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	Use a general Eval function for expressions in templates. (#23927)
One of the proposals in #23328 This PR introduces a simple expression calculator (templates/eval/eval.go), it can do basic expression calculations. Many untested template helper functions like `Mul` `Add` can be replaced by this new approach. Then these `Add` / `Mul` / `percentage` / `Subtract` / `DiffStatsWidth` could all use this `Eval`. And it provides enhancements for Golang templates, and improves readability. Some examples: ---- * Before: `{{Add (Mul $glyph.Row 12) 12}}` * After: `{{Eval $glyph.Row "*" 12 "+" 12}}` ---- * Before: `{{if lt (Add $i 1) (len $.Topics)}}` * After: `{{if Eval $i "+" 1 "<" (len $.Topics)}}` ## FAQ ### Why not use an existing expression package? We need a highly customized expression engine: * do the calculation on the fly, without pre-compiling * deal with int/int64/float64 types, to make the result could be used in Golang template. * make the syntax could be used in the Golang template directly * do not introduce too much complex or strange syntax, we just need a simple calculator. * it needs to strictly follow Golang template's behavior, for example, Golang template treats all non-zero values as truth, but many 3rd packages don't do so. ### What's the benefit? * Developers don't need to add more `Add`/`Mul`/`Sub`-like functions, they were getting more and more. Now, only one `Eval` is enough for all cases. * The new code reads better than old `{{Add (Mul $glyph.Row 12) 12}}`, the old one isn't familiar to most procedural programming developers (eg, the Golang expression syntax). * The `Eval` is fully covered by tests, many old `Add`/`Mul`-like functions were never tested. ### The performance? It doesn't use `reflect`, it doesn't need to parse or compile when used in Golang template, the performance is as fast as native Go template. ### Is it too complex? Could it be unstable? The expression calculator program is a common homework for computer science students, and it's widely used as a teaching and practicing purpose for developers. The algorithm is pretty well-known. The behavior can be clearly defined, it is stable.
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					 15 changed files with 529 additions and 157 deletions
				
			
		|  | @ -141,55 +141,6 @@ func FileSize(s int64) string { | |||
| 	return humanize.IBytes(uint64(s)) | ||||
| } | ||||
| 
 | ||||
| // Subtract deals with subtraction of all types of number. | ||||
| func Subtract(left, right interface{}) interface{} { | ||||
| 	var rleft, rright int64 | ||||
| 	var fleft, fright float64 | ||||
| 	isInt := true | ||||
| 	switch v := left.(type) { | ||||
| 	case int: | ||||
| 		rleft = int64(v) | ||||
| 	case int8: | ||||
| 		rleft = int64(v) | ||||
| 	case int16: | ||||
| 		rleft = int64(v) | ||||
| 	case int32: | ||||
| 		rleft = int64(v) | ||||
| 	case int64: | ||||
| 		rleft = v | ||||
| 	case float32: | ||||
| 		fleft = float64(v) | ||||
| 		isInt = false | ||||
| 	case float64: | ||||
| 		fleft = v | ||||
| 		isInt = false | ||||
| 	} | ||||
| 
 | ||||
| 	switch v := right.(type) { | ||||
| 	case int: | ||||
| 		rright = int64(v) | ||||
| 	case int8: | ||||
| 		rright = int64(v) | ||||
| 	case int16: | ||||
| 		rright = int64(v) | ||||
| 	case int32: | ||||
| 		rright = int64(v) | ||||
| 	case int64: | ||||
| 		rright = v | ||||
| 	case float32: | ||||
| 		fright = float64(v) | ||||
| 		isInt = false | ||||
| 	case float64: | ||||
| 		fright = v | ||||
| 		isInt = false | ||||
| 	} | ||||
| 
 | ||||
| 	if isInt { | ||||
| 		return rleft - rright | ||||
| 	} | ||||
| 	return fleft + float64(rleft) - (fright + float64(rright)) | ||||
| } | ||||
| 
 | ||||
| // EllipsisString returns a truncated short string, | ||||
| // it appends '...' in the end of the length of string is too large. | ||||
| func EllipsisString(str string, length int) string { | ||||
|  |  | |||
|  | @ -114,45 +114,6 @@ func TestFileSize(t *testing.T) { | |||
| 	assert.Equal(t, "2.0 EiB", FileSize(size)) | ||||
| } | ||||
| 
 | ||||
| func TestSubtract(t *testing.T) { | ||||
| 	toFloat64 := func(n interface{}) float64 { | ||||
| 		switch v := n.(type) { | ||||
| 		case int: | ||||
| 			return float64(v) | ||||
| 		case int8: | ||||
| 			return float64(v) | ||||
| 		case int16: | ||||
| 			return float64(v) | ||||
| 		case int32: | ||||
| 			return float64(v) | ||||
| 		case int64: | ||||
| 			return float64(v) | ||||
| 		case float32: | ||||
| 			return float64(v) | ||||
| 		case float64: | ||||
| 			return v | ||||
| 		default: | ||||
| 			return 0.0 | ||||
| 		} | ||||
| 	} | ||||
| 	values := []interface{}{ | ||||
| 		int(-3), | ||||
| 		int8(14), | ||||
| 		int16(81), | ||||
| 		int32(-156), | ||||
| 		int64(1528), | ||||
| 		float32(3.5), | ||||
| 		float64(-15.348), | ||||
| 	} | ||||
| 	for _, left := range values { | ||||
| 		for _, right := range values { | ||||
| 			expected := toFloat64(left) - toFloat64(right) | ||||
| 			sub := Subtract(left, right) | ||||
| 			assert.InDelta(t, expected, sub, 1e-3) | ||||
| 		} | ||||
| 	} | ||||
| } | ||||
| 
 | ||||
| func TestEllipsisString(t *testing.T) { | ||||
| 	assert.Equal(t, "...", EllipsisString("foobar", 0)) | ||||
| 	assert.Equal(t, "...", EllipsisString("foobar", 1)) | ||||
|  |  | |||
							
