blob: 80f327804995ed2e3d470672d1e0de8fdf951139 [file] [log] [blame]
/*---------------------------------------------------------
* Copyright (C) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License. See LICENSE in the project root for license information.
*--------------------------------------------------------*/
'use strict';
import cp = require('child_process');
import path = require('path');
import vscode = require('vscode');
import { toolExecutionEnvironment } from './goEnv';
import { getTextEditForAddImport } from './goImport';
import { promptForMissingTool, promptForUpdatingTool } from './goInstallTools';
import { isModSupported } from './goModules';
import { getImportablePackages, PackageInfo } from './goPackages';
import {
byteOffsetAt,
getBinPath,
getCurrentGoPath,
getGoConfig,
getParametersAndReturnType,
goBuiltinTypes,
goKeywords,
guessPackageNameFromFile,
isPositionInComment,
isPositionInString,
parseFilePrelude,
runGodoc
} from './util';
import { getCurrentGoWorkspaceFromGOPATH } from './utils/goPath';
function vscodeKindFromGoCodeClass(kind: string, type: string): vscode.CompletionItemKind {
switch (kind) {
case 'const':
return vscode.CompletionItemKind.Constant;
case 'package':
return vscode.CompletionItemKind.Module;
case 'type':
switch (type) {
case 'struct':
return vscode.CompletionItemKind.Class;
case 'interface':
return vscode.CompletionItemKind.Interface;
}
return vscode.CompletionItemKind.Struct;
case 'func':
return vscode.CompletionItemKind.Function;
case 'var':
return vscode.CompletionItemKind.Variable;
case 'import':
return vscode.CompletionItemKind.Module;
}
return vscode.CompletionItemKind.Property; // TODO@EG additional mappings needed?
}
interface GoCodeSuggestion {
class: string;
package?: string;
name: string;
type: string;
receiver?: string;
}
class ExtendedCompletionItem extends vscode.CompletionItem {
public package?: string;
public receiver?: string;
public fileName: string;
}
const lineCommentFirstWordRegex = /^\s*\/\/\s+[\S]*$/;
const exportedMemberRegex = /(const|func|type|var)(\s+\(.*\))?\s+([A-Z]\w*)/;
const gocodeNoSupportForgbMsgKey = 'dontshowNoSupportForgb';
export class GoCompletionItemProvider implements vscode.CompletionItemProvider, vscode.Disposable {
private pkgsList = new Map<string, PackageInfo>();
private killMsgShown: boolean = false;
private setGocodeOptions: boolean = true;
private isGoMod: boolean = false;
private globalState: vscode.Memento;
private previousFile: string;
private previousFileDir: string;
private gocodeFlags: string[];
private excludeDocs: boolean = false;
constructor(globalState?: vscode.Memento) {
this.globalState = globalState;
}
public provideCompletionItems(
document: vscode.TextDocument,
position: vscode.Position,
token: vscode.CancellationToken
): Thenable<vscode.CompletionList> {
return this.provideCompletionItemsInternal(document, position, token, getGoConfig(document.uri)).then(
(result) => {
if (!result) {
return new vscode.CompletionList([], false);
}
if (Array.isArray(result)) {
return new vscode.CompletionList(result, false);
}
return result;
}
);
}
public resolveCompletionItem(
item: vscode.CompletionItem,
token: vscode.CancellationToken
): vscode.ProviderResult<vscode.CompletionItem> {
if (
!(item instanceof ExtendedCompletionItem) ||
