867 lines
28 KiB
Rust
867 lines
28 KiB
Rust
//! Macro support for format strings
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//!
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//! These structures are used when parsing format strings for the compiler.
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//! Parsing does not happen at runtime: structures of `std::fmt::rt` are
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//! generated instead.
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#![doc(html_root_url = "https://doc.rust-lang.org/nightly/",
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html_playground_url = "https://play.rust-lang.org/",
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test(attr(deny(warnings))))]
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#![deny(rust_2018_idioms)]
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#![feature(nll)]
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#![feature(rustc_private)]
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pub use Piece::*;
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pub use Position::*;
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pub use Alignment::*;
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pub use Flag::*;
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pub use Count::*;
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use std::str;
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use std::string;
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use std::iter;
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/// A piece is a portion of the format string which represents the next part
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/// to emit. These are emitted as a stream by the `Parser` class.
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#[derive(Copy, Clone, PartialEq)]
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pub enum Piece<'a> {
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/// A literal string which should directly be emitted
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String(&'a str),
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/// This describes that formatting should process the next argument (as
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/// specified inside) for emission.
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NextArgument(Argument<'a>),
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}
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/// Representation of an argument specification.
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#[derive(Copy, Clone, PartialEq)]
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pub struct Argument<'a> {
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/// Where to find this argument
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pub position: Position<'a>,
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/// How to format the argument
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pub format: FormatSpec<'a>,
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}
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/// Specification for the formatting of an argument in the format string.
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#[derive(Copy, Clone, PartialEq)]
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pub struct FormatSpec<'a> {
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/// Optionally specified character to fill alignment with
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pub fill: Option<char>,
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/// Optionally specified alignment
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pub align: Alignment,
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/// Packed version of various flags provided
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pub flags: u32,
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/// The integer precision to use
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pub precision: Count<'a>,
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/// The string width requested for the resulting format
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pub width: Count<'a>,
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/// The descriptor string representing the name of the format desired for
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/// this argument, this can be empty or any number of characters, although
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/// it is required to be one word.
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pub ty: &'a str,
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}
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/// Enum describing where an argument for a format can be located.
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#[derive(Copy, Clone, PartialEq)]
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pub enum Position<'a> {
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/// The argument is implied to be located at an index
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ArgumentImplicitlyIs(usize),
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/// The argument is located at a specific index given in the format
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ArgumentIs(usize),
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/// The argument has a name.
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ArgumentNamed(&'a str),
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}
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impl Position<'_> {
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pub fn index(&self) -> Option<usize> {
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match self {
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ArgumentIs(i) | ArgumentImplicitlyIs(i) => Some(*i),
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_ => None,
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}
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}
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}
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/// Enum of alignments which are supported.
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#[derive(Copy, Clone, PartialEq)]
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pub enum Alignment {
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/// The value will be aligned to the left.
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AlignLeft,
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/// The value will be aligned to the right.
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AlignRight,
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/// The value will be aligned in the center.
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AlignCenter,
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/// The value will take on a default alignment.
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AlignUnknown,
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}
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/// Various flags which can be applied to format strings. The meaning of these
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/// flags is defined by the formatters themselves.
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#[derive(Copy, Clone, PartialEq)]
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pub enum Flag {
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/// A `+` will be used to denote positive numbers.
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FlagSignPlus,
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/// A `-` will be used to denote negative numbers. This is the default.
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FlagSignMinus,
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/// An alternate form will be used for the value. In the case of numbers,
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/// this means that the number will be prefixed with the supplied string.
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FlagAlternate,
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/// For numbers, this means that the number will be padded with zeroes,
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/// and the sign (`+` or `-`) will precede them.
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FlagSignAwareZeroPad,
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/// For Debug / `?`, format integers in lower-case hexadecimal.
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FlagDebugLowerHex,
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/// For Debug / `?`, format integers in upper-case hexadecimal.
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FlagDebugUpperHex,
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}
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/// A count is used for the precision and width parameters of an integer, and
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/// can reference either an argument or a literal integer.
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#[derive(Copy, Clone, PartialEq)]
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pub enum Count<'a> {
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/// The count is specified explicitly.
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CountIs(usize),
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/// The count is specified by the argument with the given name.
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CountIsName(&'a str),
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/// The count is specified by the argument at the given index.
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CountIsParam(usize),
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/// The count is implied and cannot be explicitly specified.
