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@@ -117,11 +117,13 @@ class PDFConverterEx(PDFConverter):
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class Paragraph:
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- def __init__(self, y, x, x0, x1, size, brk):
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+ def __init__(self, y, x, x0, x1, y0, y1, size, brk):
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self.y: float = y # 初始纵坐标
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self.x: float = x # 初始横坐标
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self.x0: float = x0 # 左边界
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self.x1: float = x1 # 右边界
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+ self.y0: float = y0 # 上边界
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+ self.y1: float = y1 # 下边界
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self.size: float = size # 字体大小
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self.brk: bool = brk # 换行标记
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@@ -186,6 +188,8 @@ class TranslateConverter(PDFConverterEx):
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vmax: float = ltpage.width / 4 # 行内公式最大宽度
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ops: str = "" # 渲染结果
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+
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+
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def vflag(font: str, char: str): # 匹配公式（和角标）字体
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if isinstance(font, bytes): # 不一定能 decode，直接转 str
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font = str(font)
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@@ -284,7 +288,7 @@ class TranslateConverter(PDFConverterEx):
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pstk[-1].brk = True
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else: # 根据当前字符构建一个新的段落
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sstk.append("")
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- pstk.append(Paragraph(child.y0, child.x0, child.x0, child.x0, child.size, False))
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+ pstk.append(Paragraph(child.y0, child.x0, child.x0, child.x0, child.y0, child.y1, child.size, False))
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if not cur_v: # 文字入栈
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if ( # 根据当前字符修正段落属性
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child.size > pstk[-1].size # 1. 当前字符比段落字体大
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@@ -304,6 +308,8 @@ class TranslateConverter(PDFConverterEx):
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# 更新段落边界，因为段落内换行之后可能是公式开头，所以要在外边处理
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pstk[-1].x0 = min(pstk[-1].x0, child.x0)
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pstk[-1].x1 = max(pstk[-1].x1, child.x1)
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+ pstk[-1].y0 = min(pstk[-1].y0, child.y0)
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+ pstk[-1].y1 = max(pstk[-1].y1, child.y1)
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# 更新上一个字符
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xt = child
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xt_cls = cls
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@@ -366,20 +372,36 @@ class TranslateConverter(PDFConverterEx):
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else:
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return "".join(["%02x" % ord(c) for c in cstk])
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+ # 根据目标语言获取默认行距
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+ lang_space = {
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+ "zh-cn": 1.4, "zh-tw": 1.4, "zh-hans": 1.4, "zh-hant": 1.4, "zh": 1.4,
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+ "ja": 1.1, "ko": 1.2, "en": 1.2, "ar": 1.0, "ru": 0.8, "uk": 0.8, "ta": 0.8
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+ }
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+ default_line_spacing = lang_space.get(self.translator.lang_out.lower(), 1.1)
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+
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_x, _y = 0, 0
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+
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+ ops_list = []
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+ gen_op_txt = lambda font, size, x, y, rtxt: f"/{font} {size:f} Tf 1 0 0 1 {x:f} {y:f} Tm [<{rtxt}>] TJ "
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+ gen_op_line = lambda x, y, xlen, ylen, linewidth: f"ET q 1 0 0 1 {x:f} {y:f} cm [] 0 d 0 J {linewidth:f} w 0 0 m {xlen:f} {ylen:f} l S Q BT "
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for id, new in enumerate(news):
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- x: float = pstk[id].x # 段落初始横坐标
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- y: float = pstk[id].y # 段落初始纵坐标
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- x0: float = pstk[id].x0 # 段落左边界
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- x1: float = pstk[id].x1 # 段落右边界
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- size: float = pstk[id].size # 段落字体大小
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- brk: bool = pstk[id].brk # 段落换行标记
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- cstk: str = "" # 当前文字栈
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- fcur: str = None # 当前字体 ID
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+ x: float = pstk[id].x # 段落初始横坐标
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+ y: float = pstk[id].y # 段落初始纵坐标
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+ x0: float = pstk[id].x0 # 段落左边界
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+ x1: float = pstk[id].x1 # 段落右边界
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+ height: float = pstk[id].y1 - pstk[id].y0 # 段落高度
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+ size: float = pstk[id].size # 段落字体大小
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+ brk: bool = pstk[id].brk # 段落换行标记
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+ cstk: str = "" # 当前文字栈
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+ fcur: str = None # 当前字体 ID
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+ line = 0 # 记录换行次数
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tx = x
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fcur_ = fcur
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ptr = 0
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log.debug(f"< {y} {x} {x0} {x1} {size} {brk} > {sstk[id]} | {new}")
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+
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+ ops_vals: list[dict] = []
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+
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while ptr < len(new):
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vy_regex = re.match(
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r"\{\s*v([\d\s]+)\}", new[ptr:], re.IGNORECASE
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@@ -415,25 +437,48 @@ class TranslateConverter(PDFConverterEx):
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or x + adv > x1 + 0.1 * size # 3. 到达右边界（可能一整行都被符号化，这里需要考虑浮点误差）
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):
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if cstk:
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- ops += f"/{fcur} {size:f} Tf 1 0 0 1 {tx:f} {y:f} Tm [<{raw_string(fcur, cstk)}>] TJ "
