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error.js
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error.js
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// @flow
/* eslint sort-keys: "error" */
import { type Position, indexes } from "../util/location";
import CommentsParser from "./comments";
import { type ErrorCode, ErrorCodes } from "./error-codes";
import { type Node } from "../types";
// This function is used to raise exceptions on parse errors. It
// takes an offset integer (into the current `input`) to indicate
// the location of the error, attaches the position to the end
// of the error message, and then raises a `SyntaxError` with that
// message.
type ErrorContext = {
pos: number,
loc: Position,
missingPlugin?: Array<string>,
code?: string,
reasonCode?: String,
};
export type ParsingError = SyntaxError & ErrorContext;
export type ErrorTemplate = {
code: ErrorCode,
template: string,
reasonCode: string,
};
export type ErrorTemplates = {
[key: string]: ErrorTemplate,
};
type Origin = {| node: Node |} | {| at: Position |};
type SyntaxPlugin =
| "flow"
| "typescript"
| "jsx"
| "placeholders"
| typeof undefined;
function keepReasonCodeCompat(reasonCode: string, syntaxPlugin: SyntaxPlugin) {
if (!process.env.BABEL_8_BREAKING) {
// For consistency in TypeScript and Flow error codes
if (syntaxPlugin === "flow" && reasonCode === "PatternIsOptional") {
return "OptionalBindingPattern";
}
}
return reasonCode;
}
export function makeErrorTemplates(
messages: {
[key: string]: string,
},
code: ErrorCode,
syntaxPlugin?: SyntaxPlugin,
): ErrorTemplates {
const templates: ErrorTemplates = {};
Object.keys(messages).forEach(reasonCode => {
templates[reasonCode] = Object.freeze({
code,
reasonCode: keepReasonCodeCompat(reasonCode, syntaxPlugin),
template: messages[reasonCode],
});
});
return Object.freeze(templates);
}
export { ErrorCodes };
export {
ErrorMessages as Errors,
SourceTypeModuleErrorMessages as SourceTypeModuleErrors,
} from "./error-message";
export type raiseFunction = (ErrorTemplate, Origin, ...any) => void;
export type ErrorData = {| message: ErrorTemplate, loc: Position |};
export default class ParserError extends CommentsParser {
// Forward-declaration: defined in tokenizer/index.js
/*::
+isLookahead: boolean;
*/
raise(
{ code, reasonCode, template }: ErrorTemplate,
origin: Origin,
...params: any
): Error | empty {
return this.raiseWithData(
origin.node ? origin.node.loc.start : origin.at,
{ code, reasonCode },
template,
...params,
);
}
/**
* Raise a parsing error on given position pos. If errorRecovery is true,
* it will first search current errors and overwrite the error thrown on the exact
* position before with the new error message. If errorRecovery is false, it
* fallbacks to `raise`.
*
* @param {number} pos
* @param {string} errorTemplate
* @param {...any} params
* @returns {(Error | empty)}
* @memberof ParserError
*/
raiseOverwrite(
loc: Position,
{ code, template }: ErrorTemplate,
...params: any
): Error | empty {
// $FlowIgnore[incompatible-type] We know this exists, so it can't be undefined.
const pos: number = indexes.get(loc);
const message =
template.replace(/%(\d+)/g, (_, i: number) => params[i]) +
` (${loc.line}:${loc.column})`;
if (this.options.errorRecovery) {
const errors = this.state.errors;
for (let i = errors.length - 1; i >= 0; i--) {
const error = errors[i];
if (error.pos === pos) {
return Object.assign(error, { message });
} else if (error.pos < pos) {
break;
}
}
}
return this._raise({ code, loc, pos }, message);
}
raiseWithData(
loc: Position,
data?: {
missingPlugin?: Array<string>,
code?: string,
},
errorTemplate: string,
...params: any
): Error | empty {
const pos = indexes.get(loc);
const message =
errorTemplate.replace(/%(\d+)/g, (_, i: number) => params[i]) +
` (${loc.line}:${loc.column})`;
return this._raise(Object.assign(({ loc, pos }: Object), data), message);
}
_raise(errorContext: ErrorContext, message: string): Error | empty {
// $FlowIgnore
const err: SyntaxError & ErrorContext = new SyntaxError(message);
Object.assign(err, errorContext);
if (this.options.errorRecovery) {
if (!this.isLookahead) this.state.errors.push(err);
return err;
} else {
throw err;
}
}
}