Fix #701, init new formula function AND and OR, prevent formula lexer panic on retrieving the top token type

4 files changed, 337 insertions, 89 deletions

diff --git a/calc.go b/calc.go
index 7b9785c..111bc60 100644
--- a/calc.go
+++ b/calc.go
@@ -93,21 +93,36 @@ type formulaArg struct {
 // formulaFuncs is the type of the formula functions.
 type formulaFuncs struct{}
 
+// tokenPriority defined basic arithmetic operator priority.
+var tokenPriority = map[string]int{
+	"^":  5,
+	"*":  4,
+	"/":  4,
+	"+":  3,
+	"-":  3,
+	"=":  2,
+	"<":  2,
+	"<=": 2,
+	">":  2,
+	">=": 2,
+	"&":  1,
+}
+
 // CalcCellValue provides a function to get calculated cell value. This
 // feature is currently in working processing. Array formula, table formula
 // and some other formulas are not supported currently.
 //
 // Supported formulas:
 //
-//    ABS, ACOS, ACOSH, ACOT, ACOTH, ARABIC, ASIN, ASINH, ATAN2, ATANH, BASE,
-//    CEILING, CEILING.MATH, CEILING.PRECISE, COMBIN, COMBINA, COS, COSH, COT,
-//    COTH, COUNTA, CSC, CSCH, DECIMAL, DEGREES, EVEN, EXP, FACT, FACTDOUBLE,
-//    FLOOR, FLOOR.MATH, FLOOR.PRECISE, GCD, INT, ISBLANK, ISERR, ISERROR,
-//    ISEVEN, ISNA, ISNONTEXT, ISNUMBER, ISO.CEILING, ISODD, LCM, LN, LOG,
-//    LOG10, MDETERM, MEDIAN, MOD, MROUND, MULTINOMIAL, MUNIT, NA, ODD, PI,
-//    POWER, PRODUCT, QUOTIENT, RADIANS, RAND, RANDBETWEEN, ROUND, ROUNDDOWN,
-//    ROUNDUP, SEC, SECH, SIGN, SIN, SINH, SQRT, SQRTPI, SUM, SUMIF, SUMSQ,
-//    TAN, TANH, TRUNC
+//    ABS, ACOS, ACOSH, ACOT, ACOTH, AND, ARABIC, ASIN, ASINH, ATAN2, ATANH,
+//    BASE, CEILING, CEILING.MATH, CEILING.PRECISE, COMBIN, COMBINA, COS,
+//    COSH, COT, COTH, COUNTA, CSC, CSCH, DECIMAL, DEGREES, EVEN, EXP, FACT,
+//    FACTDOUBLE, FLOOR, FLOOR.MATH, FLOOR.PRECISE, GCD, INT, ISBLANK, ISERR,
+//    ISERROR, ISEVEN, ISNA, ISNONTEXT, ISNUMBER, ISO.CEILING, ISODD, LCM,
+//    LN, LOG, LOG10, MDETERM, MEDIAN, MOD, MROUND, MULTINOMIAL, MUNIT, NA,
+//    ODD, OR, PI, POWER, PRODUCT, QUOTIENT, RADIANS, RAND, RANDBETWEEN,
+//    ROUND, ROUNDDOWN, ROUNDUP, SEC, SECH, SIGN, SIN, SINH, SQRT, SQRTPI,
+//    SUM, SUMIF, SUMSQ, TAN, TANH, TRUNC
 //
 func (f *File) CalcCellValue(sheet, cell string) (result string, err error) {
 	var (
@@ -131,15 +146,9 @@ func (f *File) CalcCellValue(sheet, cell string) (result string, err error) {
 
 // getPriority calculate arithmetic operator priority.
 func getPriority(token efp.Token) (pri int) {
-	var priority = map[string]int{
-		"*": 2,
-		"/": 2,
-		"+": 1,
-		"-": 1,
-	}
-	pri, _ = priority[token.TValue]
+	pri, _ = tokenPriority[token.TValue]
 	if token.TValue == "-" && token.TType == efp.TokenTypeOperatorPrefix {
-		pri = 3
+		pri = 6
 	}
 	if token.TSubType == efp.TokenSubTypeStart && token.TType == efp.TokenTypeSubexpression { // (
 		pri = 0
@@ -306,18 +315,96 @@ func (f *File) evalInfixExp(sheet string, tokens []efp.Token) (efp.Token, error)
 	return opdStack.Peek().(efp.Token), err
 }
 
