Checking in vendor folder for ease of using go get.

vendor/github.com/pelletier/go-toml/query/doc.go

@@ -0,0 +1,175 @@
+// Package query performs JSONPath-like queries on a TOML document.
+//
+// The query path implementation is based loosely on the JSONPath specification:
+// http://goessner.net/articles/JsonPath/.
+//
+// The idea behind a query path is to allow quick access to any element, or set
+// of elements within TOML document, with a single expression.
+//
+//   result, err := query.CompileAndExecute("$.foo.bar.baz", tree)
+//
+// This is roughly equivalent to:
+//
+//   next := tree.Get("foo")
+//   if next != nil {
+//     next = next.Get("bar")
+//     if next != nil {
+//       next = next.Get("baz")
+//     }
+//   }
+//   result := next
+//
+// err is nil if any parsing exception occurs.
+//
+// If no node in the tree matches the query, result will simply contain an empty list of
+// items.
+//
+// As illustrated above, the query path is much more efficient, especially since
+// the structure of the TOML file can vary.  Rather than making assumptions about
+// a document's structure, a query allows the programmer to make structured
+// requests into the document, and get zero or more values as a result.
+//
+// Query syntax
+//
+// The syntax of a query begins with a root token, followed by any number
+// sub-expressions:
+//
+//   $
+//                    Root of the TOML tree.  This must always come first.
+//   .name
+//                    Selects child of this node, where 'name' is a TOML key
+//                    name.
+//   ['name']
+//                    Selects child of this node, where 'name' is a string
+//                    containing a TOML key name.
+//   [index]
+//                    Selcts child array element at 'index'.
+//   ..expr
+//                    Recursively selects all children, filtered by an a union,
+//                    index, or slice expression.
+//   ..*
+//                    Recursive selection of all nodes at this point in the
+//                    tree.
+//   .*
+//                    Selects all children of the current node.
+//   [expr,expr]
+//                    Union operator - a logical 'or' grouping of two or more
+//                    sub-expressions: index, key name, or filter.
+//   [start:end:step]
+//                    Slice operator - selects array elements from start to
+//                    end-1, at the given step.  All three arguments are
+//                    optional.
+//   [?(filter)]
+//                    Named filter expression - the function 'filter' is
+//                    used to filter children at this node.
+//
+// Query Indexes And Slices
+//
+// Index expressions perform no bounds checking, and will contribute no
+// values to the result set if the provided index or index range is invalid.
+// Negative indexes represent values from the end of the array, counting backwards.
+//
+//   // select the last index of the array named 'foo'
+//   query.CompileAndExecute("$.foo[-1]", tree)
+//
+// Slice expressions are supported, by using ':' to separate a start/end index pair.
+//
+//   // select up to the first five elements in the array
+//   query.CompileAndExecute("$.foo[0:5]", tree)
+//
+// Slice expressions also allow negative indexes for the start and stop
+// arguments.
+//
+//   // select all array elements.
+//   query.CompileAndExecute("$.foo[0:-1]", tree)
+//
+// Slice expressions may have an optional stride/step parameter:
+//
+//   // select every other element
+//   query.CompileAndExecute("$.foo[0:-1:2]", tree)
+//
+// Slice start and end parameters are also optional:
+//
+//   // these are all equivalent and select all the values in the array
+//   query.CompileAndExecute("$.foo[:]", tree)
+//   query.CompileAndExecute("$.foo[0:]", tree)
+//   query.CompileAndExecute("$.foo[:-1]", tree)
+//   query.CompileAndExecute("$.foo[0:-1:]", tree)
+//   query.CompileAndExecute("$.foo[::1]", tree)
+//   query.CompileAndExecute("$.foo[0::1]", tree)
+//   query.CompileAndExecute("$.foo[:-1:1]", tree)
+//   query.CompileAndExecute("$.foo[0:-1:1]", tree)
+//
+// Query Filters
+//
+// Query filters are used within a Union [,] or single Filter [] expression.
+// A filter only allows nodes that qualify through to the next expression,
+// and/or into the result set.
+//
+//   // returns children of foo that are permitted by the 'bar' filter.
+//   query.CompileAndExecute("$.foo[?(bar)]", tree)
+//
+// There are several filters provided with the library:
+//
+//   tree
+//          Allows nodes of type Tree.
+//   int
+//          Allows nodes of type int64.
+//   float
+//          Allows nodes of type float64.
+//   string
+//          Allows nodes of type string.
+//   time
+//          Allows nodes of type time.Time.
+//   bool
+//          Allows nodes of type bool.
+//
+// Query Results
+//
+// An executed query returns a Result object.  This contains the nodes
+// in the TOML tree that qualify the query expression.  Position information
+// is also available for each value in the set.
+//
+//   // display the results of a query
+//   results := query.CompileAndExecute("$.foo.bar.baz", tree)
+//   for idx, value := results.Values() {
+//       fmt.Println("%v: %v", results.Positions()[idx], value)
+//   }
+//
+// Compiled Queries
+//
+// Queries may be executed directly on a Tree object, or compiled ahead
+// of time and executed discretely.  The former is more convenient, but has the
+// penalty of having to recompile the query expression each time.
+//
+//   // basic query
+//   results := query.CompileAndExecute("$.foo.bar.baz", tree)
+//
+//   // compiled query
+//   query, err := toml.Compile("$.foo.bar.baz")
+//   results := query.Execute(tree)
+//
+//   // run the compiled query again on a different tree
+//   moreResults := query.Execute(anotherTree)
+//
+// User Defined Query Filters
+//
+// Filter expressions may also be user defined by using the SetFilter()
+// function on the Query object.  The function must return true/false, which
+// signifies if the passed node is kept or discarded, respectively.
+//
+//   // create a query that references a user-defined filter
+//   query, _ := query.Compile("$[?(bazOnly)]")
+//
+//   // define the filter, and assign it to the query
+//   query.SetFilter("bazOnly", func(node interface{}) bool{
+//       if tree, ok := node.(*Tree); ok {
+//           return tree.Has("baz")
+//       }
+//       return false  // reject all other node types
+//   })
+//
+//   // run the query
+//   query.Execute(tree)
+//
+package query

