Implemented brainfuck interpreter
tdark
parent
2c0d5d12cb
commit
a500a7f8bc
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@ -6,29 +6,19 @@ version = 3
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name = "able-script"
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version = "0.1.0"
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dependencies = [
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"brainfuck",
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"clap",
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"logos",
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"rand",
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"rustyline",
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]
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[[package]]
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name = "aho-corasick"
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version = "0.5.3"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "ca972c2ea5f742bfce5687b9aef75506a764f61d37f8f649047846a9686ddb66"
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dependencies = [
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"memchr 0.1.11",
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]
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[[package]]
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name = "ansi_term"
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version = "0.11.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "ee49baf6cb617b853aa8d93bf420db2383fab46d314482ca2803b40d5fde979b"
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dependencies = [
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"winapi 0.3.9",
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"winapi",
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]
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[[package]]
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@ -39,7 +29,7 @@ checksum = "d9b39be18770d11421cdb1b9947a45dd3f37e93092cbf377614828a319d5fee8"
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dependencies = [
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"hermit-abi",
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"libc",
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"winapi 0.3.9",
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"winapi",
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]
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[[package]]
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@ -54,16 +44,6 @@ version = "1.2.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "cf1de2fe8c75bc145a2f577add951f8134889b4795d47466a54a5c846d691693"
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[[package]]
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name = "brainfuck"
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version = "0.2.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "86f8c57b0ea922157799312b2fa42b4ea14bb5d77ddf6699e846f6c8b787b3f8"
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dependencies = [
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"docopt",
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"rustc-serialize",
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]
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[[package]]
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name = "cc"
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version = "1.0.67"
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@ -85,7 +65,7 @@ dependencies = [
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"ansi_term",
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"atty",
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"bitflags",
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"strsim 0.8.0",
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"strsim",
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"textwrap",
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"unicode-width",
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"vec_map",
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@ -109,19 +89,7 @@ checksum = "4ebda144c4fe02d1f7ea1a7d9641b6fc6b580adcfa024ae48797ecdeb6825b4d"
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dependencies = [
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"libc",
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"redox_users",
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"winapi 0.3.9",
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]
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[[package]]
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name = "docopt"
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version = "0.6.86"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "4a7ef30445607f6fc8720f0a0a2c7442284b629cf0d049286860fae23e71c4d9"
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dependencies = [
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"lazy_static",
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"regex",
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"rustc-serialize",
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"strsim 0.5.2",
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"winapi",
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]
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[[package]]
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@ -143,7 +111,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "9564fc758e15025b46aa6643b1b77d047d1a56a1aea6e01002ac0c7026876213"
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dependencies = [
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"libc",
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"winapi 0.3.9",
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"winapi",
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]
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[[package]]
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@ -166,22 +134,6 @@ dependencies = [
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"libc",
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]
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[[package]]
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name = "kernel32-sys"
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version = "0.2.2"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "7507624b29483431c0ba2d82aece8ca6cdba9382bff4ddd0f7490560c056098d"
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dependencies = [
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"winapi 0.2.8",
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"winapi-build",
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]
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[[package]]
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name = "lazy_static"
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version = "0.2.11"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "76f033c7ad61445c5b347c7382dd1237847eb1bce590fe50365dcb33d546be73"
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[[package]]
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name = "libc"
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version = "0.2.93"
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@ -216,18 +168,9 @@ dependencies = [
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"fnv",
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"proc-macro2",
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"quote",
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"regex-syntax 0.6.23",
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"regex-syntax",
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"syn",
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"utf8-ranges 1.0.4",
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]
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[[package]]
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name = "memchr"
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version = "0.1.11"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "d8b629fb514376c675b98c1421e80b151d3817ac42d7c667717d282761418d20"
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dependencies = [
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"libc",
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"utf8-ranges",
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]
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[[package]]
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@ -350,37 +293,12 @@ dependencies = [
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"redox_syscall",
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]
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[[package]]
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name = "regex"
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version = "0.1.80"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "4fd4ace6a8cf7860714a2c2280d6c1f7e6a413486c13298bbc86fd3da019402f"
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dependencies = [
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"aho-corasick",
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"memchr 0.1.11",
