RustyPython-parser/core/src/source_code.rs at main · mxgordon/RustyPython-parser · GitHub

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// re-export our public interface

use crate::text_size::{TextLen, TextSize};

use memchr::memrchr2;

pub use crate::source_location::{

newlines::{find_newline, UniversalNewlineIterator},

LineIndex, OneIndexed, SourceCode, SourceLocation,

};

pub type LineNumber = OneIndexed;

#[derive(Debug, Copy, Clone, Default)]

pub struct SourceRange {

pub start: SourceLocation,

pub end: Option<SourceLocation>,

}

impl SourceRange {

pub fn new(start: SourceLocation, end: SourceLocation) -> Self {

Self {

start,

end: Some(end),

}

pub fn unwrap_end(&self) -> SourceLocation {

self.end.unwrap()

}

impl From<std::ops::Range<SourceLocation>> for SourceRange {

fn from(value: std::ops::Range<SourceLocation>) -> Self {

Self {

start: value.start,

end: Some(value.end),

}

/// Converts source code byte-offset to Python convention line and column numbers.

pub struct RandomLocator<'a> {

pub source: &'a str,

index: LineIndex,

}

impl<'a> RandomLocator<'a> {

#[inline]

pub fn new(source: &'a str) -> Self {

let index = LineIndex::from_source_text(source);

Self { source, index }

}

pub fn to_source_code(&self) -> SourceCode {

SourceCode::new(self.source, &self.index)

}

pub fn locate(&mut self, offset: crate::text_size::TextSize) -> SourceLocation {

let offset = offset.to_u32().into();

self.to_source_code().source_location(offset)

}

pub fn locate_error<T, U>(&mut self, base: crate::error::BaseError<T>) -> LocatedError

where

T: Into,

{

let location = self.locate(base.offset);

LocatedError {

error: base.error.into(),

location: Some(location),

source_path: base.source_path,

}

/// Converts source code byte-offset to Python convention line and column numbers.

pub struct LinearLocator<'a> {

pub source: &'a str,

state: LinearLocatorState,

#[cfg(debug_assertions)]

index: LineIndex,

}

struct LinearLocatorState {

line_start: TextSize,

line_end: Option<TextSize>,

line_number: OneIndexed,

cursor: TextSize,

is_ascii: bool,

}

impl LinearLocatorState {

fn init(source: &str) -> Self {

let mut line_start = TextSize::default();

if source.starts_with('\u{feff}') {

line_start += '\u{feff}'.text_len();

}

let (line_end, is_ascii) = if let Some((position, line_ending)) = find_newline(source) {

let is_ascii = source[..position].is_ascii();

(

Some(TextSize::new(position as u32 + line_ending.len() as u32)),

is_ascii,

)

} else {

(None, source.is_ascii())

};

let line_number = OneIndexed::MIN;

Self {

line_start,

line_end,

line_number,

cursor: line_start,

is_ascii,

}

fn new_line_start(&self, next_offset: TextSize) -> Option<TextSize> {

if let Some(new_line_start) = self.line_end {

if new_line_start <= next_offset {

return Some(new_line_start);

}

None

}

impl<'a> LinearLocator<'a> {

// nl = newline

#[inline]

pub fn new(source: &'a str) -> Self {

let state = LinearLocatorState::init(source);

Self {

source,

state,

#[cfg(debug_assertions)]

index: LineIndex::from_source_text(source),

}

pub fn locate(&mut self, offset: crate::text_size::TextSize) -> SourceLocation {

debug_assert!(

self.state.cursor <= offset,

"{:?} -> {:?} {}",

self.state.cursor,

offset,

&self.source[offset.to_usize()..self.state.cursor.to_usize()]

);

let (column, new_state) = self.locate_inner(offset);

if let Some(state) = new_state {

self.state = state;

} else {

self.state.cursor = offset;

}

SourceLocation {

row: self.state.line_number,

column,

}

pub fn locate_only(&mut self, offset: crate::text_size::TextSize) -> SourceLocation {

let (column, new_state) = self.locate_inner(offset);

let state = new_state.as_ref().unwrap_or(&self.state);

SourceLocation {

row: state.line_number,

column,

}

fn locate_inner(

&mut self,

offset: crate::text_size::TextSize,

) -> (OneIndexed, Option<LinearLocatorState>) {

let (column, new_state) = if let Some(new_line_start) = self.state.new_line_start(offset) {

