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-rw-r--r--stdlib/source/lux/compiler/default/syntax.lux188
-rw-r--r--stdlib/source/lux/data/text/lexer.lux2
2 files changed, 71 insertions, 119 deletions
diff --git a/stdlib/source/lux/compiler/default/syntax.lux b/stdlib/source/lux/compiler/default/syntax.lux
index 322035fd8..ca715e8dd 100644
--- a/stdlib/source/lux/compiler/default/syntax.lux
+++ b/stdlib/source/lux/compiler/default/syntax.lux
@@ -46,8 +46,14 @@
(type: #export Aliases (Dictionary Text Text))
(def: #export no-aliases Aliases (dictionary.new text.Hash<Text>))
+(def: digits "0123456789")
+(def: digits+ (format "_" ..digits))
+
(def: white-space Text "\t\v \r\f")
(def: new-line Text "\n")
+(def: new-line^ (l.this new-line))
+
+(def: text-delimiter^ (l.this "\""))
## This is the parser for white-space.
## Whenever a new-line is encountered, the column gets reset to 0, and
@@ -55,41 +61,41 @@
## It operates recursively in order to produce the longest continuous
## chunk of white-space.
(def: (space^ where)
- (-> Cursor (Lexer [Cursor Any]))
+ (-> Cursor (Lexer Cursor))
(p.either (do p.Monad<Parser>
[content (l.many! (l.one-of! white-space))]
- (wrap [(update@ #.column (n/+ (get@ #l.distance content)) where)
- []]))
+ (wrap (update@ #.column (n/+ (get@ #l.distance content)) where)))
## New-lines must be handled as a separate case to ensure line
## information is handled properly.
(do p.Monad<Parser>
[content (l.many! (l.one-of! new-line))]
- (wrap [(|> where
- (update@ #.line (n/+ (get@ #l.distance content)))
- (set@ #.column 0))
- []]))))
+ (wrap (|> where
+ (update@ #.line (n/+ (get@ #l.distance content)))
+ (set@ #.column 0))))))
## Single-line comments can start anywhere, but only go up to the
## next new-line.
(def: (single-line-comment^ where)
- (-> Cursor (Lexer [Cursor Text]))
+ (-> Cursor (Lexer Cursor))
(do p.Monad<Parser>
[_ (l.this "##")
- comment (l.slice (l.some! (l.none-of! new-line)))
- _ (l.this new-line)]
- (wrap [(|> where
- (update@ #.line inc)
- (set@ #.column 0))
- comment])))
+ _ (l.some! (l.none-of! new-line))
+ _ ..new-line^]
+ (wrap (|> where
+ (update@ #.line inc)
+ (set@ #.column 0)))))
## This is just a helper parser to find text which doesn't run into
## any special character sequences for multi-line comments.
-(def: comment-bound^
+(def: multi-line-comment-start^ (l.this "#("))
+(def: multi-line-comment-end^ (l.this ")#"))
+
+(def: multi-line-comment-bound^
(Lexer Any)
($_ p.either
- (l.this new-line)
- (l.this ")#")
- (l.this "#(")))
+ ..new-line^
+ ..multi-line-comment-start^
+ ..multi-line-comment-end^))
## Multi-line comments are bounded by #( these delimiters, #(and, they may
## also be nested)# )#.
@@ -97,24 +103,21 @@
## That is, any nested comment must have matched delimiters.
## Unbalanced comments ought to be rejected as invalid code.
(def: (multi-line-comment^ where)
- (-> Cursor (Lexer [Cursor Text]))
+ (-> Cursor (Lexer Cursor))
(do p.Monad<Parser>
- [_ (l.this "#(")]
- (loop [comment ""
- where (update@ #.column (n/+ 2) where)]
+ [_ ..multi-line-comment-start^]
+ (loop [where (update@ #.column (n/+ 2) where)]
($_ p.either
## These are normal chunks of commented text.
(do @
- [chunk (l.many (l.not comment-bound^))]
- (recur (format comment chunk)
- (|> where
- (update@ #.column (n/+ (text.size chunk))))))
+ [chunk (l.many! (l.not! multi-line-comment-bound^))]
+ (recur (|> where
+ (update@ #.column (n/+ (get@ #l.distance chunk))))))
## This is a special rule to handle new-lines within
## comments properly.
(do @
- [_ (l.this new-line)]
- (recur (format comment new-line)
- (|> where
+ [_ ..new-line^]
+ (recur (|> where
(update@ #.line inc)
(set@ #.column 0))))
## This is the rule for handling nested sub-comments.
@@ -124,14 +127,12 @@
## That is why the sub-comment is covered in delimiters
## and then appended to the rest of the comment text.
(do @
- [[sub-where sub-comment] (multi-line-comment^ where)]
- (recur (format comment "#(" sub-comment ")#")
- sub-where))
+ [sub-where (multi-line-comment^ where)]
+ (recur sub-where))
