Add support for numbers with underscores
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parent
95085dba9a
commit
26da27e628
107
src/parser.rs
107
src/parser.rs
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@ -8,6 +8,10 @@ use std::str;
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use Table as TomlTable;
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use Value::{self, Array, Table, Float, Integer, Boolean, Datetime};
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macro_rules! try {
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($e:expr) => (match $e { Some(s) => s, None => return None })
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}
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/// Parser for converting a string to a TOML `Value` instance.
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///
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/// This parser contains the string slice that is being parsed, and exports the
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@ -487,21 +491,31 @@ impl<'a> Parser<'a> {
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fn number_or_datetime(&mut self, start: usize) -> Option<Value> {
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let mut is_float = false;
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if !self.integer(start, false, true) { return None }
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if self.eat('.') {
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let prefix = try!(self.integer(start, false, true));
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let decimal = if self.eat('.') {
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is_float = true;
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if !self.integer(start, true, false) { return None }
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}
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if self.eat('e') || self.eat('E') {
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Some(try!(self.integer(start, true, false)))
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} else {
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None
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};
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let exponent = if self.eat('e') || self.eat('E') {
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is_float = true;
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if !self.integer(start, false, true) { return None }
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}
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Some(try!(self.integer(start, false, true)))
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} else {
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None
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};
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let end = self.next_pos();
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let input = &self.input[start..end];
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let ret = if !is_float && !input.starts_with("+") &&
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!input.starts_with("-") && self.eat('-') {
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self.datetime(start, end + 1)
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} else {
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let input = match (decimal, exponent) {
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(None, None) => prefix,
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(Some(ref d), None) => prefix + "." + d,
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(None, Some(ref e)) => prefix + "E" + e,
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(Some(ref d), Some(ref e)) => prefix + "." + d + "E" + e,
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};
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let input = input.trim_left_matches('+');
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if is_float {
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input.parse().ok().map(Float)
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@ -520,10 +534,15 @@ impl<'a> Parser<'a> {
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}
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fn integer(&mut self, start: usize, allow_leading_zeros: bool,
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allow_sign: bool) -> bool {
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allow_sign && (self.eat('-') || self.eat('+'));
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allow_sign: bool) -> Option<String> {
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let mut s = String::new();
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if allow_sign {
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if self.eat('-') { s.push('-'); }
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else if self.eat('+') { s.push('+'); }
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}
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match self.cur.next() {
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Some((_, '0')) if !allow_leading_zeros => {
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s.push('0');
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match self.peek(0) {
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Some((pos, c)) if '0' <= c && c <= '9' => {
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self.errors.push(ParserError {
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@ -531,12 +550,14 @@ impl<'a> Parser<'a> {
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hi: pos,
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desc: format!("leading zeroes are not allowed"),
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});
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return false
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return None
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}
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_ => {}
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}
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}
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Some((_, ch)) if '0' <= ch && ch <= '9' => {}
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Some((_, ch)) if '0' <= ch && ch <= '9' => {
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s.push(ch);
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}
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_ => {
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let pos = self.next_pos();
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self.errors.push(ParserError {
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@ -544,16 +565,35 @@ impl<'a> Parser<'a> {
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hi: pos,
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desc: format!("expected start of a numeric literal"),
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});
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return false;
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return None;
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}
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}
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let mut underscore = false;
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loop {
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match self.cur.clone().next() {
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Some((_, ch)) if '0' <= ch && ch <= '9' => { self.cur.next(); }
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Some((_, ch)) if '0' <= ch && ch <= '9' => {
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s.push(ch);
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self.cur.next();
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underscore = false;
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}
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Some((_, '_')) if !underscore => {
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self.cur.next();
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underscore = true;
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}
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Some(_) | None => break,
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}
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}
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true
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if underscore {
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let pos = self.next_pos();
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self.errors.push(ParserError {
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lo: pos,
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hi: pos,
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desc: format!("numeral cannot end with an underscore"),
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});
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return None
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} else {
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Some(s)
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}
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}
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fn boolean(&mut self, start: usize) -> Option<Value> {
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@ -647,10 +687,7 @@ impl<'a> Parser<'a> {
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// Attempt to parse a value, triggering an error if it's the wrong
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// type.
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let start = self.next_pos();
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let value = match self.value() {
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Some(v) => v,
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None => return None,
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};
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let value = try!(self.value());
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let end = self.next_pos();
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let expected = type_str.unwrap_or(value.type_str());
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if value.type_str() != expected {
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@ -681,9 +718,9 @@ impl<'a> Parser<'a> {
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if self.eat('}') { return Some(Table(ret)) }
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loop {
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let lo = self.next_pos();
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let key = match self.key_name() { Some(s) => s, None => return None };
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let key = try!(self.key_name());
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if !self.keyval_sep() { return None }
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let value = match self.value() { Some(v) => v, None => return None };
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let value = try!(self.value());
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self.insert(&mut ret, key, value, lo);
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self.ws();
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@ -1102,6 +1139,9 @@ trimmed in raw strings.
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t!("2e10", 2e10);
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t!("2e+10", 2e10);
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t!("2e-10", 2e-10);
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t!("2_0.0", 20.0);
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t!("2_0.0_0e0_0", 20.0);
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t!("2_0.1_0e1_0", 20.1e10);
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}
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#[test]
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@ -1193,4 +1233,31 @@ trimmed in raw strings.
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assert!(Parser::new("a = {\"a\"=[\n]}").parse().is_some());
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assert!(Parser::new("a = [\n{},\n{},\n]").parse().is_some());
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}
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#[test]
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fn number_underscores() {
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macro_rules! t {
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($actual:expr, $expected:expr) => ({
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let f = format!("foo = {}", $actual);
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let mut p = Parser::new(&f[]);
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let table = Table(p.parse().unwrap());
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assert_eq!(table.lookup("foo").and_then(|k| k.as_integer()),
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Some($expected));
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})
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}
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t!("1_0", 10);
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t!("1_0_0", 100);
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t!("1_000", 1000);
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t!("+1_000", 1000);
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t!("-1_000", -1000);
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}
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#[test]
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fn bad_underscores() {
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assert!(Parser::new("foo = 0_").parse().is_none());
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assert!(Parser::new("foo = 0__0").parse().is_none());
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assert!(Parser::new("foo = __0").parse().is_none());
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assert!(Parser::new("foo = 1_0_").parse().is_none());
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}
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}
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