basic parser
This commit is contained in:
parent
7988c8a2e1
commit
695cbb24f1
3 changed files with 392 additions and 113 deletions
68
src/ast.rs
68
src/ast.rs
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@ -1,30 +1,32 @@
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use std::boxed::Box;
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//<<<<>>>><<>><><<>><<<*>>><<>><><<>><<<<>>>>\\
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#[derive(Debug)]
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#[derive(Debug, PartialEq)]
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pub enum Command {
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Simple {
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assignments: Vec<(String, Word)>,
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assignments: Vec<Assignment>,
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command_word: Word,
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redirections: Vec<Redirection>
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},
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Pipeline(Vec<Command>),
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Sequence(Vec<Command>),
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ShortCircuitConjection(Vec<Command>),
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ShortCircuitConjunction(Vec<Command>),
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ShortCircuitDisjunction(Vec<Command>),
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Negation(Command),
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Negation(Box<Command>),
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While {
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condition: Command,
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loop_body: Command
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condition: Box<Command>,
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loop_body: Box<Command>
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},
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For {
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varname: String,
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sequence: Word,
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loop_body: Command
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}
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loop_body: Box<Command>
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},
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If {
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condition: Command,
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then_branch: Command,
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else_branch: Command
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condition: Box<Command>,
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then_branch: Box<Command>,
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else_branch: Box<Command>
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},
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Case {
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expr: Word,
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@ -32,35 +34,25 @@ pub enum Command {
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},
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Function {
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name: String,
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body: Command
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body: Box<Command>
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}
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}
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/*
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* We are all luminous beings.
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* Why then, do we not appear before each
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* other radiant in our illumination ?
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*/
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/*
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* Bewteen the idea
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* And the reality
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* Between the motion
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* And the act
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* Falls the Shadow
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* (T.S. Eliot)
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*/
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//<<<<>>>><<>><><<>><<<*>>><<>><><<>><<<<>>>>\\
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#[derive(Debug)]
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#[derive(Debug, PartialEq)]
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pub struct Assignment {
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pub name: String,
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pub value: Word
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}
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#[derive(Debug, PartialEq)]
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pub struct Word {
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pub segments: Vec<WordSegment>
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}
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#[derive(Debug)]
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#[derive(Debug, PartialEq)]
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pub enum WordSegment {
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FieldSeparator,
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Tilde(String),
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Literal(String),
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Parameter(String, ParameterFormat),
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@ -68,7 +60,7 @@ pub enum WordSegment {
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DoubleQuote(Word),
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}
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#[derive(Debug)]
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#[derive(Debug, PartialEq)]
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pub enum ParameterFormat {
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Normal,
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Length,
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@ -79,42 +71,42 @@ pub enum ParameterFormat {
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Sub(ParamSubSide, ParamSubMode, Word),
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}
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#[derive(Debug)]
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#[derive(Debug, PartialEq)]
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pub enum ParamSubMode {
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Shortest, Longest
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}
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#[derive(Debug)]
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#[derive(Debug, PartialEq)]
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pub enum ParamSubSide {
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Prefix, Suffix
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}
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//<<<<>>>><<>><><<>><<<*>>><<>><><<>><<<<>>>>\\
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#[derive(Debug)]
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#[derive(Debug, PartialEq)]
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pub struct Redirection {
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redirection_type: RedirectionType,