item.kind === vscode.CompletionItemKind.Module ||
this.excludeDocs
) {
return;
}
if (typeof item.package === 'undefined') {
promptForUpdatingTool('gocode');
return;
}
return runGodoc(
path.dirname(item.fileName),
item.package || path.dirname(item.fileName),
item.receiver,
item.label,
token
)
.then((doc) => {
item.documentation = new vscode.MarkdownString(doc);
return item;
})
.catch((err) => {
console.log(err);
return item;
});
}
public async provideCompletionItemsInternal(
document: vscode.TextDocument,
position: vscode.Position,
token: vscode.CancellationToken,
config: vscode.WorkspaceConfiguration
): Promise<vscode.CompletionItem[] | vscode.CompletionList> {
// Completions for the package statement based on the file name
const pkgStatementCompletions = await getPackageStatementCompletions(document);
if (pkgStatementCompletions && pkgStatementCompletions.length) {
return pkgStatementCompletions;
}
this.excludeDocs = false;
this.gocodeFlags = ['-f=json'];
if (Array.isArray(config['gocodeFlags'])) {
this.gocodeFlags.push(...config['gocodeFlags']);
}
return this.ensureGoCodeConfigured(document.uri, config).then(() => {
return new Promise<vscode.CompletionItem[] | vscode.CompletionList>((resolve, reject) => {
const filename = document.fileName;
const lineText = document.lineAt(position.line).text;
const lineTillCurrentPosition = lineText.substr(0, position.character);
const autocompleteUnimportedPackages =
config['autocompleteUnimportedPackages'] === true && !lineText.match(/^(\s)*(import|package)(\s)+/);
// triggering completions in comments on exported members
const commentCompletion = getCommentCompletion(document, position);
if (commentCompletion) {
return resolve([commentCompletion]);
}
// prevent completion when typing in a line comment that doesnt start from the beginning of the line
if (isPositionInComment(document, position)) {
return resolve([]);
}
const inString = isPositionInString(document, position);
if (!inString && lineTillCurrentPosition.endsWith('"')) {
return resolve([]);
}
const currentWord = getCurrentWord(document, position);
if (currentWord.match(/^\d+$/)) {
return resolve([]);
}
let offset = byteOffsetAt(document, position);
let inputText = document.getText();
const includeUnimportedPkgs = autocompleteUnimportedPackages && !inString && currentWord.length > 0;
return this.runGoCode(
document,
filename,
inputText,
offset,
inString,
position,
lineText,
currentWord,
includeUnimportedPkgs,
config
).then((suggestions) => {
// gocode does not suggest keywords, so we have to do it
suggestions.push(...getKeywordCompletions(currentWord));
// If no suggestions and cursor is at a dot, then check if preceeding word is a package name
// If yes, then import the package in the inputText and run gocode again to get suggestions
if ((!suggestions || suggestions.length === 0) && lineTillCurrentPosition.endsWith('.')) {
const pkgPath = this.getPackagePathFromLine(lineTillCurrentPosition);
if (pkgPath.length === 1) {
// Now that we have the package path, import it right after the "package" statement
const { imports, pkg } = parseFilePrelude(
vscode.window.activeTextEditor.document.getText()
);
const posToAddImport = document.offsetAt(new vscode.Position(pkg.start + 1, 0));
const textToAdd = `import "${pkgPath[0]}"\n`;
