Add more error checking
This commit is contained in:
Timothy Warren
parent
da888b743b
commit
9af3bd629c
288
src/lib.rs
288
src/lib.rs
@ -61,18 +61,18 @@ impl From<JSONValue> for JSONMap {
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fn from(val: JSONValue) -> JSONMap {
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match val {
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JSONValue::Object(o) => o,
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_ => panic!("Invalid type conversion")
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_ => unreachable!(),
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}
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}
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}
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impl From<JSONValue> for JSONArray{
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impl From<JSONValue> for JSONArray {
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/// Extracts the `Vec` in the `JSONValue` enum, if it exists.
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/// Otherwise, panics.
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fn from(val: JSONValue) -> JSONArray {
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match val {
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JSONValue::Array(a) => a,
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_ => panic!("Invalid type conversion")
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_ => unreachable!(),
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}
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}
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}
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@ -83,7 +83,7 @@ impl From<JSONValue> for f64 {
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fn from(val: JSONValue) -> f64 {
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match val {
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JSONValue::Number(n) => n,
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_ => panic!("Invalid type conversion")
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_ => unreachable!(),
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}
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}
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}
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@ -94,7 +94,7 @@ impl From<JSONValue> for String {
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fn from(val: JSONValue) -> String {
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match val {
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JSONValue::String(s) => s,
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_ => panic!("Invalid type conversion")
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_ => unreachable!(),
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}
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}
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}
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@ -106,14 +106,16 @@ impl From<JSONValue> for bool {
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match val {
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JSONValue::True => true,
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JSONValue::False => false,
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_ => panic!("Invalid type conversion")
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_ => unreachable!(),
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}
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}
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}
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impl From<JSONValue> for () {
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/// This will just swallow the enum value and return a unit tuple
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fn from(_: JSONValue) -> () { () }
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fn from(_: JSONValue) -> () {
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()
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}
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}
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impl From<JSONMap> for JSONValue {
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@ -245,7 +247,9 @@ impl JSON {
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);
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// Every parser failed, so the syntax is probably incorrect
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Err(ParseError::UnexpectedEndOfInput(format!("Doesn't seem to be valid JSON")))
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Err(ParseError::UnexpectedEndOfInput(format!(
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"Doesn't seem to be valid JSON"
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)))
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}
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/// See if there's a `JSONValue::Object` next in the JSON
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@ -270,20 +274,21 @@ impl JSON {
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if initial == false {
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self.eat(',')?;
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self.skip_whitespace();
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} else {
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self.skip_whitespace();
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}
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let maybe_key = self.parse_string()?;
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if maybe_key.is_none() {
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return Err(ParseError::ExpectedObjectKey(format!(
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"Expected an object key. Does the object have a trailing comma?"
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)));
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}
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self.skip_whitespace();
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let key = match self.parse_string()? {
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Some(value) => match value {
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JSONValue::String(s) => s,
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_ => panic!("parse_string returned non-string value"),
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},
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None => String::new(),
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};
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self.skip_whitespace();
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self.eat(':')?;
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let key = maybe_key.unwrap().into();
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let value = self.parse_value()?;
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result.insert(key, value);
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@ -293,6 +298,7 @@ impl JSON {
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self.skip_whitespace();
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}
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self.expect_not_end('}')?;
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// Move to the next character: '}'
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self.increment(1);
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@ -322,6 +328,7 @@ impl JSON {
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initial = false;
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}
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self.expect_not_end(']')?;
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// move to next character: ']'
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self.increment(1);
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@ -360,22 +367,31 @@ impl JSON {
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};
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result.push(ch);
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self.increment(1);
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} else if ch == 'u'
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&& self.chars[self.i + 2].is_ascii_hexdigit()
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&& self.chars[self.i + 3].is_ascii_hexdigit()
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&& self.chars[self.i + 4].is_ascii_hexdigit()
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&& self.chars[self.i + 5].is_ascii_hexdigit()
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{
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// Blech, parse out a JSON unicode (utf16) escape code. Handles surrogate pairs
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// by giving you the replacement character...because...yeah
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let char_str = String::from_iter(&self.chars[self.i + 2..=self.i + 5]);
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let code = u16::from_str_radix(&char_str, 16)
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.expect("Failed to parse unicode escape number");
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let string = String::from_utf16_lossy(&[code]);
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} else if ch == 'u' {
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if self.chars[self.i + 2].is_ascii_hexdigit()
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&& self.chars[self.i + 3].is_ascii_hexdigit()
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&& self.chars[self.i + 4].is_ascii_hexdigit()
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&& self.chars[self.i + 5].is_ascii_hexdigit()
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{
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// Blech, parse out a JSON unicode (utf16) escape code. Handles surrogate pairs
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// by giving you the replacement character...because...yeah
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let char_str = String::from_iter(&self.chars[self.i + 2..=self.i + 5]);
