diff options
Diffstat (limited to 'lab04/ui.c')
| -rw-r--r-- | lab04/ui.c | 96 |
1 files changed, 91 insertions, 5 deletions
@@ -55,7 +55,7 @@ struct ui_state { bool poly_list_result_valid; struct expression_context expression; - char expression_text[256]; + char expression_text[EXPRESSION_TEXT_MAX]; double expression_result; bool expression_result_valid; @@ -1340,6 +1340,7 @@ static const char *ui_expression_error_text(enum expression_error_code code) case EXPRESSION_UNKNOWN_VARIABLE: return "变量不存在"; case EXPRESSION_UNSET_VARIABLE: return "变量尚未赋值"; case EXPRESSION_DIVISION_BY_ZERO: return "除数不能为零"; + case EXPRESSION_UNKNOWN_FUNCTION: return "函数不存在"; default: return "表达式错误"; } } @@ -1347,9 +1348,10 @@ static const char *ui_expression_error_text(enum expression_error_code code) static void ui_draw_expression(const struct ui_state *state, size_t selected) { static const char *const items[] = { - "输入新表达式", + "输入表达式或 DEF/RUN 命令", "修改变量值", "计算表达式", + "查看并运行历史函数", }; tui_clear(); @@ -1369,18 +1371,43 @@ static void ui_draw_expression(const struct ui_state *state, size_t selected) printf("\n" COLOR_CYAN "计算结果：" STYLE_RESET "\n"); if (state->expression_result_valid) printf(" %g\n", state->expression_result); else printf(" （未计算）\n"); - ui_print_menu(items, 3, selected, "返回"); + ui_print_menu(items, 4, selected, "返回"); ui_print_status(state); ui_print_footer("↑/↓ 或 j/k 选择 Enter 确认 q/Esc 返回"); fflush(stdout); } +static void ui_expression_calculate(struct ui_state *state); + static void ui_expression_input(struct ui_state *state) { char input[sizeof(state->expression_text)]; - if (!ui_prompt_inline("输入新表达式", "例如：3+4*X2-2*(20-5*2)", + if (!ui_prompt_inline("输入表达式或命令", + "例如：X2^2 或 DEF f(x)=x<=1?1:x*f(x-1); 或 RUN f(5);", input, sizeof(input))) return; struct expression_error error; + const char *text = ui_skip_space(input); + if (strncmp(text, "DEF", 3) == 0 && + !expression_name_char((unsigned char)text[3])) { + if (!expression_define(&state->expression, text, &error)) { + ui_set_status(state, "错误：%s（位置 %zu）", + ui_expression_error_text(error.code), error.position); + return; + } + const struct expression_function *function = + vec_back_const(&state->expression.functions); + ui_set_status(state, "已定义函数 %s(%s)，历史记录 %zu", + function->name, function->parameter, state->expression.functions.size); + return; + } + bool run = strncmp(text, "RUN", 3) == 0 && + !expression_name_char((unsigned char)text[3]); + if (run) text = ui_skip_space(text + 3); + size_t length = strlen(text); + while (length > 0 && isspace((unsigned char)text[length - 1])) --length; + if (length > 0 && text[length - 1] == ';') --length; + memmove(input, text, length); + input[length] = '\0'; if (!expression_collect_variables(&state->expression, input, &error)) { ui_set_status(state, "错误：%s（位置 %zu）", ui_expression_error_text(error.code), error.position); @@ -1389,6 +1416,7 @@ static void ui_expression_input(struct ui_state *state) strcpy(state->expression_text, input); state->expression_result_valid = false; ui_set_status(state, "已更新表达式"); + if (run) ui_expression_calculate(state); } static void ui_expression_set_variable(struct ui_state *state) @@ -1429,6 +1457,10 @@ static void ui_expression_calculate(struct ui_state *state) if (!expression_eval(&state->expression, state->expression_text, &state->expression_result, &error)) { state->expression_result_valid = false; + if (error.code == EXPRESSION_UNKNOWN_FUNCTION) { + state->expression_text[0] = '\0'; + vec_clear(&state->expression.variables); + } ui_set_status(state, "错误：%s（位置 %zu）", ui_expression_error_text(error.code), error.position); return; @@ -1437,6 +1469,57 @@ static void ui_expression_calculate(struct ui_state *state) ui_set_status(state, "计算完成"); } +static void ui_expression_history(struct ui_state *state) +{ + if (state->expression.functions.size == 0) { + ui_set_status(state, "尚未定义函数"); + return; + } + ui_clear_status(state); + for (;;) { + tui_clear(); + ui_print_header("函数定义历史"); + for (size_t i = 0; i < state->expression.functions.size; ++i) { + const struct expression_function *function = + vec_at_const(&state->expression.functions, i); + printf("%zu. %s(%s) = %s\n", i + 1, + function->name, function->parameter, function->body); + } + ui_print_status(state); + ui_print_footer("输入记录序号运行历史函数 Esc 返回"); + size_t choice; + if (!ui_read_size_value("运行历史函数", "记录序号：", &choice, state)) return; + if (choice == 0 || choice > state->expression.functions.size) { + ui_set_status(state, "错误：记录序号超出范围"); + continue; + } + const struct expression_function *function = + vec_at_const(&state->expression.functions, choice - 1); + char input[64]; + char description[128]; + snprintf(description, sizeof(description), "输入形参 %s 的值：", function->parameter); + if (!ui_prompt_inline("运行历史函数", description, input, sizeof(input))) return; + char *end; + errno = 0; + double argument = strtod(input, &end); + if (end == input || errno == ERANGE || *ui_skip_space(end) != '\0') { + ui_set_status(state, "错误：数值格式无效"); + continue; + } + double result; + struct expression_error error; + if (!expression_call(&state->expression, choice - 1, argument, &result, &error)) { + ui_set_status(state, "错误：%s（位置 %zu）", + ui_expression_error_text(error.code), error.position); + continue; + } + printf("\n" COLOR_GREEN "历史记录 %zu：%s(%g) = %g" STYLE_RESET "\n", + choice, function->name, argument, result); + tui_wait(); + ui_clear_status(state); + } +} + static void ui_expression_action(struct ui_state *state, int choice) { switch (choice) { @@ -1449,6 +1532,9 @@ static void ui_expression_action(struct ui_state *state, int choice) case 2: ui_expression_calculate(state); break; + case 3: + ui_expression_history(state); + break; default: break; } @@ -1459,7 +1545,7 @@ static void ui_expression_page(struct ui_state *state) size_t selected = 0; for (;;) { ui_draw_expression(state, selected); - int choice = ui_menu_input(&selected, 3); + int choice = ui_menu_input(&selected, 4); if (choice == -1) { return; } |