179 lines
2.3 KiB
Plaintext
179 lines
2.3 KiB
Plaintext
// This is the yacc input for creating the parser for HCL JSON.
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%{
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package json
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import (
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"fmt"
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"strconv"
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"github.com/hashicorp/hcl/ast"
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)
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%}
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%union {
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array ast.ListNode
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assign ast.AssignmentNode
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item ast.Node
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klist []ast.AssignmentNode
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list []ast.Node
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num int
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str string
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obj ast.ObjectNode
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}
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%type <array> array
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%type <assign> pair
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%type <item> value number
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%type <klist> members
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%type <list> elements
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%type <num> int
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%type <obj> object
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%type <str> frac
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%token <num> NUMBER
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%token <str> COLON COMMA IDENTIFIER EQUAL NEWLINE STRING
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%token <str> LEFTBRACE RIGHTBRACE LEFTBRACKET RIGHTBRACKET
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%token <str> TRUE FALSE NULL MINUS PERIOD
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%%
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top:
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object
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{
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obj := $1
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jsonResult = &obj
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}
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object:
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LEFTBRACE members RIGHTBRACE
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{
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$$ = ast.ObjectNode{Elem: $2}
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}
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| LEFTBRACE RIGHTBRACE
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{
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$$ = ast.ObjectNode{}
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}
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members:
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pair
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{
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$$ = []ast.AssignmentNode{$1}
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}
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| members COMMA pair
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{
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$$ = append($1, $3)
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}
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pair:
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STRING COLON value
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{
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$$ = ast.AssignmentNode{
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K: $1,
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Value: $3,
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}
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}
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value:
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STRING
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{
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$$ = ast.LiteralNode{
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Type: ast.ValueTypeString,
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Value: $1,
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}
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}
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| number
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{
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$$ = $1
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}
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| object
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{
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$$ = $1
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}
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| array
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{
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$$ = $1
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}
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| TRUE
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{
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$$ = ast.LiteralNode{
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Type: ast.ValueTypeBool,
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Value: true,
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}
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}
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| FALSE
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{
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$$ = ast.LiteralNode{
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Type: ast.ValueTypeBool,
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Value: false,
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}
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}
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| NULL
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{
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$$ = ast.LiteralNode{
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Type: ast.ValueTypeNil,
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Value: nil,
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}
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}
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array:
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LEFTBRACKET RIGHTBRACKET
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{
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$$ = ast.ListNode{}
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}
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| LEFTBRACKET elements RIGHTBRACKET
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{
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$$ = ast.ListNode{Elem: $2}
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}
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elements:
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value
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{
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$$ = []ast.Node{$1}
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}
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| elements COMMA value
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{
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$$ = append($1, $3)
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}
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number:
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int
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{
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$$ = ast.LiteralNode{
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Type: ast.ValueTypeInt,
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Value: $1,
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}
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}
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| int frac
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{
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fs := fmt.Sprintf("%d.%s", $1, $2)
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f, err := strconv.ParseFloat(fs, 64)
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if err != nil {
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panic(err)
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}
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$$ = ast.LiteralNode{
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Type: ast.ValueTypeFloat,
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Value: f,
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}
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}
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int:
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MINUS int
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{
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$$ = $2 * -1
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}
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| NUMBER
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{
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$$ = $1
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}
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frac:
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PERIOD NUMBER
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{
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$$ = strconv.FormatInt(int64($2), 10)
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}
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%%
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