								
								
									
										344
									
								
								modules/templates/eval/eval.go
									
										
									
									
									
										Normal file
									
								
							
							
						
						
									
										344
									
								
								modules/templates/eval/eval.go
									
										
									
									
									
										Normal file
									
								
							|  | @ -0,0 +1,344 @@ | |||
| // Copyright 2023 The Gitea Authors. All rights reserved. | ||||
| // SPDX-License-Identifier: MIT | ||||
| 
 | ||||
| package eval | ||||
| 
 | ||||
| import ( | ||||
| 	"fmt" | ||||
| 	"strconv" | ||||
| 	"strings" | ||||
| 
 | ||||
| 	"code.gitea.io/gitea/modules/util" | ||||
| ) | ||||
| 
 | ||||
| type Num struct { | ||||
| 	Value any // int64 or float64, nil on error | ||||
| } | ||||
| 
 | ||||
| var opPrecedence = map[string]int{ | ||||
| 	// "(": 1, this is for low precedence like function calls, they are handled separately | ||||
| 	"or":  2, | ||||
| 	"and": 3, | ||||
| 	"not": 4, | ||||
| 	"==":  5, "!=": 5, "<": 5, "<=": 5, ">": 5, ">=": 5, | ||||
| 	"+": 6, "-": 6, | ||||
| 	"*": 7, "/": 7, | ||||
| } | ||||
| 
 | ||||
| type stack[T any] struct { | ||||
| 	name  string | ||||
| 	elems []T | ||||
| } | ||||
| 
 | ||||
| func (s *stack[T]) push(t T) { | ||||
| 	s.elems = append(s.elems, t) | ||||
| } | ||||
| 
 | ||||
| func (s *stack[T]) pop() T { | ||||
| 	if len(s.elems) == 0 { | ||||
| 		panic(s.name + " stack is empty") | ||||
| 	} | ||||
| 	t := s.elems[len(s.elems)-1] | ||||
| 	s.elems = s.elems[:len(s.elems)-1] | ||||
| 	return t | ||||
| } | ||||
| 
 | ||||
| func (s *stack[T]) peek() T { | ||||
| 	if len(s.elems) == 0 { | ||||
| 		panic(s.name + " stack is empty") | ||||
| 	} | ||||
| 	return s.elems[len(s.elems)-1] | ||||
| } | ||||
| 
 | ||||
| type operator string | ||||
| 
 | ||||
| type eval struct { | ||||
| 	stackNum stack[Num] | ||||
| 	stackOp  stack[operator] | ||||
| 	funcMap  map[string]func([]Num) Num | ||||
| } | ||||
| 
 | ||||
| func newEval() *eval { | ||||
| 	e := &eval{} | ||||
| 	e.stackNum.name = "num" | ||||
| 	e.stackOp.name = "op" | ||||
| 	return e | ||||
| } | ||||
| 
 | ||||
| func toNum(v any) (Num, error) { | ||||
| 	switch v := v.(type) { | ||||
| 	case string: | ||||
| 		if strings.Contains(v, ".") { | ||||
| 			n, err := strconv.ParseFloat(v, 64) | ||||
| 			if err != nil { | ||||
| 				return Num{n}, err | ||||
| 			} | ||||
| 			return Num{n}, nil | ||||
| 		} | ||||
| 		n, err := strconv.ParseInt(v, 10, 64) | ||||
| 		if err != nil { | ||||
| 			return Num{n}, err | ||||
| 		} | ||||
| 		return Num{n}, nil | ||||
| 	case float32, float64: | ||||
| 		n, _ := util.ToFloat64(v) | ||||
| 		return Num{n}, nil | ||||
| 	default: | ||||
| 		n, err := util.ToInt64(v) | ||||
| 		if err != nil { | ||||
| 			return Num{n}, err | ||||
| 		} | ||||
| 		return Num{n}, nil | ||||
| 	} | ||||
| } | ||||
| 
 | ||||
| func truth(b bool) int64 { | ||||
| 	if b { | ||||
| 		return int64(1) | ||||
| 	} | ||||
| 	return int64(0) | ||||
| } | ||||
| 
 | ||||
| func applyOp2Generic[T int64 | float64](op operator, n1, n2 T) Num { | ||||
| 	switch op { | ||||
| 	case "+": | ||||
| 		return Num{n1 + n2} | ||||
| 	case "-": | ||||
| 		return Num{n1 - n2} | ||||
| 	case "*": | ||||
| 		return Num{n1 * n2} | ||||
| 	case "/": | ||||
| 		return Num{n1 / n2} | ||||
| 	case "==": | ||||
| 		return Num{truth(n1 == n2)} | ||||
| 	case "!=": | ||||
| 		return Num{truth(n1 != n2)} | ||||
| 	case "<": | ||||
| 		return Num{truth(n1 < n2)} | ||||
| 	case "<=": | ||||
| 		return Num{truth(n1 <= n2)} | ||||
| 	case ">": | ||||
| 		return Num{truth(n1 > n2)} | ||||
| 	case ">=": | ||||
| 		return Num{truth(n1 >= n2)} | ||||
| 	case "and": | ||||
