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worker.ts
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worker.ts
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import * as ts from 'typescript';
var scriptName = 'script.ts';
class CheckerCompilerHost implements ts.CompilerHost {
files: { [fileName: string]: string } = {}
getSourceFile(filename: string, languageVersion: ts.ScriptTarget, onError?: (message: string) => void): ts.SourceFile {
var text = this.files[filename];
if (!text) return null;
return ts.createSourceFile(filename, text, languageVersion);
}
getDefaultLibFileName = (options: ts.CompilerOptions) => 'lib.d.ts';
getDirectories = (path: string) => [];
writeFile(filename: string, data: string, writeByteOrderMark: boolean, onError?: (message: string) => void): void {
}
getCurrentDirectory = () => "";
getCanonicalFileName = (fileName: string) => fileName;
useCaseSensitiveFileNames = () => true;
getNewLine = () => "\n";
fileExists = (fileName: string) => !!this.files[fileName];
readFile = (fileName: string) => this.files[fileName];
addFile(fileName: string, body: string) {
this.files[fileName] = body;
}
}
const findNode = (n: ts.Node, f: (testNode: ts.Node) => Boolean) => {
let result : ts.Node;
function findNode(nn: ts.Node) {
if (result) {
return;
}
if (f(nn)) {
result = nn;
return;
}
ts.forEachChild(nn, findNode);
}
findNode(n);
return result;
}
export class Checker {
files: { [fileName: string]: string; } = {}
private compilerHost = new CheckerCompilerHost();
init(callback: () => void) {
var xhr = new XMLHttpRequest();
xhr.onload = ev => {
var response = xhr.responseText;
this.files["lib.d.ts"] = response;
this.compilerHost.addFile("lib.d.ts", this.files["lib.d.ts"]);
callback();
};
xhr.open("GET", "lib.d.ts");
xhr.send();
}
initHost(input: string) {
this.compilerHost.addFile(scriptName, input);
}
compilerOptions(): ts.CompilerOptions {
var settings = ts.getDefaultCompilerOptions();
settings.diagnostics = true;
settings.skipLibCheck = true;
return settings;
}
checkExpression(s: string) {
var input = "var expr = (" + s + ");";
this.initHost(input);
var program = ts.createProgram([scriptName], this.compilerOptions(), this.compilerHost);
var typeChecker = program.getTypeChecker();
var sf = program.getSourceFile(scriptName);
var diagnostics = [].concat(
program.getGlobalDiagnostics(),
program.getSyntacticDiagnostics(sf),
program.getSemanticDiagnostics(sf)
);
if (diagnostics.length > 0) {
var result = diagnostics.map(d => d.messageText).join("\n");
return { error: true, output: result, type: null };
} else {
console.log(typeChecker.getSymbolsInScope(sf, ts.SymbolFlags.Variable)[0]);
const node = findNode(sf, (n: ts.Node) => n.kind === ts.SyntaxKind.VariableDeclaration);
return {
error: false,
type: typeChecker.typeToString(typeChecker.getTypeAtLocation(node))
};
}
}
checkStatements(s: string) {
this.initHost(s);
var program = ts.createProgram([scriptName], this.compilerOptions(), this.compilerHost);
var typeChecker = program.getTypeChecker();
var sf = program.getSourceFile(scriptName);
var diagnostics = program.getSemanticDiagnostics(sf);
// typeChecker.getDiagnostics(sf);
var nodes: ts.Node[] = [];
function allNodes(n) {
ts.forEachChild(n, n => { nodes.push(n); allNodes(n); return false; })
};
allNodes(sf);
var idNodes = nodes.filter(n => n.kind === ts.SyntaxKind.Identifier);
var typed = idNodes.map(n => {
var type = typeChecker.getTypeAtLocation(n);
return {
pos: { start: n.pos, length: n.end - n.pos },
type: {
fullSymbolName: n.getText(),
kind: type.flags,
memberName: typeChecker.typeToString(type)
}
};
});
return typed;
}
}
var checker = new Checker();
checker.init(() => {
postMessage("ready");
});
onmessage = args => {
var data = args.data, result;
if (data.sort === 'expr') {
result = checker.checkExpression(data.text);
} else {
result = checker.checkStatements(data.text)
}
postMessage({ res: result, id: data.id, sort: data.sort });
};