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fd: u64,
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target: Word
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}
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#[derive(Debug)]
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#[derive(Debug, PartialEq)]
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pub enum RedirectionType {
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File(FileRedirectionType),
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Dup(DupRedirectionType),
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Heredoc // '<<'
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}
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#[derive(Debug)]
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#[derive(Debug, PartialEq)]
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pub enum FileRedirectionType {
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In, // '<'
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InOut, // '<>'
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Out, // '>'
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OutReplace, // '>|'
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OutAppend, // '>|'
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OutAppend, // '>>'
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}
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#[derive(Debug)]
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#[derive(Debug, PartialEq)]
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pub enum DupRedirectionType {
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In, // '<&'
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Out // '>&'
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@ -1,3 +1,5 @@
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#![feature(iterator_try_collect)]
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use {
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laddertypes::*,
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std::io::BufRead,
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@ -38,10 +40,14 @@ fn main() {
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let stdin = std::io::stdin();
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for line in std::io::BufReader::new(stdin).lines() {
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if let Ok(line) = line {
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let cmd = parse::parse_cmd( &mut line.chars().peekable() );
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eprintln!("parsed cmd: {:?}", cmd);
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/*
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let mut lex = parse::WordLexer::from( line.chars() );
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for word in lex {
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eprintln!("word-segment: {:?}", word);
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}
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}
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*/
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}
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}
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429
src/parse.rs
429
src/parse.rs
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@ -1,105 +1,368 @@
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use {
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crate::ast::*,
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std::iter::{Peekable, FromIterator},
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std::iter::{Peekable},
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};
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pub struct WordLexer<It>
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where It: Iterator<Item = char> {
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chars: Peekable<It>
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#[derive(Debug, PartialEq)]
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pub enum LexError {
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UnexpectedEnd(Vec<Option<char>>),
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UnexpectedToken(char),
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InvalidFileRedirectionType
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}
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impl<It> From<It> for WordLexer<It>
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///! iterates chars until it finds some char in `delim`
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pub struct DelimIter<'a, It>
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where It: Iterator<Item = char> {
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fn from(iter: It) -> Self {
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WordLexer {
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chars: iter.into_iter().peekable()
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}
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chars: &'a mut Peekable<It>,
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delim: Vec<(Option<char>, bool)>
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}
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impl<'a, It> DelimIter<'a, It>
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where It: Iterator<Item = char> {
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fn new(chars: &'a mut Peekable<It>, delim: Vec<(Option<char>, bool)>) -> Self {
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DelimIter { chars, delim }
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}
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fn new_whitespace(chars: &'a mut Peekable<It>) -> Self {
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DelimIter::new(chars, vec![
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(None, true),
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(Some(' '), true),
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(Some('\t'), true),
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(Some('\n'), true)
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])
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}
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fn new_shell_word(chars: &'a mut Peekable<It>) -> Self {
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DelimIter::new(chars, vec![
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(None, true),
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(Some(' '), true),
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(Some('\t'), true),
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(Some('\n'), true),
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(Some('|'), false),
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(Some('&'), false),
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(Some(';'), false),
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(Some('\"'), false),
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(Some('\''), false)
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])
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}
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}
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#[derive(Debug)]
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pub enum LexError {
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UnexpectedEnd(char)
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}
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impl<'a, It> Iterator for DelimIter<'a, It>
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where It: 'a + Iterator<Item = char> {
