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Add language parameter to Text objects
1 parent 35976c9 commit 736bb64

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14 files changed

+120
-16
lines changed

14 files changed

+120
-16
lines changed

‎lib/matplotlib/_text_helpers.py

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -43,7 +43,7 @@ def warn_on_missing_glyph(codepoint, fontnames):
4343
f"Matplotlib currently does not support {block} natively.")
4444

4545

46-
def layout(string, font, *, kern_mode=Kerning.DEFAULT):
46+
def layout(string, font, language, *, kern_mode=Kerning.DEFAULT):
4747
"""
4848
Render *string* with *font*.
4949
@@ -65,7 +65,7 @@ def layout(string, font, *, kern_mode=Kerning.DEFAULT):
6565
"""
6666
x = 0
6767
prev_glyph_idx = None
68-
char_to_font = font._get_fontmap(string)
68+
char_to_font = font._get_fontmap(string) # TODO: Pass in language.
6969
base_font = font
7070
for char in string:
7171
# This has done the fallback logic

‎lib/matplotlib/backends/backend_agg.py

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -189,7 +189,8 @@ def draw_text(self, gc, x, y, s, prop, angle, ismath=False, mtext=None):
189189
font = self._prepare_font(prop)
190190
# We pass '0' for angle here, since it will be rotated (in raster
191191
# space) in the following call to draw_text_image).
192-
font.set_text(s, 0, flags=get_hinting_flag())
192+
font.set_text(s, 0, flags=get_hinting_flag(),
193+
language=mtext.get_language() if mtext is not None else None)
193194
font.draw_glyphs_to_bitmap(
194195
antialiased=gc.get_antialiased())
195196
d = font.get_descent() / 64.0

‎lib/matplotlib/backends/backend_pdf.py

Lines changed: 4 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -2345,6 +2345,7 @@ def draw_text(self, gc, x, y, s, prop, angle, ismath=False, mtext=None):
23452345
return self.draw_mathtext(gc, x, y, s, prop, angle)
23462346

23472347
fontsize = prop.get_size_in_points()
2348+
language = mtext.get_language() if mtext is not None else None
23482349

23492350
if mpl.rcParams['pdf.use14corefonts']:
23502351
font = self._get_font_afm(prop)
@@ -2355,7 +2356,7 @@ def draw_text(self, gc, x, y, s, prop, angle, ismath=False, mtext=None):
23552356
fonttype = mpl.rcParams['pdf.fonttype']
23562357

23572358
if gc.get_url() is not None:
2358-
font.set_text(s)
2359+
font.set_text(s, language=language)
23592360
width, height = font.get_width_height()
23602361
self.file._annotations[-1][1].append(_get_link_annotation(
23612362
gc, x, y, width / 64, height / 64, angle))
@@ -2389,7 +2390,8 @@ def draw_text(self, gc, x, y, s, prop, angle, ismath=False, mtext=None):
23892390
multibyte_glyphs = []
23902391
prev_was_multibyte = True
23912392
prev_font = font
2392-
for item in _text_helpers.layout(s, font, kern_mode=Kerning.UNFITTED):
2393+
for item in _text_helpers.layout(s, font, language,
2394+
kern_mode=Kerning.UNFITTED):
23932395
if _font_supports_glyph(fonttype, ord(item.char)):
23942396
if prev_was_multibyte or item.ft_object != prev_font:
23952397
singlebyte_chunks.append((item.ft_object, item.x, []))

‎lib/matplotlib/backends/backend_ps.py

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -795,9 +795,10 @@ def draw_text(self, gc, x, y, s, prop, angle, ismath=False, mtext=None):
795795
thisx += width * scale
796796

797797
else:
798+
language = mtext.get_language() if mtext is not None else None
798799
font = self._get_font_ttf(prop)
799800
self._character_tracker.track(font, s)
800-
for item in _text_helpers.layout(s, font):
801+
for item in _text_helpers.layout(s, font, language):
801802
ps_name = (item.ft_object.postscript_name
802803
.encode("ascii", "replace").decode("ascii"))
803804
glyph_name = item.ft_object.get_glyph_name(item.glyph_idx)

