# Rust syntax file for Diffuse
# Copyright (C) 2022 Alexander Lopatin (@alopatindev), Romain Failliot <romain@foolstep.com>

# DISCLAIMER: this is a raw support for Rust language, help wanted.

syntax Rust normal text
syntax_files Rust '\.rs$'

# Colours
colour rust_comment 0.2 0.4 0.64
colour rust_fixme 1.0 0.5 0.0
colour rust_import 0.77 0.63 0.0
colour rust_keyword 0.77 0.63 0.0
colour rust_type 0.3 0.6 0.02
colour rust_literal 1.0 0.2 0.8
colour rust_char 0.8 0.0 0.0
colour rust_string 0.8 0.0 0.0
colour rust_escapedchar 0.46 0.31 0.48
colour rust_string_multilinechar 0.46 0.31 0.48
colour rust_punctuation 0.5 0.5 0.5
colour rust_macro 0.01 0.6 0.9

# Whitespace (TODO)
# Doc: https://doc.rust-lang.org/reference/whitespace.html
syntax_pattern normal normal text '[ \t\r\n]+'

# Macro (TODO)
#syntax_pattern normal macro rust_macro '[a-z_]+[a-z0-9_]*!' ignorecase

# Line comment
# Doc: https://doc.rust-lang.org/reference/comments.html
syntax_pattern normal line_comment rust_comment '//'
syntax_pattern line_comment normal rust_comment '(\r\n|\r|\n)$'
syntax_pattern line_comment line_comment rust_comment '\\(\r\n|\r|\n)$'
syntax_pattern line_comment line_comment rust_fixme '\b(TODO|FIXME|XXX|NOTE)\b'
syntax_pattern line_comment line_comment rust_comment '.[^\\TFX\r\n]*'

# Block comment
syntax_pattern normal block_comment rust_comment '/\*'
syntax_pattern block_comment normal rust_comment '\*/'
syntax_pattern block_comment block_comment rust_fixme '\b(TODO|FIXME|XXX|NOTE)\b'
syntax_pattern block_comment block_comment rust_comment '.[^\*TFX]*'

# Keywords (TODO)
# Doc: https://doc.rust-lang.org/reference/keywords.html#weak-keywords
#syntax_pattern normal normal rust_string '\b\'[a-z_]+[a-z0-9_]*\b' ignorecase
#syntax_pattern normal normal rust_string '\b\'[a-z_]+\b' ignorecase
syntax_pattern normal normal rust_string "\b'[a-z_]+\b" ignorecase

# Char
syntax_pattern normal normal rust_char "'.'"
syntax_pattern normal char rust_char "'(?=\\\\)"
syntax_pattern char normal rust_char "'"
syntax_pattern char char rust_escapedchar "\\\\([0-7]{1,3}|x[0-9a-f]{1,2}|u\{[0-9a-f]{1,6}\}|.)"

# String
# Doc: https://doc.rust-lang.org/reference/tokens.html#string-literals
syntax_pattern normal string rust_string '"'
syntax_pattern string normal rust_string '"'
syntax_pattern string string rust_escapedchar '(\\([0-7]{1,3}|x[0-9a-f]{1,2}|u\{[0-9a-f]{1,6}\}|.))+' ignorecase
syntax_pattern string string rust_string_multilinechar '\\$'
syntax_pattern string string rust_string '[^\\"]+'

# Raw quote-string, level 0
# Doc: https://doc.rust-lang.org/reference/tokens.html#raw-string-literals
syntax_pattern normal raw_string_0 rust_string 'r"'
syntax_pattern raw_string_0 normal rust_string '"'
syntax_pattern raw_string_0 raw_string_0 rust_string '[^"$]+'

# Raw sharp-string, level 1
syntax_pattern normal raw_string_1 rust_string 'r#"'
syntax_pattern raw_string_1 normal rust_string '"#'
syntax_pattern raw_string_1 raw_string_1 rust_string '.*?((?="#)|\r?\n)'

# Raw sharp-string, level 2
syntax_pattern normal raw_string_2 rust_string 'r##"'
syntax_pattern raw_string_2 normal rust_string '"##'
syntax_pattern raw_string_2 raw_string_2 rust_string '.*?((?="##)|\r?\n)'

# Raw sharp-string, level 3
syntax_pattern normal raw_string_3 rust_string 'r###"'
syntax_pattern raw_string_3 normal rust_string '"###'
syntax_pattern raw_string_3 raw_string_3 rust_string '.*?((?="###)|\r?\n)'

# Raw sharp-string, level 4
syntax_pattern normal raw_string_4 rust_string 'r####"'
syntax_pattern raw_string_4 normal rust_string '"####'
syntax_pattern raw_string_4 raw_string_4 rust_string '.*?((?="####)|\r?\n)'

# Raw sharp-string, level 5
# Limit is 256 '#', but 5 seems reasonable for now
syntax_pattern normal raw_string_5 rust_string 'r#####"'
syntax_pattern raw_string_5 normal rust_string '"#####'
syntax_pattern raw_string_5 raw_string_5 rust_string '.*?((?="#####)|\r?\n)'

# Suffixes (TODO)
# Doc: https://doc.rust-lang.org/reference/tokens.html#suffixes
syntax_pattern normal normal rust_literal '\b[0-9_]+(isize|usize|char|bool|u8|u16|u32|u64|u128|f32|f64|i8|i16|i32|i64|i128|)\b'
syntax_pattern normal normal rust_literal '\b0b[01_]+(isize|usize|char|bool|u8|u16|u32|u64|u128|f32|f64|i8|i16|i32|i64|i128|)\b'
syntax_pattern normal normal rust_literal '\b0o[0-7_]+(isize|usize|char|bool|u8|u16|u32|u64|u128|f32|f64|i8|i16|i32|i64|i128|)\b'
syntax_pattern normal normal rust_literal '\b0x[0-9a-f_]+(isize|usize|char|bool|u8|u16|u32|u64|u128|f32|f64|i8|i16|i32|i64|i128|)\b'
syntax_pattern normal normal rust_literal '\b[0-9_]+E\+[0-9_]+(f32|f64)\b'
syntax_pattern normal normal rust_literal '\b(true|false)\b'

# import keywords
syntax_pattern normal normal rust_import '\b(use|mod)\b'

# typing keywords
syntax_pattern normal normal rust_type '\b(isize|usize|char|bool|u8|u16|u32|u64|u128|f32|f64|i8|i16|i32|i64|i128|str|Self)\b'

# keywords
syntax_pattern normal normal rust_keyword '\b(as|break|const|continue|crate|else|enum|extern|false|fn|for|if|impl|in|let|loop|match|move|mut|pub|ref|return|self|Self|static|struct|super|trait|true|type|unsafe|where|while|async|await|dyn|abstract|become|box|do|final|macro|override|priv|typeof|unsized|virtual|yield|try|union)\b'

# punctuation
syntax_pattern normal normal rust_punctuation '[!~%\|\&\^\(\)\<\>\*\-\+=\{\}\[\]:;,\?$]+'
syntax_pattern normal normal rust_punctuation '[/\.]'

# parsing optimization
syntax_pattern normal normal text '[a-z_][a-z_0-9]*' ignorecase