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type Item = Result<char, LexError>;
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impl<It> WordLexer<It>
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where It: Iterator<Item = char> {
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fn collect_until(&mut self, close: char) -> Result<String, LexError> {
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let mut val = String::new();
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while let Some(c) = self.chars.peek().cloned() {
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if c == close {
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return Ok(val)
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} else {
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self.chars.next();
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val.push(c);
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fn next(&mut self) -> Option<Result<char, LexError>> {
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for (delim, consume) in self.delim.iter() {
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if self.chars.peek().cloned() == *delim {
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if *consume {
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self.chars.next();
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}
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return None;
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}
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}
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if close.is_whitespace() {
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Ok(val)
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} else {
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Err(LexError::UnexpectedEnd(close))
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match self.chars.next() {
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Some(c) => Some(Ok(c)),
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None => Some(Err(LexError::UnexpectedEnd(vec![])))
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}
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}
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}
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impl<It> Iterator for WordLexer<It>
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pub struct WordLexer<'a, It>
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where It: 'a + Iterator<Item = char> {
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chars: &'a mut Peekable<It>
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}
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impl<'a, It> WordLexer<'a, It>
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where It: Iterator<Item = char> {
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fn collect_until(&mut self, close: Option<char>) -> Result<String, LexError> {
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DelimIter::new(&mut self.chars, vec![(close, true)])
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.try_collect::<String>()
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}
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}
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pub fn skip_whitespace<It>(chars: &mut Peekable<It>)
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where It: Iterator<Item = char>
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{
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while let Some(c) = chars.peek() {
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if c.is_whitespace() {
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chars.next();
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} else {
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break;
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}
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}
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}
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pub fn parse_quoted<It>(chars: &mut Peekable<It>) -> Result<WordSegment, LexError>
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where It: Iterator<Item = char>
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{
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assert_eq!( chars.next(), Some('\''));
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let quoted = DelimIter::new(chars, vec![(Some('\''), true)]).try_collect::<String>();
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match quoted {
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Ok(s) => {
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Ok(WordSegment::Literal(s))
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},
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Err(e) => Err(e)
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}
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}
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pub fn parse_doublequoted<It>(chars: &mut Peekable<It>) -> Result<WordSegment, LexError>
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where It: Iterator<Item = char>
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{
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assert_eq!( chars.next(), Some('\"'));
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let quoted = DelimIter::new(chars, vec![(Some('\"'), true)]).try_collect::<String>();
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match quoted {
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Ok(s) => {
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let word = Word {
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segments: // fixme: handle spaces correctly -> create QuoteLexer
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WordLexer { chars: &mut s.chars().peekable() }
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.scan((), |_, x| x.ok())
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.collect::<Vec<_>>()
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};
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Ok(WordSegment::DoubleQuote(word))
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},
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Err(e) => Err(e)
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}
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}
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pub fn parse_word<It>(chars: &mut Peekable<It>) -> Result<Word, LexError>
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where It: Iterator<Item = char>
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{
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Ok(Word {
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segments: WordLexer{ chars }.try_collect::<Vec<_>>()?
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})
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}
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pub fn parse_assignment<It>(chars: &mut Peekable<It>) -> Result<Assignment, LexError>
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where It: Iterator<Item = char>
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{
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let name = DelimIter::new(chars, vec![(Some('='), true)]).try_collect::<String>()?;
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let value_str = DelimIter::new_whitespace(chars).try_collect::<String>()?;
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let value = parse_word(&mut value_str.chars().peekable())?;
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Ok(Assignment{ name, value })
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}
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impl std::str::FromStr for FileRedirectionType {