inputText =
inputText.substr(0, posToAddImport) + textToAdd + inputText.substr(posToAddImport);
offset += textToAdd.length;
// Now that we have the package imported in the inputText, run gocode again
return this.runGoCode(
document,
filename,
inputText,
offset,
inString,
position,
lineText,
currentWord,
false,
config
).then((newsuggestions) => {
// Since the new suggestions are due to the package that we imported,
// add additionalTextEdits to do the same in the actual document in the editor
// We use additionalTextEdits instead of command so that 'useCodeSnippetsOnFunctionSuggest'
// feature continues to work
newsuggestions.forEach((item) => {
item.additionalTextEdits = getTextEditForAddImport(pkgPath[0]);
});
resolve(newsuggestions);
}, reject);
}
if (pkgPath.length > 1) {
pkgPath.forEach((pkg) => {
const item = new vscode.CompletionItem(
`${lineTillCurrentPosition.replace('.', '').trim()} (${pkg})`,
vscode.CompletionItemKind.Module
);
item.additionalTextEdits = getTextEditForAddImport(pkg);
item.insertText = '';
item.detail = pkg;
item.command = {
title: 'Trigger Suggest',
command: 'editor.action.triggerSuggest'
};
suggestions.push(item);
});
resolve(new vscode.CompletionList(suggestions, true));
}
}
resolve(suggestions);
}, reject);
});
});
}
public dispose() {
const gocodeName = this.isGoMod ? 'gocode-gomod' : 'gocode';
const gocode = getBinPath(gocodeName);
if (path.isAbsolute(gocode)) {
cp.spawn(gocode, ['close'], { env: toolExecutionEnvironment() });
}
}
private runGoCode(
document: vscode.TextDocument,
filename: string,
inputText: string,
offset: number,
inString: boolean,
position: vscode.Position,
lineText: string,
currentWord: string,
includeUnimportedPkgs: boolean,
config: vscode.WorkspaceConfiguration
): Thenable<vscode.CompletionItem[]> {
return new Promise<vscode.CompletionItem[]>((resolve, reject) => {
const gocodeName = this.isGoMod ? 'gocode-gomod' : 'gocode';
const gocode = getBinPath(gocodeName);
if (!path.isAbsolute(gocode)) {
promptForMissingTool(gocodeName);
return reject();
}
const env = toolExecutionEnvironment();
let stdout = '';
let stderr = '';
// stamblerre/gocode does not support -unimported-packages flags.
if (this.isGoMod) {
const unimportedPkgIndex = this.gocodeFlags.indexOf('-unimported-packages');
if (unimportedPkgIndex >= 0) {
this.gocodeFlags.splice(unimportedPkgIndex, 1);
}
}
// -exclude-docs is something we use internally and is not related to gocode
const excludeDocsIndex = this.gocodeFlags.indexOf('-exclude-docs');
if (excludeDocsIndex >= 0) {
this.gocodeFlags.splice(excludeDocsIndex, 1);
this.excludeDocs = true;
}
// Spawn `gocode` process
const p = cp.spawn(gocode, [...this.gocodeFlags, 'autocomplete', filename, '' + offset], { env });
p.stdout.on('data', (data) => (stdout += data));
p.stderr.on('data', (data) => (stderr += data));
p.on('error', (err) => {
if (err && (<any>err).code === 'ENOENT') {
promptForMissingTool(gocodeName);
return reject();
}
return reject(err);
});
p.on('close', (code) => {
try {
if (code !== 0) {
if (stderr.indexOf(`rpc: can't find service Server.AutoComplete`) > -1 && !this.killMsgShown) {
vscode.window.showErrorMessage(
'Auto-completion feature failed as an older gocode process is still running. Please kill the running process for gocode and try again.'
