matplotlib.dviread
#
A module for reading dvi files output by TeX. Several limitations make this not (currently) useful as a general-purpose dvi preprocessor, but it is currently used by the pdf backend for processing usetex text.
Interface:
with Dvi(filename, 72) as dvi:
# iterate over pages:
for page in dvi:
w, h, d = page.width, page.height, page.descent
for x, y, font, glyph, width in page.text:
fontname = font.texname
pointsize = font.size
...
for x, y, height, width in page.boxes:
...
- class matplotlib.dviread.Dvi(filename, dpi)[source]#
Bases:
object
A reader for a dvi ("device-independent") file, as produced by TeX.
The current implementation can only iterate through pages in order, and does not even attempt to verify the postamble.
This class can be used as a context manager to close the underlying file upon exit. Pages can be read via iteration. Here is an overly simple way to extract text without trying to detect whitespace:
>>> with matplotlib.dviread.Dvi('input.dvi', 72) as dvi: ... for page in dvi: ... print(''.join(chr(t.glyph) for t in page.text))
Read the data from the file named filename and convert TeX's internal units to units of dpi per inch. dpi only sets the units and does not limit the resolution. Use None to return TeX's internal units.
- class matplotlib.dviread.DviFont(scale, tfm, texname, vf)[source]#
Bases:
object
Encapsulation of a font that a DVI file can refer to.
This class holds a font's texname and size, supports comparison, and knows the widths of glyphs in the same units as the AFM file. There are also internal attributes (for use by dviread.py) that are not used for comparison.
The size is in Adobe points (converted from TeX points).
- Parameters:
- scalefloat
Factor by which the font is scaled from its natural size.
- tfmTfm
TeX font metrics for this font
- texnamebytes
Name of the font as used internally by TeX and friends, as an ASCII bytestring. This is usually very different from any external font names;
PsfontsMap
can be used to find the external name of the font.- vfVf
A TeX "virtual font" file, or None if this font is not virtual.
- Attributes:
- texnamebytes
- sizefloat
Size of the font in Adobe points, converted from the slightly smaller TeX points.
- widthslist
Widths of glyphs in glyph-space units, typically 1/1000ths of the point size.
- size#
- texname#
- widths#
- class matplotlib.dviread.PsFont(texname, psname, effects, encoding, filename)[source]#
Bases:
tuple
Create new instance of PsFont(texname, psname, effects, encoding, filename)
- effects#
Alias for field number 2
- encoding#
Alias for field number 3
- filename#
Alias for field number 4
- psname#
Alias for field number 1
- texname#
Alias for field number 0
- class matplotlib.dviread.PsfontsMap(filename)[source]#
Bases:
object
A psfonts.map formatted file, mapping TeX fonts to PS fonts.
- Parameters:
- filenamestr or path-like
Notes
For historical reasons, TeX knows many Type-1 fonts by different names than the outside world. (For one thing, the names have to fit in eight characters.) Also, TeX's native fonts are not Type-1 but Metafont, which is nontrivial to convert to PostScript except as a bitmap. While high-quality conversions to Type-1 format exist and are shipped with modern TeX distributions, we need to know which Type-1 fonts are the counterparts of which native fonts. For these reasons a mapping is needed from internal font names to font file names.
A texmf tree typically includes mapping files called e.g.
psfonts.map
,pdftex.map
, ordvipdfm.map
. The filepsfonts.map
is used by dvips,pdftex.map
by pdfTeX, anddvipdfm.map
by dvipdfm.psfonts.map
might avoid embedding the 35 PostScript fonts (i.e., have no filename for them, as in the Times-Bold example above), while the pdf-related files perhaps only avoid the "Base 14" pdf fonts. But the user may have configured these files differently.Examples
>>> map = PsfontsMap(find_tex_file('pdftex.map')) >>> entry = map[b'ptmbo8r'] >>> entry.texname b'ptmbo8r' >>> entry.psname b'Times-Bold' >>> entry.encoding '/usr/local/texlive/2008/texmf-dist/fonts/enc/dvips/base/8r.enc' >>> entry.effects {'slant': 0.16700000000000001} >>> entry.filename
- class matplotlib.dviread.Tfm(filename)[source]#
Bases:
object
A TeX Font Metric file.
This implementation covers only the bare minimum needed by the Dvi class.
- Parameters:
- filenamestr or path-like
- Attributes:
- checksumint
Used for verifying against the dvi file.
- design_sizeint
Design size of the font (unknown units)
- width, height, depthdict
Dimensions of each character, need to be scaled by the factor specified in the dvi file. These are dicts because indexing may not start from 0.
- checksum#
- depth#
- design_size#
- height#
- width#
- class matplotlib.dviread.Vf(filename)[source]#
Bases:
Dvi
A virtual font (*.vf file) containing subroutines for dvi files.
- Parameters:
- filenamestr or path-like
Notes
The virtual font format is a derivative of dvi: http://mirrors.ctan.org/info/knuth/virtual-fonts This class reuses some of the machinery of
Dvi
but replaces the_read
loop and dispatch mechanism.Examples
vf = Vf(filename) glyph = vf[code] glyph.text, glyph.boxes, glyph.width
Read the data from the file named filename and convert TeX's internal units to units of dpi per inch. dpi only sets the units and does not limit the resolution. Use None to return TeX's internal units.
- matplotlib.dviread.find_tex_file(filename)[source]#
Find a file in the texmf tree using kpathsea.
The kpathsea library, provided by most existing TeX distributions, both on Unix-like systems and on Windows (MikTeX), is invoked via a long-lived luatex process if luatex is installed, or via kpsewhich otherwise.
- Parameters:
- filenamestr or path-like
- Raises:
- FileNotFoundError
If the file is not found.