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45 lines
1.2 KiB
JavaScript
45 lines
1.2 KiB
JavaScript
'use strict';
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var estraverse = require('estraverse');
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var esprima = require('esprima-fb');
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var esrefactor = require('esrefactor');
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var requireRegexp = /require.*\(.*['"]/m;
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function testParse (code) {
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try{
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return esprima.parse(code,{range:true});
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}catch(e){}
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}
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function rename(code, tokenTo, tokenFrom) {
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if (!requireRegexp.test(code)) return code;
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tokenTo = tokenTo || '_dereq_';
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tokenFrom = tokenFrom || 'require';
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if(tokenTo.length !== tokenFrom.length){
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throw new Error('bad stuff will happen if you try to change tokens of different length');
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}
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var inCode = '!function(){'+code+'\n;}';
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var ast = testParse(inCode);
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if(!ast){
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return code;
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}
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var ctx = new esrefactor.Context(inCode);
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estraverse.traverse(ast,{
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enter:function(node, parent) {
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var test =
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parent &&
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(parent.type === 'FunctionDeclaration' || parent.type === 'FunctionExpression') &&
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node.name === tokenFrom &&
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node.type === 'Identifier';
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if(test){
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ctx._code = ctx.rename(ctx.identify(node.range[0]), tokenTo);
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}
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}
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});
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return ctx._code.slice(12, -3);
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}
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module.exports = rename;
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