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//! Contains common types and functions used throughout the library.
use std::fmt;
/// Represents a position inside some textual document.
#[derive(Copy, Clone, PartialEq, Eq)]
pub struct TextPosition {
/// Row, counting from 0
pub row: u64,
/// Column, counting from 0
pub column: u64,
}
impl TextPosition {
/// Creates a new position initialized to the beginning of the document
#[inline]
pub fn new() -> TextPosition {
TextPosition { row: 0, column: 0 }
}
/// Advances the position in a line
#[inline]
pub fn advance(&mut self, count: u8) {
self.column += count as u64;
}
/// Advances the position in a line to the next tab position
#[inline]
pub fn advance_to_tab(&mut self, width: u8) {
let width = width as u64;
self.column += width - self.column % width
}
/// Advances the position to the beginning of the next line
#[inline]
pub fn new_line(&mut self) {
self.column = 0;
self.row += 1;
}
}
impl fmt::Debug for TextPosition {
#[inline]
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{}:{}", self.row + 1, self.column + 1)
}
}
impl fmt::Display for TextPosition {
#[inline]
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{}:{}", self.row + 1, self.column + 1)
}
}
/// Get the position in the document corresponding to the object
///
/// This trait is implemented by parsers, lexers and errors.
pub trait Position {
/// Returns the current position or a position corresponding to the object.
fn position(&self) -> TextPosition;
}
impl Position for TextPosition {
#[inline]
fn position(&self) -> TextPosition {
*self
}
}
/// XML version enumeration.
#[derive(Copy, Clone, PartialEq, Eq)]
pub enum XmlVersion {
/// XML version 1.0.
Version10,
/// XML version 1.1.
Version11
}
impl fmt::Display for XmlVersion {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self {
XmlVersion::Version10 => write!(f, "1.0"),
XmlVersion::Version11 => write!(f, "1.1")
}
}
}
impl fmt::Debug for XmlVersion {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
fmt::Display::fmt(self, f)
}
}
/// Checks whether the given character is a white space character (`S`)
/// as is defined by XML 1.1 specification, [section 2.3][1].
///
pub fn is_whitespace_char(c: char) -> bool {
match c {
'\x20' | '\x09' | '\x0d' | '\x0a' => true,
_ => false
}
}
/// Checks whether the given string is compound only by white space
/// characters (`S`) using the previous is_whitespace_char to check
/// all characters of this string
pub fn is_whitespace_str(s: &str) -> bool {
s.chars().all(is_whitespace_char)
}
/// Checks whether the given character is a name start character (`NameStartChar`)
/// as is defined by XML 1.1 specification, [section 2.3][1].
///
pub fn is_name_start_char(c: char) -> bool {
match c {
':' | 'A'...'Z' | '_' | 'a'...'z' |
'\u{C0}'...'\u{D6}' | '\u{D8}'...'\u{F6}' | '\u{F8}'...'\u{2FF}' |
'\u{370}'...'\u{37D}' | '\u{37F}'...'\u{1FFF}' |
'\u{200C}'...'\u{200D}' | '\u{2070}'...'\u{218F}' |
'\u{2C00}'...'\u{2FEF}' | '\u{3001}'...'\u{D7FF}' |
'\u{F900}'...'\u{FDCF}' | '\u{FDF0}'...'\u{FFFD}' |
'\u{10000}'...'\u{EFFFF}' => true,
_ => false
}
}
/// Checks whether the given character is a name character (`NameChar`)
/// as is defined by XML 1.1 specification, [section 2.3][1].
///
pub fn is_name_char(c: char) -> bool {
match c {
_ if is_name_start_char(c) => true,
'-' | '.' | '0'...'9' | '\u{B7}' |
'\u{300}'...'\u{36F}' | '\u{203F}'...'\u{2040}' => true,
_ => false
}
}