOWERCASE': '.toLowerCase()',
|
|
'TITLECASE': null
|
|
};
|
|
const operator = OPERATORS[block.getFieldValue('CASE')];
|
|
const textOrder = operator ? Order.UNARY_POSTFIX : Order.NONE;
|
|
const text = dartGenerator.valueToCode(block, 'TEXT', textOrder) || "''";
|
|
let code;
|
|
if (operator) {
|
|
// Upper and lower case are functions built into dartGenerator.
|
|
code = text + operator;
|
|
} else {
|
|
// Title case is not a native dartGenerator function. Define one.
|
|
const functionName = dartGenerator.provideFunction_('text_toTitleCase', `
|
|
String ${dartGenerator.FUNCTION_NAME_PLACEHOLDER_}(String str) {
|
|
RegExp exp = new RegExp(r'\\b');
|
|
List<String> list = str.split(exp);
|
|
final title = new StringBuffer();
|
|
for (String part in list) {
|
|
if (part.length > 0) {
|
|
title.write(part[0].toUpperCase());
|
|
if (part.length > 0) {
|
|
title.write(part.substring(1).toLowerCase());
|
|
}
|
|
}
|
|
}
|
|
return title.toString();
|
|
}
|
|
`);
|
|
code = functionName + '(' + text + ')';
|
|
}
|
|
return [code, Order.UNARY_POSTFIX];
|
|
};
|
|
|
|
dartGenerator.forBlock['text_trim'] = function(block) {
|
|
// Trim spaces.
|
|
const OPERATORS = {
|
|
'LEFT': '.replaceFirst(new RegExp(r\'^\\s+\'), \'\')',
|
|
'RIGHT': '.replaceFirst(new RegExp(r\'\\s+$\'), \'\')',
|
|
'BOTH': '.trim()'
|
|
};
|
|
const operator = OPERATORS[block.getFieldValue('MODE')];
|
|
const text =
|
|
dartGenerator.valueToCode(block, 'TEXT', Order.UNARY_POSTFIX) || "''";
|
|
return [text + operator, Order.UNARY_POSTFIX];
|
|
};
|
|
|
|
dartGenerator.forBlock['text_print'] = function(block) {
|
|
// Print statement.
|
|
const msg = dartGenerator.valueToCode(block, 'TEXT', Order.NONE) || "''";
|
|
return 'print(' + msg + ');\n';
|
|
};
|
|
|
|
dartGenerator.forBlock['text_prompt_ext'] = function(block) {
|
|
// Prompt function.
|
|
dartGenerator.definitions_['import_dart_html'] =
|
|
'import \'dart:html\' as Html;';
|
|
let msg;
|
|
if (block.getField('TEXT')) {
|
|
// Internal message.
|
|
msg = dartGenerator.quote_(block.getFieldValue('TEXT'));
|
|
} else {
|
|
// External message.
|
|
msg = dartGenerator.valueToCode(block, 'TEXT', Order.NONE) || "''";
|
|
}
|
|
let code = 'Html.window.prompt(' + msg + ', \'\')';
|
|
const toNumber = block.getFieldValue('TYPE') === 'NUMBER';
|
|
if (toNumber) {
|
|
dartGenerator.definitions_['import_dart_math'] =
|
|
'import \'dart:math\' as Math;';
|
|
code = 'Math.parseDouble(' + code + ')';
|
|
}
|
|
return [code, Order.UNARY_POSTFIX];
|
|
};
|
|
|
|
dartGenerator.forBlock['text_prompt'] =
|
|
dartGenerator.forBlock['text_prompt_ext'];
|
|
|
|
dartGenerator.forBlock['text_count'] = function(block) {
|
|
const text = dartGenerator.valueToCode(block, 'TEXT', Order.NONE) || "''";
|
|
const sub = dartGenerator.valueToCode(block, 'SUB', Order.NONE) || "''";
|
|
// Substring count is not a native dartGenerator function. Define one.
|
|
const functionName = dartGenerator.provideFunction_('text_count', `
|
|
int ${dartGenerator.FUNCTION_NAME_PLACEHOLDER_}(String haystack, String needle) {
|
|
if (needle.length == 0) {
|
|
return haystack.length + 1;
|
|
}
|
|
int index = 0;
|
|
int count = 0;
|
|
while (index != -1) {
|
|
index = haystack.indexOf(needle, index);
|
|
if (index != -1) {
|
|
count++;
|
|
index += needle.length;
|
|
}
|
|
}
|
|
return count;
|
|
}
|
|
`);
|
|
const code = functionName + '(' + text + ', ' + sub + ')';
|
|
return [code, Order.UNARY_POSTFIX];
|
|
};
|
|
|
|
dartGenerator.forBlock['text_replace'] = function(block) {
|
|
const text =
|
|
dartGenerator.valueToCode(block, 'TEXT', Order.UNARY_POSTFIX) || "''";
|
|
const from = dartGenerator.valueToCode(block, 'FROM', Order.NONE) || "''";
|
|
const to = dartGenerator.valueToCode(block, 'TO', Order.NONE) || "''";
|
|
const code = text + '.replaceAll(' + from + ', ' + to + ')';
|
|
return [code, Order.UNARY_POSTFIX];
|
|
};
|
|
|
|
dartGenerator.forBlock['text_reverse'] = function(block) {
|
|
// There isn't a sensible way to do this in dartGenerator. See:
|
|
// http://stackoverflow.com/a/21613700/3529104
|
|
// Implementing something is possibly better than not implementing anything?
|
|
const text =
|
|
dartGenerator.valueToCode(block, 'TEXT', Order.UNARY_POSTFIX) || "''";
|
|
const code = 'new String.fromCharCodes(' + text + '.runes.toList().reversed)';
|
|
return [code, Order.UNARY_PREFIX];
|
|
};
|