vendor/github.com/pelletier/go-toml/query/lexer.go

@@ -0,0 +1,357 @@
+// TOML JSONPath lexer.
+//
+// Written using the principles developed by Rob Pike in
+// http://www.youtube.com/watch?v=HxaD_trXwRE
+
+package query
+
+import (
+	"fmt"
+	"github.com/pelletier/go-toml"
+	"strconv"
+	"strings"
+	"unicode/utf8"
+)
+
+// Lexer state function
+type queryLexStateFn func() queryLexStateFn
+
+// Lexer definition
+type queryLexer struct {
+	input      string
+	start      int
+	pos        int
+	width      int
+	tokens     chan token
+	depth      int
+	line       int
+	col        int
+	stringTerm string
+}
+
+func (l *queryLexer) run() {
+	for state := l.lexVoid; state != nil; {
+		state = state()
+	}
+	close(l.tokens)
+}
+
+func (l *queryLexer) nextStart() {
+	// iterate by runes (utf8 characters)
+	// search for newlines and advance line/col counts
+	for i := l.start; i < l.pos; {
+		r, width := utf8.DecodeRuneInString(l.input[i:])
+		if r == '\n' {
+			l.line++
+			l.col = 1
+		} else {
+			l.col++
+		}
+		i += width
+	}
+	// advance start position to next token
+	l.start = l.pos
+}
+
+func (l *queryLexer) emit(t tokenType) {
+	l.tokens <- token{
+		Position: toml.Position{Line: l.line, Col: l.col},
+		typ:      t,
+		val:      l.input[l.start:l.pos],
+	}
+	l.nextStart()
+}
+
+func (l *queryLexer) emitWithValue(t tokenType, value string) {
+	l.tokens <- token{
+		Position: toml.Position{Line: l.line, Col: l.col},
+		typ:      t,
+		val:      value,
+	}
+	l.nextStart()
+}
+
+func (l *queryLexer) next() rune {
+	if l.pos >= len(l.input) {
+		l.width = 0
+		return eof
+	}
+	var r rune
+	r, l.width = utf8.DecodeRuneInString(l.input[l.pos:])
+	l.pos += l.width
+	return r
+}
+
+func (l *queryLexer) ignore() {
+	l.nextStart()
+}
+
+func (l *queryLexer) backup() {
+	l.pos -= l.width
+}
+
+func (l *queryLexer) errorf(format string, args ...interface{}) queryLexStateFn {
+	l.tokens <- token{
+		Position: toml.Position{Line: l.line, Col: l.col},
+		typ:      tokenError,
+		val:      fmt.Sprintf(format, args...),
+	}
+	return nil
+}
+
+func (l *queryLexer) peek() rune {
+	r := l.next()
+	l.backup()
+	return r
+}
+
+func (l *queryLexer) accept(valid string) bool {
+	if strings.ContainsRune(valid, l.next()) {
+		return true
+	}
+	l.backup()
+	return false
+}
+
+func (l *queryLexer) follow(next string) bool {
+	return strings.HasPrefix(l.input[l.pos:], next)
+}
+
+func (l *queryLexer) lexVoid() queryLexStateFn {
+	for {
+		next := l.peek()
+		switch next {
+		case '$':
+			l.pos++
+			l.emit(tokenDollar)
+			continue
+		case '.':
+			if l.follow("..") {
+				l.pos += 2
+				l.emit(tokenDotDot)
+			} else {
+				l.pos++
+				l.emit(tokenDot)
+			}
+			continue
+		case '[':
+			l.pos++
+			l.emit(tokenLeftBracket)
+			continue
+		case ']':
+			l.pos++
+			l.emit(tokenRightBracket)
+			continue
+		case ',':
+			l.pos++
+			l.emit(tokenComma)
+			continue
+		case '*':
+			l.pos++
+			l.emit(tokenStar)
+			continue
+		case '(':
+			l.pos++
+			l.emit(tokenLeftParen)
+			continue
+		case ')':
+			l.pos++
+			l.emit(tokenRightParen)
+			continue
+		case '?':
+			l.pos++
+			l.emit(tokenQuestion)
+			continue
+		case ':':
+			l.pos++
+			l.emit(tokenColon)
+			continue
+		case '\'':
+			l.ignore()
+			l.stringTerm = string(next)
+			return l.lexString
+		case '"':
+			l.ignore()
+			l.stringTerm = string(next)
+			return l.lexString
+		}
+
+		if isSpace(next) {
+			l.next()
+			l.ignore()
+			continue
+		}
+
+		if isAlphanumeric(next) {
+			return l.lexKey
+		}
+
+		if next == '+' || next == '-' || isDigit(next) {
+			return l.lexNumber
+		}
+
+		if l.next() == eof {
+			break
+		}
+
+		return l.errorf("unexpected char: '%v'", next)
+	}
+	l.emit(tokenEOF)
+	return nil
+}
+
+func (l *queryLexer) lexKey() queryLexStateFn {
+	for {
+		next := l.peek()
+		if !isAlphanumeric(next) {
+			l.emit(tokenKey)
+			return l.lexVoid
+		}
+
+		if l.next() == eof {
+			break
+		}
+	}
+	l.emit(tokenEOF)
+	return nil
+}
+
+func (l *queryLexer) lexString() queryLexStateFn {
+	l.pos++
+	l.ignore()
+	growingString := ""
+
+	for {
+		if l.follow(l.stringTerm) {
+			l.emitWithValue(tokenString, growingString)
+			l.pos++
+			l.ignore()
+			return l.lexVoid
+		}
+
+		if l.follow("\\\"") {
+			l.pos++
+			growingString += "\""
+		} else if l.follow("\\'") {
+			l.pos++
+			growingString += "'"
+		} else if l.follow("\\n") {
+			l.pos++
+			growingString += "\n"
+		} else if l.follow("\\b") {
+			l.pos++
+			growingString += "\b"
+		} else if l.follow("\\f") {
+			l.pos++
+			growingString += "\f"
+		} else if l.follow("\\/") {
+			l.pos++
+			growingString += "/"
+		} else if l.follow("\\t") {
+			l.pos++
+			growingString += "\t"
+		} else if l.follow("\\r") {
+			l.pos++
+			growingString += "\r"
+		} else if l.follow("\\\\") {
+			l.pos++
+			growingString += "\\"
+		} else if l.follow("\\u") {
+			l.pos += 2
+			code := ""
+			for i := 0; i < 4; i++ {
+				c := l.peek()
+				l.pos++
+				if !isHexDigit(c) {
+					return l.errorf("unfinished unicode escape")
+				}
+				code = code + string(c)
+			}
+			l.pos--
+			intcode, err := strconv.ParseInt(code, 16, 32)
+			if err != nil {
+				return l.errorf("invalid unicode escape: \\u" + code)
+			}
+			growingString += string(rune(intcode))
+		} else if l.follow("\\U") {
+			l.pos += 2
+			code := ""
+			for i := 0; i < 8; i++ {
+				c := l.peek()
+				l.pos++
+				if !isHexDigit(c) {
+					return l.errorf("unfinished unicode escape")
+				}
+				code = code + string(c)
+			}
+			l.pos--
+			intcode, err := strconv.ParseInt(code, 16, 32)
+			if err != nil {
+				return l.errorf("invalid unicode escape: \\u" + code)
+			}
+			growingString += string(rune(intcode))
+		} else if l.follow("\\") {
+			l.pos++
+			return l.errorf("invalid escape sequence: \\" + string(l.peek()))
+		} else {
+			growingString += string(l.peek())
+		}
+
+		if l.next() == eof {
+			break
+		}
+	}
+
+	return l.errorf("unclosed string")
+}
+
+func (l *queryLexer) lexNumber() queryLexStateFn {
+	l.ignore()
+	if !l.accept("+") {
+		l.accept("-")
+	}
+	pointSeen := false
+	digitSeen := false
+	for {
+		next := l.next()
+		if next == '.' {
+			if pointSeen {
+				return l.errorf("cannot have two dots in one float")
+			}
+			if !isDigit(l.peek()) {
+				return l.errorf("float cannot end with a dot")
+			}
+			pointSeen = true
+		} else if isDigit(next) {
+			digitSeen = true
+		} else {
+			l.backup()
+			break
+		}
+		if pointSeen && !digitSeen {
+			return l.errorf("cannot start float with a dot")
+		}
+	}
+
+	if !digitSeen {
+		return l.errorf("no digit in that number")
+	}
+	if pointSeen {
+		l.emit(tokenFloat)
+	} else {
+		l.emit(tokenInteger)
+	}
+	return l.lexVoid
+}
+
+// Entry point
+func lexQuery(input string) chan token {
+	l := &queryLexer{
+		input:  input,
+		tokens: make(chan token),
+		line:   1,
+		col:    1,
+	}
+	go l.run()
+	return l.tokens
+}

