comparison: ltp/template.lua
ltp/template.lua
- changeset 3
- b2df1b3f2c83
- child 6
- 219d7a7304f8
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| 2:3975fa5ed630 | 3:b2df1b3f2c83 |
|---|---|
| 1 -- | |
| 2 -- Copyright 2007-2008 Savarese Software Research Corporation. | |
| 3 -- | |
| 4 -- Licensed under the Apache License, Version 2.0 (the "License"); | |
| 5 -- you may not use this file except in compliance with the License. | |
| 6 -- You may obtain a copy of the License at | |
| 7 -- | |
| 8 -- http://www.savarese.com/software/ApacheLicense-2.0 | |
| 9 -- | |
| 10 -- Unless required by applicable law or agreed to in writing, software | |
| 11 -- distributed under the License is distributed on an "AS IS" BASIS, | |
| 12 -- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| 13 -- See the License for the specific language governing permissions and | |
| 14 -- limitations under the License. | |
| 15 -- | |
| 16 | |
| 17 local ltp = require('ltp.util') | |
| 18 | |
| 19 local function compile_template_to_table(result, data, start_lua, end_lua) | |
| 20 local LF, CR, EQ = 10, 13, 61 | |
| 21 local i1, i2, i3 | |
| 22 | |
| 23 i3 = 1 | |
| 24 | |
| 25 repeat | |
| 26 i2, i1 = data:find(start_lua, i3, true) | |
| 27 | |
| 28 if i2 then | |
| 29 if i3 < i2 then | |
| 30 table.insert(result, "table.insert(output,") | |
| 31 table.insert(result, string.format('%q', data:sub(i3, i2 - 1))) | |
| 32 table.insert(result, ");") | |
| 33 end | |
| 34 | |
| 35 i1 = i1 + 2 | |
| 36 i2, i3 = data:find(end_lua, i1, true) | |
| 37 | |
| 38 if i2 then | |
| 39 if data:byte(i1-1) == EQ then | |
| 40 table.insert(result, "table.insert(output,") | |
| 41 table.insert(result, data:sub(i1, i2 - 1)) | |
| 42 table.insert(result, ");") | |
| 43 i3 = i3 + 1 | |
| 44 else | |
| 45 table.insert(result, data:sub(i1, i2 - 1)) | |
| 46 i3 = i3 + 1 | |
| 47 if data:byte(i3) == LF then | |
| 48 i3 = i3 + 1 | |
| 49 elseif data:byte(i3) == CR and data:byte(i3+1) == LF then | |
| 50 i3 = i3 + 2 | |
| 51 end | |
| 52 end | |
| 53 end | |
| 54 elseif i3 <= #data then | |
| 55 table.insert(result, "table.insert(output,") | |
| 56 table.insert(result, string.format('%q', data:sub(i3))) | |
| 57 table.insert(result, ");") | |
| 58 end | |
| 59 until not i2 | |
| 60 | |
| 61 return result | |
| 62 end | |
| 63 | |
| 64 local function compile_template_as_function(data, start_lua, end_lua) | |
| 65 local result = { "return function(output) " } | |
| 66 table.insert(compile_template_to_table(result, data, start_lua, end_lua), | |
| 67 "end") | |
| 68 return table.concat(result) | |
| 69 end | |
| 70 | |
| 71 local function compile_template(data, start_lua, end_lua) | |
| 72 return | |
| 73 table.concat(compile_template_to_table({ }, data, start_lua, end_lua)) | |
| 74 end | |
| 75 | |
| 76 local function load_template(data, start_lua, end_lua) | |
| 77 return | |
| 78 assert(loadstring(compile_template_as_function(data, start_lua, end_lua), | |
| 79 "=(load)"))() | |
| 80 end | |
| 81 | |
| 82 local function execute_template(template, environment, output) | |
| 83 setfenv(template, environment)(output) | |
| 84 end | |
| 85 | |
| 86 local function basic_environment(merge_global, environment) | |
| 87 if not environment then | |
| 88 environment = { } | |
| 89 end | |
| 90 | |
| 91 if merge_global then | |
| 92 ltp.merge_index(environment, _G) | |
| 93 else | |
| 94 environment.table = table | |
| 95 end | |
| 96 | |
| 97 return environment | |
