github.com/TIBCOSoftware/flogo-lib@v0.5.9/core/mapper/exprmapper/expression/operatorprecedence_test.go (about)

     1  package expression
     2  
     3  import (
     4  	"github.com/stretchr/testify/assert"
     5  	"testing"
     6  )
     7  
     8  func TestOperatorPrecedenceForMulAdd(t *testing.T) {
     9  
    10  	v, err := ParseExpression(`1 + 2 * 3 + 2 * 6 / 2`)
    11  	if err != nil {
    12  		t.Fatal(err)
    13  		t.Failed()
    14  	}
    15  	vv, err := v.EvalWithScope(nil, nil)
    16  	assert.Nil(t, err)
    17  	assert.Equal(t, 13, vv)
    18  
    19  	v, err = ParseExpression(` 1 + 4 * 5 + -6 `)
    20  	if err != nil {
    21  		t.Fatal(err)
    22  		t.Failed()
    23  	}
    24  	vv, err = v.EvalWithScope(nil, nil)
    25  	assert.Nil(t, err)
    26  	assert.Equal(t, 15, vv)
    27  
    28  	v, err = ParseExpression(` 2 < 3 && 5 > 4 && 6 < 7 && 56 > 44`)
    29  	if err != nil {
    30  		t.Fatal(err)
    31  		t.Failed()
    32  	}
    33  	vv, err = v.EvalWithScope(nil, nil)
    34  	assert.Nil(t, err)
    35  	assert.Equal(t, true, vv)
    36  
    37  	v, err = ParseExpression(` 2 < 3 && 5 > 4 ||  6 < 7 && 56 < 44`)
    38  	if err != nil {
    39  		t.Fatal(err)
    40  		t.Failed()
    41  	}
    42  	vv, err = v.EvalWithScope(nil, nil)
    43  	assert.Nil(t, err)
    44  	assert.Equal(t, true, vv)
    45  
    46  }
    47  
    48  func TestOperatorNegative(t *testing.T) {
    49  	v, err := ParseExpression(`3-2`)
    50  	if err != nil {
    51  		t.Fatal(err)
    52  		t.Failed()
    53  	}
    54  	vv, err := v.EvalWithScope(nil, nil)
    55  	assert.Nil(t, err)
    56  	assert.Equal(t, 1, vv)
    57  
    58  	v, err = ParseExpression(`3 - 2`)
    59  	if err != nil {
    60  		t.Fatal(err)
    61  		t.Failed()
    62  	}
    63  	vv, err = v.EvalWithScope(nil, nil)
    64  	assert.Nil(t, err)
    65  	assert.Equal(t, 1, vv)
    66  
    67  	v, err = ParseExpression(`3+-2`)
    68  	if err != nil {
    69  		t.Fatal(err)
    70  		t.Failed()
    71  	}
    72  	vv, err = v.EvalWithScope(nil, nil)
    73  	assert.Nil(t, err)
    74  	assert.Equal(t, 1, vv)
    75  	v, err = ParseExpression(`3- -2`)
    76  	if err != nil {
    77  		t.Fatal(err)
    78  		t.Failed()
    79  	}
    80  	vv, err = v.EvalWithScope(nil, nil)
    81  	assert.Nil(t, err)
    82  	assert.Equal(t, 5, vv)
    83  }