mirror of
https://github.com/google/blockly.git
synced 2026-01-04 23:50:12 +01:00
68261e5dd9
* feat: add getVariableName and getProcedureName to CodeGenerator * feat: make nameDB_ public * feat: update block code generators to use new APIs * chore: fix build * chore: remove unused imports
343 lines
11 KiB
JavaScript
343 lines
11 KiB
JavaScript
/**
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* @license
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* Copyright 2014 Google LLC
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* @fileoverview Generating Dart for text blocks.
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*/
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// Former goog.module ID: Blockly.Dart.texts
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import {Order} from './dart_generator.js';
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// RESERVED WORDS: 'Html,Math'
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export function text(block, generator) {
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// Text value.
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const code = generator.quote_(block.getFieldValue('TEXT'));
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return [code, Order.ATOMIC];
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};
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export function text_multiline(block, generator) {
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// Text value.
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const code = generator.multiline_quote_(block.getFieldValue('TEXT'));
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const order =
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code.indexOf('+') !== -1 ? Order.ADDITIVE : Order.ATOMIC;
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return [code, order];
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};
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export function text_join(block, generator) {
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// Create a string made up of any number of elements of any type.
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switch (block.itemCount_) {
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case 0:
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return ["''", Order.ATOMIC];
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case 1: {
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const element =
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generator.valueToCode(block, 'ADD0', Order.UNARY_POSTFIX) || "''";
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const code = element + '.toString()';
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return [code, Order.UNARY_POSTFIX];
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}
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default: {
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const elements = new Array(block.itemCount_);
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for (let i = 0; i < block.itemCount_; i++) {
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elements[i] =
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generator.valueToCode(block, 'ADD' + i, Order.NONE) || "''";
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}
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const code = '[' + elements.join(',') + '].join()';
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return [code, Order.UNARY_POSTFIX];
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}
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}
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};
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export function text_append(block, generator) {
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// Append to a variable in place.
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const varName =
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generator.getVariableName(block.getFieldValue('VAR'));
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const value = generator.valueToCode(block, 'TEXT', Order.NONE) || "''";
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return varName + ' = [' + varName + ', ' + value + '].join();\n';
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};
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export function text_length(block, generator) {
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// String or array length.
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const text =
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generator.valueToCode(block, 'VALUE', Order.UNARY_POSTFIX) || "''";
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return [text + '.length', Order.UNARY_POSTFIX];
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};
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export function text_isEmpty(block, generator) {
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// Is the string null or array empty?
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const text =
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generator.valueToCode(block, 'VALUE', Order.UNARY_POSTFIX) || "''";
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return [text + '.isEmpty', Order.UNARY_POSTFIX];
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};
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export function text_indexOf(block, generator) {
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// Search the text for a substring.
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const operator =
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block.getFieldValue('END') === 'FIRST' ? 'indexOf' : 'lastIndexOf';
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const substring =
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generator.valueToCode(block, 'FIND', Order.NONE) || "''";
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const text =
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generator.valueToCode(block, 'VALUE', Order.UNARY_POSTFIX) || "''";
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const code = text + '.' + operator + '(' + substring + ')';
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if (block.workspace.options.oneBasedIndex) {
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return [code + ' + 1', Order.ADDITIVE];
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}
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return [code, Order.UNARY_POSTFIX];
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};
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export function text_charAt(block, generator) {
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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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const where = block.getFieldValue('WHERE') || 'FROM_START';
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const textOrder = (where === 'FIRST' || where === 'FROM_START') ?
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Order.UNARY_POSTFIX :
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Order.NONE;
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const text = generator.valueToCode(block, 'VALUE', textOrder) || "''";
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let at;
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switch (where) {
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case 'FIRST': {
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const code = text + '[0]';
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return [code, Order.UNARY_POSTFIX];
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}
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case 'FROM_START': {
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at = generator.getAdjusted(block, 'AT');
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const code = text + '[' + at + ']';
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return [code, Order.UNARY_POSTFIX];
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}
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case 'LAST':
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at = 1;
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// Fall through.
