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index.js
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index.js
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var acorn = require('acorn')
, walk = require('acorn/util/walk')
, escodegen = require('escodegen')
, DEFAULT_CALLER = {
type: 'BlockStatement',
body: [
{
type: 'ExpressionStatement',
expression: {
type: 'CallExpression',
callee: {
type: 'MemberExpression',
object: {
type: 'Identifier',
name: 'console'
},
property: {
type: 'Identifier',
name: 'error'
},
computed: false
},
arguments: [
{
type: 'Identifier',
name: 'e'
}
]
}
}
]
};
function _parse(str) {
var ast = acorn.parse(str);
return {
type: 'BlockStatement',
body: ast.body
};
}
function _getCalleeName(node) {
if (node.type === 'MemberExpression') {
var name;
walk.simple(node, {
'MemberExpression': function (node) {
if (!name) name = node.object.name;
name += '.' + node.property.name;
}
})
return name;
} else if (node.type === 'Identifier') {
return node.name;
}
}
function _check(ancestors, nameFilter) {
var i = ancestors.length - 2;
switch (ancestors[i].type) {
/*
* a({
* b: function () {
* // for this type function
* }
* });
*/
case 'Property':
if (
ancestors[--i].type === 'ObjectExpression' &&
ancestors[--i].type === 'CallExpression'
) {
return nameFilter(_getCalleeName(ancestors[i].callee));
}
break;
/*
* a(function () {
* // for this type function
* });
*/
case 'CallExpression':
return nameFilter(_getCalleeName(ancestors[i].callee));
}
return true;
}
module.exports = function (code, opt) {
opt = opt || {};
var ast, nameFilter = opt.nameFilter || null
, ignoreDelcaration = opt.ignoreDelcaration || false;
try {
ast = acorn.parse(code);
} catch(e) {
return;
}
walk.ancestor(ast, {
// for FunctionDeclaration & FunctionExpression
Function: function (node, ancestors) {
if (node.type === 'FunctionExpression' && nameFilter && !_check(ancestors, nameFilter)) return;
if (node.type === 'FunctionDeclaration' && ignoreDelcaration) return;
var body = node.body;
node.body = {
type: 'BlockStatement',
body: [
{
type: 'TryStatement',
block: body,
handler: {
type: 'CatchClause',
param: {
type: 'Identifier',
name: 'e'
},
guard: null,
body: opt.caller ?
typeof opt.caller === 'Object' ?
opt.caller : _parse(opt.caller) :
DEFAULT_CALLER
},
guardedHandlers: [],
finalizer: null
}
]
};
}
});
return escodegen.generate(ast, {
format: {
indent: {
style: ' '
}
}
});
};