-// calcAdd evaluate addition arithmetic operations.
-func calcAdd(opdStack *Stack) error {
-	if opdStack.Len() < 2 {
-		return errors.New("formula not valid")
+// calcPow evaluate exponentiation arithmetic operations.
+func calcPow(rOpd, lOpd string, opdStack *Stack) error {
+	lOpdVal, err := strconv.ParseFloat(lOpd, 64)
+	if err != nil {
+		return err
+	}
+	rOpdVal, err := strconv.ParseFloat(rOpd, 64)
+	if err != nil {
+		return err
+	}
+	result := math.Pow(lOpdVal, rOpdVal)
+	opdStack.Push(efp.Token{TValue: fmt.Sprintf("%g", result), TType: efp.TokenTypeOperand, TSubType: efp.TokenSubTypeNumber})
+	return nil
+}
+
+// calcEq evaluate equal arithmetic operations.
+func calcEq(rOpd, lOpd string, opdStack *Stack) error {
+	opdStack.Push(efp.Token{TValue: strings.ToUpper(strconv.FormatBool(rOpd == lOpd)), TType: efp.TokenTypeOperand, TSubType: efp.TokenSubTypeNumber})
+	return nil
+}
+
+// calcL evaluate less than arithmetic operations.
+func calcL(rOpd, lOpd string, opdStack *Stack) error {
+	lOpdVal, err := strconv.ParseFloat(lOpd, 64)
+	if err != nil {
+		return err
+	}
+	rOpdVal, err := strconv.ParseFloat(rOpd, 64)
+	if err != nil {
+		return err
+	}
+	opdStack.Push(efp.Token{TValue: strings.ToUpper(strconv.FormatBool(rOpdVal > lOpdVal)), TType: efp.TokenTypeOperand, TSubType: efp.TokenSubTypeNumber})
+	return nil
+}
+
+// calcLe evaluate less than or equal arithmetic operations.
+func calcLe(rOpd, lOpd string, opdStack *Stack) error {
+	lOpdVal, err := strconv.ParseFloat(lOpd, 64)
+	if err != nil {
+		return err
+	}
+	rOpdVal, err := strconv.ParseFloat(rOpd, 64)
+	if err != nil {
+		return err
 	}
-	rOpd := opdStack.Pop().(efp.Token)
-	lOpd := opdStack.Pop().(efp.Token)
-	lOpdVal, err := strconv.ParseFloat(lOpd.TValue, 64)
+	opdStack.Push(efp.Token{TValue: strings.ToUpper(strconv.FormatBool(rOpdVal >= lOpdVal)), TType: efp.TokenTypeOperand, TSubType: efp.TokenSubTypeNumber})
+	return nil
+}
+
+// calcG evaluate greater than or equal arithmetic operations.
+func calcG(rOpd, lOpd string, opdStack *Stack) error {
+	lOpdVal, err := strconv.ParseFloat(lOpd, 64)
+	if err != nil {
+		return err
+	}
+	rOpdVal, err := strconv.ParseFloat(rOpd, 64)
+	if err != nil {
+		return err
+	}
+	opdStack.Push(efp.Token{TValue: strings.ToUpper(strconv.FormatBool(rOpdVal < lOpdVal)), TType: efp.TokenTypeOperand, TSubType: efp.TokenSubTypeNumber})
+	return nil
+}
+
+// calcGe evaluate greater than or equal arithmetic operations.
+func calcGe(rOpd, lOpd string, opdStack *Stack) error {
+	lOpdVal, err := strconv.ParseFloat(lOpd, 64)
 	if err != nil {
 		return err
 	}
-	rOpdVal, err := strconv.ParseFloat(rOpd.TValue, 64)
+	rOpdVal, err := strconv.ParseFloat(rOpd, 64)
+	if err != nil {
+		return err
+	}
+	opdStack.Push(efp.Token{TValue: strings.ToUpper(strconv.FormatBool(rOpdVal <= lOpdVal)), TType: efp.TokenTypeOperand, TSubType: efp.TokenSubTypeNumber})
+	return nil
+}
+
+// calcSplice evaluate splice '&' operations.
+func calcSplice(rOpd, lOpd string, opdStack *Stack) error {
+	opdStack.Push(efp.Token{TValue: lOpd + rOpd, TType: efp.TokenTypeOperand, TSubType: efp.TokenSubTypeNumber})
+	return nil
+}
+
+// calcAdd evaluate addition arithmetic operations.
+func calcAdd(rOpd, lOpd string, opdStack *Stack) error {
+	lOpdVal, err := strconv.ParseFloat(lOpd, 64)
+	if err != nil {
+		return err
+	}
+	rOpdVal, err := strconv.ParseFloat(rOpd, 64)
 	if err != nil {
 		return err
 	}
@@ -327,17 +414,12 @@ func calcAdd(opdStack *Stack) error {
 }
 
