math_cms/resources/views/components/exam/paper-body.blade.php

@php
    $choiceQuestions = $questions['choice'] ?? [];
    $fillQuestions = $questions['fill'] ?? [];
    $answerQuestions = $questions['answer'] ?? [];
    $gradingMode = $grading ?? false;

    // 是否在题干后显示题目ID (Q000123)
    $showQuestionId = config('exam.show_question_id_in_pdf', false);

    // 格式化题目ID为6位补0格式
    $formatQuestionId = function($id) {
        if (empty($id)) return '';
        return '(Q' . str_pad($id, 6, '0', STR_PAD_LEFT) . ')';
    };

    // 【新增】动态计算大题号 - 根据有题目的题型分配序号
    $sectionNumbers = [
        'choice' => null,
        'fill' => null,
        'answer' => null
    ];
    $currentSectionNumber = 1;

    // 只给有题目的题型分配序号
    if (!empty($choiceQuestions)) {
        $sectionNumbers['choice'] = $currentSectionNumber++;
    }
    if (!empty($fillQuestions)) {
        $sectionNumbers['fill'] = $currentSectionNumber++;
    }
    if (!empty($answerQuestions)) {
        $sectionNumbers['answer'] = $currentSectionNumber++;
    }

    // 获取题型名称的辅助函数
    $getSectionTitle = function($type, $sectionNumber) {
        $typeNames = [
            'choice' => '选择题',
            'fill' => '填空题',
            'answer' => '解答题'
        ];
        // 将数字转换为中文数字
        $chineseNumbers = ['', '一', '二', '三', '四', '五', '六', '七', '八', '九', '十'];
        $chineseNumber = $chineseNumbers[$sectionNumber] ?? (string)$sectionNumber;
        return $chineseNumber . '、' . $typeNames[$type];
    };

    // 检查是否有数学公式处理标记，避免重复处理
    $mathProcessed = false;
    // 检查所有题型中是否有任何题目包含 math_processed 标记
    foreach ([$choiceQuestions, $fillQuestions, $answerQuestions] as $questionType) {
        foreach ($questionType as $q) {
            if (isset($q->math_processed) && $q->math_processed) {
                $mathProcessed = true;
                break 2; // 找到标记就退出两层循环
            }
        }
    }

    // 计算填空空格数量
    $countBlanks = function($text) {
        $count = 0;
        $count += preg_match_all('/_{2,}/u', $text, $m);
        $count += preg_match_all('/（\s*）/u', $text, $m);
        $count += preg_match_all('/\(\s*\)/', $text, $m);
        return max(1, $count);
    };

    // 计算步骤数量
    $countSteps = function($text) {
        $matches = [];
        $cnt = preg_match_all('/第\s*\d+\s*步/u', $text ?? '', $matches);
        return max(1, $cnt);
    };

    $renderBoxes = function($num) {
        // 判卷方框放大 1.2 倍，保持单行布局
        if ($num == 2) {
            // 两个方框时，使用右对齐布局
            return '<div style="display:flex;justify-content:flex-end;gap:4px;">' .
                   str_repeat('<span style="display:inline-block;width:17px;height:17px;line-height:17px;border:1px solid #333;"></span>', $num) .
                   '</div>';
        }
        return str_repeat('<span style="display:inline-block;width:17px;height:17px;line-height:17px;border:1px solid #333;margin-right:4px;vertical-align:middle;"></span>', $num);
    };
@endphp

{{-- 【新增】步骤方框CSS样式 --}}
<style>
.solution-step {
    display: block;
    margin: 8px 0;
    padding: 4px 0;
}

.step-box {
    display: inline-block;
    margin-right: 8px;
    vertical-align: middle;
}

.step-label {
    white-space: normal;
    vertical-align: middle;
}

.solution-section {
    margin: 10px 0;
    padding: 8px;
    background-color: #f9f9f9;
}
</style>