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+ ops_vals.append({
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+ "type": "text",
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+ "font": fcur,
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+ "size": size,
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+ "x": tx,
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+ "dy": 0,
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+ "rtxt": raw_string(fcur, cstk),
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+ "line": line
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+ })
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cstk = ""
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if brk and x + adv > x1 + 0.1 * size: # 到达右边界且原文段落存在换行
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x = x0
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- lang_space = {"zh-cn": 1.4, "zh-tw": 1.4, "zh-hans": 1.4, "zh-hant": 1.4, "zh": 1.4, "ja": 1.1, "ko": 1.2, "en": 1.2, "ar": 1.0, "ru": 0.8, "uk": 0.8, "ta": 0.8}
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- y -= size * lang_space.get(self.translator.lang_out.lower(), 1.1) # 小语种大多适配 1.1
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+ line += 1
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if vy_regex: # 插入公式
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fix = 0
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if fcur is not None: # 段落内公式修正纵向偏移
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fix = varf[vid]
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for vch in var[vid]: # 排版公式字符
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vc = chr(vch.cid)
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- ops += f"/{self.fontid[vch.font]} {vch.size:f} Tf 1 0 0 1 {x + vch.x0 - var[vid][0].x0:f} {fix + y + vch.y0 - var[vid][0].y0:f} Tm [<{raw_string(self.fontid[vch.font], vc)}>] TJ "
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+ ops_vals.append({
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+ "type": "text",
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+ "font": self.fontid[vch.font],
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+ "size": vch.size,
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+ "x": x + vch.x0 - var[vid][0].x0,
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+ "dy": fix + vch.y0 - var[vid][0].y0,
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+ "rtxt": raw_string(self.fontid[vch.font], vc),
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+ "line": line
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+ })
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if log.isEnabledFor(logging.DEBUG):
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lstk.append(LTLine(0.1, (_x, _y), (x + vch.x0 - var[vid][0].x0, fix + y + vch.y0 - var[vid][0].y0)))
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_x, _y = x + vch.x0 - var[vid][0].x0, fix + y + vch.y0 - var[vid][0].y0
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for l in varl[vid]: # 排版公式线条
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if l.linewidth < 5: # hack 有的文档会用粗线条当图片背景
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- ops += f"ET q 1 0 0 1 {l.pts[0][0] + x - var[vid][0].x0:f} {l.pts[0][1] + fix + y - var[vid][0].y0:f} cm [] 0 d 0 J {l.linewidth:f} w 0 0 m {l.pts[1][0] - l.pts[0][0]:f} {l.pts[1][1] - l.pts[0][1]:f} l S Q BT "
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+ ops_vals.append({
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+ "type": "formula",
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+ "x": l.pts[0][0] + x - var[vid][0].x0,
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+ "dy": l.pts[0][1] + fix - var[vid][0].y0,
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+ "linewidth": l.linewidth,
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+ "xlen": l.pts[1][0] - l.pts[0][0],
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+ "ylen": l.pts[1][1] - l.pts[0][1],
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+ "line": line
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+ })
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else: # 插入文字缓冲区
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if not cstk: # 单行开头
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tx = x
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@@ -451,9 +496,31 @@ class TranslateConverter(PDFConverterEx):
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_x, _y = x, y
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# 处理结尾
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if cstk:
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- ops += f"/{fcur} {size:f} Tf 1 0 0 1 {tx:f} {y:f} Tm [<{raw_string(fcur, cstk)}>] TJ "
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+ ops_vals.append({
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+ "type": "text",
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+ "font": fcur,
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+ "size": size,
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+ "x": tx,
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+ "dy": 0,
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+ "rtxt": raw_string(fcur, cstk),
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+ "line": line
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+ })
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+
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+ line_spacing = default_line_spacing
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+
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+ while (line + 1) * size * line_spacing > height and line_spacing >= 1:
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+ line_spacing -= 0.05
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+
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+ for vals in ops_vals:
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+ match vals["type"]:
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+ case "text":
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+ ops_list.append(gen_op_txt(vals["font"], vals["size"], vals["x"], vals["dy"] + y - vals["line"] * size * line_spacing, vals["rtxt"]))
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+ case "formula":
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+ ops_list.append(gen_op_line(vals["x"], vals["dy"] + y - vals["line"] * size * line_spacing, vals["xlen"], vals["ylen"], vals["linewidth"]))
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+
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for l in lstk: # 排版全局线条
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if l.linewidth < 5: # hack 有的文档会用粗线条当图片背景
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- ops += f"ET q 1 0 0 1 {l.pts[0][0]:f} {l.pts[0][1]:f} cm [] 0 d 0 J {l.linewidth:f} w 0 0 m {l.pts[1][0] - l.pts[0][0]:f} {l.pts[1][1] - l.pts[0][1]:f} l S Q BT "
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- ops = f"BT {ops}ET "
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+ ops_list.append(gen_op_line(l.pts[0][0], l.pts[0][1], l.pts[1][0] - l.pts[0][0], l.pts[1][1] - l.pts[0][1], l.linewidth))
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+
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+ ops = f"BT {''.join(ops_list)}ET "
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return ops
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timel