Lexer
This commit is contained in:
commit
5b0263c89f
9 changed files with 545 additions and 0 deletions
1
.env
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1
.env
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LOG=info
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1
.gitignore
vendored
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1
.gitignore
vendored
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||||||
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/target
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242
Cargo.lock
generated
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242
Cargo.lock
generated
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||||||
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# This file is automatically @generated by Cargo.
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||||||
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# It is not intended for manual editing.
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||||||
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version = 3
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||||||
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||||||
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[[package]]
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||||||
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name = "ansi_term"
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||||||
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version = "0.12.1"
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||||||
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source = "registry+https://github.com/rust-lang/crates.io-index"
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||||||
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checksum = "d52a9bb7ec0cf484c551830a7ce27bd20d67eac647e1befb56b0be4ee39a55d2"
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||||||
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dependencies = [
|
||||||
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"winapi",
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||||||
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]
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||||||
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||||||
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[[package]]
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||||||
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name = "cfg-if"
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||||||
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version = "1.0.0"
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||||||
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source = "registry+https://github.com/rust-lang/crates.io-index"
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||||||
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checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
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||||||
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||||||
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[[package]]
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||||||
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name = "crftng-intrprtrs"
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||||||
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version = "0.1.0"
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||||||
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dependencies = [
|
||||||
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"dotenv",
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||||||
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"tracing",
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||||||
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"tracing-subscriber",
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||||||
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]
|
||||||
|
|
||||||
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[[package]]
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||||||
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name = "dotenv"
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||||||
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version = "0.15.0"
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||||||
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source = "registry+https://github.com/rust-lang/crates.io-index"
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||||||
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checksum = "77c90badedccf4105eca100756a0b1289e191f6fcbdadd3cee1d2f614f97da8f"
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||||||
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||||||
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[[package]]
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||||||
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name = "lazy_static"
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||||||
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version = "1.4.0"
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||||||
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source = "registry+https://github.com/rust-lang/crates.io-index"
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||||||
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checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
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||||||
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||||||
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[[package]]
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||||||
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name = "log"
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||||||
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version = "0.4.14"
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||||||
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "51b9bbe6c47d51fc3e1a9b945965946b4c44142ab8792c50835a980d362c2710"