## Finally, this is the rule for closing the comment.
(do @
- [_ (l.this ")#")]
- (wrap [(update@ #.column (n/+ 2) where)
- comment]))
+ [_ ..multi-line-comment-end^]
+ (wrap (update@ #.column (n/+ 2) where)))
))))
## This is the only parser that should be used directly by other
@@ -141,11 +142,11 @@
## from being used in any situation (alternatively, forcing one type
## of comment to be the only usable one).
(def: (comment^ where)
- (-> Cursor (Lexer [Cursor Text]))
+ (-> Cursor (Lexer Cursor))
(p.either (single-line-comment^ where)
(multi-line-comment^ where)))
-## To simplify parsing, I remove any left-padding that an Code token
+## To simplify parsing, I remove any left-padding that a Code token
## may have prior to parsing the token itself.
## Left-padding is assumed to be either white-space or a comment.
## The cursor gets updated, but the padding gets ignored.
@@ -153,10 +154,10 @@
(-> Cursor (Lexer Cursor))
($_ p.either
(do p.Monad<Parser>
- [[where comment] (comment^ where)]
+ [where (comment^ where)]
(left-padding^ where))
(do p.Monad<Parser>
- [[where _] (space^ where)]
+ [where (space^ where)]
(left-padding^ where))
(:: p.Monad<Parser> wrap where)))
@@ -187,7 +188,7 @@
[code (l.between 1 4 l.hexadecimal)]
(wrap (case (:: number.Hex@Codec<Text,Nat> decode code)
(#.Right value)
- [(n/+ 2 (text.size code)) (text.from-code value)]
+ [("lux i64 +" 2 (text.size code)) (text.from-code value)]
_
(undefined))))
@@ -233,32 +234,7 @@
number.Codec<Text,Rev>]
)
-(def: (nat-char where)
- (-> Cursor (Lexer [Cursor Code]))
- (do p.Monad<Parser>
- [_ (l.this "#\"")
- [where' char] (: (Lexer [Cursor Text])
- ($_ p.either
- ## Normal text characters.
- (do @
- [normal (l.none-of "\\\"\n")]
- (wrap [(|> where
- (update@ #.column inc))
- normal]))
- ## Must handle escaped
- ## chars separately.
- (do @
- [[chars-consumed char] escaped-char^]
- (wrap [(|> where
- (update@ #.column (n/+ chars-consumed)))
- char]))))
- _ (l.this "\"")
- #let [char (maybe.assume (text.nth 0 char))]]
- (wrap [(|> where'
- (update@ #.column inc))
- [where (#.Nat char)]])))
-
-(def: (normal-nat where)
+(def: #export (nat where)
(-> Cursor (Lexer [Cursor Code]))
(do p.Monad<Parser>
[chunk rich-digits^]
@@ -270,11 +246,6 @@
(wrap [(update@ #.column (n/+ (text.size chunk)) where)
[where (#.Nat value)]]))))
-(def: #export (nat where)
- (-> Cursor (Lexer [Cursor Code]))
- (p.either (normal-nat where)
- (nat-char where)))
-
(def: (normal-frac where)
(-> Cursor (Lexer [Cursor Code]))
(do p.Monad<Parser>
@@ -299,8 +270,8 @@
(def: frac-ratio-fragment
(Lexer Frac)
(<| (p.codec number.Codec<Text,Frac>)
- (:: p.Monad<Parser> map (function (_ digits)
- (format digits ".0")))
+ (parser/map (function (_ digits)
+ (format digits ".0")))
rich-digits^))
(def: (ratio-frac where)
@@ -337,7 +308,7 @@
(do p.Monad<Parser>
[## Lux text "is delimited by double-quotes", as usual in most
## programming languages.
- _ (l.this "\"")
+ _ ..text-delimiter^
## I must know what column the text body starts at (which is
## always 1 column after the left-delimiting quote).
## This is important because, when procesing subsequent lines,
@@ -364,43 +335,28 @@
## the text's body's column,
## to ensure they are aligned.
(do @
- [offset (l.slice (l.many! (l.one-of! " ")))
- #let [offset-size (text.size offset)]]
- (if (n/>= offset-column offset-size)
- ## Any extra offset
- ## becomes part of the
- ## text's body.