vendor/github.com/pelletier/go-toml/query/lexer_test.go

@@ -0,0 +1,179 @@
+package query
+
+import (
+	"github.com/pelletier/go-toml"
+	"testing"
+)
+
+func testQLFlow(t *testing.T, input string, expectedFlow []token) {
+	ch := lexQuery(input)
+	for idx, expected := range expectedFlow {
+		token := <-ch
+		if token != expected {
+			t.Log("While testing #", idx, ":", input)
+			t.Log("compared (got)", token, "to (expected)", expected)
+			t.Log("\tvalue:", token.val, "<->", expected.val)
+			t.Log("\tvalue as bytes:", []byte(token.val), "<->", []byte(expected.val))
+			t.Log("\ttype:", token.typ.String(), "<->", expected.typ.String())
+			t.Log("\tline:", token.Line, "<->", expected.Line)
+			t.Log("\tcolumn:", token.Col, "<->", expected.Col)
+			t.Log("compared", token, "to", expected)
+			t.FailNow()
+		}
+	}
+
+	tok, ok := <-ch
+	if ok {
+		t.Log("channel is not closed!")
+		t.Log(len(ch)+1, "tokens remaining:")
+
+		t.Log("token ->", tok)
+		for token := range ch {
+			t.Log("token ->", token)
+		}
+		t.FailNow()
+	}
+}
+
+func TestLexSpecialChars(t *testing.T) {
+	testQLFlow(t, " .$[]..()?*", []token{
+		{toml.Position{1, 2}, tokenDot, "."},
+		{toml.Position{1, 3}, tokenDollar, "$"},
+		{toml.Position{1, 4}, tokenLeftBracket, "["},
+		{toml.Position{1, 5}, tokenRightBracket, "]"},
+		{toml.Position{1, 6}, tokenDotDot, ".."},
+		{toml.Position{1, 8}, tokenLeftParen, "("},
+		{toml.Position{1, 9}, tokenRightParen, ")"},
+		{toml.Position{1, 10}, tokenQuestion, "?"},
+		{toml.Position{1, 11}, tokenStar, "*"},
+		{toml.Position{1, 12}, tokenEOF, ""},
+	})
+}
+
+func TestLexString(t *testing.T) {
+	testQLFlow(t, "'foo\n'", []token{
+		{toml.Position{1, 2}, tokenString, "foo\n"},
+		{toml.Position{2, 2}, tokenEOF, ""},
+	})
+}
+
+func TestLexDoubleString(t *testing.T) {
+	testQLFlow(t, `"bar"`, []token{
+		{toml.Position{1, 2}, tokenString, "bar"},
+		{toml.Position{1, 6}, tokenEOF, ""},
+	})
+}
+
+func TestLexStringEscapes(t *testing.T) {
+	testQLFlow(t, `"foo \" \' \b \f \/ \t \r \\ \u03A9 \U00012345 \n bar"`, []token{
+		{toml.Position{1, 2}, tokenString, "foo \" ' \b \f / \t \r \\ \u03A9 \U00012345 \n bar"},
+		{toml.Position{1, 55}, tokenEOF, ""},
+	})
+}
+
+func TestLexStringUnfinishedUnicode4(t *testing.T) {
+	testQLFlow(t, `"\u000"`, []token{
+		{toml.Position{1, 2}, tokenError, "unfinished unicode escape"},
+	})
+}
+
+func TestLexStringUnfinishedUnicode8(t *testing.T) {
+	testQLFlow(t, `"\U0000"`, []token{
+		{toml.Position{1, 2}, tokenError, "unfinished unicode escape"},
+	})
+}
+
+func TestLexStringInvalidEscape(t *testing.T) {
+	testQLFlow(t, `"\x"`, []token{
+		{toml.Position{1, 2}, tokenError, "invalid escape sequence: \\x"},
+	})
+}
+
+func TestLexStringUnfinished(t *testing.T) {
+	testQLFlow(t, `"bar`, []token{
+		{toml.Position{1, 2}, tokenError, "unclosed string"},
+	})
+}
+
+func TestLexKey(t *testing.T) {
+	testQLFlow(t, "foo", []token{
+		{toml.Position{1, 1}, tokenKey, "foo"},
+		{toml.Position{1, 4}, tokenEOF, ""},
+	})
+}
+
+func TestLexRecurse(t *testing.T) {
+	testQLFlow(t, "$..*", []token{
+		{toml.Position{1, 1}, tokenDollar, "$"},
+		{toml.Position{1, 2}, tokenDotDot, ".."},
+		{toml.Position{1, 4}, tokenStar, "*"},
+		{toml.Position{1, 5}, tokenEOF, ""},
+	})
+}
+
+func TestLexBracketKey(t *testing.T) {
+	testQLFlow(t, "$[foo]", []token{
+		{toml.Position{1, 1}, tokenDollar, "$"},
+		{toml.Position{1, 2}, tokenLeftBracket, "["},
+		{toml.Position{1, 3}, tokenKey, "foo"},
+		{toml.Position{1, 6}, tokenRightBracket, "]"},
+		{toml.Position{1, 7}, tokenEOF, ""},
+	})
+}
+
+func TestLexSpace(t *testing.T) {
+	testQLFlow(t, "foo bar baz", []token{
+		{toml.Position{1, 1}, tokenKey, "foo"},
+		{toml.Position{1, 5}, tokenKey, "bar"},
+		{toml.Position{1, 9}, tokenKey, "baz"},
+		{toml.Position{1, 12}, tokenEOF, ""},
+	})
+}
+
+func TestLexInteger(t *testing.T) {
+	testQLFlow(t, "100 +200 -300", []token{
+		{toml.Position{1, 1}, tokenInteger, "100"},
+		{toml.Position{1, 5}, tokenInteger, "+200"},
+		{toml.Position{1, 10}, tokenInteger, "-300"},
+		{toml.Position{1, 14}, tokenEOF, ""},
+	})
+}
+
+func TestLexFloat(t *testing.T) {
+	testQLFlow(t, "100.0 +200.0 -300.0", []token{
+		{toml.Position{1, 1}, tokenFloat, "100.0"},
+		{toml.Position{1, 7}, tokenFloat, "+200.0"},
+		{toml.Position{1, 14}, tokenFloat, "-300.0"},
+		{toml.Position{1, 20}, tokenEOF, ""},
+	})
+}
+
+func TestLexFloatWithMultipleDots(t *testing.T) {
+	testQLFlow(t, "4.2.", []token{
+		{toml.Position{1, 1}, tokenError, "cannot have two dots in one float"},
+	})
+}
+
+func TestLexFloatLeadingDot(t *testing.T) {
+	testQLFlow(t, "+.1", []token{
+		{toml.Position{1, 1}, tokenError, "cannot start float with a dot"},
+	})
+}
+
+func TestLexFloatWithTrailingDot(t *testing.T) {
+	testQLFlow(t, "42.", []token{
+		{toml.Position{1, 1}, tokenError, "float cannot end with a dot"},
+	})
+}
+
+func TestLexNumberWithoutDigit(t *testing.T) {
+	testQLFlow(t, "+", []token{
+		{toml.Position{1, 1}, tokenError, "no digit in that number"},
+	})
+}
+
+func TestLexUnknown(t *testing.T) {
+	testQLFlow(t, "^", []token{
+		{toml.Position{1, 1}, tokenError, "unexpected char: '94'"},
+	})
+}

