From 8bb321f8b032dfaeffbe3d1b8dfeb215c12d3642 Mon Sep 17 00:00:00 2001
From: "Juan J. Martinez" <jjm@usebox.net>
Date: Mon, 18 Jul 2022 07:45:58 +0100
Subject: First public release

---
 errors/errors.go | 106 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 106 insertions(+)
 create mode 100644 errors/errors.go

(limited to 'errors')

diff --git a/errors/errors.go b/errors/errors.go
new file mode 100644
index 0000000..a8d1eb0
--- /dev/null
+++ b/errors/errors.go
@@ -0,0 +1,106 @@
+package errors
+
+import (
+	"fmt"
+	"strings"
+
+	"usebox.net/lang/tokens"
+)
+
+type ErrCode int
+
+const (
+	Unimplemented ErrCode = iota
+	SyntaxError
+	IncompleteEscape
+	InvalidChar
+	ExpectedIdent
+	ExpectedType
+	AlreadyDeclared
+	Undefined
+	ExpectedSemicolon
+	ExpectedComma
+	ExpectedExpr
+	ExpectedLParen
+	ExpectedRParen
+	ExpectedLBrace
+	ExpectedRBrace
+	ExpectedIn
+	ExpectedRBracket
+	ExpectedAssign
+	ExpectedDefinition
+	AssignConst
+	FailedNumeric
+	InvalidOperation
+	InvalidValue
+	InvalidLength
+	InvalidIndex
+	InvalidType
+	TypeMismatch
+	InvalidTarget
+	UndefinedIdent
+	NotCallable
+	NotIndexable
+	NotStruct
+	InvalidNumberArgs
+	CallError
+	NoReturn
+	TailCallError
+	RecursiveStruct
+	Unexpected
+)
+
+type Error struct {
+	Code    ErrCode
+	Message string
+	Err     error
+}
+
+func (e Error) Error() string {
+	return e.Message
+}
+
+func (e Error) Unwrap() error {
+	return e.Err
+}
+
+func formatError(loc tokens.Location, msg ...string) string {
+	return fmt.Sprintf("%s:%d col %d error: %s", loc.File, loc.Line, loc.Column, strings.Join(msg, " "))
+}
+
+func NewError(code ErrCode, loc tokens.Location, msg ...string) error {
+	return Error{
+		Code:    code,
+		Message: formatError(loc, msg...),
+	}
+}
+
+func NewErrorWrap(code ErrCode, loc tokens.Location, err error, msg ...string) error {
+	return Error{
+		Code:    code,
+		Message: formatError(loc, msg...),
+		Err:     err,
+	}
+}
+
+type ErrorList struct {
+	Errors []error
+}
+
+func (el ErrorList) Error() string {
+	var b strings.Builder
+	var nerrors = len(el.Errors)
+
+	for i := 0; i < nerrors; i++ {
+		fmt.Fprint(&b, el.Errors[i])
+		if i == 10 {
+			fmt.Fprintf(&b, "\n...")
+			break
+		}
+		if i < nerrors-1 {
+			fmt.Fprintln(&b)
+		}
+	}
+
+	return b.String()
+}
-- 
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