846 lines
20 KiB
Rust
846 lines
20 KiB
Rust
use common::*;
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use itertools;
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use TokenKind::*;
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use CompilationErrorKind::*;
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use recipe_resolver::resolve_recipes;
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use assignment_resolver::resolve_assignments;
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pub struct Parser<'a> {
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text: &'a str,
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tokens: itertools::PutBack<vec::IntoIter<Token<'a>>>,
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recipes: Map<&'a str, Recipe<'a>>,
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assignments: Map<&'a str, Expression<'a>>,
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assignment_tokens: Map<&'a str, Token<'a>>,
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exports: Set<&'a str>,
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}
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impl<'a> Parser<'a> {
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pub fn new(text: &'a str, tokens: Vec<Token<'a>>) -> Parser<'a> {
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Parser {
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text: text,
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tokens: itertools::put_back(tokens),
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recipes: empty(),
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assignments: empty(),
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assignment_tokens: empty(),
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exports: empty(),
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}
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}
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fn peek(&mut self, kind: TokenKind) -> bool {
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let next = self.tokens.next().unwrap();
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let result = next.kind == kind;
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self.tokens.put_back(next);
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result
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}
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fn accept(&mut self, kind: TokenKind) -> Option<Token<'a>> {
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if self.peek(kind) {
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self.tokens.next()
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} else {
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None
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}
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}
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fn accept_any(&mut self, kinds: &[TokenKind]) -> Option<Token<'a>> {
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for kind in kinds {
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if self.peek(*kind) {
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return self.tokens.next();
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}
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}
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None
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}
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fn accepted(&mut self, kind: TokenKind) -> bool {
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self.accept(kind).is_some()
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}
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fn expect(&mut self, kind: TokenKind) -> Option<Token<'a>> {
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if self.peek(kind) {
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self.tokens.next();
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None
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} else {
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self.tokens.next()
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}
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}
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fn expect_eol(&mut self) -> Option<Token<'a>> {
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self.accepted(Comment);
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if self.peek(Eol) {
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self.accept(Eol);
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None
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} else if self.peek(Eof) {
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None
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} else {
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self.tokens.next()
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}
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}
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fn unexpected_token(&self, found: &Token<'a>, expected: &[TokenKind]) -> CompilationError<'a> {
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found.error(UnexpectedToken {
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expected: expected.to_vec(),
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found: found.kind,
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})
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}
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fn recipe(
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&mut self,
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name: &Token<'a>,
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doc: Option<Token<'a>>,
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quiet: bool,
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) -> CompilationResult<'a, ()> {
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if let Some(recipe) = self.recipes.get(name.lexeme) {
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return Err(name.error(DuplicateRecipe {
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recipe: recipe.name,
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first: recipe.line_number
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}));
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}
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let mut parsed_parameter_with_default = false;
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let mut parsed_variadic_parameter = false;
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let mut parameters: Vec<Parameter> = vec![];
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loop {
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let plus = self.accept(Plus);
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let parameter = match self.accept(Name) {
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Some(parameter) => parameter,
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None => if let Some(plus) = plus {
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return Err(self.unexpected_token(&plus, &[Name]));
