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db4
Slava Pestov 2008-07-20 01:13:36 -05:00
parent b48aca89a6
commit 40d94ad60d
2 changed files with 16 additions and 10 deletions
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24
extra/fry/fry-docs.factor
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@ -19,10 +19,11 @@ HELP: fry
HELP: '[
{ $syntax "code... ]" }
{ $description "Literal fried quotation. Expands into code which takes values from the stack and substituting them in." } ;
{ $description "Literal fried quotation. Expands into code which takes values from the stack and substitutes them in place of the fry specifiers " { $link , } " and " { $link @ } "." }
{ $examples "See " { $link "fry.examples" } "." } ;
ARTICLE: "fry.examples" "Examples of fried quotations"
"Conceptually, " { $link fry } " is tricky however the general idea is easy to grasp once presented with examples."
"The easiest way to understand fried quotations is to look at some examples."
$nl
"If a quotation does not contain any fry specifiers, then " { $link POSTPONE: '[ } " behaves just like " { $link POSTPONE: [ } ":"
{ $code "{ 10 20 30 } '[ . ] each" }
@ -38,9 +39,10 @@ $nl
"{ 10 20 30 } 5 [ 3 ] swap [ / ] curry compose map"
"{ 10 20 30 } [ 3 5 / ] map"
}
"Occurrences of " { $link @ } " are simply syntax sugar for " { $snippet ", call" } ". The following three lines are equivalent:"
"Occurrences of " { $link @ } " are simply syntax sugar for " { $snippet ", call" } ". The following four lines are equivalent:"
{ $code
"{ 10 20 30 } [ sq ] '[ @ . ] each"
"{ 10 20 30 } [ sq ] [ call . ] curry each"
"{ 10 20 30 } [ sq ] [ . ] compose each"
"{ 10 20 30 } [ sq . ] each"
}
@ -50,16 +52,17 @@ $nl
"{ 8 13 14 27 } [ even? ] 5 [ dup ] swap [ ? ] curry 3compose map"
"{ 8 13 14 27 } [ even? dup 5 ? ] map"
}
"Occurrences of " { $link _ } " have the effect of enclosing all code to their left with " { $link >r } " and " { $link r> } ":"
"Occurrences of " { $link _ } " have the effect of enclosing all code to their left in a quotation passed to " { $link dip } ". The following four lines are equivalent:"
{ $code
"{ 10 20 30 } 1 '[ , _ / ] map"
"{ 10 20 30 } 1 [ [ ] curry dip / ] curry map"
"{ 10 20 30 } 1 [ swap / ] curry map"
"{ 10 20 30 } [ 1 swap / ] map"
}
"For any quotation body " { $snippet "X" } ", the following two are equivalent:"
{ $code
"[ >r X r> ]"
"[ X _ ]"
"[ [ X ] dip ]"
"'[ X _ ]"
}
"Here are some built-in combinators rewritten in terms of fried quotations:"
{ $table
@ -73,8 +76,11 @@ $nl
} ;
ARTICLE: "fry.philosophy" "Fried quotation philosophy"
"Fried quotations generalize quotation-building words such as " { $link curry } " and " { $link compose } "."
$nl
"Fried quotations generalize quotation-building words such as " { $link curry } " and " { $link compose } ". They can clean up code with lots of currying and composition, particularly when quotations are nested:"
{ $code
"'[ [ , key? ] all? ] filter"
"[ [ key? ] curry all? ] curry filter"
}
"There is a mapping from fried quotations to lexical closures as defined in the " { $vocab-link "locals" } " vocabulary. Namely, a fried quotation is equivalent to a ``let'' form where each local binding is only used once, and bindings are used in the same order in which they are defined. The following two lines are equivalent:"
{ $code
"'[ 3 , + 4 , / ]"
@ -87,7 +93,7 @@ $nl
} ;
ARTICLE: "fry.limitations" "Fried quotation limitations"
"As with " { $vocab-link "locals" } ", fried quotations cannot contain " { $link >r } " and " { $link r> } "." ;
"As with " { $vocab-link "locals" } ", fried quotations cannot contain " { $link >r } " and " { $link r> } ". This is not a real limitation in practice, since " { $link dip } " can be used instead." ;
ARTICLE: "fry" "Fried quotations"
"A " { $emphasis "fried quotation" } " differs from a literal quotation in that when it is evaluated, instead of just pushing itself on the stack, it consumes zero or more stack values and inserts them into the quotation."

2
extra/help/handbook/handbook.factor
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@ -137,7 +137,7 @@ ARTICLE: "collections" "Collections"
{ $subsection "heaps" }
{ $subsection "graphs" }
{ $subsection "buffers" }
"There are many other collections in " { $snippet "extra/" } ", such as " { $vocab-link "disjoint-set" } ", " { $vocab-link "persistent-vectors" } ", and " { $vocab-link "tuple-arrays" } "." ;
"There are many other collections in " { $snippet "extra/" } ", such as " { $vocab-link "disjoint-sets" } ", " { $vocab-link "persistent-vectors" } ", and " { $vocab-link "tuple-arrays" } "." ;
USING: io.encodings.utf8 io.encodings.utf16 io.encodings.binary io.encodings.ascii io.files ;