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pdfinterp.py
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pdfinterp.py
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import logging
import re
from io import BytesIO
from typing import Dict, List, Mapping, Optional, Sequence, Tuple, Union, cast
from . import settings
from .cmapdb import CMap
from .cmapdb import CMapBase
from .cmapdb import CMapDB
from .pdfcolor import PDFColorSpace
from .pdfcolor import PREDEFINED_COLORSPACE
from .pdfdevice import PDFDevice
from .pdfdevice import PDFTextSeq
from .pdffont import PDFCIDFont
from .pdffont import PDFFont
from .pdffont import PDFFontError
from .pdffont import PDFTrueTypeFont
from .pdffont import PDFType1Font
from .pdffont import PDFType3Font
from .pdfpage import PDFPage
from .pdftypes import PDFException
from .pdftypes import PDFObjRef
from .pdftypes import PDFStream
from .pdftypes import dict_value
from .pdftypes import list_value
from .pdftypes import resolve1
from .pdftypes import stream_value
from .psparser import KWD
from .psparser import LIT
from .psparser import PSEOF
from .psparser import PSKeyword
from .psparser import PSLiteral, PSTypeError
from .psparser import PSStackParser
from .psparser import PSStackType
from .psparser import keyword_name
from .psparser import literal_name
from .utils import MATRIX_IDENTITY
from .utils import Matrix, Point, PathSegment, Rect
from .utils import choplist
from .utils import mult_matrix
log = logging.getLogger(__name__)
class PDFResourceError(PDFException):
pass
class PDFInterpreterError(PDFException):
pass
LITERAL_PDF = LIT("PDF")
LITERAL_TEXT = LIT("Text")
LITERAL_FONT = LIT("Font")
LITERAL_FORM = LIT("Form")
LITERAL_IMAGE = LIT("Image")
class PDFTextState:
matrix: Matrix
linematrix: Point
def __init__(self) -> None:
self.font: Optional[PDFFont] = None
self.fontsize: float = 0
self.charspace: float = 0
self.wordspace: float = 0
self.scaling: float = 100
self.leading: float = 0
self.render: int = 0
self.rise: float = 0
self.reset()
# self.matrix is set
# self.linematrix is set
def __repr__(self) -> str:
return (
"<PDFTextState: font=%r, fontsize=%r, charspace=%r, "
"wordspace=%r, scaling=%r, leading=%r, render=%r, rise=%r, "
"matrix=%r, linematrix=%r>"
% (
self.font,
self.fontsize,
self.charspace,
self.wordspace,
self.scaling,
self.leading,
self.render,
self.rise,
self.matrix,
self.linematrix,
)
)
def copy(self) -> "PDFTextState":
obj = PDFTextState()
obj.font = self.font
obj.fontsize = self.fontsize
obj.charspace = self.charspace
obj.wordspace = self.wordspace
obj.scaling = self.scaling
obj.leading = self.leading
obj.render = self.render
obj.rise = self.rise
obj.matrix = self.matrix
obj.linematrix = self.linematrix
return obj
def reset(self) -> None:
self.matrix = MATRIX_IDENTITY
self.linematrix = (0, 0)
Color = Union[
float, # Greyscale
Tuple[float, float, float], # R, G, B
Tuple[float, float, float, float],
] # C, M, Y, K
class PDFGraphicState:
def __init__(self) -> None:
self.linewidth: float = 0
self.linecap: Optional[object] = None
self.linejoin: Optional[object] = None
self.miterlimit: Optional[object] = None
self.dash: Optional[Tuple[object, object]] = None
self.intent: Optional[object] = None
self.flatness: Optional[object] = None
# stroking color
self.scolor: Optional[Color] = None
# non stroking color
self.ncolor: Optional[Color] = None
def copy(self) -> "PDFGraphicState":
obj = PDFGraphicState()
obj.linewidth = self.linewidth
obj.linecap = self.linecap
obj.linejoin = self.linejoin
obj.miterlimit = self.miterlimit
obj.dash = self.dash
obj.intent = self.intent
obj.flatness = self.flatness
obj.scolor = self.scolor
obj.ncolor = self.ncolor
return obj
def __repr__(self) -> str:
return (
"<PDFGraphicState: linewidth=%r, linecap=%r, linejoin=%r, "
" miterlimit=%r, dash=%r, intent=%r, flatness=%r, "
" stroking color=%r, non stroking color=%r>"
% (
self.linewidth,
self.linecap,
self.linejoin,
self.miterlimit,
self.dash,
self.intent,
self.flatness,
self.scolor,
self.ncolor,
)
)
class PDFResourceManager:
"""Repository of shared resources.
