54 lines
2.0 KiB
Go
54 lines
2.0 KiB
Go
package sa1010
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import (
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"fmt"
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"go/constant"
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"honnef.co/go/tools/analysis/callcheck"
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"honnef.co/go/tools/analysis/lint"
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"honnef.co/go/tools/go/ir"
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"honnef.co/go/tools/internal/passes/buildir"
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"golang.org/x/tools/go/analysis"
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)
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var SCAnalyzer = lint.InitializeAnalyzer(&lint.Analyzer{
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Analyzer: &analysis.Analyzer{
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Name: "SA1010",
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Requires: []*analysis.Analyzer{buildir.Analyzer},
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Run: callcheck.Analyzer(checkRegexpFindAllRules),
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},
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Doc: &lint.RawDocumentation{
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Title: `\'(*regexp.Regexp).FindAll\' called with \'n == 0\', which will always return zero results`,
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Text: `If \'n >= 0\', the function returns at most \'n\' matches/submatches. To
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return all results, specify a negative number.`,
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Since: "2017.1",
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Severity: lint.SeverityWarning,
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MergeIf: lint.MergeIfAny, // MergeIfAny if we only flag literals, not named constants
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},
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})
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var Analyzer = SCAnalyzer.Analyzer
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var checkRegexpFindAllRules = map[string]callcheck.Check{
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"(*regexp.Regexp).FindAll": RepeatZeroTimes("a FindAll method", 1),
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"(*regexp.Regexp).FindAllIndex": RepeatZeroTimes("a FindAll method", 1),
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"(*regexp.Regexp).FindAllString": RepeatZeroTimes("a FindAll method", 1),
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"(*regexp.Regexp).FindAllStringIndex": RepeatZeroTimes("a FindAll method", 1),
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"(*regexp.Regexp).FindAllStringSubmatch": RepeatZeroTimes("a FindAll method", 1),
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"(*regexp.Regexp).FindAllStringSubmatchIndex": RepeatZeroTimes("a FindAll method", 1),
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"(*regexp.Regexp).FindAllSubmatch": RepeatZeroTimes("a FindAll method", 1),
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"(*regexp.Regexp).FindAllSubmatchIndex": RepeatZeroTimes("a FindAll method", 1),
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}
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func RepeatZeroTimes(name string, arg int) callcheck.Check {
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return func(call *callcheck.Call) {
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arg := call.Args[arg]
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if k, ok := arg.Value.Value.(*ir.Const); ok && k.Value.Kind() == constant.Int {
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if v, ok := constant.Int64Val(k.Value); ok && v == 0 {
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arg.Invalid(fmt.Sprintf("calling %s with n == 0 will return no results, did you mean -1?", name))
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}
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}
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}
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}
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