// 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 + 0)
	_ = 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[a]
	_ = s[a:]
	_ = s[:b]
	_ = 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[:b-c]
	_ = 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)

	// test case for issue 8021
	// want:
	//  ([]bool{})[([]int{})[((1)+(((1)+((((1)*(((1)+(1))+(1)))+(1))*(1)))+(1)))]]
	_ = ([]bool{})[([]int{})[((1)+(((1)+((((1)*(((1)+(1))+(1)))+(1))*(1)))+(1)))]]

	// the parser does not restrict expressions that may appear as statements
	true
	42
	"foo"
	x
	(x)
	a + b
	a + b + c
	a + (b * c)
	a + (b / c)
	1 + a
	a + 1
	s[a]
	x << 1
	(s[0] << 1) & 0xf
	"foo" + s
	x == y
	x < y || z > 42
}

// slice expressions with cap
func _() {
	_ = x[a:b:c]
	_ = x[a:b : c+d]
	_ = x[a : b+d : c]
	_ = x[a : b+d : c+d]
	_ = x[a+d : b:c]
	_ = x[a+d : b : c+d]
	_ = x[a+d : b+d : c]
	_ = x[a+d : b+d : c+d]

	_ = x[:b:c]
	_ = x[:b : c+d]
	_ = x[:b+d : c]
	_ = x[:b+d : c+d]
}

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 f(x int, args ...int) {
	f(0, args...)
	f(1, args)
	f(2, args[0])

	// make sure syntactically legal code remains syntactically legal
	f(3, 42 ...)	// a blank must remain between 42 and ...
	f(4, 42....)
	f(5, 42....)
	f(6, 42.0...)
	f(7, 42.0...)
	f(8, .42...)
	f(9, .42...)
	f(10, 42e0...)
	f(11, 42e0...)

	_ = 42 .x	// a blank must remain between 42 and .x
	_ = 42..x
	_ = 42..x
	_ = 42.0.x
	_ = 42.0.x
	_ = .42.x
	_ = .42.x
	_ = 42e0.x
	_ = 42e0.x

	// a blank must remain between the binary operator and the 2nd operand
	_ = x / *y
	_ = x < -1
	_ = x < <-1
	_ = x + +1
	_ = x - -1
	_ = x & &x
	_ = x & ^x

	_ = f(x / *y, x < -1, x < <-1, x + +1, x - -1, x & &x, x & ^x)
}

func _() {
	_ = 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}}
}

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`
	_ = `three spaces before the end of the line starting here:   
they must not be removed`
}

func _() {
	// smart handling of indentation for multi-line raw strings
	var _ = ``
	var _ = `foo`
	var _ = `foo
bar`

	var _ = ``
	var _ = `foo`
	var _ =
	// the next line should remain indented
	`foo
bar`

	var _ =	// comment
	``
	var _ =	// comment
	`foo`
	var _ =	// comment
	// the next line should remain indented
	`foo
bar`

	var _ = /* comment */ ``
	var _ = /* comment */ `foo`
	var _ = /* comment */ `foo
bar`

	var _ =	/* comment */
	``
	var _ =	/* comment */
	`foo`
	var _ =	/* comment */
	// the next line should remain indented
	`foo
bar`

	var board = []int(
		`...........
...........
....●●●....
....●●●....
..●●●●●●●..
..●●●○●●●..
..●●●●●●●..
....●●●....
....●●●....
...........
...........
`)

	var state = S{
		"foo",
		// the next line should remain indented
		`...........
...........
....●●●....
....●●●....
..●●●●●●●..
..●●●○●●●..
..●●●●●●●..
....●●●....
....●●●....
...........
...........
`,
		"bar",
	}
}

func _() {
	// one-line function literals (body is on a single line)
	_ = func() {}
	_ = func() int { return 0 }
	_ = func(x, y int) bool { m := (x + y) / 2; return m < 0 }

