92 lines
3.5 KiB
Plaintext
92 lines
3.5 KiB
Plaintext
#!/usr/bin/env nomsu -V4.8.10
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# This file contains the parser, which converts text into abstract syntax trees
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#use "nomonom/ast.nom"
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%lpeg = (=lua "require('lpeg')")
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%re = (=lua "require('re')")
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call %lpeg.setmaxstack with [20000]
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set {..}
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((P 1)'s meaning):%lpeg.P, ((R 1)'s meaning):%lpeg.R
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((Carg 1)'s meaning):%lpeg.Carg, ((S 1)'s meaning):%lpeg.S
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((Cc 1)'s meaning):%lpeg.Cc, ((lpeg re pattern 1)'s meaning):%re.compile
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((lpeg re pattern 1 using 2)'s meaning):%re.compile
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((lpeg pattern 1's match of 2)'s meaning):%lpeg.match
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((lpeg pattern 1's match of 2 with 3)'s meaning): (..)
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[%1, %2, %3] -> (call %lpeg.match with [%1, %2, nil, %3])
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%source_code_for_tree = {}
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%defs = (..)
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{..}
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nl: (P "\r")^(-1) * (P "\n")
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tab: P "\t"
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tonumber: %tonumber
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tochar: %string.char
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unpack: %unpack
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nil: Cc (nil)
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userdata: Carg 1
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utf8_char: (..)
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(R "\194\223")*(R "\128\191") +
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..(R "\224\239")*(R "\128\191")*(R "\128\191") +
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..(R "\240\244")*(R "\128\191")*(R "\128\191")*(R "\128\191")
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Tree: [%t, %userdata] ->:
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%source = (..)
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Source {filename:%userdata.filename, start:%t.start, stop:%t.stop}
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set {%t.start: nil, %t.stop: nil, %t.source: %source}
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%t = (a Syntax Tree with %t)
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(Syntax Tree).source_code_for_tree.%t = %userdata.source
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return %t
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..with fallback %key ->:
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if:
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(%key::matches "^ascii_(%d+)$"):
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%i = (%key::matching "^ascii_(%d+)$")
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return (call %string.char with [%i as a number])
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(%key::matches "^number_(%d+)$"):
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%i = (%key::matching "^number_(%d+)$")
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return (Cc (%i as a number))
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%id_patt = (..)
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((P "") - (R "09")) * (..)
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(%defs.utf8_char + (R "az") + (R "AZ") + (P "_") + (R "09")) ^ 1 * -1
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%operator_patt = ((S "'`~!@$^&*+=|<>?/-") ^ 1 * -1)
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externally [%text is a nomsu id, %text is a nomsu identifier] all mean (..)
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lpeg pattern %id_patt's match of %text
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externally (%text is a nomsu operator) means (..)
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lpeg pattern %operator_patt's match of %text
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%peg_tidier = (..)
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lpeg re pattern "\
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..file <- %nl* {~ (def/comment) (%nl+ (def/comment))* %nl* ~}
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def <- anon_def / captured_def
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anon_def <-
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({ident} (" "*) ":" {[^%nl]* (%nl+ " "+ [^%nl]*)*})
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-> "%1 <- %2"
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captured_def <-
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({ident} (" "*) "(" {ident} ")" (" "*) ":" {[^%nl]* (%nl+ " "+ [^%nl]*)*})
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-> "%1 <- ({| {:start:{}:} %3 {:stop:{}:} {:type: (''->'%2') :} |} %%userdata) -> Tree"
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ident <- [a-zA-Z_][a-zA-Z0-9_]*
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comment <- "--" [^%nl]*
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"
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externally (make parser from %peg) means (make parser from %peg using (nil))
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externally (make parser from %peg using %make_tree) means:
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%peg = (lpeg pattern %peg_tidier's match of %peg)
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%peg = (lpeg re pattern %peg using %defs)
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(%input from %filename parsed) means:
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%input = "\%input"
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%tree_mt = {__index:{source:%input, filename:%filename}}
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%userdata = {..}
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make_tree:%make_tree or ([%] -> (: set %'s metatable to %tree_mt; return %))
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filename:%filename, source:%input
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%tree = (lpeg pattern %peg's match of %input with %userdata)
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assume %tree or barf "\
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..File \%filename failed to parse:
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\%input"
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return %tree
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return ((1 from 2 parsed)'s meaning)
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