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CountImplied,
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}
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pub struct ParseError {
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pub description: string::String,
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pub note: Option<string::String>,
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pub label: string::String,
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pub start: SpanIndex,
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pub end: SpanIndex,
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pub secondary_label: Option<(string::String, SpanIndex, SpanIndex)>,
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}
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/// The parser structure for interpreting the input format string. This is
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/// modeled as an iterator over `Piece` structures to form a stream of tokens
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/// being output.
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///
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/// This is a recursive-descent parser for the sake of simplicity, and if
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/// necessary there's probably lots of room for improvement performance-wise.
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pub struct Parser<'a> {
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input: &'a str,
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cur: iter::Peekable<str::CharIndices<'a>>,
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/// Error messages accumulated during parsing
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pub errors: Vec<ParseError>,
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/// Current position of implicit positional argument pointer
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curarg: usize,
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/// `Some(raw count)` when the string is "raw", used to position spans correctly
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style: Option<usize>,
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/// Start and end byte offset of every successfully parsed argument
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pub arg_places: Vec<(SpanIndex, SpanIndex)>,
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/// Characters that need to be shifted
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skips: Vec<usize>,
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/// Span offset of the last opening brace seen, used for error reporting
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last_opening_brace_pos: Option<SpanIndex>,
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/// Wether the source string is comes from `println!` as opposed to `format!` or `print!`
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append_newline: bool,
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}
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#[derive(Clone, Copy, Debug)]
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pub struct SpanIndex(pub usize);
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impl SpanIndex {
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pub fn unwrap(self) -> usize {
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self.0
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}
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}
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impl<'a> Iterator for Parser<'a> {
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type Item = Piece<'a>;
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fn next(&mut self) -> Option<Piece<'a>> {
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if let Some(&(pos, c)) = self.cur.peek() {
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match c {
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'{' => {
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let curr_last_brace = self.last_opening_brace_pos;
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self.last_opening_brace_pos = Some(self.to_span_index(pos));
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self.cur.next();
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if self.consume('{') {
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self.last_opening_brace_pos = curr_last_brace;
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Some(String(self.string(pos + 1)))
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} else {
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let arg = self.argument();
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if let Some(arg_pos) = self.must_consume('}').map(|end| {
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(self.to_span_index(pos), self.to_span_index(end + 1))
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}) {
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self.arg_places.push(arg_pos);
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}
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Some(NextArgument(arg))
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}
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}
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'}' => {
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self.cur.next();
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if self.consume('}') {
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Some(String(self.string(pos + 1)))
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} else {
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let err_pos = self.to_span_index(pos);
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self.err_with_note(
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"unmatched `}` found",
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"unmatched `}`",
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"if you intended to print `}`, you can escape it using `}}`",
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err_pos,
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err_pos,
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);
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None
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}
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}
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'\n' => {
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Some(String(self.string(pos)))
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}
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_ => Some(String(self.string(pos))),
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}
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} else {
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None
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}
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}
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}
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impl<'a> Parser<'a> {
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/// Creates a new parser for the given format string
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pub fn new(
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s: &'a str,
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style: Option<usize>,
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skips: Vec<usize>,
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append_newline: bool,
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) -> Parser<'a> {
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Parser {
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input: s,
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cur: s.char_indices().peekable(),
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errors: vec![],
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curarg: 0,
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style,
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arg_places: vec![],
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skips,
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last_opening_brace_pos: None,
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append_newline,
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}
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}
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/// Notifies of an error. The message doesn't actually need to be of type
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/// String, but I think it does when this eventually uses conditions so it
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/// might as well start using it now.
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fn err<S1: Into<string::String>, S2: Into<string::String>>(
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&mut self,
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description: S1,
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label: S2,
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start: SpanIndex,
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end: SpanIndex,
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) {
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self.errors.push(ParseError {
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description: description.into(),
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note: None,
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label: label.into(),
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start,
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end,
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secondary_label: None,
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});
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}
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/// Notifies of an error. The message doesn't actually need to be of type
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/// String, but I think it does when this eventually uses conditions so it
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/// might as well start using it now.
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fn err_with_note<S1: Into<string::String>, S2: Into<string::String>, S3: Into<string::String>>(
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&mut self,
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description: S1,
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label: S2,
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note: S3,
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start: SpanIndex,
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end: SpanIndex,
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) {
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self.errors.push(ParseError {
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description: description.into(),
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note: Some(note.into()),
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label: label.into(),
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start,
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end,
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secondary_label: None,
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});
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}
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/// Optionally consumes the specified character. If the character is not at
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/// the current position, then the current iterator isn't moved and false is
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/// returned, otherwise the character is consumed and true is returned.
