v / vlib / strings / textscanner / textscanner_test.js.v
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1// vtest build: present_node?


2import strings.textscanner


3


4fn test_remaining() {


5    mut s := textscanner.new('abc')


6    assert s.remaining() == 3


7    s.next()


8    s.next()


9    assert s.remaining() == 1


10    s.next()


11    assert s.remaining() == 0


12    s.next()


13    s.next()


14    assert s.remaining() == 0


15    s.reset()


16    assert s.remaining() == 3


17}


18


19fn test_next() {


20    mut s := textscanner.new('abc')


21    assert s.next() == `a`


22    assert s.next() == `b`


23    assert s.next() == `c`


24    assert s.next() == -1


25    assert s.next() == -1


26    assert s.next() == -1


27}


28


29fn test_skip() {


30    mut s := textscanner.new('abc')


31    assert s.next() == `a`


32    s.skip()


33    assert s.next() == `c`


34    assert s.next() == -1


35


36    s.reset()


37    assert s.peek() == `a`


38    s.skip()


39    assert s.peek() == `b`


40    s.skip()


41    assert s.peek() == `c`


42    s.skip()


43    assert s.peek() == -1


44}


45


46fn test_skip_n() {


47    mut s := textscanner.new('abc')


48    s.skip_n(2)


49    assert s.next() == `c`


50    assert s.next() == -1


51


52    s.reset()


53    assert s.peek() == `a`


54    s.skip_n(2)


55    assert s.peek() == `c`


56    s.skip_n(2)


57    assert s.peek() == -1


58


59    s.reset()


60    assert s.peek() == `a`


61    s.skip_n(3)


62    assert s.peek() == -1


63


64    s.reset()


65    assert s.peek() == `a`


66    s.skip_n(4)


67    assert s.peek() == -1


68}


69


70fn test_peek() {


71    mut s := textscanner.new('abc')


72    assert s.peek() == `a`


73    assert s.peek() == `a`


74    assert s.peek() == `a`


75


76    assert s.next() == `a`


77    assert s.next() == `b`


78    assert s.next() == `c`


79    assert s.next() == -1


80}


81


82fn test_peek_n() {


83    mut s := textscanner.new('abc')


84    assert s.peek_n(0) == `a`


85    assert s.peek_n(1) == `b`


86    assert s.peek_n(2) == `c`


87    assert s.peek_n(3) == -1


88    assert s.peek_n(4) == -1


89


90    assert s.next() == `a`


91    assert s.next() == `b`


92    assert s.next() == `c`


93    assert s.next() == -1


94}


95


96fn test_back() {


97    mut s := textscanner.new('abc')


98    assert s.next() == `a`


99    s.back()


100    assert s.next() == `a`


101    assert s.next() == `b`


102    s.back()


103    assert s.next() == `b`


104    assert s.next() == `c`


105    assert s.next() == -1


106}


107


108fn test_back_n() {


109    mut s := textscanner.new('abc')


110    assert s.next() == `a`


111    s.back_n(10)


112    assert s.next() == `a`


113    assert s.next() == `b`


114    assert s.next() == `c`


115    s.back_n(2)


116    assert s.next() == `b`


117}


118


119fn test_peek_back() {


120    mut s := textscanner.new('abc')


121    assert s.next() == `a`


122    assert s.next() == `b`


123    // check that calling .peek_back() multiple times


124    // does not change the state:


125    assert s.peek_back() == `a`


126    assert s.peek_back() == `a`


127    assert s.peek_back() == `a`


128    // advance, then peek_back again:


129    assert s.next() == `c`


130    assert s.peek_back() == `b`


131    // peeking before the start:


132    s.reset()


133    assert s.peek_back() == -1


134    // peeking right at the end:


135    s.goto_end()


136    assert s.peek_back() == `b`


137}


138


139fn test_peek_back_n() {


140    mut s := textscanner.new('abc')


141    s.goto_end()


142    assert s.peek_back_n(0) == `c`


143    assert s.peek_back_n(1) == `b`


144    assert s.peek_back_n(2) == `a`


145    assert s.peek_back_n(3) == -1


146    assert s.peek_back_n(4) == -1


147}


148


149fn test_reset() {


150    mut s := textscanner.new('abc')


151    assert s.next() == `a`


152    s.next()


153    s.next()


154    assert s.next() == -1


155    s.reset()


156    assert s.next() == `a`


157}


158


159fn test_current() {


160    mut s := textscanner.new('abc')


161    assert s.current() == -1


162    assert s.next() == `a`


163    assert s.current() == `a`


164    assert s.current() == `a`


165    assert s.peek_back() == -1


166    assert s.next() == `b`


167    assert s.current() == `b`


168    assert s.current() == `b`


169    assert s.peek_back() == `a`


170    assert s.next() == `c`


171    assert s.current() == `c`


172    assert s.next() == -1


173    assert s.current() == `c`


174    assert s.next() == -1


175    assert s.current() == `c`


176    s.reset()


177    assert s.current() == -1


178    assert s.next() == `a`


179    assert s.current() == `a`


180}


181


182fn test_goto_end() {


183    mut s := textscanner.new('abc')


184    s.goto_end()


185    assert s.current() == `c`


186}


187