nova-parser.lua
· 7.1 KiB · Lua
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local pprint = require "pprint"
local None = {}
local whitespace = {
[' '] = true,
['\n'] = true,
['\r'] = true,
['\t'] = true,
}
local yield, wrap = coroutine.yield, coroutine.wrap
local function gen(t)
return wrap(function()
for i, v in ipairs(t) do
yield(i, v)
end
end)
end
local function iter(f)
return function(arg)
return wrap(function () f(arg) end)
end
end
local function chars(string)
local cs = {}
for char in string:gmatch(".") do
table.insert(cs, char)
end
return cs
end
local function copy(t)
local t_copy = {}
for k, v in pairs(t) do
t_copy[k] = v
end
return t_copy
end
local function append(a, b)
local appended = {}
for _, v in ipairs(a) do
table.insert(appended, v)
end
for _, v in ipairs(b) do
table.insert(appended, v)
end
return appended
end
local function clear(t)
for k, v in pairs(t) do
t[k] = nil
end
end
local function insert(t, what)
table.insert(t, what)
return t
end
local parser_container = iter(function(string)
local left = {}
local right = {}
local target = left
local characters = gen(insert(chars(string), None))
local delimiter = None
for _, character in characters do
if not whitespace[character] then
delimiter = character
break
end
end
if delimiter == None then
return None
end
for _, character in characters do
if character == delimiter or character == None then
if target == left then
target = right
else
target = left
yield(copy(left), copy(right))
clear(left) clear(right)
end
else
table.insert(target, character)
end
end
end)
local parse_labels = iter(function(rules)
local left = {}
local right = {}
local pair = {{}, {}}
local target = left
local delimiter = None
for condition, result in rules do
for _, side in ipairs({condition, result}) do
local characters = gen(insert(side, None))
local state = "find delimiter"
for _, character in characters do
if character == None then
local label = table.concat(pair[1]):match "^%s*(.-)%s*$"
local pattern = table.concat(pair[2]):match "^%s*(.-)%s*$"
if not (#label == 0 and #pattern == 0) then
table.insert(target, {label, pattern})
end
clear(pair[1]) clear(pair[2])
break
elseif state == "find delimiter" then
if not whitespace[character] then
delimiter = character
state = "parse label"
end
elseif state == "parse label" then
if character == delimiter then
state = "parse pattern"
else
table.insert(pair[1], character)
end
elseif state == "parse pattern" then
if character == delimiter or character == None then
state = "parse label"
local label = table.concat(pair[1]):match "^%s*(.-)%s*$"
local pattern = table.concat(pair[2]):match "^%s*(.-)%s*$"
if not (#label == 0 and #pattern == 0) then
table.insert(target, {label, pattern})
end
clear(pair[1]) clear(pair[2])
else
table.insert(pair[2], character)
end
end
end
if target == left then
target = right
else
target = left
end
end
yield(copy(left), copy(right))
clear(left) clear(right)
end
end)
local parse_patterns = iter(function(rules)
for conditions, results in rules do
local left = {}
local right = {}
local preserves = {}
for _, condition in ipairs(conditions) do
local label, pattern = condition[1], condition[2]
local preserve = false
if pattern:match("%?$") then
pattern = pattern:sub(1, -2)
preserve = true
end
if pattern:match("^[\"'](.*)[\"']$") then
for i, character in ipairs(chars(pattern:match("^[\"'](.*)[\"\']$"))) do
table.insert(left, {label, {tostring(string.byte(character))}})
if preserves then
table.insert(right, {label, {tostring(string.byte(character))}})
end
end
elseif pattern:match("^%((.*)%)$") then
for token in pattern:match("^%((.*)%)$"):gmatch("%S+") do
table.insert(left, {label, {token}})
if preserve then
table.insert(right, {label, {token}})
end
end
elseif pattern:find("^%.") then
-- TODO
else
local words = {}
for word in pattern:gmatch("%S+") do
table.insert(words, word)
end
table.insert(left, {label, words})
if preserve then
table.insert(preserves, {label, words})
end
end
end
for _, result in ipairs(results) do
local label, pattern = result[1], result[2]
if pattern:match("^[\"'](.*)[\"']$") then