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fn consume(&mut self, c: char) -> bool {
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if let Some(&(_, maybe)) = self.cur.peek() {
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if c == maybe {
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self.cur.next();
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true
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} else {
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false
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}
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} else {
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false
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}
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}
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fn raw(&self) -> usize {
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self.style.map(|raw| raw + 1).unwrap_or(0)
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}
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fn to_span_index(&self, pos: usize) -> SpanIndex {
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let mut pos = pos;
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for skip in &self.skips {
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if pos > *skip {
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pos += 1;
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} else if pos == *skip && self.raw() == 0 {
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pos += 1;
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} else {
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break;
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}
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}
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SpanIndex(self.raw() + pos + 1)
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}
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/// Forces consumption of the specified character. If the character is not
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/// found, an error is emitted.
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fn must_consume(&mut self, c: char) -> Option<usize> {
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self.ws();
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if let Some(&(pos, maybe)) = self.cur.peek() {
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if c == maybe {
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self.cur.next();
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Some(pos)
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} else {
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let pos = self.to_span_index(pos);
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let description = format!("expected `'}}'`, found `{:?}`", maybe);
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let label = "expected `}`".to_owned();
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let (note, secondary_label) = if c == '}' {
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(Some("if you intended to print `{`, you can escape it using `{{`".to_owned()),
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self.last_opening_brace_pos.map(|pos| {
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("because of this opening brace".to_owned(), pos, pos)
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}))
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} else {
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(None, None)
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};
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self.errors.push(ParseError {
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description,
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note,
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label,
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start: pos,
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end: pos,
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secondary_label,
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});
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None
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}
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} else {
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let description = format!("expected `{:?}` but string was terminated", c);
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// point at closing `"`
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let pos = self.input.len() - if self.append_newline { 1 } else { 0 };
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let pos = self.to_span_index(pos);
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if c == '}' {
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let label = format!("expected `{:?}`", c);
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let (note, secondary_label) = if c == '}' {
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(Some("if you intended to print `{`, you can escape it using `{{`".to_owned()),
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self.last_opening_brace_pos.map(|pos| {
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("because of this opening brace".to_owned(), pos, pos)
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}))
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} else {
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(None, None)
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};
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self.errors.push(ParseError {
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description,
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note,
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label,
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start: pos,
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end: pos,
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secondary_label,
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});
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} else {
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self.err(description, format!("expected `{:?}`", c), pos, pos);
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}
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None
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}
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}
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/// Consumes all whitespace characters until the first non-whitespace character
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fn ws(&mut self) {
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while let Some(&(_, c)) = self.cur.peek() {
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if c.is_whitespace() {
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self.cur.next();
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} else {
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break;
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}
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}
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}
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/// Parses all of a string which is to be considered a "raw literal" in a
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/// format string. This is everything outside of the braces.
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fn string(&mut self, start: usize) -> &'a str {
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// we may not consume the character, peek the iterator
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while let Some(&(pos, c)) = self.cur.peek() {
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match c {
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'{' | '}' => {
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return &self.input[start..pos];
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}
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_ => {
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self.cur.next();
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}
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}
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}
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&self.input[start..self.input.len()]
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}
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/// Parses an Argument structure, or what's contained within braces inside the format string
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fn argument(&mut self) -> Argument<'a> {
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let pos = self.position();
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let format = self.format();
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// Resolve position after parsing format spec.
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let pos = match pos {
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Some(position) => position,
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None => {
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let i = self.curarg;
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self.curarg += 1;
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ArgumentImplicitlyIs(i)
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}
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};
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Argument {
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position: pos,
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format,
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}
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}
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/// Parses a positional argument for a format. This could either be an
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/// integer index of an argument, a named argument, or a blank string.
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/// Returns `Some(parsed_position)` if the position is not implicitly
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/// consuming a macro argument, `None` if it's the case.
