...
Run Format

Source file test/string_lit.go

Documentation: test

  // run
  
  // Copyright 2009 The Go Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style
  // license that can be found in the LICENSE file.
  
  // Test string literal syntax.
  
  package main
  
  import "os"
  
  var ecode int
  
  func assert(a, b, c string) {
  	if a != b {
  		ecode = 1
  		print("FAIL: ", c, ": ", a, "!=", b, "\n")
  		var max int = len(a)
  		if len(b) > max {
  			max = len(b)
  		}
  		for i := 0; i < max; i++ {
  			ac := 0
  			bc := 0
  			if i < len(a) {
  				ac = int(a[i])
  			}
  			if i < len(b) {
  				bc = int(b[i])
  			}
  			if ac != bc {
  				print("\ta[", i, "] = ", ac, "; b[", i, "] =", bc, "\n")
  			}
  		}
  		panic("string_lit")
  	}
  }
  
  const (
  	gx1    = "aä本☺"
  	gx2    = "aä\xFF\xFF本☺"
  	gx2fix = "aä\uFFFD\uFFFD本☺"
  )
  
  var (
  	gr1 = []rune(gx1)
  	gr2 = []rune(gx2)
  	gb1 = []byte(gx1)
  	gb2 = []byte(gx2)
  )
  
  func main() {
  	ecode = 0
  	s :=
  		"" +
  			" " +
  			"'`" +
  			"a" +
  			"ä" +
  			"本" +
  			"\a\b\f\n\r\t\v\\\"" +
  			"\000\123\x00\xca\xFE\u0123\ubabe\U0000babe" +
  
  			`` +
  			` ` +
  			`'"` +
  			`a` +
  			`ä` +
  			`本` +
  			`\a\b\f\n\r\t\v\\\'` +
  			`\000\123\x00\xca\xFE\u0123\ubabe\U0000babe` +
  			`\x\u\U\`
  
  	assert("", ``, "empty")
  	assert(" ", " ", "blank")
  	assert("\x61", "a", "lowercase a")
  	assert("\x61", `a`, "lowercase a (backquote)")
  	assert("\u00e4", "ä", "a umlaut")
  	assert("\u00e4", `ä`, "a umlaut (backquote)")
  	assert("\u672c", "本", "nihon")
  	assert("\u672c", `本`, "nihon (backquote)")
  	assert("\x07\x08\x0c\x0a\x0d\x09\x0b\x5c\x22",
  		"\a\b\f\n\r\t\v\\\"",
  		"backslashes")
  	assert("\\a\\b\\f\\n\\r\\t\\v\\\\\\\"",
  		`\a\b\f\n\r\t\v\\\"`,
  		"backslashes (backquote)")
  	assert("\x00\x53\000\xca\376S몾몾",
  		"\000\123\x00\312\xFE\u0053\ubabe\U0000babe",
  		"backslashes 2")
  	assert("\\000\\123\\x00\\312\\xFE\\u0123\\ubabe\\U0000babe",
  		`\000\123\x00\312\xFE\u0123\ubabe\U0000babe`,
  		"backslashes 2 (backquote)")
  	assert("\\x\\u\\U\\", `\x\u\U\`, "backslash 3 (backquote)")
  
  	// test large and surrogate-half runes. perhaps not the most logical place for these tests.
  	var r int32
  	r = 0x10ffff // largest rune value
  	s = string(r)
  	assert(s, "\xf4\x8f\xbf\xbf", "largest rune")
  	r = 0x10ffff + 1
  	s = string(r)
  	assert(s, "\xef\xbf\xbd", "too-large rune")
  	r = 0xD800
  	s = string(r)
  	assert(s, "\xef\xbf\xbd", "surrogate rune min")
  	r = 0xDFFF
  	s = string(r)
  	assert(s, "\xef\xbf\xbd", "surrogate rune max")
  	r = -1
  	s = string(r)
  	assert(s, "\xef\xbf\xbd", "negative rune")
  
  	// the large rune tests again, this time using constants instead of a variable.
  	// these conversions will be done at compile time.
  	s = string(0x10ffff) // largest rune value
  	assert(s, "\xf4\x8f\xbf\xbf", "largest rune constant")
  	s = string(0x10ffff + 1)
  	assert(s, "\xef\xbf\xbd", "too-large rune constant")
  	s = string(0xD800)
  	assert(s, "\xef\xbf\xbd", "surrogate rune min constant")
  	s = string(0xDFFF)
  	assert(s, "\xef\xbf\xbd", "surrogate rune max constant")
  	s = string(-1)
  	assert(s, "\xef\xbf\xbd", "negative rune")
  
  	// the large rune tests yet again, with a slice.
  	rs := []rune{0x10ffff, 0x10ffff + 1, 0xD800, 0xDFFF, -1}
  	s = string(rs)
  	assert(s, "\xf4\x8f\xbf\xbf\xef\xbf\xbd\xef\xbf\xbd\xef\xbf\xbd\xef\xbf\xbd", "large rune slice")
  
  	assert(string(gr1), gx1, "global ->[]rune")
  	assert(string(gr2), gx2fix, "global invalid ->[]rune")
  	assert(string(gb1), gx1, "->[]byte")
  	assert(string(gb2), gx2, "global invalid ->[]byte")
  
  	var (
  		r1 = []rune(gx1)
  		r2 = []rune(gx2)
  		b1 = []byte(gx1)
  		b2 = []byte(gx2)
  	)
  	assert(string(r1), gx1, "->[]rune")
  	assert(string(r2), gx2fix, "invalid ->[]rune")
  	assert(string(b1), gx1, "->[]byte")
  	assert(string(b2), gx2, "invalid ->[]byte")
  
  	os.Exit(ecode)
  }
  

View as plain text