for i, character in ipairs(chars(pattern:match("^[\"'](.*)[\"\']$"))) do
table.insert(right, {label, {tostring(string.byte(character))}})
end
elseif pattern:match("^%((.*)%)$") then
for token in pattern:match("^%((.*)%)$"):gmatch("%S+") do
table.insert(right, {label, {token}})
end
elseif pattern:find("^%.") then
-- TODO
else
local words = {}
for word in pattern:gmatch("%S+") do
table.insert(words, word)
end
table.insert(right, {label, words})
end
end
yield(copy(left), append(right, preserves))
clear(left) clear(right) clear(preserves)
end
end)
local file = io.open("main.nv", "r")
for left, right in parse_patterns(parse_labels(parser_container(file:read("*a")))) do
io.write("|")
local left_pattern = {}
for _, pattern in ipairs(left) do
table.insert(left_pattern, ":" .. pattern[1] .. ": " .. table.concat(pattern[2], " "))
end
io.write(table.concat(left_pattern, " "))
io.write("|\n")
for _, pattern in ipairs(right) do
print("", ":" .. pattern[1] .. ": " .. table.concat(pattern[2], " "))
end
io.write("\n")
end
| 1 | local pprint = require "pprint" |
| 2 | local None = {} |
| 3 | local whitespace = { |
| 4 | [' '] = true, |
| 5 | ['\n'] = true, |
| 6 | ['\r'] = true, |
| 7 | ['\t'] = true, |
| 8 | } |
| 9 | local yield, wrap = coroutine.yield, coroutine.wrap |
| 10 | |
| 11 | local function gen(t) |
| 12 | return wrap(function() |
| 13 | for i, v in ipairs(t) do |
| 14 | yield(i, v) |
| 15 | end |
| 16 | end) |
| 17 | end |
| 18 | local function iter(f) |
| 19 | return function(arg) |
| 20 | return wrap(function () f(arg) end) |
| 21 | end |
| 22 | end |
| 23 | |
| 24 | local function chars(string) |
| 25 | local cs = {} |
| 26 | for char in string:gmatch(".") do |
| 27 | table.insert(cs, char) |
| 28 | end |
| 29 | return cs |
| 30 | end |
| 31 | |
| 32 | local function copy(t) |
| 33 | local t_copy = {} |
| 34 | for k, v in pairs(t) do |
| 35 | t_copy[k] = v |
| 36 | end |
| 37 | return t_copy |
| 38 | end |
| 39 | |
| 40 | local function append(a, b) |
| 41 | local appended = {} |
| 42 | for _, v in ipairs(a) do |
| 43 | table.insert(appended, v) |
| 44 | end |
| 45 | for _, v in ipairs(b) do |
| 46 | table.insert(appended, v) |
| 47 | end |
| 48 | return appended |
| 49 | end |
| 50 | |
| 51 | local function clear(t) |
| 52 | for k, v in pairs(t) do |
| 53 | t[k] = nil |
| 54 | end |
| 55 | end |
| 56 | |
| 57 | local function insert(t, what) |
| 58 | table.insert(t, what) |
| 59 | return t |
| 60 | end |
| 61 | |
| 62 | local parser_container = iter(function(string) |
| 63 | local left = {} |
| 64 | local right = {} |
| 65 | local target = left |
| 66 | local characters = gen(insert(chars(string), None)) |
| 67 | local delimiter = None |
| 68 | |
| 69 | for _, character in characters do |
| 70 | if not whitespace[character] then |
| 71 | delimiter = character |
| 72 | break |
| 73 | end |
| 74 | |
| 75 | end |
| 76 | if delimiter == None then |
| 77 | return None |
| 78 | end |
| 79 | |
| 80 | for _, character in characters do |
| 81 | if character == delimiter or character == None then |
| 82 | if target == left then |
| 83 | target = right |
| 84 | else |
| 85 | target = left |
| 86 | yield(copy(left), copy(right)) |
| 87 | clear(left) clear(right) |
| 88 | end |
| 89 | else |
| 90 | table.insert(target, character) |
| 91 | end |
| 92 | end |
| 93 | end) |
| 94 | |
| 95 | local parse_labels = iter(function(rules) |
| 96 | local left = {} |
| 97 | local right = {} |
| 98 | local pair = {{}, {}} |
| 99 | local target = left |
| 100 | local delimiter = None |
| 101 | for condition, result in rules do |
| 102 | for _, side in ipairs({condition, result}) do |
| 103 | local characters = gen(insert(side, None)) |
| 104 | local state = "find delimiter" |
| 105 | for _, character in characters do |
| 106 | if character == None then |
| 107 | local label = table.concat(pair[1]):match "^%s*(.-)%s*$" |
| 108 | local pattern = table.concat(pair[2]):match "^%s*(.-)%s*$" |
| 109 | if not (#label == 0 and #pattern == 0) then |
| 110 | table.insert(target, {label, pattern}) |
| 111 | end |
| 112 | clear(pair[1]) clear(pair[2]) |
| 113 | break |
