forked from prettier/prettier
/
parser-typescript.js
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/
parser-typescript.js
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"use strict";
const createError = require("../common/parser-create-error");
const includeShebang = require("../common/parser-include-shebang");
const hasPragma = require("./pragma").hasPragma;
const locFns = require("./loc");
function parse(text /*, parsers, opts*/) {
const jsx = isProbablyJsx(text);
let ast;
try {
// Try passing with our best guess first.
ast = tryParseTypeScript(text, jsx);
} catch (firstError) {
try {
// But if we get it wrong, try the opposite.
ast = tryParseTypeScript(text, !jsx);
} catch (secondError) {
// suppose our guess is correct
const e = firstError;
if (typeof e.lineNumber === "undefined") {
throw e;
}
throw createError(e.message, {
start: { line: e.lineNumber, column: e.column + 1 }
});
}
}
delete ast.tokens;
includeShebang(text, ast);
return ast;
}
function tryParseTypeScript(text, jsx) {
const parser = require("typescript-eslint-parser");
return parser.parse(text, {
loc: true,
range: true,
tokens: true,
comment: true,
useJSXTextNode: true,
ecmaFeatures: { jsx },
// Override logger function with noop,
// to avoid unsupported version errors being logged
loggerFn: () => {}
});
}
/**
* Use a naive regular expression to detect JSX
*/
function isProbablyJsx(text) {
return new RegExp(
[
"(^[^\"'`]*</)", // Contains "</" when probably not in a string
"|",
"(^[^/]{2}.*/>)" // Contains "/>" on line not starting with "//"
].join(""),
"m"
).test(text);
}
const parser = Object.assign({ parse, astFormat: "estree", hasPragma }, locFns);
// Export as a plugin so we can reuse the same bundle for UMD loading
module.exports = {
parsers: {
typescript: parser,
"typescript-eslint": parser
}
};