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case 'FROM_END': {
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at = generator.getAdjusted(block, 'AT', 1);
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const functionName = generator.provideFunction_('text_get_from_end', `
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String ${generator.FUNCTION_NAME_PLACEHOLDER_}(String text, num x) {
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return text[text.length - x];
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}
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`);
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const code = functionName + '(' + text + ', ' + at + ')';
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return [code, Order.UNARY_POSTFIX];
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}
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case 'RANDOM': {
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generator.definitions_['import_dart_math'] =
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'import \'dart:math\' as Math;';
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const functionName =
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generator.provideFunction_('text_random_letter', `
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String ${generator.FUNCTION_NAME_PLACEHOLDER_}(String text) {
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int x = new Math.Random().nextInt(text.length);
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return text[x];
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}
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`);
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const code = functionName + '(' + text + ')';
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return [code, Order.UNARY_POSTFIX];
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}
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}
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throw Error('Unhandled option (text_charAt).');
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};
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export function text_getSubstring(block, generator) {
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// Get substring.
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const where1 = block.getFieldValue('WHERE1');
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const where2 = block.getFieldValue('WHERE2');
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const requiresLengthCall = (where1 !== 'FROM_END' && where2 === 'FROM_START');
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const textOrder =
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requiresLengthCall ? Order.UNARY_POSTFIX : Order.NONE;
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const text = generator.valueToCode(block, 'STRING', textOrder) || "''";
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let code;
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if (where1 === 'FIRST' && where2 === 'LAST') {
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code = text;
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return [code, Order.NONE];
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} else if (text.match(/^'?\w+'?$/) || requiresLengthCall) {
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// If the text is a variable or literal or doesn't require a call for
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// length, don't generate a helper function.
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let at1;
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switch (where1) {
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case 'FROM_START':
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at1 = generator.getAdjusted(block, 'AT1');
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break;
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case 'FROM_END':
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at1 = generator.getAdjusted(block, 'AT1', 1, false, Order.ADDITIVE);
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at1 = text + '.length - ' + at1;
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break;
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case 'FIRST':
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at1 = '0';
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break;
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default:
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throw Error('Unhandled option (text_getSubstring).');
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}
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let at2;
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switch (where2) {
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case 'FROM_START':
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at2 = generator.getAdjusted(block, 'AT2', 1);
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break;
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case 'FROM_END':
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at2 = generator.getAdjusted(block, 'AT2', 0, false, Order.ADDITIVE);
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at2 = text + '.length - ' + at2;
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break;
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case 'LAST':
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break;
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default:
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throw Error('Unhandled option (text_getSubstring).');
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}
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if (where2 === 'LAST') {
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code = text + '.substring(' + at1 + ')';
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} else {
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code = text + '.substring(' + at1 + ', ' + at2 + ')';
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}
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} else {
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const at1 = generator.getAdjusted(block, 'AT1');
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const at2 = generator.getAdjusted(block, 'AT2');
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const functionName =
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generator.provideFunction_('text_get_substring', `
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String ${generator.FUNCTION_NAME_PLACEHOLDER_}(String text, String where1, num at1, String where2, num at2) {
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int getAt(String where, num at) {
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if (where == 'FROM_END') {
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at = text.length - 1 - at;
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} else if (where == 'FIRST') {
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at = 0;
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} else if (where == 'LAST') {
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at = text.length - 1;
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} else if (where != 'FROM_START') {
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throw 'Unhandled option (text_getSubstring).';
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}
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return at;
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}
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at1 = getAt(where1, at1);
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at2 = getAt(where2, at2) + 1;
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return text.substring(at1, at2);
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}
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`);
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code = functionName + '(' + text + ', \'' + where1 + '\', ' + at1 + ', \'' +
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where2 + '\', ' + at2 + ')';
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}
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return [code, Order.UNARY_POSTFIX];
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};
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export function text_changeCase(block, generator) {
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// Change capitalization.
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const OPERATORS = {
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'UPPERCASE': '.toUpperCase()',
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'LOWERCASE': '.toLowerCase()',
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'TITLECASE': null
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};
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const operator = OPERATORS[block.getFieldValue('CASE')];
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const textOrder = operator ? Order.UNARY_POSTFIX : Order.NONE;
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const text = generator.valueToCode(block, 'TEXT', textOrder) || "''";
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let code;
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if (operator) {
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// Upper and lower case are functions built into generator.
