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[DOC] Centerize Variable, English, and Constant columns
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Nobuyoshi Nakada
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2025-12-05 08:29:42 +00:00
@ -14,70 +14,70 @@ require 'English'
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### Exceptions
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| Variable | English | Contains |
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|-------------|-------------------|----------------------------------------------------|
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| `$!` | `$ERROR_INFO` | Exception object; set by Kernel#raise. |
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| `$@` | `$ERROR_POSITION` | Array of backtrace positions; set by Kernel#raise. |
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| Variable | English | Contains |
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|:--------:|:-----------------:|----------------------------------------------------|
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| `$!` | `$ERROR_INFO` | Exception object; set by Kernel#raise. |
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| `$@` | `$ERROR_POSITION` | Array of backtrace positions; set by Kernel#raise. |
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### Pattern Matching
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| Variable | English | Contains |
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|---------------|---------------------|--------------------------------------------------|
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| `$~` | `$LAST_MATCH_INFO` | MatchData object; set by matcher method. |
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| `$&` | `$MATCH` | Matched substring; set by matcher method. |
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| `` $` `` | `$PRE_MATCH` | Substring left of match; set by matcher method. |
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| `$'` | `$POST_MATCH` | Substring right of match; set by matcher method. |
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| `$+` | `$LAST_PAREN_MATCH` | Last group matched; set by matcher method. |
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| `$1` | | First group matched; set by matcher method. |
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| `$2` | | Second group matched; set by matcher method. |
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| Variable | English | Contains |
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|:-------------:|:-------------------:|--------------------------------------------------|
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| `$~` | `$LAST_MATCH_INFO` | MatchData object; set by matcher method. |
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| `$&` | `$MATCH` | Matched substring; set by matcher method. |
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| `` $` `` | `$PRE_MATCH` | Substring left of match; set by matcher method. |
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| `$'` | `$POST_MATCH` | Substring right of match; set by matcher method. |
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| `$+` | `$LAST_PAREN_MATCH` | Last group matched; set by matcher method. |
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| `$1` | | First group matched; set by matcher method. |
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| `$2` | | Second group matched; set by matcher method. |
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| <tt>$_n_</tt> | | <i>n</i>th group matched; set by matcher method. |
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### Separators
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| Variable | English | Contains |
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|----------|----------------------------|--------------------------------------------|
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| `$/` | `$INPUT_RECORD_SEPARATOR` | Input record separator; initially newline. |
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| `$\` | `$OUTPUT_RECORD_SEPARATOR` | Output record separator; initially `nil`. |
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| Variable | English | Contains |
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|:--------:|:--------------------------:|--------------------------------------------|
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| `$/` | `$INPUT_RECORD_SEPARATOR` | Input record separator; initially newline. |
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| `$\` | `$OUTPUT_RECORD_SEPARATOR` | Output record separator; initially `nil`. |
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### Streams
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| Variable | English | Contains |
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|-----------|-----------------------------|-----------------------------------------------|
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| Variable | English | Contains |
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|:---------:|:---------------------------:|-----------------------------------------------|
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| `$stdin` | | Standard input stream; initially `STDIN`. |
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| `$stdout` | | Standard input stream; initially `STDIOUT`. |
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| `$stderr` | | Standard input stream; initially `STDERR`. |
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| `$<` | `$DEFAULT_INPUT` | Default standard input; `ARGF` or `$stdin`. |
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| `$>` | `$DEFAULT_OUTPUT` | Default standard output; initially `$stdout`. |
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| `$.` | `$INPUT_LINE_NUMBER`, `$NR` | Input position of most recently read stream. |
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| `$_` | `$LAST_READ_LINE` | String from most recently read stream. |
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| `$<` | `$DEFAULT_INPUT` | Default standard input; `ARGF` or `$stdin`. |
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| `$>` | `$DEFAULT_OUTPUT` | Default standard output; initially `$stdout`. |
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| `$.` | `$INPUT_LINE_NUMBER`, `$NR` | Input position of most recently read stream. |
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| `$_` | `$LAST_READ_LINE` | String from most recently read stream. |
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### Processes
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| Variable | English | Contains |
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|---------------------------|-----------------------|--------------------------------------------------------|
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| `$0` | | Initially, the name of the executing program. |
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| `$*` | `$ARGV` | Points to the `ARGV` array. |
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| `$$` | `$PROCESS_ID`, `$PID` | Process ID of the current process. |
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| `$?` | `$CHILD_STATUS` | Process::Status of most recently exited child process. |
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| Variable | English | Contains |
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|:-------------------------:|:---------------------:|--------------------------------------------------------|
