237 lines
7.4 KiB
Lua
237 lines
7.4 KiB
Lua
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local harfbuzz = require("harfbuzz")
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describe("harfbuzz.Buffer", function()
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it("can be created", function()
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harfbuzz.Buffer.new()
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end)
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it("can add a single codepoints with explicit cluster value", function()
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local b = harfbuzz.Buffer.new()
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b:add(0x06CC, 42)
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local glyphs = b:get_glyphs()
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assert.are_equal(#glyphs, 1)
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assert.are_equal(glyphs[1].cluster, 42)
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assert.are_equal(glyphs[1].codepoint, 0x06CC)
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end)
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it("can add a UTF8 string", function()
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local b = harfbuzz.Buffer.new()
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local s = "Some String"
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b:add_utf8(s)
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assert.are_equal(string.len(s), b:get_length())
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end)
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it("can add a UTF 8 string with item_offset", function()
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local b = harfbuzz.Buffer.new()
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local s = "Some String"
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local o = 5
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b:add_utf8(s,o)
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assert.are_equal(string.len(s) - o, b:get_length())
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end)
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it("can add a UTF 8 string with item_length", function()
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local b = harfbuzz.Buffer.new()
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local s = "Some String"
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local o = 5
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local l = 2
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b:add_utf8(s,o,l)
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assert.are_equal(l, b:get_length())
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end)
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it("can add codepoints", function()
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local b = harfbuzz.Buffer.new()
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local s = { 0x06CC, 0x06C1 }
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b:add_codepoints(s)
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assert.are_equal(#s, b:get_length())
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end)
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it("can add codepoints with item_offset", function()
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local b = harfbuzz.Buffer.new()
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local s = { 0x06CC, 0x06C1 }
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local o = 1
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b:add_codepoints(s,o)
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assert.are_equal(#s - o, b:get_length())
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end)
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it("can add codepoints with item_length", function()
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local b = harfbuzz.Buffer.new()
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local s = { 0x06CC, 0x06C1 }
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local o = 1
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local l = 1
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b:add_codepoints(s,o,l)
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assert.are_equal(l, b:get_length())
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end)
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it("can call guess_segment_properties", function()
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local b = harfbuzz.Buffer.new()
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b:add_utf8("Some String")
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b:guess_segment_properties()
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end)
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it("can get and set the direction of a buffer", function()
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local b = harfbuzz.Buffer.new()
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b:add_utf8("abc")
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local dir = harfbuzz.Direction.RTL
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b:set_direction(dir)
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assert.are_equal(dir, b:get_direction())
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end)
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it("sets direction to INVALID if direction is invalid", function()
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local b = harfbuzz.Buffer.new()
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b:set_direction(harfbuzz.Direction.new("invalid"))
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assert.are_equal(harfbuzz.Direction.INVALID, b:get_direction())
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end)
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it("can get the direction correctly", function()
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local b = harfbuzz.Buffer.new()
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b:add_utf8("یہ")
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b:guess_segment_properties()
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assert.are_equal(harfbuzz.Direction.RTL, b:get_direction())
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end)
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it("can get and set the language of a buffer", function()
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local b = harfbuzz.Buffer.new()
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b:add_utf8("یہ")
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local urd = harfbuzz.Language.new("urd")
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b:set_language(urd)
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assert.are_equal(urd, b:get_language())
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end)
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it("Sets language to INVALID if language is invalid", function()
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local b = harfbuzz.Buffer.new()
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b:set_language(harfbuzz.Language.INVALID)
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assert.are_equal(harfbuzz.Language.INVALID, b:get_language())
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end)
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it("can get the language correctly", function()
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local b = harfbuzz.Buffer.new()
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b:add_utf8("یہ")
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b:guess_segment_properties()
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assert.are_not_equal(harfbuzz.Language.INVALID, b:get_language())
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end)
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it("can get and set the script of a buffer", function()
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local b = harfbuzz.Buffer.new()
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b:add_utf8("abc")
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b:set_script(harfbuzz.Script.new("latn"))
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assert.are_equal("Latn", tostring(b:get_script()))
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end)
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it("returns script as UNKNOWN if script is invalid", function()
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local b = harfbuzz.Buffer.new()