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let code = u16::from_str_radix(&char_str, 16)
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.expect("Failed to parse unicode escape number");
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let string = String::from_utf16_lossy(&[code]);
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result.push_str(&string);
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result.push_str(&string);
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self.increment(5);
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self.increment(5);
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} else {
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return Err(ParseError::ExpectedUnicodeEscape(format!(
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"Expected a unicode escape sequence"
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)));
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}
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} else {
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return Err(ParseError::ExpectedEscapeChar(format!(
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"Expected an escape sequence"
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)));
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}
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} else {
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result.push(self.chars[self.i]);
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@ -383,7 +399,8 @@ impl JSON {
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self.increment(1);
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}
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self.eat('"')?;
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self.expect_not_end('"')?;
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self.increment(1);
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Ok(Some(JSONValue::from(result)))
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}
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@ -404,6 +421,7 @@ impl JSON {
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// Minus sign
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if self.chars[n] == '-' && n < max {
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n += 1;
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self.expect_digit(start, n)?;
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}
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// Integer Part
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@ -414,6 +432,7 @@ impl JSON {
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// Decimal Part
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if self.chars[n] == '.' && n < max {
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n += 1;
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self.expect_digit(start, n)?;
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while self.chars[n].is_ascii_digit() && n < max {
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n += 1;
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}
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@ -428,6 +447,7 @@ impl JSON {
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}
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// Exponent base
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self.expect_digit(start, n)?;
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while self.chars[n].is_ascii_digit() && n < max {
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n += 1;
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}
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@ -512,6 +532,31 @@ impl JSON {
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}
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}
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/// Check that the next character is a digit. If not, return ParseError.
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fn expect_digit(&mut self, start: usize, end: usize) -> Result<(), ParseError> {
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let current = String::from_iter(&self.chars[start..end]);
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if !self.chars[end].is_ascii_digit() {
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Err(ParseError::ExpectedDigit(format!(
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"Expected a digit, received '{}' after numeric '{}'",
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self.chars[end], current
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)))
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} else {
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Ok(())
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}
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}
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/// Verify that we are not at the end of the input string
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fn expect_not_end(&mut self, ch: char) -> Result<(), ParseError> {
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if self.i == self.chars.len() {
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Err(ParseError::UnexpectedEndOfInput(format!(
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"Unexpected end of input. Expected '{}'",
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ch
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)))
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} else {
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Ok(())
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}
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}
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/// Convert a `&str` containing JSON into a `Result<JSONValue, ParseError>`
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pub fn parse(json: &str) -> JSONResult {
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JSON::new(json).parse_value()
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@ -520,7 +565,7 @@ impl JSON {
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#[cfg(test)]
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mod tests {
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use super::JSONValue::{Array, False, Null, Number, Object, True};
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use super::JSONValue::{Array, Number, True};
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use super::*;
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#[test]
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@ -528,7 +573,11 @@ mod tests {
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let map: JSONMap = HashMap::new();
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let num = 9.380831539;
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let str = "applesauce";
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let arr: JSONArray = vec![JSONValue::from(map.clone()), JSONValue::from(num), JSONValue::from(str)];
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let arr: JSONArray = vec![
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JSONValue::from(map.clone()),
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JSONValue::from(num),
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JSONValue::from(str),
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];
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assert_eq!(map.clone(), JSONMap::from(JSONValue::from(map.clone())));
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assert_eq!(num, f64::from(JSONValue::from(num)));
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@ -544,7 +593,11 @@ mod tests {
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let map: JSONMap = HashMap::new();
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let num = 9.380831539;
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let str = "applesauce";
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let arr: JSONArray = vec![JSONValue::from(map.clone()), JSONValue::from(num), JSONValue::from(str)];
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let arr: JSONArray = vec![
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JSONValue::from(map.clone()),
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JSONValue::from(num),
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JSONValue::from(str),
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];
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let s: String = JSONValue::from(str).unwrap();
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let a: JSONArray = JSONValue::from(arr.clone()).unwrap();
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@ -597,9 +650,6 @@ mod tests {
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let res = JSON::new(r#""foo""#).parse_number();
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assert_eq!(res, Ok(None));
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let res = JSON::new("3.14159").parse_number();
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assert_eq!(res, Ok(Some(Number(3.14159f64))));
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let res = JSON::new("3e4").parse_number();
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assert_eq!(res, Ok(Some(Number(3e4f64))));
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@ -607,13 +657,6 @@ mod tests {
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assert_eq!(res, Ok(Some(Number(1.234f64))));
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}
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#[test]
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fn can_parse_array_of_keywords() {
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let result = JSON::parse("[true,false,null]");
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assert_eq!(result, Ok(Array(vec![True, False, Null])));
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}
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#[test]
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fn parse_object() {
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let result = JSON::new(r#"{"foo": "bar"}"#).parse_object();
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@ -623,157 +666,4 @@ mod tests {
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assert_eq!(result, Ok(Some(JSONValue::Object(hash_map))));
