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parser/pageparser: Fix handling of commented out front matter

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When the page parser was rewritten in 0.51, this was interpreted literally, but commented out front matter is used in the wild to "hide it from GitHub", e.g:

```
<!--
+++
title = "hello"
+++
-->
```

Fixes #5478
This commit is contained in:
Bjørn Erik Pedersen 2018-11-28 10:21:54 +01:00
parent 7e75aeca80
commit 7540a62834
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GPG key ID: 330E6E2BD4859D8F
6 changed files with 65 additions and 13 deletions
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4
parser/pageparser/pageparser_intro_test.go
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@ -60,7 +60,8 @@ var frontMatterTests = []lexerTest{
{"No front matter", "\nSome text.\n", []Item{tstSomeText, tstEOF}},
{"YAML front matter", "---\nfoo: \"bar\"\n---\n\nSome text.\n", []Item{tstFrontMatterYAML, tstSomeText, tstEOF}},
{"YAML empty front matter", "---\n---\n\nSome text.\n", []Item{nti(TypeFrontMatterYAML, ""), tstSomeText, tstEOF}},
{"YAML commented out front matter", "<!--\n---\nfoo: \"bar\"\n---\n-->\nSome text.\n", []Item{nti(TypeHTMLComment, "<!--\n---\nfoo: \"bar\"\n---\n-->"), tstSomeText, tstEOF}},
{"YAML commented out front matter", "<!--\n---\nfoo: \"bar\"\n---\n-->\nSome text.\n", []Item{nti(TypeIgnore, "<!--\n"), tstFrontMatterYAML, nti(TypeIgnore, "-->"), tstSomeText, tstEOF}},
{"YAML commented out front matter, no end", "<!--\n---\nfoo: \"bar\"\n---\nSome text.\n", []Item{nti(TypeIgnore, "<!--\n"), tstFrontMatterYAML, nti(tError, "starting HTML comment with no end")}},
// Note that we keep all bytes as they are, but we need to handle CRLF
{"YAML front matter CRLF", "---\r\nfoo: \"bar\"\r\n---\n\nSome text.\n", []Item{tstFrontMatterYAMLCRLF, tstSomeText, tstEOF}},
{"TOML front matter", "+++\nfoo = \"bar\"\n+++\n\nSome text.\n", []Item{tstFrontMatterTOML, tstSomeText, tstEOF}},
@ -78,7 +79,6 @@ var frontMatterTests = []lexerTest{
func TestFrontMatter(t *testing.T) {
t.Parallel()
for i, test := range frontMatterTests {
items := collect([]byte(test.input), false, lexIntroSection)
if !equal(items, test.items) {
got := crLfReplacer.Replace(fmt.Sprint(items))