vendor/github.com/pelletier/go-toml/query/match.go

@@ -0,0 +1,232 @@
+package query
+
+import (
+	"fmt"
+	"github.com/pelletier/go-toml"
+)
+
+// base match
+type matchBase struct {
+	next pathFn
+}
+
+func (f *matchBase) setNext(next pathFn) {
+	f.next = next
+}
+
+// terminating functor - gathers results
+type terminatingFn struct {
+	// empty
+}
+
+func newTerminatingFn() *terminatingFn {
+	return &terminatingFn{}
+}
+
+func (f *terminatingFn) setNext(next pathFn) {
+	// do nothing
+}
+
+func (f *terminatingFn) call(node interface{}, ctx *queryContext) {
+	ctx.result.appendResult(node, ctx.lastPosition)
+}
+
+// match single key
+type matchKeyFn struct {
+	matchBase
+	Name string
+}
+
+func newMatchKeyFn(name string) *matchKeyFn {
+	return &matchKeyFn{Name: name}
+}
+
+func (f *matchKeyFn) call(node interface{}, ctx *queryContext) {
+	if array, ok := node.([]*toml.Tree); ok {
+		for _, tree := range array {
+			item := tree.Get(f.Name)
+			if item != nil {
+				ctx.lastPosition = tree.GetPosition(f.Name)
+				f.next.call(item, ctx)
+			}
+		}
+	} else if tree, ok := node.(*toml.Tree); ok {
+		item := tree.Get(f.Name)
+		if item != nil {
+			ctx.lastPosition = tree.GetPosition(f.Name)
+			f.next.call(item, ctx)
+		}
+	}
+}
+
+// match single index
+type matchIndexFn struct {
+	matchBase
+	Idx int
+}
+
+func newMatchIndexFn(idx int) *matchIndexFn {
+	return &matchIndexFn{Idx: idx}
+}
+
+func (f *matchIndexFn) call(node interface{}, ctx *queryContext) {
+	if arr, ok := node.([]interface{}); ok {
+		if f.Idx < len(arr) && f.Idx >= 0 {
+			if treesArray, ok := node.([]*toml.Tree); ok {
+				if len(treesArray) > 0 {
+					ctx.lastPosition = treesArray[0].Position()
+				}
+			}
+			f.next.call(arr[f.Idx], ctx)
+		}
+	}
+}
+
+// filter by slicing
+type matchSliceFn struct {
+	matchBase
+	Start, End, Step int
+}
+
+func newMatchSliceFn(start, end, step int) *matchSliceFn {
+	return &matchSliceFn{Start: start, End: end, Step: step}
+}
+
+func (f *matchSliceFn) call(node interface{}, ctx *queryContext) {
+	if arr, ok := node.([]interface{}); ok {
+		// adjust indexes for negative values, reverse ordering
+		realStart, realEnd := f.Start, f.End
+		if realStart < 0 {
+			realStart = len(arr) + realStart
+		}
+		if realEnd < 0 {
+			realEnd = len(arr) + realEnd
+		}
+		if realEnd < realStart {
+			realEnd, realStart = realStart, realEnd // swap
+		}
+		// loop and gather
+		for idx := realStart; idx < realEnd; idx += f.Step {
+			if treesArray, ok := node.([]*toml.Tree); ok {
+				if len(treesArray) > 0 {
+					ctx.lastPosition = treesArray[0].Position()
+				}
+			}
+			f.next.call(arr[idx], ctx)
+		}
+	}
+}
+
+// match anything
+type matchAnyFn struct {
+	matchBase
+}
+
+func newMatchAnyFn() *matchAnyFn {
+	return &matchAnyFn{}
+}
+
+func (f *matchAnyFn) call(node interface{}, ctx *queryContext) {
+	if tree, ok := node.(*toml.Tree); ok {
+		for _, k := range tree.Keys() {
+			v := tree.Get(k)
+			ctx.lastPosition = tree.GetPosition(k)
+			f.next.call(v, ctx)
+		}
+	}
+}
+
+// filter through union
+type matchUnionFn struct {
+	Union []pathFn
+}
+
+func (f *matchUnionFn) setNext(next pathFn) {
+	for _, fn := range f.Union {
+		fn.setNext(next)
+	}
+}
+
+func (f *matchUnionFn) call(node interface{}, ctx *queryContext) {
+	for _, fn := range f.Union {
+		fn.call(node, ctx)
+	}
+}
+
+// match every single last node in the tree
+type matchRecursiveFn struct {
+	matchBase
+}
+
+func newMatchRecursiveFn() *matchRecursiveFn {
+	return &matchRecursiveFn{}
+}
+
+func (f *matchRecursiveFn) call(node interface{}, ctx *queryContext) {
+	originalPosition := ctx.lastPosition
+	if tree, ok := node.(*toml.Tree); ok {
+		var visit func(tree *toml.Tree)
+		visit = func(tree *toml.Tree) {
+			for _, k := range tree.Keys() {
+				v := tree.Get(k)
+				ctx.lastPosition = tree.GetPosition(k)
+				f.next.call(v, ctx)
+				switch node := v.(type) {
+				case *toml.Tree:
+					visit(node)
+				case []*toml.Tree:
+					for _, subtree := range node {
+						visit(subtree)
+					}
+				}
+			}
+		}
+		ctx.lastPosition = originalPosition
+		f.next.call(tree, ctx)
+		visit(tree)
+	}
+}
+
+// match based on an externally provided functional filter
+type matchFilterFn struct {
+	matchBase
+	Pos  toml.Position
+	Name string
+}
+
+func newMatchFilterFn(name string, pos toml.Position) *matchFilterFn {
+	return &matchFilterFn{Name: name, Pos: pos}
+}
+
+func (f *matchFilterFn) call(node interface{}, ctx *queryContext) {
+	fn, ok := (*ctx.filters)[f.Name]
+	if !ok {
+		panic(fmt.Sprintf("%s: query context does not have filter '%s'",
+			f.Pos.String(), f.Name))
+	}
+	switch castNode := node.(type) {
+	case *toml.Tree:
+		for _, k := range castNode.Keys() {
+			v := castNode.Get(k)
+			if fn(v) {
+				ctx.lastPosition = castNode.GetPosition(k)
+				f.next.call(v, ctx)
+			}
+		}
+	case []*toml.Tree:
+		for _, v := range castNode {
+			if fn(v) {
+				if len(castNode) > 0 {
+					ctx.lastPosition = castNode[0].Position()
+				}
+				f.next.call(v, ctx)
+			}
+		}
+	case []interface{}:
+		for _, v := range castNode {
+			if fn(v) {
+				f.next.call(v, ctx)
+			}
+		}
+	}
+}

vendor/github.com/pelletier/go-toml/query/match_test.go

@@ -0,0 +1,202 @@
+package query
+
+import (
+	"fmt"
+	"github.com/pelletier/go-toml"
+	"testing"
+)
+
+// dump path tree to a string
+func pathString(root pathFn) string {
+	result := fmt.Sprintf("%T:", root)
+	switch fn := root.(type) {
+	case *terminatingFn:
+		result += "{}"
+	case *matchKeyFn:
+		result += fmt.Sprintf("{%s}", fn.Name)
+		result += pathString(fn.next)
+	case *matchIndexFn:
+		result += fmt.Sprintf("{%d}", fn.Idx)
+		result += pathString(fn.next)
+	case *matchSliceFn:
+		result += fmt.Sprintf("{%d:%d:%d}",
+			fn.Start, fn.End, fn.Step)
+		result += pathString(fn.next)
+	case *matchAnyFn:
+		result += "{}"
+		result += pathString(fn.next)
+	case *matchUnionFn:
+		result += "{["
+		for _, v := range fn.Union {
+			result += pathString(v) + ", "
+		}
+		result += "]}"
+	case *matchRecursiveFn:
+		result += "{}"
+		result += pathString(fn.next)
+	case *matchFilterFn:
+		result += fmt.Sprintf("{%s}", fn.Name)
+		result += pathString(fn.next)
+	}
+	return result
+}
+
+func assertPathMatch(t *testing.T, path, ref *Query) bool {
+	pathStr := pathString(path.root)
+	refStr := pathString(ref.root)
+	if pathStr != refStr {
+		t.Errorf("paths do not match")
+		t.Log("test:", pathStr)
+		t.Log("ref: ", refStr)
+		return false
+	}
+	return true
+}
+
+func assertPath(t *testing.T, query string, ref *Query) {
+	path, _ := parseQuery(lexQuery(query))
+	assertPathMatch(t, path, ref)
+}
+
+func buildPath(parts ...pathFn) *Query {
+	query := newQuery()
+	for _, v := range parts {
+		query.appendPath(v)
+	}
+	return query
+}
+
+func TestPathRoot(t *testing.T) {
+	assertPath(t,
+		"$",
+		buildPath(
+		// empty
+		))
+}
+
+func TestPathKey(t *testing.T) {
+	assertPath(t,
+		"$.foo",
+		buildPath(
+			newMatchKeyFn("foo"),
+		))
+}
+
+func TestPathBracketKey(t *testing.T) {
+	assertPath(t,
+		"$[foo]",
+		buildPath(
+			newMatchKeyFn("foo"),
+		))
+}
+
+func TestPathBracketStringKey(t *testing.T) {
+	assertPath(t,
+		"$['foo']",
+		buildPath(
+			newMatchKeyFn("foo"),
+		))
+}
+
+func TestPathIndex(t *testing.T) {
+	assertPath(t,
+		"$[123]",
+		buildPath(
+			newMatchIndexFn(123),
+		))
+}
+
+func TestPathSliceStart(t *testing.T) {
+	assertPath(t,
+		"$[123:]",
+		buildPath(
+			newMatchSliceFn(123, maxInt, 1),
+		))
+}
+
+func TestPathSliceStartEnd(t *testing.T) {
+	assertPath(t,
+		"$[123:456]",
+		buildPath(
+			newMatchSliceFn(123, 456, 1),
+		))
+}
+
+func TestPathSliceStartEndColon(t *testing.T) {
+	assertPath(t,
+		"$[123:456:]",
+		buildPath(
+			newMatchSliceFn(123, 456, 1),
+		))
+}
+
+func TestPathSliceStartStep(t *testing.T) {
+	assertPath(t,
+		"$[123::7]",
+		buildPath(
+			newMatchSliceFn(123, maxInt, 7),
+		))
+}
+
+func TestPathSliceEndStep(t *testing.T) {
+	assertPath(t,
+		"$[:456:7]",
+		buildPath(
+			newMatchSliceFn(0, 456, 7),
+		))
+}
+
+func TestPathSliceStep(t *testing.T) {
+	assertPath(t,
+		"$[::7]",
+		buildPath(
+			newMatchSliceFn(0, maxInt, 7),
+		))
+}
+
+func TestPathSliceAll(t *testing.T) {
+	assertPath(t,
+		"$[123:456:7]",
+		buildPath(
+			newMatchSliceFn(123, 456, 7),
+		))
+}
+
+func TestPathAny(t *testing.T) {
+	assertPath(t,
+		"$.*",
+		buildPath(
+			newMatchAnyFn(),
+		))
+}
+
+func TestPathUnion(t *testing.T) {
+	assertPath(t,
+		"$[foo, bar, baz]",
+		buildPath(
+			&matchUnionFn{[]pathFn{
+				newMatchKeyFn("foo"),
+				newMatchKeyFn("bar"),
+				newMatchKeyFn("baz"),
+			}},
+		))
+}
+
+func TestPathRecurse(t *testing.T) {
+	assertPath(t,
+		"$..*",
+		buildPath(
+			newMatchRecursiveFn(),
+		))
+}
+
+func TestPathFilterExpr(t *testing.T) {
+	assertPath(t,
+		"$[?('foo'),?(bar)]",
+		buildPath(
+			&matchUnionFn{[]pathFn{
+				newMatchFilterFn("foo", toml.Position{}),
+				newMatchFilterFn("bar", toml.Position{}),
+			}},
+		))
+}

