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first.js
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first.js
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import docsUrl from '../docsUrl'
module.exports = {
meta: {
type: 'suggestion',
docs: {
url: docsUrl('first'),
},
fixable: 'code',
},
create: function (context) {
function isPossibleDirective (node) {
return node.type === 'ExpressionStatement' &&
node.expression.type === 'Literal' &&
typeof node.expression.value === 'string'
}
return {
'Program': function (n) {
const body = n.body
, absoluteFirst = context.options[0] === 'absolute-first'
, message = 'Import in body of module; reorder to top.'
, sourceCode = context.getSourceCode()
, originSourceCode = sourceCode.getText()
let nonImportCount = 0
, anyExpressions = false
, anyRelative = false
, lastLegalImp = null
, errorInfos = []
, shouldSort = true
, lastSortNodesIndex = 0
body.forEach(function (node, index){
if (!anyExpressions && isPossibleDirective(node)) {
return
}
anyExpressions = true
if (node.type === 'ImportDeclaration') {
if (absoluteFirst) {
if (/^\./.test(node.source.value)) {
anyRelative = true
} else if (anyRelative) {
context.report({
node: node.source,
message: 'Absolute imports should come before relative imports.',
})
}
}
if (nonImportCount > 0) {
for (let variable of context.getDeclaredVariables(node)) {
if (!shouldSort) break
const references = variable.references
if (references.length) {
for (let reference of references) {
if (reference.identifier.range[0] < node.range[1]) {
shouldSort = false
break
}
}
}
}
shouldSort && (lastSortNodesIndex = errorInfos.length)
errorInfos.push({
node,
range: [body[index - 1].range[1], node.range[1]],
})
} else {
lastLegalImp = node
}
} else {
nonImportCount++
}
})
if (!errorInfos.length) return
errorInfos.forEach(function (errorInfo, index) {
const node = errorInfo.node
, infos = {
node,
message,
}
if (index < lastSortNodesIndex) {
infos.fix = function (fixer) {
return fixer.insertTextAfter(node, '')
}
} else if (index === lastSortNodesIndex) {
const sortNodes = errorInfos.slice(0, lastSortNodesIndex + 1)
infos.fix = function (fixer) {
const removeFixers = sortNodes.map(function (_errorInfo) {
return fixer.removeRange(_errorInfo.range)
})
, range = [0, removeFixers[removeFixers.length - 1].range[1]]
let insertSourceCode = sortNodes.map(function (_errorInfo) {
const nodeSourceCode = String.prototype.slice.apply(
originSourceCode, _errorInfo.range
)
if (/\S/.test(nodeSourceCode[0])) {
return '\n' + nodeSourceCode
}
return nodeSourceCode
}).join('')
, insertFixer = null
, replaceSourceCode = ''
if (!lastLegalImp) {
insertSourceCode =
insertSourceCode.trim() + insertSourceCode.match(/^(\s+)/)[0]
}
insertFixer = lastLegalImp ?
fixer.insertTextAfter(lastLegalImp, insertSourceCode) :
fixer.insertTextBefore(body[0], insertSourceCode)
const fixers = [insertFixer].concat(removeFixers)
fixers.forEach(function (computedFixer, i) {
replaceSourceCode += (originSourceCode.slice(
fixers[i - 1] ? fixers[i - 1].range[1] : 0, computedFixer.range[0]
) + computedFixer.text)
})
return fixer.replaceTextRange(range, replaceSourceCode)
}
}
context.report(infos)
})
},
}
},
}