96 lines
2.4 KiB
JavaScript
96 lines
2.4 KiB
JavaScript
var acornToEsprima = require("./acorn-to-esprima");
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var traverse = require("babel-core").traverse;
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var assign = require("lodash.assign");
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var Module = require("module");
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var acorn = require("babel-core").acorn;
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var path = require("path");
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var t = require("babel-core").types;
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var hasPatched = false;
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function createModule(filename) {
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var mod = new Module(filename);
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mod.filename = filename;
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mod.paths = Module._nodeModulePaths(path.dirname(filename));
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return mod;
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}
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function monkeypatch() {
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if (hasPatched) return;
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hasPatched = true;
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var eslintLoc;
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try {
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eslintLoc = Module._resolveFilename("eslint", module.parent);
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} catch (err) {
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throw new ReferenceError("couldn't resolve eslint");
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}
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// get modules relative to what eslint will load
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var eslintMod = createModule(eslintLoc);
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var escopeLoc = Module._resolveFilename("escope", eslintMod);
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var escopeMod = createModule(escopeLoc);
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// monkeypatch estraverse
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var estraverse = escopeMod.require("estraverse");
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assign(estraverse.VisitorKeys, t.VISITOR_KEYS);
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// monkeypatch escope
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var escope = require(escopeLoc);
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var analyze = escope.analyze;
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escope.analyze = function (ast, opts) {
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opts.ecmaVersion = 6;
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opts.sourceType = "module";
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return analyze.call(this, ast, opts)
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};
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}
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exports.parse = function (code) {
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try {
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monkeypatch();
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} catch (err) {
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console.error(err.stack);
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process.exit(1);
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}
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var opts = {};
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opts.ecmaVersion = 7;
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opts.playground = true;
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opts.locations = true;
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opts.ranges = true;
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var comments = opts.onComment = [];
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var tokens = opts.onToken = [];
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var ast;
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try {
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ast = acorn.parse(code, opts);
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} catch (err) {
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if (err instanceof SyntaxError) {
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err.lineNumber = err.loc.line;
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err.column = err.loc.column;
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// remove trailing "(LINE:COLUMN)" acorn message and add in esprima syntax error message start
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err.message = "Line X: " + err.message.replace(/ \((\d+):(\d+)\)$/, "");
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}
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throw err;
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}
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// remove EOF token, eslint doesn't use this for anything and it interferes with some rules
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// see https://github.com/babel/babel-eslint/issues/2 for more info
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// todo: find a more elegant way to do this
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tokens.pop();
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// convert tokens
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ast.tokens = tokens.map(acornToEsprima.toToken);
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// add comments
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ast.comments = comments;
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// transform esprima and acorn divergent nodes
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acornToEsprima.toAST(ast);
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return ast;
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};
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