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dependencies = [
|
||||||
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"cfg-if",
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]
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[[package]]
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||||||
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name = "matchers"
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version = "0.1.0"
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||||||
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "8263075bb86c5a1b1427b5ae862e8889656f126e9f77c484496e8b47cf5c5558"
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dependencies = [
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||||||
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"regex-automata",
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]
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[[package]]
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||||||
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name = "once_cell"
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version = "1.10.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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||||||
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checksum = "87f3e037eac156d1775da914196f0f37741a274155e34a0b7e427c35d2a2ecb9"
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[[package]]
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||||||
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name = "pin-project-lite"
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||||||
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version = "0.2.8"
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||||||
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "e280fbe77cc62c91527259e9442153f4688736748d24660126286329742b4c6c"
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[[package]]
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||||||
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name = "proc-macro2"
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version = "1.0.36"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "c7342d5883fbccae1cc37a2353b09c87c9b0f3afd73f5fb9bba687a1f733b029"
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dependencies = [
|
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"unicode-xid",
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]
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[[package]]
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name = "quote"
|
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version = "1.0.16"
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||||||
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "b4af2ec4714533fcdf07e886f17025ace8b997b9ce51204ee69b6da831c3da57"
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dependencies = [
|
||||||
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"proc-macro2",
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]
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[[package]]
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name = "regex"
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version = "1.5.5"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "1a11647b6b25ff05a515cb92c365cec08801e83423a235b51e231e1808747286"
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dependencies = [
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"regex-syntax",
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]
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[[package]]
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name = "regex-automata"
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version = "0.1.10"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "6c230d73fb8d8c1b9c0b3135c5142a8acee3a0558fb8db5cf1cb65f8d7862132"
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dependencies = [
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"regex-syntax",
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]
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[[package]]
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name = "regex-syntax"
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version = "0.6.25"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "f497285884f3fcff424ffc933e56d7cbca511def0c9831a7f9b5f6153e3cc89b"
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[[package]]
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name = "sharded-slab"
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version = "0.1.4"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "900fba806f70c630b0a382d0d825e17a0f19fcd059a2ade1ff237bcddf446b31"
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dependencies = [
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"lazy_static",
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]
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[[package]]
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||||||
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name = "smallvec"
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version = "1.8.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "f2dd574626839106c320a323308629dcb1acfc96e32a8cba364ddc61ac23ee83"
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[[package]]
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name = "syn"
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version = "1.0.89"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "ea297be220d52398dcc07ce15a209fce436d361735ac1db700cab3b6cdfb9f54"
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dependencies = [
|
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"proc-macro2",
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"quote",
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"unicode-xid",
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]
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[[package]]
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name = "thread_local"