ResourceManager facilitates reuse of shared resources
such as fonts and images so that large objects are not
allocated multiple times.
"""
def __init__(self, caching: bool = True) -> None:
self.caching = caching
self._cached_fonts: Dict[object, PDFFont] = {}
def get_procset(self, procs: Sequence[object]) -> None:
for proc in procs:
if proc is LITERAL_PDF:
pass
elif proc is LITERAL_TEXT:
pass
else:
pass
def get_cmap(self, cmapname: str, strict: bool = False) -> CMapBase:
try:
return CMapDB.get_cmap(cmapname)
except CMapDB.CMapNotFound:
if strict:
raise
return CMap()
def get_font(self, objid: object, spec: Mapping[str, object]) -> PDFFont:
if objid and objid in self._cached_fonts:
font = self._cached_fonts[objid]
else:
log.debug("get_font: create: objid=%r, spec=%r", objid, spec)
if settings.STRICT:
if spec["Type"] is not LITERAL_FONT:
raise PDFFontError("Type is not /Font")
# Create a Font object.
if "Subtype" in spec:
subtype = literal_name(spec["Subtype"])
else:
if settings.STRICT:
raise PDFFontError("Font Subtype is not specified.")
subtype = "Type1"
if subtype in ("Type1", "MMType1"):
# Type1 Font
font = PDFType1Font(self, spec)
elif subtype == "TrueType":
# TrueType Font
font = PDFTrueTypeFont(self, spec)
elif subtype == "Type3":
# Type3 Font
font = PDFType3Font(self, spec)
elif subtype in ("CIDFontType0", "CIDFontType2"):
# CID Font
font = PDFCIDFont(self, spec)
elif subtype == "Type0":
# Type0 Font
dfonts = list_value(spec["DescendantFonts"])
assert dfonts
subspec = dict_value(dfonts[0]).copy()
for k in ("Encoding", "ToUnicode"):
if k in spec:
subspec[k] = resolve1(spec[k])
font = self.get_font(None, subspec)
else:
if settings.STRICT:
raise PDFFontError("Invalid Font spec: %r" % spec)
font = PDFType1Font(self, spec) # this is so wrong!
if objid and self.caching:
self._cached_fonts[objid] = font
return font
class PDFContentParser(PSStackParser[Union[PSKeyword, PDFStream]]):
def __init__(self, streams: Sequence[object]) -> None:
self.streams = streams
self.istream = 0
# PSStackParser.__init__(fp=None) is safe only because we've overloaded
# all the methods that would attempt to access self.fp without first
# calling self.fillfp().
PSStackParser.__init__(self, None) # type: ignore[arg-type]
def fillfp(self) -> None:
if not self.fp:
if self.istream < len(self.streams):
strm = stream_value(self.streams[self.istream])
self.istream += 1
else:
raise PSEOF("Unexpected EOF, file truncated?")
