-
Notifications
You must be signed in to change notification settings - Fork 0
/
tmplstr-parser.go
51 lines (47 loc) · 1.82 KB
/
tmplstr-parser.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
// Copyright (c) 2024 The Go-CoreLibs Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package tmplstr
import (
"github.com/alecthomas/participle/v2"
"github.com/alecthomas/participle/v2/lexer"
)
const (
gScalarPattern = `[a-zA-Z][_a-zA-Z0-9]*(\.[a-zA-Z][_a-zA-Z0-9]*)*`
)
var (
gTemplateLexer = lexer.MustSimple([]lexer.SimpleRule{
{Name: `Range`, Pattern: `range\s+(?:\$` + gScalarPattern + `)(?:\s*,\s*\$` + gScalarPattern + `)?\s+\:=`},
{Name: `Assignment`, Pattern: `\$` + gScalarPattern + `\s+:??=`},
{Name: `Ident`, Pattern: `[_a-zA-Z][_a-zA-Z0-9]*`},
{Name: `Keyword`, Pattern: `[.$]` + gScalarPattern},
{Name: `Literal`, Pattern: "`[^`]+?`"},
{Name: `String`, Pattern: `"(?:(\\"|[^"])+?)*"`},
{Name: `Rune`, Pattern: `'(?:(\\'|[^'])+?)+'`},
{Name: `Float`, Pattern: `\d+\.\d+`},
{Name: `Int`, Pattern: `\d+`},
{Name: `Comment`, Pattern: `/\*(?:.+?)\*/`},
{Name: `Space`, Pattern: `\s+`},
{Name: `Pipe`, Pattern: `\|`},
{Name: `GroupOpen`, Pattern: `\(`},
{Name: `GroupClose`, Pattern: `\)`},
{Name: `StatementOpen`, Pattern: `\{\{\-?`},
{Name: `StatementClose`, Pattern: `\-?\}\}`},
{Name: `Text`, Pattern: `.+`},
})
gTemplateParser = participle.MustBuild[Action](
participle.Lexer(gTemplateLexer),
participle.Unquote("Literal", "String", "Rune"),
participle.UseLookahead(1024),
)
)