mirror of
https://github.com/gohugoio/hugo.git
synced 2024-11-21 20:46:30 -05:00
parent
d6c16afde0
commit
f6863e1ef7
4 changed files with 249 additions and 209 deletions
103
parser/pageparser/item.go
Normal file
103
parser/pageparser/item.go
Normal file
|
@ -0,0 +1,103 @@
|
|||
// Copyright 2018 The Hugo Authors. All rights reserved.
|
||||
//
|
||||
// Licensed under the Apache License, Version 2.0 (the "License");
|
||||
// you may not use this file except in compliance with the License.
|
||||
// You may obtain a copy of the License at
|
||||
// http://www.apache.org/licenses/LICENSE-2.0
|
||||
//
|
||||
// Unless required by applicable law or agreed to in writing, software
|
||||
// distributed under the License is distributed on an "AS IS" BASIS,
|
||||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
// See the License for the specific language governing permissions and
|
||||
// limitations under the License.
|
||||
|
||||
package pageparser
|
||||
|
||||
import "fmt"
|
||||
|
||||
type Item struct {
|
||||
typ itemType
|
||||
pos pos
|
||||
Val string
|
||||
}
|
||||
|
||||
func (i Item) IsText() bool {
|
||||
return i.typ == tText
|
||||
}
|
||||
|
||||
func (i Item) IsShortcodeName() bool {
|
||||
return i.typ == tScName
|
||||
}
|
||||
|
||||
func (i Item) IsLeftShortcodeDelim() bool {
|
||||
return i.typ == tLeftDelimScWithMarkup || i.typ == tLeftDelimScNoMarkup
|
||||
}
|
||||
|
||||
func (i Item) IsRightShortcodeDelim() bool {
|
||||
return i.typ == tRightDelimScWithMarkup || i.typ == tRightDelimScNoMarkup
|
||||
}
|
||||
|
||||
func (i Item) IsShortcodeClose() bool {
|
||||
return i.typ == tScClose
|
||||
}
|
||||
|
||||
func (i Item) IsShortcodeParam() bool {
|
||||
return i.typ == tScParam
|
||||
}
|
||||
|
||||
func (i Item) IsShortcodeParamVal() bool {
|
||||
return i.typ == tScParamVal
|
||||
}
|
||||
|
||||
func (i Item) IsShortcodeMarkupDelimiter() bool {
|
||||
return i.typ == tLeftDelimScWithMarkup || i.typ == tRightDelimScWithMarkup
|
||||
}
|
||||
|
||||
func (i Item) IsDone() bool {
|
||||
return i.typ == tError || i.typ == tEOF
|
||||
}
|
||||
|
||||
func (i Item) IsEOF() bool {
|
||||
return i.typ == tEOF
|
||||
}
|
||||
|
||||
func (i Item) IsError() bool {
|
||||
return i.typ == tError
|
||||
}
|
||||
|
||||
func (i Item) String() string {
|
||||
switch {
|
||||
case i.typ == tEOF:
|
||||
return "EOF"
|
||||
case i.typ == tError:
|
||||
return i.Val
|
||||
case i.typ > tKeywordMarker:
|
||||
return fmt.Sprintf("<%s>", i.Val)
|
||||
case len(i.Val) > 20:
|
||||
return fmt.Sprintf("%.20q...", i.Val)
|
||||
}
|
||||
return fmt.Sprintf("[%s]", i.Val)
|
||||
}
|
||||
|
||||
type itemType int
|
||||
|
||||
const (
|
||||
tError itemType = iota
|
||||
tEOF
|
||||
|
||||
// shortcode items
|
||||
tLeftDelimScNoMarkup
|
||||
tRightDelimScNoMarkup
|
||||
tLeftDelimScWithMarkup
|
||||
tRightDelimScWithMarkup
|
||||
tScClose
|
||||
tScName
|
||||
tScParam
|
||||
tScParamVal
|
||||
|
||||
//itemIdentifier
|
||||
tText // plain text, used for everything outside the shortcodes
|
||||
|
||||
// preserved for later - keywords come after this
|
||||
tKeywordMarker
|
||||
)
|
|
@ -11,6 +11,10 @@
|
|||
// See the License for the specific language governing permissions and
|
||||
// limitations under the License.