	// multi-line function literals (body is not on one line)
	_ = func() {
	}
	_ = func() int {
		return 0
	}
	_ = func(x, y int) bool {
		m := (x + y) / 2
		return x < y
	}

	f(func() {
	})
	f(func() int {
		return 0
	})
	f(func(x, y int) bool {
		m := (x + y) / 2
		return x < y
	})
}

func _() {
	_ = [][]int{
		[]int{1},
		[]int{1, 2},
		[]int{1, 2, 3},
	}
	_ = [][]int{
		{1},
		[]int{1, 2},
		[]int{1, 2, 3},
	}
	_ = [][]int{
		{1},
		{1, 2},
		{1, 2, 3},
	}
	_ = [][]int{{1}, {1, 2}, {1, 2, 3}}
}

// various multi-line expressions
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" +
		"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,
	)
	f(1,
		2,
		3)	// comment
	f(1,
		2,
		3,	// comment
	)
	f(1,
		2,
		3)	// comment
	f(1,
		2,
		3,	// comment
	)
}

// Align comments in multi-line lists of single-line expressions.
var txpix = [NCOL]draw.Color{
	draw.Yellow,	// yellow
	draw.Cyan,	// cyan
	draw.Green,	// lime green
	draw.GreyBlue,	// slate
	draw.Red,	/* red */
	draw.GreyGreen,	/* olive green */
	draw.Blue,	/* blue */
	draw.Color(0xFF55AAFF),	/* pink */
	draw.Color(0xFFAAFFFF),	/* lavender */
	draw.Color(0xBB005DFF),	/* maroon */
}

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
		}
	}
}

func (self *T) foo(x int) *T	{ return self }

func _()	{ module.Func1().Func2() }

func _() {
	_ = new(T).
		foo(1).
		foo(2).
		foo(3)

	_ = new(T).
		foo(1).
		foo(2).	// inline comments
		foo(3)

	_ = new(T).foo(1).foo(2).foo(3)

	// handle multiline argument list correctly
	_ = new(T).
		foo(
		1).
		foo(2)

	_ = new(T).foo(
		1).foo(2)

	_ = Array[3+
		4]

	_ = Method(1, 2,
		3)

	_ = new(T).
		foo().
		bar().(*Type)

	_ = new(T).
		foo().
		bar().(*Type).
		baz()

	_ = new(T).
		foo().
		bar()["idx"]

	_ = new(T).
		foo().
		bar()["idx"].
		baz()

	_ = new(T).
		foo().
		bar()[1:2]

	_ = new(T).
		foo().
		bar()[1:2].
		baz()

	_ = new(T).
		Field.
		Array[3+
		4].
		Table["foo"].
		Blob.(*Type).
		Slices[1:4].
		Method(1, 2,
		3).
		Thingy

	_ = a.b.c
	_ = a.
		b.
		c
	_ = a.b().c
	_ = a.
		b().
		c
	_ = a.b[0].c
	_ = a.
		b[0].
		c
	_ = a.b[0:].c
	_ = a.
		b[0:].
		c
	_ = a.b.(T).c
	_ = a.
		b.(T).
		c
}

// Don't introduce extra newlines in strangely formatted expression lists.
func f() {
	// os.Open parameters should remain on two lines
	if writer, err = os.Open(outfile, s.O_WRONLY|os.O_CREATE|
		os.O_TRUNC, 0666); err != nil {
		log.Fatal(err)
	}
}

// Handle multi-line argument lists ending in ... correctly.
// Was issue 3130.
func _() {
	_ = append(s, a...)
	_ = append(
		s, a...)
	_ = append(s,
		a...)
	_ = append(
		s,
		a...)
	_ = append(s, a...,
	)
	_ = append(s,
		a...,
	)
	_ = append(
		s,
		a...,
	)
}

// Literal function types in conversions must be parenthesized;
// for now go/parser accepts the unparenthesized form where it
// is non-ambiguous.
func _() {
	// these conversions should be rewritten to look
	// the same as the parenthesized conversions below
	_ = (func())(nil)
	_ = (func(x int) float)(nil)
	_ = (func() func() func())(nil)

	_ = (func())(nil)
	_ = (func(x int) float)(nil)
	_ = (func() func() func())(nil)
}