<!-- 动态大题号 - 选择题 -->
@if($sectionNumbers['choice'] !== null)
<div class="section-title">{{ $getSectionTitle('choice', $sectionNumbers['choice']) }}
    @if(count($choiceQuestions) > 0)
        @php
            $choiceTotal = array_sum(array_map(fn($q) => $q->score ?? 5, $choiceQuestions));
        @endphp
        （本大题共 {{ count($choiceQuestions) }} 小题，共 {{ $choiceTotal }} 分）
    @else
        （本大题共 0 小题，共 0 分）
    @endif
</div>
@if(count($choiceQuestions) > 0)
    @foreach($choiceQuestions as $index => $q)
        @php
            // 【修复】使用question_number字段作为显示序号，确保全局序号一致性
            $questionNumber = $q->question_number ?? ($index + 1);
            $cleanContent = preg_replace('/^\d+[\.、]\s*/', '', $q->content);
            $cleanContent = trim($cleanContent);
            $options = $q->options ?? [];
            if (empty($options)) {
                // 【修复】选项标记必须在行首或空白后，避免误匹配 SVG 注释中的 BD:DC 等内容
                $pattern = '/(?:^|\s)([A-D])[\.、：．:]\s*(.+?)(?=(?:^|\s)[A-D][\.、：．:]|$)/su';
                if (preg_match_all($pattern, $cleanContent, $matches, PREG_SET_ORDER)) {
                    foreach ($matches as $match) {
                        $optionText = trim($match[2]);
                        if (!empty($optionText)) {
                            $options[] = $optionText;
                        }
                    }
                }
            }
            $stemLine = $cleanContent;
            if (!empty($options)) {
                // 【修复】只匹配行首或空白后的选项标记，避免误匹配 SVG 注释中的 BD:DC 等内容
                if (preg_match('/^(.+?)(?=(?:^|\s)[A-D][\.、：．:])/su', $cleanContent, $stemMatch)) {
                    $stemLine = trim($stemMatch[1]);
                }
            }
            // 将题干中的空括号/下划线替换为短波浪线；如无占位符，则在末尾追加短波浪线
            $blankSpan = '<span style="display:inline-block; min-width:80px; border-bottom:1.2px dashed #444; vertical-align:bottom;">&nbsp;</span>';
            // 【修复】扩展下划线转换规则，支持LaTeX格式和多种占位符
            $renderedStem = $stemLine;
            // 先处理LaTeX格式的underline命令
            $renderedStem = preg_replace('/\\\underline\{[^}]*\}/', $blankSpan, $renderedStem);
            $renderedStem = preg_replace('/\\\qquad+/', $blankSpan, $renderedStem);
            // 【修复】在处理填空占位符时，保护LaTeX公式不被破坏
            // 先标记LaTeX公式区域
            $latexPlaceholders = [];
            $counter = 0;
            $renderedStem = preg_replace_callback('/\$[^$]+\$/u', function($matches) use (&$latexPlaceholders, &$counter, $blankSpan) {
                $placeholder = '<<<LATEX_' . $counter . '>>>';
                $latexPlaceholders[$placeholder] = $matches[0];
                $counter++;
                return $placeholder;
            }, $renderedStem);

            // 现在处理普通占位符（不会破坏LaTeX公式）
            $renderedStem = preg_replace(['/（\s*）/u', '/\(\s*\)/', '/_{2,}/'], $blankSpan, $renderedStem);

            // 恢复LaTeX公式（并进行HTML实体编码防止被浏览器解析）
            foreach ($latexPlaceholders as $placeholder => $latexContent) {
                $encodedLatex = htmlspecialchars($latexContent, ENT_QUOTES | ENT_HTML5, 'UTF-8');
                $renderedStem = str_replace($placeholder, $encodedLatex, $renderedStem);
            }

