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Fix README example grammar

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Josh Holtrop 2024-04-06 14:16:27 -04:00
parent 3a8dcac55f
commit 19c32b58dc
1 changed files with 16 additions and 31 deletions
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47
README.md
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@ -17,6 +17,7 @@ can be copied into and versioned in a project's source tree.
The only requirement to run Propane is that the system has a Ruby interpreter The only requirement to run Propane is that the system has a Ruby interpreter
installed. installed.
The latest release can be downloaded from [https://github.com/holtrop/propane/releases](https://github.com/holtrop/propane/releases). The latest release can be downloaded from [https://github.com/holtrop/propane/releases](https://github.com/holtrop/propane/releases).
Simply copy the `propane` executable script into the desired location within Simply copy the `propane` executable script into the desired location within
the project to be built (typically the root of the repository) and mark it the project to be built (typically the root of the repository) and mark it
executable. executable.
@ -55,10 +56,10 @@ import std.math;
ptype ulong; ptype ulong;
# A few basic arithmetic operators. # A few basic arithmetic operators.
token plus /\\+/; token plus /\+/;
token times /\\*/; token times /\*/;
token power /\\*\\*/; token power /\*\*/;
token integer /\\d+/ << token integer /\d+/ <<
ulong v; ulong v;
foreach (c; match) foreach (c; match)
{ {
@ -67,38 +68,22 @@ token integer /\\d+/ <<
} }
$$ = v; $$ = v;
>> >>
token lparen /\\(/; token lparen /\(/;
token rparen /\\)/; token rparen /\)/;
# Drop whitespace. # Drop whitespace.
drop /\\s+/; drop /\s+/;
Start -> E1 << Start -> E1 << $$ = $1; >>
$$ = $1; E1 -> E2 << $$ = $1; >>
>> E1 -> E1 plus E2 << $$ = $1 + $3; >>
E1 -> E2 << E2 -> E3 << $$ = $1; >>
$$ = $1; E2 -> E2 times E3 << $$ = $1 * $3; >>
>> E3 -> E4 << $$ = $1; >>
E1 -> E1 plus E2 <<
$$ = $1 + $3;
>>
E2 -> E3 <<
$$ = $1;
>>
E2 -> E2 times E3 <<
$$ = $1 * $3;
>>
E3 -> E4 <<
$$ = $1;
>>
E3 -> E3 power E4 << E3 -> E3 power E4 <<
$$ = pow($1, $3); $$ = pow($1, $3);
>> >>
E4 -> integer << E4 -> integer << $$ = $1; >>
$$ = $1; E4 -> lparen E1 rparen << $$ = $2; >>
>>
E4 -> lparen E1 rparen <<
$$ = $2;
>>
``` ```
Grammar files can contain comment lines beginning with `#` which are ignored. Grammar files can contain comment lines beginning with `#` which are ignored.