v2 / vlib / strings / textscanner / textscanner_test.v
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1import strings.textscanner


2


3fn test_remaining() {


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


5    assert s.remaining() == 3


6    s.next()


7    s.next()


8    assert s.remaining() == 1


9    s.next()


10    assert s.remaining() == 0


11    s.next()


12    s.next()


13    assert s.remaining() == 0


14    s.reset()


15    assert s.remaining() == 3


16}


17


18fn test_next() {


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


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


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


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


23    assert s.next() == -1


24    assert s.next() == -1


25    assert s.next() == -1


26}


27


28fn test_skip() {


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


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


31    s.skip()


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


33    assert s.next() == -1


34


35    s.reset()


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


37    s.skip()


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


39    s.skip()


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


41    s.skip()


42    assert s.peek() == -1


43}


44


45fn test_skip_n() {


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


47    s.skip_n(2)


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


49    assert s.next() == -1


50


51    s.reset()


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


53    s.skip_n(2)


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


55    s.skip_n(2)


56    assert s.peek() == -1


57


58    s.reset()


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


60    s.skip_n(3)


61    assert s.peek() == -1


62


63    s.reset()


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


65    s.skip_n(4)


66    assert s.peek() == -1


67}


68


69fn test_peek() {


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


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


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


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


74


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


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


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


78    assert s.next() == -1


79}


80


81fn test_peek_n() {


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


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


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


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


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


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


88


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


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


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


92    assert s.next() == -1


93}


94


95fn test_back() {


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


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


98    s.back()


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


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


101    s.back()


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


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


104    assert s.next() == -1


105}


106


107fn test_back_n() {


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


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


110    s.back_n(10)


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


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


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


114    s.back_n(2)


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


116}


117


118fn test_peek_back() {


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


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


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


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


123    // does not change the state:


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


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


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


127    // advance, then peek_back again:


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


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


130    // peeking before the start:


131    s.reset()


132    assert s.peek_back() == -1


133    // peeking right at the end:


134    s.goto_end()


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


136}


137


138fn test_peek_back_n() {


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


140    s.goto_end()


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


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


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


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


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


146}


147


148fn test_reset() {


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


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


151    s.next()


152    s.next()


153    assert s.next() == -1


154    s.reset()


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


156}


157


158fn test_current() {


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


160    assert s.current() == -1


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


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


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


164    assert s.peek_back() == -1


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


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


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


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


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


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


171    assert s.next() == -1


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


173    assert s.next() == -1


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


175    s.reset()


176    assert s.current() == -1


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


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


179}


180


181fn test_goto_end() {


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


183    s.goto_end()


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


185}


186


187fn test_skip_whitespace() {


188    mut s := textscanner.new('abc   d  \n   xyz')


189    assert s.current() == -1


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


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


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


193    s.skip_whitespace()


194    assert s.next() == `d`


195    s.skip_whitespace()


196    assert s.next() == `x`


197    assert s.next() == `y`


198    assert s.next() == `z`


199}


200


201fn test_peek_u8() {


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


203    assert s.peek_u8() == `a`


204    assert !s.peek_u8().is_digit()


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


206    assert s.peek_u8() == `b`


207}


208


209fn test_peek_n_u8() {


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


211    assert s.peek_n_u8(0) == `a`


212    assert s.peek_n_u8(1) == `b`


213    assert s.peek_n_u8(2) == `c`


214    assert s.peek_n_u8(3) == 0


215    assert s.peek_n_u8(4) == 0


216}


217