| 		t1, _ := util.ToFloat64(n1) | ||||
| 		t2, _ := util.ToFloat64(n2) | ||||
| 		return Num{truth(t1 != 0 && t2 != 0)} | ||||
| 	case "or": | ||||
| 		t1, _ := util.ToFloat64(n1) | ||||
| 		t2, _ := util.ToFloat64(n2) | ||||
| 		return Num{truth(t1 != 0 || t2 != 0)} | ||||
| 	} | ||||
| 	panic("unknown operator: " + string(op)) | ||||
| } | ||||
| 
 | ||||
| func applyOp2(op operator, n1, n2 Num) Num { | ||||
| 	float := false | ||||
| 	if _, ok := n1.Value.(float64); ok { | ||||
| 		float = true | ||||
| 	} else if _, ok = n2.Value.(float64); ok { | ||||
| 		float = true | ||||
| 	} | ||||
| 	if float { | ||||
| 		f1, _ := util.ToFloat64(n1.Value) | ||||
| 		f2, _ := util.ToFloat64(n2.Value) | ||||
| 		return applyOp2Generic(op, f1, f2) | ||||
| 	} | ||||
| 	return applyOp2Generic(op, n1.Value.(int64), n2.Value.(int64)) | ||||
| } | ||||
| 
 | ||||
| func toOp(v any) (operator, error) { | ||||
| 	if v, ok := v.(string); ok { | ||||
| 		return operator(v), nil | ||||
| 	} | ||||
| 	return "", fmt.Errorf(`unsupported token type "%T"`, v) | ||||
| } | ||||
| 
 | ||||
| func (op operator) hasOpenBracket() bool { | ||||
| 	return strings.HasSuffix(string(op), "(") // it's used to support functions like "sum(" | ||||
| } | ||||
| 
 | ||||
| func (op operator) isComma() bool { | ||||
| 	return op == "," | ||||
| } | ||||
| 
 | ||||
| func (op operator) isCloseBracket() bool { | ||||
| 	return op == ")" | ||||
| } | ||||
| 
 | ||||
| type ExprError struct { | ||||
| 	msg    string | ||||
| 	tokens []any | ||||
| 	err    error | ||||
| } | ||||
| 
 | ||||
| func (err ExprError) Error() string { | ||||
| 	sb := strings.Builder{} | ||||
| 	sb.WriteString(err.msg) | ||||
| 	sb.WriteString(" [ ") | ||||
| 	for _, token := range err.tokens { | ||||
| 		_, _ = fmt.Fprintf(&sb, `"%v" `, token) | ||||
| 	} | ||||
| 	sb.WriteString("]") | ||||
| 	if err.err != nil { | ||||
| 		sb.WriteString(": ") | ||||
| 		sb.WriteString(err.err.Error()) | ||||
| 	} | ||||
| 	return sb.String() | ||||
| } | ||||
| 
 | ||||
| func (err ExprError) Unwrap() error { | ||||
| 	return err.err | ||||
| } | ||||
| 
 | ||||
| func (e *eval) applyOp() { | ||||
| 	op := e.stackOp.pop() | ||||
| 	if op == "not" { | ||||
| 		num := e.stackNum.pop() | ||||
| 		i, _ := util.ToInt64(num.Value) | ||||
| 		e.stackNum.push(Num{truth(i == 0)}) | ||||
| 	} else if op.hasOpenBracket() || op.isCloseBracket() || op.isComma() { | ||||
| 		panic(fmt.Sprintf("incomplete sub-expression with operator %q", op)) | ||||
| 	} else { | ||||
| 		num2 := e.stackNum.pop() | ||||
| 		num1 := e.stackNum.pop() | ||||
| 		e.stackNum.push(applyOp2(op, num1, num2)) | ||||
| 	} | ||||
| } | ||||
| 
 | ||||
| func (e *eval) exec(tokens ...any) (ret Num, err error) { | ||||
| 	defer func() { | ||||
| 		if r := recover(); r != nil { | ||||
| 			rErr, ok := r.(error) | ||||
| 			if !ok { | ||||
| 				rErr = fmt.Errorf("%v", r) | ||||
| 			} | ||||
| 			err = ExprError{"invalid expression", tokens, rErr} | ||||
| 		} | ||||
| 	}() | ||||
| 	for _, token := range tokens { | ||||
| 		n, err := toNum(token) | ||||
| 		if err == nil { | ||||
| 			e.stackNum.push(n) | ||||
| 			continue | ||||
| 		} | ||||
| 
 | ||||
| 		op, err := toOp(token) | ||||
| 		if err != nil { | ||||
| 			return Num{}, ExprError{"invalid expression", tokens, err} | ||||
| 		} | ||||
| 
 | ||||
| 		switch { | ||||
| 		case op.hasOpenBracket(): | ||||
| 			e.stackOp.push(op) | ||||
| 		case op.isCloseBracket(), op.isComma(): | ||||
| 			var stackTopOp operator | ||||
| 			for len(e.stackOp.elems) > 0 { | ||||
| 				stackTopOp = e.stackOp.peek() | ||||
| 				if stackTopOp.hasOpenBracket() || stackTopOp.isComma() { | ||||
| 					break | ||||
| 				} | ||||
| 				e.applyOp() | ||||
| 			} | ||||
