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Author SHA1 Message Date
Elara6331
cbbaee47d4 Mention the ability to ignore missing includes/macros in README 2025-02-11 16:43:43 -08:00
Elara6331
bcb8222ebf Support iterator functions and range-over-int 2025-02-11 16:40:53 -08:00
Elara6331
6d260619b7 Run formatter 2025-02-11 16:39:35 -08:00
Elara6331
944663c2b1 Split some expression code into separate functions 2024-06-06 19:17:20 -07:00
Elara6331
c5470a45dd Define the behavior of nil better 2024-06-06 19:12:59 -07:00
Elara6331
849295bb5f Allow the != operator to be used on nil 2024-06-06 19:09:50 -07:00
Elara6331
d5c33f9e5d Add nil keyword 2024-06-06 19:06:45 -07:00
Elara6331
f1a998c25b Update example bulma version 2024-06-06 18:52:26 -07:00
Elara6331
167f448ae1 Improve ternary expression parsing definition 2024-06-06 18:52:14 -07:00
12 changed files with 645 additions and 518 deletions
Expand all files Collapse all files

6
README.md
View File

@@ -99,7 +99,7 @@ In this example:
### `for` tag
Salix's `for` tag is used for iterating over slices, arrays, and maps. It can assign one or two variables depending on your needs. When using a single variable, it sets that variable to the current element in the case of slices or arrays, or the current value for maps. With two variables, it assigns the first to the index (in the case of slices or arrays) or the key (for maps), and the second to the element or value, respectively. Here's an example of the for tag in action:
Salix's `for` tag is used for iterating over iterable variables, such as slices, maps, iterator functions, etc. It can assign one or two variables depending on your needs. When using a single variable, it sets that variable to the current element in the case of slices or arrays, or the current value for maps. With two variables, it assigns the first to the index (in the case of slices or arrays) or the key (for maps), and the second to the element or value, respectively. Here's an example of the for tag in action:
```
#for(id, name in users):
@@ -129,6 +129,8 @@ The include tag allows you to import content from other templates in the namespa
#include("header.html")
```
If the file name starts with a question mark, nonexistent files will be ignored.
#### Using the `include` tag with extra arguments
The `include` tag can accept extra local variables as arguments. Here's an example with a `title` variable:
@@ -153,6 +155,8 @@ The macro tag is a powerful feature that allows you to define reusable template
When a macro tag has a block, it sets the macro's content. When it doesn't, it inserts the contents of the macro. In the above example, a macro is defined and then inserted.
If the macro name starts with a question mark, nonexistent macros will be ignored.
#### Using the `macro` tag with extra arguments
Similar to the `include` tag, the `macro` tag can accept extra local variables as arguments. You can define these variables when including the macro. Here's an example:

8
ast/ast.go
View File

@@ -20,6 +20,14 @@ func (p Position) String() string {
return fmt.Sprintf("%s: line %d, col %d", p.Name, p.Line, p.Col)
}
type Nil struct {
Position Position
}
func (n Nil) Pos() Position {
return n.Position
}
type Tag struct {
Name Ident
Params []Node

2
examples/include/tmpls/head.html
View File

@@ -1,4 +1,4 @@
<head>
<title>#(title)</title>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bulma@0.9.4/css/bulma.min.css">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bulma@1.0.0/css/bulma.min.css">
</head>

2
examples/macro/tmpls/base.html
View File

@@ -1,7 +1,7 @@
<html>
<head>
<title>#(title)</title>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bulma@0.9.4/css/bulma.min.css">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bulma@1.0.0/css/bulma.min.css">
</head>
<body>
<nav class="navbar is-dark">

11
examples/readme/readme.salix.html
View File

@@ -1,8 +1,10 @@
<html>
<head>
<head>
<title>#(page.Title)</title>
</head>
<body>
</head>
<body>
#for(i, user in users):
<div>
<h2>#(toLower(user.Name))</h2>
@@ -12,5 +14,6 @@
<p>Registered: #(user.RegisteredTime.Format("01-02-2006"))</p>
</div>
#!for
</body>
</body>
</html>