| 114 | elseif state == "find delimiter" then |
| 115 | if not whitespace[character] then |
| 116 | delimiter = character |
| 117 | state = "parse label" |
| 118 | end |
| 119 | elseif state == "parse label" then |
| 120 | if character == delimiter then |
| 121 | state = "parse pattern" |
| 122 | else |
| 123 | table.insert(pair[1], character) |
| 124 | end |
| 125 | elseif state == "parse pattern" then |
| 126 | if character == delimiter or character == None then |
| 127 | state = "parse label" |
| 128 | local label = table.concat(pair[1]):match "^%s*(.-)%s*$" |
| 129 | local pattern = table.concat(pair[2]):match "^%s*(.-)%s*$" |
| 130 | if not (#label == 0 and #pattern == 0) then |
| 131 | table.insert(target, {label, pattern}) |
| 132 | end |
| 133 | clear(pair[1]) clear(pair[2]) |
| 134 | else |
| 135 | table.insert(pair[2], character) |
| 136 | end |
| 137 | end |
| 138 | end |
| 139 | if target == left then |
| 140 | target = right |
| 141 | else |
| 142 | target = left |
| 143 | end |
| 144 | end |
| 145 | yield(copy(left), copy(right)) |
| 146 | clear(left) clear(right) |
| 147 | end |
| 148 | end) |
| 149 | |
| 150 | local parse_patterns = iter(function(rules) |
| 151 | for conditions, results in rules do |
| 152 | local left = {} |
| 153 | local right = {} |
| 154 | local preserves = {} |
| 155 | for _, condition in ipairs(conditions) do |
| 156 | local label, pattern = condition[1], condition[2] |
| 157 | local preserve = false |
| 158 | if pattern:match("%?$") then |
| 159 | pattern = pattern:sub(1, -2) |
| 160 | preserve = true |
| 161 | end |
| 162 | if pattern:match("^[\"'](.*)[\"']$") then |
| 163 | for i, character in ipairs(chars(pattern:match("^[\"'](.*)[\"\']$"))) do |
| 164 | table.insert(left, {label, {tostring(string.byte(character))}}) |
| 165 | if preserves then |
| 166 | table.insert(right, {label, {tostring(string.byte(character))}}) |
| 167 | end |
| 168 | end |
| 169 | elseif pattern:match("^%((.*)%)$") then |
| 170 | for token in pattern:match("^%((.*)%)$"):gmatch("%S+") do |
| 171 | table.insert(left, {label, {token}}) |
| 172 | if preserve then |
| 173 | table.insert(right, {label, {token}}) |
| 174 | end |
| 175 | end |
| 176 | elseif pattern:find("^%.") then |
| 177 | -- TODO |
| 178 | else |
| 179 | local words = {} |
| 180 | for word in pattern:gmatch("%S+") do |
| 181 | table.insert(words, word) |
| 182 | end |
| 183 | table.insert(left, {label, words}) |
| 184 | if preserve then |
| 185 | table.insert(preserves, {label, words}) |
| 186 | end |
| 187 | end |
| 188 | end |
| 189 | |
| 190 | for _, result in ipairs(results) do |
| 191 | local label, pattern = result[1], result[2] |
| 192 | |
| 193 | if pattern:match("^[\"'](.*)[\"']$") then |
| 194 | for i, character in ipairs(chars(pattern:match("^[\"'](.*)[\"\']$"))) do |
| 195 | table.insert(right, {label, {tostring(string.byte(character))}}) |
| 196 | end |
| 197 | elseif pattern:match("^%((.*)%)$") then |
| 198 | for token in pattern:match("^%((.*)%)$"):gmatch("%S+") do |
| 199 | table.insert(right, {label, {token}}) |
| 200 | end |
| 201 | elseif pattern:find("^%.") then |
| 202 | -- TODO |
| 203 | else |
| 204 | local words = {} |
| 205 | for word in pattern:gmatch("%S+") do |
| 206 | table.insert(words, word) |
| 207 | end |
| 208 | table.insert(right, {label, words}) |
| 209 | end |
| 210 | end |
| 211 | |
| 212 | yield(copy(left), append(right, preserves)) |
| 213 | clear(left) clear(right) clear(preserves) |
| 214 | end |
| 215 | end) |
| 216 | |
| 217 | local file = io.open("main.nv", "r") |
| 218 | for left, right in parse_patterns(parse_labels(parser_container(file:read("*a")))) do |
| 219 | io.write("|") |
| 220 | local left_pattern = {} |
| 221 | for _, pattern in ipairs(left) do |
| 222 | table.insert(left_pattern, ":" .. pattern[1] .. ": " .. table.concat(pattern[2], " ")) |
| 223 | end |
| 224 | io.write(table.concat(left_pattern, " ")) |
| 225 | io.write("|\n") |
| 226 | for _, pattern in ipairs(right) do |
| 227 | print("", ":" .. pattern[1] .. ": " .. table.concat(pattern[2], " ")) |
| 228 | end |
| 229 | io.write("\n") |
| 230 | end |