self.fp = BytesIO(strm.get_data())
def seek(self, pos: int) -> None:
self.fillfp()
PSStackParser.seek(self, pos)
def fillbuf(self) -> None:
if self.charpos < len(self.buf):
return
while 1:
self.fillfp()
self.bufpos = self.fp.tell()
self.buf = self.fp.read(self.BUFSIZ)
if self.buf:
break
self.fp = None # type: ignore[assignment]
self.charpos = 0
def get_inline_data(self, pos: int, target: bytes = b"EI") -> Tuple[int, bytes]:
self.seek(pos)
i = 0
data = b""
while i <= len(target):
self.fillbuf()
if i:
ci = self.buf[self.charpos]
c = bytes((ci,))
data += c
self.charpos += 1
if len(target) <= i and c.isspace():
i += 1
elif i < len(target) and c == (bytes((target[i],))):
i += 1
else:
i = 0
else:
try:
j = self.buf.index(target[0], self.charpos)
data += self.buf[self.charpos : j + 1]
self.charpos = j + 1
i = 1
except ValueError:
data += self.buf[self.charpos :]
self.charpos = len(self.buf)
data = data[: -(len(target) + 1)] # strip the last part
data = re.sub(rb"(\x0d\x0a|[\x0d\x0a])$", b"", data)
return (pos, data)
def flush(self) -> None:
self.add_results(*self.popall())
KEYWORD_BI = KWD(b"BI")
KEYWORD_ID = KWD(b"ID")
KEYWORD_EI = KWD(b"EI")
def do_keyword(self, pos: int, token: PSKeyword) -> None:
if token is self.KEYWORD_BI:
# inline image within a content stream
self.start_type(pos, "inline")
elif token is self.KEYWORD_ID:
try:
(_, objs) = self.end_type("inline")
if len(objs) % 2 != 0:
error_msg = "Invalid dictionary construct: {!r}".format(objs)
raise PSTypeError(error_msg)
d = {literal_name(k): v for (k, v) in choplist(2, objs)}
(pos, data) = self.get_inline_data(pos + len(b"ID "))
obj = PDFStream(d, data)
self.push((pos, obj))
self.push((pos, self.KEYWORD_EI))
except PSTypeError:
if settings.STRICT:
raise
else:
self.push((pos, token))
PDFStackT = PSStackType[PDFStream]
"""Types that may appear on the PDF argument stack."""
class PDFPageInterpreter:
"""Processor for the content of a PDF page
Reference: PDF Reference, Appendix A, Operator Summary
"""
def __init__(self, rsrcmgr: PDFResourceManager, device: PDFDevice) -> None:
self.rsrcmgr = rsrcmgr
self.device = device
return
def dup(self) -> "PDFPageInterpreter":
return self.__class__(self.rsrcmgr, self.device)
def init_resources(self, resources: Dict[object, object]) -> None:
"""Prepare the fonts and XObjects listed in the Resource attribute."""
self.resources = resources
self.fontmap: Dict[object, PDFFont] = {}
self.xobjmap = {}
self.csmap: Dict[str, PDFColorSpace] = PREDEFINED_COLORSPACE.copy()
if not resources:
return
def get_colorspace(spec: object) -> Optional[PDFColorSpace]:
if isinstance(spec, list):
name = literal_name(spec[0])
else:
name = literal_name(spec)
if name == "ICCBased" and isinstance(spec, list) and 2 <= len(spec):
return PDFColorSpace(name, stream_value(spec[1])["N"])
elif name == "DeviceN" and isinstance(spec, list) and 2 <= len(spec):
return PDFColorSpace(name, len(list_value(spec[1])))
else:
return PREDEFINED_COLORSPACE.get(name)
for (k, v) in dict_value(resources).items():
log.debug("Resource: %r: %r", k, v)
if k == "Font":
for (fontid, spec) in dict_value(v).items():
objid = None
if isinstance(spec, PDFObjRef):
objid = spec.objid
spec = dict_value(spec)
self.fontmap[fontid] = self.rsrcmgr.get_font(objid, spec)
elif k == "ColorSpace":
for (csid, spec) in dict_value(v).items():
colorspace = get_colorspace(resolve1(spec))
if colorspace is not None:
self.csmap[csid] = colorspace
elif k == "ProcSet":
self.rsrcmgr.get_procset(list_value(v))
elif k == "XObject":
for (xobjid, xobjstrm) in dict_value(v).items():
self.xobjmap[xobjid] = xobjstrm
return
def init_state(self, ctm: Matrix) -> None:
"""Initialize the text and graphic states for rendering a page."""
# gstack: stack for graphical states.
self.gstack: List[Tuple[Matrix, PDFTextState, PDFGraphicState]] = []
self.ctm = ctm
self.device.set_ctm(self.ctm)
self.textstate = PDFTextState()
self.graphicstate = PDFGraphicState()
self.curpath: List[PathSegment] = []
# argstack: stack for command arguments.
self.argstack: List[PDFStackT] = []
