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var acorn = require('acorn-node'); | |
var walk = require('acorn-node/walk'); | |
var defined = require('defined'); | |
var requireRe = /\brequire\b/; | |
function parse (src, opts) { | |
if (!opts) opts = {}; | |
var acornOpts = { | |
ranges: defined(opts.ranges, opts.range), | |
locations: defined(opts.locations, opts.loc), | |
allowReserved: defined(opts.allowReserved, true), | |
allowImportExportEverywhere: defined(opts.allowImportExportEverywhere, false) | |
}; | |
// Use acorn-node's defaults for the rest. | |
if (opts.ecmaVersion != null) acornOpts.ecmaVersion = opts.ecmaVersion; | |
if (opts.sourceType != null) acornOpts.sourceType = opts.sourceType; | |
if (opts.allowHashBang != null) acornOpts.allowHashBang = opts.allowHashBang; | |
if (opts.allowReturnOutsideFunction != null) acornOpts.allowReturnOutsideFunction = opts.allowReturnOutsideFunction; | |
return acorn.parse(src, acornOpts); | |
} | |
var exports = module.exports = function (src, opts) { | |
return exports.find(src, opts).strings; | |
}; | |
exports.find = function (src, opts) { | |
if (!opts) opts = {}; | |
var word = opts.word === undefined ? 'require' : opts.word; | |
if (typeof src !== 'string') src = String(src); | |
var isRequire = opts.isRequire || function (node) { | |
return node.callee.type === 'Identifier' | |
&& node.callee.name === word | |
; | |
}; | |
var modules = { strings : [], expressions : [] }; | |
if (opts.nodes) modules.nodes = []; | |
var wordRe = word === 'require' ? requireRe : RegExp('\\b' + word + '\\b'); | |
if (!wordRe.test(src)) return modules; | |
var ast = parse(src, opts.parse); | |
function visit(node, st, c) { | |
var hasRequire = wordRe.test(src.slice(node.start, node.end)); | |
if (!hasRequire) return; | |
walk.base[node.type](node, st, c); | |
if (node.type !== 'CallExpression') return; | |
if (isRequire(node)) { | |
if (node.arguments.length) { | |
var arg = node.arguments[0]; | |
if (arg.type === 'Literal') { | |
modules.strings.push(arg.value); | |
} | |
else if (arg.type === 'TemplateLiteral' | |
&& arg.quasis.length === 1 | |
&& arg.expressions.length === 0) { | |
modules.strings.push(arg.quasis[0].value.raw); | |
} | |
else { | |
modules.expressions.push(src.slice(arg.start, arg.end)); | |
} | |
} | |
if (opts.nodes) modules.nodes.push(node); | |
} | |
} | |
walk.recursive(ast, null, { | |
Statement: visit, | |
Expression: visit | |
}); | |
return modules; | |
}; | |