vendor/github.com/pelletier/go-toml/query/parser.go

@@ -0,0 +1,275 @@
+/*
+  Based on the "jsonpath" spec/concept.
+
+  http://goessner.net/articles/JsonPath/
+  https://code.google.com/p/json-path/
+*/
+
+package query
+
+import (
+	"fmt"
+)
+
+const maxInt = int(^uint(0) >> 1)
+
+type queryParser struct {
+	flow         chan token
+	tokensBuffer []token
+	query        *Query
+	union        []pathFn
+	err          error
+}
+
+type queryParserStateFn func() queryParserStateFn
+
+// Formats and panics an error message based on a token
+func (p *queryParser) parseError(tok *token, msg string, args ...interface{}) queryParserStateFn {
+	p.err = fmt.Errorf(tok.Position.String()+": "+msg, args...)
+	return nil // trigger parse to end
+}
+
+func (p *queryParser) run() {
+	for state := p.parseStart; state != nil; {
+		state = state()
+	}
+}
+
+func (p *queryParser) backup(tok *token) {
+	p.tokensBuffer = append(p.tokensBuffer, *tok)
+}
+
+func (p *queryParser) peek() *token {
+	if len(p.tokensBuffer) != 0 {
+		return &(p.tokensBuffer[0])
+	}
+
+	tok, ok := <-p.flow
+	if !ok {
+		return nil
+	}
+	p.backup(&tok)
+	return &tok
+}
+
+func (p *queryParser) lookahead(types ...tokenType) bool {
+	result := true
+	buffer := []token{}
+
+	for _, typ := range types {
+		tok := p.getToken()
+		if tok == nil {
+			result = false
+			break
+		}
+		buffer = append(buffer, *tok)
+		if tok.typ != typ {
+			result = false
+			break
+		}
+	}
+	// add the tokens back to the buffer, and return
+	p.tokensBuffer = append(p.tokensBuffer, buffer...)
+	return result
+}
+
+func (p *queryParser) getToken() *token {
+	if len(p.tokensBuffer) != 0 {
+		tok := p.tokensBuffer[0]
+		p.tokensBuffer = p.tokensBuffer[1:]
+		return &tok
+	}
+	tok, ok := <-p.flow
+	if !ok {
+		return nil
+	}
+	return &tok
+}
+
+func (p *queryParser) parseStart() queryParserStateFn {
+	tok := p.getToken()
+
+	if tok == nil || tok.typ == tokenEOF {
+		return nil
+	}
+
+	if tok.typ != tokenDollar {
+		return p.parseError(tok, "Expected '$' at start of expression")
+	}
+
+	return p.parseMatchExpr
+}
+
+// handle '.' prefix, '[]', and '..'
+func (p *queryParser) parseMatchExpr() queryParserStateFn {
+	tok := p.getToken()
+	switch tok.typ {
+	case tokenDotDot:
+		p.query.appendPath(&matchRecursiveFn{})
+		// nested parse for '..'
+		tok := p.getToken()
+		switch tok.typ {
+		case tokenKey:
+			p.query.appendPath(newMatchKeyFn(tok.val))
+			return p.parseMatchExpr
+		case tokenLeftBracket:
+			return p.parseBracketExpr
+		case tokenStar:
+			// do nothing - the recursive predicate is enough
+			return p.parseMatchExpr
+		}
+
+	case tokenDot:
+		// nested parse for '.'
+		tok := p.getToken()
+		switch tok.typ {
+		case tokenKey:
+			p.query.appendPath(newMatchKeyFn(tok.val))
+			return p.parseMatchExpr
+		case tokenStar:
+			p.query.appendPath(&matchAnyFn{})
+			return p.parseMatchExpr
+		}
+
+	case tokenLeftBracket:
+		return p.parseBracketExpr
+
+	case tokenEOF:
+		return nil // allow EOF at this stage
+	}
+	return p.parseError(tok, "expected match expression")
+}
+
+func (p *queryParser) parseBracketExpr() queryParserStateFn {
+	if p.lookahead(tokenInteger, tokenColon) {
+		return p.parseSliceExpr
+	}
+	if p.peek().typ == tokenColon {
+		return p.parseSliceExpr
+	}
+	return p.parseUnionExpr
+}
+
+func (p *queryParser) parseUnionExpr() queryParserStateFn {
+	var tok *token
+
+	// this state can be traversed after some sub-expressions
+	// so be careful when setting up state in the parser
+	if p.union == nil {
+		p.union = []pathFn{}
+	}
+
+loop: // labeled loop for easy breaking
+	for {
+		if len(p.union) > 0 {
+			// parse delimiter or terminator
+			tok = p.getToken()
+			switch tok.typ {
+			case tokenComma:
+				// do nothing
+			case tokenRightBracket:
+				break loop
+			default:
+				return p.parseError(tok, "expected ',' or ']', not '%s'", tok.val)
+			}
+		}
+
+		// parse sub expression
+		tok = p.getToken()
+		switch tok.typ {
+		case tokenInteger:
+			p.union = append(p.union, newMatchIndexFn(tok.Int()))
+		case tokenKey:
+			p.union = append(p.union, newMatchKeyFn(tok.val))
+		case tokenString:
+			p.union = append(p.union, newMatchKeyFn(tok.val))
+		case tokenQuestion:
+			return p.parseFilterExpr
+		default:
+			return p.parseError(tok, "expected union sub expression, not '%s', %d", tok.val, len(p.union))
+		}
+	}
+
+	// if there is only one sub-expression, use that instead
+	if len(p.union) == 1 {
+		p.query.appendPath(p.union[0])
+	} else {
+		p.query.appendPath(&matchUnionFn{p.union})
+	}
+
+	p.union = nil // clear out state
+	return p.parseMatchExpr
+}
+
+func (p *queryParser) parseSliceExpr() queryParserStateFn {
+	// init slice to grab all elements
+	start, end, step := 0, maxInt, 1
+
+	// parse optional start
+	tok := p.getToken()
+	if tok.typ == tokenInteger {
+		start = tok.Int()
+		tok = p.getToken()
+	}
+	if tok.typ != tokenColon {
+		return p.parseError(tok, "expected ':'")
+	}
+
+	// parse optional end
+	tok = p.getToken()
+	if tok.typ == tokenInteger {
+		end = tok.Int()
+		tok = p.getToken()
+	}
+	if tok.typ == tokenRightBracket {
+		p.query.appendPath(newMatchSliceFn(start, end, step))
+		return p.parseMatchExpr
+	}
+	if tok.typ != tokenColon {
+		return p.parseError(tok, "expected ']' or ':'")
+	}
+
+	// parse optional step
+	tok = p.getToken()
+	if tok.typ == tokenInteger {
+		step = tok.Int()
+		if step < 0 {
+			return p.parseError(tok, "step must be a positive value")
+		}
+		tok = p.getToken()
+	}
+	if tok.typ != tokenRightBracket {
+		return p.parseError(tok, "expected ']'")
+	}
+
+	p.query.appendPath(newMatchSliceFn(start, end, step))
+	return p.parseMatchExpr
+}
+
+func (p *queryParser) parseFilterExpr() queryParserStateFn {
+	tok := p.getToken()
+	if tok.typ != tokenLeftParen {
+		return p.parseError(tok, "expected left-parenthesis for filter expression")
+	}
+	tok = p.getToken()
+	if tok.typ != tokenKey && tok.typ != tokenString {
+		return p.parseError(tok, "expected key or string for filter function name")
+	}
+	name := tok.val
+	tok = p.getToken()
+	if tok.typ != tokenRightParen {
+		return p.parseError(tok, "expected right-parenthesis for filter expression")
+	}
+	p.union = append(p.union, newMatchFilterFn(name, tok.Position))
+	return p.parseUnionExpr
+}
+
+func parseQuery(flow chan token) (*Query, error) {
+	parser := &queryParser{
+		flow:         flow,
+		tokensBuffer: []token{},
+		query:        newQuery(),
+	}
+	parser.run()
+	return parser.query, parser.err
+}

