~jaro/balkon

ref: b179f09782438b387533e231114cd6c53e25cb61 balkon/test/Data/Text/ParagraphLayout/Internal/BreakSpec.hs -rw-r--r-- 4.2 KiB
b179f097 — Jaro Fix version number in changelog. 1 year, 8 months ago 
                                                                                
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
module Data.Text.ParagraphLayout.Internal.BreakSpec (spec) where

import Data.Text (empty, pack, singleton)
import Data.Text.ICU
    (LocaleName(Locale)
    ,breakCharacter
    ,breakLine
    ,breakSentence
    ,breakWord
    )
import qualified Data.Text.ICU as BreakStatus (Line(..), Word(..))

import Test.Hspec
import Data.Text.ParagraphLayout.Internal.Break

spec :: Spec
spec = do

    describe "breaksDesc" $ do

        -- One of the crucial building blocks of a text layout engine.
        describe "breakLine" $ do
            let b lang = breaksDesc $ breakLine (Locale lang)

            it "finds no breaks in empty input" $
                b "en" empty `shouldBe`
                    []

            it "finds break at offset 0 in non-empty input" $
                b "en" (singleton 'a') `shouldBe`
                    [(0, BreakStatus.Soft)]

            it "finds hard break after newline" $
                b "en" (pack "hello\nworld") `shouldBe`
                    [(6, BreakStatus.Hard)
                    ,(0, BreakStatus.Soft)
                    ]

            it "finds soft breaks after spaces and tabs" $
                b "en" (pack "a few\twords") `shouldBe`
                    [(6, BreakStatus.Soft)
                    ,(2, BreakStatus.Soft)
                    ,(0, BreakStatus.Soft)
                    ]

            it "finds soft breaks after spaces and hyphens" $
                b "cs" (pack "následuje stanice Frýdek-Místek") `shouldBe`
                    [(27, BreakStatus.Soft)
                    ,(19, BreakStatus.Soft)
                    ,(11, BreakStatus.Soft)
                    ,(0, BreakStatus.Soft)
                    ]

            it "finds soft breaks in Japanese kana" $
                b "ja" (pack "トイレはどこですか？") `shouldBe`
                    [(24, BreakStatus.Soft)
                    ,(21, BreakStatus.Soft)
                    ,(18, BreakStatus.Soft)
                    ,(15, BreakStatus.Soft)
                    ,(12, BreakStatus.Soft)
                    ,(9, BreakStatus.Soft)
                    ,(6, BreakStatus.Soft)
                    ,(3, BreakStatus.Soft)
                    ,(0, BreakStatus.Soft)
                    ]

        -- Probably not useful for a web browser rendering engine.
        describe "breakSentence" $ do
            let b lang = breaksDesc $ breakSentence (Locale lang)

            it "finds no breaks in empty input" $
                b "en" empty `shouldBe`
                    []

            it "finds break at offset 0 in non-empty input" $
                b "en" (singleton 'a') `shouldBe`
                    [(0, ())]

        -- Probably not useful for a web browser rendering engine,
        -- but may be used for text search and selection.
        describe "breakWord" $ do
            let b lang = breaksDesc $ breakWord (Locale lang)

            it "finds no breaks in empty input" $
                b "en" empty `shouldBe`
                    []

            it "finds break at offset 0 in non-empty input" $
                b "en" (singleton 'a') `shouldBe`
                    [(0, BreakStatus.Uncategorized)]

            it "finds breaks after runs of letters and spaces" $
                b "en" (pack "a few   words") `shouldBe`
                    [(8, BreakStatus.Uncategorized)
                    ,(5, BreakStatus.Letter)
                    ,(2, BreakStatus.Uncategorized)
                    ,(1, BreakStatus.Letter)
                    ,(0, BreakStatus.Uncategorized)
                    ]

        -- Useful for breaking inside words for narrow output.
        -- This can result in breaking ligatures.
        describe "breakCharacter" $ do
            let b lang = breaksDesc $ breakCharacter (Locale lang)

            it "finds no breaks in empty input" $
                b "en" empty `shouldBe`
                    []

            it "finds break at offset 0 in non-empty input" $
                b "en" (singleton 'a') `shouldBe`
                    [(0, ())]

    describe "subOffsetsDesc" $ do

        let result = subOffsetsDesc 5 [(11, 'a'), (8, 'b'), (5, 'c'), (2, 'd')]

        it "should reduce offsets" $
            map fst result `shouldBe` [6, 3, 0]

        it "should preserve payload" $
            map snd result `shouldBe` ['a', 'b', 'c']