// 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.

package expressions

type T struct {
	x, y, z int
}

var (
	a, b, c, d, e						int
	under_bar						int
	longIdentifier1, longIdentifier2, longIdentifier3	int
	t0, t1, t2						T
	s							string
	p							*int
)


func _() {
	// no spaces around simple or parenthesized expressions
	_ = a + b
	_ = a + b + c
	_ = a + b - c
	_ = a - b - c
	_ = a + (b * c)
	_ = a + (b / c)
	_ = a - (b % c)
	_ = 1 + a
	_ = a + 1
	_ = a + b + 1
	_ = s[1:2]
	_ = s[a:b]
	_ = s[0:len(s)]
	_ = s[0] << 1
	_ = (s[0] << 1) & 0xf
	_ = s[0]<<2 | s[1]>>4
	_ = "foo" + s
	_ = s + "foo"
	_ = 'a' + 'b'
	_ = len(s) / 2
	_ = len(t0.x) / a

	// spaces around expressions of different precedence or expressions containing spaces
	_ = a + -b
	_ = a - ^b
	_ = a / *p
	_ = a + b*c
	_ = 1 + b*c
	_ = a + 2*c
	_ = a + c*2
	_ = 1 + 2*3
	_ = s[1 : 2*3]
	_ = s[a : b-c]
	_ = s[0:]
	_ = s[a+b]
	_ = s[a+b:]
	_ = a[a<<b+1]
	_ = a[a<<b+1:]
	_ = s[a+b : len(s)]
	_ = s[len(s):-a]
	_ = s[a : len(s)+1]
	_ = s[a:len(s)+1] + s

	// spaces around operators with equal or lower precedence than comparisons
	_ = a == b
	_ = a != b
	_ = a > b
	_ = a >= b
	_ = a < b
	_ = a <= b
	_ = a < b && c > d
	_ = a < b || c > d

	// spaces around "long" operands
	_ = a + longIdentifier1
	_ = longIdentifier1 + a
	_ = longIdentifier1 + longIdentifier2*longIdentifier3
	_ = s + "a longer string"

	// some selected cases
	_ = a + t0.x
	_ = a + t0.x + t1.x*t2.x
	_ = a + b + c + d + e + 2*3
	_ = a + b + c + 2*3 + d + e
	_ = (a + b + c) * 2
	_ = a - b + c - d + (a + b + c) + d&e
	_ = under_bar - 1
	_ = Open(dpath+"/file", O_WRONLY|O_CREAT, 0666)
	_ = int(c0&_Mask4)<<18 | int(c1&_Maskx)<<12 | int(c2&_Maskx)<<6 | int(c3&_Maskx)
}


func _() {
	a + b
	a + b + c
	a + b*c
	a + (b * c)
	(a + b) * c
	a + (b * c * d)
	a + (b*c + d)

	1 << x
	-1 << x
	1<<x - 1
	-1<<x - 1

	f(a + b)
	f(a + b + c)
	f(a + b*c)
	f(a + (b * c))
	f(1<<x-1, 1<<x-2)

	1<<d.logWindowSize - 1

	buf = make(x, 2*cap(b.buf)+n)

	dst[i*3+2] = dbuf[0] << 2
	dst[i*3+2] = dbuf[0]<<2 | dbuf[1]>>4

	b.buf = b.buf[0 : b.off+m+n]
	b.buf = b.buf[0 : b.off+m*n]
	f(b.buf[0 : b.off+m+n])

	signed += ' ' * 8
	tw.octal(header[148:155], chksum)

	x > 0 && i >= 0

	x1, x0 := x>>w2, x&m2
	z0 = t1<<w2 + t0
	z1 = (t1 + t0>>w2) >> w2
	q1, r1 := x1/d1, x1%d1
	r1 = r1*b2 | x0>>w2
	x1 = (x1 << z) | (x0 >> (uint(w) - z))
	x1 = x1<<z | x0>>(uint(w)-z)

	buf[0 : len(buf)+1]
	buf[0 : n+1]

	a, b = b, a
	a = b + c
	a = b*c + d
	a*b + c
	a - b - c
	a - (b - c)
	a - b*c
	a - (b * c)
	a * b / c
	a / *b
	x[a|^b]
	x[a / *b]
	a & ^b
	a + +b
	a - -b
	x[a*-b]
	x[a + +b]
	x ^ y ^ z
	b[a>>24] ^ b[(a>>16)&0xFF] ^ b[(a>>8)&0xFF] ^ b[a&0xFF]
	len(longVariableName) * 2

	token(matchType + xlength<<lengthShift + xoffset)
}


func _() {
	_ = T{}
	_ = struct{}{}
	_ = [10]T{}
	_ = [...]T{}
	_ = []T{}
	_ = map[int]T{}