| 			if op.isCloseBracket() { | ||||
| 				nums := []Num{e.stackNum.pop()} | ||||
| 				for !e.stackOp.peek().hasOpenBracket() { | ||||
| 					stackTopOp = e.stackOp.pop() | ||||
| 					if !stackTopOp.isComma() { | ||||
| 						return Num{}, ExprError{"bracket doesn't match", tokens, nil} | ||||
| 					} | ||||
| 					nums = append(nums, e.stackNum.pop()) | ||||
| 				} | ||||
| 				for i, j := 0, len(nums)-1; i < j; i, j = i+1, j-1 { | ||||
| 					nums[i], nums[j] = nums[j], nums[i] // reverse nums slice, to get the right order for arguments | ||||
| 				} | ||||
| 				stackTopOp = e.stackOp.pop() | ||||
| 				fn := string(stackTopOp[:len(stackTopOp)-1]) | ||||
| 				if fn == "" { | ||||
| 					if len(nums) != 1 { | ||||
| 						return Num{}, ExprError{"too many values in one bracket", tokens, nil} | ||||
| 					} | ||||
| 					e.stackNum.push(nums[0]) | ||||
| 				} else if f, ok := e.funcMap[fn]; ok { | ||||
| 					e.stackNum.push(f(nums)) | ||||
| 				} else { | ||||
| 					return Num{}, ExprError{"unknown function: " + fn, tokens, nil} | ||||
| 				} | ||||
| 			} else { | ||||
| 				e.stackOp.push(op) | ||||
| 			} | ||||
| 		default: | ||||
| 			for len(e.stackOp.elems) > 0 && len(e.stackNum.elems) > 0 { | ||||
| 				stackTopOp := e.stackOp.peek() | ||||
| 				if stackTopOp.hasOpenBracket() || stackTopOp.isComma() || precedence(stackTopOp, op) < 0 { | ||||
| 					break | ||||
| 				} | ||||
| 				e.applyOp() | ||||
| 			} | ||||
| 			e.stackOp.push(op) | ||||
| 		} | ||||
| 	} | ||||
| 	for len(e.stackOp.elems) > 0 && !e.stackOp.peek().isComma() { | ||||
| 		e.applyOp() | ||||
| 	} | ||||
| 	if len(e.stackNum.elems) != 1 { | ||||
| 		return Num{}, ExprError{fmt.Sprintf("expect 1 value as final result, but there are %d", len(e.stackNum.elems)), tokens, nil} | ||||
| 	} | ||||
| 	return e.stackNum.pop(), nil | ||||
| } | ||||
| 
 | ||||
| func precedence(op1, op2 operator) int { | ||||
| 	p1 := opPrecedence[string(op1)] | ||||
| 	p2 := opPrecedence[string(op2)] | ||||
| 	if p1 == 0 { | ||||
| 		panic("unknown operator precedence: " + string(op1)) | ||||
| 	} else if p2 == 0 { | ||||
| 		panic("unknown operator precedence: " + string(op2)) | ||||
| 	} | ||||
| 	return p1 - p2 | ||||
| } | ||||
| 
 | ||||
| func castFloat64(nums []Num) bool { | ||||
| 	hasFloat := false | ||||
| 	for _, num := range nums { | ||||
| 		if _, hasFloat = num.Value.(float64); hasFloat { | ||||
| 			break | ||||
| 		} | ||||
| 	} | ||||
| 	if hasFloat { | ||||
| 		for i, num := range nums { | ||||
| 			if _, ok := num.Value.(float64); !ok { | ||||
| 				f, _ := util.ToFloat64(num.Value) | ||||
| 				nums[i] = Num{f} | ||||
| 			} | ||||
| 		} | ||||
| 	} | ||||
| 	return hasFloat | ||||
| } | ||||
| 
 | ||||
| func fnSum(nums []Num) Num { | ||||
| 	if castFloat64(nums) { | ||||
| 		var sum float64 | ||||
| 		for _, num := range nums { | ||||
| 			sum += num.Value.(float64) | ||||
| 		} | ||||
| 		return Num{sum} | ||||
| 	} | ||||
| 	var sum int64 | ||||
| 	for _, num := range nums { | ||||
| 		sum += num.Value.(int64) | ||||
| 	} | ||||
| 	return Num{sum} | ||||
| } | ||||
| 
 | ||||
| // Expr evaluates the given expression tokens and returns the result. | ||||
| // It supports the following operators: +, -, *, /, and, or, not, ==, !=, >, >=, <, <=. | ||||
| // Non-zero values are treated as true, zero values are treated as false. | ||||
| // If no error occurs, the result is either an int64 or a float64. | ||||
| // If all numbers are integer, the result is an int64, otherwise if there is any float number, the result is a float64. | ||||
| func Expr(tokens ...any) (Num, error) { | ||||
| 	e := newEval() | ||||
| 	e.funcMap = map[string]func([]Num) Num{"sum": fnSum} | ||||
| 	return e.exec(tokens...) | ||||
| } | ||||
							