            // 如果没有占位符，在末尾添加
            if ($renderedStem === $stemLine) {
                $renderedStem .= ' ' . $blankSpan;
            }
            $renderedStem = $mathProcessed ? $renderedStem : \App\Services\MathFormulaProcessor::processFormulas($renderedStem);
        @endphp
        <div class="question">
            <div class="question-grid">
                <div class="question-lead">
                    @if($gradingMode)
                        <span class="grading-boxes">{!! $renderBoxes(1) !!}</span>
                    @endif
                    <span class="question-number">{{ $gradingMode ? '题目 ' : '' }}{{ $questionNumber }}.</span>
                </div>
                <div class="question-main">
                    <span class="question-stem">{!! $renderedStem !!}</span>
                    @if($showQuestionId && !empty($q->id))
                        <span class="question-id" style="font-size:10px;color:#999;margin-left:4px;">{!! $formatQuestionId($q->id) !!}</span>
                    @endif
                </div>
                @if(!empty($options))
                    @php
                        // 计算选项长度并动态选择布局
                        $optCount = count($options);
                        $maxOptionLength = 0;
                        foreach ($options as $opt) {
                            $optText = strip_tags(\App\Services\MathFormulaProcessor::processFormulas($opt));
                            $maxOptionLength = max($maxOptionLength, mb_strlen($optText, 'UTF-8'));
                        }

                        // 根据最长选项长度和选项数量动态选择布局
                        // 短选项(≤15字符)且选项数≤4：4列布局
                        // 中等选项(16-30字符)或选项数>4：2列布局
                        // 长选项(>30字符)：1列布局
                        if ($maxOptionLength <= 15 && $optCount <= 4) {
                            $optionsClass = 'options-grid-4';
                            $layoutDesc = '4列布局';
                        } elseif ($maxOptionLength <= 30) {
                            $optionsClass = 'options-grid-2';
                            $layoutDesc = '2列布局';
                        } else {
                            $optionsClass = 'options-grid-1';
                            $layoutDesc = '1列布局';
                        }

                        \Illuminate\Support\Facades\Log::debug('选择题布局决策', [
                            'question_number' => $questionNumber,
                            'opt_count' => $optCount,
                            'max_length' => $maxOptionLength,
                            'selected_class' => $optionsClass,
                            'layout' => $layoutDesc
                        ]);
                    @endphp
                    <div class="question-lead spacer"></div>
                    <div class="{{ $optionsClass }}">
                        @foreach($options as $optIndex => $opt)
                            @php
                                // 兼容两种格式：数字索引 (0,1,2,3) 或字母键 (A,B,C,D)
                                if (is_numeric($optIndex)) {
                                    $label = chr(65 + (int)$optIndex);
                                } else {
                                    $label = strtoupper($optIndex);
                                }
                                // 对LaTeX公式中的特殊字符进行HTML实体编码，防止被浏览器当作HTML标签处理
                                $encodedOpt = htmlspecialchars($opt, ENT_QUOTES | ENT_HTML5, 'UTF-8');
                                $renderedOpt = $mathProcessed ? $encodedOpt : \App\Services\MathFormulaProcessor::processFormulas($encodedOpt);
                            @endphp
                            <div class="option option-compact">
                                <strong>{{ $label }}.</strong>&nbsp;{!! $renderedOpt !!}
                            </div>
                        @endforeach
                    </div>
                @endif
                @if($gradingMode)
                    @php
                        $solutionText = trim($q->solution ?? '');
                        // 去掉前置的"解题思路"标签，避免出现"解题思路：【解题思路】"重复
                        $solutionText = preg_replace('/^【?\s*解题思路\s*】?\s*[:：]?\s*/u', '', $solutionText);
                        $solutionHtml = $solutionText === ''
                            ? '<span style="color:#999;font-style:italic;">（暂无解题思路）</span>'
                            : ($mathProcessed ? $solutionText : \App\Services\MathFormulaProcessor::processFormulas($solutionText));
                    @endphp
                    <div class="question-lead spacer"></div>
                    <div class="answer-meta">
                        <div class="answer-line"><strong>正确答案：</strong><span class="solution-content">{!! $mathProcessed ? ($q->answer ?? '') : \App\Services\MathFormulaProcessor::processFormulas($q->answer ?? '') !!}</span></div>
                        <div class="answer-line"><strong>解题思路：</strong><span class="solution-content">{!! $solutionHtml !!}</span></div>
                    </div>
                @endif
            </div>
        </div>
    @endforeach
@else
    <div class="question">
        <div class="question-content" style="font-style: italic; color: #999; padding: 20px; border: 1px dashed #ccc; background: #f9f9f9;">
            该题型正在生成中或暂无题目，请稍后刷新页面查看
        </div>
    </div>
@endif
@endif

