def _read_file(input: io.BufferedIOBase) -> Optional[Font]:
lines: typing.List[str] = [x for x in input.readlines()]
lines = [x for x in lines if not x.startswith("Comment")]
lines = [x[:-1] if x.endswith("\n") else x for x in lines]
# check first/last line
if not lines[0].startswith("StartFontMetrics") or not lines[
-1].startswith("EndFontMetrics"):
return None
out_font = Font()
# FontDescriptor
out_font_descriptor = FontDescriptor().set_parent(
out_font) # type: ignore [attr-defined]
out_font_descriptor[
"FontName"] = AdobeFontMetrics._find_and_parse_as_string(
lines, "FontName")
out_font_descriptor[
"FontFamily"] = AdobeFontMetrics._find_and_parse_as_string(
lines, "FamilyName")
# FontStretch
# FontWeight
# Flags
# FontBBox
# ItalicAngle
out_font_descriptor[
"Ascent"] = AdobeFontMetrics._find_and_parse_as_float(
lines, "Ascender")
out_font_descriptor[
"Descent"] = AdobeFontMetrics._find_and_parse_as_float(
lines, "Descender")
# Leading
out_font_descriptor[
"CapHeight"] = AdobeFontMetrics._find_and_parse_as_float(
lines, "CapHeight")
out_font_descriptor[
"XHeight"] = AdobeFontMetrics._find_and_parse_as_float(
lines, "XHeight")
# StemV
out_font_descriptor[
"StemV"] = AdobeFontMetrics._find_and_parse_as_float(
lines, "StemV")
# StemH
out_font_descriptor[
"StemH"] = AdobeFontMetrics._find_and_parse_as_float(
lines, "StemH")
# AvgWidth
out_font_descriptor[
"AvgWidth"] = AdobeFontMetrics._find_and_parse_as_float(
lines, "AvgWidth")
# MaxWidth
out_font_descriptor[
"MaxWidth"] = AdobeFontMetrics._find_and_parse_as_float(
lines, "MaxWidth")
# MissingWidth
out_font_descriptor[
"MissingWidth"] = AdobeFontMetrics._find_and_parse_as_float(
lines, "MissingWidth")
# FontFile
# FontFile2
# FontFile3
out_font_descriptor[
"CharSet"] = AdobeFontMetrics._find_and_parse_as_integer(
lines, "Characters")
# Font
out_font["Type"] = "Font"
out_font["Subtype"] = "Type1"
out_font["Name"] = out_font_descriptor["FontName"]
out_font["BaseFont"] = out_font_descriptor["FontName"]
widths = List().set_parent(out_font) # type: ignore [attr-defined]
avg_char_width: float = 0
avg_char_width_norm: float = 0
first_char = None
last_char = None
char_metrics_lines = lines[
lines.index([x for x in lines
if x.startswith("StartCharMetrics")][0]
):lines.index("EndCharMetrics") + 1]
char_metrics_lines = char_metrics_lines[1:-1]
for cml in char_metrics_lines:
tmp = {
y.split(" ")[0]: y.split(" ")[1]
for y in [x.strip() for x in cml.split(";")] if " " in y
}
# determine char
ch = -1
if "C" in tmp:
ch = int(tmp["C"])
if "CH" in tmp:
ch = int(tmp["CH"][1:-1], 16)
if (first_char is None or ch < first_char) and ch != -1:
first_char = ch
if (last_char is None or ch > last_char) and ch != -1:
last_char = ch
w = float(tmp["WX"])
if ch != -1 and w != 0:
avg_char_width += w
avg_char_width_norm += 1
widths.append(Decimal(w))
assert first_char is not None
assert last_char is not None
out_font["FirstChar"] = Decimal(first_char)
out_font["LastChar"] = Decimal(last_char)
out_font["Widths"] = widths
if out_font_descriptor["AvgWidth"] is None:
out_font_descriptor["AvgWidth"] = round(
Decimal(avg_char_width / avg_char_width_norm), 2)
if out_font_descriptor["MaxWidth"] is None:
out_font_descriptor["MaxWidth"] = max(widths)
out_font["FontDescriptor"] = out_font_descriptor
# return
return out_font
