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|
%{
// Copyright (c) 2020-2022, Maxime Soulé
// All rights reserved.
//
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree.
package json
type Placeholder struct {
Num int
Name string
}
type Operator struct {
Name string
Params []any
}
type member struct {
key string
value any
}
func finalize(l yyLexer, value any) {
l.(*json).value = value
}
%}
%union {
object map[string]any
member member
array []any
string string
value any
}
%start json
%token <value> TRUE FALSE NULL NUMBER PLACEHOLDER SUB_PARSER
%token <string> STRING OPERATOR
%type <object> object members
%type <member> member
%type <array> array elements op_params
%type <value> json value operator
%%
json: value
{
$$ = $1
finalize(yylex, $$)
}
value:
object { $$ = $1 }
| array { $$ = $1 }
| operator { $$ = $1 }
| SUB_PARSER { $$ = $1 }
| STRING { $$ = $1 }
| NUMBER
| TRUE
| FALSE
| NULL
| PLACEHOLDER
;
object: '{' '}'
{
$$ = map[string]any{}
}
| '{' members '}'
{
$$ = $2
}
| '{' members ',' '}' // not JSON spec but useful
{
$$ = $2
}
members: member
{
$$ = map[string]any{
$1.key: $1.value,
}
}
| members ',' member
{
$1[$3.key] = $3.value
$$ = $1
}
member: STRING ':' value
{
$$ = member{
key: $1,
value: $3,
}
}
array: '[' ']'
{
$$ = []any{}
}
| '[' elements ']'
{
$$ = $2
}
| '[' elements ',' ']' // not JSON spec but useful
{
$$ = $2
}
elements: value
{
$$ = []any{$1}
}
| elements ',' value
{
$$ = append($1, $3)
}
op_params: '(' ')'
{
$$ = []any{}
}
| '(' elements ')'
{
$$ = $2
}
| '(' elements ',' ')'
{
$$ = $2
}
operator:
OPERATOR op_params
{
op := yylex.(*json).newOperator($1, $2)
if op == nil {
return 1
}
$$ = op
}
| OPERATOR
{
op := yylex.(*json).newOperator($1, nil)
if op == nil {
return 1
}
$$ = op
}
%%
|
