blob: 38a6a40d73f00ed675a692e47f930e04598a9adb (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
|
(ns lux.lexer
(:require [clojure.template :refer [do-template]]
(lux [base :as & :refer [exec return* return fail fail*]]
[reader :as &reader])
[lux.analyser.def :as &def]))
;; [Utils]
(defn ^:private escape-char [escaped]
(condp = escaped
"\\t" (return "\t")
"\\b" (return "\b")
"\\n" (return "\n")
"\\r" (return "\r")
"\\f" (return "\f")
"\\\"" (return "\"")
"\\\\" (return "\\")
;; else
(fail (str "[Lexer Error] Unknown escape character: " escaped))))
(defn ^:private lex-text-body [_____]
(&/try-all% (&/|list (exec [[_ [_ [prefix escaped]]] (&reader/read-regex2 #"(?s)^([^\"\\]*)(\\.)")
unescaped (escape-char escaped)
[_ [_ postfix]] (lex-text-body nil)]
(return (str prefix unescaped postfix)))
(exec [[_ [_ body]] (&reader/read-regex #"(?s)^([^\"\\]*)")]
(return body)))))
(def ^:private +ident-re+ #"^([a-zA-Z\-\+\_\=!@$%^&*<>\.,/\\\|'`:\~\?][0-9a-zA-Z\-\+\_\=!@$%^&*<>\.,/\\\|'`:\~\?]*)")
;; [Lexers]
(def ^:private lex-white-space
(exec [[_ [_ white-space]] (&reader/read-regex #"^(\s+)")]
(return (&/V "White_Space" white-space))))
(def ^:private lex-single-line-comment
(exec [_ (&reader/read-text "##")
[_ [_ comment]] (&reader/read-regex #"^([^\n]*)")
_ (&reader/read-regex #"^(\n?)")]
(return (&/V "Comment" comment))))
(def ^:private lex-multi-line-comment
(exec [_ (&reader/read-text "#(")
comment (&/try-all% (&/|list (exec [[_ [_ comment]] (&reader/read-regex #"(?is)^((?!#\().)*?(?=\)#)")]
(return comment))
(exec [[_ [_ pre]] (&reader/read-regex #"(?is)^(.+?(?=#\())")
[_ inner] lex-multi-line-comment
[_ [_ post]] (&reader/read-regex #"(?is)^(.+?(?=\)#))")]
(return (str pre "#(" inner ")#" post)))))
_ (&reader/read-text ")#")]
(return (&/V "Comment" comment))))
(def ^:private lex-comment
(&/try-all% (&/|list lex-single-line-comment
;; lex-multi-line-comment
)))
(do-template [<name> <tag> <regex>]
(def <name>
(exec [[_ [_ token]] (&reader/read-regex <regex>)]
(return (&/V <tag> token))))
^:private lex-bool "Bool" #"^(true|false)"
^:private lex-int "Int" #"^-?(0|[1-9][0-9]*)"
^:private lex-real "Real" #"^-?(0|[1-9][0-9]*)\.[0-9]+"
)
(def ^:private lex-char
(exec [_ (&reader/read-text "#\"")
token (&/try-all% (&/|list (exec [escaped (&reader/read-regex #"^(\\.)")]
(escape-char escaped))
(exec [[_ [_ char]] (&reader/read-regex #"^(.)")]
(return char))))
_ (&reader/read-text "\"")]
(return (&/V "Char" token))))
(def ^:private lex-text
(exec [_ (&reader/read-text "\"")
token (lex-text-body nil)
_ (&reader/read-text "\"")]
(return (&/V "Text" token))))
(def ^:private lex-ident
(&/try-all% (&/|list (exec [_ (&reader/read-text ";")
[_ [_ token]] (&reader/read-regex +ident-re+)
module-name &/get-module-name]
(return (&/T module-name token)))
(exec [[_ [_ token]] (&reader/read-regex +ident-re+)]
(&/try-all% (&/|list (exec [_ (&reader/read-text ";")
[_ [_ local-token]] (&reader/read-regex +ident-re+)]
(&/try-all% (&/|list (exec [unaliased (&def/unalias-module token)]
(return (&/T unaliased local-token)))
(exec [? (&def/module-exists? token)]
(if ?
(return (&/T token local-token))
(fail (str "[Lexer Error] Unknown module: " token))))
)))
(exec [module-name &/get-module-name]
(return (&/T module-name token))))))
)))
(def ^:private lex-symbol
(exec [ident lex-ident]
(return (&/V "Symbol" ident))))
(def ^:private lex-tag
(exec [_ (&reader/read-text "#")
ident lex-ident]
(return (&/V "Tag" ident))))
(do-template [<name> <text> <tag>]
(def <name>
(exec [_ (&reader/read-text <text>)]
(return (&/V <tag> nil))))
^:private lex-open-paren "(" "Open_Paren"
^:private lex-close-paren ")" "Close_Paren"
^:private lex-open-bracket "[" "Open_Bracket"
^:private lex-close-bracket "]" "Close_Bracket"
^:private lex-open-brace "{" "Open_Brace"
^:private lex-close-brace "}" "Close_Brace"
)
(def ^:private lex-delimiter
(&/try-all% (&/|list lex-open-paren
lex-close-paren
lex-open-bracket
lex-close-bracket
lex-open-brace
lex-close-brace)))
;; [Exports]
(def lex
(&/try-all% (&/|list lex-white-space
lex-comment
lex-bool
lex-real
lex-int
lex-char
lex-text
lex-symbol
lex-tag
lex-delimiter)))
|