74
expr.go
View File

@@ -32,28 +32,14 @@ func (t *Template) evalExpr(expr ast.Expr, local map[string]any) (any, error) {
return a.Interface(), nil
}
func (t *Template) performOp(a, b reflect.Value, op ast.Operator) (any, error) {
func (t *Template) performOp(a, b reflect.Value, op ast.Operator) (result any, err error) {
if op.Value == "in" {
switch b.Kind() {
case reflect.Slice, reflect.Array:
if a.CanConvert(b.Type().Elem()) {
a = a.Convert(b.Type().Elem())
} else {
return nil, ast.PosError(op, "mismatched types in expression (%s and %s)", a.Type(), b.Type())
}
case reflect.Map:
if a.CanConvert(b.Type().Key()) {
a = a.Convert(b.Type().Key())
} else {
return nil, ast.PosError(op, "mismatched types in expression (%s and %s)", a.Type(), b.Type())
}
case reflect.String:
if a.Kind() != reflect.String {
return nil, ast.PosError(op, "mismatched types in expression (%s and %s)", a.Type(), b.Type())
}
default:
return nil, ast.PosError(op, "the in operator can only be used on strings, arrays, and slices (got %s and %s)", a.Type(), b.Type())
a, b, err = handleIn(op, a, b)
if err != nil {
return nil, err
}
} else if !a.IsValid() || !b.IsValid() {
return handleNil(op, a, b)
} else if b.CanConvert(a.Type()) {
b = b.Convert(a.Type())
} else {
@@ -174,3 +160,51 @@ func (t *Template) performOp(a, b reflect.Value, op ast.Operator) (any, error) {
}
return false, ast.PosError(op, "unknown operator: %q", op.Value)
}
func handleIn(op ast.Operator, a, b reflect.Value) (c, d reflect.Value, err error) {
switch b.Kind() {
case reflect.Slice, reflect.Array:
if a.CanConvert(b.Type().Elem()) {
a = a.Convert(b.Type().Elem())
} else {
return a, b, ast.PosError(op, "mismatched types in expression (%s and %s)", a.Type(), b.Type())
}
case reflect.Map:
if a.CanConvert(b.Type().Key()) {
a = a.Convert(b.Type().Key())
} else {
return a, b, ast.PosError(op, "mismatched types in expression (%s and %s)", a.Type(), b.Type())
}
case reflect.String:
if a.Kind() != reflect.String {
return a, b, ast.PosError(op, "mismatched types in expression (%s and %s)", a.Type(), b.Type())
}
default:
return a, b, ast.PosError(op, "the in operator can only be used on strings, arrays, and slices (got %s and %s)", a.Type(), b.Type())
}
return a, b, nil
}
func handleNil(op ast.Operator, a, b reflect.Value) (any, error) {
if !a.IsValid() && !b.IsValid() {
return true, nil
} else if !a.IsValid() {
return nil, ast.PosError(op, "nil must be on the right side of an expression")
} else if !b.IsValid() {
if op.Value != "==" && op.Value != "!=" {
return nil, ast.PosError(op, "invalid operator for nil value (expected == or !=, got %s)", op.Value)
}
switch a.Kind() {
case reflect.Chan, reflect.Slice, reflect.Map, reflect.Func, reflect.Interface, reflect.Pointer:
if op.Value == "==" {
return a.IsNil(), nil
} else {
return !a.IsNil(), nil
}
default:
return nil, ast.PosError(op, "values of type %s cannot be compared against nil", a.Type())
}
}
return nil, nil
}