 // calcSubtract evaluate subtraction arithmetic operations.
-func calcSubtract(opdStack *Stack) error {
-	if opdStack.Len() < 2 {
-		return errors.New("formula not valid")
-	}
-	rOpd := opdStack.Pop().(efp.Token)
-	lOpd := opdStack.Pop().(efp.Token)
-	lOpdVal, err := strconv.ParseFloat(lOpd.TValue, 64)
+func calcSubtract(rOpd, lOpd string, opdStack *Stack) error {
+	lOpdVal, err := strconv.ParseFloat(lOpd, 64)
 	if err != nil {
 		return err
 	}
-	rOpdVal, err := strconv.ParseFloat(rOpd.TValue, 64)
+	rOpdVal, err := strconv.ParseFloat(rOpd, 64)
 	if err != nil {
 		return err
 	}
@@ -347,17 +429,12 @@ func calcSubtract(opdStack *Stack) error {
 }
 
 // calcMultiply evaluate multiplication arithmetic operations.
-func calcMultiply(opdStack *Stack) error {
-	if opdStack.Len() < 2 {
-		return errors.New("formula not valid")
-	}
-	rOpd := opdStack.Pop().(efp.Token)
-	lOpd := opdStack.Pop().(efp.Token)
-	lOpdVal, err := strconv.ParseFloat(lOpd.TValue, 64)
+func calcMultiply(rOpd, lOpd string, opdStack *Stack) error {
+	lOpdVal, err := strconv.ParseFloat(lOpd, 64)
 	if err != nil {
 		return err
 	}
-	rOpdVal, err := strconv.ParseFloat(rOpd.TValue, 64)
+	rOpdVal, err := strconv.ParseFloat(rOpd, 64)
 	if err != nil {
 		return err
 	}
@@ -366,18 +443,13 @@ func calcMultiply(opdStack *Stack) error {
 	return nil
 }
 