‎lib/matplotlib/ft2font.pyi

Lines changed: 5 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -236,7 +236,11 @@ class FT2Font(Buffer):
236236
def set_charmap(self, i: int) -> None: ...
237237
def set_size(self, ptsize: float, dpi: float) -> None: ...
238238
def set_text(
239-
self, string: str, angle: float = ..., flags: LoadFlags = ...
239+
self,
240+
string: str,
241+
angle: float = ...,
242+
flags: LoadFlags = ...,
243+
language: str | list[tuple[str, int, int]] | None = ...,
240244
) -> NDArray[np.float64]: ...
241245
@property
242246
def ascender(self) -> int: ...

‎lib/matplotlib/tests/test_ft2font.py

Lines changed: 21 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -774,6 +774,27 @@ def test_ft2font_set_text():
774774
assert font.get_bitmap_offset() == (6, 0)
775775

776776

777+
def test_ft2font_language_invalid():
778+
file = fm.findfont('DejaVu Sans')
779+
font = ft2font.FT2Font(file, hinting_factor=1, _kerning_factor=0)
780+
with pytest.raises(TypeError):
781+
font.set_text('foo', language=[1, 2, 3])
782+
with pytest.raises(TypeError):
783+
font.set_text('foo', language=[(1, 2)])
784+
with pytest.raises(TypeError):
785+
font.set_text('foo', language=[('en', 'foo', 2)])
786+
with pytest.raises(TypeError):
787+
font.set_text('foo', language=[('en', 1, 'foo')])
788+
789+
790+
def test_ft2font_language():
791+
file = fm.findfont('DejaVu Sans')
792+
font = ft2font.FT2Font(file, hinting_factor=1, _kerning_factor=0)
793+
font.set_text('foo')
794+
font.set_text('foo', language='en')
795+
font.set_text('foo', language=[('en', 1, 2)])
796+
797+
777798
def test_ft2font_loading():
778799
file = fm.findfont('DejaVu Sans')
779800
font = ft2font.FT2Font(file, hinting_factor=1, _kerning_factor=0)

‎lib/matplotlib/tests/test_text.py

Lines changed: 16 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -1190,3 +1190,19 @@ def test_ytick_rotation_mode():
11901190
tick.set_rotation(angle)
11911191

11921192
plt.subplots_adjust(left=0.4, right=0.6, top=.99, bottom=.01)
1193+
1194+
1195+
def test_text_language_invalid():
1196+
with pytest.raises(TypeError, match='must be list of tuple'):
1197+
Text(0, 0, 'foo', language=[1, 2, 3])
1198+
with pytest.raises(TypeError, match='must be list of tuple'):
1199+
Text(0, 0, 'foo', language=[(1, 2)])
1200+
with pytest.raises(TypeError, match='start location must be int'):
1201+
Text(0, 0, 'foo', language=[('en', 'foo', 2)])
1202+
with pytest.raises(TypeError, match='end location must be int'):
1203+
Text(0, 0, 'foo', language=[('en', 1, 'foo')])
1204+
1205+
1206+
def test_text_language():
1207+
Text(0, 0, 'foo', language='en')
1208+
Text(0, 0, 'foo', language=[('en', 1, 2)])

‎lib/matplotlib/text.py

Lines changed: 32 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -136,6 +136,7 @@ def __init__(self,
136136
super().__init__()
137137
self._x, self._y = x, y
138138
self._text = ''
139+
self._language = None
139140
self._reset_visual_defaults(
140141
text=text,
141142
color=color,
@@ -1422,6 +1423,37 @@ def _va_for_angle(self, angle):
14221423
return 'baseline' if anchor_at_left else 'top'
14231424
return 'top' if anchor_at_left else 'baseline'
14241425