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| `$0` | | Initially, the name of the executing program. |
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| `$*` | `$ARGV` | Points to the `ARGV` array. |
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| `$$` | `$PROCESS_ID`, `$PID` | Process ID of the current process. |
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| `$?` | `$CHILD_STATUS` | Process::Status of most recently exited child process. |
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| `$LOAD_PATH`, `$:`, `$-I` | | Array of paths to be searched. |
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| `$LOADED_FEATURES`, `$"` | | Array of paths to loaded files. |
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### Debugging
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| Variable | English | Contains |
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|-------------|---------|--------------------------------------------------------|
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| Variable | English | Contains |
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|:-----------:|:-------:|--------------------------------------------------------|
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| `$FILENAME` | | The value returned by method ARGF.filename. |
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| `$DEBUG` | | Initially, whether option `-d` or `--debug` was given. |
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| `$DEBUG` | | Initially, whether option `-d` or `--debug` was given. |
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| `$VERBOSE` | | Initially, whether option `-V` or `-W` was given. |
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### Other Variables
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| Variable | English | Contains |
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|----------|---------|------------------------------------------------|
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| `$-a` | | Whether option `-a` was given. |
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| `$-i` | | Extension given with command-line option `-i`. |
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| `$-l` | | Whether option `-l` was given. |
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| `$-p` | | Whether option `-p` was given. |
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|:--------:|:-------:|------------------------------------------------|
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| `$-a` | | Whether option `-a` was given. |
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| `$-i` | | Extension given with command-line option `-i`. |
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| `$-l` | | Whether option `-l` was given. |
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| `$-p` | | Whether option `-p` was given. |
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## Exceptions
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@ -374,33 +374,33 @@ Whether command-line option `-p` was given; read-only.
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### Streams
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| Constant | Contains |
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|----------|-------------------------|
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|:--------:|-------------------------|
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| `STDIN` | Standard input stream. |
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| `STDOUT` | Standard output stream. |
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| `STDERR` | Standard error stream. |
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### Environment
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| Constant | Contains |
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|-----------------------|-------------------------------------------------------------------------------|
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| `ENV` | Hash of current environment variable names and values. |
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| `ARGF` | String concatenation of files given on the command line, or `$stdin` if none. |
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| `ARGV` | Array of the given command-line arguments. |
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| `TOPLEVEL_BINDING` | Binding of the top level scope. |
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| `RUBY_VERSION` | String Ruby version. |
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| `RUBY_RELEASE_DATE` | String Ruby release date. |
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| `RUBY_PLATFORM` | String Ruby platform. |
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| `RUBY_PATCH_LEVEL` | String Ruby patch level. |
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| `RUBY_REVISION` | String Ruby revision. |
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| `RUBY_COPYRIGHT` | String Ruby copyright. |
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| `RUBY_ENGINE` | String Ruby engine. |
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| Constant | Contains |
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|:---------------------:|-------------------------------------------------------------------------------|
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| `ENV` | Hash of current environment variable names and values. |
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| `ARGF` | String concatenation of files given on the command line, or `$stdin` if none. |
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| `ARGV` | Array of the given command-line arguments. |
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| `TOPLEVEL_BINDING` | Binding of the top level scope. |
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| `RUBY_VERSION` | String Ruby version. |
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| `RUBY_RELEASE_DATE` | String Ruby release date. |
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| `RUBY_PLATFORM` | String Ruby platform. |
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| `RUBY_PATCH_LEVEL` | String Ruby patch level. |
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| `RUBY_REVISION` | String Ruby revision. |
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| `RUBY_COPYRIGHT` | String Ruby copyright. |
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| `RUBY_ENGINE` | String Ruby engine. |
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| `RUBY_ENGINE_VERSION` | String Ruby engine version. |
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| `RUBY_DESCRIPTION` | String Ruby description. |
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| `RUBY_DESCRIPTION` | String Ruby description. |
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### Embedded Data
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| Constant | Contains |
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|----------|--------------------------------------------------------------------|
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|:--------:|--------------------------------------------------------------------|
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| `DATA` | File containing embedded data (lines following `__END__`, if any). |
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## Streams
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