Check in the parser code

.circleci/config.yml

@@ -1,4 +1,12 @@
 version: 2.1
+jobs:
+  Ensure parser up-to-date:
+    docker:
+      - image: circleci/rust:latest
+    resource_class: small
+    steps:
+      - checkout
+      - run: ./parser-gen/ensure_parser_up_to_date.sh
 orbs:
   rust: glotrade/rust@0.1.3
 workflows:
@@ -7,3 +15,4 @@ workflows:
       - rust/check
       - rust/format
       - rust/test
+      - Ensure parser up-to-date

Cargo.lock

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+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"

Cargo.toml

@@ -2,4 +2,5 @@
 members = [
     "jexl-parser",
     "jexl-eval",
+    "parser-gen",
 ]

jexl-parser/Cargo.toml

@@ -3,14 +3,10 @@ edition = '2018'
 name = "jexl-parser"
 version = "0.1.7-alpha.0"
 authors = ["Mike Cooper <mythmon@gmail.com>", "The Sync Team <sync-team@mozilla.com>", "The Glean Team <glean-team@mozilla.com>"]
-build = "build.rs"
 description = "A JEXL parser written in Rust"
 license = "MPL-2.0"
 repository = "https://github.com/mozilla/jexl-rs"
 
 [dependencies]
-lalrpop-util = "0.19"
+lalrpop-util = { version = "0.19", features = ["lexer"] }
 regex = "1.3"
-
-[build-dependencies]
-lalrpop = {version = "0.19", features = ["lexer"]}

jexl-parser/src/.gitignore

@@ -1 +0,0 @@
-parser.rs

jexl-parser/src/lib.rs

@@ -3,9 +3,8 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 pub mod ast;
-mod parser {
-    include!(concat!(env!("OUT_DIR"), "/parser.rs"));
-}
+#[rustfmt::skip]
+mod parser;
 
 pub use lalrpop_util::ParseError;
 

parser-gen/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "parser-gen"
+version = "0.1.0"
+authors = ["Edouard Oger <eoger@fastmail.com>"]
+edition = "2018"
+license = "MPL-2.0"
+
+[dependencies]
+lalrpop = { version = "0.19", features = ["lexer"] }

parser-gen/README.md

@@ -0,0 +1,4 @@
+# jexl-parser generator
+
+We do not use `lalrpop` to generate the parser during the `jexl-parser` build phase.
+Why? because doing so introduces a lot of dependencies in Firefox's build. So instead we check-in the generated parser file, and run a CI job to ensure it's always fresh.

parser-gen/ensure_parser_up_to_date.sh

@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+
+cargo run --bin parser-gen
+
+CHANGES=$(git status --porcelain)
+
+if [ -n "$CHANGES" ]; then
+    git status
+    echo -e "\033[0;31mThe parser file looks outdated (git status is dirty). You can fix this yourself by running cargo run --bin parser-gen and then committing the result"
+fi

parser-gen/src/main.rs

@@ -3,5 +3,8 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 fn main() {
-    lalrpop::process_root().unwrap();
+    lalrpop::Configuration::new()
+        .generate_in_source_tree()
+        .process()
+        .unwrap();
 }