|
||||
|
||||
// Package pageparser provides a parser for Hugo content files (Markdown, HTML etc.) in Hugo.
|
||||
// This implementation is highly inspired by the great talk given by Rob Pike called "Lexical Scanning in Go"
|
||||
// It's on YouTube, Google it!.
|
||||
// See slides here: http://cuddle.googlecode.com/hg/talk/lex.html
|
||||
package pageparser
|
||||
|
||||
import (
|
||||
|
@ -20,177 +24,26 @@ import (
|
|||
"unicode/utf8"
|
||||
)
|
||||
|
||||
// The lexical scanning below is highly inspired by the great talk given by
|
||||
// Rob Pike called "Lexical Scanning in Go" (it's on YouTube, Google it!).
|
||||
// See slides here: http://cuddle.googlecode.com/hg/talk/lex.html
|
||||
|
||||
// parsing
|
||||
|
||||
type Tokens struct {
|
||||
lexer *pagelexer
|
||||
token [3]Item // 3-item look-ahead is what we currently need
|
||||
peekCount int
|
||||
}
|
||||
|
||||
func (t *Tokens) Next() Item {
|
||||
if t.peekCount > 0 {
|
||||
t.peekCount--
|
||||
} else {
|
||||
t.token[0] = t.lexer.nextItem()
|
||||
}
|
||||
return t.token[t.peekCount]
|
||||
}
|
||||
|
||||
// backs up one token.
|
||||
func (t *Tokens) Backup() {
|
||||
t.peekCount++
|
||||
}
|
||||
|
||||
// backs up two tokens.
|
||||
func (t *Tokens) Backup2(t1 Item) {
|
||||
t.token[1] = t1
|
||||
t.peekCount = 2
|
||||
}
|
||||
|
||||
// backs up three tokens.
|
||||
func (t *Tokens) Backup3(t2, t1 Item) {
|
||||
t.token[1] = t1
|
||||
t.token[2] = t2
|
||||
t.peekCount = 3
|
||||
}
|
||||
|
||||
// check for non-error and non-EOF types coming next
|
||||
func (t *Tokens) IsValueNext() bool {
|
||||
i := t.Peek()
|
||||
return i.typ != tError && i.typ != tEOF
|
||||
}
|
||||
|
||||
// look at, but do not consume, the next item
|
||||
// repeated, sequential calls will return the same item
|
||||
func (t *Tokens) Peek() Item {
|
||||
if t.peekCount > 0 {
|
||||
return t.token[t.peekCount-1]
|
||||
}
|
||||
t.peekCount = 1
|
||||
t.token[0] = t.lexer.nextItem()
|
||||
return t.token[0]
|
||||
}
|
||||
|
||||
// Consume is a convencience method to consume the next n tokens,
|
||||
// but back off Errors and EOF.
|
||||
func (t *Tokens) Consume(cnt int) {
|
||||
for i := 0; i < cnt; i++ {
|
||||
token := t.Next()
|
||||
if token.typ == tError || token.typ == tEOF {
|
||||
t.Backup()
|
||||
break
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// LineNumber returns the current line number. Used for logging.
