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import strings.textscanner
fn test_remaining() {
mut s := textscanner.new('abc')
assert s.remaining() == 3
s.next()
s.next()
assert s.remaining() == 1
s.next()
assert s.remaining() == 0
s.next()
s.next()
assert s.remaining() == 0
s.reset()
assert s.remaining() == 3
}
fn test_next() {
mut s := textscanner.new('abc')
assert s.next() == `a`
assert s.next() == `b`
assert s.next() == `c`
assert s.next() == -1
assert s.next() == -1
assert s.next() == -1
}
fn test_skip() {
mut s := textscanner.new('abc')
assert s.next() == `a`
s.skip()
assert s.next() == `c`
assert s.next() == -1
}
fn test_skip_n() {
mut s := textscanner.new('abc')
s.skip_n(2)
assert s.next() == `c`
assert s.next() == -1
}
fn test_peek() {
mut s := textscanner.new('abc')
assert s.peek() == `a`
assert s.peek() == `a`
assert s.peek() == `a`
//
assert s.next() == `a`
assert s.next() == `b`
assert s.next() == `c`
assert s.next() == -1
}
fn test_peek_n() {
mut s := textscanner.new('abc')
assert s.peek_n(0) == `a`
assert s.peek_n(1) == `b`
assert s.peek_n(2) == `c`
assert s.peek_n(3) == -1
assert s.peek_n(4) == -1
//
assert s.next() == `a`
assert s.next() == `b`
assert s.next() == `c`
assert s.next() == -1
}
fn test_back() {
mut s := textscanner.new('abc')
assert s.next() == `a`
s.back()
assert s.next() == `a`
assert s.next() == `b`
s.back()
assert s.next() == `b`
assert s.next() == `c`
assert s.next() == -1
}
fn test_back_n() {
mut s := textscanner.new('abc')
assert s.next() == `a`
s.back_n(10)
assert s.next() == `a`
assert s.next() == `b`
assert s.next() == `c`
s.back_n(2)
assert s.next() == `b`
}
fn test_peek_back() {
mut s := textscanner.new('abc')
assert s.next() == `a`
assert s.next() == `b`
// check that calling .peek_back() multiple times
// does not change the state:
assert s.peek_back() == `a`
assert s.peek_back() == `a`
assert s.peek_back() == `a`
// advance, then peek_back again:
assert s.next() == `c`
assert s.peek_back() == `b`
// peeking before the start:
s.reset()
assert s.peek_back() == -1
// peeking right at the end:
s.goto_end()
assert s.peek_back() == `b`
}
fn test_peek_back_n() {
mut s := textscanner.new('abc')
s.goto_end()
assert s.peek_back_n(0) == `c`
assert s.peek_back_n(1) == `b`
assert s.peek_back_n(2) == `a`
assert s.peek_back_n(3) == -1
assert s.peek_back_n(4) == -1
}
fn test_reset() {
mut s := textscanner.new('abc')
assert s.next() == `a`
s.next()
s.next()
assert s.next() == -1
s.reset()
assert s.next() == `a`
}
fn test_current() {
mut s := textscanner.new('abc')
assert s.current() == -1
assert s.next() == `a`
assert s.current() == `a`
assert s.current() == `a`
assert s.peek_back() == -1
assert s.next() == `b`
assert s.current() == `b`
assert s.current() == `b`
assert s.peek_back() == `a`
assert s.next() == `c`
assert s.current() == `c`
assert s.next() == -1
assert s.current() == `c`
assert s.next() == -1
assert s.current() == `c`
s.reset()
assert s.current() == -1
assert s.next() == `a`
assert s.current() == `a`
}
fn test_goto_end() {
mut s := textscanner.new('abc')
s.goto_end()
assert s.current() == `c`
}
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