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version = "1.1.4"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "5516c27b78311c50bf42c071425c560ac799b11c30b31f87e3081965fe5e0180"
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dependencies = [
|
||||||
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"once_cell",
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]
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[[package]]
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name = "tracing"
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||||||
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version = "0.1.32"
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||||||
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "4a1bdf54a7c28a2bbf701e1d2233f6c77f473486b94bee4f9678da5a148dca7f"
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dependencies = [
|
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"cfg-if",
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"pin-project-lite",
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"tracing-attributes",
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"tracing-core",
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]
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[[package]]
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name = "tracing-attributes"
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version = "0.1.20"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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||||||
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checksum = "2e65ce065b4b5c53e73bb28912318cb8c9e9ad3921f1d669eb0e68b4c8143a2b"
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dependencies = [
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|
"proc-macro2",
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"quote",
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"syn",
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]
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[[package]]
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||||||
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name = "tracing-core"
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||||||
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version = "0.1.23"
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||||||
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source = "registry+https://github.com/rust-lang/crates.io-index"
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||||||
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checksum = "aa31669fa42c09c34d94d8165dd2012e8ff3c66aca50f3bb226b68f216f2706c"
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||||||
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dependencies = [
|
||||||
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"lazy_static",
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||||||
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"valuable",
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]
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||||||
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||||||
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[[package]]
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||||||
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name = "tracing-log"
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||||||
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version = "0.1.2"
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||||||
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source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
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checksum = "a6923477a48e41c1951f1999ef8bb5a3023eb723ceadafe78ffb65dc366761e3"
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||||||
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dependencies = [
|
||||||
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"lazy_static",
|
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"log",
|
||||||
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"tracing-core",
|
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]
|
||||||
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||||||
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[[package]]
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||||||
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name = "tracing-subscriber"
|
||||||
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version = "0.3.9"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "9e0ab7bdc962035a87fba73f3acca9b8a8d0034c2e6f60b84aeaaddddc155dce"
|
||||||
|
dependencies = [
|
||||||
|
"ansi_term",
|
||||||
|
"lazy_static",
|
||||||
|
"matchers",
|
||||||
|
"regex",
|
||||||
|
"sharded-slab",
|
||||||
|
"smallvec",
|
||||||
|
"thread_local",
|
||||||
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"tracing",
|
||||||
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"tracing-core",
|
||||||
|
"tracing-log",
|
||||||
|
]
|
||||||
|
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||||||
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[[package]]
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||||||
|
name = "unicode-xid"
|
||||||
|
version = "0.2.2"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "8ccb82d61f80a663efe1f787a51b16b5a51e3314d6ac365b08639f52387b33f3"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "valuable"
|
||||||
|
version = "0.1.0"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "830b7e5d4d90034032940e4ace0d9a9a057e7a45cd94e6c007832e39edb82f6d"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "winapi"
|
||||||
|
version = "0.3.9"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
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checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
|
||||||
|
dependencies = [
|
||||||
|
"winapi-i686-pc-windows-gnu",
|
||||||
|
"winapi-x86_64-pc-windows-gnu",
|
||||||
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]
|
||||||
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|
||||||
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[[package]]
|