<!-- 动态大题号 - 填空题 -->
@if($sectionNumbers['fill'] !== null)
<div class="section-title">{{ $getSectionTitle('fill', $sectionNumbers['fill']) }}
    @if(count($fillQuestions) > 0)
        @php
            $fillTotal = array_sum(array_map(fn($q) => $q->score ?? 5, $fillQuestions));
        @endphp
        （本大题共 {{ count($fillQuestions) }} 小题，共 {{ $fillTotal }} 分）
    @else
        （本大题共 0 小题，共 0 分）
    @endif
</div>
@if(count($fillQuestions) > 0)
    @foreach($fillQuestions as $index => $q)
        @php
            // 【修复】使用question_number字段作为显示序号，确保全局序号一致性
            $questionNumber = $q->question_number ?? (count($choiceQuestions) + $index + 1);
            $blankSpan = '<span style="display:inline-block; min-width:80px; border-bottom:1.2px dashed #444; vertical-align:bottom;">&nbsp;</span>';
            // 【修复】扩展下划线转换规则，支持LaTeX格式和多种占位符
            $renderedContent = $q->content;
            // 【修复】在处理填空占位符时，保护LaTeX公式不被破坏
            // 先标记LaTeX公式区域（支持包含反斜杠和花括号的LaTeX命令）
            $latexPlaceholders = [];
            $counter = 0;
            $renderedContent = preg_replace_callback('/\$(?:[^\$]|\\.)*\$/u', function($matches) use (&$latexPlaceholders, &$counter, $blankSpan) {
                $placeholder = '<<<LATEX_FILL_' . $counter . '>>>';
                $latexPlaceholders[$placeholder] = $matches[0];
                $counter++;
                return $placeholder;
            }, $renderedContent);

            // 现在处理普通占位符（不会破坏LaTeX公式）
            $renderedContent = preg_replace(['/（\s*）/u', '/\(\s*\)/', '/_{2,}/'], $blankSpan, $renderedContent);

            // 恢复LaTeX公式（并进行HTML实体编码防止被浏览器解析）
            foreach ($latexPlaceholders as $placeholder => $latexContent) {
                $encodedLatex = htmlspecialchars($latexContent, ENT_QUOTES | ENT_HTML5, 'UTF-8');
                $renderedContent = str_replace($placeholder, $encodedLatex, $renderedContent);
            }

