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46c5260761
This adapts some functionality from the Go standard library for string literal lexing and unquoting/unescaping. The following string types are now supported: Double- or single-quoted strings: These support all escape sequences that Go supports in double-quoted string literals. The difference is that Prometheus also has single-quoted strings (instead of single-quoted runes in Go). Raw newlines are not allowed. Backtick-quoted raw strings: Strings quoted in backticks are treated as raw strings just like in Go and may contain raw newlines and other special characters directly. Fixes https://github.com/prometheus/prometheus/issues/1122 Fixes https://github.com/prometheus/prometheus/issues/1121
126 lines
2.7 KiB
Go
126 lines
2.7 KiB
Go
// Copyright 2015 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package strutil
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import (
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"testing"
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)
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type quoteTest struct {
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in string
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out string
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ascii string
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}
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var quotetests = []quoteTest{
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{"\a\b\f\r\n\t\v", `"\a\b\f\r\n\t\v"`, `"\a\b\f\r\n\t\v"`},
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{"\\", `"\\"`, `"\\"`},
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{"abc\xffdef", `"abc\xffdef"`, `"abc\xffdef"`},
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{"\u263a", `"☺"`, `"\u263a"`},
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{"\U0010ffff", `"\U0010ffff"`, `"\U0010ffff"`},
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{"\x04", `"\x04"`, `"\x04"`},
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}
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type unQuoteTest struct {
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in string
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out string
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}
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var unquotetests = []unQuoteTest{
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{`""`, ""},
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{`"a"`, "a"},
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{`"abc"`, "abc"},
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{`"☺"`, "☺"},
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{`"hello world"`, "hello world"},
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{`"\xFF"`, "\xFF"},
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{`"\377"`, "\377"},
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{`"\u1234"`, "\u1234"},
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{`"\U00010111"`, "\U00010111"},
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{`"\U0001011111"`, "\U0001011111"},
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{`"\a\b\f\n\r\t\v\\\""`, "\a\b\f\n\r\t\v\\\""},
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{`"'"`, "'"},
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{`''`, ""},
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{`'a'`, "a"},
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{`'abc'`, "abc"},
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{`'☺'`, "☺"},
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{`'hello world'`, "hello world"},
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{`'\xFF'`, "\xFF"},
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{`'\377'`, "\377"},
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{`'\u1234'`, "\u1234"},
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{`'\U00010111'`, "\U00010111"},
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{`'\U0001011111'`, "\U0001011111"},
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{`'\a\b\f\n\r\t\v\\\''`, "\a\b\f\n\r\t\v\\'"},
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{`'"'`, "\""},
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{"``", ``},
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{"`a`", `a`},
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{"`abc`", `abc`},
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{"`☺`", `☺`},
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{"`hello world`", `hello world`},
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{"`\\xFF`", `\xFF`},
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{"`\\377`", `\377`},
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{"`\\`", `\`},
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{"`\n`", "\n"},
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{"` `", ` `},
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}
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var misquoted = []string{
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``,
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`"`,
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`"a`,
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`"'`,
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`b"`,
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`"\"`,
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`"\9"`,
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`"\19"`,
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`"\129"`,
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`'\'`,
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`'\9'`,
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`'\19'`,
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`'\129'`,
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`"\x1!"`,
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`"\U12345678"`,
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`"\z"`,
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"`",
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"`xxx",
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"`\"",
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`"\'"`,
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`'\"'`,
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"\"\n\"",
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"\"\\n\n\"",
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"'\n'",
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}
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func TestUnquote(t *testing.T) {
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for _, tt := range unquotetests {
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if out, err := Unquote(tt.in); err != nil && out != tt.out {
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t.Errorf("Unquote(%#q) = %q, %v want %q, nil", tt.in, out, err, tt.out)
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}
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}
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// Run the quote tests too, backward.
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for _, tt := range quotetests {
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if in, err := Unquote(tt.out); in != tt.in {
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t.Errorf("Unquote(%#q) = %q, %v, want %q, nil", tt.out, in, err, tt.in)
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}
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}
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for _, s := range misquoted {
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if out, err := Unquote(s); out != "" || err != ErrSyntax {
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t.Errorf("Unquote(%#q) = %q, %v want %q, %v", s, out, err, "", ErrSyntax)
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}
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}
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}
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