| paul@0 | 1 | #!/usr/bin/env python |
| paul@0 | 2 | |
| paul@0 | 3 | """ |
| paul@0 | 4 | Encoder functions, producing representations of program objects. |
| paul@0 | 5 | |
| paul@0 | 6 | Copyright (C) 2016 Paul Boddie <paul@boddie.org.uk> |
| paul@0 | 7 | |
| paul@0 | 8 | This program is free software; you can redistribute it and/or modify it under |
| paul@0 | 9 | the terms of the GNU General Public License as published by the Free Software |
| paul@0 | 10 | Foundation; either version 3 of the License, or (at your option) any later |
| paul@0 | 11 | version. |
| paul@0 | 12 | |
| paul@0 | 13 | This program is distributed in the hope that it will be useful, but WITHOUT |
| paul@0 | 14 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS |
| paul@0 | 15 | FOR A PARTICULAR PURPOSE. See the GNU General Public License for more |
| paul@0 | 16 | details. |
| paul@0 | 17 | |
| paul@0 | 18 | You should have received a copy of the GNU General Public License along with |
| paul@0 | 19 | this program. If not, see <http://www.gnu.org/licenses/>. |
| paul@0 | 20 | """ |
| paul@0 | 21 | |
| paul@56 | 22 | from common import first |
| paul@56 | 23 | |
| paul@0 | 24 | # Output encoding and decoding for the summary files. |
| paul@0 | 25 | |
| paul@0 | 26 | def encode_attrnames(attrnames): |
| paul@0 | 27 | |
| paul@0 | 28 | "Encode the 'attrnames' representing usage." |
| paul@0 | 29 | |
| paul@0 | 30 | return ", ".join(attrnames) or "{}" |
| paul@0 | 31 | |
| paul@0 | 32 | def encode_constrained(constrained): |
| paul@0 | 33 | |
| paul@0 | 34 | "Encode the 'constrained' status for program summaries." |
| paul@0 | 35 | |
| paul@0 | 36 | return constrained and "constrained" or "deduced" |
| paul@0 | 37 | |
| paul@0 | 38 | def encode_usage(usage): |
| paul@0 | 39 | |
| paul@0 | 40 | "Encode attribute details from 'usage'." |
| paul@0 | 41 | |
| paul@0 | 42 | all_attrnames = [] |
| paul@0 | 43 | for t in usage: |
| paul@0 | 44 | all_attrnames.append(t) |
| paul@0 | 45 | return ", ".join(all_attrnames) or "{}" |
| paul@0 | 46 | |
| paul@0 | 47 | def encode_access_location(t): |
| paul@0 | 48 | |
| paul@0 | 49 | "Encode the access location 't'." |
| paul@0 | 50 | |
| paul@0 | 51 | path, name, attrname, version = t |
| paul@0 | 52 | return "%s %s %s:%d" % (path, name or "{}", attrname, version) |
| paul@0 | 53 | |
| paul@0 | 54 | def encode_location(t): |
| paul@0 | 55 | |
| paul@0 | 56 | "Encode the general location 't' in a concise form." |
| paul@0 | 57 | |
| paul@0 | 58 | path, name, attrname, version = t |
| paul@0 | 59 | if name is not None and version is not None: |
| paul@0 | 60 | return "%s %s:%d" % (path, name, version) |
| paul@0 | 61 | elif name is not None: |
| paul@0 | 62 | return "%s %s" % (path, name) |
| paul@0 | 63 | else: |
| paul@0 | 64 | return "%s :%s" % (path, attrname) |
| paul@0 | 65 | |
| paul@0 | 66 | def encode_modifiers(modifiers): |
| paul@0 | 67 | |
| paul@0 | 68 | "Encode assignment details from 'modifiers'." |
| paul@0 | 69 | |
| paul@0 | 70 | all_modifiers = [] |
| paul@0 | 71 | for t in modifiers: |
| paul@0 | 72 | all_modifiers.append(encode_modifier_term(t)) |
| paul@0 | 73 | return "".join(all_modifiers) |
| paul@0 | 74 | |
| paul@0 | 75 | def encode_modifier_term(t): |
| paul@0 | 76 | |
| paul@78 | 77 | "Encode modifier 't' representing assignment or invocation status." |
| paul@0 | 78 | |
| paul@78 | 79 | return t |
| paul@0 | 80 | |
| paul@0 | 81 | def decode_modifier_term(s): |
| paul@0 | 82 | |
| paul@78 | 83 | "Decode modifier term 's' representing assignment or invocation status." |