								
								
									
										94
									
								
								modules/templates/eval/eval_test.go
									
										
									
									
									
										Normal file
									
								
							
							
						
						
									
										94
									
								
								modules/templates/eval/eval_test.go
									
										
									
									
									
										Normal file
									
								
							|  | @ -0,0 +1,94 @@ | |||
| // Copyright 2023 The Gitea Authors. All rights reserved. | ||||
| // SPDX-License-Identifier: MIT | ||||
| 
 | ||||
| package eval | ||||
| 
 | ||||
| import ( | ||||
| 	"math" | ||||
| 	"strings" | ||||
| 	"testing" | ||||
| 
 | ||||
| 	"github.com/stretchr/testify/assert" | ||||
| ) | ||||
| 
 | ||||
| func tokens(s string) (a []any) { | ||||
| 	for _, v := range strings.Fields(s) { | ||||
| 		a = append(a, v) | ||||
| 	} | ||||
| 	return a | ||||
| } | ||||
| 
 | ||||
| func TestEval(t *testing.T) { | ||||
| 	n, err := Expr(0, "/", 0.0) | ||||
| 	assert.NoError(t, err) | ||||
| 	assert.True(t, math.IsNaN(n.Value.(float64))) | ||||
| 
 | ||||
| 	_, err = Expr(nil) | ||||
| 	assert.ErrorContains(t, err, "unsupported token type") | ||||
| 	_, err = Expr([]string{}) | ||||
| 	assert.ErrorContains(t, err, "unsupported token type") | ||||
| 	_, err = Expr(struct{}{}) | ||||
| 	assert.ErrorContains(t, err, "unsupported token type") | ||||
| 
 | ||||
| 	cases := []struct { | ||||
| 		expr string | ||||
| 		want any | ||||
| 	}{ | ||||
| 		{"-1", int64(-1)}, | ||||
| 		{"1 + 2", int64(3)}, | ||||
| 		{"3 - 2 + 4", int64(5)}, | ||||
| 		{"1 + 2 * 3", int64(7)}, | ||||
| 		{"1 + ( 2 * 3 )", int64(7)}, | ||||
| 		{"( 1 + 2 ) * 3", int64(9)}, | ||||
| 		{"( 1 + 2.0 ) / 3", float64(1)}, | ||||
| 		{"sum( 1 , 2 , 3 , 4 )", int64(10)}, | ||||
| 		{"100 + sum( 1 , 2 + 3 , 0.0 ) / 2", float64(103)}, | ||||
| 		{"100 * 5 / ( 5 + 15 )", int64(25)}, | ||||
| 		{"9 == 5", int64(0)}, | ||||
| 		{"5 == 5", int64(1)}, | ||||
| 		{"9 != 5", int64(1)}, | ||||
| 		{"5 != 5", int64(0)}, | ||||
| 		{"9 > 5", int64(1)}, | ||||
| 		{"5 > 9", int64(0)}, | ||||
| 		{"5 >= 9", int64(0)}, | ||||
| 		{"9 >= 9", int64(1)}, | ||||
| 		{"9 < 5", int64(0)}, | ||||
| 		{"5 < 9", int64(1)}, | ||||
| 		{"9 <= 5", int64(0)}, | ||||
| 		{"5 <= 5", int64(1)}, | ||||
| 		{"1 and 2", int64(1)}, // Golang template definition: non-zero values are all truth | ||||
| 		{"1 and 0", int64(0)}, | ||||
| 		{"0 and 0", int64(0)}, | ||||
| 		{"1 or 2", int64(1)}, | ||||
| 		{"1 or 0", int64(1)}, | ||||
| 		{"0 or 1", int64(1)}, | ||||
| 		{"0 or 0", int64(0)}, | ||||
| 		{"not 2 == 1", int64(1)}, | ||||
| 		{"not not ( 9 < 5 )", int64(0)}, | ||||
| 	} | ||||
| 
 | ||||
| 	for _, c := range cases { | ||||
| 		n, err := Expr(tokens(c.expr)...) | ||||
| 		if assert.NoError(t, err, "expr: %s", c.expr) { | ||||
| 			assert.Equal(t, c.want, n.Value) | ||||
| 		} | ||||
| 	} | ||||
| 
 | ||||
| 	bads := []struct { | ||||
| 		expr   string | ||||
| 		errMsg string | ||||
| 	}{ | ||||
| 		{"0 / 0", "integer divide by zero"}, | ||||
| 		{"1 +", "num stack is empty"}, | ||||
| 		{"+ 1", "num stack is empty"}, | ||||
| 		{"( 1", "incomplete sub-expression"}, | ||||
| 		{"1 )", "op stack is empty"}, // can not find the corresponding open bracket after the stack becomes empty | ||||
| 		{"1 , 2", "expect 1 value as final result"}, | ||||
| 		{"( 1 , 2 )", "too many values in one bracket"}, | ||||
| 		{"1 a 2", "unknown operator"}, | ||||
| 	} | ||||
| 	for _, c := range bads { | ||||
| 		_, err = Expr(tokens(c.expr)...) | ||||
| 		assert.ErrorContains(t, err, c.errMsg, "expr: %s", c.expr) | ||||
| 	} | ||||
| } | ||||
|  | @ -42,6 +42,7 @@ import ( | |||
| 	"code.gitea.io/gitea/modules/repository" | ||||
| 	"code.gitea.io/gitea/modules/setting" | ||||
| 	"code.gitea.io/gitea/modules/svg" | ||||
| 	"code.gitea.io/gitea/modules/templates/eval" | ||||
| 	"code.gitea.io/gitea/modules/timeutil" | ||||
| 	"code.gitea.io/gitea/modules/util" | ||||
| 	"code.gitea.io/gitea/services/gitdiff" | ||||
|  | @ -105,24 +106,9 @@ func NewFuncMap() []template.FuncMap { | |||
| 		"TimeSinceUnix": timeutil.TimeSinceUnix, | ||||
| 		"FileSize":      base.FileSize, | ||||
| 		"LocaleNumber":  LocaleNumber, | ||||
| 		"Subtract":      base.Subtract, | ||||
| 		"EntryIcon":     base.EntryIcon, | ||||
| 		"MigrationIcon": MigrationIcon, | ||||
| 		"Add": func(a ...int) int { | ||||
| 			sum := 0 | ||||
| 			for _, val := range a { | ||||
| 				sum += val | ||||
| 			} | ||||
| 			return sum | ||||
| 		}, | ||||
| 		"Mul": func(a ...int) int { | ||||
| 			sum := 1 | ||||
| 			for _, val := range a { | ||||
| 				sum *= val | ||||
| 			} | ||||
