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9ac8e33b36
We now rank printf operand candidates according to the corresponding
formatting verb. We follow what fmt allows for the most part, but I
omitted some things because they are uncommon and would result in many
false positives, or didn't seem worth it to support:
- We don't prefer fmt.Stringer or error types for "%x" or "%X".
- We don't prefer pointers for any verbs except "%p".
- We don't prefer recursive application of verbs (e.g. we won't prefer
[]string for "%s").
I decided against sharing code with the printf analyzer. It was
tangled somewhat with go/analysis, and I needed only a very small
subset of the format parsing.
I tweaked candidate type evaluation to accommodate the printf hints.
We now skip expected type of "interface{}" when matching candidate
types because it matches everything and would always supersede the
coarser object kind checks.
Fixes golang/go#40485.
Change-Id: I6440702e33d5ec85d701f8be65453044b5dab746
Reviewed-on: https://go-review.googlesource.com/c/tools/+/246699
Run-TryBot: Muir Manders <muir@mnd.rs>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
73 lines
1.9 KiB
Go
73 lines
1.9 KiB
Go
// Copyright 2020 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package source
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import (
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"fmt"
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"testing"
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)
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func TestFormatOperandKind(t *testing.T) {
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cases := []struct {
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f string
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idx int
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kind objKind
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}{
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{"", 1, kindAny},
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{"%", 1, kindAny},
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{"%%%", 1, kindAny},
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{"%[1", 1, kindAny},
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{"%[?%s", 2, kindAny},
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{"%[abc]v", 1, kindAny},
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{"%v", 1, kindAny},
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{"%T", 1, kindAny},
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{"%t", 1, kindBool},
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{"%d", 1, kindInt},
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{"%c", 1, kindInt},
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{"%o", 1, kindInt},
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{"%O", 1, kindInt},
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{"%U", 1, kindInt},
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{"%e", 1, kindFloat | kindComplex},
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{"%E", 1, kindFloat | kindComplex},
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{"%f", 1, kindFloat | kindComplex},
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{"%F", 1, kindFloat | kindComplex},
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{"%g", 1, kindFloat | kindComplex},
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{"%G", 1, kindFloat | kindComplex},
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{"%b", 1, kindInt | kindFloat | kindComplex | kindBytes},
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{"%q", 1, kindString | kindBytes | kindStringer | kindError},
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{"%s", 1, kindString | kindBytes | kindStringer | kindError},
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{"%x", 1, kindString | kindBytes | kindInt | kindFloat | kindComplex},
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{"%X", 1, kindString | kindBytes | kindInt | kindFloat | kindComplex},
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{"%p", 1, kindPtr | kindSlice},
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{"%w", 1, kindError},
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{"%1.2f", 1, kindFloat | kindComplex},
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{"%*f", 1, kindInt},
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{"%*f", 2, kindFloat | kindComplex},
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{"%*.*f", 1, kindInt},
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{"%*.*f", 2, kindInt},
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{"%*.*f", 3, kindFloat | kindComplex},
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{"%[3]*.[2]*[1]f", 1, kindFloat | kindComplex},
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{"%[3]*.[2]*[1]f", 2, kindInt},
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{"%[3]*.[2]*[1]f", 3, kindInt},
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{"foo %% %d", 1, kindInt},
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{"%#-12.34f", 1, kindFloat | kindComplex},
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{"% d", 1, kindInt},
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{"%s %[1]X %d", 1, kindString | kindBytes},
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{"%s %[1]X %d", 2, kindInt},
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}
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for _, c := range cases {
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t.Run(fmt.Sprintf("%q#%d", c.f, c.idx), func(t *testing.T) {
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if got := formatOperandKind(c.f, c.idx); got != c.kind {
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t.Errorf("expected %d (%[1]b), got %d (%[2]b)", c.kind, got)
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}
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})
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}
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}
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