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type Err = LexError;
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fn from_str(s: &str) -> Result<FileRedirectionType, LexError> {
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match s {
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"<" => Ok(FileRedirectionType::In),
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"<>" => Ok(FileRedirectionType::InOut),
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">" => Ok(FileRedirectionType::Out),
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">|" => Ok(FileRedirectionType::OutReplace),
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">>" => Ok(FileRedirectionType::OutAppend),
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_ => Err(LexError::InvalidFileRedirectionType)
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}
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}
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}
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pub fn parse_redirection<It>(chars: &mut Peekable<It>) -> Result<Redirection, LexError>
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where It: Iterator<Item = char>
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{
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Err(LexError::InvalidFileRedirectionType)
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// let name = DelimIterator::new(chars, vec!['<', '>']).collect::<String>();
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}
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pub fn parse_simple_cmd<It>(chars: &mut Peekable<It>) -> Result<Option<Command>, LexError>
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where It: Iterator<Item = char>
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{
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let mut assignments = Vec::new();
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let mut redirections = Vec::new();
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if chars.peek() == None {
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return Ok(None);
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}
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let mut first = DelimIter::new_shell_word(chars).try_collect::<String>()?;
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while first.contains('=') {
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assignments.push( parse_assignment(chars)? );
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first = DelimIter::new_shell_word(chars).try_collect::<String>()?;
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}
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let mut cmd_segments = WordLexer{ chars }.try_collect::<Vec<_>>()?;
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cmd_segments.insert(0, WordSegment::Literal(first));
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Ok(Some(Command::Simple {
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assignments,
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command_word: Word { segments: cmd_segments },
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redirections,
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}))
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}
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pub fn parse_cmd<It>(chars: &mut Peekable<It>) -> Result<Option<Command>, LexError>
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where It: Iterator<Item = char>
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{
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skip_whitespace(chars);
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match chars.peek() {
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Some('!') => {
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chars.next();
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if let Some(cmd) = parse_cmd(chars)? {
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Ok(Some(Command::Negation(Box::new(cmd))))
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} else {
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Err(LexError::UnexpectedEnd(vec![]))
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}
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}
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_ => {
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if let Some(head) = parse_simple_cmd(chars)? {
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skip_whitespace(chars);
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match chars.peek() {
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Some(';') => {
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chars.next();
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let tail = parse_cmd( chars ) ?;
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match tail {
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Some(Command::Sequence(mut s)) => {
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s.insert(0, head);
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Ok(Some(Command::Sequence(s)))
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}
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Some(tail) => {
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Ok(Some(Command::Sequence(vec![ head, tail ])))
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}
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None => {
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Ok(Some(head))
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}
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}
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}
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Some('|') => {
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chars.next();
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match chars.peek() {
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Some('|') => {
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chars.next();
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let tail = parse_cmd( chars ) ?;
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match tail {
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Some(Command::ShortCircuitDisjunction(mut s)) => {
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s.insert(0, head);
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Ok(Some(Command::ShortCircuitDisjunction(s)))
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}
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Some(tail) => {
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Ok(Some(Command::ShortCircuitDisjunction(vec![ head, tail ])))
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}
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None => {
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Err(LexError::UnexpectedEnd(vec![Some('|')]))
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}
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}
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}
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_ => {
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let tail = parse_cmd( chars ) ?;
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match tail {
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Some(Command::Pipeline(mut s)) => {
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s.insert(0, head);
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Ok(Some(Command::Pipeline(s)))
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}
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Some(tail) => {
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Ok(Some(Command::Pipeline(vec![ head, tail ])))
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}
