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131 lines
2.5 KiB
131 lines
2.5 KiB
package ast
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import (
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`fmt`
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`strings`
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`unsafe`
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`github.com/bytedance/sonic/internal/native/types`
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)
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func newError(err types.ParsingError, msg string) *Node {
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return &Node{
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t: V_ERROR,
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l: uint(err),
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p: unsafe.Pointer(&msg),
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}
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}
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// Error returns error message if the node is invalid
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func (self Node) Error() string {
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if self.t != V_ERROR {
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return ""
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} else {
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return *(*string)(self.p)
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}
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}
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func newSyntaxError(err SyntaxError) *Node {
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msg := err.Description()
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return &Node{
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t: V_ERROR,
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l: uint(err.Code),
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p: unsafe.Pointer(&msg),
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}
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}
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func (self *Parser) syntaxError(err types.ParsingError) SyntaxError {
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return SyntaxError{
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Pos : self.p,
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Src : self.s,
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Code: err,
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}
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}
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func unwrapError(err error) *Node {
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if se, ok := err.(*Node); ok {
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return se
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}else if sse, ok := err.(Node); ok {
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return &sse
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} else {
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msg := err.Error()
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return &Node{
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t: V_ERROR,
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p: unsafe.Pointer(&msg),
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}
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}
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}
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type SyntaxError struct {
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Pos int
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Src string
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Code types.ParsingError
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Msg string
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}
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func (self SyntaxError) Error() string {
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return fmt.Sprintf("%q", self.Description())
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}
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func (self SyntaxError) Description() string {
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return "Syntax error " + self.description()
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}
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func (self SyntaxError) description() string {
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i := 16
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p := self.Pos - i
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q := self.Pos + i
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/* check for empty source */
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if self.Src == "" {
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return fmt.Sprintf("no sources available: %#v", self)
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}
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/* prevent slicing before the beginning */
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if p < 0 {
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p, q, i = 0, q - p, i + p
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}
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/* prevent slicing beyond the end */
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if n := len(self.Src); q > n {
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n = q - n
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q = len(self.Src)
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/* move the left bound if possible */
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if p > n {
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i += n
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p -= n
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}
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}
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/* left and right length */
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x := clamp_zero(i)
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y := clamp_zero(q - p - i - 1)
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/* compose the error description */
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return fmt.Sprintf(
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"at index %d: %s\n\n\t%s\n\t%s^%s\n",
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self.Pos,
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self.Message(),
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self.Src[p:q],
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strings.Repeat(".", x),
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strings.Repeat(".", y),
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)
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}
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func (self SyntaxError) Message() string {
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if self.Msg == "" {
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return self.Code.Message()
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}
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return self.Msg
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}
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func clamp_zero(v int) int {
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if v < 0 {
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return 0
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} else {
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return v
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}
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}
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