()
| 124 | } |
| 125 | |
| 126 | func (a *AST) parseFunCallerOrConst() ExprAST { |
| 127 | name := a.currTok.Tok |
| 128 | a.getNextToken() |
| 129 | // call func |
| 130 | if a.currTok.Tok == "(" { |
| 131 | f := FunCallerExprAST{} |
| 132 | if _, ok := defFunc[name]; !ok { |
| 133 | a.Err = errors.New( |
| 134 | fmt.Sprintf("function `%s` is undefined\n%s", |
| 135 | name, |
| 136 | ErrPos(a.source, a.currTok.Offset))) |
| 137 | return f |
| 138 | } |
| 139 | a.getNextToken() |
| 140 | exprs := make([]ExprAST, 0) |
| 141 | if a.currTok.Tok == ")" { |
| 142 | // function call without parameters |
| 143 | // ignore the process of parameter resolution |
| 144 | } else { |
| 145 | exprs = append(exprs, a.ParseExpression()) |
| 146 | for a.currTok.Tok != ")" && a.getNextToken() != nil { |
| 147 | if a.currTok.Type == COMMA { |
| 148 | continue |
| 149 | } |
| 150 | exprs = append(exprs, a.ParseExpression()) |
| 151 | } |
| 152 | } |
| 153 | def := defFunc[name] |
| 154 | if def.argc >= 0 && len(exprs) != def.argc { |
| 155 | a.Err = errors.New( |
| 156 | fmt.Sprintf("wrong way calling function `%s`, parameters want %d but get %d\n%s", |
| 157 | name, |
| 158 | def.argc, |
| 159 | len(exprs), |
| 160 | ErrPos(a.source, a.currTok.Offset))) |
| 161 | } |
| 162 | a.getNextToken() |
| 163 | f.Name = name |
| 164 | f.Arg = exprs |
| 165 | return f |
| 166 | } |
| 167 | // call const |
| 168 | if v, ok := defConst[name]; ok { |
| 169 | return NumberExprAST{ |
| 170 | Val: v, |
| 171 | Str: strconv.FormatFloat(v, 'f', 0, 64), |
| 172 | } |
| 173 | } else { |
| 174 | a.Err = errors.New( |
| 175 | fmt.Sprintf("const `%s` is undefined\n%s", |
| 176 | name, |
| 177 | ErrPos(a.source, a.currTok.Offset))) |
| 178 | return NumberExprAST{} |
| 179 | } |
| 180 | } |
| 181 | |
| 182 | func (a *AST) parsePrimary() ExprAST { |
| 183 | switch a.currTok.Type { |
no test coverage detected