// not fit in current line

let focused = &self.source[new_line_start.to_usize()..offset.to_usize()];

let (lines, line_start, column) =

if let Some(last_newline) = memrchr2(b'\r', b'\n', focused.as_bytes()) {

let last_newline = new_line_start.to_usize() + last_newline;

let lines = UniversalNewlineIterator::from(

&self.source[self.state.cursor.to_usize()..last_newline + 1],

)

.count();

let line_start = last_newline as u32 + 1;

let column = offset.to_u32() - line_start;

(lines as u32, line_start, column)

} else {

let column = (offset - new_line_start).to_u32();

(1, new_line_start.to_u32(), column)

};

let line_number = self.state.line_number.saturating_add(lines);

let (line_end, is_ascii) = if let Some((newline, line_ending)) =

find_newline(&self.source[line_start as usize..])

{

let newline = line_start as usize + newline;

let is_ascii = self.source[line_start as usize..newline].is_ascii();

(

Some(TextSize::new(newline as u32 + line_ending.len() as u32)),

is_ascii,

)

} else {

let is_ascii = self.source[line_start as usize..].is_ascii();

(None, is_ascii)

};

let line_start = TextSize::new(line_start);

let state = LinearLocatorState {

line_start,

line_end,

line_number,

cursor: offset,

is_ascii,

};

(column, Some(state))

} else {

let column = (offset - self.state.line_start).to_u32();

(column, None)

};

let state = new_state.as_ref().unwrap_or(&self.state);

let column = if state.is_ascii {

column

} else {

self.source[state.line_start.to_usize()..][..column as usize]

.chars()

.count() as u32

};

let column = OneIndexed::from_zero_indexed(column);

#[cfg(debug_assertions)]

{

let location = SourceLocation {

row: state.line_number,

column,

};

let source_code = SourceCode::new(self.source, &self.index);

assert_eq!(

location,

source_code.source_location(offset),

"input: {} -> {} {}",

self.state.cursor.to_usize(),

offset.to_usize(),

&self.source[self.state.cursor.to_usize()..offset.to_usize()]

);

}

(column, new_state)

}

pub fn locate_error<T, U>(&mut self, base: crate::error::BaseError<T>) -> LocatedError

where

T: Into,

{

let location = self.locate(base.offset);

LocatedError {

error: base.error.into(),

location: Some(location),

source_path: base.source_path,

}

#[derive(Debug, PartialEq, Eq)]

pub struct LocatedError<T> {

pub error: T,

pub location: Option<SourceLocation>,

pub source_path: String,

}

impl<T> LocatedError<T> {

pub fn error(self) -> T {

self.error

}

pub fn from(obj: LocatedError) -> Self

where

U: Into<T>,

{

Self {

error: obj.error.into(),

location: obj.location,

source_path: obj.source_path,

}

pub fn into(self) -> LocatedError

where

T: Into,

{

LocatedError::from(self)

}

pub fn python_location(&self) -> (usize, usize) {

if let Some(location) = self.location {

(location.row.to_usize(), location.column.to_usize())

} else {

(0, 0)

}

impl<T> std::fmt::Display for LocatedError<T>

where

T: std::fmt::Display,

{

fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {

let (row, column) = self

.location

.map_or((0, 0), |l| (l.row.to_usize(), l.column.to_usize()));

write!(f, "{} at row {} col {}", &self.error, row, column,)

}

impl<T> std::error::Error for LocatedError<T>

where

T: std::error::Error + 'static,

{

fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {

Some(&self.error)

}

#[test]

fn test_linear_locator() {

let source = r#"

123456789

abcdefghi

유니코드

.strip_prefix(char::is_whitespace)

.unwrap();

let mut locator = LinearLocator::new(source);

let mut random_locator = RandomLocator::new(source);

let mut test = |(row, col), offset| {

let input = TextSize::from(offset);

let expected: SourceLocation = SourceLocation {

row: OneIndexed::new(row).unwrap(),

column: OneIndexed::new(col).unwrap(),

};

let actual = locator.locate(input);

let actual2 = random_locator.locate(input);

assert_eq!(expected, actual);

assert_eq!(expected, actual2);

};

test((1, 1), 0);

test((1, 6), 5);

test((1, 9), 8);

test((2, 1), 10);

test((4, 1), 21);

test((4, 3), 27);

}

RustyPython-parser/core/src/source_code.rs at main · mxgordon/RustyPython-parser · GitHub

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