diff options
Diffstat (limited to '')
-rw-r--r-- | dhall_generated_parser/build.rs | 61 |
1 files changed, 42 insertions, 19 deletions
diff --git a/dhall_generated_parser/build.rs b/dhall_generated_parser/build.rs index 5275097..c562fad 100644 --- a/dhall_generated_parser/build.rs +++ b/dhall_generated_parser/build.rs @@ -26,16 +26,15 @@ fn main() -> std::io::Result<()> { rules.get_mut(&line[2..]).map(|x| x.silent = true); } } - rules.remove("http"); - rules.remove("url_path"); - rules.remove("simple_label"); - rules.remove("nonreserved_label"); let mut file = File::create(pest_path)?; writeln!(&mut file, "// AUTO-GENERATED FILE. See build.rs.")?; - writeln!(&mut file, "{}", render_rules_to_pest(rules).pretty(80))?; - writeln!(&mut file)?; + // TODO: this is a cheat; properly support RFC3986 URLs instead + rules.remove("url_path"); + writeln!(&mut file, "url_path = _{{ path }}")?; + + rules.remove("simple_label"); writeln!( &mut file, "simple_label = {{ @@ -43,30 +42,54 @@ fn main() -> std::io::Result<()> { | !keyword ~ simple_label_first_char ~ simple_label_next_char* }}" )?; - // TODO: this is a cheat; actually implement inline headers instead - writeln!( - &mut file, - "http = {{ - http_raw - ~ (whsp - ~ using - ~ whsp1 - ~ (import_hashed | ^\"(\" ~ whsp ~ import_hashed ~ whsp ~ ^\")\"))? - }}" - )?; - // TODO: this is a cheat; properly support RFC3986 URLs instead - writeln!(&mut file, "url_path = _{{ path }}")?; + + rules.remove("nonreserved_label"); writeln!( &mut file, "nonreserved_label = _{{ !(builtin ~ !simple_label_next_char) ~ label }}" )?; + + // Setup grammar for precedence climbing + rules.remove("operator_expression"); + writeln!(&mut file, r##" + import_alt = {{ "?" ~ whsp1 }} + bool_or = {{ "||" }} + natural_plus = {{ "+" ~ whsp1 }} + text_append = {{ "++" }} + list_append = {{ "#" }} + bool_and = {{ "&&" }} + natural_times = {{ "*" }} + bool_eq = {{ "==" }} + bool_ne = {{ "!=" }} + + operator = _{{ + equivalent | + bool_ne | + bool_eq | + natural_times | + combine_types | + prefer | + combine | + bool_and | + list_append | + text_append | + natural_plus | + bool_or | + import_alt + }} + operator_expression = {{ application_expression ~ (whsp ~ operator ~ whsp ~ application_expression)* }} + "##)?; + writeln!( &mut file, "final_expression = ${{ SOI ~ complete_expression ~ EOI }}" )?; + writeln!(&mut file)?; + writeln!(&mut file, "{}", render_rules_to_pest(rules).pretty(80))?; + // Generate pest parser manually to avoid spurious recompilations let derived = { let pest_path = "dhall.pest"; |