实现基础web服务器

vendor/github.com/bytedance/sonic/internal/decoder/errors.go

@@ -0,0 +1,181 @@
+/*
+ * Copyright 2021 ByteDance Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package decoder
+
+import (
+    `encoding/json`
+    `errors`
+    `fmt`
+    `reflect`
+    `strconv`
+    `strings`
+
+    `github.com/bytedance/sonic/internal/native/types`
+    `github.com/bytedance/sonic/internal/rt`
+)
+
+type SyntaxError struct {
+    Pos  int
+    Src  string
+    Code types.ParsingError
+    Msg  string
+}
+
+func (self SyntaxError) Error() string {
+    return fmt.Sprintf("%q", self.Description())
+}
+
+func (self SyntaxError) Description() string {
+    return "Syntax error " + self.description()
+}
+
+func (self SyntaxError) description() string {
+    i := 16
+    p := self.Pos - i
+    q := self.Pos + i
+
+    /* check for empty source */
+    if self.Src == "" {
+        return fmt.Sprintf("no sources available: %#v", self)
+    }
+
+    /* prevent slicing before the beginning */
+    if p < 0 {
+        p, q, i = 0, q - p, i + p
+    }
+
+    /* prevent slicing beyond the end */
+    if n := len(self.Src); q > n {
+        n = q - n
+        q = len(self.Src)
+
+        /* move the left bound if possible */
+        if p > n {
+            i += n
+            p -= n
+        }
+    }
+
+    /* left and right length */
+    x := clamp_zero(i)
+    y := clamp_zero(q - p - i - 1)
+
+    /* compose the error description */
+    return fmt.Sprintf(
+        "at index %d: %s\n\n\t%s\n\t%s^%s\n",
+        self.Pos,
+        self.Message(),
+        self.Src[p:q],
+        strings.Repeat(".", x),
+        strings.Repeat(".", y),
+    )
+}
+
+func (self SyntaxError) Message() string {
+    if self.Msg == "" {
+        return self.Code.Message()
+    }
+    return self.Msg
+}
+
+func clamp_zero(v int) int {
+    if v < 0 {
+        return 0
+    } else {
+        return v
+    }
+}
+
+/** JIT Error Helpers **/
+
+var stackOverflow = &json.UnsupportedValueError {
+    Str   : "Value nesting too deep",
+    Value : reflect.ValueOf("..."),
+}
+
+//go:nosplit
+func error_wrap(src string, pos int, code types.ParsingError) error {
+    return SyntaxError {
+        Pos  : pos,
+        Src  : src,
+        Code : code,
+    }
+}
+
+//go:nosplit
+func error_type(vt *rt.GoType) error {
+    return &json.UnmarshalTypeError{Type: vt.Pack()}
+}
+
+type MismatchTypeError struct {
+    Pos  int
+    Src  string
+    Type reflect.Type
+}
+
+func swithchJSONType (src string, pos int) string {
+    var val string
+    switch src[pos] {
+        case 'f': fallthrough
+        case 't': val = "bool"
+        case '"': val = "string"
+        case '{': val = "object"
+        case '[': val = "array"
+        case '-', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9': val = "number"        
+    }
+    return val
+}
+
+func (self MismatchTypeError) Error() string {
+    se := SyntaxError {
+        Pos  : self.Pos,
+        Src  : self.Src,
+        Code : types.ERR_MISMATCH,
+    }
+    return fmt.Sprintf("Mismatch type %s with value %s %q", self.Type.String(), swithchJSONType(self.Src, self.Pos), se.description())
+}
+
+func (self MismatchTypeError) Description() string {
+    se := SyntaxError {
+        Pos  : self.Pos,
+        Src  : self.Src,
+        Code : types.ERR_MISMATCH,
+    }
+    return fmt.Sprintf("Mismatch type %s with value %s %s", self.Type.String(), swithchJSONType(self.Src, self.Pos), se.description())
+}
+
+//go:nosplit
+func error_mismatch(src string, pos int, vt *rt.GoType) error {
+    return &MismatchTypeError {
+        Pos  : pos,
+        Src  : src,
+        Type : vt.Pack(),
+    }
+}
+
+//go:nosplit
+func error_field(name string) error {
+    return errors.New("json: unknown field " + strconv.Quote(name))
+}
+
+//go:nosplit
+func error_value(value string, vtype reflect.Type) error {
+    return &json.UnmarshalTypeError {
+        Type  : vtype,
+        Value : value,
+    }
+}