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fn position(&mut self) -> Option<Position<'a>> {
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if let Some(i) = self.integer() {
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Some(ArgumentIs(i))
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} else {
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match self.cur.peek() {
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Some(&(_, c)) if c.is_alphabetic() => Some(ArgumentNamed(self.word())),
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Some(&(pos, c)) if c == '_' => {
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let invalid_name = self.string(pos);
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self.err_with_note(format!("invalid argument name `{}`", invalid_name),
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"invalid argument name",
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"argument names cannot start with an underscore",
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self.to_span_index(pos),
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self.to_span_index(pos + invalid_name.len()));
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Some(ArgumentNamed(invalid_name))
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},
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|
|
|
// This is an `ArgumentNext`.
|
|
// Record the fact and do the resolution after parsing the
|
|
// format spec, to make things like `{:.*}` work.
|
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_ => None,
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}
|
|
}
|
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}
|
|
|
|
/// Parses a format specifier at the current position, returning all of the
|
|
/// relevant information in the FormatSpec struct.
|
|
fn format(&mut self) -> FormatSpec<'a> {
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let mut spec = FormatSpec {
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fill: None,
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|
align: AlignUnknown,
|
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flags: 0,
|
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precision: CountImplied,
|
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width: CountImplied,
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ty: &self.input[..0],
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};
|
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if !self.consume(':') {
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return spec;
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|
}
|
|
|
|
// fill character
|
|
if let Some(&(_, c)) = self.cur.peek() {
|
|
match self.cur.clone().nth(1) {
|
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Some((_, '>')) | Some((_, '<')) | Some((_, '^')) => {
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spec.fill = Some(c);
|
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self.cur.next();
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|
}
|
|
_ => {}
|
|
}
|
|
}
|
|
// Alignment
|
|
if self.consume('<') {
|
|
spec.align = AlignLeft;
|
|
} else if self.consume('>') {
|
|
spec.align = AlignRight;
|
|
} else if self.consume('^') {
|
|
spec.align = AlignCenter;
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|
}
|
|
// Sign flags
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|
if self.consume('+') {
|
|
spec.flags |= 1 << (FlagSignPlus as u32);
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|
} else if self.consume('-') {
|
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spec.flags |= 1 << (FlagSignMinus as u32);
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}
|
|
// Alternate marker
|
|
if self.consume('#') {
|
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spec.flags |= 1 << (FlagAlternate as u32);
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}
|
|
// Width and precision
|
|
let mut havewidth = false;
|
|
if self.consume('0') {
|
|
// small ambiguity with '0$' as a format string. In theory this is a
|
|
// '0' flag and then an ill-formatted format string with just a '$'
|
|
// and no count, but this is better if we instead interpret this as
|
|
// no '0' flag and '0$' as the width instead.
|
|
if self.consume('$') {
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spec.width = CountIsParam(0);
|
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havewidth = true;
|
|
} else {
|
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spec.flags |= 1 << (FlagSignAwareZeroPad as u32);
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}
|
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}
|
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if !havewidth {
|
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spec.width = self.count();
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}
|
|
if self.consume('.') {
|
|
if self.consume('*') {
|
|
// Resolve `CountIsNextParam`.
|
|
// We can do this immediately as `position` is resolved later.
|
|
let i = self.curarg;
|
|
self.curarg += 1;
|
|
spec.precision = CountIsParam(i);
|
|
} else {
|
|
spec.precision = self.count();
|
|
}
|
|
}
|
|
// Optional radix followed by the actual format specifier
|
|
if self.consume('x') {
|
|
if self.consume('?') {
|
|
spec.flags |= 1 << (FlagDebugLowerHex as u32);
|
|
spec.ty = "?";
|
|
} else {
|
|
spec.ty = "x";
|
|
}
|
|
} else if self.consume('X') {
|
|
if self.consume('?') {
|
|
spec.flags |= 1 << (FlagDebugUpperHex as u32);
|
|
spec.ty = "?";
|
|
} else {
|
|
spec.ty = "X";
|
|
}
|
|
} else if self.consume('?') {
|
|
spec.ty = "?";
|
|
} else {
|
|
spec.ty = self.word();
|
|
}
|
|
spec
|
|
}
|
|
|
|
/// Parses a Count parameter at the current position. This does not check
|
|
/// for 'CountIsNextParam' because that is only used in precision, not
|
|
/// width.
|
|
fn count(&mut self) -> Count<'a> {
|
|
if let Some(i) = self.integer() {
|
|
if self.consume('$') {
|
|
CountIsParam(i)
|
|
} else {
|
|
CountIs(i)
|
|
}
|
|
} else {
|
|
let tmp = self.cur.clone();
|
|
let word = self.word();
|
|
if word.is_empty() {
|
|
self.cur = tmp;
|
|
CountImplied
|
|
} else if self.consume('$') {
|
|
CountIsName(word)
|
|
} else {
|
|
self.cur = tmp;
|
|
CountImplied
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Parses a word starting at the current position. A word is considered to
|
|
/// be an alphabetic character followed by any number of alphanumeric
|
|
/// characters.
