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