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} else {
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break
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},
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};
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let variadic = plus.is_some();
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if parsed_variadic_parameter {
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return Err(parameter.error(ParameterFollowsVariadicParameter {
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parameter: parameter.lexeme,
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}));
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}
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if parameters.iter().any(|p| p.name == parameter.lexeme) {
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return Err(parameter.error(DuplicateParameter {
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recipe: name.lexeme, parameter: parameter.lexeme
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}));
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}
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let default;
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if self.accepted(Equals) {
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if let Some(string) = self.accept_any(&[StringToken, RawString]) {
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default = Some(CookedString::new(&string)?.cooked);
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} else {
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let unexpected = self.tokens.next().unwrap();
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return Err(self.unexpected_token(&unexpected, &[StringToken, RawString]));
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}
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} else {
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default = None
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}
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if parsed_parameter_with_default && default.is_none() {
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return Err(parameter.error(RequiredParameterFollowsDefaultParameter{
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parameter: parameter.lexeme,
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}));
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}
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parsed_parameter_with_default |= default.is_some();
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parsed_variadic_parameter = variadic;
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parameters.push(Parameter {
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default: default,
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name: parameter.lexeme,
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token: parameter,
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variadic: variadic,
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});
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}
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if let Some(token) = self.expect(Colon) {
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// if we haven't accepted any parameters, an equals
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// would have been fine as part of an assignment
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if parameters.is_empty() {
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return Err(self.unexpected_token(&token, &[Name, Plus, Colon, Equals]));
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} else {
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return Err(self.unexpected_token(&token, &[Name, Plus, Colon]));
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}
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}
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let mut dependencies = vec![];
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let mut dependency_tokens = vec![];
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while let Some(dependency) = self.accept(Name) {
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if dependencies.contains(&dependency.lexeme) {
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return Err(dependency.error(DuplicateDependency {
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recipe: name.lexeme,
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dependency: dependency.lexeme
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}));
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}
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dependencies.push(dependency.lexeme);
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dependency_tokens.push(dependency);
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}
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if let Some(token) = self.expect_eol() {
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return Err(self.unexpected_token(&token, &[Name, Eol, Eof]));
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}
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let mut lines: Vec<Vec<Fragment>> = vec![];
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let mut shebang = false;
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if self.accepted(Indent) {
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while !self.accepted(Dedent) {
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if self.accepted(Eol) {
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lines.push(vec![]);
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continue;
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}
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if let Some(token) = self.expect(Line) {
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return Err(token.error(Internal{
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message: format!("Expected a line but got {}", token.kind)
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}))
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}
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let mut fragments = vec![];
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while !(self.accepted(Eol) || self.peek(Dedent)) {
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if let Some(token) = self.accept(Text) {
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if fragments.is_empty() {
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if lines.is_empty() {
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if token.lexeme.starts_with("#!") {
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shebang = true;
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}
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} else if !shebang
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&& !lines.last().and_then(|line| line.last())
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.map(Fragment::continuation).unwrap_or(false)