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}
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#[test]
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fn parse_json_types() {
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// Boolean / Null
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let res = JSON::parse("true");
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assert_eq!(res, Ok(True));
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let res = JSON::parse("false");
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assert_eq!(res, Ok(False));
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let res = JSON::parse("null");
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assert_eq!(res, Ok(Null));
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// Number
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let res = JSON::parse("9.38083151965");
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assert_eq!(res, Ok(Number(9.38083151965)), "Failed to parse number");
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// String
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let res = JSON::parse(r#""/^$/""#);
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assert_eq!(
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res,
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Ok(JSONValue::from("/^$/")),
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"Failed to parse string"
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);
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// Number array
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let res = JSON::parse("[1, 2, 3]");
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assert_eq!(
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res,
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Ok(Array(vec![Number(1f64), Number(2f64), Number(3f64)]))
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);
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// Object array
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let result = JSON::parse("[{}]");
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assert_eq!(result, Ok(JSONValue::Array(vec![Object(HashMap::new())])));
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}
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#[test]
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fn parse_nested_object() {
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let res = JSON::parse(r#"{"a": {"b": []}}"#);
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let mut outermap: JSONMap = HashMap::new();
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let mut innermap: JSONMap = HashMap::new();
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innermap.insert(String::from("b"), Array(vec![]));
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outermap.insert(String::from("a"), Object(innermap));
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let expected = Ok(Object(outermap));
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assert_eq!(res, expected);
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}
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#[test]
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fn parse_object_with_number_values() {
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let result = JSON::parse(r#"[{ "a": 9.38083151965, "b": 4e3 }]"#);
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let mut map: JSONMap = HashMap::new();
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map.insert(String::from("a"), Number(9.38083151965f64));
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map.insert(String::from("b"), Number(4e3f64));
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let expected = Ok(Array(vec![Object(map)]));
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assert_eq!(
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result, expected,
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"Failed on just number values: {:#?}",
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result
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);
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}
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#[test]
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fn parse_weird_character_array() {
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let result =
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JSON::parse(r#"["\"", "\\", "/", "\b", "\f", "\n", "\r", "\t", "\u0001", "\uface"]"#);
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let expected = Ok(Array(vec![
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JSONValue::from("\""),
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JSONValue::from("\\"),
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JSONValue::from("/"),
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JSONValue::from("\u{8}"),
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JSONValue::from("\x0C"),
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JSONValue::from("\n"),
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JSONValue::from("\r"),
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JSONValue::from("\t"),
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JSONValue::from("\u{1}"),
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JSONValue::from("\u{face}"),
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]));
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assert_eq!(result, expected);
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}
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#[test]
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fn parse_full_json_example() {
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let result = JSON::parse(
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r#"[{
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"a": 9.38083151965,
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"b": 4e3,
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"c": [1, 2, 3],
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"d": "foo",
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"e": {
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"f": {
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"g": {
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"h": null
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}
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}
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},
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"i": ["\"", "\\", "/", "\b", "\f", "\n", "\r", "\t", "\u0001", "\uface"]
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}]"#,
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);
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let mut map: JSONMap = HashMap::new();
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let mut emap: JSONMap = HashMap::new();
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let mut fmap: JSONMap = HashMap::new();
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let mut gmap: JSONMap = HashMap::new();
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gmap.insert(String::from("h"), Null);
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fmap.insert(String::from("g"), Object(gmap));
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emap.insert(String::from("f"), Object(fmap));
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map.insert(String::from("a"), Number(9.38083151965f64));
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map.insert(String::from("b"), Number(4e3f64));
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map.insert(
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String::from("c"),
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Array(vec![Number(1f64), Number(2f64), Number(3f64)]),
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);
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map.insert(String::from("d"), JSONValue::from("foo"));
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map.insert(String::from("e"), Object(emap));
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map.insert(
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String::from("i"),
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Array(vec![
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JSONValue::from("\""),
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JSONValue::from("\\"),
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JSONValue::from("/"),
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JSONValue::from("\u{8}"),
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JSONValue::from("\x0C"),
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JSONValue::from("\n"),
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JSONValue::from("\r"),
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JSONValue::from("\t"),
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JSONValue::from("\u{1}"),
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JSONValue::from("\u{face}"),
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]),
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);
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assert!(result.is_ok(), format!("{:#?}", result));
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let outer_array: Vec<JSONValue> = result.unwrap().unwrap();
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let result_map: JSONMap = outer_array[0].clone().unwrap();
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for (k, v) in &map {
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assert_eq!(
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result_map.get(k).unwrap(),
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v,
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"HashMap Entry Differs: {:#?}, {:#?}",
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result_map.get(k).unwrap(),
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v
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);
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}
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}
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}
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