# set some global states.
self.scs: Optional[PDFColorSpace] = None
self.ncs: Optional[PDFColorSpace] = None
if self.csmap:
self.scs = self.ncs = next(iter(self.csmap.values()))
return
def push(self, obj: PDFStackT) -> None:
self.argstack.append(obj)
return
def pop(self, n: int) -> List[PDFStackT]:
if n == 0:
return []
x = self.argstack[-n:]
self.argstack = self.argstack[:-n]
return x
def get_current_state(self) -> Tuple[Matrix, PDFTextState, PDFGraphicState]:
return (self.ctm, self.textstate.copy(), self.graphicstate.copy())
def set_current_state(
self, state: Tuple[Matrix, PDFTextState, PDFGraphicState]
) -> None:
(self.ctm, self.textstate, self.graphicstate) = state
self.device.set_ctm(self.ctm)
return
def do_q(self) -> None:
"""Save graphics state"""
self.gstack.append(self.get_current_state())
return
def do_Q(self) -> None:
"""Restore graphics state"""
if self.gstack:
self.set_current_state(self.gstack.pop())
return
def do_cm(
self,
a1: PDFStackT,
b1: PDFStackT,
c1: PDFStackT,
d1: PDFStackT,
e1: PDFStackT,
f1: PDFStackT,
) -> None:
"""Concatenate matrix to current transformation matrix"""
self.ctm = mult_matrix(cast(Matrix, (a1, b1, c1, d1, e1, f1)), self.ctm)
self.device.set_ctm(self.ctm)
return
def do_w(self, linewidth: PDFStackT) -> None:
"""Set line width"""
self.graphicstate.linewidth = cast(float, linewidth)
return
def do_J(self, linecap: PDFStackT) -> None:
"""Set line cap style"""
self.graphicstate.linecap = linecap
return
def do_j(self, linejoin: PDFStackT) -> None:
"""Set line join style"""
self.graphicstate.linejoin = linejoin
return
def do_M(self, miterlimit: PDFStackT) -> None:
"""Set miter limit"""
self.graphicstate.miterlimit = miterlimit
return
def do_d(self, dash: PDFStackT, phase: PDFStackT) -> None:
"""Set line dash pattern"""
self.graphicstate.dash = (dash, phase)
return
def do_ri(self, intent: PDFStackT) -> None:
"""Set color rendering intent"""
self.graphicstate.intent = intent
return
def do_i(self, flatness: PDFStackT) -> None:
"""Set flatness tolerance"""
self.graphicstate.flatness = flatness
return
def do_gs(self, name: PDFStackT) -> None:
"""Set parameters from graphics state parameter dictionary"""
# todo
return
def do_m(self, x: PDFStackT, y: PDFStackT) -> None:
"""Begin new subpath"""
self.curpath.append(("m", cast(float, x), cast(float, y)))
return
def do_l(self, x: PDFStackT, y: PDFStackT) -> None:
"""Append straight line segment to path"""
self.curpath.append(("l", cast(float, x), cast(float, y)))
return
def do_c(
self,
x1: PDFStackT,
y1: PDFStackT,
x2: PDFStackT,
y2: PDFStackT,
x3: PDFStackT,
y3: PDFStackT,
) -> None:
"""Append curved segment to path (three control points)"""
self.curpath.append(
(
"c",
cast(float, x1),
cast(float, y1),
cast(float, x2),
cast(float, y2),
cast(float, x3),
cast(float, y3),
)
)
return
def do_v(self, x2: PDFStackT, y2: PDFStackT, x3: PDFStackT, y3: PDFStackT) -> None:
"""Append curved segment to path (initial point replicated)"""
self.curpath.append(
("v", cast(float, x2), cast(float, y2), cast(float, x3), cast(float, y3))
)
return
def do_y(self, x1: PDFStackT, y1: PDFStackT, x3: PDFStackT, y3: PDFStackT) -> None:
"""Append curved segment to path (final point replicated)"""
self.curpath.append(
("y", cast(float, x1), cast(float, y1), cast(float, x3), cast(float, y3))
)
return
def do_h(self) -> None:
"""Close subpath"""
self.curpath.append(("h",))
return
def do_re(self, x: PDFStackT, y: PDFStackT, w: PDFStackT, h: PDFStackT) -> None:
"""Append rectangle to path"""
x = cast(float, x)
y = cast(float, y)
w = cast(float, w)
h = cast(float, h)
self.curpath.append(("m", x, y))
self.curpath.append(("l", x + w, y))
self.curpath.append(("l", x + w, y + h))
self.curpath.append(("l", x, y + h))
self.curpath.append(("h",))
return
def do_S(self) -> None:
"""Stroke path"""
self.device.paint_path(self.graphicstate, True, False, False, self.curpath)
self.curpath = []
return
def do_s(self) -> None:
"""Close and stroke path"""
self.do_h()
self.do_S()
return
def do_f(self) -> None:
"""Fill path using nonzero winding number rule"""