|
||||
func (t *Tokens) LineNumber() int {
|
||||
return t.lexer.lineNum()
|
||||
}
|
||||
|
||||
// lexical scanning
|
||||
|
||||
// position (in bytes)
|
||||
type pos int
|
||||
|
||||
type Item struct {
|
||||
typ itemType
|
||||
pos pos
|
||||
Val string
|
||||
}
|
||||
|
||||
func (i Item) IsText() bool {
|
||||
return i.typ == tText
|
||||
}
|
||||
|
||||
func (i Item) IsShortcodeName() bool {
|
||||
return i.typ == tScName
|
||||
}
|
||||
|
||||
func (i Item) IsLeftShortcodeDelim() bool {
|
||||
return i.typ == tLeftDelimScWithMarkup || i.typ == tLeftDelimScNoMarkup
|
||||
}
|
||||
|
||||
func (i Item) IsRightShortcodeDelim() bool {
|
||||
return i.typ == tRightDelimScWithMarkup || i.typ == tRightDelimScNoMarkup
|
||||
}
|
||||
|
||||
func (i Item) IsShortcodeClose() bool {
|
||||
return i.typ == tScClose
|
||||
}
|
||||
|
||||
func (i Item) IsShortcodeParam() bool {
|
||||
return i.typ == tScParam
|
||||
}
|
||||
|
||||
func (i Item) IsShortcodeParamVal() bool {
|
||||
return i.typ == tScParamVal
|
||||
}
|
||||
|
||||
func (i Item) IsShortcodeMarkupDelimiter() bool {
|
||||
return i.typ == tLeftDelimScWithMarkup || i.typ == tRightDelimScWithMarkup
|
||||
}
|
||||
|
||||
func (i Item) IsDone() bool {
|
||||
return i.typ == tError || i.typ == tEOF
|
||||
}
|
||||
|
||||
func (i Item) IsEOF() bool {
|
||||
return i.typ == tEOF
|
||||
}
|
||||
|
||||
func (i Item) IsError() bool {
|
||||
return i.typ == tError
|
||||
}
|
||||
|
||||
func (i Item) String() string {
|
||||
switch {
|
||||
case i.typ == tEOF:
|
||||
return "EOF"
|
||||
case i.typ == tError:
|
||||
return i.Val
|
||||
case i.typ > tKeywordMarker:
|
||||
return fmt.Sprintf("<%s>", i.Val)
|
||||
case len(i.Val) > 20:
|
||||
return fmt.Sprintf("%.20q...", i.Val)
|
||||
}
|
||||
return fmt.Sprintf("[%s]", i.Val)
|
||||
}
|
||||
|
||||
type itemType int
|
||||
|
||||
const (
|
||||
tError itemType = iota
|
||||
tEOF
|
||||
|
||||
// shortcode items
|
||||
tLeftDelimScNoMarkup
|
||||
tRightDelimScNoMarkup
|
||||
tLeftDelimScWithMarkup
|
||||
tRightDelimScWithMarkup
|
||||
tScClose
|
||||
tScName
|
||||
tScParam
|
||||
tScParamVal
|
||||
|
||||
//itemIdentifier
|
||||
tText // plain text, used for everything outside the shortcodes
|
||||
|
||||
// preserved for later - keywords come after this
|
||||
tKeywordMarker
|
||||
)
|
||||
|
||||
const eof = -1
|
||||
|
||||
// returns the next state in scanner.
|
||||
type stateFunc func(*pagelexer) stateFunc
|
||||
type stateFunc func(*pageLexer) stateFunc
|
||||
|
||||
type pagelexer struct {
|
||||
type lexerShortcodeState struct {
|
||||
currLeftDelimItem itemType
|
||||
currRightDelimItem itemType
|
||||
currShortcodeName string // is only set when a shortcode is in opened state
|
||||
closingState int // > 0 = on its way to be closed
|
||||
elementStepNum int // step number in element
|
||||
paramElements int // number of elements (name + value = 2) found first
|
||||
openShortcodes map[string]bool // set of shortcodes in open state
|
||||
|
||||
}
|
||||
|
||||
type pageLexer struct {
|
||||
