1 files changed, 142 insertions, 0 deletions

diff --git a/crates/ra_syntax/src/syntax_node/syntax_error.rs b/crates/ra_syntax/src/syntax_node/syntax_error.rs
new file mode 100644
index 000000000..412cf82cc
--- /dev/null
+++ b/crates/ra_syntax/src/syntax_node/syntax_error.rs
@@ -0,0 +1,142 @@
+use std::fmt;
+
+use crate::{TextRange, TextUnit};
+
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct SyntaxError {
+    kind: SyntaxErrorKind,
+    location: Location,
+}
+
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub enum Location {
+    Offset(TextUnit),
+    Range(TextRange),
+}
+
+impl Into<Location> for TextUnit {
+    fn into(self) -> Location {
+        Location::Offset(self)
+    }
+}
+
+impl Into<Location> for TextRange {
+    fn into(self) -> Location {
+        Location::Range(self)
+    }
+}
+
+impl SyntaxError {
+    pub fn new<L: Into<Location>>(kind: SyntaxErrorKind, loc: L) -> SyntaxError {
+        SyntaxError { kind, location: loc.into() }
+    }
+
+    pub fn kind(&self) -> SyntaxErrorKind {
+        self.kind.clone()
+    }
+
+    pub fn location(&self) -> Location {
+        self.location.clone()
+    }
+
+    pub fn offset(&self) -> TextUnit {
+        match self.location {
+            Location::Offset(offset) => offset,
+            Location::Range(range) => range.start(),
+        }
+    }
+
+    pub fn add_offset(mut self, plus_offset: TextUnit) -> SyntaxError {
+        self.location = match self.location {
+            Location::Range(range) => Location::Range(range + plus_offset),
+            Location::Offset(offset) => Location::Offset(offset + plus_offset),
+        };
+
+        self
+    }
+}
+
+impl fmt::Display for SyntaxError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        self.kind.fmt(f)
+    }
+}
+
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub enum SyntaxErrorKind {
+    ParseError(ParseError),
+    UnescapedCodepoint,
+    EmptyChar,
+    UnclosedChar,
+    OverlongChar,
+    EmptyByte,
+    UnclosedByte,
+    OverlongByte,
+    ByteOutOfRange,
+    UnescapedByte,
+    EmptyByteEscape,
+    InvalidByteEscape,
+    TooShortByteCodeEscape,
+    MalformedByteCodeEscape,
+    UnicodeEscapeForbidden,
+    EmptyAsciiEscape,
+    InvalidAsciiEscape,
+    TooShortAsciiCodeEscape,
+    AsciiCodeEscapeOutOfRange,
+    MalformedAsciiCodeEscape,
+    UnclosedUnicodeEscape,
+    MalformedUnicodeEscape,
+    EmptyUnicodeEcape,
+    OverlongUnicodeEscape,
+    UnicodeEscapeOutOfRange,
+    UnclosedString,
+    InvalidSuffix,
+    InvalidBlockAttr,
+}
+
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct ParseError(pub String);
+
+impl fmt::Display for SyntaxErrorKind {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        use self::SyntaxErrorKind::*;
+        match self {
+            UnescapedCodepoint => write!(f, "This codepoint should always be escaped"),
+            EmptyAsciiEscape => write!(f, "Empty escape sequence"),
+            InvalidAsciiEscape => write!(f, "Invalid escape sequence"),
+            EmptyChar => write!(f, "Empty char literal"),
+            UnclosedChar => write!(f, "Unclosed char literal"),
+            OverlongChar => write!(f, "Char literal should be one character long"),
+            EmptyByte => write!(f, "Empty byte literal"),
+            UnclosedByte => write!(f, "Unclosed byte literal"),
+            OverlongByte => write!(f, "Byte literal should be one character long"),
+            ByteOutOfRange => write!(f, "Byte should be a valid ASCII character"),
+            UnescapedByte => write!(f, "This byte should always be escaped"),
+            EmptyByteEscape => write!(f, "Empty escape sequence"),
+            InvalidByteEscape => write!(f, "Invalid escape sequence"),
+            TooShortByteCodeEscape => write!(f, "Escape sequence should have two digits"),
+            MalformedByteCodeEscape => write!(f, "Escape sequence should be a hexadecimal number"),
+            UnicodeEscapeForbidden => {
+                write!(f, "Unicode escapes are not allowed in byte literals or byte strings")
+            }
+            TooShortAsciiCodeEscape => write!(f, "Escape sequence should have two digits"),
+            AsciiCodeEscapeOutOfRange => {
+                write!(f, "Escape sequence should be between \\x00 and \\x7F")
+            }
+            MalformedAsciiCodeEscape => write!(f, "Escape sequence should be a hexadecimal number"),
+            UnclosedUnicodeEscape => write!(f, "Missing `}}`"),
+            MalformedUnicodeEscape => write!(f, "Malformed unicode escape sequence"),
+            EmptyUnicodeEcape => write!(f, "Empty unicode escape sequence"),
+            OverlongUnicodeEscape => {
+                write!(f, "Unicode escape sequence should have at most 6 digits")
+            }
+            UnicodeEscapeOutOfRange => write!(f, "Unicode escape code should be at most 0x10FFFF"),
+            UnclosedString => write!(f, "Unclosed string literal"),
+            InvalidSuffix => write!(f, "Invalid literal suffix"),
+            InvalidBlockAttr => {
+                write!(f, "A block in this position cannot accept inner attributes")
+            }
+            ParseError(msg) => write!(f, "{}", msg.0),
+        }
+    }
+}