| 98 end | |
| 99 | |
| 100 local function load_environment(env_files, merge_global) | |
| 101 local environment = nil | |
| 102 | |
| 103 if env_files and #env_files > 0 then | |
| 104 for i = 1,#env_files,1 do | |
| 105 local efun = assert(loadfile(env_files[i])) | |
| 106 | |
| 107 if i > 1 then | |
| 108 environment = ltp.merge_table(setfenv(efun, environment)(), environment) | |
| 109 else | |
| 110 environment = basic_environment(merge_global, efun()) | |
| 111 end | |
| 112 end | |
| 113 else | |
| 114 environment = basic_environment(merge_global) | |
| 115 end | |
| 116 | |
| 117 return environment | |
| 118 end | |
| 119 | |
| 120 local function read_template(template) | |
| 121 return ((template == "-" and io.stdin:read("*a")) or ltp.read_all(template)) | |
| 122 end | |
| 123 | |
| 124 local function render_template(template_data, start_lua, end_lua, environment) | |
| 125 local rfun = load_template(template_data, start_lua, end_lua) | |
| 126 local output = { } | |
| 127 execute_template(rfun, environment, output) | |
| 128 return table.concat(output) | |
| 129 end | |
| 130 | |
| 131 local function execute_env_code(env_code, environment) | |
| 132 for i = 1,#env_code do | |
| 133 local fun, emsg = loadstring(env_code[i]) | |
| 134 | |
| 135 if fun then | |
| 136 setfenv(fun, environment)() | |
| 137 else | |
| 138 error("error loading " .. env_code[i] .. "\n" .. emsg) | |
| 139 end | |
| 140 end | |
| 141 end | |
| 142 | |
| 143 local function render(outfile, num_passes, template, merge_global, | |
| 144 env_files, start_lua, end_lua, env_code) | |
| 145 local data = assert(read_template(template), "error reading " .. template) | |
| 146 local environment = load_environment(env_files, merge_global) | |
| 147 | |
| 148 execute_env_code(env_code, environment) | |
| 149 | |
| 150 if num_passes > 0 then | |
| 151 for i = 1,num_passes do | |
| 152 data = render_template(data, start_lua, end_lua, environment) | |
| 153 end | |
| 154 else | |
| 155 -- Prevent an infinite loop by capping expansion to 100 times. | |
| 156 num_passes = 1 | |
| 157 repeat | |
| 158 data = render_template(data, start_lua, end_lua, environment) | |
| 159 num_passes = num_passes + 1 | |
| 160 until data:find(start_lua, 1, true) == nil or num_passes >= 100 | |
| 161 end | |
| 162 | |
| 163 outfile:write(data); | |
| 164 end | |
| 165 | |
| 166 local function compile_as_function(outfile, template, start_lua, end_lua) | |
| 167 local data = read_template(template) | |
| 168 outfile:write(compile_template_as_function(data, start_lua, end_lua)) | |
| 169 end | |
| 170 | |
| 171 local function compile(outfile, template, start_lua, end_lua) | |
| 172 local data = read_template(template) | |
| 173 outfile:write(compile_template(data, start_lua, end_lua)) | |
| 174 end | |
| 175 | |
| 176 return ltp.merge_table( | |
| 177 { | |
| 178 compile_template_to_table = compile_template_to_table, | |
| 179 compile_template_as_function = compile_template_as_function, | |
| 180 compile_template = compile_template, | |
| 181 load_template = load_template, | |
| 182 execute_template = execute_template, | |
| 183 basic_environment = basic_environment, | |
| 184 load_environment = load_environment, | |
| 185 render_template = render_template, | |
| 186 execute_env_code = execute_env_code, | |
| 187 render = render, | |
| 188 compile_as_function = compile_as_function, | |
| 189 compile = compile | |
| 190 }, | |
| 191 ltp | |
| 192 ) |