|
|
fn word(&mut self) -> &'a str {
|
|
let start = match self.cur.peek() {
|
|
Some(&(pos, c)) if c.is_xid_start() => {
|
|
self.cur.next();
|
|
pos
|
|
}
|
|
_ => {
|
|
return &self.input[..0];
|
|
}
|
|
};
|
|
while let Some(&(pos, c)) = self.cur.peek() {
|
|
if c.is_xid_continue() {
|
|
self.cur.next();
|
|
} else {
|
|
return &self.input[start..pos];
|
|
}
|
|
}
|
|
&self.input[start..self.input.len()]
|
|
}
|
|
|
|
/// Optionally parses an integer at the current position. This doesn't deal
|
|
/// with overflow at all, it's just accumulating digits.
|
|
fn integer(&mut self) -> Option<usize> {
|
|
let mut cur = 0;
|
|
let mut found = false;
|
|
while let Some(&(_, c)) = self.cur.peek() {
|
|
if let Some(i) = c.to_digit(10) {
|
|
cur = cur * 10 + i as usize;
|
|
found = true;
|
|
self.cur.next();
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
if found {
|
|
Some(cur)
|
|
} else {
|
|
None
|
|
}
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::*;
|
|
|
|
fn same(fmt: &'static str, p: &[Piece<'static>]) {
|
|
let parser = Parser::new(fmt, None, vec![], false);
|
|
assert!(parser.collect::<Vec<Piece<'static>>>() == p);
|
|
}
|
|
|
|
fn fmtdflt() -> FormatSpec<'static> {
|
|
return FormatSpec {
|
|
fill: None,
|
|
align: AlignUnknown,
|
|
flags: 0,
|
|
precision: CountImplied,
|
|
width: CountImplied,
|
|
ty: "",
|
|
};
|
|
}
|
|
|
|
fn musterr(s: &str) {
|
|
let mut p = Parser::new(s, None, vec![], false);
|
|
p.next();
|
|
assert!(!p.errors.is_empty());
|
|
}
|
|
|
|
#[test]
|
|
fn simple() {
|
|
same("asdf", &[String("asdf")]);
|
|
same("a{{b", &[String("a"), String("{b")]);
|
|
same("a}}b", &[String("a"), String("}b")]);
|
|
same("a}}", &[String("a"), String("}")]);
|
|
same("}}", &[String("}")]);
|
|
same("\\}}", &[String("\\"), String("}")]);
|
|
}
|
|
|
|
#[test]
|
|
fn invalid01() {
|
|
musterr("{")
|
|
}
|
|
#[test]
|
|
fn invalid02() {
|
|
musterr("}")
|
|
}
|
|
#[test]
|
|
fn invalid04() {
|
|
musterr("{3a}")
|
|
}
|
|
#[test]
|
|
fn invalid05() {
|
|
musterr("{:|}")
|
|
}
|
|
#[test]
|
|
fn invalid06() {
|
|
musterr("{:>>>}")
|
|
}
|
|
|
|
#[test]
|
|
fn format_nothing() {
|
|
same("{}",
|
|
&[NextArgument(Argument {
|
|
position: ArgumentImplicitlyIs(0),
|
|
format: fmtdflt(),
|
|
})]);
|
|
}
|
|
#[test]
|
|
fn format_position() {
|
|
same("{3}",
|
|
&[NextArgument(Argument {
|
|
position: ArgumentIs(3),
|
|
format: fmtdflt(),
|
|
})]);
|
|
}
|
|
#[test]
|
|
fn format_position_nothing_else() {
|
|
same("{3:}",
|
|
&[NextArgument(Argument {
|
|
position: ArgumentIs(3),
|
|
format: fmtdflt(),
|
|
})]);
|
|
}
|
|
#[test]
|
|
fn format_type() {
|
|
same("{3:a}",
|
|
&[NextArgument(Argument {
|
|
position: ArgumentIs(3),
|
|
format: FormatSpec {
|
|
fill: None,
|
|
align: AlignUnknown,
|
|
flags: 0,
|
|
precision: CountImplied,
|
|
width: CountImplied,
|
|
ty: "a",
|
|
},
|
|
})]);
|
|
}
|
|
#[test]
|
|
fn format_align_fill() {
|
|
same("{3:>}",
|
|
&[NextArgument(Argument {
|
|