);
this.killMsgShown = true;
}
if (stderr.startsWith('flag provided but not defined:')) {
promptForUpdatingTool(gocodeName);
}
return reject();
}
const results = <[number, GoCodeSuggestion[]]>JSON.parse(stdout.toString());
let suggestions: vscode.CompletionItem[] = [];
const packageSuggestions: string[] = [];
const wordAtPosition = document.getWordRangeAtPosition(position);
let areCompletionsForPackageSymbols = false;
if (results && results[1]) {
for (const suggest of results[1]) {
if (inString && suggest.class !== 'import') {
continue;
}
const item = new ExtendedCompletionItem(suggest.name);
item.kind = vscodeKindFromGoCodeClass(suggest.class, suggest.type);
item.package = suggest.package;
item.receiver = suggest.receiver;
item.fileName = document.fileName;
item.detail = suggest.type;
if (!areCompletionsForPackageSymbols && item.package && item.package !== 'builtin') {
areCompletionsForPackageSymbols = true;
}
if (suggest.class === 'package') {
const possiblePackageImportPaths = this.getPackageImportPath(item.label);
if (possiblePackageImportPaths.length === 1) {
item.detail = possiblePackageImportPaths[0];
}
packageSuggestions.push(suggest.name);
}
if (inString && suggest.class === 'import') {
item.textEdit = new vscode.TextEdit(
new vscode.Range(
position.line,
lineText.substring(0, position.character).lastIndexOf('"') + 1,
position.line,
position.character
),
suggest.name
);
}
if (
(config['useCodeSnippetsOnFunctionSuggest'] ||
config['useCodeSnippetsOnFunctionSuggestWithoutType']) &&
((suggest.class === 'func' && lineText.substr(position.character, 2) !== '()') || // Avoids met() -> method()()
(suggest.class === 'var' &&
suggest.type.startsWith('func(') &&
lineText.substr(position.character, 1) !== ')' && // Avoids snippets when typing params in a func call
lineText.substr(position.character, 1) !== ',')) // Avoids snippets when typing params in a func call
) {
const { params, returnType } = getParametersAndReturnType(suggest.type.substring(4));
const paramSnippets = [];
for (let i = 0; i < params.length; i++) {
let param = params[i].trim();
if (param) {
param = param.replace('${', '\\${').replace('}', '\\}');
if (config['useCodeSnippetsOnFunctionSuggestWithoutType']) {
if (param.includes(' ')) {
// Separate the variable name from the type
param = param.substr(0, param.indexOf(' '));
}
}
paramSnippets.push('${' + (i + 1) + ':' + param + '}');
}
}
item.insertText = new vscode.SnippetString(
suggest.name + '(' + paramSnippets.join(', ') + ')'
);
}
if (
config['useCodeSnippetsOnFunctionSuggest'] &&
suggest.class === 'type' &&
suggest.type.startsWith('func(')
) {
const { params, returnType } = getParametersAndReturnType(suggest.type.substring(4));
const paramSnippets = [];
for (let i = 0; i < params.length; i++) {
let param = params[i].trim();
if (param) {
param = param.replace('${', '\\${').replace('}', '\\}');
if (!param.includes(' ')) {
// If we don't have an argument name, we need to create one
param = 'arg' + (i + 1) + ' ' + param;
}
const arg = param.substr(0, param.indexOf(' '));
paramSnippets.push(
'${' +
(i + 1) +
':' +
arg +
'}' +
param.substr(param.indexOf(' '), param.length)
);
}
}
item.insertText = new vscode.SnippetString(
suggest.name +
'(func(' +
paramSnippets.join(', ') +
') {\n $' +
(params.length + 1) +
'\n})' +
returnType
);
}
if (
wordAtPosition &&
wordAtPosition.start.character === 0 &&
suggest.class === 'type' &&
!goBuiltinTypes.has(suggest.name)
) {
const auxItem = new vscode.CompletionItem(
suggest.name + ' method',
vscode.CompletionItemKind.Snippet
);
auxItem.label = 'func (*' + suggest.name + ')';
auxItem.filterText = suggest.name;
auxItem.detail = 'Method snippet';
auxItem.sortText = 'b';
const prefix = 'func (' + suggest.name[0].toLowerCase() + ' *' + suggest.name + ')';
const snippet = prefix + ' ${1:methodName}(${2}) ${3} {\n\t$0\n}';
auxItem.insertText = new vscode.SnippetString(snippet);
suggestions.push(auxItem);
}
// Add same sortText to all suggestions from gocode so that they appear before the unimported packages
item.sortText = 'a';
suggestions.push(item);
}
}
// Add importable packages matching currentword to suggestions
if (includeUnimportedPkgs && !this.isGoMod && !areCompletionsForPackageSymbols) {
suggestions = suggestions.concat(
getPackageCompletions(document, currentWord, this.pkgsList, packageSuggestions)
);
}
resolve(suggestions);
} catch (e) {
reject(e);
}
});
if (p.pid) {
p.stdin.end(inputText);
}
});
}
// TODO: Shouldn't lib-path also be set?
