多个单字符选项可以合并,例如下面俩个命令作用等同。 $ruby -ne 'print if /Ruby/' /usr/share/bin $ruby -n -e 'print if /Ruby/' /usr/share/bin 2.3Ruby环境变量 Unix/linux, 可以查看.env文件查看环境变量。 编辑器: ubuntu 18 下我用nano. 也安装了Visual Studio Code。 任何你顺手的编辑器都可...
例如 mruby 中创建了表示语法结构的树结构,并传递给后续的代码生成处理。我们来看一个创建树结构的例子:将 mruby 的if语句转换为图 1-10 中的S表达式(本质是结构体的链接)。 # 将如下的Ruby程序 if cond puts "true" else puts "false" end 1. 2. 3. 4. 5. 6. 转换为如下的S表达式 (if (lvar co...
为什么多行条件语句中'else'之后的代码被认为是有效的Ruby语法？使用显式换行符时可能会更明显。您的第...
DState **dp, *d;staticDState *alldstates;qsort(l->s, l->n, sizeof l->s[0], ptrcmp);/* look in tree for existing DState */dp = &alldstates;while((d = *dp) != NULL){ i =listcmp(l, &d->l);if(i <0) dp = &d->left;elseif(i >0) dp = &d->right;elsereturn...
If len is less than the old length the content beyond len bytes is discarded, else if len is greater than the old length the content beyond the old length bytes will not be preserved but will be garbage. Note that RSTRING_PTR(str) may change by calling this function. rb_str_set_len...
# bad - pretty convoluted=year..1909then'Ragtime'when1910..1929then'New Orleans Jazz'when1930..1939then'Swing'when1940..1950then'Bebop'else'Jazz'endresult=ifsome_condcalc_somethingelsecalc_something_elseend# good - it's apparent what's going onkind=caseyearwhen1850..1889then'Blues'when1890...
Format all Ruby code using Syntax Tree 1年前 lib Format all Ruby code using Syntax Tree 1年前 spec Format all Ruby code using Syntax Tree 1年前 templates adding note to player README saying to run rubywarrior command again w… 15年前 ...
So, as a general principle, only build DSLs if you, other developers, or the end users of your application will be getting a lot of use out of them. If you do create a DSL, make sure to include a comprehensive test suite with it, as well as properly document its syntax as it can...
If-else While it makes no real difference to the machine, using double negation in alternatives has the same effect as in text - it makes the point difficult to grasp. Blocks Ruby blocks can use either do... end or {} (their only difference lies in theirprecedence order). Both are fin...
if(l oldl || strncasecmpoldp,s, l) != 0) { s; } if(l+ newl - oldl > STATIC_FILE_LENGTH || newl > STATIC__LENGTH){ rb_fatal("malformed RUBYLIB_PREFIX"); } strcpy(ret + newl, s + oldl); return ret; } #else #define ruby_(s, l) (s...