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code = text + operator;
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} else {
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// Title case is not a native generator function. Define one.
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const functionName = generator.provideFunction_('text_toTitleCase', `
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String ${generator.FUNCTION_NAME_PLACEHOLDER_}(String str) {
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RegExp exp = new RegExp(r'\\b');
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List<String> list = str.split(exp);
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final title = new StringBuffer();
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for (String part in list) {
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if (part.length > 0) {
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title.write(part[0].toUpperCase());
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if (part.length > 0) {
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title.write(part.substring(1).toLowerCase());
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}
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}
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}
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return title.toString();
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}
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`);
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code = functionName + '(' + text + ')';
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}
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return [code, Order.UNARY_POSTFIX];
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};
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export function text_trim(block, generator) {
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// Trim spaces.
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const OPERATORS = {
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'LEFT': '.replaceFirst(new RegExp(r\'^\\s+\'), \'\')',
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'RIGHT': '.replaceFirst(new RegExp(r\'\\s+$\'), \'\')',
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'BOTH': '.trim()'
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};
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const operator = OPERATORS[block.getFieldValue('MODE')];
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const text =
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generator.valueToCode(block, 'TEXT', Order.UNARY_POSTFIX) || "''";
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return [text + operator, Order.UNARY_POSTFIX];
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};
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export function text_print(block, generator) {
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// Print statement.
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const msg = generator.valueToCode(block, 'TEXT', Order.NONE) || "''";
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return 'print(' + msg + ');\n';
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};
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export function text_prompt_ext(block, generator) {
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// Prompt function.
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generator.definitions_['import_dart_html'] =
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'import \'dart:html\' as Html;';
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let msg;
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if (block.getField('TEXT')) {
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// Internal message.
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msg = generator.quote_(block.getFieldValue('TEXT'));
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} else {
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// External message.
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msg = generator.valueToCode(block, 'TEXT', Order.NONE) || "''";
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}
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let code = 'Html.window.prompt(' + msg + ', \'\')';
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const toNumber = block.getFieldValue('TYPE') === 'NUMBER';
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if (toNumber) {
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generator.definitions_['import_dart_math'] =
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'import \'dart:math\' as Math;';
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code = 'Math.parseDouble(' + code + ')';
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}
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return [code, Order.UNARY_POSTFIX];
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};
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export const text_prompt = text_prompt_ext;
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export function text_count(block, generator) {
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const text = generator.valueToCode(block, 'TEXT', Order.NONE) || "''";
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const sub = generator.valueToCode(block, 'SUB', Order.NONE) || "''";
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// Substring count is not a native generator function. Define one.
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const functionName = generator.provideFunction_('text_count', `
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int ${generator.FUNCTION_NAME_PLACEHOLDER_}(String haystack, String needle) {
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if (needle.length == 0) {
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return haystack.length + 1;
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}
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int index = 0;
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int count = 0;
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while (index != -1) {
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index = haystack.indexOf(needle, index);
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if (index != -1) {
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count++;
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index += needle.length;
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}
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}
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return count;
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}
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`);
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const code = functionName + '(' + text + ', ' + sub + ')';
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return [code, Order.UNARY_POSTFIX];
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};
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export function text_replace(block, generator) {
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const text =
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generator.valueToCode(block, 'TEXT', Order.UNARY_POSTFIX) || "''";
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const from = generator.valueToCode(block, 'FROM', Order.NONE) || "''";
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const to = generator.valueToCode(block, 'TO', Order.NONE) || "''";
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const code = text + '.replaceAll(' + from + ', ' + to + ')';
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return [code, Order.UNARY_POSTFIX];
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};
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export function text_reverse(block, generator) {
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// There isn't a sensible way to do this in generator. See:
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// http://stackoverflow.com/a/21613700/3529104
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// Implementing something is possibly better than not implementing anything?
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const text =
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generator.valueToCode(block, 'TEXT', Order.UNARY_POSTFIX) || "''";
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const code = 'new String.fromCharCodes(' + text + '.runes.toList().reversed)';
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return [code, Order.UNARY_PREFIX];
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};
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