name string
|
||||
input string
|
||||
state stateFunc
|
||||
|
@ -199,14 +52,7 @@ type pagelexer struct {
|
|||
width pos // width of last element
|
||||
lastPos pos // position of the last item returned by nextItem
|
||||
|
||||
// shortcode state
|
||||
currLeftDelimItem itemType
|
||||
currRightDelimItem itemType
|
||||
currShortcodeName string // is only set when a shortcode is in opened state
|
||||
closingState int // > 0 = on its way to be closed
|
||||
elementStepNum int // step number in element
|
||||
paramElements int // number of elements (name + value = 2) found first
|
||||
openShortcodes map[string]bool // set of shortcodes in open state
|
||||
lexerShortcodeState
|
||||
|
||||
// items delivered to client
|
||||
items []Item
|
||||
|
@ -217,31 +63,35 @@ func Parse(s string) *Tokens {
|
|||
}
|
||||
|
||||
func ParseFrom(s string, from int) *Tokens {
|
||||
return &Tokens{lexer: newShortcodeLexer("default", s, pos(from))}
|
||||
lexer := newPageLexer("default", s, pos(from))
|
||||
lexer.run()
|
||||
return &Tokens{lexer: lexer}
|
||||
}
|
||||
|
||||
// note: the input position here is normally 0 (start), but
|
||||
// can be set if position of first shortcode is known
|
||||
func newShortcodeLexer(name, input string, inputPosition pos) *pagelexer {
|
||||
lexer := &pagelexer{
|
||||
name: name,
|
||||
input: input,
|
||||
currLeftDelimItem: tLeftDelimScNoMarkup,
|
||||
currRightDelimItem: tRightDelimScNoMarkup,
|
||||
pos: inputPosition,
|
||||
openShortcodes: make(map[string]bool),
|
||||
items: make([]Item, 0, 5),
|
||||
func newPageLexer(name, input string, inputPosition pos) *pageLexer {
|
||||
lexer := &pageLexer{
|
||||
name: name,
|
||||
input: input,
|
||||
pos: inputPosition,
|
||||
lexerShortcodeState: lexerShortcodeState{
|
||||
currLeftDelimItem: tLeftDelimScNoMarkup,
|
||||
currRightDelimItem: tRightDelimScNoMarkup,
|
||||
openShortcodes: make(map[string]bool),
|
||||
},
|
||||
items: make([]Item, 0, 5),
|
||||
}
|
||||
lexer.runShortcodeLexer()
|
||||
|
||||
return lexer
|
||||
}
|
||||
|
||||
// main loop
|
||||
// this looks kind of funky, but it works
|
||||
func (l *pagelexer) runShortcodeLexer() {
|
||||
func (l *pageLexer) run() *pageLexer {
|
||||
for l.state = lexTextOutsideShortcodes; l.state != nil; {
|
||||
l.state = l.state(l)
|
||||
}
|
||||
return l
|
||||
}
|
||||
|
||||
// state functions
|
||||
|
@ -255,7 +105,7 @@ const (
|
|||
rightComment = "*/"
|
||||
)
|
||||
|
||||
func (l *pagelexer) next() rune {
|
||||
func (l *pageLexer) next() rune {
|
||||
if int(l.pos) >= len(l.input) {
|
||||
l.width = 0
|
||||
return eof
|
||||
|
@ -270,25 +120,25 @@ func (l *pagelexer) next() rune {
|
|||
}
|
||||
|
||||
// peek, but no consume
|
||||
func (l *pagelexer) peek() rune {
|
||||
func (l *pageLexer) peek() rune {
|
||||
r := l.next()
|
||||
l.backup()
|
||||
return r
|
||||
}
|
||||
|
||||
// steps back one
|
||||
func (l *pagelexer) backup() {
|
||||
func (l *pageLexer) backup() {
|
||||
l.pos -= l.width
|
||||
}
|
||||
|
||||
// sends an item back to the client.
