同济大学计算机系课程《编译原理》大作业项目。包含词法分析器，LR1语法分析器。
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C99文法关于 if 语句的描述是有二义性的。ToyCompile LR1 分析器未对该情况做特殊处理。
例如：
if (a)
if (b)
c
else
d上方代码的 else，如果按照“移进”规则，会被判定为附属于第二个 if。这种理解是正确的。
但是，如果按照“归约”规则，else 会被分配给第一个 if，这是错误的。
文法分析过程，有两个项目会产生移进归约冲突。恰好产生“移进”命令的语句在后面，覆盖掉前面的指令，使得问题没有暴露。
应该采用一定手段处理这个问题，而不是依赖幸运的语句产生顺序。
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