self.device.paint_path(self.graphicstate, False, True, False, self.curpath)
self.curpath = []
return
def do_F(self) -> None:
"""Fill path using nonzero winding number rule (obsolete)"""
return self.do_f()
def do_f_a(self) -> None:
"""Fill path using even-odd rule"""
self.device.paint_path(self.graphicstate, False, True, True, self.curpath)
self.curpath = []
return
def do_B(self) -> None:
"""Fill and stroke path using nonzero winding number rule"""
self.device.paint_path(self.graphicstate, True, True, False, self.curpath)
self.curpath = []
return
def do_B_a(self) -> None:
"""Fill and stroke path using even-odd rule"""
self.device.paint_path(self.graphicstate, True, True, True, self.curpath)
self.curpath = []
return
def do_b(self) -> None:
"""Close, fill, and stroke path using nonzero winding number rule"""
self.do_h()
self.do_B()
return
def do_b_a(self) -> None:
"""Close, fill, and stroke path using even-odd rule"""
self.do_h()
self.do_B_a()
return
def do_n(self) -> None:
"""End path without filling or stroking"""
self.curpath = []
return
def do_W(self) -> None:
"""Set clipping path using nonzero winding number rule"""
return
def do_W_a(self) -> None:
"""Set clipping path using even-odd rule"""
return
def do_CS(self, name: PDFStackT) -> None:
"""Set color space for stroking operations
Introduced in PDF 1.1
"""
try:
self.scs = self.csmap[literal_name(name)]
except KeyError:
if settings.STRICT:
raise PDFInterpreterError("Undefined ColorSpace: %r" % name)
return
def do_cs(self, name: PDFStackT) -> None:
"""Set color space for nonstroking operations"""
try:
self.ncs = self.csmap[literal_name(name)]
except KeyError:
if settings.STRICT:
raise PDFInterpreterError("Undefined ColorSpace: %r" % name)
return
def do_G(self, gray: PDFStackT) -> None:
"""Set gray level for stroking operations"""
self.graphicstate.scolor = cast(float, gray)
self.scs = self.csmap["DeviceGray"]
return
def do_g(self, gray: PDFStackT) -> None:
"""Set gray level for nonstroking operations"""
self.graphicstate.ncolor = cast(float, gray)
self.ncs = self.csmap["DeviceGray"]
return
def do_RG(self, r: PDFStackT, g: PDFStackT, b: PDFStackT) -> None:
"""Set RGB color for stroking operations"""
self.graphicstate.scolor = (cast(float, r), cast(float, g), cast(float, b))
self.scs = self.csmap["DeviceRGB"]
return
def do_rg(self, r: PDFStackT, g: PDFStackT, b: PDFStackT) -> None:
"""Set RGB color for nonstroking operations"""
self.graphicstate.ncolor = (cast(float, r), cast(float, g), cast(float, b))
self.ncs = self.csmap["DeviceRGB"]
return
def do_K(self, c: PDFStackT, m: PDFStackT, y: PDFStackT, k: PDFStackT) -> None:
"""Set CMYK color for stroking operations"""
self.graphicstate.scolor = (
cast(float, c),
cast(float, m),
cast(float, y),
cast(float, k),
)
self.scs = self.csmap["DeviceCMYK"]
return
def do_k(self, c: PDFStackT, m: PDFStackT, y: PDFStackT, k: PDFStackT) -> None:
"""Set CMYK color for nonstroking operations"""
self.graphicstate.ncolor = (
cast(float, c),
cast(float, m),
cast(float, y),
cast(float, k),
)
self.ncs = self.csmap["DeviceCMYK"]
return
def do_SCN(self) -> None:
"""Set color for stroking operations."""
if self.scs:
n = self.scs.ncomponents
else:
if settings.STRICT:
raise PDFInterpreterError("No colorspace specified!")
n = 1
self.graphicstate.scolor = cast(Color, self.pop(n))
return
def do_scn(self) -> None:
"""Set color for nonstroking operations"""
if self.ncs:
n = self.ncs.ncomponents
else:
if settings.STRICT:
raise PDFInterpreterError("No colorspace specified!")
n = 1
self.graphicstate.ncolor = cast(Color, self.pop(n))
return
def do_SC(self) -> None:
"""Set color for stroking operations"""
self.do_SCN()
return
def do_sc(self) -> None:
"""Set color for nonstroking operations"""
self.do_scn()
return
def do_sh(self, name: object) -> None:
"""Paint area defined by shading pattern"""
return
def do_BT(self) -> None:
"""Begin text object
Initializing the text matrix, Tm, and the text line matrix, Tlm, to
the identity matrix. Text objects cannot be nested; a second BT cannot
appear before an ET.
