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    <p>What about using the standard goyacc tool? Here is a skeleton:</p> <h2>main.y</h2> <pre><code>%{ package main import ( "fmt" "log" ) %} %union{ tok int val interface{} pair struct{key, val interface{}} pairs map[interface{}]interface{} } %token KEY %token VAL %type &lt;val&gt; KEY VAL %type &lt;pair&gt; pair %type &lt;pairs&gt; pairs %% goal: '{' pairs '}' { yylex.(*lex).m = $2 } pairs: pair { $$ = map[interface{}]interface{}{$1.key: $1.val} } | pairs '|' pair { $$[$3.key] = $3.val } pair: KEY '=' VAL { $$.key, $$.val = $1, $3 } | KEY '=' '{' pairs '}' { $$.key, $$.val = $1, $4 } %% type token struct { tok int val interface{} } type lex struct { tokens []token m map[interface{}]interface{} } func (l *lex) Lex(lval *yySymType) int { if len(l.tokens) == 0 { return 0 } v := l.tokens[0] l.tokens = l.tokens[1:] lval.val = v.val return v.tok } func (l *lex) Error(e string) { log.Fatal(e) } func main() { l := &amp;lex{ // {key1 = value1 | key2 = {key3 = value3} | key4 = {key5 = { key6 = value6 }}} []token{ {'{', ""}, {KEY, "key1"}, {'=', ""}, {VAL, "value1"}, {'|', ""}, {KEY, "key2"}, {'=', ""}, {'{', ""}, {KEY, "key3"}, {'=', ""}, {VAL, "value3"}, {'}', ""}, {'|', ""}, {KEY, "key4"}, {'=', ""}, {'{', ""}, {KEY, "key5"}, {'=', ""}, {'{', ""}, {KEY, "key6"}, {'=', ""}, {VAL, "value6"}, {'}', ""}, {'}', ""}, {'}', ""}, }, map[interface{}]interface{}{}, } yyParse(l) fmt.Println(l.m) } </code></pre> <h2>Output</h2> <pre><code>$ go tool yacc -o main.go main.y &amp;&amp; go run main.go map[key4:map[key5:map[key6:value6]] key1:value1 key2:map[key3:value3]] $ </code></pre>
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    1. COcurrently the first command would be: $go tool yacc -o main.go main.y
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