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"regex-syntax 0.3.9",
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"thread_local",
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"utf8-ranges 0.1.3",
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]
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[[package]]
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name = "regex-syntax"
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version = "0.3.9"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "f9ec002c35e86791825ed294b50008eea9ddfc8def4420124fbc6b08db834957"
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[[package]]
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name = "regex-syntax"
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version = "0.6.23"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "24d5f089152e60f62d28b835fbff2cd2e8dc0baf1ac13343bef92ab7eed84548"
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[[package]]
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name = "rustc-serialize"
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version = "0.3.24"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "dcf128d1287d2ea9d80910b5f1120d0b8eede3fbf1abe91c40d39ea7d51e6fda"
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[[package]]
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name = "rustyline"
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version = "8.0.0"
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@ -393,7 +311,7 @@ dependencies = [
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"fs2",
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"libc",
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"log",
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"memchr 2.3.4",
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"memchr",
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"nix",
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"radix_trie",
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"scopeguard",
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@ -401,7 +319,7 @@ dependencies = [
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"unicode-segmentation",
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"unicode-width",
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"utf8parse",
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"winapi 0.3.9",
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"winapi",
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]
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[[package]]
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@ -416,12 +334,6 @@ version = "1.6.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "fe0f37c9e8f3c5a4a66ad655a93c74daac4ad00c441533bf5c6e7990bb42604e"
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[[package]]
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name = "strsim"
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version = "0.5.2"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "67f84c44fbb2f91db7fef94554e6b2ac05909c9c0b0bc23bb98d3a1aebfe7f7c"
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[[package]]
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name = "strsim"
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version = "0.8.0"
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@ -448,25 +360,6 @@ dependencies = [
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"unicode-width",
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]
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[[package]]
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name = "thread-id"
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version = "2.0.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "a9539db560102d1cef46b8b78ce737ff0bb64e7e18d35b2a5688f7d097d0ff03"
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dependencies = [
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"kernel32-sys",
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"libc",
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]
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[[package]]
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name = "thread_local"
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version = "0.2.7"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "8576dbbfcaef9641452d5cf0df9b0e7eeab7694956dd33bb61515fb8f18cfdd5"
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dependencies = [
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"thread-id",
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]
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[[package]]
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name = "unicode-segmentation"
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version = "1.7.1"
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@ -485,12 +378,6 @@ version = "0.2.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "f7fe0bb3479651439c9112f72b6c505038574c9fbb575ed1bf3b797fa39dd564"
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[[package]]
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name = "utf8-ranges"
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version = "0.1.3"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "a1ca13c08c41c9c3e04224ed9ff80461d97e121589ff27c753a16cb10830ae0f"
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[[package]]
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name = "utf8-ranges"
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version = "1.0.4"
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@ -515,12 +402,6 @@ version = "0.10.2+wasi-snapshot-preview1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "fd6fbd9a79829dd1ad0cc20627bf1ed606756a7f77edff7b66b7064f9cb327c6"
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[[package]]
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name = "winapi"
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version = "0.2.8"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
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[[package]]
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name = "winapi"
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version = "0.3.9"
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@ -531,12 +412,6 @@ dependencies = [
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"winapi-x86_64-pc-windows-gnu",
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]
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[[package]]
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name = "winapi-build"
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version = "0.1.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"
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[[package]]
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name = "winapi-i686-pc-windows-gnu"
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version = "0.4.0"
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@ -7,8 +7,7 @@ edition = "2018"
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# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
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[dependencies]
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clap="*"
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clap = "*"
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logos = "0.12"
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rand = "*"
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rustyline = "8.0.0"
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brainfuck = "0.2.1"
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374
src/brian.rs
374
src/brian.rs
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@ -1,13 +1,367 @@
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//! A brainfuck interpreter capable of executing arbitrary code, with arbitrary inputs and outputs.
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//!
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//! If you just want to execute some simple brainfuck, check the [`interpret_with_io`] function.
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//!
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//! To construct the interpreter, use the [`from_ascii`] or [`from_ascii_with_input_buffer`] methods. The latter grants access to
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//! the method [`add_input`], which allows for the addition of input while the interpreter is running.
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//!
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//! [`from_ascii`]: Interpreter::from_ascii
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//! [`from_ascii_with_input_buffer`]: Interpreter::from_ascii_with_input_buffer
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//! [`add_input`]: Interpreter::add_input
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//!
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//! Finally, to run the interpreter, you can use the [`advance`], [`advance_until_io`], or [`interpret_with_output`] methods.
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//!