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b:set_script(harfbuzz.Script.new("xxx"))
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assert.are_equal(harfbuzz.Script.UNKNOWN, b:get_script())
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end)
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it("can get the script correctly", function()
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local b = harfbuzz.Buffer.new()
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b:add_utf8("یہ")
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assert.are_equal(harfbuzz.Script.new(""), b:get_script())
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b:guess_segment_properties()
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assert.are_equal(harfbuzz.Script.new("Arab"), b:get_script())
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end)
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it("can reverse the buffer", function()
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local face = harfbuzz.Face.new('fonts/notonastaliq.ttf')
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local font = harfbuzz.Font.new(face)
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local urdu_text = "یہ" -- U+06CC U+06C1
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local options = { language = harfbuzz.Language.new("urd"), script = harfbuzz.Script.new("Arab"), direction = harfbuzz.Direction.RTL }
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local buf= harfbuzz.Buffer.new()
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buf:add_utf8(urdu_text)
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harfbuzz.shape(font, buf, options)
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local orig_glyphs = buf:get_glyphs()
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buf:reverse()
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local reversed_glyphs = buf:get_glyphs()
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assert.are_equal(#orig_glyphs, #reversed_glyphs)
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for c = 1, #orig_glyphs do
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local g = orig_glyphs[#orig_glyphs - (c - 1)]
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local r = reversed_glyphs[c]
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assert.are_equal(g.codepoint, r.codepoint)
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assert.are_equal(g.cluster, r.cluster)
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assert.are_equal(g.x_advance, r.x_advance)
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assert.are_equal(g.y_advance, r.y_advance)
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assert.are_equal(g.x_offset, r.x_offset)
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assert.are_equal(g.y_offset, r.y_offset)
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end
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end)
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it("can get the length of the buffer", function()
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local b = harfbuzz.Buffer.new()
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local s = "some string"
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b:add_utf8(s)
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assert.are_equal(string.len(s), b:get_length())
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end)
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it("can get the cluster level of the buffer", function()
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local b = harfbuzz.Buffer.new()
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assert.are_equal(harfbuzz.Buffer.CLUSTER_LEVEL_DEFAULT, b:get_cluster_level())
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end)
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it("can set the cluster level of the buffer", function()
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local b = harfbuzz.Buffer.new()
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b:set_cluster_level(harfbuzz.Buffer.CLUSTER_LEVEL_CHARACTERS)
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assert.are_equal(harfbuzz.Buffer.CLUSTER_LEVEL_CHARACTERS, b:get_cluster_level())
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end)
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it("can get the replacement glyph for invisible characters of the buffer", function()
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local b = harfbuzz.Buffer.new()
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assert.are_equal(0, b:get_invisible_glyph())
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end)
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it("can set the replacement glyph for invisible characters of the buffer", function()
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local b = harfbuzz.Buffer.new()
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b:set_invisible_glyph(3)
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assert.are_equal(3, b:get_invisible_glyph())
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end)
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it("can get the replacement codepoint of the buffer", function()
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local b = harfbuzz.Buffer.new()
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assert.are_equal(0xFFFD, b:get_replacement_codepoint())
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end)
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it("can set the replacement codepoint of the buffer", function()
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local b = harfbuzz.Buffer.new()
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b:set_replacement_codepoint(0xFFFF)
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assert.are_equal(0xFFFF, b:get_replacement_codepoint())
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b:add_utf8("\xFF")
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local glyphs = b:get_glyphs()
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assert.are_equal(1, #glyphs)
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assert.are_equal(0xFFFF, glyphs[1].codepoint)
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end)
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it("can get the flags of the buffer", function()
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local b = harfbuzz.Buffer.new()
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assert.are_equal(harfbuzz.Buffer.FLAG_DEFAULT, b:get_flags())
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end)
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it("can set the flags of the buffer", function()
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local b = harfbuzz.Buffer.new()
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b:set_flags(harfbuzz.Buffer.FLAG_DEFAULT | harfbuzz.Buffer.FLAG_BOT)
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assert.are_equal(harfbuzz.Buffer.FLAG_DEFAULT | harfbuzz.Buffer.FLAG_BOT, b:get_flags())
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end)
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it("can clear the buffer", function()
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local b = harfbuzz.Buffer.new()
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b:add_utf8("abc")
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b:set_flags(harfbuzz.Buffer.FLAG_DEFAULT | harfbuzz.Buffer.FLAG_BOT)
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b:clear_contents()
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assert.are_equal(0, b:get_length())
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assert.are_equal(harfbuzz.Buffer.FLAG_DEFAULT | harfbuzz.Buffer.FLAG_BOT, b:get_flags())
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end)
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it("can reset the buffer", function()
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local b = harfbuzz.Buffer.new()
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b:add_utf8("abc")
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b:set_flags(harfbuzz.Buffer.FLAG_DEFAULT | harfbuzz.Buffer.FLAG_BOT)
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b:reset()
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assert.are_equal(0, b:get_length())
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assert.are_equal(harfbuzz.Buffer.FLAG_DEFAULT, b:get_flags())
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end)
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end)
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