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&& (token.lexeme.starts_with(' ') || token.lexeme.starts_with('\t')) {
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return Err(token.error(ExtraLeadingWhitespace));
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}
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}
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fragments.push(Fragment::Text{text: token});
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} else if let Some(token) = self.expect(InterpolationStart) {
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return Err(self.unexpected_token(&token, &[Text, InterpolationStart, Eol]));
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} else {
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fragments.push(Fragment::Expression{
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expression: self.expression(true)?
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});
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if let Some(token) = self.expect(InterpolationEnd) {
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return Err(self.unexpected_token(&token, &[InterpolationEnd]));
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}
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}
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}
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lines.push(fragments);
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}
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}
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self.recipes.insert(name.lexeme, Recipe {
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line_number: name.line,
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name: name.lexeme,
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doc: doc.map(|t| t.lexeme[1..].trim()),
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dependencies: dependencies,
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dependency_tokens: dependency_tokens,
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parameters: parameters,
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private: &name.lexeme[0..1] == "_",
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lines: lines,
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shebang: shebang,
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quiet: quiet,
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});
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Ok(())
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}
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fn expression(&mut self, interpolation: bool) -> CompilationResult<'a, Expression<'a>> {
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let first = self.tokens.next().unwrap();
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let lhs = match first.kind {
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Name => Expression::Variable {name: first.lexeme, token: first},
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Backtick => Expression::Backtick {
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raw: &first.lexeme[1..first.lexeme.len()-1],
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token: first
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},
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RawString | StringToken => {
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Expression::String{cooked_string: CookedString::new(&first)?}
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}
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_ => return Err(self.unexpected_token(&first, &[Name, StringToken])),
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};
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if self.accepted(Plus) {
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let rhs = self.expression(interpolation)?;
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Ok(Expression::Concatination{lhs: Box::new(lhs), rhs: Box::new(rhs)})
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} else if interpolation && self.peek(InterpolationEnd) {
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Ok(lhs)
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} else if let Some(token) = self.expect_eol() {
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if interpolation {
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return Err(self.unexpected_token(&token, &[Plus, Eol, InterpolationEnd]))
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} else {
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Err(self.unexpected_token(&token, &[Plus, Eol]))
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}
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} else {
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Ok(lhs)
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}
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}
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fn assignment(&mut self, name: Token<'a>, export: bool) -> CompilationResult<'a, ()> {
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if self.assignments.contains_key(name.lexeme) {
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return Err(name.error(DuplicateVariable {variable: name.lexeme}));
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}
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if export {
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self.exports.insert(name.lexeme);
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}
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let expression = self.expression(false)?;
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self.assignments.insert(name.lexeme, expression);
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self.assignment_tokens.insert(name.lexeme, name);
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Ok(())
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}
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pub fn justfile(mut self) -> CompilationResult<'a, Justfile<'a>> {
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let mut doc = None;
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loop {
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match self.tokens.next() {
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Some(token) => match token.kind {
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Eof => break,
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Eol => {
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doc = None;
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continue;
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}
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Comment => {
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if let Some(token) = self.expect_eol() {
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return Err(token.error(Internal {
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message: format!("found comment followed by {}", token.kind),
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}));
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}