-// calcDivide evaluate division arithmetic operations.
-func calcDivide(opdStack *Stack) error {
-	if opdStack.Len() < 2 {
-		return errors.New("formula not valid")
-	}
-	rOpd := opdStack.Pop().(efp.Token)
-	lOpd := opdStack.Pop().(efp.Token)
-	lOpdVal, err := strconv.ParseFloat(lOpd.TValue, 64)
+// calcDiv evaluate division arithmetic operations.
+func calcDiv(rOpd, lOpd string, opdStack *Stack) error {
+	lOpdVal, err := strconv.ParseFloat(lOpd, 64)
 	if err != nil {
 		return err
 	}
-	rOpdVal, err := strconv.ParseFloat(rOpd.TValue, 64)
+	rOpdVal, err := strconv.ParseFloat(rOpd, 64)
 	if err != nil {
 		return err
 	}
@@ -403,24 +475,36 @@ func calculate(opdStack *Stack, opt efp.Token) error {
 		result := 0 - opdVal
 		opdStack.Push(efp.Token{TValue: fmt.Sprintf("%g", result), TType: efp.TokenTypeOperand, TSubType: efp.TokenSubTypeNumber})
 	}
-
-	if opt.TValue == "+" {
-		if err := calcAdd(opdStack); err != nil {
-			return err
-		}
+	tokenCalcFunc := map[string]func(rOpd, lOpd string, opdStack *Stack) error{
+		"^":  calcPow,
+		"*":  calcMultiply,
+		"/":  calcDiv,
+		"+":  calcAdd,
+		"=":  calcEq,
+		"<":  calcL,
+		"<=": calcLe,
+		">":  calcG,
+		">=": calcGe,
+		"&":  calcSplice,
 	}
 	if opt.TValue == "-" && opt.TType == efp.TokenTypeOperatorInfix {
-		if err := calcSubtract(opdStack); err != nil {
-			return err
+		if opdStack.Len() < 2 {
+			return errors.New("formula not valid")
 		}
-	}
-	if opt.TValue == "*" {
-		if err := calcMultiply(opdStack); err != nil {
+		rOpd := opdStack.Pop().(efp.Token)
+		lOpd := opdStack.Pop().(efp.Token)
+		if err := calcSubtract(rOpd.TValue, lOpd.TValue, opdStack); err != nil {
 			return err
 		}
 	}
-	if opt.TValue == "/" {
-		if err := calcDivide(opdStack); err != nil {
+	fn, ok := tokenCalcFunc[opt.TValue]
+	if ok {
+		if opdStack.Len() < 2 {
+			return errors.New("formula not valid")
+		}
+		rOpd := opdStack.Pop().(efp.Token)
+		lOpd := opdStack.Pop().(efp.Token)
+		if err := fn(rOpd.TValue, lOpd.TValue, opdStack); err != nil {
 			return err
 		}
 	}
@@ -459,8 +543,8 @@ func (f *File) parseOperatorPrefixToken(optStack, opdStack *Stack, token efp.Tok
 // isOperatorPrefixToken determine if the token is parse operator prefix
 // token.
 func isOperatorPrefixToken(token efp.Token) bool {
-	if (token.TValue == "-" && token.TType == efp.TokenTypeOperatorPrefix) ||
-		token.TValue == "+" || token.TValue == "-" || token.TValue == "*" || token.TValue == "/" {
+	_, ok := tokenPriority[token.TValue]
+	if (token.TValue == "-" && token.TType == efp.TokenTypeOperatorPrefix) || ok {
 		return true
 	}
 	return false
@@ -3140,3 +3224,87 @@ func (fn *formulaFuncs) NA(argsList *list.List) (result string, err error) {
 	result = formulaErrorNA
 	return
 }
+
+// Logical Functions
+
+// AND function tests a number of supplied conditions and returns TRUE or
+// FALSE.
+func (fn *formulaFuncs) AND(argsList *list.List) (result string, err error) {
+	if argsList.Len() == 0 {
+		err = errors.New("AND requires at least 1 argument")
+		return
+	}
+	if argsList.Len() > 30 {
+		err = errors.New("AND accepts at most 30 arguments")
+		return
+	}
+	var and = true
+	var val float64
+	for arg := argsList.Front(); arg != nil; arg = arg.Next() {
+		token := arg.Value.(formulaArg)
+		switch token.Type {
+		case ArgUnknown:
+			continue
+		case ArgString:
+			if token.String == "TRUE" {
+				continue
+			}
+			if token.String == "FALSE" {
+				result = token.String
+				return
+			}
+			if val, err = strconv.ParseFloat(token.String, 64); err != nil {
+				err = errors.New(formulaErrorVALUE)
+				return
+			}
+			and = and && (val != 0)
+		case ArgMatrix:
+			// TODO
+			err = errors.New(formulaErrorVALUE)
+			return
+		}
+	}
+	result = strings.ToUpper(strconv.FormatBool(and))
+	return
+}
+
+// OR function tests a number of supplied conditions and returns either TRUE
+// or FALSE.
+func (fn *formulaFuncs) OR(argsList *list.List) (result string, err error) {
+	if argsList.Len() == 0 {
+		err = errors.New("OR requires at least 1 argument")
+		return
+	}
+	if argsList.Len() > 30 {
+		err = errors.New("OR accepts at most 30 arguments")
+		return
+	}
+	var or bool
+	var val float64
+	for arg := argsList.Front(); arg != nil; arg = arg.Next() {
+		token := arg.Value.(formulaArg)
+		switch token.Type {
+		case ArgUnknown:
+			continue
+		case ArgString:
+			if token.String == "FALSE" {
+				continue
+			}
+			if token.String == "TRUE" {
+				or = true
+				continue
+			}
+			if val, err = strconv.ParseFloat(token.String, 64); err != nil {
+				err = errors.New(formulaErrorVALUE)
+				return
+			}
+			or = val != 0
+		case ArgMatrix:
+			// TODO
+			err = errors.New(formulaErrorVALUE)
+			return
+		}
+	}
+	result = strings.ToUpper(strconv.FormatBool(or))
+	return
+}
diff --git a/calc_test.go b/calc_test.go
index 7d7b886..02b5161 100644
--- a/calc_test.go
+++ b/calc_test.go
@@ -1,7 +1,9 @@
 package excelize
 