private ensureGoCodeConfigured(fileuri: vscode.Uri, goConfig: vscode.WorkspaceConfiguration): Thenable<void> {
const currentFile = fileuri.fsPath;
let checkModSupport = Promise.resolve(this.isGoMod);
if (this.previousFile !== currentFile && this.previousFileDir !== path.dirname(currentFile)) {
this.previousFile = currentFile;
this.previousFileDir = path.dirname(currentFile);
checkModSupport = isModSupported(fileuri).then((result) => (this.isGoMod = result));
}
const setPkgsList = getImportablePackages(currentFile, true).then((pkgMap) => {
this.pkgsList = pkgMap;
});
if (!this.setGocodeOptions) {
return Promise.all([checkModSupport, setPkgsList]).then(() => {
return;
});
}
const setGocodeProps = new Promise<void>((resolve, reject) => {
const gocode = getBinPath('gocode');
const env = toolExecutionEnvironment();
cp.execFile(gocode, ['set'], { env }, (err, stdout, stderr) => {
if (err && stdout.startsWith('gocode: unknown subcommand:')) {
if (
goConfig['gocodePackageLookupMode'] === 'gb' &&
this.globalState &&
!this.globalState.get(gocodeNoSupportForgbMsgKey)
) {
vscode.window
.showInformationMessage(
'The go.gocodePackageLookupMode setting for gb will not be honored as github.com/mdempskey/gocode doesnt support it yet.',
`Don't show again`
)
.then((selected) => {
if (selected === `Don't show again`) {
this.globalState.update(gocodeNoSupportForgbMsgKey, true);
}
});
}
this.setGocodeOptions = false;
return resolve();
}
const existingOptions = stdout.split(/\r\n|\n/);
const optionsToSet: string[][] = [];
const setOption = () => {
const [name, value] = optionsToSet.pop();
cp.execFile(gocode, ['set', name, value], { env }, () => {
if (optionsToSet.length) {
setOption();
} else {
resolve();
}
});
};
if (existingOptions.indexOf('propose-builtins true') === -1) {
optionsToSet.push(['propose-builtins', 'true']);
}
if (existingOptions.indexOf(`autobuild ${goConfig['gocodeAutoBuild']}`) === -1) {
optionsToSet.push(['autobuild', goConfig['gocodeAutoBuild']]);
}
if (existingOptions.indexOf(`package-lookup-mode ${goConfig['gocodePackageLookupMode']}`) === -1) {
optionsToSet.push(['package-lookup-mode', goConfig['gocodePackageLookupMode']]);
}
if (!optionsToSet.length) {
return resolve();
}
setOption();
});
});
return Promise.all([setPkgsList, setGocodeProps, checkModSupport]).then(() => {
return;
});
}
// Given a line ending with dot, return the import paths of packages that match with the word preceeding the dot
private getPackagePathFromLine(line: string): string[] {
const pattern = /(\w+)\.$/g;
const wordmatches = pattern.exec(line);
if (!wordmatches) {
return [];
}
const [_, pkgNameFromWord] = wordmatches;
// Word is isolated. Now check pkgsList for a match
return this.getPackageImportPath(pkgNameFromWord);
}
/**
* Returns import path for given package. Since there can be multiple matches,
* this returns an array of matches
* @param input Package name
*/
private getPackageImportPath(input: string): string[] {
const matchingPackages: any[] = [];
this.pkgsList.forEach((info: PackageInfo, pkgPath: string) => {
if (input === info.name) {
matchingPackages.push(pkgPath);
}
});
return matchingPackages;
}
}
/**
* Provides completion item for the exported member in the next line if current line is a comment
* @param document The current document
* @param position The cursor position
*/
function getCommentCompletion(document: vscode.TextDocument, position: vscode.Position): vscode.CompletionItem {
const lineText = document.lineAt(position.line).text;
const lineTillCurrentPosition = lineText.substr(0, position.character);