            // 如果没有占位符且内容没有变化，在末尾添加
            // 但要检查是否已经有填空占位符（如\underline{\qquad}）
            if ($renderedContent === $q->content && !preg_match('/\\\\underline|\\\\qquad|（\s*）|\(\s*\)/', $renderedContent)) {
                $renderedContent .= ' ' . $blankSpan;
            }
            $renderedContent = $mathProcessed ? $renderedContent : \App\Services\MathFormulaProcessor::processFormulas($renderedContent);
        @endphp
        <div class="question">
            <div class="question-grid">
                <div class="question-lead">
                    @if($gradingMode)
                        <span class="grading-boxes">{!! $renderBoxes($countBlanks($q->content ?? '')) !!}</span>
                    @endif
                    <span class="question-number">{{ $gradingMode ? '题目 ' : '' }}{{ $questionNumber }}.</span>
                </div>
                <div class="question-main">
                    <span class="question-stem">{!! $renderedContent !!}</span>
                    @if($showQuestionId && !empty($q->id))
                        <span class="question-id" style="font-size:10px;color:#999;margin-left:4px;">{!! $formatQuestionId($q->id) !!}</span>
                    @endif
                </div>
                @if($gradingMode)
                    @php
                        $solutionText = trim($q->solution ?? '');
                        // 去掉前置的"解题思路"标签，避免出现"解题思路：【解题思路】"重复
                        $solutionText = preg_replace('/^【?\s*解题思路\s*】?\s*[:：]?\s*/u', '', $solutionText);
                        $solutionHtml = $solutionText === ''
                            ? '<span style="color:#999;font-style:italic;">（暂无解题思路）</span>'
                            : ($mathProcessed ? $solutionText : \App\Services\MathFormulaProcessor::processFormulas($solutionText));
                    @endphp
                    <div class="question-lead spacer"></div>
                    <div class="answer-meta">
                        <div class="answer-line"><strong>正确答案：</strong><span class="solution-content">{!! $mathProcessed ? ($q->answer ?? '') : \App\Services\MathFormulaProcessor::processFormulas($q->answer ?? '') !!}</span></div>
                        <div class="answer-line"><strong>解题思路：</strong><span class="solution-content">{!! $solutionHtml !!}</span></div>
                    </div>
                @endif
            </div>
        </div>
    @endforeach
@else
    <div class="question">
        <div class="question-content" style="font-style: italic; color: #999; padding: 20px; border: 1px dashed #ccc; background: #f9f9f9;">
            该题型正在生成中或暂无题目，请稍后刷新页面查看
        </div>
    </div>
@endif
@endif

<!-- 动态大题号 - 解答题 -->
@if($sectionNumbers['answer'] !== null)
<div class="section-title">{{ $getSectionTitle('answer', $sectionNumbers['answer']) }}
    @if(count($answerQuestions) > 0)
        （本大题共 {{ count($answerQuestions) }} 小题，共 {{ array_sum(array_column($answerQuestions, 'score')) }} 分。解答应写出文字说明、证明过程或演算步骤）
    @else
        （本大题共 0 小题，共 0 分）
    @endif
</div>
@if(count($answerQuestions) > 0)
    @foreach($answerQuestions as $index => $q)
        @php
            // 【修复】使用question_number字段作为显示序号，确保全局序号一致性
            $questionNumber = $q->question_number ?? (count($choiceQuestions) + count($fillQuestions) + $index + 1);
        @endphp
        <div class="question">
            <div class="question-grid">
                <div class="question-lead">
                    <span class="question-number">{{ $gradingMode ? '题目 ' : '' }}{{ $questionNumber }}.</span>
                </div>
                <div class="question-main">
                    @unless($gradingMode)
                        <span class="question-score-inline">（本小题满分 {{ $q->score ?? 10 }} 分）</span>
                    @endunless
                    <span class="question-stem">{!! $mathProcessed ? $q->content : \App\Services\MathFormulaProcessor::processFormulas($q->content) !!}</span>
                    @if($showQuestionId && !empty($q->id))
                        <span class="question-id" style="font-size:10px;color:#999;margin-left:4px;">{!! $formatQuestionId($q->id) !!}</span>
                    @endif
                </div>
                @unless($gradingMode)
                    <div class="question-lead spacer"></div>
                    <div class="answer-area boxy">
                        <span class="answer-label">作答</span>
                    </div>
                @endunless
                @if($gradingMode)
                    @php
                        $solutionRaw = $q->solution ?? '';
                        $solutionProcessed = $mathProcessed ? $solutionRaw : \App\Services\MathFormulaProcessor::processFormulas($solutionRaw);
                        // 去掉分步得分等分值标记
                        $solutionProcessed = preg_replace('/（\s*\d+\s*分\s*）/u', '', $solutionProcessed);

                        // 【修复】优化解析分段格式 - 支持两种格式：
                        // 1. 【解题思路】格式
                        // 2. 解题过程：格式

