1 files changed, 313 insertions, 0 deletions

diff --git a/vendor/github.com/hashicorp/hcl/json/parser/parser.go b/vendor/github.com/hashicorp/hcl/json/parser/parser.go
new file mode 100644
index 0000000..125a5f0
--- /dev/null
+++ b/vendor/github.com/hashicorp/hcl/json/parser/parser.go
@@ -0,0 +1,313 @@
+package parser
+
+import (
+        "errors"
+        "fmt"
+
+        "github.com/hashicorp/hcl/hcl/ast"
+        hcltoken "github.com/hashicorp/hcl/hcl/token"
+        "github.com/hashicorp/hcl/json/scanner"
+        "github.com/hashicorp/hcl/json/token"
+)
+
+type Parser struct {
+        sc *scanner.Scanner
+
+        // Last read token
+        tok       token.Token
+        commaPrev token.Token
+
+        enableTrace bool
+        indent      int
+        n           int // buffer size (max = 1)
+}
+
+func newParser(src []byte) *Parser {
+        return &Parser{
+                sc: scanner.New(src),
+        }
+}
+
+// Parse returns the fully parsed source and returns the abstract syntax tree.
+func Parse(src []byte) (*ast.File, error) {
+        p := newParser(src)
+        return p.Parse()
+}
+
+var errEofToken = errors.New("EOF token found")
+
+// Parse returns the fully parsed source and returns the abstract syntax tree.
+func (p *Parser) Parse() (*ast.File, error) {
+        f := &ast.File{}
+        var err, scerr error
+        p.sc.Error = func(pos token.Pos, msg string) {
+                scerr = fmt.Errorf("%s: %s", pos, msg)
+        }
+
+        // The root must be an object in JSON
+        object, err := p.object()
+        if scerr != nil {
+                return nil, scerr
+        }
+        if err != nil {
+                return nil, err
+        }
+
+        // We make our final node an object list so it is more HCL compatible
+        f.Node = object.List
+
+        // Flatten it, which finds patterns and turns them into more HCL-like
+        // AST trees.
+        flattenObjects(f.Node)
+
+        return f, nil
+}
+
+func (p *Parser) objectList() (*ast.ObjectList, error) {
+        defer un(trace(p, "ParseObjectList"))
+        node := &ast.ObjectList{}
+
+        for {
+                n, err := p.objectItem()
+                if err == errEofToken {
+                        break // we are finished
+                }
+
+                // we don't return a nil node, because might want to use already
+                // collected items.
+                if err != nil {
+                        return node, err
+                }
+
+                node.Add(n)
+
+                // Check for a followup comma. If it isn't a comma, then we're done
+                if tok := p.scan(); tok.Type != token.COMMA {
+                        break
+                }
+        }
+
+        return node, nil
+}
+
+// objectItem parses a single object item
+func (p *Parser) objectItem() (*ast.ObjectItem, error) {
+        defer un(trace(p, "ParseObjectItem"))
+
+        keys, err := p.objectKey()
+        if err != nil {
+                return nil, err
+        }
+
+        o := &ast.ObjectItem{
+                Keys: keys,
+        }
+
+        switch p.tok.Type {
+        case token.COLON:
+                pos := p.tok.Pos
+                o.Assign = hcltoken.Pos{
+                        Filename: pos.Filename,
+                        Offset:   pos.Offset,
+                        Line:     pos.Line,
+                        Column:   pos.Column,
+                }
+
+                o.Val, err = p.objectValue()
+                if err != nil {
+                        return nil, err
+                }
+        }
+
+        return o, nil
+}
+
+// objectKey parses an object key and returns a ObjectKey AST
+func (p *Parser) objectKey() ([]*ast.ObjectKey, error) {
+        keyCount := 0
+        keys := make([]*ast.ObjectKey, 0)
+
+        for {
+                tok := p.scan()
+                switch tok.Type {
+                case token.EOF:
+                        return nil, errEofToken
+                case token.STRING:
+                        keyCount++
+                        keys = append(keys, &ast.ObjectKey{
+                                Token: p.tok.HCLToken(),
+                        })
+                case token.COLON:
+                        // If we have a zero keycount it means that we never got
+                        // an object key, i.e. `{ :`. This is a syntax error.
+                        if keyCount == 0 {
+                                return nil, fmt.Errorf("expected: STRING got: %s", p.tok.Type)
+                        }
+
+                        // Done
+                        return keys, nil
+                case token.ILLEGAL:
+                        return nil, errors.New("illegal")
+                default:
+                        return nil, fmt.Errorf("expected: STRING got: %s", p.tok.Type)
+                }
+        }
+}
+
+// object parses any type of object, such as number, bool, string, object or
+// list.