||||||
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name = "winapi-i686-pc-windows-gnu"
|
||||||
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version = "0.4.0"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
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checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
|
||||||
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|
||||||
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[[package]]
|
||||||
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name = "winapi-x86_64-pc-windows-gnu"
|
||||||
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version = "0.4.0"
|
||||||
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source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
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checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
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9
Cargo.toml
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9
Cargo.toml
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[package]
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name = "crftng-intrprtrs"
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version = "0.1.0"
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edition = "2021"
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[dependencies]
|
||||||
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dotenv = "0.15.0"
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||||||
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tracing = "0.1.32"
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tracing-subscriber = { version = "0.3.9", features = ["env-filter"] }
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1
rustfmt.toml
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1
rustfmt.toml
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hard_tabs=true
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20
src/lexer/error.rs
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20
src/lexer/error.rs
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use core::fmt;
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use std::error::Error;
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#[derive(Debug)]
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pub struct LexingError {
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pub line: usize,
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pub msg: String,
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}
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impl fmt::Display for LexingError {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "Error on line: {}", self.line)
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}
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|
}
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impl Error for LexingError {
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fn description(&self) -> &str {
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||||||
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&self.msg
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||||||
|
}
|
||||||
|
}
|
175
src/lexer/mod.rs
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175
src/lexer/mod.rs
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|
||||||
|
mod error;
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pub mod token;
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use std::iter;
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use std::str::Chars;
|
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|
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|
pub use error::LexingError;
|
||||||
|
|
||||||
|
use self::token::Token;
|
||||||
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|
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|
#[derive(Debug)]
|
||||||
|
pub struct Lexer<'a> {
|
||||||
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source: &'a str,
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source_iter: iter::Peekable<Chars<'a>>,
|
||||||
|
line: usize,
|
||||||
|
}
|
||||||
|
|
||||||
|
impl<'a> Lexer<'a> {
|
||||||
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pub fn new(code: &'a str) -> Lexer<'a> {
|
||||||
|
return Lexer {
|
||||||
|
source: code,
|
||||||
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source_iter: code.chars().peekable(),
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||||||
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line: 0,
|
||||||
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};
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn scan_tokens(&mut self) -> Result<Vec<token::Token>, Vec<LexingError>> {
|
||||||
|
let mut tokens = Vec::new();
|
||||||
|
let mut errors = Vec::new();
|
||||||
|
|
||||||
|
while self.source_iter.peek().is_some() {
|
||||||
|
match self.scan_token() {
|
||||||
|
Some(Ok(token)) => {
|
||||||
|
if errors.is_empty() {
|
||||||
|
tokens.push(token)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
Some(Err(e)) => errors.push(e),
|
||||||
|
None => (),
|
||||||
|
}
|
||||||
|
}
|
||||||
|
tokens.push(self.get_token(token::TokenType::Eof));
|
||||||
|
|
||||||
|
if errors.is_empty() {
|
||||||
|
Ok(tokens)
|
||||||
|
} else {
|
||||||
|
Err(errors)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
fn get_token(&self, token_type: token::TokenType) -> token::Token {
|
||||||
|
token::Token {
|
||||||
|
token_type,
|
||||||
|
line: self.line,
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
fn get_token_if_next_eq_or(
|
||||||
|
&mut self,
|
||||||
|
to_eq: char,
|
||||||
|
if_eq_type: token::TokenType,
|
||||||
|
else_type: token::TokenType,
|
||||||
|
) -> token::Token {
|
||||||
|
let token_type = self
|
||||||
|
.source_iter
|
||||||
|
.next_if_eq(&to_eq)
|
||||||
|
.map(|_| if_eq_type)
|
||||||
|
.unwrap_or(else_type);
|
||||||
|
self.get_token(token_type)
|
||||||
|
}
|
||||||
|
|
||||||
|
fn scan_token(&mut self) -> Option<Result<Token, LexingError>> {
|
||||||
|
Some(Ok(match self.source_iter.next()? {
|
||||||
|
'(' => self.get_token(token::TokenType::LeftParen),
|
||||||
|