|
||||
func (l *pagelexer) emit(t itemType) {
|
||||
func (l *pageLexer) emit(t itemType) {
|
||||
l.items = append(l.items, Item{t, l.start, l.input[l.start:l.pos]})
|
||||
l.start = l.pos
|
||||
}
|
||||
|
||||
// special case, do not send '\\' back to client
|
||||
func (l *pagelexer) ignoreEscapesAndEmit(t itemType) {
|
||||
func (l *pageLexer) ignoreEscapesAndEmit(t itemType) {
|
||||
val := strings.Map(func(r rune) rune {
|
||||
if r == '\\' {
|
||||
return -1
|
||||
|
@ -300,28 +150,28 @@ func (l *pagelexer) ignoreEscapesAndEmit(t itemType) {
|
|||
}
|
||||
|
||||
// gets the current value (for debugging and error handling)
|
||||
func (l *pagelexer) current() string {
|
||||
func (l *pageLexer) current() string {
|
||||
return l.input[l.start:l.pos]
|
||||
}
|
||||
|
||||
// ignore current element
|
||||
func (l *pagelexer) ignore() {
|
||||
func (l *pageLexer) ignore() {
|
||||
l.start = l.pos
|
||||
}
|
||||
|
||||
// nice to have in error logs
|
||||
func (l *pagelexer) lineNum() int {
|
||||
func (l *pageLexer) lineNum() int {
|
||||
return strings.Count(l.input[:l.lastPos], "\n") + 1
|
||||
}
|
||||
|
||||
// nil terminates the parser
|
||||
func (l *pagelexer) errorf(format string, args ...interface{}) stateFunc {
|
||||
func (l *pageLexer) errorf(format string, args ...interface{}) stateFunc {
|
||||
l.items = append(l.items, Item{tError, l.start, fmt.Sprintf(format, args...)})
|
||||
return nil
|
||||
}
|
||||
|
||||
// consumes and returns the next item
|
||||
func (l *pagelexer) nextItem() Item {
|
||||
func (l *pageLexer) nextItem() Item {
|
||||
item := l.items[0]
|
||||
l.items = l.items[1:]
|
||||
l.lastPos = item.pos
|
||||
|
@ -330,7 +180,7 @@ func (l *pagelexer) nextItem() Item {
|
|||
|
||||
// scans until an opening shortcode opening bracket.
|
||||
// if no shortcodes, it will keep on scanning until EOF
|
||||
func lexTextOutsideShortcodes(l *pagelexer) stateFunc {
|
||||
func lexTextOutsideShortcodes(l *pageLexer) stateFunc {
|
||||
for {
|
||||
if strings.HasPrefix(l.input[l.pos:], leftDelimScWithMarkup) || strings.HasPrefix(l.input[l.pos:], leftDelimScNoMarkup) {
|
||||
if l.pos > l.start {
|
||||
|
@ -358,7 +208,7 @@ func lexTextOutsideShortcodes(l *pagelexer) stateFunc {
|
|||
return nil
|
||||
}
|
||||
|
||||
func lexShortcodeLeftDelim(l *pagelexer) stateFunc {
|
||||
func lexShortcodeLeftDelim(l *pageLexer) stateFunc {
|
||||
l.pos += pos(len(l.currentLeftShortcodeDelim()))
|
||||
if strings.HasPrefix(l.input[l.pos:], leftComment) {
|
||||
return lexShortcodeComment
|
||||
|
@ -369,7 +219,7 @@ func lexShortcodeLeftDelim(l *pagelexer) stateFunc {
|
|||
return lexInsideShortcode
|
||||
}
|
||||
|
||||
func lexShortcodeComment(l *pagelexer) stateFunc {
|
||||
func lexShortcodeComment(l *pageLexer) stateFunc {
|
||||
posRightComment := strings.Index(l.input[l.pos:], rightComment+l.currentRightShortcodeDelim())
|
||||
if posRightComment <= 1 {
|
||||
return l.errorf("comment must be closed")
|
||||
|
@ -387,7 +237,7 @@ func lexShortcodeComment(l *pagelexer) stateFunc {
|
|||
return lexTextOutsideShortcodes
|
||||
}
|
||||
|
||||
func lexShortcodeRightDelim(l *pagelexer) stateFunc {
|
||||
func lexShortcodeRightDelim(l *pageLexer) stateFunc {
