1.7.2 函数好了

CrossDown/Core.py

@@ -31,9 +31,8 @@ Extensions = {
 }
 
 try:  # 检测当前平台是否支持扩展语法
-    import Extra
+    from .Extra import *
-
+    EXTRA_ABLE = True
-    Extensions += Extra.EXTRA
 except ModuleNotFoundError:
     EXTRA_ABLE = False
 
@@ -206,9 +205,20 @@ class CodeLine(Treeprocessor):
                         elem.remove(code)
                     elif re.match(r'¥[^$]*¥', code.text):  # 是数学函数(单行)
                         if EXTRA_ABLE:
-                            expression, range_ = re.findall(r'¥([^$]*)¥(€[^$]*€)?', code)[0]  # 分离表达式与范围(如果有)
+                            expression, range_ = re.findall(r'¥([^$]*)¥(€[^$]*€)?', code.text)[0]  # 分离表达式与范围(如果有)
                             x_r = (-10, 10)
                             y_r = (-20, 20)
+                            if range_ != '':  # 定义了范围
+                                ranges = range_[1:-1].split('|')
+                                if len(ranges) in (1, 2):  # 定义的范围正确
+                                    x_r = tuple(int(i) for i in ranges[0].split(','))
+                                    if len(ranges) == 2:  # 定义了y范围
+                                        y_r = tuple(int(i) for i in ranges[1].split(','))
+                            code.tag = 'img'
+                            code.set('src', f"""data:image/png;base64,{(function_drawing(
+                                function=lambda x: eval(expression.split('=')[1]), x_range=x_r, y_range=y_r
+                            ))}""")  # 绘制函数图像
+                            code.set('alt', 'Base64 函数图片')
                     elif re.match(r'\{[^$]*}', code.text):  # 是强调
                         code.tag = 'span'
                         code.set('class', 'block')

CrossDown/Extra.py

@@ -1,3 +1,43 @@
+import matplotlib.pyplot as plt
+import numpy as np
+import base64
+from io import BytesIO
+
+
 EXTRA = [
 
 ]
+
+
+def function_drawing(function, x_range=(-10, 10), y_range=(-20, 20), dpi=100):
+    # 创建一个图像和坐标轴对象
+    fig, ax = plt.subplots()
+
+    # 生成x值
+    x = np.linspace(x_range[0], x_range[1], 400)
+
+    # 计算y值
+    y = function(x)
+
+    # 绘制图像
+    ax.plot(x, y)
+
+    # 设置坐标轴范围
+    ax.set_xlim(x_range)
+    ax.set_ylim(y_range)
+
+    # 隐藏坐标轴
+    ax.axis('on')
+
+    # 将图像保存到BytesIO对象
+    buf = BytesIO()
+    fig.savefig(buf, format='png', dpi=dpi)
+
+    # 获取图像数据的Base64编码
+    data = base64.b64encode(buf.getbuffer()).decode("ascii")
+
+    # 关闭图像和坐标轴对象
+    plt.close(fig)
+
+    # 返回Base64编码的字符串
+    return data