 import (
+	"container/list"
 	"path/filepath"
+	"strings"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
@@ -31,6 +33,18 @@ func TestCalcCellValue(t *testing.T) {
 	}
 
 	mathCalc := map[string]string{
+		"=2^3":  "8",
+		"=1=1":  "TRUE",
+		"=1=2":  "FALSE",
+		"=1<2":  "TRUE",
+		"=3<2":  "FALSE",
+		"=2<=3": "TRUE",
+		"=2<=1": "FALSE",
+		"=2>1":  "TRUE",
+		"=2>3":  "FALSE",
+		"=2>=1": "TRUE",
+		"=2>=3": "FALSE",
+		"=1&2":  "12",
 		// ABS
 		"=ABS(-1)":    "1",
 		"=ABS(-6.5)":  "6.5",
@@ -429,6 +443,20 @@ func TestCalcCellValue(t *testing.T) {
 		"=ISODD(A2)": "FALSE",
 		// NA
 		"=NA()": "#N/A",
+		// AND
+		"=AND(0)":               "FALSE",
+		"=AND(1)":               "TRUE",
+		"=AND(1,0)":             "FALSE",
+		"=AND(0,1)":             "FALSE",
+		"=AND(1=1)":             "TRUE",
+		"=AND(1<2)":             "TRUE",
+		"=AND(1>2,2<3,2>0,3>1)": "FALSE",
+		"=AND(1=1),1=1":         "TRUE",
+		// OR
+		"=OR(1)":       "TRUE",
+		"=OR(0)":       "FALSE",
+		"=OR(1=2,2=2)": "TRUE",
+		"=OR(1=2,2=3)": "FALSE",
 	}
 	for formula, expected := range mathCalc {
 		f := prepareData()
@@ -728,6 +756,16 @@ func TestCalcCellValue(t *testing.T) {
 		`=ISODD("text")`: "#VALUE!",
 		// NA
 		"=NA(1)": "NA accepts no arguments",
+		// AND
+		`=AND("text")`: "#VALUE!",
+		`=AND(A1:B1)`:  "#VALUE!",
+		"=AND()":       "AND requires at least 1 argument",
+		"=AND(1" + strings.Repeat(",1", 30) + ")": "AND accepts at most 30 arguments",
+		// OR
+		`=OR("text")`:                            "#VALUE!",
+		`=OR(A1:B1)`:                             "#VALUE!",
+		"=OR()":                                  "OR requires at least 1 argument",
+		"=OR(1" + strings.Repeat(",1", 30) + ")": "OR accepts at most 30 arguments",
 	}
 	for formula, expected := range mathCalcError {
 		f := prepareData()
@@ -829,6 +867,63 @@ func TestCalcCellValueWithDefinedName(t *testing.T) {
 	assert.Equal(t, "B1 value", result, "=defined_name1")
 }
 
