Struct lrlex::CTLexerBuilder

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pub struct CTLexerBuilder<'a, LexerTypesT: LexerTypes = DefaultLexerTypes<u32>>where
    LexerTypesT::StorageT: Debug + Eq + Hash,
    usize: AsPrimitive<LexerTypesT::StorageT>,
{ /* private fields */ }

Expand description

A CTLexerBuilder allows one to specify the criteria for building a statically generated lexer.

Implementations§

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impl<'a> CTLexerBuilder<'a, DefaultLexerTypes<u32>>

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pub fn new() -> Self

Create a new CTLexerBuilder.

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impl<'a, LexerTypesT: LexerTypes> CTLexerBuilder<'a, LexerTypesT>
where LexerTypesT::StorageT: 'static + Debug + Eq + Hash + PrimInt + Serialize + TryFrom<usize> + Unsigned, usize: AsPrimitive<LexerTypesT::StorageT>,

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pub fn new_with_lexemet() -> Self

Create a new CTLexerBuilder.

LexerTypesT::StorageT must be an unsigned integer type (e.g. u8, u16) which is big enough to index all the tokens, rules, and productions in the lexer and less than or equal in size to usize (e.g. on a 64-bit machine u128 would be too big). If you are lexing large files, the additional storage requirements of larger integer types can be noticeable, and in such cases it can be worth specifying a smaller type. StorageT defaults to u32 if unspecified.

§Examples

CTLexerBuilder::<DefaultLexerTypes<u8>>::new_with_lexemet()
    .lexer_in_src_dir("grm.l", None)?
    .build()?;

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pub fn lrpar_config<F>(self, config_func: F) -> Self
where F: 'static + Fn(CTParserBuilder<'_, LexerTypesT>) -> CTParserBuilder<'_, LexerTypesT>,

An optional convenience function to make it easier to create an (lrlex) lexer and (lrpar) parser in one shot. The closure passed to this function will be called during CTLexerBuilder::build: it will be passed an lrpar CTParserBuilder instance upon which it can set whatever lrpar options are desired. CTLexerBuilder will then create both the compiler and lexer and link them together as required.

§Examples

CTLexerBuilder:::new()
    .lrpar_config(|ctp| {
        ctp.yacckind(YaccKind::Grmtools)
            .grammar_in_src_dir("calc.y")
            .unwrap()
    })
    .lexer_in_src_dir("calc.l")?
    .build()?;

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pub fn lexer_in_src_dir(self, srcp: P) -> Result<Self, Box<dyn Error>>
where P: AsRef<Path>,

Set the input lexer path to a file relative to this project’s src directory. This will also set the output path (i.e. you do not need to call CTLexerBuilder::output_path).

For example if a/b.l is passed as inp then CTLexerBuilder::build will:

use src/a/b.l as the input file.
write output to a file which can then be imported by calling lrlex_mod!("a/b.l").
create a module in that output file named b_l.

You can override the output path and/or module name by calling CTLexerBuilder::output_path and/or CTLexerBuilder::mod_name, respectively, after calling this function.

This is a convenience function that makes it easier to compile lexer files stored in a project’s src/ directory: please see CTLexerBuilder::build for additional constraints and information about the generated files. Note also that each .l file can only be processed once using this function: if you want to generate multiple lexers from a single .l file, you will need to use CTLexerBuilder::output_path.

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pub fn lexer_path(self, inp: P) -> Self
where P: AsRef<Path>,

Set the input lexer path to inp. If specified, you must also call CTLexerBuilder::output_path. In general it is easier to use CTLexerBuilder::lexer_in_src_dir.

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pub fn output_path(self, outp: P) -> Self
where P: AsRef<Path>,

Set the output lexer path to outp. Note that there are no requirements on outp: the file can exist anywhere you can create a valid Path to. However, if you wish to use crate::lrlex_mod! you will need to make sure that outp is in std::env::var("OUT_DIR") or one of its subdirectories.

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pub fn lexerkind(self, lexerkind: LexerKind) -> Self

Set the type of lexer to be generated to lexerkind.

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pub fn mod_name(self, mod_name: &'a str) -> Self

Set the generated module name to mod_name. If no module name is specified, process_file will attempt to create a sensible default based on the input filename.

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pub fn visibility(self, vis: Visibility) -> Self

Set the visibility of the generated module to vis. Defaults to Visibility::Private.

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pub fn rust_edition(self, edition: RustEdition) -> Self

Sets the rust edition to be used for generated code. Defaults to the latest edition of rust supported by grmtools.

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pub fn rule_ids_map<T: Borrow<HashMap<String, LexerTypesT::StorageT>> + Clone>( self, rule_ids_map: T, ) -> Self

Set this lexer builder’s map of rule IDs to rule_ids_map. By default, lexing rules have arbitrary, but distinct, IDs. Setting the map of rule IDs (from rule names to StorageT) allows users to synchronise a lexer and parser and to check that all rules are used by both parts).

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pub fn build(self) -> Result<CTLexer, Box<dyn Error>>

Statically compile the .l file specified by CTLexerBuilder::lexer_path() into Rust, placing the output into the file specified by CTLexerBuilder::output_path().

The generated module follows the form:

   mod modname {
     pub fn lexerdef() -> LexerDef<LexerTypesT> { ... }

     ...
   }

where:

modname is either:
- the module name specified by CTLexerBuilder::mod_name()
- or, if no module name was explicitly specified, then for the file /a/b/c.l the module name is c_l (i.e. the file’s leaf name, minus its extension, with a prefix of _l).

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pub fn process_file_in_src( self, srcp: &str, ) -> Result<(Option<HashSet<String>>, Option<HashSet<String>>), Box<dyn Error>>

👎Deprecated since 0.11.0: Please use lexer_in_src_dir() and build() instead

Given the filename a/b.l as input, statically compile the file src/a/b.l into a Rust module which can then be imported using lrlex_mod!("a/b.l"). This is a convenience function around process_file which makes it easier to compile .l files stored in a project’s src/ directory: please see process_file for additional constraints and information about the generated files.

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pub fn process_file<P, Q>( self, inp: P, outp: Q, ) -> Result<(Option<HashSet<String>>, Option<HashSet<String>>), Box<dyn Error>>
where P: AsRef<Path>, Q: AsRef<Path>,

👎Deprecated since 0.11.0: Please use lexer_in_src_dir() and build() instead

Statically compile the .l file inp into Rust, placing the output into the file outp. The latter defines a module as follows:

   mod modname {
     pub fn lexerdef() -> LexerDef<LexerTypesT::StorageT> { ... }

     ...
   }

where:

modname is either:
- the module name specified mod_name
- or, if no module name was explicitly specified, then for the file /a/b/c.l the module name is c_l (i.e. the file’s leaf name, minus its extension, with a prefix of _l).

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pub fn allow_missing_terms_in_lexer(self, allow: bool) -> Self

If passed false, tokens used in the grammar but not defined in the lexer will cause a panic at lexer generation time. Defaults to false.

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pub fn allow_missing_tokens_in_parser(self, allow: bool) -> Self

If passed false, tokens defined in the lexer but not used in the grammar will cause a panic at lexer generation time. Defaults to true (since lexers sometimes define tokens such as reserved words, which are intentionally not in the grammar).

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pub fn dot_matches_new_line(self, flag: bool) -> Self

Sets the regex::RegexBuilder option of the same name. The default value is true.

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pub fn multi_line(self, flag: bool) -> Self

Sets the regex::RegexBuilder option of the same name. The default value is true.

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