                        // 先处理【】格式
                        $solutionProcessed = preg_replace('/【(解题思路|详细解答|最终答案)】/u', "\n\n===SECTION_START===\n【$1】\n===SECTION_END===\n\n", $solutionProcessed);

                        // 【扩展】处理多种"解题过程"格式，包括带括号的内容
                        $solutionProcessed = preg_replace('/(解题过程\s*[^：\n]*：)/u', "\n\n===SECTION_START===\n【解题过程】\n===SECTION_END===\n\n", $solutionProcessed);

                        // 按section分割内容
                        $sections = explode('===SECTION_START===', $solutionProcessed);
                        $processedSections = [];

                        foreach ($sections as $section) {
                            if (empty(trim($section))) continue;

                            // 去掉结尾标记
                            $section = str_replace('===SECTION_END===', '', $section);

                            // 检查是否是解题相关部分
                            if (preg_match('/【(解题思路|详细解答|最终答案|解题过程)】/u', $section, $matches)) {
                                $sectionTitle = $matches[0];
                                $sectionContent = preg_replace('/【(解题思路|详细解答|最终答案|解题过程)】/u', '', $section);

                                // 【修复】处理步骤 - 在每个"步骤N"或"第N步"前添加方框
                                // 【优化】使用split分割步骤，为所有步骤添加方框（包括第一个）
                                if (preg_match('/(步骤\s*\d+|第\s*\d+\s*步)/u', $sectionContent)) {
                                    // 使用前瞻断言分割，保留分隔符
                                    $allSteps = preg_split('/(?=步骤\s*\d+|第\s*\d+\s*步)/u', $sectionContent, -1, PREG_SPLIT_NO_EMPTY);

                                    if (count($allSteps) > 0) {
                                        $processed = '';
                                        // 为每个步骤添加方框（包括第一个）
                                        for ($i = 0; $i < count($allSteps); $i++) {
                                            $stepText = trim($allSteps[$i]);
                                            if (!empty($stepText)) {
                                                // 为每个步骤添加方框和换行（第一个步骤前面不加<br>）
                                                $prefix = ($i > 0) ? '<br>' : '';
                                                $processed .= $prefix . '<span class="solution-step"><span class="step-box">' . $renderBoxes(1) . '</span><span class="step-label">' . $stepText . '</span></span>';
                                            }
                                        }
                                        $sectionContent = $processed;
                                    }
                                } else {
                                    // 没有明确步骤：在标题后添加一个方框作为开始
                                    $sectionContent = '<span class="solution-step"><span class="step-box">' . $renderBoxes(1) . '</span><span class="step-label">&nbsp;</span></span> ' . trim($sectionContent);
                                }

                                // 包装section
                                $processedSections[] = '<div class="solution-section"><strong>' . $sectionTitle . '</strong><br>' . $sectionContent . '</div>';
                            } else {
                                // 非解题部分直接保留
                                $processedSections[] = $section;
                            }
                        }

                        // 重新组合所有部分
                        $solutionProcessed = implode('', $processedSections);

                        // 将多余的换行转换为<br>，但保留合理的段落间距
                        $solutionProcessed = preg_replace('/\n{3,}/u', "\n\n", $solutionProcessed);
                        $solutionProcessed = nl2br($solutionProcessed);
                    @endphp
                    <div class="question-lead spacer"></div>
                    <div class="answer-meta">
                        <div class="answer-line"><strong>正确答案：</strong><span class="solution-content">{!! $mathProcessed ? ($q->answer ?? '') : \App\Services\MathFormulaProcessor::processFormulas($q->answer ?? '') !!}</span></div>
                        <div class="answer-line solution-parsed">{!! $solutionProcessed !!}</div>
                    </div>
                @endif
            </div>
        </div>
    @endforeach
@else
    <div class="question">
        <div class="question-content" style="font-style: italic; color: #999; padding: 20px; border: 1px dashed #ccc; background: #f9f9f9;">
            该题型正在生成中或暂无题目，请稍后刷新页面查看
        </div>
    </div>
@endif
@endif