Readers in general de-linearize a linear text representation.
They transform it into a more structured representation.
| Description-Reader | Readers in general de-linearize a linear text representation. |
| One Step Reader | This kind of reader transforms a text file into a more structured memory representation in a single loop. |
| Streaming Reader | This kind of reader transforms a text file step by step. |
This kind of reader transforms a text file into a more structured memory representation in a single loop. You can think about reading an image file where the read RGBA pixel buffer is represented as a photo to the user.
─────────── data ╭──────────────╮ ◂ context information ╭───────────────────────╮
text file ────────▸│ A_reader_t ┼────────────────────────┼ memory representation │
─────────── ├──────────────┤ transformed data ▸ ╰───────────────────────╯
│ buffer │
╰──────────────╯This kind of reader transforms a text file step by step. It is possible that the reader loads the file in one step in an internal buffer to speed up the stream of reading requests.
The reader can also remember actual context information which depends ine the current reading position.
An example is a text reader which stores the line and column number of the last read text character. This kind of reader can also transform characters from one encoding into another.
─────────── data ╭──────────────╮ ◂ read next ╭───────────────────╮
text file ────────▸│ A_reader_t ┼────────────────────┼ another component │
─────────── ├──────────────┤ transformed data ▸ ╰───────────────────╯
│ buffer │ & current context
╰──────┬───────╯
change▾ │ ▴context
╭────────┴─────────╮
│ currrent context │
╰──────────────────╯