// triggering completions in comments on exported members
if (lineCommentFirstWordRegex.test(lineTillCurrentPosition) && position.line + 1 < document.lineCount) {
const nextLine = document.lineAt(position.line + 1).text.trim();
const memberType = nextLine.match(exportedMemberRegex);
let suggestionItem: vscode.CompletionItem;
if (memberType && memberType.length === 4) {
suggestionItem = new vscode.CompletionItem(memberType[3], vscodeKindFromGoCodeClass(memberType[1], ''));
}
return suggestionItem;
}
}
function getCurrentWord(document: vscode.TextDocument, position: vscode.Position): string {
// get current word
const wordAtPosition = document.getWordRangeAtPosition(position);
let currentWord = '';
if (wordAtPosition && wordAtPosition.start.character < position.character) {
const word = document.getText(wordAtPosition);
currentWord = word.substr(0, position.character - wordAtPosition.start.character);
}
return currentWord;
}
function getKeywordCompletions(currentWord: string): vscode.CompletionItem[] {
if (!currentWord.length) {
return [];
}
const completionItems: vscode.CompletionItem[] = [];
goKeywords.forEach((keyword) => {
if (keyword.startsWith(currentWord)) {
completionItems.push(new vscode.CompletionItem(keyword, vscode.CompletionItemKind.Keyword));
}
});
return completionItems;
}
/**
* Return importable packages that match given word as Completion Items
* @param document Current document
* @param currentWord The word at the cursor
* @param allPkgMap Map of all available packages and their import paths
* @param importedPackages List of imported packages. Used to prune imported packages out of available packages
*/
function getPackageCompletions(
document: vscode.TextDocument,
currentWord: string,
allPkgMap: Map<string, PackageInfo>,
importedPackages: string[] = []
): vscode.CompletionItem[] {
const cwd = path.dirname(document.fileName);
const goWorkSpace = getCurrentGoWorkspaceFromGOPATH(getCurrentGoPath(), cwd);
const workSpaceFolder = vscode.workspace.getWorkspaceFolder(document.uri);
const currentPkgRootPath = (workSpaceFolder ? workSpaceFolder.uri.path : cwd).slice(goWorkSpace.length + 1);
const completionItems: any[] = [];
allPkgMap.forEach((info: PackageInfo, pkgPath: string) => {
const pkgName = info.name;
if (pkgName.startsWith(currentWord) && importedPackages.indexOf(pkgName) === -1) {
const item = new vscode.CompletionItem(pkgName, vscode.CompletionItemKind.Keyword);
item.detail = pkgPath;
item.documentation = 'Imports the package';
item.insertText = pkgName;
item.command = {
title: 'Import Package',
command: 'go.import.add',
arguments: [{ importPath: pkgPath, from: 'completion' }]
};
item.kind = vscode.CompletionItemKind.Module;
// Unimported packages should appear after the suggestions from gocode
const isStandardPackage = !item.detail.includes('.');
item.sortText = isStandardPackage ? 'za' : pkgPath.startsWith(currentPkgRootPath) ? 'zb' : 'zc';
completionItems.push(item);
}
});
return completionItems;
}
async function getPackageStatementCompletions(document: vscode.TextDocument): Promise<vscode.CompletionItem[]> {
// 'Smart Snippet' for package clause
const inputText = document.getText();
if (inputText.match(/package\s+(\w+)/)) {
return [];
}
const pkgNames = await guessPackageNameFromFile(document.fileName);
const suggestions = pkgNames.map((pkgName) => {
const packageItem = new vscode.CompletionItem('package ' + pkgName);
packageItem.kind = vscode.CompletionItemKind.Snippet;
packageItem.insertText = 'package ' + pkgName + '\r\n\r\n';
return packageItem;
});
return suggestions;
}