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import {has, isArray} from "./util"
import {SourceLocation} from "./locutil"
// 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, 5, 6 (2015), 7 (2016), or 8 (2017). This influences support
// for strict mode, the set of reserved words, and support for
// new syntax features. The default is 7.
ecmaVersion: 7,
// `sourceType` indicates the mode the code should be parsed in.
// Can be either `"script"` or `"module"`. This influences global
// strict mode and parsing of `import` and `export` declarations.
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 only enforced if ecmaVersion >= 5.
// Set `allowReserved` to a boolean value to explicitly turn this on
// an off. When this option has the value "never", reserved words
// and keywords can also not be used as property names.
allowReserved: null,
// 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 tokens returned from `tokenizer().getToken()`. 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 (options.ecmaVersion >= 2015)
options.ecmaVersion -= 2009
if (options.allowReserved == null)
options.allowReserved = options.ecmaVersion < 5
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)
}
}
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