+func TestCalcPow(t *testing.T) {
+	err := `strconv.ParseFloat: parsing "text": invalid syntax`
+	assert.EqualError(t, calcPow("1", "text", nil), err)
+	assert.EqualError(t, calcPow("text", "1", nil), err)
+	assert.EqualError(t, calcL("1", "text", nil), err)
+	assert.EqualError(t, calcL("text", "1", nil), err)
+	assert.EqualError(t, calcLe("1", "text", nil), err)
+	assert.EqualError(t, calcLe("text", "1", nil), err)
+	assert.EqualError(t, calcG("1", "text", nil), err)
+	assert.EqualError(t, calcG("text", "1", nil), err)
+	assert.EqualError(t, calcGe("1", "text", nil), err)
+	assert.EqualError(t, calcGe("text", "1", nil), err)
+	assert.EqualError(t, calcAdd("1", "text", nil), err)
+	assert.EqualError(t, calcAdd("text", "1", nil), err)
+	assert.EqualError(t, calcAdd("1", "text", nil), err)
+	assert.EqualError(t, calcAdd("text", "1", nil), err)
+	assert.EqualError(t, calcSubtract("1", "text", nil), err)
+	assert.EqualError(t, calcSubtract("text", "1", nil), err)
+	assert.EqualError(t, calcMultiply("1", "text", nil), err)
+	assert.EqualError(t, calcMultiply("text", "1", nil), err)
+	assert.EqualError(t, calcDiv("1", "text", nil), err)
+	assert.EqualError(t, calcDiv("text", "1", nil), err)
+}
+
+func TestISBLANK(t *testing.T) {
+	argsList := list.New()
+	argsList.PushBack(formulaArg{
+		Type: ArgUnknown,
+	})
+	fn := formulaFuncs{}
+	result, err := fn.ISBLANK(argsList)
+	assert.Equal(t, result, "TRUE")
+	assert.NoError(t, err)
+}
+
+func TestAND(t *testing.T) {
+	argsList := list.New()
+	argsList.PushBack(formulaArg{
+		Type: ArgUnknown,
+	})
+	fn := formulaFuncs{}
+	result, err := fn.AND(argsList)
+	assert.Equal(t, result, "TRUE")
+	assert.NoError(t, err)
+}
+
+func TestOR(t *testing.T) {
+	argsList := list.New()
+	argsList.PushBack(formulaArg{
+		Type: ArgUnknown,
+	})
+	fn := formulaFuncs{}
+	result, err := fn.OR(argsList)
+	assert.Equal(t, result, "FALSE")
+	assert.NoError(t, err)
+}
+
 func TestDet(t *testing.T) {
 	assert.Equal(t, det([][]float64{
 		{1, 2, 3, 4},
diff --git a/go.mod b/go.mod
index 4b6e778..773f0a3 100644
--- a/go.mod
+++ b/go.mod
@@ -5,10 +5,8 @@ go 1.11
 require (
 	github.com/mohae/deepcopy v0.0.0-20170929034955-c48cc78d4826
 	github.com/richardlehane/mscfb v1.0.3
-	github.com/stretchr/testify v1.6.1
-	github.com/xuri/efp v0.0.0-20200605144744-ba689101faaf
-	golang.org/x/crypto v0.0.0-20200820211705-5c72a883971a
-	golang.org/x/image v0.0.0-20200922025426-e59bae62ef32
-	golang.org/x/net v0.0.0-20200904194848-62affa334b73
+	github.com/xuri/efp v0.0.0-20201016154823-031c29024257
+	golang.org/x/crypto v0.0.0-20201012173705-84dcc777aaee
+	golang.org/x/net v0.0.0-20201016165138-7b1cca2348c0
 	golang.org/x/text v0.3.3
 )
diff --git a/go.sum b/go.sum
index e082e86..17e16a5 100644
--- a/go.sum
+++ b/go.sum
@@ -1,35 +1,22 @@
-github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
-github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/mohae/deepcopy v0.0.0-20170929034955-c48cc78d4826 h1:RWengNIwukTxcDr9M+97sNutRR1RKhG96O6jWumTTnw=
 github.com/mohae/deepcopy v0.0.0-20170929034955-c48cc78d4826/go.mod h1:TaXosZuwdSHYgviHp1DAtfrULt5eUgsSMsZf+YrPgl8=
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