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None => {
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Err(LexError::UnexpectedEnd(vec![]))
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}
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}
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}
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}
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}
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Some('&') => {
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chars.next();
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match chars.peek() {
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Some('&') => {
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chars.next();
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let tail = parse_cmd( chars ) ?;
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match tail {
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Some(Command::ShortCircuitConjunction(mut s)) => {
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s.insert(0, head);
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Ok(Some(Command::ShortCircuitConjunction(s)))
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}
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Some(tail) => {
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Ok(Some(Command::ShortCircuitConjunction(vec![ head, tail ])))
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}
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None => {
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Err(LexError::UnexpectedEnd(vec![Some('&'), Some('&')]))
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}
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}
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}
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Some(c) => {
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Err(LexError::UnexpectedToken(*c))
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}
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None => {
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// todo:
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// background job
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Ok(Some(head))
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}
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}
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}
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Some(c) => {
|
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Err(LexError::UnexpectedToken(*c))
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}
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None => {
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Ok(Some(head))
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}
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}
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} else {
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Ok(None)
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}
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}
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}
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}
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impl<'a, It> Iterator for WordLexer<'a, It>
|
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where It: 'a + Iterator<Item = char> {
|
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type Item = Result<WordSegment, LexError>;
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|
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fn next(&mut self) -> Option<Result<WordSegment, LexError>> {
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skip_whitespace(self.chars);
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match self.chars.peek().cloned() {
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||||
Some('|') => { None }
|
||||
Some('&') => { None }
|
||||
Some(';') => { None }
|
||||
Some('~') => {
|
||||
self.chars.next();
|
||||
match self.collect_until(' ') {
|
||||
Ok(s) => Some(Ok(WordSegment::Tilde(s))),
|
||||
let user = DelimIter::new_whitespace(self.chars).collect();
|
||||
match user {
|
||||
Ok(user) => Some(Ok(WordSegment::Tilde(user))),
|
||||
Err(e) => Some(Err(e))
|
||||
}
|
||||
}
|
||||
Some('"') => {
|
||||
self.chars.next();
|
||||
match self.collect_until('"') {
|
||||
Ok(s) => {
|
||||
self.chars.next();
|
||||
|
||||
let word = Word {
|
||||
segments: WordLexer { chars: s.chars().peekable() }
|
||||
.scan((), |_, x| x.ok())
|
||||
.collect::<Vec<_>>()
|
||||
};
|
||||
|
||||
Some(Ok(WordSegment::DoubleQuote(word)))
|
||||
},
|
||||
Err(e) => Some(Err(e))
|
||||
}
|
||||
},
|
||||
Some('\'') => {
|
||||
self.chars.next();
|
||||
match self.collect_until('\'') {
|
||||
Ok(s) => {
|
||||
self.chars.next();
|
||||
Some(Ok(WordSegment::Literal(s)))
|
||||
},
|
||||
Err(e) => Some(Err(e))
|
||||
}
|
||||
},
|
||||
Some('"') => { Some(parse_doublequoted(self.chars)) },
|
||||
Some('\'') => { Some(parse_quoted(self.chars)) },
|
||||
Some('$') => {
|
||||
self.chars.next();
|
||||
match self.chars.peek() {
|
||||
Some('{') => {
|
||||
self.chars.next();
|
||||
match self.collect_until('}') {
|
||||
match DelimIter::new(&mut self.chars, vec![(Some('}'), true)]).try_collect::<String>() {
|
||||
Ok(s) => {
|
||||
self.chars.next();
|
||||
Some(Ok(WordSegment::Variable(s)))
|
||||
Some(Ok(WordSegment::Parameter(s, ParameterFormat::Normal)))
|
||||
}
|
||||
Err(e) => Some(Err(e))
|
||||
}
|
||||
}
|
||||
Some('(') => {
|
||||
self.chars.next();
|
||||
let subcmd_str = DelimIter::new(&mut self.chars, vec![(Some(')'), true)]).try_collect::<String>();
|
||||
match subcmd_str {
|
||||
Ok(subcmd_str) => {
|
||||
match parse_cmd(&mut subcmd_str.chars().peekable()) {
|
||||
Ok(Some(subcmd)) => {
|
||||
Some(Ok(WordSegment::Subshell(subcmd)))
|
||||
}
|
||||
Ok(None) => None,
|
||||
Err(err) => Some(Err(err))
|
||||
}
|
||||
}
|
||||
Err(err) => Some(Err(err))
|
||||
}
|
||||
}
|
||||
_ => {
|
||||
match self.collect_until(' ') {
|
||||
match DelimIter::new_whitespace(self.chars).collect() {
|
||||
Ok(s) => {
|
||||
Some(Ok(WordSegment::Variable(s)))
|
||||
Some(Ok(WordSegment::Parameter(s, ParameterFormat::Normal)))
|
||||
}
|
||||
Err(e) => Some(Err(e))
|
||||
}
|
||||
|
@ -107,19 +370,11 @@ where It: Iterator<Item = char> {
|
|||
}
|
||||
}
|
||||
Some(c) => {
|
||||
while let Some(c) = self.chars.peek() {
|
||||
if c.is_whitespace() {
|
||||
self.chars.next();
|
||||
} else {
|
||||
return match self.collect_until(' ') {
|
||||
Ok(s) => {
|
||||
Some(Ok(WordSegment::Literal(s)))
|
||||
}
|
||||
Err(e) => Some(Err(e))
|
||||
};
|
||||
}
|
||||
let s : Result<String, LexError> = DelimIter::new_shell_word(self.chars).collect();
|
||||
match s {
|
||||
Ok(s) => Some(Ok(WordSegment::Literal(s))),
|
||||
Err(e) => Some(Err(e))
|
||||
}
|
||||
None
|
||||
}
|
||||
None => {
|
||||
None
|
||||
|
@ -128,3 +383,29 @@ where It: Iterator<Item = char> {
|
|||
}
|
||||
}
|
||||
|
||||
|
||||
mod test {
|
||||
use crate::parse::*;
|
||||
|
||||
#[test]
|
||||
fn test_delim_iter() {
|
||||
let mut cs = "test 1234".chars().peekable();
|
||||
let mut lexer = DelimIter::new_shell_word(&mut cs);
|
||||
assert_eq!(lexer.try_collect::<String>(), Ok(String::from("test")));
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_word_lexer() {
|
||||
let mut cs = "test 1234|test".chars().peekable();
|
||||
|
||||
{
|
||||
let mut lexer = WordLexer{ chars: &mut cs };
|
||||
assert_eq!(lexer.next(), Some(Ok(WordSegment::Literal(String::from("test")))));
|
||||
assert_eq!(lexer.next(), Some(Ok(WordSegment::Literal(String::from("1234")))));
|
||||
assert_eq!(lexer.next(), None);
|
||||
}
|
||||
|
||||
assert_eq!(cs.next(), Some('|'));
|
||||
}
|
||||
}
|
||||
|
||||
|
|
Loading…
Reference in a new issue