【WIP】feat: support built-in sql snippets

[JackWang032]

新增功能: #23 支持SQL代码片段

功能描述：对每种语言内置部分常用的SQL片段，在合适的时机可以通过关键字或者空格触发代码片段补全列表

Preview

使用方式：

默认情况下自动启用内置的代码片段，如果自定义了 completionService , 则需要在 completionService 中将 snippets 返回

setupLanguageFeatures(LanguageIdEnum.HIVE, {
	completionItems: {
		enable: true,
              // your own completionService
		completionService
	},
	preprocessCode: (code: string) => preprocessCodeHive(code, '`')
});

需要手动包裹 snippets 补全项并返回

const completionService: CompletionService = async function (
	model,
	_position,
	_completionContext,
	suggestions,
	_entities,
	snippets
) {
	const { keywords, syntax } = suggestions;

	const keywordsCompletionItems: ICompletionItem[] = keywords.map((kw) => ({
		label: kw,
		kind: languages.CompletionItemKind.Keyword,
		detail: '关键字',
		sortText: '2' + kw
	}));

	// wrapped snippets
	const snippetCompletionItems: ICompletionItem[] =
		snippets?.map((item) => ({
			label: item.label || item.prefix,
			kind: languages.CompletionItemKind.Snippet,
			filterText: item.prefix,
			insertText: item.insertText,
			insertTextRules: languages.CompletionItemInsertTextRule.InsertAsSnippet,
			sortText: '1' + item.prefix,
			detail: item.description !== undefined ? item.description : 'SQL模板'
		})) || [];

	return [...keywordsCompletionItems, ...snippetCompletionItems];
};

设置自定义用户片段
snippets 配置参数与 vscode 的 snippet 基本相同, 详见 vscode snippets

setupLanguageFeatures(LanguageIdEnum.HIVE, {
	completionItems: {
		enable: true,
		completionService,
		snippets: [
			{
				label: 'select join',
				prefix: 'SELECT-JOIN',
				body: [
					'SELECT ${8:column1} FROM ${1:table_name} ${2:t1}',
					'${3:LEFT} JOIN ${4:table2} ${5:t2} ON ${2:t1}.${6:column1} = ${5:t2}.${7:column2};\n$9'
				],
				description: 'SQL-Snippet'
			}
		]
	}
});

使用 setupLanguageFeatures 方式配置的 snippets , 只有在当前输入上下文为新语句开头时才能在 completionService 中访问到，如果不需要该特性, 可以直接在 completionService 中使用自己的代码片段列表

[liuxy0551]

ts失败了

[JackWang032]

ts失败了

需要等dt-sql-parser出包

[liuxy0551]

当前文件函数内容缩进异常

[liuxy0551]

当前文件缩进异常