错误：在'{‘令牌之前预期’=’，’，’，’;’，’asm’或’__attribute__’
我正在开发一个解析文本文件的项目，该文件假设是一个简单的编码程序。 问题是，当我尝试编译程序时，我收到此错误：
In file included from driver.c:10: parser.c: In function 'Statement': parser.c:24: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token parser.c:153: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token parser.c:159: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token parser.c:167: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token parser.c:176: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token parser.c:185: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token parser.c:194: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token parser.c:201: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token parser.c:209: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token driver.c:19: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token driver.c:50: error: old-style parameter declarations in prototyped function definition driver.c:50: error: expected '{' at end of input 我不熟悉这个错误，不知道如何解决它。
这是我的parser.c文件，其中发生了错误：
#include #include #include "parser.h" AST_NODE* Program(AST_NODE* node); AST_NODE* Statement(AST_NODE* node) AST_NODE* AssignStmt(AST_NODE* node); AST_NODE* Print(AST_NODE *node); AST_NODE* Repeat(AST_NODE* node); AST_NODE* Exp(AST_NODE* node); AST_NODE* Factor(AST_NODE* node); AST_NODE* Term(AST_NODE* node); AST_NODE* parser(TOKEN* token,AST_NODE* node, FILE* input_file) { AST_NODE temp = malloc(sizeof(AST_NODE*)); if(token->type == Id) { temp-> tok = token; node -> child1 = temp; return node }else if(token->type == keyword) { if(strcmp(node->attribute, "print") == 0) { temp -> type = print; node -> child1 = temp; return node; } else if(strcmp(node->attribute, "repeat") == 0) { temp -> type = repeat; node -> child1 = temp; return node; } return node->prev; }else if(token->type == num) { temp->type = factor; temp->tok = token; AST_NODE temp2 = Exp(Term(temp)); node-> child3 = temp2 return node;//back to ID->term->exp then to either print repeat or assignment }else if(token->type == addOp) { temp-> tok = token; node-> child2 = temp; return node; }else if(token->type == multOp) { temp-> tok = token; node-> child2 = temp; return node; }else if(token->type == assignment) { temp->type = assignStmt; temp->tok = token; node->child2 = temp; return node; }else if(token->type == semicolon) { temp-> type = assignStmt; temp-> tok = token; if(node->type == keyword) { node->child3 = temp; }else { node->child4 = temp; } return node; }else if(token->type == lparen) { temp -> tok = token; if(node->type == repeat) node->child2 = temp; else node->child1 = temp; return node = node->prev; }else if(token->type == rparen) { temp -> tok = token; if(node->type == repeat) node->child4 = temp; else node->child3 = temp; return node; }else if(token->type == newLine) { while(node->type != program) { node = node->prev; } return node; }else{ if(token->type == Id) { AST_NODE temp2 = AssignStmt(Program(node)); temp->type = Id; temp->tok = token temp->prev = temp2; temp2-> child1 = temp; return temp2; }else if(strcmp(token->attribute,"print")) { AST_NODE temp2 = Print(Program(node)); temp->type = print; temp->tok = token temp->prev = temp2; temp2-> child1 = temp; return temp2; }else if(strcmp(token->attribute,"repeat")) { AST_NODE temp2 = Repeat(Program(node)); temp->type = repeat; temp->tok = token temp->prev = temp2; temp2-> child1 = temp; return temp2; } printf("error"); return NULL; } } AST_NODE* Program(AST_NODE* node) { node->type = program; Statement(node); return node; } AST_NODE* Statement(AST_NODE* node) { AST_NODE temp = malloc(sizeof(AST_NODE*)); temp-> type = statement; temp-> prev = node; node->child1-> temp; return temp; } AST_NODE* AssignStmt(AST_NODE* node) { AST_NODE temp = malloc(sizeof(AST_NODE*)); temp->type = assignStmt; temp-> prev = node; node->child1-> temp; return temp; } AST_NODE* Print(AST_NODE* node) { AST_NODE temp = malloc(sizeof(AST_NODE*)); temp->type = print; temp-> prev = node; node->child1-> temp; return node; } AST_NODE* Repeat(AST_NODE* node) { AST_NODE temp = malloc(sizeof(AST_NODE*)); temp->type = repeat; temp-> prev = node; node->child1-> temp; return node; } AST_NODE* Exp(AST_NODE* node) { AST_NODE temp = malloc(sizeof(AST_NODE*)); temp->type = exp; temp->child1-> node; return temp; } AST_NODE* factor(AST_NODE* node) { AST_NODE Temp = malloc(sizeof(AST_NODE*)); temp->type = factor; node->child1-> temp; return temp; } AST_NODE* Term(AST_NODE* node) { AST_NODE temp = malloc(sizeof(AST_NODE*)); temp->type = term; temp->child1-> node; return temp; }
这是我的driver.c文件，其中我也得到错误“原型函数定义中的旧式参数声明预期'{‘在输入结束时”。 这对我也很陌生。
#include #include "parser.c" #include "parser.h" AST_NODE* parser(TOKEN* token,AST_NODE node, FILE *input_file); int main(void) { TREE *current = 0; FILE *input_file = fopen("test.txt", "r"); TOKEN *token = (TOKEN*) malloc(sizeof(TOKEN)); TOKEN *tok = (TOKEN*) malloc(sizeof(TOKEN)); AST_NODE* node = malloc(sizeof(AST_NODE)); while(!feof(input_file)) { token = scan(input_file); if(token->type != null) { parser(token,node,input_file); printf("%s", token->attribute); if(token->checkR == ';') { tok->type = semicolon; tok->attribute = ";"; parser(tok,node,input_file); }if(token->checkR == ')') { tok->type = rparen; tok->attribute = ")"; parser(tok,node,input_file); } } } fclose(input_file); return 0; }
这是我的parser.h文件，我在其中声明我的TOKEN和我的AST_NODE来创建我的树并形成我的标记来填充树。
#ifndef _parser_h #define _parser_h typedef enum token_type { null, Id, keyword, num, addOp, multOp, assignment, semicolon, lparen, rparen, newLine }TOKEN_TYPE; typedef struct token{ int type; char *attribute; char checkR; }TOKEN; typedef enum node_type { program, statement, assignStmt, print, repeat, exp, factor, term }NODE_TYPE; typedef struct ast_node{ NODE_TYPE type; TOKEN *tok; struct AST_NODE *prev; struct AST_NODE *child1; struct AST_NODE *child2; struct AST_NODE *child3; struct AST_NODE *child4; struct AST_NODE *child5; }AST_NODE; #endif
还有一个名为scanner.c的文件，但我知道它的工作正常，因为我已经在所有可能的输入中测试了它并没有遇到任何问题。
如果有人可以提供帮助，我会非常感激。
AST_NODE* Statement(AST_NODE* node)
缺少一个分号（一个主要线索是错误信息“在函数’声明’：……”），第24行也是如此，
return node
（一旦你解决了这些问题，你会遇到其他问题，其中一些问题在这里被其他人提及。）
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你似乎包括来自花药的一个C文件。
#include通常只应与头文件一起使用。 -
在
struct ast_node的定义中，您可以引用struct AST_NODE，它不存在。 C区分大小写。
接近解析器function的末尾，你错过了’}’
函数声明中出现错误，请看下面的句子！你需要一个分号！
AST_NODE* Statement(AST_NODE* node)