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nimgrep: first working version

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Araq 2011-02-02 00:05:55 +01:00
commit 437eb2c37e
7 changed files with 174 additions and 46 deletions
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doc/pegdocs.txt
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@ -27,7 +27,11 @@ notation meaning
``{E}`` Capture: Apply expression `E` and store the substring
that matched `E` into a *capture* that can be accessed
after the matching process.
``$i`` back reference to the ``i``th capture. ``i`` counts from 1.
``$i`` Back reference to the ``i``th capture. ``i`` counts from 1.
``$`` Anchor: Matches at the end of the input. No character
is consumed. Same as ``!.``.
``^`` Anchor: Matches at the start of the input. No character
is consumed.
``&E`` And predicate: Indicate success if expression `E` matches
the text ahead; otherwise indicate failure. Do not consume
any text.
@ -145,7 +149,7 @@ The PEG parser implements this grammar (written in PEG syntax)::
rule <- identifier \s* "<-" expr ig
identNoArrow <- identifier !(\s* "<-")
prefixOpr <- ig '&' / ig '!' / ig '@' / ig '{@}' / ig '@@'
literal <- ig identifier? '$' [0-9]+
literal <- ig identifier? '$' [0-9]+ / '$' / '^' /
ig identNoArrow /
ig charset /
ig stringlit /