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Markdown indented code blocks (#20473)

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* Implement Markdown indented code blocks

Additional indentation of 4 spaces makes a block an "indented code block"
(monospaced text without syntax highlighting).
Also `::` RST syntax for code blocks is disabled.

So instead of
```rst
see::

  Some code
```

the code block should be written as
```markdown
see:

    Some code
```

* Migrate RST literal blocks :: to Markdown's ones
This commit is contained in:
Andrey Makarov 2022-10-05 21:03:10 +03:00 • committed by GitHub
commit 6505bd347d
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62
doc/pegdocs.txt
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@ -131,44 +131,44 @@ notation meaning
Supported PEG grammar
---------------------
The PEG parser implements this grammar (written in PEG syntax)::
The PEG parser implements this grammar (written in PEG syntax):
# Example grammar of PEG in PEG syntax.
# Comments start with '#'.
# First symbol is the start symbol.
# Example grammar of PEG in PEG syntax.
# Comments start with '#'.
# First symbol is the start symbol.
grammar <- rule* / expr
grammar <- rule* / expr
identifier <- [A-Za-z][A-Za-z0-9_]*
charsetchar <- "\\" . / [^\]]
charset <- "[" "^"? (charsetchar ("-" charsetchar)?)+ "]"
stringlit <- identifier? ("\"" ("\\" . / [^"])* "\"" /
"'" ("\\" . / [^'])* "'")
builtin <- "\\" identifier / [^\13\10]
identifier <- [A-Za-z][A-Za-z0-9_]*
charsetchar <- "\\" . / [^\]]
charset <- "[" "^"? (charsetchar ("-" charsetchar)?)+ "]"
stringlit <- identifier? ("\"" ("\\" . / [^"])* "\"" /
"'" ("\\" . / [^'])* "'")
builtin <- "\\" identifier / [^\13\10]
comment <- '#' @ \n
ig <- (\s / comment)* # things to ignore
comment <- '#' @ \n
ig <- (\s / comment)* # things to ignore
rule <- identifier \s* "<-" expr ig
identNoArrow <- identifier !(\s* "<-")
prefixOpr <- ig '&' / ig '!' / ig '@' / ig '{@}' / ig '@@'
literal <- ig identifier? '$' '^'? [0-9]+ / '$' / '^' /
ig identNoArrow /
ig charset /
ig stringlit /
ig builtin /
ig '.' /
ig '_' /
(ig "(" expr ig ")") /
(ig "{" expr? ig "}")
postfixOpr <- ig '?' / ig '*' / ig '+'
primary <- prefixOpr* (literal postfixOpr*)
rule <- identifier \s* "<-" expr ig
identNoArrow <- identifier !(\s* "<-")
prefixOpr <- ig '&' / ig '!' / ig '@' / ig '{@}' / ig '@@'
literal <- ig identifier? '$' '^'? [0-9]+ / '$' / '^' /
ig identNoArrow /
ig charset /
ig stringlit /
ig builtin /
ig '.' /
ig '_' /
(ig "(" expr ig ")") /
(ig "{" expr? ig "}")
postfixOpr <- ig '?' / ig '*' / ig '+'
primary <- prefixOpr* (literal postfixOpr*)
# Concatenation has higher priority than choice:
# ``a b / c`` means ``(a b) / c``
# Concatenation has higher priority than choice:
# ``a b / c`` means ``(a b) / c``
seqExpr <- primary+
expr <- seqExpr (ig "/" expr)*
seqExpr <- primary+
expr <- seqExpr (ig "/" expr)*
**Note**: As a special syntactic extension if the whole PEG is only a single