"""
self.textstate.reset()
return
def do_ET(self) -> None:
"""End a text object"""
return
def do_BX(self) -> None:
"""Begin compatibility section"""
return
def do_EX(self) -> None:
"""End compatibility section"""
return
def do_MP(self, tag: PDFStackT) -> None:
"""Define marked-content point"""
self.device.do_tag(cast(PSLiteral, tag))
return
def do_DP(self, tag: PDFStackT, props: PDFStackT) -> None:
"""Define marked-content point with property list"""
self.device.do_tag(cast(PSLiteral, tag), props)
return
def do_BMC(self, tag: PDFStackT) -> None:
"""Begin marked-content sequence"""
self.device.begin_tag(cast(PSLiteral, tag))
return
def do_BDC(self, tag: PDFStackT, props: PDFStackT) -> None:
"""Begin marked-content sequence with property list"""
self.device.begin_tag(cast(PSLiteral, tag), props)
return
def do_EMC(self) -> None:
"""End marked-content sequence"""
self.device.end_tag()
return
def do_Tc(self, space: PDFStackT) -> None:
"""Set character spacing.
Character spacing is used by the Tj, TJ, and ' operators.
:param space: a number expressed in unscaled text space units.
"""
self.textstate.charspace = cast(float, space)
return
def do_Tw(self, space: PDFStackT) -> None:
"""Set the word spacing.
Word spacing is used by the Tj, TJ, and ' operators.
:param space: a number expressed in unscaled text space units
"""
self.textstate.wordspace = cast(float, space)
return
def do_Tz(self, scale: PDFStackT) -> None:
"""Set the horizontal scaling.
:param scale: is a number specifying the percentage of the normal width
"""
self.textstate.scaling = cast(float, scale)
return
def do_TL(self, leading: PDFStackT) -> None:
"""Set the text leading.
Text leading is used only by the T*, ', and " operators.
:param leading: a number expressed in unscaled text space units
"""
self.textstate.leading = -cast(float, leading)
return
def do_Tf(self, fontid: PDFStackT, fontsize: PDFStackT) -> None:
"""Set the text font
:param fontid: the name of a font resource in the Font subdictionary
of the current resource dictionary
:param fontsize: size is a number representing a scale factor.
"""
try:
self.textstate.font = self.fontmap[literal_name(fontid)]
except KeyError:
if settings.STRICT:
raise PDFInterpreterError("Undefined Font id: %r" % fontid)
self.textstate.font = self.rsrcmgr.get_font(None, {})
self.textstate.fontsize = cast(float, fontsize)
return
def do_Tr(self, render: PDFStackT) -> None:
"""Set the text rendering mode"""
self.textstate.render = cast(int, render)
return
def do_Ts(self, rise: PDFStackT) -> None:
"""Set the text rise
:param rise: a number expressed in unscaled text space units
"""
self.textstate.rise = cast(float, rise)
return
def do_Td(self, tx: PDFStackT, ty: PDFStackT) -> None:
"""Move text position"""
tx = cast(float, tx)
ty = cast(float, ty)
(a, b, c, d, e, f) = self.textstate.matrix
self.textstate.matrix = (a, b, c, d, tx * a + ty * c + e, tx * b + ty * d + f)
self.textstate.linematrix = (0, 0)
return
def do_TD(self, tx: PDFStackT, ty: PDFStackT) -> None:
"""Move text position and set leading"""
tx = cast(float, tx)
ty = cast(float, ty)
(a, b, c, d, e, f) = self.textstate.matrix
self.textstate.matrix = (a, b, c, d, tx * a + ty * c + e, tx * b + ty * d + f)
self.textstate.leading = ty
self.textstate.linematrix = (0, 0)
return
def do_Tm(
self,
a: PDFStackT,
b: PDFStackT,
c: PDFStackT,
d: PDFStackT,
e: PDFStackT,
f: PDFStackT,
) -> None:
"""Set text matrix and text line matrix"""
self.textstate.matrix = cast(Matrix, (a, b, c, d, e, f))
self.textstate.linematrix = (0, 0)
return
def do_T_a(self) -> None:
"""Move to start of next text line"""
(a, b, c, d, e, f) = self.textstate.matrix
self.textstate.matrix = (
a,
b,
c,
d,
self.textstate.leading * c + e,
self.textstate.leading * d + f,
)
self.textstate.linematrix = (0, 0)
return
def do_TJ(self, seq: PDFStackT) -> None:
"""Show text, allowing individual glyph positioning"""
if self.textstate.font is None:
if settings.STRICT:
raise PDFInterpreterError("No font specified!")
