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feat: support decode nested types from string to values (#381)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,33 @@ | ||
| // Copyright 2021 Datafuse Labs | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| use std::io::Cursor; | ||
|
|
||
| pub trait ReadCheckPointExt { | ||
| fn checkpoint(&self) -> u64; | ||
| fn rollback(&mut self, checkpoint: u64); | ||
| } | ||
|
|
||
| impl<T> ReadCheckPointExt for Cursor<T> | ||
| where | ||
| T: AsRef<[u8]>, | ||
| { | ||
| fn checkpoint(&self) -> u64 { | ||
| self.position() | ||
| } | ||
|
|
||
| fn rollback(&mut self, checkpoint: u64) { | ||
| self.set_position(checkpoint) | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,171 @@ | ||
| // Copyright 2021 Datafuse Labs | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| use memchr::memchr; | ||
| use std::io::BufRead; | ||
| use std::io::Cursor; | ||
| use std::io::ErrorKind; | ||
| use std::io::Result; | ||
|
|
||
| pub trait ReadBytesExt { | ||
| fn peek(&mut self) -> Option<char>; | ||
| fn peek_byte(&mut self) -> Option<u8>; | ||
| fn ignore(&mut self, f: impl Fn(u8) -> bool) -> bool; | ||
| fn ignores(&mut self, f: impl Fn(u8) -> bool) -> usize; | ||
| fn ignore_byte(&mut self, b: u8) -> bool; | ||
| fn ignore_bytes(&mut self, bs: &[u8]) -> bool; | ||
| fn ignore_white_spaces(&mut self) -> bool; | ||
| fn until(&mut self, delim: u8, buf: &mut Vec<u8>) -> usize; | ||
| fn keep_read(&mut self, buf: &mut Vec<u8>, f: impl Fn(u8) -> bool) -> usize; | ||
| fn must_ignore(&mut self, f: impl Fn(u8) -> bool) -> Result<()> { | ||
| if !self.ignore(f) { | ||
| return Err(std::io::Error::new( | ||
| ErrorKind::InvalidData, | ||
| "Expected to ignore a byte", | ||
| )); | ||
| } | ||
| Ok(()) | ||
| } | ||
|
|
||
| fn must_ignore_byte(&mut self, b: u8) -> Result<()>; | ||
| } | ||
|
|
||
| impl<T> ReadBytesExt for Cursor<T> | ||
| where | ||
| T: AsRef<[u8]>, | ||
| { | ||
| fn peek(&mut self) -> Option<char> { | ||
| let buf = self.fill_buf().ok()?; | ||
| if buf.is_empty() { | ||
| None | ||
| } else { | ||
| Some(buf[0] as char) | ||
| } | ||
| } | ||
|
|
||
| fn peek_byte(&mut self) -> Option<u8> { | ||
| let buf = self.fill_buf().ok()?; | ||
| if buf.is_empty() { | ||
| None | ||
| } else { | ||
| Some(buf[0]) | ||
| } | ||
| } | ||
|
|
||
| fn ignore(&mut self, f: impl Fn(u8) -> bool) -> bool { | ||
| match self.fill_buf() { | ||
| Ok(available) => { | ||
| if available.is_empty() { | ||
| false | ||
| } else if f(available[0]) { | ||
| self.consume(1); | ||
| true | ||
| } else { | ||
| false | ||
| } | ||
| } | ||
| Err(_) => false, | ||
| } | ||
| } | ||
|
|
||
| fn ignores(&mut self, f: impl Fn(u8) -> bool) -> usize { | ||
| match self.fill_buf() { | ||
| Ok(available) => { | ||
| if available.is_empty() { | ||
| return 0; | ||
| } | ||
| for (index, byt) in available.iter().enumerate() { | ||
| if !f(*byt) { | ||
| self.consume(index); | ||
| return index; | ||
| } | ||
| } | ||
| let len = available.len(); | ||
| self.consume(len); | ||
| len | ||
| } | ||
| Err(_) => 0, | ||
| } | ||
| } | ||
|
|
||
| fn ignore_byte(&mut self, b: u8) -> bool { | ||
| self.ignore(|c| c == b) | ||
| } | ||
|
|
||
| fn ignore_bytes(&mut self, bs: &[u8]) -> bool { | ||
| match self.fill_buf() { | ||
| Ok(available) => { | ||
| let len = bs.len(); | ||
| if available.len() < len { | ||
| return false; | ||
| } | ||
| let eq = available[..len].iter().zip(bs).all(|(x, y)| x == y); | ||
| if eq { | ||
| self.consume(len); | ||
| } | ||
| eq | ||
| } | ||
| Err(_) => false, | ||
| } | ||
| } | ||
|
|
||
| fn must_ignore_byte(&mut self, b: u8) -> Result<()> { | ||
| if !self.ignore_byte(b) { | ||
| return Err(std::io::Error::new( | ||
| ErrorKind::InvalidData, | ||
| format!( | ||
| "Expected to have char '{}', got '{:?}' at pos {}", | ||
| b as char, | ||
| self.peek(), | ||
| self.position() | ||
| ), | ||
| )); | ||
| } | ||
| Ok(()) | ||
| } | ||
|
|
||
| fn ignore_white_spaces(&mut self) -> bool { | ||
| self.ignores(|c| c.is_ascii_whitespace()) > 0 | ||
| } | ||
|
|
||
| fn until(&mut self, delim: u8, buf: &mut Vec<u8>) -> usize { | ||
| match self.fill_buf() { | ||
| Ok(remaining_slice) => { | ||
| let to_read = memchr(delim, remaining_slice).map_or(buf.len(), |n| n + 1); | ||
| buf.extend_from_slice(&remaining_slice[..to_read]); | ||
| self.consume(to_read); | ||
| to_read | ||
| } | ||
| Err(_) => 0, | ||
| } | ||
| } | ||
|
|
||
| fn keep_read(&mut self, buf: &mut Vec<u8>, f: impl Fn(u8) -> bool) -> usize { | ||
| match self.fill_buf() { | ||
| Ok(remaining_slice) => { | ||
| let mut to_read = remaining_slice.len(); | ||
| for (i, b) in remaining_slice.iter().enumerate() { | ||
| if !f(*b) { | ||
| to_read = i; | ||
| break; | ||
| } | ||
| } | ||
| buf.extend_from_slice(&remaining_slice[..to_read]); | ||
| self.consume(to_read); | ||
| to_read | ||
| } | ||
| Err(_) => 0, | ||
| } | ||
| } | ||
| } |
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