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doc = Some(token);
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}
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At => if let Some(name) = self.accept(Name) {
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self.recipe(&name, doc, true)?;
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doc = None;
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} else {
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let unexpected = &self.tokens.next().unwrap();
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return Err(self.unexpected_token(unexpected, &[Name]));
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},
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Name => if token.lexeme == "export" {
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let next = self.tokens.next().unwrap();
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if next.kind == Name && self.accepted(Equals) {
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self.assignment(next, true)?;
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doc = None;
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} else {
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self.tokens.put_back(next);
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self.recipe(&token, doc, false)?;
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doc = None;
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}
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} else if self.accepted(Equals) {
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self.assignment(token, false)?;
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doc = None;
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} else {
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self.recipe(&token, doc, false)?;
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doc = None;
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},
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_ => return Err(self.unexpected_token(&token, &[Name, At])),
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},
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None => return Err(CompilationError {
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text: self.text,
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index: 0,
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line: 0,
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column: 0,
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width: None,
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kind: Internal {
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message: "unexpected end of token stream".to_string()
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}
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}),
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}
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}
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if let Some(token) = self.tokens.next() {
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return Err(token.error(Internal {
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message: format!("unexpected token remaining after parsing completed: {:?}", token.kind)
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}))
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}
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resolve_recipes(&self.recipes, &self.assignments, self.text)?;
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for recipe in self.recipes.values() {
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for parameter in &recipe.parameters {
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if self.assignments.contains_key(parameter.token.lexeme) {
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return Err(parameter.token.error(ParameterShadowsVariable {
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parameter: parameter.token.lexeme
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}));
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}
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}
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for dependency in &recipe.dependency_tokens {
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if !self.recipes[dependency.lexeme].parameters.is_empty() {
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return Err(dependency.error(DependencyHasParameters {
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recipe: recipe.name,
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dependency: dependency.lexeme,
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}));
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}
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}
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}
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resolve_assignments(&self.assignments, &self.assignment_tokens)?;
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Ok(Justfile {
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recipes: self.recipes,
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assignments: self.assignments,
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exports: self.exports,
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})
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}
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}
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#[cfg(test)]
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mod test {
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use super::*;
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use brev;
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use testing::parse_success;
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use testing::parse_error;
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macro_rules! summary_test {
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($name:ident, $input:expr, $expected:expr $(,)*) => {
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#[test]
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fn $name() {
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let input = $input;
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let expected = $expected;
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let justfile = parse_success(input);
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let actual = format!("{:#}", justfile);
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if actual != expected {
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println!("got:\n\"{}\"\n", actual);
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println!("\texpected:\n\"{}\"", expected);
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assert_eq!(actual, expected);
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}
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}
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}
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}
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summary_test!{parse_empty,
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"