| paul@0 | 84 | |
| paul@78 | 85 | return s |
| paul@0 | 86 | |
| paul@56 | 87 | |
| paul@56 | 88 | |
| paul@56 | 89 | # Test generation functions. |
| paul@56 | 90 | |
| paul@56 | 91 | def get_kinds(all_types): |
| paul@56 | 92 | |
| paul@56 | 93 | """ |
| paul@56 | 94 | Return object kind details for 'all_types', being a collection of |
| paul@56 | 95 | references for program types. |
| paul@56 | 96 | """ |
| paul@56 | 97 | |
| paul@56 | 98 | return map(lambda ref: ref.get_kind(), all_types) |
| paul@56 | 99 | |
| paul@56 | 100 | def test_for_kind(prefix, kind): |
| paul@56 | 101 | |
| paul@56 | 102 | "Return a test condition identifier featuring 'prefix' and 'kind'." |
| paul@56 | 103 | |
| paul@56 | 104 | return "%s-%s" % (prefix, kind == "<instance>" and "instance" or "type") |
| paul@56 | 105 | |
| paul@56 | 106 | def test_for_kinds(prefix, all_kinds): |
| paul@56 | 107 | |
| paul@56 | 108 | """ |
| paul@67 | 109 | Return an identifier describing test conditions incorporating the given |
| paul@56 | 110 | 'prefix' and involving 'all_kinds', being a collection of object kinds. |
| paul@56 | 111 | """ |
| paul@56 | 112 | |
| paul@56 | 113 | return test_for_kind(prefix, first(all_kinds)) |
| paul@56 | 114 | |
| paul@67 | 115 | def test_for_type(prefix, ref): |
| paul@56 | 116 | |
| paul@56 | 117 | """ |
| paul@67 | 118 | Return an identifier describing a test condition incorporating the given |
| paul@67 | 119 | 'prefix' and involving 'ref', being a program type reference. The kind of |
| paul@67 | 120 | the reference is employed in the identifier. |
| paul@56 | 121 | """ |
| paul@56 | 122 | |
| paul@67 | 123 | return test_for_kind(prefix, ref.get_kind()) |
| paul@56 | 124 | |
| paul@56 | 125 | |
| paul@56 | 126 | |
| paul@0 | 127 | # Output program encoding. |
| paul@0 | 128 | |
| paul@0 | 129 | def encode_function_pointer(path): |
| paul@0 | 130 | |
| paul@0 | 131 | "Encode 'path' as a reference to an output program function." |
| paul@0 | 132 | |
| paul@0 | 133 | return "__fn_%s" % encode_path(path) |
| paul@0 | 134 | |
| paul@0 | 135 | def encode_instantiator_pointer(path): |
| paul@0 | 136 | |
| paul@0 | 137 | "Encode 'path' as a reference to an output program instantiator." |
| paul@0 | 138 | |
| paul@0 | 139 | return "__new_%s" % encode_path(path) |
| paul@0 | 140 | |
| paul@0 | 141 | def encode_path(path): |
| paul@0 | 142 | |
| paul@0 | 143 | "Encode 'path' as an output program object, translating special symbols." |
| paul@0 | 144 | |
| paul@0 | 145 | if path in reserved_words: |
| paul@0 | 146 | return "__%s" % path |
| paul@0 | 147 | else: |
| paul@0 | 148 | return path.replace("#", "__").replace("$", "__").replace(".", "_") |
| paul@0 | 149 | |
| paul@0 | 150 | def encode_symbol(symbol_type, path=None): |
| paul@0 | 151 | |
| paul@0 | 152 | "Encode a symbol with the given 'symbol_type' and optional 'path'." |
| paul@0 | 153 | |
| paul@0 | 154 | return "__%s%s" % (symbol_type, path and "_%s" % encode_path(path) or "") |
| paul@0 | 155 | |
| paul@56 | 156 | |
| paul@56 | 157 | |
| paul@0 | 158 | # Output language reserved words. |
| paul@0 | 159 | |
| paul@0 | 160 | reserved_words = [ |
| paul@0 | 161 | "break", "char", "const", "continue", |
| paul@0 | 162 | "default", "double", "else", |
| paul@0 | 163 | "float", "for", |
| paul@0 | 164 | "if", "int", "long", |
| paul@0 | 165 | "NULL", |
| paul@0 | 166 | "return", "struct", |
| paul@0 | 167 | "typedef", |
| paul@0 | 168 | "void", "while", |
| paul@0 | 169 | ] |
| paul@0 | 170 | |
| paul@0 | 171 | # vim: tabstop=4 expandtab shiftwidth=4 |