|
||||
l.closingState = 0
|
||||
l.pos += pos(len(l.currentRightShortcodeDelim()))
|
||||
l.emit(l.currentRightShortcodeDelimItem())
|
||||
|
@ -399,7 +249,7 @@ func lexShortcodeRightDelim(l *pagelexer) stateFunc {
|
|||
// 2. "param" or "param\"
|
||||
// 3. param="123" or param="123\"
|
||||
// 4. param="Some \"escaped\" text"
|
||||
func lexShortcodeParam(l *pagelexer, escapedQuoteStart bool) stateFunc {
|
||||
func lexShortcodeParam(l *pageLexer, escapedQuoteStart bool) stateFunc {
|
||||
|
||||
first := true
|
||||
nextEq := false
|
||||
|
@ -451,7 +301,7 @@ func lexShortcodeParam(l *pagelexer, escapedQuoteStart bool) stateFunc {
|
|||
|
||||
}
|
||||
|
||||
func lexShortcodeQuotedParamVal(l *pagelexer, escapedQuotedValuesAllowed bool, typ itemType) stateFunc {
|
||||
func lexShortcodeQuotedParamVal(l *pageLexer, escapedQuotedValuesAllowed bool, typ itemType) stateFunc {
|
||||
openQuoteFound := false
|
||||
escapedInnerQuoteFound := false
|
||||
escapedQuoteState := 0
|
||||
|
@ -516,7 +366,7 @@ Loop:
|
|||
}
|
||||
|
||||
// scans an alphanumeric inside shortcode
|
||||
func lexIdentifierInShortcode(l *pagelexer) stateFunc {
|
||||
func lexIdentifierInShortcode(l *pageLexer) stateFunc {
|
||||
lookForEnd := false
|
||||
Loop:
|
||||
for {
|
||||
|
@ -549,7 +399,7 @@ Loop:
|
|||
return lexInsideShortcode
|
||||
}
|
||||
|
||||
func lexEndOfShortcode(l *pagelexer) stateFunc {
|
||||
func lexEndOfShortcode(l *pageLexer) stateFunc {
|
||||
if strings.HasPrefix(l.input[l.pos:], l.currentRightShortcodeDelim()) {
|
||||
return lexShortcodeRightDelim
|
||||
}
|
||||
|
@ -563,7 +413,7 @@ func lexEndOfShortcode(l *pagelexer) stateFunc {
|
|||
}
|
||||
|
||||
// scans the elements inside shortcode tags
|
||||
func lexInsideShortcode(l *pagelexer) stateFunc {
|
||||
func lexInsideShortcode(l *pageLexer) stateFunc {
|
||||
if strings.HasPrefix(l.input[l.pos:], l.currentRightShortcodeDelim()) {
|
||||
return lexShortcodeRightDelim
|
||||
}
|
||||
|
@ -601,15 +451,15 @@ func lexInsideShortcode(l *pagelexer) stateFunc {
|
|||
|
||||
// state helpers
|
||||
|
||||
func (l *pagelexer) currentLeftShortcodeDelimItem() itemType {
|
||||
func (l *pageLexer) currentLeftShortcodeDelimItem() itemType {
|
||||
return l.currLeftDelimItem
|
||||
}
|
||||
|
||||
func (l *pagelexer) currentRightShortcodeDelimItem() itemType {
|
||||
func (l *pageLexer) currentRightShortcodeDelimItem() itemType {
|
||||
return l.currRightDelimItem
|
||||
}
|
||||
|
||||
func (l *pagelexer) currentLeftShortcodeDelim() string {
|
||||
func (l *pageLexer) currentLeftShortcodeDelim() string {
|
||||
if l.currLeftDelimItem == tLeftDelimScWithMarkup {
|
||||
return leftDelimScWithMarkup
|
||||
}
|
||||
|
@ -617,7 +467,7 @@ func (l *pagelexer) currentLeftShortcodeDelim() string {
|
|||
|
||||
}
|
||||
|
||||
func (l *pagelexer) currentRightShortcodeDelim() string {
|
||||
func (l *pageLexer) currentRightShortcodeDelim() string {
|
||||
if l.currRightDelimItem == tRightDelimScWithMarkup {
|
||||
return rightDelimScWithMarkup
|
||||
}
|
87
parser/pageparser/pageparser.go
Normal file
87
parser/pageparser/pageparser.go
Normal file
|
@ -0,0 +1,87 @@
|
|||
// Copyright 2018 The Hugo Authors. All rights reserved.