vendor/github.com/pelletier/go-toml/query/parser_test.go

@@ -0,0 +1,482 @@
+package query
+
+import (
+	"fmt"
+	"io/ioutil"
+	"sort"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/pelletier/go-toml"
+)
+
+type queryTestNode struct {
+	value    interface{}
+	position toml.Position
+}
+
+func valueString(root interface{}) string {
+	result := "" //fmt.Sprintf("%T:", root)
+	switch node := root.(type) {
+	case *Result:
+		items := []string{}
+		for i, v := range node.Values() {
+			items = append(items, fmt.Sprintf("%s:%s",
+				node.Positions()[i].String(), valueString(v)))
+		}
+		sort.Strings(items)
+		result = "[" + strings.Join(items, ", ") + "]"
+	case queryTestNode:
+		result = fmt.Sprintf("%s:%s",
+			node.position.String(), valueString(node.value))
+	case []interface{}:
+		items := []string{}
+		for _, v := range node {
+			items = append(items, valueString(v))
+		}
+		sort.Strings(items)
+		result = "[" + strings.Join(items, ", ") + "]"
+	case *toml.Tree:
+		// workaround for unreliable map key ordering
+		items := []string{}
+		for _, k := range node.Keys() {
+			v := node.GetPath([]string{k})
+			items = append(items, k+":"+valueString(v))
+		}
+		sort.Strings(items)
+		result = "{" + strings.Join(items, ", ") + "}"
+	case map[string]interface{}:
+		// workaround for unreliable map key ordering
+		items := []string{}
+		for k, v := range node {
+			items = append(items, k+":"+valueString(v))
+		}
+		sort.Strings(items)
+		result = "{" + strings.Join(items, ", ") + "}"
+	case int64:
+		result += fmt.Sprintf("%d", node)
+	case string:
+		result += "'" + node + "'"
+	case float64:
+		result += fmt.Sprintf("%f", node)
+	case bool:
+		result += fmt.Sprintf("%t", node)
+	case time.Time:
+		result += fmt.Sprintf("'%v'", node)
+	}
+	return result
+}
+
+func assertValue(t *testing.T, result, ref interface{}) {
+	pathStr := valueString(result)
+	refStr := valueString(ref)
+	if pathStr != refStr {
+		t.Errorf("values do not match")
+		t.Log("test:", pathStr)
+		t.Log("ref: ", refStr)
+	}
+}
+
+func assertQueryPositions(t *testing.T, tomlDoc string, query string, ref []interface{}) {
+	tree, err := toml.Load(tomlDoc)
+	if err != nil {
+		t.Errorf("Non-nil toml parse error: %v", err)
+		return
+	}
+	q, err := Compile(query)
+	if err != nil {
+		t.Error(err)
+		return
+	}
+	results := q.Execute(tree)
+	assertValue(t, results, ref)
+}
+
+func TestQueryRoot(t *testing.T) {
+	assertQueryPositions(t,
+		"a = 42",
+		"$",
+		[]interface{}{
+			queryTestNode{
+				map[string]interface{}{
+					"a": int64(42),
+				}, toml.Position{1, 1},
+			},
+		})
+}
+
+func TestQueryKey(t *testing.T) {
+	assertQueryPositions(t,
+		"[foo]\na = 42",
+		"$.foo.a",
+		[]interface{}{
+			queryTestNode{
+				int64(42), toml.Position{2, 1},
+			},
+		})
+}
+
+func TestQueryKeyString(t *testing.T) {
+	assertQueryPositions(t,
+		"[foo]\na = 42",
+		"$.foo['a']",
+		[]interface{}{
+			queryTestNode{
+				int64(42), toml.Position{2, 1},
+			},
+		})
+}
+
+func TestQueryIndex(t *testing.T) {
+	assertQueryPositions(t,
+		"[foo]\na = [1,2,3,4,5,6,7,8,9,0]",
+		"$.foo.a[5]",
+		[]interface{}{
+			queryTestNode{
+				int64(6), toml.Position{2, 1},
+			},
+		})
+}
+
+func TestQuerySliceRange(t *testing.T) {
+	assertQueryPositions(t,
+		"[foo]\na = [1,2,3,4,5,6,7,8,9,0]",
+		"$.foo.a[0:5]",
+		[]interface{}{
+			queryTestNode{
+				int64(1), toml.Position{2, 1},
+			},
+			queryTestNode{
+				int64(2), toml.Position{2, 1},
+			},
+			queryTestNode{
+				int64(3), toml.Position{2, 1},
+			},
+			queryTestNode{
+				int64(4), toml.Position{2, 1},
+			},
+			queryTestNode{
+				int64(5), toml.Position{2, 1},
+			},
+		})
+}
+
+func TestQuerySliceStep(t *testing.T) {
+	assertQueryPositions(t,
+		"[foo]\na = [1,2,3,4,5,6,7,8,9,0]",
+		"$.foo.a[0:5:2]",
+		[]interface{}{
+			queryTestNode{
+				int64(1), toml.Position{2, 1},
+			},
+			queryTestNode{
+				int64(3), toml.Position{2, 1},
+			},
+			queryTestNode{
+				int64(5), toml.Position{2, 1},
+			},
+		})
+}
+
+func TestQueryAny(t *testing.T) {
+	assertQueryPositions(t,
+		"[foo.bar]\na=1\nb=2\n[foo.baz]\na=3\nb=4",
+		"$.foo.*",
+		[]interface{}{
+			queryTestNode{
+				map[string]interface{}{
+					"a": int64(1),
+					"b": int64(2),
+				}, toml.Position{1, 1},
+			},
+			queryTestNode{
+				map[string]interface{}{
+					"a": int64(3),
+					"b": int64(4),
+				}, toml.Position{4, 1},
+			},
+		})
+}
+func TestQueryUnionSimple(t *testing.T) {
+	assertQueryPositions(t,
+		"[foo.bar]\na=1\nb=2\n[baz.foo]\na=3\nb=4\n[gorf.foo]\na=5\nb=6",
+		"$.*[bar,foo]",
+		[]interface{}{
+			queryTestNode{
+				map[string]interface{}{
+					"a": int64(1),
+					"b": int64(2),
+				}, toml.Position{1, 1},
+			},
+			queryTestNode{
+				map[string]interface{}{
+					"a": int64(3),
+					"b": int64(4),
+				}, toml.Position{4, 1},
+			},
+			queryTestNode{
+				map[string]interface{}{
+					"a": int64(5),
+					"b": int64(6),
+				}, toml.Position{7, 1},
+			},
+		})
+}
+
+func TestQueryRecursionAll(t *testing.T) {
+	assertQueryPositions(t,
+		"[foo.bar]\na=1\nb=2\n[baz.foo]\na=3\nb=4\n[gorf.foo]\na=5\nb=6",
+		"$..*",
+		[]interface{}{
+			queryTestNode{
+				map[string]interface{}{
+					"foo": map[string]interface{}{
+						"bar": map[string]interface{}{
+							"a": int64(1),
+							"b": int64(2),
+						},
+					},
+					"baz": map[string]interface{}{
+						"foo": map[string]interface{}{
+							"a": int64(3),
+							"b": int64(4),
+						},
+					},
+					"gorf": map[string]interface{}{
+						"foo": map[string]interface{}{
+							"a": int64(5),
+							"b": int64(6),
+						},
+					},
+				}, toml.Position{1, 1},
+			},
+			queryTestNode{
+				map[string]interface{}{
+					"bar": map[string]interface{}{
+						"a": int64(1),
+						"b": int64(2),
+					},
+				}, toml.Position{1, 1},
+			},
+			queryTestNode{
+				map[string]interface{}{
+					"a": int64(1),
+					"b": int64(2),
+				}, toml.Position{1, 1},
+			},
+			queryTestNode{
+				int64(1), toml.Position{2, 1},
+			},
+			queryTestNode{
+				int64(2), toml.Position{3, 1},
+			},
+			queryTestNode{
+				map[string]interface{}{
+					"foo": map[string]interface{}{
+						"a": int64(3),
+						"b": int64(4),
+					},
+				}, toml.Position{4, 1},
+			},
+			queryTestNode{
+				map[string]interface{}{
+					"a": int64(3),
+					"b": int64(4),
+				}, toml.Position{4, 1},
+			},
+			queryTestNode{
+				int64(3), toml.Position{5, 1},
+			},
+			queryTestNode{
+				int64(4), toml.Position{6, 1},
+			},
+			queryTestNode{
+				map[string]interface{}{
+					"foo": map[string]interface{}{
+						"a": int64(5),
+						"b": int64(6),
+					},
+				}, toml.Position{7, 1},
+			},
+			queryTestNode{
+				map[string]interface{}{
+					"a": int64(5),
+					"b": int64(6),
+				}, toml.Position{7, 1},
+			},
+			queryTestNode{
+				int64(5), toml.Position{8, 1},
+			},
+			queryTestNode{
+				int64(6), toml.Position{9, 1},
+			},
+		})
+}
+
+func TestQueryRecursionUnionSimple(t *testing.T) {
+	assertQueryPositions(t,
+		"[foo.bar]\na=1\nb=2\n[baz.foo]\na=3\nb=4\n[gorf.foo]\na=5\nb=6",
+		"$..['foo','bar']",
+		[]interface{}{
+			queryTestNode{
+				map[string]interface{}{
+					"bar": map[string]interface{}{
+						"a": int64(1),
+						"b": int64(2),
+					},
+				}, toml.Position{1, 1},
+			},
+			queryTestNode{
+				map[string]interface{}{
+					"a": int64(3),
+					"b": int64(4),
+				}, toml.Position{4, 1},
+			},
+			queryTestNode{
+				map[string]interface{}{
+					"a": int64(1),
+					"b": int64(2),
+				}, toml.Position{1, 1},
+			},
+			queryTestNode{
+				map[string]interface{}{
+					"a": int64(5),
+					"b": int64(6),
+				}, toml.Position{7, 1},
+			},
+		})
+}
+
+func TestQueryFilterFn(t *testing.T) {
+	buff, err := ioutil.ReadFile("../example.toml")
+	if err != nil {
+		t.Error(err)
+		return
+	}
+
+	assertQueryPositions(t, string(buff),
+		"$..[?(int)]",
+		[]interface{}{
+			queryTestNode{
+				int64(8001), toml.Position{13, 1},
+			},
+			queryTestNode{
+				int64(8001), toml.Position{13, 1},
+			},
+			queryTestNode{
+				int64(8002), toml.Position{13, 1},
+			},
+			queryTestNode{
+				int64(5000), toml.Position{14, 1},
+			},
+		})
+
+	assertQueryPositions(t, string(buff),
+		"$..[?(string)]",
+		[]interface{}{
+			queryTestNode{
+				"TOML Example", toml.Position{3, 1},
+			},
+			queryTestNode{
+				"Tom Preston-Werner", toml.Position{6, 1},
+			},
+			queryTestNode{
+				"GitHub", toml.Position{7, 1},
+			},
+			queryTestNode{
+				"GitHub Cofounder & CEO\nLikes tater tots and beer.",
+				toml.Position{8, 1},
+			},
+			queryTestNode{
+				"192.168.1.1", toml.Position{12, 1},
+			},
+			queryTestNode{
+				"10.0.0.1", toml.Position{21, 3},
+			},
+			queryTestNode{
+				"eqdc10", toml.Position{22, 3},
+			},
+			queryTestNode{
+				"10.0.0.2", toml.Position{25, 3},
+			},
+			queryTestNode{
+				"eqdc10", toml.Position{26, 3},
+			},
+		})
+
+	assertQueryPositions(t, string(buff),
+		"$..[?(float)]",
+		[]interface{}{ // no float values in document
+		})
+
+	tv, _ := time.Parse(time.RFC3339, "1979-05-27T07:32:00Z")
+	assertQueryPositions(t, string(buff),
+		"$..[?(tree)]",
+		[]interface{}{
+			queryTestNode{
+				map[string]interface{}{
+					"name":         "Tom Preston-Werner",
+					"organization": "GitHub",
+					"bio":          "GitHub Cofounder & CEO\nLikes tater tots and beer.",
+					"dob":          tv,
+				}, toml.Position{5, 1},
+			},
+			queryTestNode{
+				map[string]interface{}{
+					"server":         "192.168.1.1",
+					"ports":          []interface{}{int64(8001), int64(8001), int64(8002)},
+					"connection_max": int64(5000),
+					"enabled":        true,
+				}, toml.Position{11, 1},
+			},
+			queryTestNode{
+				map[string]interface{}{
+					"alpha": map[string]interface{}{
+						"ip": "10.0.0.1",
+						"dc": "eqdc10",
+					},
+					"beta": map[string]interface{}{
+						"ip": "10.0.0.2",
+						"dc": "eqdc10",
+					},
+				}, toml.Position{17, 1},
+			},
+			queryTestNode{
+				map[string]interface{}{
+					"ip": "10.0.0.1",
+					"dc": "eqdc10",
+				}, toml.Position{20, 3},
+			},
+			queryTestNode{
+				map[string]interface{}{
+					"ip": "10.0.0.2",
+					"dc": "eqdc10",
+				}, toml.Position{24, 3},
+			},
+			queryTestNode{
+				map[string]interface{}{
+					"data": []interface{}{
+						[]interface{}{"gamma", "delta"},
+						[]interface{}{int64(1), int64(2)},
+					},
+				}, toml.Position{28, 1},
+			},
+		})
+
+	assertQueryPositions(t, string(buff),
+		"$..[?(time)]",
+		[]interface{}{
+			queryTestNode{
+				tv, toml.Position{9, 1},
+			},
+		})
+
+	assertQueryPositions(t, string(buff),
+		"$..[?(bool)]",
+		[]interface{}{
+			queryTestNode{
+				true, toml.Position{15, 1},
+			},
+		})
+}