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//! [`advance`]: Interpreter::advance
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//! [`advance_until_io`]: Interpreter::advance_until_io
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//! [`interpret_with_output`]: Interpreter::interpret_with_output
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#![deny(missing_docs)]
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use std::{
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collections::VecDeque,
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io::{Read, Write},
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};
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// NOTE(Able): This is the brain fuck interface
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use brainfuck::program::Program;
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use brainfuck::tape::ArrayTape;
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use brainfuck::Interpreter;
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pub fn bff_eval(function: String, args: String) {
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let mut stdout = "";
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let program = Program::parse("++>+.").unwrap();
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/* This failes currently I guess
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let mut interp = Interpreter::<ArrayTape>::new(program, &mut stdin, &mut stdout);
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*/
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#[derive(Debug, Clone, PartialEq, Eq)]
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/// A brainfuck interpreter. Read the [module level documentation](self) for more
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pub struct Interpreter<'a, I> {
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code: &'a [u8],
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instr_ptr: usize,
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tape: Vec<i8>,
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data_ptr: usize,
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input: I,
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}
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impl<'a> Interpreter<'a, InputBuffer> {
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/// Construct an `Interpreter` from an ASCII string of code with an empty input buffer
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pub fn from_ascii_with_input_buffer(code: &'a [u8]) -> Self {
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Self {
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code,
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instr_ptr: 0,
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tape: Vec::new(),
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data_ptr: 0,
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input: InputBuffer(VecDeque::new()),
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}
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}
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/// Add a byte to the input buffer of this interpreter
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pub fn add_input(&mut self, input: i8) {
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self.input.0.push_back(input);
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}
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}
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impl<'a, I: BootlegRead> Interpreter<'a, I> {
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/// Construct an interpreter from an ASCII string of code and an source of input bytes
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pub fn from_ascii(code: &'a [u8], input: I) -> Self {
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Self {
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code,
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instr_ptr: 0,
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tape: Vec::new(),
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data_ptr: 0,
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input,
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}
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}
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/// Advance the interpreter by one instruction.
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/// A return value of Ok(None) indicates succesful termination of the interpreter
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pub fn advance(&mut self) -> Result<Option<Status>, ProgramError> {
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let &opcode = match self.code.get(self.instr_ptr) {
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Some(opcode) => opcode,
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None => return Ok(None),
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};
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match opcode {
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b'>' => self.data_ptr += 1,
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b'<' => {
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self.data_ptr = self
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.data_ptr
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.checked_sub(1)
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.ok_or(ProgramError::DataPointerUnderflow)?;
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}
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b'+' => {
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let val = self.get_or_resize_tape_mut();
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*val = val.checked_add(1).ok_or(ProgramError::IntegerOverflow)?;
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}
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b'-' => {
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let val = self.get_or_resize_tape_mut();
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*val = val.checked_sub(1).ok_or(ProgramError::IntegerUnderflow)?;
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}
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b'.' => {
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self.instr_ptr += 1;
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return Ok(Some(Status::Output(self.get_at_data_ptr())));
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}
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b',' => match self.input.bootleg_read() {
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Ok(Some(num)) => *self.get_or_resize_tape_mut() = num,
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Ok(None) => return Ok(Some(Status::NeedsInput)),
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Err(_) => return Err(ProgramError::InputReadError),
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},
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b'[' => {
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if self.get_at_data_ptr() == 0 {
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self.instr_ptr = self
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.get_matching_closing_bracket(self.instr_ptr)
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.ok_or(ProgramError::UnmatchedOpeningBracket)?
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//Instruction pointer will be incremented by 1 after the match
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}
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}
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b']' => {
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if self.get_at_data_ptr() != 0 {
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self.instr_ptr = self
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.get_matching_opening_bracket(self.instr_ptr)
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.ok_or(ProgramError::UnmatchedClosingBracket)?
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//Instruction pointer will be incremented by 1 after the match
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}
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}
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_ => {} //brainfuck treats all characters it doesn't understand as comments
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}
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self.instr_ptr += 1;
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Ok(Some(Status::Continue))
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}
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/// Advances the interpreter until the next IO operation. See [`advance`](Interpreter::advance)
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pub fn advance_until_io(&mut self) -> Result<Option<IoStatus>, ProgramError> {
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while let Some(status) = self.advance()? {
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match status {
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Status::NeedsInput => return Ok(Some(IoStatus::NeedsInput)),
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Status::Output(out) => return Ok(Some(IoStatus::Output(out))),
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Status::Continue => continue,
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}
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}
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Ok(None)
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}
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/// Executes the interpreter until it halts, writing all return values to the provided `Write` type.