|
||||
//
|
||||
// Licensed under the Apache License, Version 2.0 (the "License");
|
||||
// you may not use this file except in compliance with the License.
|
||||
// You may obtain a copy of the License at
|
||||
// http://www.apache.org/licenses/LICENSE-2.0
|
||||
//
|
||||
// Unless required by applicable law or agreed to in writing, software
|
||||
// distributed under the License is distributed on an "AS IS" BASIS,
|
||||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
// See the License for the specific language governing permissions and
|
||||
// limitations under the License.
|
||||
|
||||
// Package pageparser provides a parser for Hugo content files (Markdown, HTML etc.) in Hugo.
|
||||
// This implementation is highly inspired by the great talk given by Rob Pike called "Lexical Scanning in Go"
|
||||
// It's on YouTube, Google it!.
|
||||
// See slides here: http://cuddle.googlecode.com/hg/talk/lex.html
|
||||
package pageparser
|
||||
|
||||
// The lexical scanning below
|
||||
|
||||
type Tokens struct {
|
||||
lexer *pageLexer
|
||||
token [3]Item // 3-item look-ahead is what we currently need
|
||||
peekCount int
|
||||
}
|
||||
|
||||
func (t *Tokens) Next() Item {
|
||||
if t.peekCount > 0 {
|
||||
t.peekCount--
|
||||
} else {
|
||||
t.token[0] = t.lexer.nextItem()
|
||||
}
|
||||
return t.token[t.peekCount]
|
||||
}
|
||||
|
||||
// backs up one token.
|
||||
func (t *Tokens) Backup() {
|
||||
t.peekCount++
|
||||
}
|
||||
|
||||
// backs up two tokens.
|
||||
func (t *Tokens) Backup2(t1 Item) {
|
||||
t.token[1] = t1
|
||||
t.peekCount = 2
|
||||
}
|
||||
|
||||
// backs up three tokens.
|
||||
func (t *Tokens) Backup3(t2, t1 Item) {
|
||||
t.token[1] = t1
|
||||
t.token[2] = t2
|
||||
t.peekCount = 3
|
||||
}
|
||||
|
||||
// check for non-error and non-EOF types coming next
|
||||
func (t *Tokens) IsValueNext() bool {
|
||||
i := t.Peek()
|
||||
return i.typ != tError && i.typ != tEOF
|
||||
}
|
||||
|
||||
// look at, but do not consume, the next item
|
||||
// repeated, sequential calls will return the same item
|
||||
func (t *Tokens) Peek() Item {
|
||||
if t.peekCount > 0 {
|
||||
return t.token[t.peekCount-1]
|
||||
}
|
||||
t.peekCount = 1
|
||||
t.token[0] = t.lexer.nextItem()
|
||||
return t.token[0]
|
||||
}
|
||||
|
||||
// Consume is a convencience method to consume the next n tokens,
|
||||
// but back off Errors and EOF.
|
||||
func (t *Tokens) Consume(cnt int) {
|
||||
for i := 0; i < cnt; i++ {
|
||||
token := t.Next()
|
||||
if token.typ == tError || token.typ == tEOF {
|
||||
t.Backup()
|
||||
break
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// LineNumber returns the current line number. Used for logging.
|
||||
func (t *Tokens) LineNumber() int {
|
||||
return t.lexer.lineNum()
|
||||
}
|
|
@ -179,7 +179,7 @@ func BenchmarkShortcodeLexer(b *testing.B) {
|
|||
}
|
||||
|
||||
func collect(t *shortCodeLexerTest) (items []Item) {
|
||||
l := newShortcodeLexer(t.name, t.input, 0)
|
||||
l := newPageLexer(t.name, t.input, 0).run()
|
||||
for {
|
||||
item := l.nextItem()
|
||||
items = append(items, item)
|
Loading…
Reference in a new issue