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from inkex import NSS
from lxml import etree
class FontKerning(object):
"""
This class reads kerning information from an SVG file
"""
def __init__(self, path):
with open(path) as svg:
self.svg = etree.parse(svg)
# horiz_adv_x defines the wdith of specific letters (distance to next letter)
def horiz_adv_x(self):
# In XPath 2.0 we could use ".//svg:glyph/(@unicode|@horiz-adv-x)"
xpath = ".//svg:glyph[@unicode and @horiz-adv-x]/@*[name()='unicode' or name()='horiz-adv-x']"
hax = self.svg.xpath(xpath, namespaces=NSS)
if len(hax) == 0:
return {}
return dict(zip(hax[0::2], [int(x) for x in hax[1::2]]))
# kerning (specific distances of two specified letters)
def hkern(self):
xpath = ".//svg:hkern[(@u1 or @g1) and (@u1 or @g1) and @k]/@*[contains(name(), '1') or contains(name(), '2') or name()='k']"
hkern = self.svg.xpath(xpath, namespaces=NSS)
for index, glyph in enumerate(hkern):
# fontTools.agl will import fontTools.misc.py23 which will output a deprecation warning
# ignore the warning for now - until the library fixed it
if index == 0:
import warnings
with warnings.catch_warnings():
warnings.simplefilter("ignore")
from fontTools.agl import toUnicode
if len(glyph) > 1 and not (index + 1) % 3 == 0:
glyph_names = glyph.split(",")
# the glyph name is written in various languages, second is english. Let's look it up.
if len(glyph_names) == 1:
hkern[index] = toUnicode(glyph)
else:
hkern[index] = toUnicode(glyph_names[1])
k = [int(x) for x in hkern[2::3]]
u = [k + v for k, v in zip(hkern[0::3], hkern[1::3])]
hkern = dict(zip(u, k))
return hkern
# the space character
def word_spacing(self):
xpath = "string(.//svg:glyph[@glyph-name='space'][1]/@*[name()='horiz-adv-x'])"
word_spacing = self.svg.xpath(xpath, namespaces=NSS) or 26
return int(word_spacing)
# default letter spacing
def letter_spacing(self):
xpath = "string(.//svg:font[@horiz-adv-x][1]/@*[name()='horiz-adv-x'])"
letter_spacing = self.svg.xpath(xpath, namespaces=NSS) or 0
return int(letter_spacing)
# this value will be saved into the json file to preserve it for later font edits
# additionally it serves to automatically define the line height (leading)
def units_per_em(self, default=100):
xpath = "string(.//svg:font-face[@units-per-em][1]/@*[name()='units-per-em'])"
units_per_em = self.svg.xpath(xpath, namespaces=NSS) or default
return int(units_per_em)
"""
def missing_glyph_spacing(self):
xpath = "string(.//svg:missing-glyph/@*[name()='horiz-adv-x'])"
return float(self.svg.xpath(xpath, namespaces=NSS))
"""
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