	_ = (T){}
	_ = (struct{}){}
	_ = ([10]T){}
	_ = ([...]T){}
	_ = ([]T){}
	_ = (map[int]T){}
}


// one-line structs/interfaces in composite literals (up to a threshold)
func _() {
	_ = struct{}{}
	_ = struct{ x int }{0}
	_ = struct{ x, y, z int }{0, 1, 2}
	_ = struct{ int }{0}
	_ = struct {
		s struct {
			int
		}
	}{struct{ int }{0}}	// compositeLit context not propagated => multiLine result
}


func _() {
	// do not modify literals
	_ = "tab1	tab2	tab3	end"	// string contains 3 tabs
	_ = "tab1 tab2 tab3 end"	// same string with 3 blanks - may be unaligned because editors see tabs in strings
	_ = ""				// this comment should be aligned with the one on the previous line
	_ = ``
	_ = `
`
	_ = `foo
		bar`
}


func _() {
	// one-line function literals
	_ = func() {}
	_ = func() int { return 0 }
	_ = func(x, y int) bool { return x < y }

	f(func() {})
	f(func() int { return 0 })
	f(func(x, y int) bool { return x < y })
}


func _() {
	// do not add extra indentation to multi-line string lists
	_ = "foo" + "bar"
	_ = "foo" +
		"bar" +
		"bah"
	_ = []string{
		"abc" +
			"def",
		"foo" +
			"bar",
	}
}


const _ = F1 +
	`string = "%s";` +
	`ptr = *;` +
	`datafmt.T2 = s ["-" p "-"];`


const _ = `datafmt "datafmt";` +
	`default = "%v";` +
	`array = *;` +
	`datafmt.T3 = s  {" " a a / ","};`


const _ = `datafmt "datafmt";` +
	`default = "%v";` +
	`array = *;` +
	`datafmt.T3 = s  {" " a a / ","};`


func _() {
	_ = F1 +
		`string = "%s";` +
		`ptr = *;` +
		`datafmt.T2 = s ["-" p "-"];`

	_ =
		`datafmt "datafmt";` +
			`default = "%v";` +
			`array = *;` +
			`datafmt.T3 = s  {" " a a / ","};`

	_ = `datafmt "datafmt";` +
		`default = "%v";` +
		`array = *;` +
		`datafmt.T3 = s  {" " a a / ","};`
}


func _() {
	// respect source lines in multi-line expressions
	_ = a +
		b +
		c
	_ = a < b ||
		b < a
	_ = "933262154439441526816992388562667004907159682643816214685929" +
		"638952175999932299156089414639761565182862536979208272237582" +
		"51185210916864000000000000000000000000"	// 100!
	_ = "170141183460469231731687303715884105727"	// prime
}


// Alignment after overlong lines
const (
	_	= "991"
	_	= "2432902008176640000"	// 20!
	_	= "933262154439441526816992388562667004907159682643816214685929" +
		"638952175999932299156089414639761565182862536979208272237582" +
		"51185210916864000000000000000000000000"	// 100!
	_	= "170141183460469231731687303715884105727"	// prime
)


// Correct placement of operators and comments in multi-line expressions
func _() {
	_ = a +	// comment
		b +	// comment
		c
	_ = "a" +	// comment
		"b" +	// comment
		"c"
	_ = "ba0408" + "7265717569726564"	// field 71, encoding 2, string "required"
}


// Correct placement of terminating comma/closing parentheses in multi-line calls.
func _() {
	f(1,
		2,
		3)
	f(1,
		2,
		3,
	)
	// TODO(gri) the cases below are not correct yet
	f(1,
		2,
		3)	// comment
	f(1,
		2,
		3,	// comment
	)
	f(1,
		2,
		3)	// comment
	f(1,
		2,
		3 // comment
		,
	)
}


func same(t, u *Time) bool {
	// respect source lines in multi-line expressions
	return t.Year == u.Year &&
		t.Month == u.Month &&
		t.Day == u.Day &&
		t.Hour == u.Hour &&
		t.Minute == u.Minute &&
		t.Second == u.Second &&
		t.Weekday == u.Weekday &&
		t.ZoneOffset == u.ZoneOffset &&
		t.Zone == u.Zone
}


func (p *parser) charClass() {
	// respect source lines in multi-line expressions
	if cc.negate && len(cc.ranges) == 2 &&
		cc.ranges[0] == '\n' && cc.ranges[1] == '\n' {
		nl := new(_NotNl)
		p.re.add(nl)
	}
}


func addState(s []state, inst instr, match []int) {
	// handle comments correctly in multi-line expressions
	for i := 0; i < l; i++ {
		if s[i].inst.index() == index &&	// same instruction
			s[i].match[0] < pos {	// earlier match already going; leftmost wins
			return s
		}
	}
}