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api:buffer [2016/06/19 05:58] payonel [Instance Methods] |
api:buffer [2016/06/19 07:56] (current) payonel [Instance Methods] |
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| - `b:lines([line_formats...]) string array` | - `b:lines([line_formats...]) string array` | ||
| - | Returns a function iterator which reads from the stream until it reaches nil. On each read, the `line_formats` list of args ais passed to `stream:read(...)`. The overwhelmingly typical use is to not define `line_formats`, i.e. passing no args to `lines()`. The default behavior (i..e without `line_formats`) is to read a "line" at a time from the stream. | + | Returns a function iterator which reads from the stream until it reaches nil. On each read, the `line_formats` list of args as passed to `stream:read(...)`. The overwhelmingly typical use is to not define `line_formats`, i.e. passing no args to `lines()`. The default behavior (i..e without `line_formats`) is to read a "line" at a time from the stream. |
| ```lua | ```lua | ||
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| * a number value, e.g. `10` | * a number value, e.g. `10` | ||
| - | Read **n** chars from the stream, result is a string. | + | Read **n** bytes (in binary mode) or chars (in text mode) from the stream; result is returned as a string. See [[api:non-standard-lua-libs#input_and_output_facilities|io.open]] for more details about how to open files in different modes. |
| `local chars = b:read(10)` | `local chars = b:read(10)` | ||
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| * "\*n" or "\*number" | * "\*n" or "\*number" | ||
| - | Read the next series of bytes from the stream and that can be interpreted as a number | + | Read the next series of bytes from the stream that can be interpreted as a number. Note that reading numbers is also affected by the open mode, binary or text. See [[api:non-standard-lua-libs#input_and_output_facilities|io.open]] for more details about how to open files in different modes.. |
| `local number = b:read("*n")` | `local number = b:read("*n")` | ||
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| - `read(n: number) ok, reason` | - `read(n: number) ok, reason` | ||
| - | Return `n` unicode chars. The caller assumes there is more data to read until `nil` is returned. A empty string or a string shorter than `n` chars long is a valid return, but the caller may assume there is more data to request until `nil` is returned. | + | Return `n` bytes, and **not** `n` unicode-aware chars. Assume your data is binary data and let the buffer library manage the mode and the unicode string packaging (if applicable). Note that this is exactly how the [[api:filesystem|filesystem]] library operates.The caller assumes there is more data to read until `nil` is returned. A empty string or a string shorter than `n` chars long is a valid return, but the caller may assume there is more data to request until `nil` is returned. |
| - `seek([whence: string], [offset: number]) [offset from start] or falsey, reason` | - `seek([whence: string], [offset: number]) [offset from start] or falsey, reason` | ||