147 lines
3.4 KiB
Plaintext
147 lines
3.4 KiB
Plaintext
WHITESPACE = _{ " " | "\t" | "\r" | "\n" }
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COMMENT = _{ "//" ~ (!"\n" ~ ANY)* }
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program = { SOI ~ top_level* ~ EOI }
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// primitives
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identifier = @{ (ASCII_ALPHA | "_") ~ (ASCII_ALPHANUMERIC | "_")* }
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integer = @{ ASCII_DIGIT+ }
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float = @{ ASCII_DIGIT+ ~ "." ~ ASCII_DIGIT+ }
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boolean = { "true" | "false" }
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string_lit = { "\"" ~ inner_str ~ "\"" }
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inner_str = @{ (!"\"" ~ ("\\\"" | ANY))* }
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static_path = { identifier ~ ("::" ~ identifier)* }
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export = { "public" }
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mutable = { "mut" }
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sharp = _{ "#" }
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var_decl = { type_expr ~ mutable? ~ identifier }
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// ================= TOP LEVEL =================
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attribute = {
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"#" ~ "[" ~ (structured_style | list_style | pair_attr | simple_style) ~ "]"
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}
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// Simple: #[test]
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simple_style = { static_path }
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// #[derive(PartialEq, PartialOrd)]
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list_style = { static_path ~ "(" ~ identifier ~ ("," ~ identifier)* ~ ","? ~ ")" }
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// #[link(name = "readline")]
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structured_style = { static_path ~ "(" ~ pair_attr ~ ("," ~ pair_attr)* ~ ","? ~ ")" }
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pair_attr = { identifier ~ "=" ~ primary }
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top_level = { attribute* ~ (import | function_decl | struct_decl) }
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import = { sharp ~ "include" ~ "<" ~ static_path ~ ">" }
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field_list = { field ~ ("," ~ field)* ~ ","? }
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field = { export? ~ type_expr ~ identifier }
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param_list = { var_decl ~ ("," ~ var_decl)* ~ ","? }
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struct_decl = {
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export? ~ "struct" ~ identifier ~ "{" ~ field_list? ~ "}"
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}
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function_decl = {
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export? ~ type_expr ~ identifier ~ "(" ~ param_list? ~ ")" ~ block
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}
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// ================= STATEMENTS =================
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block = { "{" ~ statement_list ~ "}" }
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statement_list = { statement* }
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statement = _{
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expr_stmt
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| var_decl_statement
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| assign_statement
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| if_stmt
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| while_stmt
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| return_stmt
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| break_stmt
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| continue_stmt
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| block
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}
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// --- basic statements ---
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expr_stmt = { expr ~ ";" }
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return_stmt = { "return" ~ expr? ~ ";" }
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break_stmt = { "break" ~ ";" }
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continue_stmt = { "continue" ~ ";" }
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var_decl_statement = { var_decl ~ ("=" ~ expr)? ~ ";" }
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assign_statement = { expr ~ "=" ~ expr ~ ";" }
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if_stmt = {
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"if" ~ "(" ~ expr ~ ")" ~ statement ~ ("else" ~ statement)?
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}
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while_stmt = {
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"while" ~ "(" ~ expr ~ ")" ~ statement
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}
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// ================= EXPRESSIONS =================
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tuple_type = { "(" ~ (type_expr ~ ("," ~ type_expr)*)? ~ ")" }
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path_type = { static_path ~ ("<" ~ (type_expr ~ ("," ~ type_expr)*)? ~ ">")? }
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ref_type = { mutable? ~ "*" }
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type_expr = { (path_type | tuple_type) ~ ref_type* }
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macro_inner_v = {
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"(" ~ macro_inner_v* ~ ")"
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| (!("(" | ")") ~ ANY)
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}
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tuple = { "(" ~ (expr ~ ("," ~ expr)*)? ~ ")" }
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primary = {
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float
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| integer
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| boolean
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| string_lit
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| static_path
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| tuple
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}
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postfix = {
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field_px
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| call_px
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| macro_call_px
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| struct_px
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| index_px
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| binary_px
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}
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field_px = { "." ~ identifier }
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call_px = { "(" ~ (expr ~ ("," ~ expr)*)? ~ ")" }
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macro_call_px = { "!" ~ "(" ~ macro_inner_v* ~ ")" }
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struct_px = { "{" ~ (struct_field_decl ~ ("," ~ struct_field_decl)*)? ~ ","? ~ "}" }
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index_px = { "[" ~ expr ~ "]" }
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binary_px = { bin_op ~ expr }
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bin_op = { "+" | "-" | "*" | "/" | "%" | "==" | "!=" | "<" | ">" | "<=" | ">=" }
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struct_field_decl = { identifier ~ ":" ~ expr }
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prefix = {
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deref_px
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| mut_ref_px
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| ref_px
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}
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deref_px = { "*" }
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mut_ref_px = { "&" ~ mutable }
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ref_px = { "&" }
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expr = {
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prefix* ~ primary ~ postfix*
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}
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