init: WordFileParse docx→HTML 解析服务（含 Word EQ 域公式修复）
服务：Spring Boot 3.2 + docx4j 8.3.9，POST /api/v3/server_office_file/file/parse
接受 .docx，返回 HTML（公式 → LaTeX，图片 → RustFS 外链）
公式支持三类来源：
- OMML（Word 2007+ 公式） → Python omml_mathml2latex
- MathType OLE 对象 → Ruby mathtype2mathml → MathML → LaTeX
- Word EQ 域（老教辅主力） → EqToLatexUtil（本次新增）
本次改动：
1. 新增 java-svc/.../core/EqToLatexUtil.java：
移植自 jby backend-services office-core，EQ 语法 → LaTeX
（\f→\dfrac、\r→\sqrt、\i→\int/\sum/\prod、\s→^{}/_{}、\b→\left\right、
\a→array、\x→\boxed/\overline、\o\al 堆叠、圈码、化学符号、极限、连等式）
品牌标记 JBYU* → WPU*，与采集端一致
2. CtoMathFinder：接上 EQ 分支（原为 not-ported 桩），域代码经
EqToLatexUtil.convert 转 LaTeX 写入 eqLatexMap（WPEQNUM 占位符）
3. WordParseUtil.dealPlaceholder：EQ 的 LaTeX 同样加 \( \) 包裹
（原先因 WPEQNUM 例外不加包裹，前端/MathJax 不渲染）
修前症状：教辅 Word 里分式/方程组/上下标整段丢失（如 {−1/3, 1} 变成 {－，1}）
修后实测：46 份教辅 2908 处 EQ 域全部还原，公式总数 2954 处、零未包裹残留
安全：application.yml（含 RustFS 密钥）不入库，提供 application.yml.example；
OssService 的 @Value 默认密钥已清空
This commit is contained in:
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scripts/omml_mathml2latex/visitors/mroot_visitor.py
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scripts/omml_mathml2latex/visitors/mroot_visitor.py
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r"""
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Visitor for <mroot> (nth root) MathML elements.
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The <mroot> element represents nth roots with explicit index.
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The LaTeX conversion uses \sqrt[n]{...} notation.
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Note: When index is 2, optimizes to \sqrt{...} (standard square root).
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"""
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from lxml import etree as ET
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from ..core.interfaces import Visitor, Strategy
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from ..utils import text_content as _text_content, local_name as _local
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class MrootVisitor(Visitor):
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r"""
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Handles <mroot> (nth root) MathML elements.
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Converts nth root expressions to LaTeX \sqrt[n]{...} notation.
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Optimizes square roots (index=2) to \sqrt{...}.
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Examples:
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Cube root:
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<mroot><mi>x</mi><mn>3</mn></mroot> → \sqrt[3]{x}
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Fourth root:
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<mroot><mn>16</mn><mn>4</mn></mroot> → \sqrt[4]{16}
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Square root (optimized):
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<mroot><mi>x</mi><mn>2</mn></mroot> → \sqrt{x}
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Variable index:
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<mroot><mi>x</mi><mi>n</mi></mroot> → \sqrt[n]{x}
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Complex base:
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<mroot>
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<mrow><mi>x</mi><mo>+</mo><mn>1</mn></mrow>
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<mn>3</mn>
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</mroot>
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→ \sqrt[3]{x + 1}
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"""
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def __init__(self, strategy: Strategy):
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"""Initialize the Mroot visitor."""
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super().__init__(strategy)
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def visit(self, node: ET.Element) -> str:
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r"""
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Convert <mroot> element to LaTeX.
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Args:
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node: The <mroot> element to convert
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Returns:
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LaTeX nth root string (\sqrt[n]{content} or \sqrt{content})
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Raises:
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ValueError: If node is not an <mroot> element
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ValueError: If mroot has fewer than 2 children
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"""
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if not self.can_handle(node):
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raise ValueError(f"MrootVisitor cannot handle element '{node.tag}'")
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children = list(node)
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# mroot must have exactly 2 children: base and index
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# Handle malformed input gracefully for MathJax compatibility
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if len(children) < 2:
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if len(children) == 0:
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return "\\sqrt{}"
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elif len(children) == 1:
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# Only base provided, assume square root
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base = self._convert_child(children[0])
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return f"\\sqrt{self._brace(base)}"
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# Convert base (radicand) and index (root degree)
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base = self._convert_child(children[0])
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index = self._convert_child(children[1])
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# Optimize: omit [2] for square roots (standard mathematical notation)
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# Also omit empty brackets [] when index is empty
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index_stripped = index.strip()
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if index_stripped == "2" or not index_stripped:
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return f"\\sqrt{self._brace(base)}"
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else:
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return f"\\sqrt[{index}]{self._brace(base)}"
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def _convert_child(self, child: ET.Element) -> str:
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"""Convert a child element to LaTeX."""