| 			return sum | ||||
| 		}, | ||||
| 		"ActionIcon": ActionIcon, | ||||
| 		"ActionIcon":    ActionIcon, | ||||
| 		"DateFmtLong": func(t time.Time) string { | ||||
| 			return t.Format(time.RFC1123Z) | ||||
| 		}, | ||||
|  | @ -377,7 +363,7 @@ func NewFuncMap() []template.FuncMap { | |||
| 		"QueryEscape": url.QueryEscape, | ||||
| 		"DotEscape":   DotEscape, | ||||
| 		"Iterate": func(arg interface{}) (items []int64) { | ||||
| 			count := util.ToInt64(arg) | ||||
| 			count, _ := util.ToInt64(arg) | ||||
| 			for i := int64(0); i < count; i++ { | ||||
| 				items = append(items, i) | ||||
| 			} | ||||
|  | @ -397,6 +383,7 @@ func NewFuncMap() []template.FuncMap { | |||
| 				curBranch, | ||||
| 			) | ||||
| 		}, | ||||
| 		"Eval": Eval, | ||||
| 	}} | ||||
| } | ||||
| 
 | ||||
|  | @ -472,28 +459,8 @@ func NewTextFuncMap() []texttmpl.FuncMap { | |||
| 			} | ||||
| 			return dict, nil | ||||
| 		}, | ||||
| 		"percentage": func(n int, values ...int) float32 { | ||||
| 			sum := 0 | ||||
| 			for i := 0; i < len(values); i++ { | ||||
| 				sum += values[i] | ||||
| 			} | ||||
| 			return float32(n) * 100 / float32(sum) | ||||
| 		}, | ||||
| 		"Add": func(a ...int) int { | ||||
| 			sum := 0 | ||||
| 			for _, val := range a { | ||||
| 				sum += val | ||||
| 			} | ||||
| 			return sum | ||||
| 		}, | ||||
| 		"Mul": func(a ...int) int { | ||||
| 			sum := 1 | ||||
| 			for _, val := range a { | ||||
| 				sum *= val | ||||
| 			} | ||||
| 			return sum | ||||
| 		}, | ||||
| 		"QueryEscape": url.QueryEscape, | ||||
| 		"Eval":        Eval, | ||||
| 	}} | ||||
| } | ||||
| 
 | ||||
|  | @ -944,6 +911,18 @@ func mirrorRemoteAddress(ctx context.Context, m *repo_model.Repository, remoteNa | |||
| 
 | ||||
| // LocaleNumber renders a number with a Custom Element, browser will render it with a locale number | ||||
| func LocaleNumber(v interface{}) template.HTML { | ||||
| 	num := util.ToInt64(v) | ||||
| 	num, _ := util.ToInt64(v) | ||||
| 	return template.HTML(fmt.Sprintf(`<gitea-locale-number data-number="%d">%d</gitea-locale-number>`, num, num)) | ||||
| } | ||||
| 
 | ||||
| // Eval the expression and return the result, see the comment of eval.Expr for details. | ||||
| // To use this helper function in templates, pass each token as a separate parameter. | ||||
| // | ||||
| //	{{ $int64 := Eval $var "+" 1 }} | ||||
| //	{{ $float64 := Eval $var "+" 1.0 }} | ||||
| // | ||||
| // Golang's template supports comparable int types, so the int64 result can be used in later statements like {{if lt $int64 10}} | ||||
| func Eval(tokens ...any) (any, error) { | ||||
| 	n, err := eval.Expr(tokens...) | ||||
| 	return n.Value, err | ||||
| } | ||||
|  |  | |||
|  | @ -9,7 +9,6 @@ import ( | |||
| 	"errors" | ||||
| 	"fmt" | ||||
| 	"math/big" | ||||
| 	"os" | ||||
| 	"strconv" | ||||
| 	"strings" | ||||
| 
 | ||||
|  | @ -198,14 +197,8 @@ func ToTitleCaseNoLower(s string) string { | |||
| 	return cases.Title(language.English, cases.NoLower).String(s) | ||||
| } | ||||
| 
 | ||||
| func logError(msg string, args ...any) { | ||||
| 	// TODO: the "util" package can not import the "modules/log" package, so we use the "fmt" package here temporarily. | ||||
| 	// In the future, we should decouple the dependency between them. | ||||
| 	_, _ = fmt.Fprintf(os.Stderr, msg, args...) | ||||
| } | ||||
| 
 | ||||
| // ToInt64 transform a given int into int64. | ||||
| func ToInt64(number interface{}) int64 { | ||||
| func ToInt64(number interface{}) (int64, error) { | ||||
| 	var value int64 | ||||
| 	switch v := number.(type) { | ||||
| 	case int: | ||||
|  | @ -218,6 +211,7 @@ func ToInt64(number interface{}) int64 { | |||
| 		value = int64(v) | ||||
| 	case int64: | ||||
| 		value = v | ||||
| 
 | ||||
| 	case uint: | ||||
| 		value = int64(v) | ||||
| 	case uint8: | ||||
|  | @ -228,13 +222,61 @@ func ToInt64(number interface{}) int64 { | |||
| 		value = int64(v) | ||||
| 	case uint64: | ||||
| 		value = int64(v) | ||||
| 
 | ||||
| 	case float32: | ||||
| 		value = int64(v) | ||||
| 	case float64: | ||||
| 		value = int64(v) | ||||
| 
 | ||||
| 	case string: | ||||
| 		var err error | ||||
| 		if value, err = strconv.ParseInt(v, 10, 64); err != nil { | ||||
| 			logError("strconv.ParseInt failed for %q: %v", v, err) | ||||
| 			return 0, err | ||||
| 		} | ||||
| 	default: | ||||
| 		logError("unable to convert %q to int64", v) | ||||
| 		return 0, fmt.Errorf("unable to convert %v to int64", number) | ||||
| 	} | ||||
| 	return value | ||||
| 	return value, nil | ||||
| } | ||||
| 
 | ||||
| // ToFloat64 transform a given int into float64. | ||||
| func ToFloat64(number interface{}) (float64, error) { | ||||