1426+
def get_language(self):
1427+
"""Return the language this Text is in."""
1428+
return self._language
1429+
1430+
def set_language(self, language):
1431+
"""
1432+
Set the language of the text.
1433+
1434+
Parameters
1435+
----------
1436+
language : str or list[tuple[str, int, int]]
1437+
The language of the text in a format accepted by libraqm, namely `a BCP47
1438+
language code <https://www.w3.org/International/articles/language-tags/>`_.
1439+
"""
1440+
_api.check_isinstance((list, str, None), language=language)
1441+
if isinstance(language, list):
1442+
for val in language:
1443+
if not isinstance(val, tuple) or len(val) != 3:
1444+
raise TypeError('language must be list of tuple, not {language!r}')
1445+
sublang, start, end = val
1446+
if not isinstance(sublang, str):
1447+
raise TypeError(
1448+
'sub-language specification must be str, not {sublang!r}')
1449+
if not isinstance(start, int):
1450+
raise TypeError('start location must be int, not {start!r}')
1451+
if not isinstance(end, int):
1452+
raise TypeError('end location must be int, not {end!r}')
1453+
1454+
self._language = language
1455+
self.stale = True
1456+
14251457

14261458
class OffsetFrom:
14271459
"""Callable helper class for working with `Annotation`."""

‎lib/matplotlib/text.pyi

Lines changed: 2 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -108,6 +108,8 @@ class Text(Artist):
108108
def set_antialiased(self, antialiased: bool) -> None: ...
109109
def _ha_for_angle(self, angle: Any) -> Literal['center', 'right', 'left'] | None: ...
110110
def _va_for_angle(self, angle: Any) -> Literal['center', 'top', 'baseline'] | None: ...
111+
def get_language(self) -> str | list[tuple[str, int, int]] | None: ...
112+
def set_language(self, language: str | list[tuple[str, int, int]] | None) -> None: ...
111113

112114
class OffsetFrom:
113115
def __init__(

‎lib/matplotlib/textpath.py

Lines changed: 5 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -69,7 +69,7 @@ def get_text_width_height_descent(self, s, prop, ismath):
6969
d /= 64.0
7070
return w * scale, h * scale, d * scale
7171

72-
def get_text_path(self, prop, s, ismath=False):
72+
def get_text_path(self, prop, s, ismath=False, language=None):
7373
"""
7474
Convert text *s* to path (a tuple of vertices and codes for
7575
matplotlib.path.Path).
@@ -109,7 +109,8 @@ def get_text_path(self, prop, s, ismath=False):
109109
glyph_info, glyph_map, rects = self.get_glyphs_tex(prop, s)
110110
elif not ismath:
111111
font = self._get_font(prop)
112-
glyph_info, glyph_map, rects = self.get_glyphs_with_font(font, s)
112+
glyph_info, glyph_map, rects = self.get_glyphs_with_font(font, s,
113+
language=language)
113114
else:
114115
glyph_info, glyph_map, rects = self.get_glyphs_mathtext(prop, s)
115116

@@ -130,7 +131,7 @@ def get_text_path(self, prop, s, ismath=False):
130131
return verts, codes
131132

132133
def get_glyphs_with_font(self, font, s, glyph_map=None,
133-
return_new_glyphs_only=False):
134+
return_new_glyphs_only=False, language=None):
134135
"""
135136
Convert string *s* to vertices and codes using the provided ttf font.
136137
"""
@@ -145,7 +146,7 @@ def get_glyphs_with_font(self, font, s, glyph_map=None,
145146

146147
xpositions = []
147148
glyph_ids = []
148-
for item in _text_helpers.layout(s, font):
149+
for item in _text_helpers.layout(s, font, language):
149150
char_id = self._get_char_id(item.ft_object, ord(item.char))
150151
glyph_ids.append(char_id)
151152
xpositions.append(item.x)

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