init repo

vendor/github.com/cloudwego/iasm/expr/utils.go

@@ -0,0 +1,77 @@
+//
+// Copyright 2024 CloudWeGo Authors
+//
+// 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 expr
+
+var op1ch = [...]bool {
+    '+': true,
+    '-': true,
+    '*': true,
+    '/': true,
+    '%': true,
+    '&': true,
+    '|': true,
+    '^': true,
+    '~': true,
+    '(': true,
+    ')': true,
+}
+
+var op2ch = [...]bool {
+    '*': true,
+    '<': true,
+    '>': true,
+}
+
+func neg2(v *Expr, err error) (*Expr, error) {
+    if err != nil {
+        return nil, err
+    } else {
+        return v.Neg(), nil
+    }
+}
+
+func not2(v *Expr, err error) (*Expr, error) {
+    if err != nil {
+        return nil, err
+    } else {
+        return v.Not(), nil
+    }
+}
+
+func isop1ch(ch rune) bool {
+    return ch >= 0 && int(ch) < len(op1ch) && op1ch[ch]
+}
+
+func isop2ch(ch rune) bool {
+    return ch >= 0 && int(ch) < len(op2ch) && op2ch[ch]
+}
+
+func isdigit(ch rune) bool {
+    return ch >= '0' && ch <= '9'
+}
+
+func isident(ch rune) bool {
+    return isdigit(ch) || isident0(ch)
+}
+
+func isident0(ch rune) bool {
+    return (ch == '_') || (ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z')
+}
+
+func ishexdigit(ch rune) bool {
+    return isdigit(ch) || (ch >= 'a' && ch <= 'f') || (ch >= 'A' && ch <= 'F')
+}