vendor/github.com/pelletier/go-toml/query/query.go

@@ -0,0 +1,158 @@
+package query
+
+import (
+	"time"
+
+	"github.com/pelletier/go-toml"
+)
+
+// NodeFilterFn represents a user-defined filter function, for use with
+// Query.SetFilter().
+//
+// The return value of the function must indicate if 'node' is to be included
+// at this stage of the TOML path.  Returning true will include the node, and
+// returning false will exclude it.
+//
+// NOTE: Care should be taken to write script callbacks such that they are safe
+// to use from multiple goroutines.
+type NodeFilterFn func(node interface{}) bool
+
+// Result is the result of Executing a Query.
+type Result struct {
+	items     []interface{}
+	positions []toml.Position
+}
+
+// appends a value/position pair to the result set.
+func (r *Result) appendResult(node interface{}, pos toml.Position) {
+	r.items = append(r.items, node)
+	r.positions = append(r.positions, pos)
+}
+
+// Values is a set of values within a Result.  The order of values is not
+// guaranteed to be in document order, and may be different each time a query is
+// executed.
+func (r Result) Values() []interface{} {
+	return r.items
+}
+
+// Positions is a set of positions for values within a Result.  Each index
+// in Positions() corresponds to the entry in Value() of the same index.
+func (r Result) Positions() []toml.Position {
+	return r.positions
+}
+
+// runtime context for executing query paths
+type queryContext struct {
+	result       *Result
+	filters      *map[string]NodeFilterFn
+	lastPosition toml.Position
+}
+
+// generic path functor interface
+type pathFn interface {
+	setNext(next pathFn)
+	// it is the caller's responsibility to set the ctx.lastPosition before invoking call()
+	// node can be one of: *toml.Tree, []*toml.Tree, or a scalar
+	call(node interface{}, ctx *queryContext)
+}
+
+// A Query is the representation of a compiled TOML path.  A Query is safe
+// for concurrent use by multiple goroutines.
+type Query struct {
+	root    pathFn
+	tail    pathFn
+	filters *map[string]NodeFilterFn
+}
+
+func newQuery() *Query {
+	return &Query{
+		root:    nil,
+		tail:    nil,
+		filters: &defaultFilterFunctions,
+	}
+}
+
+func (q *Query) appendPath(next pathFn) {
+	if q.root == nil {
+		q.root = next
+	} else {
+		q.tail.setNext(next)
+	}
+	q.tail = next
+	next.setNext(newTerminatingFn()) // init the next functor
+}
+
+// Compile compiles a TOML path expression. The returned Query can be used
+// to match elements within a Tree and its descendants. See Execute.
+func Compile(path string) (*Query, error) {
+	return parseQuery(lexQuery(path))
+}
+
+// Execute executes a query against a Tree, and returns the result of the query.
+func (q *Query) Execute(tree *toml.Tree) *Result {
+	result := &Result{
+		items:     []interface{}{},
+		positions: []toml.Position{},
+	}
+	if q.root == nil {
+		result.appendResult(tree, tree.GetPosition(""))
+	} else {
+		ctx := &queryContext{
+			result:  result,
+			filters: q.filters,
+		}
+		ctx.lastPosition = tree.Position()
+		q.root.call(tree, ctx)
+	}
+	return result
+}
+
+// CompileAndExecute is a shorthand for Compile(path) followed by Execute(tree).
+func CompileAndExecute(path string, tree *toml.Tree) (*Result, error) {
+	query, err := Compile(path)
+	if err != nil {
+		return nil, err
+	}
+	return query.Execute(tree), nil
+}
+
+// SetFilter sets a user-defined filter function.  These may be used inside
+// "?(..)" query expressions to filter TOML document elements within a query.
+func (q *Query) SetFilter(name string, fn NodeFilterFn) {
+	if q.filters == &defaultFilterFunctions {
+		// clone the static table
+		q.filters = &map[string]NodeFilterFn{}
+		for k, v := range defaultFilterFunctions {
+			(*q.filters)[k] = v
+		}
+	}
+	(*q.filters)[name] = fn
+}
+
+var defaultFilterFunctions = map[string]NodeFilterFn{
+	"tree": func(node interface{}) bool {
+		_, ok := node.(*toml.Tree)
+		return ok
+	},
+	"int": func(node interface{}) bool {
+		_, ok := node.(int64)
+		return ok
+	},
+	"float": func(node interface{}) bool {
+		_, ok := node.(float64)
+		return ok
+	},
+	"string": func(node interface{}) bool {
+		_, ok := node.(string)
+		return ok
+	},
+	"time": func(node interface{}) bool {
+		_, ok := node.(time.Time)
+		return ok
+	},
+	"bool": func(node interface{}) bool {
+		_, ok := node.(bool)
+		return ok
+	},
+}