position: ArgumentIs(3),
|
|
format: FormatSpec {
|
|
fill: None,
|
|
align: AlignRight,
|
|
flags: 0,
|
|
precision: CountImplied,
|
|
width: CountImplied,
|
|
ty: "",
|
|
},
|
|
})]);
|
|
same("{3:0<}",
|
|
&[NextArgument(Argument {
|
|
position: ArgumentIs(3),
|
|
format: FormatSpec {
|
|
fill: Some('0'),
|
|
align: AlignLeft,
|
|
flags: 0,
|
|
precision: CountImplied,
|
|
width: CountImplied,
|
|
ty: "",
|
|
},
|
|
})]);
|
|
same("{3:*<abcd}",
|
|
&[NextArgument(Argument {
|
|
position: ArgumentIs(3),
|
|
format: FormatSpec {
|
|
fill: Some('*'),
|
|
align: AlignLeft,
|
|
flags: 0,
|
|
precision: CountImplied,
|
|
width: CountImplied,
|
|
ty: "abcd",
|
|
},
|
|
})]);
|
|
}
|
|
#[test]
|
|
fn format_counts() {
|
|
same("{:10s}",
|
|
&[NextArgument(Argument {
|
|
position: ArgumentImplicitlyIs(0),
|
|
format: FormatSpec {
|
|
fill: None,
|
|
align: AlignUnknown,
|
|
flags: 0,
|
|
precision: CountImplied,
|
|
width: CountIs(10),
|
|
ty: "s",
|
|
},
|
|
})]);
|
|
same("{:10$.10s}",
|
|
&[NextArgument(Argument {
|
|
position: ArgumentImplicitlyIs(0),
|
|
format: FormatSpec {
|
|
fill: None,
|
|
align: AlignUnknown,
|
|
flags: 0,
|
|
precision: CountIs(10),
|
|
width: CountIsParam(10),
|
|
ty: "s",
|
|
},
|
|
})]);
|
|
same("{:.*s}",
|
|
&[NextArgument(Argument {
|
|
position: ArgumentImplicitlyIs(1),
|
|
format: FormatSpec {
|
|
fill: None,
|
|
align: AlignUnknown,
|
|
flags: 0,
|
|
precision: CountIsParam(0),
|
|
width: CountImplied,
|
|
ty: "s",
|
|
},
|
|
})]);
|
|
same("{:.10$s}",
|
|
&[NextArgument(Argument {
|
|
position: ArgumentImplicitlyIs(0),
|
|
format: FormatSpec {
|
|
fill: None,
|
|
align: AlignUnknown,
|
|
flags: 0,
|
|
precision: CountIsParam(10),
|
|
width: CountImplied,
|
|
ty: "s",
|
|
},
|
|
})]);
|
|
same("{:a$.b$s}",
|
|
&[NextArgument(Argument {
|
|
position: ArgumentImplicitlyIs(0),
|
|
format: FormatSpec {
|
|
fill: None,
|
|
align: AlignUnknown,
|
|
flags: 0,
|
|
precision: CountIsName("b"),
|
|
width: CountIsName("a"),
|
|
ty: "s",
|
|
},
|
|
})]);
|
|
}
|
|
#[test]
|
|
fn format_flags() {
|
|
same("{:-}",
|
|
&[NextArgument(Argument {
|
|
position: ArgumentImplicitlyIs(0),
|
|
format: FormatSpec {
|
|
fill: None,
|
|
align: AlignUnknown,
|
|
flags: (1 << FlagSignMinus as u32),
|
|
precision: CountImplied,
|
|
width: CountImplied,
|
|
ty: "",
|
|
},
|
|
})]);
|
|
same("{:+#}",
|
|
&[NextArgument(Argument {
|
|
position: ArgumentImplicitlyIs(0),
|
|
format: FormatSpec {
|
|
fill: None,
|
|
align: AlignUnknown,
|
|
flags: (1 << FlagSignPlus as u32) | (1 << FlagAlternate as u32),
|
|
precision: CountImplied,
|
|
width: CountImplied,
|
|
ty: "",
|
|
},
|
|
})]);
|
|
}
|
|
#[test]
|
|
fn format_mixture() {
|
|
same("abcd {3:a} efg",
|
|
&[String("abcd "),
|
|
NextArgument(Argument {
|
|
position: ArgumentIs(3),
|
|
format: FormatSpec {
|
|
fill: None,
|
|
align: AlignUnknown,
|
|
flags: 0,
|
|
precision: CountImplied,
|
|
width: CountImplied,
|
|
ty: "a",
|
|
},
|
|
}),
|
|
String(" efg")]);
|
|
}
|
|
}
|