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# hello
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",
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"",
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}
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summary_test!{parse_string_default,
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r#"
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foo a="b\t":
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"#,
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r#"foo a='b\t':"#,
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}
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summary_test!{parse_variadic,
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r#"
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foo +a:
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"#,
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r#"foo +a:"#,
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}
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summary_test!{parse_variadic_string_default,
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r#"
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foo +a="Hello":
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"#,
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r#"foo +a='Hello':"#,
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}
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summary_test!{parse_raw_string_default,
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r#"
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foo a='b\t':
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"#,
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r#"foo a='b\\t':"#,
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}
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summary_test!{parse_export,
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r#"
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export a = "hello"
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"#,
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r#"export a = "hello""#,
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}
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summary_test!{parse_complex,
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"
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x:
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y:
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z:
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foo = \"xx\"
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bar = foo
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goodbye = \"y\"
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hello a b c : x y z #hello
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#! blah
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#blarg
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{{ foo + bar}}abc{{ goodbye\t + \"x\" }}xyz
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1
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2
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3
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",
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"bar = foo
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foo = \"xx\"
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goodbye = \"y\"
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hello a b c: x y z
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#! blah
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#blarg
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{{foo + bar}}abc{{goodbye + \"x\"}}xyz
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1
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2
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3
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x:
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y:
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z:"
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}
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summary_test!{parse_shebang,
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"
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practicum = 'hello'
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install:
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\t#!/bin/sh
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\tif [[ -f {{practicum}} ]]; then
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\t\treturn
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\tfi
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",
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"practicum = \"hello\"
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install:
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#!/bin/sh
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if [[ -f {{practicum}} ]]; then
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\treturn
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fi",
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}
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summary_test!{parse_assignments,
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r#"a = "0"
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c = a + b + a + b
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b = "1"
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"#,
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r#"a = "0"
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b = "1"
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c = a + b + a + b"#,
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}
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summary_test!{parse_assignment_backticks,
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"a = `echo hello`
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c = a + b + a + b
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b = `echo goodbye`",
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"a = `echo hello`
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b = `echo goodbye`
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c = a + b + a + b",
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}
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summary_test!{parse_interpolation_backticks,
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r#"a:
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echo {{ `echo hello` + "blarg" }} {{ `echo bob` }}"#,
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r#"a:
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echo {{`echo hello` + "blarg"}} {{`echo bob`}}"#,
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}
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summary_test!{eof_test,
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"x:\ny:\nz:\na b c: x y z",
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"a b c: x y z\n\nx:\n\ny:\n\nz:",
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}
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summary_test!{string_quote_escape,
