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Fix parsing edge case of frontmatter

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When the frontmatter contains a - (or other delimiter) close to the
closing frontmatter delimiter, frontmatter detection would fail.
This commit is contained in:
Noah Campbell 2013-09-18 09:15:46 -07:00
parent a82efe5bb1
commit d8e1834910
8 changed files with 100 additions and 68 deletions
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54
parser/page.go
View file

@ -2,9 +2,9 @@ package parser
import (
"bufio"
"fmt"
"bytes"
"errors"
"fmt"
"io"
"unicode"
)
@ -164,22 +164,34 @@ func determineDelims(firstLine []byte) (left, right []byte) {
}
func extractFrontMatterDelims(r *bufio.Reader, left, right []byte) (fm FrontMatter, err error) {
var level int = 0
var sameDelim = bytes.Equal(left, right)
var (
c byte
level int = 0
bytesRead int = 0
sameDelim = bytes.Equal(left, right)
)
wr := new(bytes.Buffer)
for {
c, err := r.ReadByte()
if err != nil {
return nil, err
if c, err = r.ReadByte(); err != nil {
return nil, fmt.Errorf("Unable to read frontmatter at filepos %d: %s", bytesRead, err)
}
bytesRead += 1
switch c {
case left[0]:
match, err := matches(r, wr, []byte{c}, left)
if err != nil {
var (
buf []byte = []byte{c}
remaining []byte
)
if remaining, err = r.Peek(len(left) - 1); err != nil {
return nil, err
}
if match {
buf = append(buf, remaining...)
if bytes.Equal(buf, left) {
if sameDelim {
if level == 0 {
level = 1
@ -190,6 +202,19 @@ func extractFrontMatterDelims(r *bufio.Reader, left, right []byte) (fm FrontMatt
level += 1
}
}
if _, err = wr.Write([]byte{c}); err != nil {
return nil, err
}
if level == 0 {
if _, err = r.Read(remaining); err != nil {
return nil, err
}
if _, err = wr.Write(remaining); err != nil {
return nil, err
}
}
case right[0]:
match, err := matches(r, wr, []byte{c}, right)
if err != nil {
@ -216,6 +241,10 @@ func extractFrontMatterDelims(r *bufio.Reader, left, right []byte) (fm FrontMatt
return nil, errors.New("Could not find front matter.")
}
func matches_quick(buf, expected []byte) (ok bool, err error) {
return bytes.Equal(expected, buf), nil
}
func matches(r *bufio.Reader, wr io.Writer, c, expected []byte) (ok bool, err error) {
if len(expected) == 1 {
if _, err = wr.Write(c); err != nil {
@ -223,16 +252,13 @@ func matches(r *bufio.Reader, wr io.Writer, c, expected []byte) (ok bool, err er
}
return bytes.Equal(c, expected), nil
}
buf := make([]byte, len(expected)-1)
if _, err = r.Read(buf); err != nil {
if buf, err = r.Peek(len(expected) - 1); err != nil {
return
}
buf = append(c, buf...)
if _, err = wr.Write(buf); err != nil {
return
}
return bytes.Equal(expected, buf), nil
}

