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-import {has, isArray} from "./util"
-import {SourceLocation} from "./location"
-
-// A second optional argument can be given to further configure
-// the parser process. These options are recognized:
-
-export const defaultOptions = {
- // `ecmaVersion` indicates the ECMAScript version to parse. Must
- // be either 3, or 5, or 6. This influences support for strict
- // mode, the set of reserved words, support for getters and
- // setters and other features.
- ecmaVersion: 5,
- // Source type ("script" or "module") for different semantics
- sourceType: "script",
- // `onInsertedSemicolon` can be a callback that will be called
- // when a semicolon is automatically inserted. It will be passed
- // th position of the comma as an offset, and if `locations` is
- // enabled, it is given the location as a `{line, column}` object
- // as second argument.
- onInsertedSemicolon: null,
- // `onTrailingComma` is similar to `onInsertedSemicolon`, but for
- // trailing commas.
- onTrailingComma: null,
- // By default, reserved words are not enforced. Disable
- // `allowReserved` to enforce them. When this option has the
- // value "never", reserved words and keywords can also not be
- // used as property names.
- allowReserved: true,
- // When enabled, a return at the top level is not considered an
- // error.
- allowReturnOutsideFunction: false,
- // When enabled, import/export statements are not constrained to
- // appearing at the top of the program.
- allowImportExportEverywhere: false,
- // When enabled, hashbang directive in the beginning of file
- // is allowed and treated as a line comment.
- allowHashBang: false,
- // When `locations` is on, `loc` properties holding objects with
- // `start` and `end` properties in `{line, column}` form (with
- // line being 1-based and column 0-based) will be attached to the
- // nodes.
- locations: false,
- // A function can be passed as `onToken` option, which will
- // cause Acorn to call that function with object in the same
- // format as tokenize() returns. Note that you are not
- // allowed to call the parser from the callback—that will
- // corrupt its internal state.
- onToken: null,
- // A function can be passed as `onComment` option, which will
- // cause Acorn to call that function with `(block, text, start,
- // end)` parameters whenever a comment is skipped. `block` is a
- // boolean indicating whether this is a block (`/* */`) comment,
- // `text` is the content of the comment, and `start` and `end` are
- // character offsets that denote the start and end of the comment.
- // When the `locations` option is on, two more parameters are
- // passed, the full `{line, column}` locations of the start and
- // end of the comments. Note that you are not allowed to call the
- // parser from the callback—that will corrupt its internal state.
- onComment: null,
- // Nodes have their start and end characters offsets recorded in
- // `start` and `end` properties (directly on the node, rather than
- // the `loc` object, which holds line/column data. To also add a
- // [semi-standardized][range] `range` property holding a `[start,
- // end]` array with the same numbers, set the `ranges` option to
- // `true`.
- //
- // [range]: https://bugzilla.mozilla.org/show_bug.cgi?id=745678
- ranges: false,
- // It is possible to parse multiple files into a single AST by
- // passing the tree produced by parsing the first file as
- // `program` option in subsequent parses. This will add the
- // toplevel forms of the parsed file to the `Program` (top) node
- // of an existing parse tree.
- program: null,
- // When `locations` is on, you can pass this to record the source
- // file in every node's `loc` object.
- sourceFile: null,
- // This value, if given, is stored in every node, whether
- // `locations` is on or off.
- directSourceFile: null,
- // When enabled, parenthesized expressions are represented by
- // (non-standard) ParenthesizedExpression nodes
- preserveParens: false,
- plugins: {}
-}
-
-// Interpret and default an options object
-
-export function getOptions(opts) {
- let options = {}
- for (let opt in defaultOptions)
- options[opt] = opts && has(opts, opt) ? opts[opt] : defaultOptions[opt]
-
- if (isArray(options.onToken)) {
- let tokens = options.onToken
- options.onToken = (token) => tokens.push(token)
- }
- if (isArray(options.onComment))
- options.onComment = pushComment(options, options.onComment)
-
- return options
-}
-
-function pushComment(options, array) {
- return function (block, text, start, end, startLoc, endLoc) {
- let comment = {
- type: block ? 'Block' : 'Line',
- value: text,
- start: start,
- end: end
- }
- if (options.locations)
- comment.loc = new SourceLocation(this, startLoc, endLoc)
- if (options.ranges)
- comment.range = [start, end]
- array.push(comment)
- }
-}