41
for_tag.go
View File

@@ -55,6 +55,15 @@ func (ft forTag) Run(tc *TagContext, block, args []ast.Node) error {
in = reflect.ValueOf(val)
switch in.Kind() {
case reflect.Int:
local := map[string]any{}
for i := range in.Int() {
local[vars[0]] = i
err = tc.Execute(block, local)
if err != nil {
return err
}
}
case reflect.Slice, reflect.Array:
local := map[string]any{}
for i := 0; i < in.Len(); i++ {
@@ -95,6 +104,38 @@ func (ft forTag) Run(tc *TagContext, block, args []ast.Node) error {
i++
}
case reflect.Func:
local := map[string]any{}
i := 0
if len(vars) == 1 {
for val := range in.Seq() {
local[vars[0]] = val.Interface()
err = tc.Execute(block, local)
if err != nil {
return err
}
}
} else if len(vars) == 2 {
for val1, val2 := range in.Seq2() {
local[vars[0]] = val1.Interface()
local[vars[1]] = val2.Interface()
err = tc.Execute(block, local)
if err != nil {
return err
}
}
} else {
for val1, val2 := range in.Seq2() {
local[vars[0]] = i
local[vars[1]] = val1.Interface()
local[vars[2]] = val2.Interface()
err = tc.Execute(block, local)
if err != nil {
return err
}
i++
}
}
}
return nil

2
go.mod
View File

@@ -1,3 +1,3 @@
module go.elara.ws/salix
go 1.21.2
go 1.23.0

956
parser/parser.go
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File diff suppressed because it is too large Load Diff

31
parser/salix.peg
View File

@@ -83,8 +83,21 @@ ExprTag = '#' ignoreErr:'?'? '(' item:Expr ')' {
}, nil
}
Expr = Ternary / Assignment / LogicalExpr
Assignable = Ternary / LogicalExpr
Expr = Assignment / TernaryExpr
Assignable = TernaryExpr
TernaryExpr = _ cond:LogicalExpr vals:(_ '?' _ Value _ ':' _ Value)? {
if vals == nil {
return cond, nil
} else {
s := toAnySlice(vals)
return ast.Ternary{
Condition: cond.(ast.Node),
IfTrue: s[3].(ast.Node),
Else: s[7].(ast.Node),
}, nil
}
}
LogicalExpr = _ first:ComparisonExpr rest:(_ LogicalOp _ ComparisonExpr)* _ {
return toExpr(c, first, rest), nil
@@ -116,7 +129,7 @@ ParamList = '(' params:(Expr ( ',' _ Expr )* )? ')' {
return out, nil
}
Value = not:"!"? node:(MethodCall / FieldAccess / Index / String / RawString / Float / Integer / Bool / FuncCall / VariableOr / Ident / ParenExpr / Array / Map) {
Value = not:"!"? node:(Nil / MethodCall / FieldAccess / Index / String / RawString / Float / Integer / Bool / FuncCall / VariableOr / Ident / ParenExpr / Array / Map) {
return ast.Value{
Node: node.(ast.Node),
Not: not != nil,
@@ -174,14 +187,6 @@ Assignment = name:Ident _ '=' _ value:Assignable {
}, nil
}
Ternary = cond:Assignable _ '?' _ ifTrue:Value _ ':' _ elseVal:Value {
return ast.Ternary{
Condition: cond.(ast.Node),
IfTrue: ifTrue.(ast.Node),
Else: elseVal.(ast.Node),
}, nil
}
MethodCall = value:Value '.' name:Ident params:ParamList {
return ast.MethodCall{
Value: value.(ast.Node),
@@ -283,6 +288,10 @@ ArithmeticOp = ('+' / '-' / '/' / '*' / '%') {
}, nil
}
Nil = "nil" {
return ast.Nil{Position: getPos(c)}, nil
}
Text = . [^#]* { return ast.Text{Data: c.text, Position: getPos(c)}, nil }
_ "whitespace" ← [ \t\r\n]*

2
salix.go
View File

@@ -239,6 +239,8 @@ func (t *Template) getValue(node ast.Node, local map[string]any) (any, error) {
return t.convertArray(node, local)
case ast.Assignment:
return node, t.handleAssignment(node, local)
case ast.Nil:
return nil, nil
default:
return nil, nil
}