26
parser/parse_frontmatter_test.go
View file

@ -24,12 +24,15 @@ var (
CONTENT_INCOMPLETE_BEG_FM_DELIM = "--\ntitle: incomplete beg fm delim\n---\nincomplete frontmatter delim"
CONTENT_INCOMPLETE_END_FM_DELIM = "---\ntitle: incomplete end fm delim\n--\nincomplete frontmatter delim"
CONTENT_MISSING_END_FM_DELIM = "---\ntitle: incomplete end fm delim\nincomplete frontmatter delim"
CONTENT_SLUG_WORKING = "---\ntitle: slug doc 2\nslug: slug-doc-2\n\n---\nslug doc 2 content"
CONTENT_SLUG_WORKING_VARIATION = "---\ntitle: slug doc 3\nslug: slug-doc 3\n---\nslug doc 3 content"
CONTENT_SLUG_BUG = "---\ntitle: slug doc 2\nslug: slug-doc-2\n---\nslug doc 2 content"
CONTENT_FM_NO_DOC = "---\ntitle: no doc\n---"
CONTENT_WITH_JS_FM = "{\n \"categories\": \"d\",\n \"tags\": [\n \"a\", \n \"b\", \n \"c\"\n ]\n}\nJSON Front Matter with tags and categories"
CONTENT_WITH_JS_FM = "{\n \"categories\": \"d\",\n \"tags\": [\n \"a\", \n \"b\", \n \"c\"\n ]\n}\nJSON Front Matter with tags and categories"
)
var lineEndings = []string{"\n", "\r\n"}
var delimiters = []string{"-", "+"}
var delimiters = []string{"---", "+++"}
func pageMust(p Page, err error) *page {
if err != nil {
@ -83,13 +86,13 @@ func checkPageFrontMatterContent(t *testing.T, p *page, frontMatter string) {
return
}
if !bytes.Equal(p.frontmatter, []byte(frontMatter)) {
t.Errorf("expected frontmatter %q, got %q", frontMatter, p.frontmatter)
t.Errorf("frontmatter mismatch\nexp: %q\ngot: %q", frontMatter, p.frontmatter)
}
}
func checkPageContent(t *testing.T, p *page, expected string) {
if !bytes.Equal(p.content, []byte(expected)) {
t.Errorf("expected content %q, got %q", expected, p.content)
t.Errorf("content mismatch\nexp: %q\ngot: %q", expected, p.content)
}
}
@ -101,6 +104,7 @@ func TestStandaloneCreatePageFrom(t *testing.T) {
frontMatter string
bodycontent string
}{
{CONTENT_NO_FRONTMATTER, true, true, "", "a page with no front matter"},
{CONTENT_WITH_FRONTMATTER, true, false, "---\ntitle: front matter\n---\n", "Content with front matter"},
{CONTENT_HTML_NODOCTYPE, false, true, "", "<html>\n\t<body>\n\t</body>\n</html>"},
@ -109,6 +113,9 @@ func TestStandaloneCreatePageFrom(t *testing.T) {
{CONTENT_LWS_HTML, false, true, "", "<html><body></body></html>"},
{CONTENT_LWS_LF_HTML, false, true, "", "<html><body></body></html>"},
{CONTENT_WITH_JS_FM, true, false, "{\n \"categories\": \"d\",\n \"tags\": [\n \"a\", \n \"b\", \n \"c\"\n ]\n}", "JSON Front Matter with tags and categories"},
{CONTENT_SLUG_WORKING, true, false, "---\ntitle: slug doc 2\nslug: slug-doc-2\n\n---\n", "slug doc 2 content"},
{CONTENT_SLUG_WORKING_VARIATION, true, false, "---\ntitle: slug doc 3\nslug: slug-doc 3\n---\n", "slug doc 3 content"},
{CONTENT_SLUG_BUG, true, false, "---\ntitle: slug doc 2\nslug: slug-doc-2\n---\n", "slug doc 2 content"},
}
for _, test := range tests {
@ -224,6 +231,7 @@ func TestExtractFrontMatter(t *testing.T) {
{"---\nralb\n---\n", []byte("---\nralb\n---\n"), true},
{"---\nminc\n---\ncontent", []byte("---\nminc\n---\n"), true},
{"---\ncnim\n---\ncontent\n", []byte("---\ncnim\n---\n"), true},
{"---\ntitle: slug doc 2\nslug: slug-doc-2\n---\ncontent\n", []byte("---\ntitle: slug doc 2\nslug: slug-doc-2\n---\n"), true},
}
for _, test := range tests {
@ -231,8 +239,8 @@ func TestExtractFrontMatter(t *testing.T) {
test.frontmatter = strings.Replace(test.frontmatter, "\n", ending, -1)
test.extracted = bytes.Replace(test.extracted, []byte("\n"), []byte(ending), -1)
for _, delim := range delimiters {
test.frontmatter = strings.Replace(test.frontmatter, "-", delim, -1)
test.extracted = bytes.Replace(test.extracted, []byte("-"), []byte(delim), -1)
test.frontmatter = strings.Replace(test.frontmatter, "---", delim, -1)
test.extracted = bytes.Replace(test.extracted, []byte("---"), []byte(delim), -1)
line, err := peekLine(bufio.NewReader(strings.NewReader(test.frontmatter)))
if err != nil {
continue
@ -245,8 +253,7 @@ func TestExtractFrontMatter(t *testing.T) {
continue
}
if !bytes.Equal(fm, test.extracted) {
t.Logf("\n%q\n", string(test.frontmatter))
t.Errorf("Expected front matter %q. got %q", string(test.extracted), fm)
t.Errorf("Frontmatter did not match:\nexp: %q\ngot: %q", string(test.extracted), fm)
}
}
}
@ -285,8 +292,7 @@ func TestExtractFrontMatterDelim(t *testing.T) {
}
if !bytes.Equal(fm, []byte(test.extracted)) {
t.Logf("\n%q\n", string(test.frontmatter))
t.Errorf("Expected front matter %q. got %q", string(test.extracted), fm)
t.Errorf("Frontmatter did not match:\nexp: %q\ngot: %q", string(test.extracted), fm)
}
}
}