- (recur (|> offset
- (text.split offset-column)
- (maybe.default (undefined))
- product.right
- (format text-read))
- (|> where
- (update@ #.column (n/+ offset-size)))
- #0)
- (p.fail (format "Each line of a multi-line text must have an appropriate offset!\n"
- "Expected: " (%i (.int offset-column)) " columns.\n"
- " Actual: " (%i (.int offset-size)) " columns.\n"))))
+ [_ (l.exactly! offset-column (l.one-of! " "))]
+ (recur text-read
+ (update@ #.column (n/+ offset-column) where)
+ #0))
($_ p.either
## Normal text characters.
(do @
[normal (l.slice (l.many! (l.none-of! "\\\"\n")))]
(recur (format text-read normal)
- (|> where
- (update@ #.column (n/+ (text.size normal))))
+ (update@ #.column (n/+ (text.size normal)) where)
#0))
## Must handle escaped
## chars separately.
(do @
[[chars-consumed char] escaped-char^]
(recur (format text-read char)
- (|> where
- (update@ #.column (n/+ chars-consumed)))
+ (update@ #.column (n/+ chars-consumed) where)
#0))
## The text ends when it
## reaches the right-delimiter.
(do @
- [_ (l.this "\"")]
+ [_ ..text-delimiter^]
(wrap [(update@ #.column inc where)
text-read]))))
## If a new-line is
@@ -409,7 +365,7 @@
## the loop is alerted that the
## next line must have an offset.
(do @
- [_ (l.this new-line)]
+ [_ ..new-line^]
(recur (format text-read new-line)
(|> where
(update@ #.line inc)
@@ -507,15 +463,11 @@
## a digit, to avoid confusion with regards to numbers.
(def: name-part^
(Lexer Text)
- (do p.Monad<Parser>
- [#let [digits "0123456789"
- delimiters (format "()[]{}#\"" name-separator)
- space (format white-space new-line)
- head-lexer (l.slice (l.none-of! (format digits delimiters space)))
- tail-lexer (l.slice (l.some! (l.none-of! (format delimiters space))))]
- head head-lexer
- tail tail-lexer]
- (wrap (format head tail))))
+ (let [delimiters (format "()[]{}#\"" name-separator)
+ space (format white-space new-line)
+ head (l.none-of! (format ..digits delimiters space))
+ tail (l.some! (l.none-of! (format delimiters space)))]
+ (l.slice (l.and! head tail))))
(def: current-module-mark Text (format name-separator name-separator))
@@ -530,7 +482,7 @@
[_ (l.this current-module-mark)
def-name name-part^]
(wrap [[current-module def-name]
- (n/+ 2 (text.size def-name))]))
+ ("lux i64 +" 2 (text.size def-name))]))
## If the name is prefixed by the mark, but no module
## part, the module is assumed to be "lux" (otherwise known as
## the 'prelude').
@@ -558,7 +510,7 @@
second-part name-part^]
(wrap [[(|> aliases (dictionary.get first-part) (maybe.default first-part))
second-part]
- ($_ n/+
+ ($_ "lux i64 +"
(text.size first-part)
1
(text.size second-part))]))
@@ -571,17 +523,17 @@
(do p.Monad<Parser>
[[value length] (<| <pre>
(name^ current-module aliases))]
- (wrap [(update@ #.column (|>> (n/+ <length>)) where)
+ (wrap [(update@ #.column (n/+ <length>) where)
[where (<tag> value)]])))]
- [tag (p.after (l.this "#")) #.Tag (n/+ 1 length)]
+ [tag (p.after (l.this "#")) #.Tag ("lux i64 +" 1 length)]
[identifier (|>) #.Identifier length]
)
(do-template [<name> <value>]
[(def: <name>
(Lexer Bit)
- (:: p.Monad<Parser> map (function.constant <value>) (l.this (%b <value>))))]
+ (parser/map (function.constant <value>) (l.this (%b <value>))))]
[false #0]
[true #1]
@@ -591,7 +543,7 @@
(-> Cursor (Lexer [Cursor Code]))
(do p.Monad<Parser>
[value (p.either ..false ..true)]
- (wrap [(update@ #.column (|>> (n/+ 2)) where)
+ (wrap [(update@ #.column (n/+ 2) where)
[where (#.Bit value)]])))
(exception: #export (end-of-file {module Text})
@@ -608,17 +560,17 @@
(do p.Monad<Parser>
[where (left-padding^ where)]
($_ p.either
- (..form where ast')
- (..tuple where ast')
- (..record where ast')
- (..text where)
+ (..bit where)
(..nat where)
(..frac where)
- (..int where)
(..rev where)
- (..bit where)
+ (..int where)
+ (..text where)
(..identifier current-module aliases where)
(..tag current-module aliases where)
+ (..form where ast')
+ (..tuple where ast')
+ (..record where ast')
(do @
[end? l.end?]
(if end?
diff --git a/stdlib/source/lux/data/text/lexer.lux b/stdlib/source/lux/data/text/lexer.lux
index 3b4b63a26..80e2cea0f 100644
--- a/stdlib/source/lux/data/text/lexer.lux
+++ b/stdlib/source/lux/data/text/lexer.lux
@@ -268,7 +268,7 @@
(do p.Monad<Parser>
[[left::basis left::distance] left
[right::basis right::distance] right]
- (wrap [left::basis (n/+ right::distance right::distance)])))
+ (wrap [left::basis (n/+ left::distance right::distance)])))
(do-template [<name> <base> <doc-modifier>]
[(def: #export (<name> lexer)
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-29 15:41:27 +0000