')' => self.get_token(token::TokenType::RightParen),
|
||||||
|
'{' => self.get_token(token::TokenType::LeftBrace),
|
||||||
|
'}' => self.get_token(token::TokenType::RightBrace),
|
||||||
|
',' => self.get_token(token::TokenType::Comma),
|
||||||
|
'.' => self.get_token(token::TokenType::Dot),
|
||||||
|
'-' => self.get_token(token::TokenType::Minus),
|
||||||
|
'+' => self.get_token(token::TokenType::Plus),
|
||||||
|
';' => self.get_token(token::TokenType::Semicolon),
|
||||||
|
'*' => self.get_token(token::TokenType::Star),
|
||||||
|
'!' => self.get_token_if_next_eq_or(
|
||||||
|
'=',
|
||||||
|
token::TokenType::BangEqual,
|
||||||
|
token::TokenType::Bang,
|
||||||
|
),
|
||||||
|
'=' => self.get_token_if_next_eq_or(
|
||||||
|
'=',
|
||||||
|
token::TokenType::EqualEqual,
|
||||||
|
token::TokenType::Equal,
|
||||||
|
),
|
||||||
|
'<' => self.get_token_if_next_eq_or(
|
||||||
|
'=',
|
||||||
|
token::TokenType::LessEqual,
|
||||||
|
token::TokenType::Equal,
|
||||||
|
),
|
||||||
|
'>' => self.get_token_if_next_eq_or(
|
||||||
|
'=',
|
||||||
|
token::TokenType::GreaterEqual,
|
||||||
|
token::TokenType::Greater,
|
||||||
|
),
|
||||||
|
'"' => {
|
||||||
|
let mut string = String::with_capacity(128);
|
||||||
|
let unmatched_char_error = Some(Err(LexingError {
|
||||||
|
line: self.line,
|
||||||
|
msg: "Unmatched \" character".to_string(),
|
||||||
|
}));
|
||||||
|
|
||||||
|
loop {
|
||||||
|
match self.source_iter.next() {
|
||||||
|
Some('"') => break,
|
||||||
|
Some('\\') => match self.source_iter.next() {
|
||||||
|
Some(c) => string.push(c),
|
||||||
|
None => return unmatched_char_error,
|
||||||
|
},
|
||||||
|
Some(c) => string.push(c),
|
||||||
|
None => return unmatched_char_error,
|
||||||
|
}
|
||||||
|
}
|
||||||
|
self.get_token(token::TokenType::String(string))
|
||||||
|
}
|
||||||
|
c@'0'..='9' => {
|
||||||
|
let mut num: i64 = c.to_digit(10).unwrap() as i64;
|
||||||
|
while let Some(c) = self.source_iter.peek() {
|
||||||
|
match c {
|
||||||
|
c@'0'..='9' => {
|
||||||
|
num *= 10;
|
||||||
|
num += c.to_digit(10).unwrap() as i64;
|
||||||
|
},
|
||||||
|
_ => break,
|
||||||
|
}
|
||||||
|
}
|
||||||
|
self.get_token(token::TokenType::Int(num))
|
||||||
|
},
|
||||||
|
c@'a'..='z' | c@'A'..='Z' => {
|
||||||
|
let mut identifier = String::with_capacity(128);
|
||||||
|
identifier.push(c);
|
||||||
|
while let Some(c) = self.source_iter.next_if(|c| c.is_alphanumeric()) {
|
||||||
|
identifier.push(c);
|
||||||
|
}
|
||||||
|
|
||||||
|
self.get_token(match identifier.as_str() {
|
||||||
|
"and" => token::TokenType::And,
|
||||||
|
"else" => token::TokenType::Else,
|
||||||
|
"false" => token::TokenType::False,
|
||||||
|
"fun" => token::TokenType::Fun,
|
||||||
|
"for" => token::TokenType::For,
|
||||||
|
"if" => token::TokenType::If,
|
||||||
|
"nil" => token::TokenType::Nil,
|
||||||
|
"print" => token::TokenType::Print,
|
||||||
|
"return" => token::TokenType::Return,
|
||||||
|
"true" => token::TokenType::True,
|
||||||
|
"let" => token::TokenType::Let,
|
||||||
|
"While" => token::TokenType::While,
|
||||||
|
"or" => token::TokenType::Or,
|
||||||
|
_ => token::TokenType::Identifier(identifier)
|
||||||
|
|
||||||
|
})
|
||||||
|
},
|
||||||
|
// Ignore whitespace
|
||||||
|
' ' | '\r' | '\t' => return None,
|
||||||
|
'\n' => {
|
||||||
|
self.line += 1;
|
||||||
|
return None;
|
||||||
|
}
|
||||||
|
c => {
|
||||||
|
return Some(Err(LexingError {
|
||||||
|
line: self.line,
|
||||||
|
msg: format!("Unexpected character: {c}"),
|
||||||
|
}))
|
||||||
|
}
|
||||||
|
}))
|
||||||
|
}
|
||||||
|
}
|
49
src/lexer/token.rs
Normal file
49
src/lexer/token.rs
Normal file
|
@ -0,0 +1,49 @@
|
||||||
|
#[derive(Debug)]
|
||||||
|
pub struct Token {
|
||||||
|
pub token_type: TokenType,
|
||||||
|
pub line: usize,
|
||||||
|
}
|
||||||
|
|
||||||
|
#[derive(Debug)]
|
||||||
|
pub enum TokenType {
|
||||||
|
LeftParen,
|
||||||
|
RightParen,
|
||||||
|
LeftBrace,
|
||||||
|
RightBrace,
|
||||||
|
Comma,
|
||||||
|
Dot,
|
||||||
|
Minus,
|
||||||
|
Plus,
|
||||||
|
Semicolon,
|
||||||
|
Slash,
|
||||||
|
Star,
|
||||||
|
|
||||||
|
Bang,
|
||||||
|
BangEqual,
|
||||||
|
Equal,
|
||||||
|
EqualEqual,
|
||||||
|
Greater,
|
||||||
|
GreaterEqual,
|
||||||
|
Less,
|
||||||
|
LessEqual,
|
||||||
|
|
||||||
|
Identifier(String),
|
||||||
|
String(String),
|
||||||
|
Int(i64),
|
||||||
|
Float(f64),
|
||||||
|
|
||||||
|
And,
|
||||||
|
Else,
|
||||||
|
False,
|
||||||
|
Fun,
|
||||||
|
For,
|
||||||
|
If,
|
||||||
|
Nil,
|
||||||
|
Or,
|
||||||
|
Print,
|
||||||
|
Return,
|
||||||
|
True,
|
||||||
|
Let,
|
||||||
|
While,
|
||||||
|
Eof,
|
||||||
|
}
|
47
src/main.rs
Normal file
47
src/main.rs
Normal file
|
@ -0,0 +1,47 @@
|
||||||
|
mod lexer;
|
||||||
|
|
||||||
|
use lexer::Lexer;
|
||||||
|
use std::{fs, io, path};
|
||||||
|
use tracing::Level;
|
||||||
|
use tracing_subscriber::{EnvFilter, FmtSubscriber};
|
||||||
|
|
||||||
|
fn run_file(file: &path::Path) -> Result<(), io::Error> {
|
||||||
|
let src = fs::read_to_string(file)?;
|
||||||
|
run(&src).unwrap();
|
||||||
|
Ok(())
|
||||||
|
}
|
||||||
|
|
||||||
|
fn run_repl() {
|
||||||
|
let mut line_buf = String::with_capacity(1024);
|
||||||
|
loop {
|
||||||
|
match io::stdin().read_line(&mut line_buf) {
|
||||||
|
Ok(_) => {
|
||||||
|
let line = line_buf.trim();
|
||||||
|
run(line).unwrap();
|
||||||
|
line_buf.clear();
|
||||||
|
}
|
||||||
|
Err(_e) => unimplemented!(),
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
fn run(code: &str) -> Result<(), Vec<lexer::LexingError>> {
|
||||||
|
let mut lexer = Lexer::new(code);
|
||||||
|
println!("{:?}", lexer.scan_tokens()?);
|
||||||
|
Ok(())
|
||||||
|
}
|
||||||
|
|
||||||
|
fn main() {
|
||||||
|
dotenv::dotenv().ok();
|
||||||
|
let subscriber = FmtSubscriber::builder()
|
||||||
|
.with_max_level(Level::TRACE)
|
||||||
|
.with_env_filter(EnvFilter::from_env("LOG"))
|
||||||
|
.finish();
|
||||||
|
tracing::subscriber::set_global_default(subscriber).unwrap();
|
||||||
|
|
||||||
|
if let Some(file) = std::env::args_os().nth(1) {
|
||||||
|
run_file(file.as_ref()).unwrap();
|
||||||
|
} else {
|
||||||
|
run_repl()
|
||||||
|
}
|
||||||
|
}
|
Loading…
Reference in a new issue