vendor/github.com/pelletier/go-toml/query/query_test.go

@@ -0,0 +1,157 @@
+package query
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/pelletier/go-toml"
+)
+
+func assertArrayContainsInAnyOrder(t *testing.T, array []interface{}, objects ...interface{}) {
+	if len(array) != len(objects) {
+		t.Fatalf("array contains %d objects but %d are expected", len(array), len(objects))
+	}
+
+	for _, o := range objects {
+		found := false
+		for _, a := range array {
+			if a == o {
+				found = true
+				break
+			}
+		}
+		if !found {
+			t.Fatal(o, "not found in array", array)
+		}
+	}
+}
+
+func TestQueryExample(t *testing.T) {
+	config, _ := toml.Load(`
+      [[book]]
+      title = "The Stand"
+      author = "Stephen King"
+      [[book]]
+      title = "For Whom the Bell Tolls"
+      author = "Ernest Hemmingway"
+      [[book]]
+      title = "Neuromancer"
+      author = "William Gibson"
+    `)
+	authors, err := CompileAndExecute("$.book.author", config)
+	if err != nil {
+		t.Fatal("unexpected error:", err)
+	}
+	names := authors.Values()
+	if len(names) != 3 {
+		t.Fatalf("query should return 3 names but returned %d", len(names))
+	}
+	assertArrayContainsInAnyOrder(t, names, "Stephen King", "Ernest Hemmingway", "William Gibson")
+}
+
+func TestQueryReadmeExample(t *testing.T) {
+	config, _ := toml.Load(`
+[postgres]
+user = "pelletier"
+password = "mypassword"
+`)
+
+	query, err := Compile("$..[user,password]")
+	if err != nil {
+		t.Fatal("unexpected error:", err)
+	}
+	results := query.Execute(config)
+	values := results.Values()
+	if len(values) != 2 {
+		t.Fatalf("query should return 2 values but returned %d", len(values))
+	}
+	assertArrayContainsInAnyOrder(t, values, "pelletier", "mypassword")
+}
+
+func TestQueryPathNotPresent(t *testing.T) {
+	config, _ := toml.Load(`a = "hello"`)
+	query, err := Compile("$.foo.bar")
+	if err != nil {
+		t.Fatal("unexpected error:", err)
+	}
+	results := query.Execute(config)
+	if err != nil {
+		t.Fatalf("err should be nil. got %s instead", err)
+	}
+	if len(results.items) != 0 {
+		t.Fatalf("no items should be matched. %d matched instead", len(results.items))
+	}
+}
+
+func ExampleNodeFilterFn_filterExample() {
+	tree, _ := toml.Load(`
+      [struct_one]
+      foo = "foo"
+      bar = "bar"
+
+      [struct_two]
+      baz = "baz"
+      gorf = "gorf"
+    `)
+
+	// create a query that references a user-defined-filter
+	query, _ := Compile("$[?(bazOnly)]")
+
+	// define the filter, and assign it to the query
+	query.SetFilter("bazOnly", func(node interface{}) bool {
+		if tree, ok := node.(*toml.Tree); ok {
+			return tree.Has("baz")
+		}
+		return false // reject all other node types
+	})
+
+	// results contain only the 'struct_two' Tree
+	query.Execute(tree)
+}
+
+func ExampleQuery_queryExample() {
+	config, _ := toml.Load(`
+      [[book]]
+      title = "The Stand"
+      author = "Stephen King"
+      [[book]]
+      title = "For Whom the Bell Tolls"
+      author = "Ernest Hemmingway"
+      [[book]]
+      title = "Neuromancer"
+      author = "William Gibson"
+    `)
+
+	// find and print all the authors in the document
+	query, _ := Compile("$.book.author")
+	authors := query.Execute(config)
+	for _, name := range authors.Values() {
+		fmt.Println(name)
+	}
+}
+
+func TestTomlQuery(t *testing.T) {
+	tree, err := toml.Load("[foo.bar]\na=1\nb=2\n[baz.foo]\na=3\nb=4\n[gorf.foo]\na=5\nb=6")
+	if err != nil {
+		t.Error(err)
+		return
+	}
+	query, err := Compile("$.foo.bar")
+	if err != nil {
+		t.Error(err)
+		return
+	}
+	result := query.Execute(tree)
+	values := result.Values()
+	if len(values) != 1 {
+		t.Errorf("Expected resultset of 1, got %d instead: %v", len(values), values)
+	}
+
+	if tt, ok := values[0].(*toml.Tree); !ok {
+		t.Errorf("Expected type of Tree: %T", values[0])
+	} else if tt.Get("a") != int64(1) {
+		t.Errorf("Expected 'a' with a value 1: %v", tt.Get("a"))
+	} else if tt.Get("b") != int64(2) {
+		t.Errorf("Expected 'b' with a value 2: %v", tt.Get("b"))
+	}
+}

vendor/github.com/pelletier/go-toml/query/tokens.go

@@ -0,0 +1,106 @@
+package query
+
+import (
+	"fmt"
+	"github.com/pelletier/go-toml"
+	"strconv"
+	"unicode"
+)
+
+// Define tokens
+type tokenType int
+
+const (
+	eof = -(iota + 1)
+)
+
+const (
+	tokenError tokenType = iota
+	tokenEOF
+	tokenKey
+	tokenString
+	tokenInteger
+	tokenFloat
+	tokenLeftBracket
+	tokenRightBracket
+	tokenLeftParen
+	tokenRightParen
+	tokenComma
+	tokenColon
+	tokenDollar
+	tokenStar
+	tokenQuestion
+	tokenDot
+	tokenDotDot
+)
+
+var tokenTypeNames = []string{
+	"Error",
+	"EOF",
+	"Key",
+	"String",
+	"Integer",
+	"Float",
+	"[",
+	"]",
+	"(",
+	")",
+	",",
+	":",
+	"$",
+	"*",
+	"?",
+	".",
+	"..",
+}
+
+type token struct {
+	toml.Position
+	typ tokenType
+	val string
+}
+
+func (tt tokenType) String() string {
+	idx := int(tt)
+	if idx < len(tokenTypeNames) {
+		return tokenTypeNames[idx]
+	}
+	return "Unknown"
+}
+
+func (t token) Int() int {
+	if result, err := strconv.Atoi(t.val); err != nil {
+		panic(err)
+	} else {
+		return result
+	}
+}
+
+func (t token) String() string {
+	switch t.typ {
+	case tokenEOF:
+		return "EOF"
+	case tokenError:
+		return t.val
+	}
+
+	return fmt.Sprintf("%q", t.val)
+}
+
+func isSpace(r rune) bool {
+	return r == ' ' || r == '\t'
+}
+
+func isAlphanumeric(r rune) bool {
+	return unicode.IsLetter(r) || r == '_'
+}
+
+func isDigit(r rune) bool {
+	return unicode.IsNumber(r)
+}
+
+func isHexDigit(r rune) bool {
+	return isDigit(r) ||
+		(r >= 'a' && r <= 'f') ||
+		(r >= 'A' && r <= 'F')
+}