Add staticcheck tool

vendor/honnef.co/go/tools/simple/s1007/s1007.go

@@ -0,0 +1,78 @@
+package s1007
+
+import (
+	"fmt"
+	"go/ast"
+	"strings"
+
+	"honnef.co/go/tools/analysis/code"
+	"honnef.co/go/tools/analysis/facts/generated"
+	"honnef.co/go/tools/analysis/lint"
+	"honnef.co/go/tools/analysis/report"
+	"honnef.co/go/tools/pattern"
+
+	"golang.org/x/tools/go/analysis"
+)
+
+var SCAnalyzer = lint.InitializeAnalyzer(&lint.Analyzer{
+	Analyzer: &analysis.Analyzer{
+		Name:     "S1007",
+		Run:      run,
+		Requires: append([]*analysis.Analyzer{generated.Analyzer}, code.RequiredAnalyzers...),
+	},
+	Doc: &lint.RawDocumentation{
+		Title: `Simplify regular expression by using raw string literal`,
+		Text: `Raw string literals use backticks instead of quotation marks and do not support
+any escape sequences. This means that the backslash can be used
+freely, without the need of escaping.
+
+Since regular expressions have their own escape sequences, raw strings
+can improve their readability.`,
+		Before:  `regexp.Compile("\\A(\\w+) profile: total \\d+\\n\\z")`,
+		After:   "regexp.Compile(`\\A(\\w+) profile: total \\d+\\n\\z`)",
+		Since:   "2017.1",
+		MergeIf: lint.MergeIfAny,
+	},
+})
+
+var Analyzer = SCAnalyzer.Analyzer
+
+// TODO(dominikh): support string concat, maybe support constants
+var query = pattern.MustParse(`(CallExpr (Symbol fn@(Or "regexp.MustCompile" "regexp.Compile")) [lit@(BasicLit "STRING" _)])`)
+
+func run(pass *analysis.Pass) (any, error) {
+outer:
+	for _, m := range code.Matches(pass, query) {
+		lit := m.State["lit"].(*ast.BasicLit)
+		val := lit.Value
+		if lit.Value[0] != '"' {
+			// already a raw string
+			continue
+		}
+		if !strings.Contains(val, `\\`) {
+			continue
+		}
+		if strings.Contains(val, "`") {
+			continue
+		}
+
+		bs := false
+		for _, c := range val {
+			if !bs && c == '\\' {
+				bs = true
+				continue
+			}
+			if bs && c == '\\' {
+				bs = false
+				continue
+			}
+			if bs {
+				// backslash followed by non-backslash -> escape sequence
+				continue outer
+			}
+		}
+
+		report.Report(pass, lit, fmt.Sprintf("should use raw string (`...`) with %s to avoid having to escape twice", m.State["fn"]), report.FilterGenerated())
+	}
+	return nil, nil
+}