+func (p *Parser) objectValue() (ast.Node, error) {
+        defer un(trace(p, "ParseObjectValue"))
+        tok := p.scan()
+
+        switch tok.Type {
+        case token.NUMBER, token.FLOAT, token.BOOL, token.NULL, token.STRING:
+                return p.literalType()
+        case token.LBRACE:
+                return p.objectType()
+        case token.LBRACK:
+                return p.listType()
+        case token.EOF:
+                return nil, errEofToken
+        }
+
+        return nil, fmt.Errorf("Expected object value, got unknown token: %+v", tok)
+}
+
+// object parses any type of object, such as number, bool, string, object or
+// list.
+func (p *Parser) object() (*ast.ObjectType, error) {
+        defer un(trace(p, "ParseType"))
+        tok := p.scan()
+
+        switch tok.Type {
+        case token.LBRACE:
+                return p.objectType()
+        case token.EOF:
+                return nil, errEofToken
+        }
+
+        return nil, fmt.Errorf("Expected object, got unknown token: %+v", tok)
+}
+
+// objectType parses an object type and returns a ObjectType AST
+func (p *Parser) objectType() (*ast.ObjectType, error) {
+        defer un(trace(p, "ParseObjectType"))
+
+        // we assume that the currently scanned token is a LBRACE
+        o := &ast.ObjectType{}
+
+        l, err := p.objectList()
+
+        // if we hit RBRACE, we are good to go (means we parsed all Items), if it's
+        // not a RBRACE, it's an syntax error and we just return it.
+        if err != nil && p.tok.Type != token.RBRACE {
+                return nil, err
+        }
+
+        o.List = l
+        return o, nil
+}
+
+// listType parses a list type and returns a ListType AST
+func (p *Parser) listType() (*ast.ListType, error) {
+        defer un(trace(p, "ParseListType"))
+
+        // we assume that the currently scanned token is a LBRACK
+        l := &ast.ListType{}
+
+        for {
+                tok := p.scan()
+                switch tok.Type {
+                case token.NUMBER, token.FLOAT, token.STRING:
+                        node, err := p.literalType()
+                        if err != nil {
+                                return nil, err
+                        }
+
+                        l.Add(node)
+                case token.COMMA:
+                        continue
+                case token.LBRACE:
+                        node, err := p.objectType()
+                        if err != nil {
+                                return nil, err
+                        }
+
+                        l.Add(node)
+                case token.BOOL:
+                        // TODO(arslan) should we support? not supported by HCL yet
+                case token.LBRACK:
+                        // TODO(arslan) should we support nested lists? Even though it's
+                        // written in README of HCL, it's not a part of the grammar
+                        // (not defined in parse.y)
+                case token.RBRACK:
+                        // finished
+                        return l, nil
+                default:
+                        return nil, fmt.Errorf("unexpected token while parsing list: %s", tok.Type)
+                }
+
+        }
+}
+
+// literalType parses a literal type and returns a LiteralType AST
+func (p *Parser) literalType() (*ast.LiteralType, error) {
+        defer un(trace(p, "ParseLiteral"))
+
+        return &ast.LiteralType{
+                Token: p.tok.HCLToken(),
+        }, nil
+}
+
+// scan returns the next token from the underlying scanner. If a token has
+// been unscanned then read that instead.
+func (p *Parser) scan() token.Token {
+        // If we have a token on the buffer, then return it.
+        if p.n != 0 {
+                p.n = 0
+                return p.tok
+        }
+
+        p.tok = p.sc.Scan()
+        return p.tok
+}
+
+// unscan pushes the previously read token back onto the buffer.
+func (p *Parser) unscan() {
+        p.n = 1
+}
+
+// ----------------------------------------------------------------------------
+// Parsing support
+
+func (p *Parser) printTrace(a ...interface{}) {
+        if !p.enableTrace {
+                return
+        }
+
+        const dots = ". . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . "
+        const n = len(dots)
+        fmt.Printf("%5d:%3d: ", p.tok.Pos.Line, p.tok.Pos.Column)
+
+        i := 2 * p.indent
+        for i > n {
+                fmt.Print(dots)
+                i -= n
+        }
+        // i <= n
+        fmt.Print(dots[0:i])
+        fmt.Println(a...)
+}
+
+func trace(p *Parser, msg string) *Parser {
+        p.printTrace(msg, "(")
+        p.indent++
+        return p
+}
+
+// Usage pattern: defer un(trace(p, "..."))
+func un(p *Parser) {
+        p.indent--
+        p.printTrace(")")
+}