|
||||
/// For more granular control, use [`advance`](Interpreter::advance)
|
||||
pub fn interpret_with_output<O: Write>(&mut self, mut output: O) -> Result<(), InterpretError> {
|
||||
while let Some(status) = self.advance_until_io()? {
|
||||
match status {
|
||||
IoStatus::NeedsInput => return Err(InterpretError::EndOfInput),
|
||||
IoStatus::Output(out) => match output.write(&[out as u8]) {
|
||||
Ok(0) => return Err(InterpretError::OutputBufferFull),
|
||||
Ok(_) => continue,
|
||||
Err(_) => return Err(InterpretError::OutputWriteError),
|
||||
},
|
||||
}
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn get_or_resize_tape_mut(&mut self) -> &mut i8 {
|
||||
if self.data_ptr >= self.tape.len() {
|
||||
self.tape.resize(self.data_ptr + 1, 0);
|
||||
}
|
||||
&mut self.tape[self.data_ptr]
|
||||
}
|
||||
|
||||
fn get_at_data_ptr(&self) -> i8 {
|
||||
//No need to resize the tape to read: if the tape doesn't extend that far already, it holds a value of 0
|
||||
self.tape.get(self.data_ptr).copied().unwrap_or(0)
|
||||
}
|
||||
|
||||
fn get_matching_closing_bracket(&mut self, opening: usize) -> Option<usize> {
|
||||
self.code[opening..]
|
||||
.iter()
|
||||
.zip(opening..)
|
||||
.scan(0, |counter, (char, index)| {
|
||||
match char {
|
||||
b'[' => *counter += 1,
|
||||
b']' => *counter -= 1,
|
||||
_ => {}
|
||||
};
|
||||
Some((*counter, index))
|
||||
})
|
||||
.find_map(
|
||||
|(counter, index)| {
|
||||
if counter == 0 {
|
||||
Some(index)
|
||||
} else {
|
||||
None
|
||||
}
|
||||
},
|
||||
)
|
||||
}
|
||||
|
||||
fn get_matching_opening_bracket(&mut self, closing: usize) -> Option<usize> {
|
||||
self.code[..closing + 1]
|
||||
.iter()
|
||||
.zip(0..closing + 1)
|
||||
.rev()
|
||||
.scan(0, |counter, (char, index)| {
|
||||
match char {
|
||||
b']' => *counter += 1,
|
||||
b'[' => *counter -= 1,
|
||||
_ => {}
|
||||
};
|
||||
Some((*counter, index))
|
||||
})
|
||||
.find_map(
|
||||
|(counter, index)| {
|
||||
if counter == 0 {
|
||||
Some(index)
|
||||
} else {
|
||||
None
|
||||
}
|
||||
},
|
||||
)
|
||||
}
|
||||
}
|
||||
|
||||
/// A convenience function for interpreting brainfuck code with a given input and output source.
|
||||
/// For more information, consult [the module level documentation](self)
|
||||
pub fn interpret_with_io<I: BootlegRead, O: Write>(
|
||||
code: &[u8],
|
||||
input: I,
|
||||
output: O,
|
||||
) -> Result<(), InterpretError> {
|
||||
Interpreter::from_ascii(code, input).interpret_with_output(output)
|
||||
}
|
||||
|
||||
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
|
||||
///The result of advancing the interpreter by one step, assuming it didn't terminate
|
||||
pub enum Status {
|
||||
NeedsInput,
|
||||
Output(i8),
|
||||
Continue,
|
||||
}
|
||||
|
||||
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
|
||||
/// The result of advancing the interpreter until the next IO operation, assuming it didn't terminate
|
||||
pub enum IoStatus {
|
||||
NeedsInput,
|
||||
Output(i8),
|
||||
}
|
||||
|
||||
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
|
||||
/// An error that occurred while the interpreter was advancing
|
||||
pub enum ProgramError {
|
||||
DataPointerUnderflow,
|
||||
IntegerOverflow,
|
||||
IntegerUnderflow,
|
||||
InputReadError,
|
||||
UnmatchedOpeningBracket,
|
||||
UnmatchedClosingBracket,
|
||||
}
|
||||
|
||||
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
|
||||
/// An error that occurred while the interpreter was being run start-to-end all in one go
|
||||
pub enum InterpretError {
|
||||
ProgramError(ProgramError),
|
||||
EndOfInput,
|
||||
OutputBufferFull,
|
||||
OutputWriteError,
|
||||
}
|
||||
|
||||
impl From<ProgramError> for InterpretError {
|
||||
fn from(e: ProgramError) -> Self {
|
||||
InterpretError::ProgramError(e)
|
||||
}
|
||||
}
|
||||
|
||||
/// A bootlegged version of the standard library's read trait, so as to allow the interpreter to be generic over any `Read`
|
||||
/// type, as well as over an input buffer.
