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// nolint: golint, dupl | ||
package main | ||
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import ( | ||
"os" | ||
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"github.com/alecthomas/kong" | ||
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"github.com/alecthomas/participle/v2" | ||
"github.com/alecthomas/participle/v2/lexer" | ||
) | ||
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var ( | ||
jsonLexer = lexer.MustSimple([]lexer.SimpleRule{ | ||
{Name: "Comment", Pattern: `\/\/[^\n]*`}, | ||
{Name: "String", Pattern: `"(\\"|[^"])*"`}, | ||
{Name: "Number", Pattern: `[-+]?(\d*\.)?\d+`}, | ||
{Name: "Punct", Pattern: `[-[!@#$%^&*()+_={}\|:;"'<,>.?/]|]`}, | ||
{Name: "Null", Pattern: "null"}, | ||
{Name: "True", Pattern: "true"}, | ||
{Name: "False", Pattern: "false"}, | ||
{Name: "EOL", Pattern: `[\n\r]+`}, | ||
{Name: "Whitespace", Pattern: `[ \t\n\r]+`}, | ||
}) | ||
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jsonParser = participle.MustBuild[Json]( | ||
participle.Lexer(jsonLexer), | ||
participle.Unquote("String"), | ||
participle.Elide("Whitespace", "EOL"), | ||
participle.UseLookahead(2), | ||
) | ||
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cli struct { | ||
File string `arg:"" type:"existingfile" help:"File to parse."` | ||
} | ||
) | ||
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// Parse a Json string. | ||
func Parse(data []byte) (*Json, error) { | ||
json, err := jsonParser.ParseBytes("", data) | ||
if err != nil { | ||
return nil, err | ||
} | ||
return json, nil | ||
} | ||
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type Json struct { | ||
Pos lexer.Position | ||
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Object *Object `parser:"@@ |"` | ||
Array *Array `parser:"@@ |"` | ||
Number *string `parser:"@Number |"` | ||
String *string `parser:"@String |"` | ||
False *string `parser:"@False |"` | ||
True *string `parser:"@True |"` | ||
Null *string `parser:"@Null"` | ||
} | ||
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type Object struct { | ||
Pos lexer.Position | ||
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Pairs []*Pair `parser:"'{' @@ (',' @@)* '}'"` | ||
} | ||
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type Pair struct { | ||
Pos lexer.Position | ||
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Key string `parser:"@String ':'"` | ||
Value *Json `parser:"@@"` | ||
} | ||
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type Array struct { | ||
Pos lexer.Position | ||
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Items []*Json `parser:"'[' @@ (',' @@)* ']'"` | ||
} | ||
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func main() { | ||
ctx := kong.Parse(&cli) | ||
data, err := os.ReadFile(cli.File) | ||
ctx.FatalIfErrorf(err) | ||
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res, err := Parse(data) | ||
ctx.FatalIfErrorf(err) | ||
ctx.Printf("res is: %v", res) | ||
} |
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package main | ||
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import ( | ||
"os" | ||
"testing" | ||
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require "github.com/alecthomas/assert/v2" | ||
) | ||
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func TestParse(t *testing.T) { | ||
src, err := os.ReadFile("./test.json") | ||
require.NoError(t, err) | ||
_, err = Parse(src) | ||
require.NoError(t, err) | ||
} |
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{ | ||
"list": [1, 1.2, 1, -1, {"foo": "bar"}, true, false, null], | ||
"object": { | ||
"foo1": "bar2", | ||
"foo2": true, | ||
"foo3": false, | ||
"foo4": null, | ||
"foo5": 1, | ||
"foo6": "ss" | ||
} | ||
} |