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* refactor: extract shared code for linting if-else chains The rules "early-return", "indent-error-flow" and "superfluous-else" have a similar structure. This moves the common logic for classifying if-else chains to a common package. A few side benefits: - "early-return" now handles os.Exit/log.Panicf/etc - "superfluous-else" now handles (builtin) panic - "superfluous-else" and "indent-error-flow" now handle if/else chains with 2+ "if" branches * internal/ifelse: style fixes, renames, spelling
41 lines
1.0 KiB
Go
41 lines
1.0 KiB
Go
package rule
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import (
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"github.com/mgechev/revive/internal/ifelse"
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"github.com/mgechev/revive/lint"
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)
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// IndentErrorFlowRule lints given else constructs.
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type IndentErrorFlowRule struct{}
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// Apply applies the rule to given file.
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func (e *IndentErrorFlowRule) Apply(file *lint.File, _ lint.Arguments) []lint.Failure {
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return ifelse.Apply(e, file.AST, ifelse.TargetElse)
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}
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// Name returns the rule name.
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func (*IndentErrorFlowRule) Name() string {
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return "indent-error-flow"
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}
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// CheckIfElse evaluates the rule against an ifelse.Chain.
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func (e *IndentErrorFlowRule) CheckIfElse(chain ifelse.Chain) (failMsg string) {
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if !chain.If.Deviates() {
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// this rule only applies if the if-block deviates control flow
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return
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}
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if chain.HasPriorNonDeviating {
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// if we de-indent the "else" block then a previous branch
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// might flow into it, affecting program behaviour
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return
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}
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if !chain.If.Returns() {
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// avoid overlapping with superfluous-else
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return
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}
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return "if block ends with a return statement, so drop this else and outdent its block"
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}
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