1 files changed, 72 insertions, 0 deletions
diff --git a/defaults.go b/defaults.go
new file mode 100644
index 0000000..b450e62
--- /dev/null
+++ b/defaults.go
@@ -0,0 +1,72 @@
+// Copyright (c) 2020 Alexander Kiryukhin <a.kiryukhin@mail.ru>
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package executor
+
+import "math"
+
+// MathOperators is default set for math expressions
+var MathOperators = []*Operator{
+	{Op: "+", Assoc: LeftAssoc, Priority: 10, Fn: func(a float64, b float64) (float64, error) { return a + b, nil }},
+	{Op: "-", Assoc: LeftAssoc, Priority: 10, Fn: func(a float64, b float64) (float64, error) { return a - b, nil }},
+	{Op: "*", Assoc: LeftAssoc, Priority: 20, Fn: func(a float64, b float64) (float64, error) { return a * b, nil }},
+	{Op: "/", Assoc: LeftAssoc, Priority: 20, Fn: func(a float64, b float64) (float64, error) { return a / b, nil }},
+	{Op: "^", Assoc: RightAssoc, Priority: 30, Fn: func(a, b float64) (float64, error) { return math.Pow(a, b), nil }},
+}
+
+// LogicOperators is default set for logic expressions
+var LogicOperators = []*Operator{
+	{Op: "==", Assoc: LeftAssoc, Priority: 0, Fn: func(a float64, b float64) (float64, error) {
+		if a == b {
+			return 1, nil
+		}
+		return 0, nil
+	}},
+	{Op: "!=", Assoc: LeftAssoc, Priority: 0, Fn: func(a float64, b float64) (float64, error) {
+		if a != b {
+			return 1, nil
+		}
+		return 0, nil
+	}},
+	{Op: ">", Assoc: LeftAssoc, Priority: 0, Fn: func(a float64, b float64) (float64, error) {
+		if a > b {
+			return 1, nil
+		}
+		return 0, nil
+	}},
+	{Op: "<", Assoc: LeftAssoc, Priority: 0, Fn: func(a float64, b float64) (float64, error) {
+		if a < b {
+			return 1, nil
+		}
+		return 0, nil
+	}},
+	{Op: ">=", Assoc: LeftAssoc, Priority: 0, Fn: func(a float64, b float64) (float64, error) {
+		if a >= b {
+			return 1, nil
+		}
+		return 0, nil
+	}},
+	{Op: "<=", Assoc: LeftAssoc, Priority: 0, Fn: func(a float64, b float64) (float64, error) {
+		if a <= b {
+			return 1, nil
+		}
+		return 0, nil
+	}},
+}