return
assert self.ncs is not None
self.device.render_string(
self.textstate, cast(PDFTextSeq, seq), self.ncs, self.graphicstate.copy()
)
return
def do_Tj(self, s: PDFStackT) -> None:
"""Show text"""
self.do_TJ([s])
return
def do__q(self, s: PDFStackT) -> None:
"""Move to next line and show text
The ' (single quote) operator.
"""
self.do_T_a()
self.do_TJ([s])
return
def do__w(self, aw: PDFStackT, ac: PDFStackT, s: PDFStackT) -> None:
"""Set word and character spacing, move to next line, and show text
The " (double quote) operator.
"""
self.do_Tw(aw)
self.do_Tc(ac)
self.do_TJ([s])
return
def do_BI(self) -> None:
"""Begin inline image object"""
return
def do_ID(self) -> None:
"""Begin inline image data"""
return
def do_EI(self, obj: PDFStackT) -> None:
"""End inline image object"""
if isinstance(obj, PDFStream) and "W" in obj and "H" in obj:
iobjid = str(id(obj))
self.device.begin_figure(iobjid, (0, 0, 1, 1), MATRIX_IDENTITY)
self.device.render_image(iobjid, obj)
self.device.end_figure(iobjid)
return
def do_Do(self, xobjid_arg: PDFStackT) -> None:
"""Invoke named XObject"""
xobjid = cast(str, literal_name(xobjid_arg))
try:
xobj = stream_value(self.xobjmap[xobjid])
except KeyError:
if settings.STRICT:
raise PDFInterpreterError("Undefined xobject id: %r" % xobjid)
return
log.debug("Processing xobj: %r", xobj)
subtype = xobj.get("Subtype")
if subtype is LITERAL_FORM and "BBox" in xobj:
interpreter = self.dup()
bbox = cast(Rect, list_value(xobj["BBox"]))
matrix = cast(Matrix, list_value(xobj.get("Matrix", MATRIX_IDENTITY)))
# According to PDF reference 1.7 section 4.9.1, XObjects in
# earlier PDFs (prior to v1.2) use the page's Resources entry
# instead of having their own Resources entry.
xobjres = xobj.get("Resources")
if xobjres:
resources = dict_value(xobjres)
else:
resources = self.resources.copy()
self.device.begin_figure(xobjid, bbox, matrix)
interpreter.render_contents(
resources, [xobj], ctm=mult_matrix(matrix, self.ctm)
)
self.device.end_figure(xobjid)
elif subtype is LITERAL_IMAGE and "Width" in xobj and "Height" in xobj:
self.device.begin_figure(xobjid, (0, 0, 1, 1), MATRIX_IDENTITY)
self.device.render_image(xobjid, xobj)
self.device.end_figure(xobjid)
else:
# unsupported xobject type.
pass
return
def process_page(self, page: PDFPage) -> None:
log.debug("Processing page: %r", page)
(x0, y0, x1, y1) = page.mediabox
if page.rotate == 90:
ctm = (0, -1, 1, 0, -y0, x1)
elif page.rotate == 180:
ctm = (-1, 0, 0, -1, x1, y1)
elif page.rotate == 270:
ctm = (0, 1, -1, 0, y1, -x0)
else:
ctm = (1, 0, 0, 1, -x0, -y0)
self.device.begin_page(page, ctm)
self.render_contents(page.resources, page.contents, ctm=ctm)
self.device.end_page(page)
return