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tag = _local(child.tag)
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# Import visitors as needed to avoid circular imports
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if tag == 'mi':
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from .mi_visitor import MiVisitor
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return MiVisitor(self.strategy).visit(child)
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elif tag == 'mo':
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from .mo_visitor import MoVisitor
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return MoVisitor(self.strategy).visit(child)
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elif tag == 'mn':
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from .mn_visitor import MnVisitor
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return MnVisitor(self.strategy).visit(child)
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elif tag == 'mfrac':
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from .mfrac_visitor import MfracVisitor
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return MfracVisitor(self.strategy).visit(child)
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elif tag == 'msup':
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from .msup_visitor import MsupVisitor
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return MsupVisitor(self.strategy).visit(child)
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elif tag == 'msub':
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from .msub_visitor import MsubVisitor
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return MsubVisitor(self.strategy).visit(child)
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elif tag == 'mrow':
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from .mrow_visitor import MrowVisitor
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return MrowVisitor(self.strategy).visit(child)
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elif tag == 'msqrt':
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from .msqrt_visitor import MsqrtVisitor
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return MsqrtVisitor(self.strategy).visit(child)
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elif tag == 'mroot':
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from .mroot_visitor import MrootVisitor
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return MrootVisitor(self.strategy).visit(child)
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elif tag == 'msubsup':
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from .msubsup_visitor import MsubsupVisitor
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return MsubsupVisitor(self.strategy).visit(child)
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elif tag == 'munder':
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from .munder_visitor import MunderVisitor
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return MunderVisitor(self.strategy).visit(child)
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elif tag == 'mover':
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from .mover_visitor import MoverVisitor
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return MoverVisitor(self.strategy).visit(child)
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elif tag == 'munderover':
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from .munderover_visitor import MunderoverVisitor
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return MunderoverVisitor(self.strategy).visit(child)
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elif tag == 'mfenced':
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from .mfenced_visitor import MfencedVisitor
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return MfencedVisitor(self.strategy).visit(child)
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elif tag == 'mtable':
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from .mtable_visitor import MtableVisitor
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return MtableVisitor(self.strategy).visit(child)
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elif tag == 'mtext':
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from .mtext_visitor import MtextVisitor
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return MtextVisitor(self.strategy).visit(child)
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elif tag == 'mstyle':
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from .mstyle_visitor import MstyleVisitor
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return MstyleVisitor(self.strategy).visit(child)
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elif tag == 'mspace':
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from .mspace_visitor import MspaceVisitor
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return MspaceVisitor(self.strategy).visit(child)
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elif tag == 'menclose':
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from .menclose_visitor import MencloseVisitor
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return MencloseVisitor(self.strategy).visit(child)
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elif tag == 'mmultiscripts':
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from .mmultiscripts_visitor import MmultiscriptsVisitor
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return MmultiscriptsVisitor(self.strategy).visit(child)
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elif tag == 'maction':
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from .maction_visitor import MactionVisitor
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return MactionVisitor(self.strategy).visit(child)
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elif tag == 'merror':
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from .merror_visitor import MerrorVisitor
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return MerrorVisitor(self.strategy).visit(child)
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elif tag == 'mpadded':
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from .mpadded_visitor import MpaddedVisitor
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return MpaddedVisitor(self.strategy).visit(child)
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elif tag == 'mphantom':
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from .mphantom_visitor import MphantomVisitor
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return MphantomVisitor(self.strategy).visit(child)
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elif tag == 'ms':
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from .ms_visitor import MsVisitor
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return MsVisitor(self.strategy).visit(child)
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elif tag == 'mglyph':
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from .mglyph_visitor import MglyphVisitor
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return MglyphVisitor(self.strategy).visit(child)
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elif tag == 'maligngroup':
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from .maligngroup_visitor import MaligngroupVisitor
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return MaligngroupVisitor(self.strategy).visit(child)
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elif tag == 'malignmark':
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from .malignmark_visitor import MalignmarkVisitor
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return MalignmarkVisitor(self.strategy).visit(child)
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elif tag == 'mlabeledtr':
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from .mlabeledtr_visitor import MlabeledtrVisitor
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return MlabeledtrVisitor(self.strategy).visit(child)
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else:
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# Fallback: return text content for unknown elements
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import sys
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print(f"[WARNING] Unknown element <{tag}> in mroot, using text fallback", file=sys.stderr)
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return _text_content(child)
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def _brace(self, content: str) -> str:
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"""Wrap content in braces."""
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return f"{{{content}}}"
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def can_handle(self, node: ET.Element) -> bool:
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"""Check if this visitor can handle the given node."""
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return _local(node.tag) == 'mroot'
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@property
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def element_name(self) -> str:
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"""Get the element name this visitor handles."""
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return 'mroot'
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def __repr__(self) -> str:
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"""String representation for debugging."""
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return f"MrootVisitor(strategy={self.strategy.name})"
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