|
||||
pub trait BootlegRead {
|
||||
type Error;
|
||||
fn bootleg_read(&mut self) -> Result<Option<i8>, Self::Error>;
|
||||
}
|
||||
|
||||
impl<T: Read> BootlegRead for T {
|
||||
type Error = std::io::Error;
|
||||
fn bootleg_read(&mut self) -> Result<Option<i8>, Self::Error> {
|
||||
let mut buffer = [0];
|
||||
match self.read(&mut buffer) {
|
||||
Ok(0) => Ok(None),
|
||||
Ok(_) => Ok(Some(buffer[0] as i8)),
|
||||
Err(e) => Err(e),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// A wrapper around a `VecDeque`, to be able to implement `BootlegRead` for it
|
||||
struct InputBuffer(VecDeque<i8>);
|
||||
|
||||
impl BootlegRead for InputBuffer {
|
||||
type Error = std::convert::Infallible;
|
||||
fn bootleg_read(&mut self) -> Result<Option<i8>, Self::Error> {
|
||||
Ok(self.0.pop_front())
|
||||
}
|
||||
}
|
||||
|
||||
#[cfg(test)]
|
||||
mod tests {
|
||||
use super::*;
|
||||
|
||||
#[test]
|
||||
fn adder() {
|
||||
let mut interpreter = Interpreter {
|
||||
code: b"[->+<]", //Source: https://en.wikipedia.org/wiki/Brainfuck
|
||||
instr_ptr: 0,
|
||||
tape: vec![10, 5],
|
||||
data_ptr: 0,
|
||||
input: std::io::empty(),
|
||||
};
|
||||
|
||||
while let Some(status) = interpreter.advance_until_io().expect("Unexpected error") {
|
||||
match status {
|
||||
IoStatus::NeedsInput => panic!("Requested input in an IO-less program"),
|
||||
IoStatus::Output(_) => panic!("Produced output in an IO-less program"),
|
||||
}
|
||||
}
|
||||
|
||||
assert_eq!(interpreter.tape, vec![0, 15]);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn hello_world() {
|
||||
let mut interpreter = Interpreter {
|
||||
//Source: https://en.wikipedia.org/wiki/Brainfuck
|
||||
code: b"++++++++[>++++[>++>+++>+++>+<<<<-]>+>+>->>+[<]<-]>>.>---.+++++++..+++.>>.<-.<.+++.------.--------.>>+.>++.",
|
||||
instr_ptr: 0,
|
||||
tape: vec![],
|
||||
data_ptr: 0,
|
||||
input: std::io::empty(),
|
||||
};
|
||||
|
||||
let mut string = Vec::new();
|
||||
interpreter
|
||||
.interpret_with_output(&mut string)
|
||||
.expect("Failed to write to output buffer");
|
||||
assert_eq!(string, b"Hello World!\n");
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn with_input_buffer() {
|
||||
let mut interpreter = Interpreter::from_ascii_with_input_buffer(b"+++++.>,[-<->].");
|
||||
let output = match interpreter
|
||||
.advance_until_io()
|
||||
.expect("Unexpected error")
|
||||
.expect("Unexpected termination")
|
||||
{
|
||||
IoStatus::NeedsInput => panic!("Unexpected input request"),
|
||||
IoStatus::Output(out) => out,
|
||||
};
|
||||
|
||||
assert_eq!(
|
||||
interpreter.advance_until_io(),
|
||||
Ok(Some(IoStatus::NeedsInput))
|
||||
);
|
||||
|
||||
interpreter.add_input(output);
|
||||
|
||||
assert_eq!(
|
||||
interpreter.advance_until_io(),
|
||||
Ok(Some(IoStatus::Output(0)))
|
||||
);
|
||||
assert_eq!(interpreter.advance_until_io(), Ok(None));
|
||||
}
|
||||
}
|
||||
|
|
|
|||
|
|
@ -14,7 +14,6 @@ use parser::Parser;
|
|||
|
||||
fn main() {
|
||||
// variables::test(); // NOTE(Able): Add this as a test case
|
||||
brian::bff_eval("hi".to_string(), "hello".to_string());
|
||||
let matches = App::new("AbleScript")
|
||||
.version(env!("CARGO_PKG_VERSION"))
|
||||
.author("Able <abl3theabove@gmail.com>")
|
||||
|
|
|
|||
Loading…
Reference in New Issue