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path: root/src/urubu/grammar/semantic_error.go
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Diffstat (limited to 'src/urubu/grammar/semantic_error.go')
-rw-r--r--src/urubu/grammar/semantic_error.go30
1 files changed, 30 insertions, 0 deletions
diff --git a/src/urubu/grammar/semantic_error.go b/src/urubu/grammar/semantic_error.go
new file mode 100644
index 0000000..88a6b17
--- /dev/null
+++ b/src/urubu/grammar/semantic_error.go
@@ -0,0 +1,30 @@
+package grammar
+
+import "errors"
+
+var (
+ semErrNoGrammarName = errors.New("name is missing")
+ semErrSpellingInconsistency = errors.New("the identifiers are treated as the same. please use the same spelling")
+ semErrDuplicateAssoc = errors.New("associativity and precedence cannot be specified multiple times for a symbol")
+ semErrUndefinedPrec = errors.New("symbol must has precedence")
+ semErrUndefinedOrdSym = errors.New("undefined ordered symbol")
+ semErrUnusedProduction = errors.New("unused production")
+ semErrUnusedTerminal = errors.New("unused terminal")
+ semErrTermCannotBeSkipped = errors.New("a terminal used in productions cannot be skipped")
+ semErrNoProduction = errors.New("a grammar needs at least one production")
+ semErrUndefinedSym = errors.New("undefined symbol")
+ semErrDuplicateProduction = errors.New("duplicate production")
+ semErrDuplicateTerminal = errors.New("duplicate terminal")
+ semErrDuplicateFragment = errors.New("duplicate fragment")
+ semErrDuplicateName = errors.New("duplicate names are not allowed between terminals and non-terminals")
+ semErrErrSymIsReserved = errors.New("symbol 'error' is reserved as a terminal symbol")
+ semErrDuplicateLabel = errors.New("a label must be unique in an alternative")
+ semErrInvalidLabel = errors.New("a label must differ from terminal symbols or non-terminal symbols")
+ semErrDirInvalidName = errors.New("invalid directive name")
+ semErrDirInvalidParam = errors.New("invalid parameter")
+ semErrDuplicateDir = errors.New("a directive must not be duplicated")
+ semErrDuplicateElem = errors.New("duplicate element")
+ semErrAmbiguousElem = errors.New("ambiguous element")
+ semErrInvalidProdDir = errors.New("invalid production directive")
+ semErrInvalidAltDir = errors.New("invalid alternative directive")
+)