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72 lines
1.8 KiB
72 lines
1.8 KiB
use std::{fmt, cmp};
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use std::fmt::{Formatter, Debug};
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/// Position in the input string
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#[derive(PartialEq, Clone, Default)]
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pub struct SourcePosition {
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/// The line number on which the error occurred.
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pub line: u32,
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/// The column number on which the error occurred.
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pub column: u32,
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/// The index in the given string which caused the error.
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pub index: u32,
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/// File index if there are multiple files
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pub file: u32,
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}
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impl fmt::Display for SourcePosition {
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fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
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write!(f, "{}:{}", self.line, self.column)
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}
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}
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impl SourcePosition {
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pub fn with_file(mut self, file: u32) -> Self {
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self.file = file;
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self
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}
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}
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impl Debug for SourcePosition {
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fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
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if f.alternate() {
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f.debug_struct("SourcePosition")
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.field("line", &self.line)
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.field("column", &self.column)
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.field("index", &self.index)
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.field("file", &self.file)
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.finish()
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} else {
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// shorter version
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write!(f, "Pos({}|{}:{})", self.file, self.line, self.column)
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}
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}
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}
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pub(crate) fn get_line_and_column(s: &str, pos: usize) -> SourcePosition {
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let mut line: usize = 1;
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let mut col: isize = -1;
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for c in s.chars().take(pos + 1) {
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if c == '\n' {
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line += 1;
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col = -1;
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} else {
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col += 1;
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}
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}
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SourcePosition {
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line: line as u32,
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column: cmp::max(col, 0) as u32,
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index: pos as u32,
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file: 0
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}
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}
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/// Build a span
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pub(crate) fn spos(s: &str, pos: usize) -> SourcePosition {
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if pos >= s.len() {
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Default::default()
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} else {
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get_line_and_column(s, pos)
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}
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}
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