WIP(schema-wasm): support schema split into multiple files

prisma-fmt/src/code_actions.rs

@@ -31,8 +31,13 @@ pub(crate) fn available_actions(schema: String, params: CodeActionParams) -> Vec
 
     let datasource = config.datasources.first();
 
-    for source in validated_schema.db.ast().sources() {
-        relation_mode::edit_referential_integrity(&mut actions, &params, validated_schema.db.source(), source)
+    for source in validated_schema.db.ast_assert_single().sources() {
+        relation_mode::edit_referential_integrity(
+            &mut actions,
+            &params,
+            validated_schema.db.source_assert_single(),
+            source,
+        )
     }
 
     // models AND views
@@ -45,21 +50,27 @@ pub(crate) fn available_actions(schema: String, params: CodeActionParams) -> Vec
             multi_schema::add_schema_block_attribute_model(
                 &mut actions,
                 &params,
-                validated_schema.db.source(),
+                validated_schema.db.source_assert_single(),
                 config,
                 model,
             );
 
-            multi_schema::add_schema_to_schemas(&mut actions, &params, validated_schema.db.source(), config, model);
+            multi_schema::add_schema_to_schemas(
+                &mut actions,
+                &params,
+                validated_schema.db.source_assert_single(),
+                config,
+                model,
+            );
         }
 
         if matches!(datasource, Some(ds) if ds.active_provider == "mongodb") {
-            mongodb::add_at_map_for_id(&mut actions, &params, validated_schema.db.source(), model);
+            mongodb::add_at_map_for_id(&mut actions, &params, validated_schema.db.source_assert_single(), model);
 
             mongodb::add_native_for_auto_id(
                 &mut actions,
                 &params,
-                validated_schema.db.source(),
+                validated_schema.db.source_assert_single(),
                 model,
                 datasource.unwrap(),
             );
@@ -71,7 +82,7 @@ pub(crate) fn available_actions(schema: String, params: CodeActionParams) -> Vec
             multi_schema::add_schema_block_attribute_enum(
                 &mut actions,
                 &params,
-                validated_schema.db.source(),
+                validated_schema.db.source_assert_single(),
                 config,
                 enumerator,
             )
@@ -88,15 +99,15 @@ pub(crate) fn available_actions(schema: String, params: CodeActionParams) -> Vec
             relations::add_referenced_side_unique(
                 &mut actions,
                 &params,
-                validated_schema.db.source(),
+                validated_schema.db.source_assert_single(),
                 complete_relation,
             );
 
             if relation.is_one_to_one() {
                 relations::add_referencing_side_unique(
                     &mut actions,
                     &params,
-                    validated_schema.db.source(),
+                    validated_schema.db.source_assert_single(),
                     complete_relation,
                 );
             }
@@ -105,7 +116,7 @@ pub(crate) fn available_actions(schema: String, params: CodeActionParams) -> Vec
                 relations::add_index_for_relation_fields(
                     &mut actions,
                     &params,
-                    validated_schema.db.source(),
+                    validated_schema.db.source_assert_single(),
                     complete_relation.referencing_field(),
                 );
             }
@@ -114,7 +125,7 @@ pub(crate) fn available_actions(schema: String, params: CodeActionParams) -> Vec
                 relation_mode::replace_set_default_mysql(
                     &mut actions,
                     &params,
-                    validated_schema.db.source(),
+                    validated_schema.db.source_assert_single(),
                     complete_relation,
                     config,
                 )

prisma-fmt/src/code_actions/multi_schema.rs

@@ -142,13 +142,12 @@ pub(super) fn add_schema_to_schemas(
                 formatted_attribute,
                 true,
                 // todo: update spans so that we can just append to the end of the _inside_ of the array. Instead of needing to re-append the `]` or taking the span end -1
-                Span::new(span.start, span.end - 1),
+                Span::new(span.start, span.end - 1, psl::parser_database::FileId::ZERO),
                 params,
             )
         }
         None => {
-            let has_properties = datasource.provider_defined()
-                || datasource.url_defined()
+            let has_properties = datasource.provider_defined() | datasource.url_defined()
                 || datasource.direct_url_defined()
                 || datasource.shadow_url_defined()
                 || datasource.relation_mode_defined()

prisma-fmt/src/get_config.rs

@@ -1,14 +1,14 @@
-use psl::Diagnostics;
+use psl::{Diagnostics, ValidatedSchema};
 use serde::Deserialize;
 use serde_json::json;
 use std::collections::HashMap;
 