| 	var value float64 | ||||
| 	switch v := number.(type) { | ||||
| 	case int: | ||||
| 		value = float64(v) | ||||
| 	case int8: | ||||
| 		value = float64(v) | ||||
| 	case int16: | ||||
| 		value = float64(v) | ||||
| 	case int32: | ||||
| 		value = float64(v) | ||||
| 	case int64: | ||||
| 		value = float64(v) | ||||
| 
 | ||||
| 	case uint: | ||||
| 		value = float64(v) | ||||
| 	case uint8: | ||||
| 		value = float64(v) | ||||
| 	case uint16: | ||||
| 		value = float64(v) | ||||
| 	case uint32: | ||||
| 		value = float64(v) | ||||
| 	case uint64: | ||||
| 		value = float64(v) | ||||
| 
 | ||||
| 	case float32: | ||||
| 		value = float64(v) | ||||
| 	case float64: | ||||
| 		value = v | ||||
| 
 | ||||
| 	case string: | ||||
| 		var err error | ||||
| 		if value, err = strconv.ParseFloat(v, 64); err != nil { | ||||
| 			return 0, err | ||||
| 		} | ||||
| 	default: | ||||
| 		return 0, fmt.Errorf("unable to convert %v to float64", number) | ||||
| 	} | ||||
| 	return value, nil | ||||
| } | ||||
|  |  | |||
|  | @ -69,11 +69,12 @@ | |||
| 										<div class="commit-divergence"> | ||||
| 											<div class="bar-group"> | ||||
| 												<div class="count count-behind">{{.CommitsBehind}}</div> | ||||
| 												<div class="bar bar-behind" style="width: {{percentage .CommitsBehind .CommitsBehind .CommitsAhead}}%"></div> | ||||
| 												{{/* old code bears 0/0.0 = NaN output, so it might output invalid "width: NaNpx", it just works and doesn't caues any problem. */}} | ||||
| 												<div class="bar bar-behind" style="width: {{Eval 100 "*" .CommitsBehind "/" "(" .CommitsBehind "+" .CommitsAhead "+" 0.0 ")"}}%"></div> | ||||
| 											</div> | ||||
| 											<div class="bar-group"> | ||||
| 												<div class="count count-ahead">{{.CommitsAhead}}</div> | ||||
| 												<div class="bar bar-ahead" style="width: {{percentage .CommitsAhead .CommitsBehind .CommitsAhead}}%"></div> | ||||
| 												<div class="bar bar-ahead" style="width: {{Eval 100 "*" .CommitsAhead "/" "(" .CommitsBehind "+" .CommitsAhead "+" 0.0 ")"}}%"></div> | ||||
| 											</div> | ||||
| 										</div> | ||||
| 										{{end}} | ||||
|  |  | |||
|  | @ -2,7 +2,7 @@ | |||
| <div class="timeline-item commits-list"> | ||||
| {{range .comment.Commits}} | ||||
| 	{{$tag := printf "%s-%d" $.comment.HashTag $index}} | ||||
| 	{{$index = Add $index 1}} | ||||
| 	{{$index = Eval $index "+" 1}} | ||||
| 	<div class="singular-commit" id="{{$tag}}"> | ||||
| 		<span class="badge badge-commit">{{svg "octicon-git-commit"}}</span> | ||||
| 		{{if .User}} | ||||
|  |  | |||
|  | @ -1,4 +1,4 @@ | |||
| {{Add .file.Addition .file.Deletion}} | ||||
| <span class="diff-stats-bar gt-mx-3" data-tooltip-content="{{.root.locale.Tr "repo.diff.stats_desc_file" (Add .file.Addition .file.Deletion) .file.Addition .file.Deletion | Str2html}}"> | ||||
| {{Eval .file.Addition "+" .file.Deletion}} | ||||
| <span class="diff-stats-bar gt-mx-3" data-tooltip-content="{{.root.locale.Tr "repo.diff.stats_desc_file" (Eval .file.Addition "+" .file.Deletion) .file.Addition .file.Deletion | Str2html}}"> | ||||
| 	<div class="diff-stats-add-bar" style="width: {{DiffStatsWidth .file.Addition .file.Deletion}}%"></div> | ||||
| </span> | ||||
|  |  | |||
|  | @ -12,7 +12,7 @@ | |||
| 					<div class="ui breadcrumb field {{if .Err_TreePath}}error{{end}}"> | ||||
| 						<a class="section" href="{{$.BranchLink}}">{{.Repository.Name}}</a> | ||||
| 						{{$n := len .TreeNames}} | ||||
| 						{{$l := Subtract $n 1}} | ||||
| 						{{$l := Eval $n "-" 1}} | ||||
| 						{{range $i, $v := .TreeNames}} | ||||
| 							<div class="divider"> / </div> | ||||
| 							{{if eq $i $l}} | ||||
|  |  | |||
|  | @ -10,7 +10,7 @@ | |||
| 					<div class="ui breadcrumb field {{if .Err_TreePath}}error{{end}}"> | ||||
| 						<a class="section" href="{{$.BranchLink}}">{{.Repository.Name}}</a> | ||||
| 						{{$n := len .TreeNames}} | ||||
| 						{{$l := Subtract $n 1}} | ||||
| 						{{$l := Eval $n "-" 1}} | ||||
| 						{{range $i, $v := .TreeNames}} | ||||
| 							<div class="divider"> / </div> | ||||
| 							{{if eq $i $l}} | ||||
|  |  | |||
|  | @ -1,22 +1,22 @@ | |||
| <div id="rel-container"> | ||||
| 	<svg viewbox="{{Mul .Graph.MinColumn 5}} {{Mul .Graph.MinRow 12}} {{Add (Mul .Graph.Width 5) 5}} {{Mul .Graph.Height 12}}" width="{{Add (Mul .Graph.Width 10) 10}}px"> | ||||
| 	<svg viewbox="{{Eval .Graph.MinColumn "*" 5}} {{Eval .Graph.MinRow "*" 12}} {{Eval .Graph.Width "*" 5 "+" 5}} {{Eval .Graph.Height "*" 12}}" width="{{Eval .Graph.Width "*" 10 "+" 10}}px"> | ||||
| 		{{range $flowid, $flow := .Graph.Flows}} | ||||