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r#"a = "hello\"""#,
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r#"a = "hello\"""#,
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}
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summary_test!{string_escapes,
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r#"a = "\n\t\r\"\\""#,
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r#"a = "\n\t\r\"\\""#,
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}
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summary_test!{parameters,
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"a b c:
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{{b}} {{c}}",
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"a b c:
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{{b}} {{c}}",
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}
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#[test]
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fn missing_colon() {
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let text = "a b c\nd e f";
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parse_error(text, CompilationError {
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text: text,
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index: 5,
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line: 0,
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column: 5,
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|
width: Some(1),
|
|
kind: UnexpectedToken{expected: vec![Name, Plus, Colon], found: Eol},
|
|
});
|
|
}
|
|
|
|
#[test]
|
|
fn missing_default_eol() {
|
|
let text = "hello arg=\n";
|
|
let expected = vec![StringToken, RawString];
|
|
let found = Eol;
|
|
parse_error(text, CompilationError {
|
|
text: text,
|
|
index: 10,
|
|
line: 0,
|
|
column: 10,
|
|
width: Some(1),
|
|
kind: UnexpectedToken{expected, found},
|
|
});
|
|
}
|
|
|
|
#[test]
|
|
fn missing_default_eof() {
|
|
let text = "hello arg=";
|
|
let expected = vec![StringToken, RawString];
|
|
let found = Eof;
|
|
parse_error(text, CompilationError {
|
|
text: text,
|
|
index: 10,
|
|
line: 0,
|
|
column: 10,
|
|
width: Some(0),
|
|
kind: UnexpectedToken{expected, found},
|
|
});
|
|
}
|
|
|
|
#[test]
|
|
fn missing_default_colon() {
|
|
let text = "hello arg=:";
|
|
let expected = vec![StringToken, RawString];
|
|
let found = Colon;
|
|
parse_error(text, CompilationError {
|
|
text: text,
|
|
index: 10,
|
|
line: 0,
|
|
column: 10,
|
|
width: Some(1),
|
|
kind: UnexpectedToken{expected, found},
|
|
});
|
|
}
|
|
|
|
#[test]
|
|
fn missing_default_backtick() {
|
|
let text = "hello arg=`hello`";
|
|
let expected = vec![StringToken, RawString];
|
|
let found = Backtick;
|
|
parse_error(text, CompilationError {
|
|
text: text,
|
|
index: 10,
|
|
line: 0,
|
|
column: 10,
|
|
width: Some(7),
|
|
kind: UnexpectedToken{expected, found},
|
|
});
|
|
}
|
|
|
|
#[test]
|
|
fn parameter_after_variadic() {
|
|
let text = "foo +a bbb:";
|
|
parse_error(text, CompilationError {
|
|
text: text,
|
|
index: 7,
|
|
line: 0,
|
|
column: 7,
|
|
width: Some(3),
|
|
kind: ParameterFollowsVariadicParameter{parameter: "bbb"}
|
|
});
|
|
}
|
|
|
|
#[test]
|
|
fn required_after_default() {
|
|
let text = "hello arg='foo' bar:";
|
|
parse_error(text, CompilationError {
|
|
text: text,
|
|
index: 16,
|
|
line: 0,
|
|
column: 16,
|
|
width: Some(3),
|
|
kind: RequiredParameterFollowsDefaultParameter{parameter: "bar"},
|
|
});
|
|
}
|
|
|
|
#[test]
|
|
fn missing_eol() {
|
|
let text = "a b c: z =";
|
|
parse_error(text, CompilationError {
|
|
text: text,
|
|
index: 9,
|
|
line: 0,
|
|
column: 9,
|
|
width: Some(1),
|
|
kind: UnexpectedToken{expected: vec![Name, Eol, Eof], found: Equals},
|
|
});
|
|
}
|
|
|
|
#[test]
|
|
fn duplicate_parameter() {
|
|
let text = "a b b:";
|
|
parse_error(text, CompilationError {
|
|
text: text,
|
|
index: 4,
|
|
line: 0,
|
|
column: 4,
|
|
width: Some(1),
|
|
kind: DuplicateParameter{recipe: "a", parameter: "b"}
|
|
});
|
|
}
|
|
|
|
#[test]
|
|
fn parameter_shadows_varible() {
|
|
let text = "foo = \"h\"\na foo:";
|
|
parse_error(text, CompilationError {
|
|
text: text,
|
|
index: 12,
|
|
line: 1,
|
|
column: 2,
|
|
width: Some(3),
|
|
kind: ParameterShadowsVariable{parameter: "foo"}
|
|
});
|
|
}
|
|
|
|
#[test]
|
|
fn dependency_has_parameters() {
|
|
let text = "foo arg:\nb: foo";
|
|
parse_error(text, CompilationError {
|
|
text: text,
|
|
index: 12,
|
|
line: 1,
|
|
column: 3,
|
|
width: Some(3),
|
|
kind: DependencyHasParameters{recipe: "b", dependency: "foo"}
|
|
});
|
|
}
|
|
|
|
#[test]
|
|
fn duplicate_dependency() {
|
|
let text = "a b c: b c z z";
|
|
parse_error(text, CompilationError {
|
|
text: text,
|
|
index: 13,
|
|
line: 0,
|
|
column: 13,
|
|
width: Some(1),
|
|
kind: DuplicateDependency{recipe: "a", dependency: "z"}
|
|
});
|
|
}
|
|
|
|
#[test]
|
|
fn duplicate_recipe() {
|
|
let text = "a:\nb:\na:";
|
|
parse_error(text, CompilationError {
|
|
text: text,
|
|
index: 6,
|
|
line: 2,
|
|
column: 0,
|
|
width: Some(1),
|
|
kind: DuplicateRecipe{recipe: "a", first: 0}
|
|
});
|
|
}
|
|
|
|
#[test]
|
|
fn duplicate_variable() {
|
|
let text = "a = \"0\"\na = \"0\"";
|
|
parse_error(text, CompilationError {
|
|
text: text,
|
|
index: 8,
|
|
line: 1,
|
|
column: 0,
|
|
width: Some(1),
|
|
kind: DuplicateVariable{variable: "a"}
|
|
});
|
|
}
|
|
|
|
#[test]
|
|
fn extra_whitespace() {
|
|
let text = "a:\n blah\n blarg";
|
|
parse_error(text, CompilationError {
|
|
text: text,
|
|
index: 10,
|
|
line: 2,
|
|
column: 1,
|
|
width: Some(6),
|
|
kind: ExtraLeadingWhitespace
|
|
});
|
|
// extra whitespace is okay in a shebang recipe
|
|
parse_success("a:\n #!\n print(1)");
|
|
}
|
|
|
|
#[test]
|
|
fn interpolation_outside_of_recipe() {
|
|
let text = "{{";
|
|
let expected = vec![Name, At];
|
|
let found = InterpolationStart;
|
|
parse_error(text, CompilationError {
|
|
text: text,
|
|
index: 0,
|
|
line: 0,
|
|
column: 0,
|
|
width: Some(2),
|
|
kind: UnexpectedToken{expected, found},
|
|
});
|
|
}
|
|
|
|
#[test]
|
|
fn unclosed_interpolation_delimiter() {
|
|
let text = "a:\n echo {{ foo";
|
|
let expected = vec![Plus, Eol, InterpolationEnd];
|
|
let found = Dedent;
|
|
parse_error(text, CompilationError {
|
|
text: text,
|
|
index: 15,
|
|
line: 1,
|
|
column: 12,
|
|
width: Some(0),
|
|
kind: UnexpectedToken{expected, found},
|
|
});
|
|
}
|
|
|
|
#[test]
|
|
fn plus_following_parameter() {
|
|
let text = "a b c+:";
|
|
parse_error(text, CompilationError {
|
|
text: text,
|
|
index: 5,
|
|
line: 0,
|
|
column: 5,
|
|
width: Some(1),
|
|
kind: UnexpectedToken{expected: vec![Name], found: Plus},
|
|
});
|
|
}
|
|
|
|
#[test]
|
|
fn readme_test() {
|
|
let mut justfiles = vec![];
|
|
let mut current = None;
|
|
|
|
for line in brev::slurp("README.asc").lines() {
|
|
if let Some(mut justfile) = current {
|
|
if line == "```" {
|
|
justfiles.push(justfile);
|
|
current = None;
|
|
} else {
|
|
justfile += line;
|
|
justfile += "\n";
|
|
current = Some(justfile);
|
|
}
|
|
} else if line == "```make" {
|
|
current = Some(String::new());
|
|
}
|
|
}
|
|
|
|
for justfile in justfiles {
|
|
parse_success(&justfile);
|
|
}
|
|
}
|
|
}
|