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| author | Ryo Nihei <nihei.dev@gmail.com> | 2021-04-24 17:52:10 +0900 |
|---|---|---|
| committer | Ryo Nihei <nihei.dev@gmail.com> | 2021-04-24 23:32:55 +0900 |
| commit | 5708644933b364ffbcc625c2010e051ca031e867 (patch) | |
| tree | 53c458938cd685b7c77a3d638920a083effc7dee /compiler/syntax_error.go | |
| parent | Add validation of lexical specs and improve error messages (diff) | |
| download | tre-5708644933b364ffbcc625c2010e051ca031e867.tar.gz tre-5708644933b364ffbcc625c2010e051ca031e867.tar.xz | |
Add code point expression (Meet RL1.1 of UTS #18)
\u{hex string} matches a character has the code point represented by the hex string.
For instance, \u{3042} matches hiragana あ (U+3042). The hex string must have 4 or 6 digits.
This feature meets RL1.1 of UTS #18.
RL1.1 Hex Notation: https://unicode.org/reports/tr18/#RL1.1
Diffstat (limited to 'compiler/syntax_error.go')
| -rw-r--r-- | compiler/syntax_error.go | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/compiler/syntax_error.go b/compiler/syntax_error.go index be2dc38..df8977d 100644 --- a/compiler/syntax_error.go +++ b/compiler/syntax_error.go @@ -20,6 +20,7 @@ var ( // lexical errors synErrIncompletedEscSeq = newSyntaxError("incompleted escape sequence; unexpected EOF following \\") synErrInvalidEscSeq = newSyntaxError("invalid escape sequence") + synErrInvalidCodePoint = newSyntaxError("code points must consist of just 4 or 6 hex digits") // syntax errors synErrUnexpectedToken = newSyntaxError("unexpected token") @@ -34,4 +35,6 @@ var ( synErrBExpUnclosed = newSyntaxError("unclosed bracket expression") synErrBExpInvalidForm = newSyntaxError("invalid bracket expression") synErrRangeInvalidOrder = newSyntaxError("a range expression with invalid order") + synErrCPExpInvalidForm = newSyntaxError("invalid code point expression") + synErrCPExpOutOfRange = newSyntaxError("a code point must be between U+0000 to U+10FFFF") ) |