| 			<g id="flow-{{$flow.ID}}" class="flow-group flow-color-{{$flow.ColorNumber}} flow-color-16-{{$flow.Color16}}" data-flow="{{$flow.ID}}" data-color="{{$flow.ColorNumber}}"> | ||||
| 				<path d="{{range $i, $glyph := $flow.Glyphs -}} | ||||
| 					{{- if or (eq $glyph.Glyph '*') (eq $glyph.Glyph '|') -}} | ||||
| 						M {{Add (Mul $glyph.Column 5) 5}} {{Add (Mul $glyph.Row 12) 0}} v 12 {{/* */ -}} | ||||
| 						M {{Eval $glyph.Column "*" 5 "+" 5}} {{Eval $glyph.Row "*" 12 "+" 0}} v 12 {{/* */ -}} | ||||
| 					{{- else if eq $glyph.Glyph '/' -}} | ||||
| 						M {{Add (Mul $glyph.Column 5) 10}} {{Add (Mul $glyph.Row 12) 0}} l -10 12 {{/* */ -}} | ||||
| 						M {{Eval $glyph.Column "*" 5 "+" 10}} {{Eval $glyph.Row "*" 12 "+" 0}} l -10 12 {{/* */ -}} | ||||
| 					{{- else if eq $glyph.Glyph '\\' -}} | ||||
| 						M {{Add (Mul $glyph.Column 5) 0}} {{Add (Mul $glyph.Row 12) 0}} l 10 12 {{/* */ -}} | ||||
| 						M {{Eval $glyph.Column "*" 5 "+" 0}} {{Eval $glyph.Row "*" 12 "+" 0}} l 10 12 {{/* */ -}} | ||||
| 					{{- else if or (eq $glyph.Glyph '-') (eq $glyph.Glyph '.') -}} | ||||
| 						M {{Add (Mul $glyph.Column 5) 0}} {{Add (Mul $glyph.Row 12) 12}} h 5 {{/* */ -}} | ||||
| 						M {{Eval $glyph.Column "*" 5 "+" 0}} {{Eval $glyph.Row "*" 12 "+" 12}} h 5 {{/* */ -}} | ||||
| 					{{- else if eq $glyph.Glyph '_' -}} | ||||
| 						M {{Add (Mul $glyph.Column 5) 0}} {{Add (Mul $glyph.Row 12) 12}} h 10 {{/* */ -}} | ||||
| 						M {{Eval $glyph.Column "*" 5 "+" 0}} {{Eval $glyph.Row "*" 12 "+" 12}} h 10 {{/* */ -}} | ||||
| 					{{- end -}} | ||||
| 				{{- end}}" stroke-width="1" fill="none" id="flow-{{$flow.ID}}-path" stroke-linecap="round"></path> | ||||
| 				{{range $flow.Commits}} | ||||
| 					<circle class="flow-commit" cx="{{Add (Mul .Column 5) 5}}" cy="{{Add (Mul .Row 12) 6}}" r="2.5" stroke="none" id="flow-commit-{{.Rev}}" data-rev="{{.Rev}}"></circle> | ||||
| 					<circle class="flow-commit" cx="{{Eval .Column "*" 5 "+" 5}}" cy="{{Eval .Row "*" 12 "+" 6}}" r="2.5" stroke="none" id="flow-commit-{{.Rev}}" data-rev="{{.Rev}}"></circle> | ||||
| 				{{end}} | ||||
| 			</g> | ||||
| 		{{end}} | ||||
|  |  | |||
|  | @ -37,7 +37,7 @@ | |||
| 		<div class="ui form gt-hidden gt-df gt-mt-4" id="topic_edit"> | ||||
| 			<div class="field gt-f1 gt-mr-3"> | ||||
| 				<div class="ui fluid multiple search selection dropdown" data-text-count-prompt="{{.locale.Tr "repo.topic.count_prompt"}}" data-text-format-prompt="{{.locale.Tr "repo.topic.format_prompt"}}"> | ||||
| 					<input type="hidden" name="topics" value="{{range $i, $v := .Topics}}{{.Name}}{{if lt (Add $i 1) (len $.Topics)}},{{end}}{{end}}"> | ||||
| 					<input type="hidden" name="topics" value="{{range $i, $v := .Topics}}{{.Name}}{{if Eval $i "+" 1 "<" (len $.Topics)}},{{end}}{{end}}"> | ||||
| 					{{range .Topics}} | ||||
| 						{{/* keey the same layout as Fomantic UI generated labels */}} | ||||
| 						<a class="ui label transition visible gt-cursor-default" data-value="{{.Name}}" style="display: inline-block !important;">{{.Name}}{{svg "octicon-x" 16 "delete icon"}}</a> | ||||
|  | @ -61,7 +61,7 @@ | |||
| 			<div class="gt-df gt-ac gt-fw gt-gap-y-3"> | ||||
| 				{{template "repo/branch_dropdown" dict "root" .}} | ||||
| 				{{$n := len .TreeNames}} | ||||
| 				{{$l := Subtract $n 1}} | ||||
| 				{{$l := Eval $n "-" 1}} | ||||
| 				<!-- If home page, show new pr. If not, show breadcrumb --> | ||||
| 				{{if eq $n 0}} | ||||
| 					{{if and .CanCompareOrPull .IsViewBranch (not .Repository.IsArchived)}} | ||||
|  |  | |||
|  | @ -100,7 +100,7 @@ | |||
| 				<table> | ||||
| 					<tbody> | ||||
| 						{{range $idx, $code := .FileContent}} | ||||
| 						{{$line := Add $idx 1}} | ||||
| 						{{$line := Eval $idx "+" 1}} | ||||
| 						<tr> | ||||
| 							<td id="L{{$line}}" class="lines-num"><span id="L{{$line}}" data-line-number="{{$line}}"></span></td> | ||||
| 							{{if $.EscapeStatus.Escaped}} | ||||
|  |  | |||
|  | @ -80,8 +80,8 @@ | |||
| 							</summary> | ||||
| 							{{$level := 0}} | ||||
| 							{{range .toc}} | ||||
| 								{{if lt $level .Level}}{{range Iterate (Subtract .Level $level)}}<ul>{{end}}{{end}} | ||||
| 								{{if gt $level .Level}}{{range Iterate (Subtract $level .Level)}}</ul>{{end}}{{end}} | ||||
| 								{{if lt $level .Level}}{{range Iterate (Eval .Level "-" $level)}}<ul>{{end}}{{end}} | ||||
| 								{{if gt $level .Level}}{{range Iterate (Eval $level "-" .Level)}}</ul>{{end}}{{end}} | ||||
| 								{{$level = .Level}} | ||||
| 								<li><a href="#{{.ID}}">{{.Text}}</a></li> | ||||
| 							{{end}} | ||||
|  |  | |||
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