-use crate::validate::SCHEMA_PARSER_ERROR_CODE;
+use crate::{schema_file_input::SchemaFileInput, validate::SCHEMA_PARSER_ERROR_CODE};
 
 #[derive(Deserialize, Debug)]
 #[serde(rename_all = "camelCase")]
 struct GetConfigParams {
-    prisma_schema: String,
+    prisma_schema: SchemaFileInput,
     #[serde(default)]
     ignore_env_var_errors: bool,
     #[serde(default)]
@@ -43,29 +43,38 @@ pub(crate) fn get_config(params: &str) -> Result<String, String> {
 }
 
 fn get_config_impl(params: GetConfigParams) -> Result<serde_json::Value, GetConfigError> {
-    let wrap_get_config_err = |errors: Diagnostics| -> GetConfigError {
-        use std::fmt::Write as _;
-
-        let mut full_error = errors.to_pretty_string("schema.prisma", &params.prisma_schema);
-        write!(full_error, "\nValidation Error Count: {}", errors.errors().len()).unwrap();
-
-        GetConfigError {
-            // this mirrors user_facing_errors::common::SchemaParserError
-            error_code: Some(SCHEMA_PARSER_ERROR_CODE),
-            message: full_error,
-        }
-    };
-
-    let mut config = psl::parse_configuration(&params.prisma_schema).map_err(wrap_get_config_err)?;
+    let mut schema = psl::validate_multi_file(params.prisma_schema.into());
+    if schema.diagnostics.has_errors() {
+        return Err(create_get_config_error(&schema, &schema.diagnostics));
+    }
 
     if !params.ignore_env_var_errors {
         let overrides: Vec<(_, _)> = params.datasource_overrides.into_iter().collect();
-        config
+        schema
+            .configuration
             .resolve_datasource_urls_prisma_fmt(&overrides, |key| params.env.get(key).map(String::from))
-            .map_err(wrap_get_config_err)?;
+            .map_err(|diagnostics| create_get_config_error(&schema, &diagnostics))?;
     }
 
-    Ok(psl::get_config(&config))
+    Ok(psl::get_config(&schema.configuration))
+}
+
+fn create_get_config_error(schema: &ValidatedSchema, diagnostics: &Diagnostics) -> GetConfigError {
+    use std::fmt::Write as _;
+
+    let mut rendered_diagnostics = schema.render_diagnostics(diagnostics);
+    write!(
+        rendered_diagnostics,
+        "\nValidation Error Count: {}",
+        diagnostics.errors().len()
+    )
+    .unwrap();
+
+    GetConfigError {
+        // this mirrors user_facing_errors::common::SchemaParserError
+        error_code: Some(SCHEMA_PARSER_ERROR_CODE),
+        message: rendered_diagnostics,
+    }
 }
 
 #[cfg(test)]

prisma-fmt/src/lib.rs

@@ -3,8 +3,10 @@ mod code_actions;
 mod get_config;
 mod get_dmmf;
 mod lint;
+mod merge_schemas;
 mod native;
 mod preview;
+mod schema_file_input;
 mod text_document_completion;
 mod validate;
 
@@ -42,6 +44,13 @@ pub fn code_actions(schema: String, params: &str) -> String {
     serde_json::to_string(&actions).unwrap()
 }
 
+/// Given a list of Prisma schema files (and their locations), returns the merged schema.
+/// This is useful for `@prisma/client` generation, where the client needs a single - potentially large - schema,
+/// while still allowing the user to split their schema copies into multiple files.
+pub fn merge_schemas(params: String) -> String {
+    merge_schemas::merge_schemas(&params)
+}
+
 /// The two parameters are:
 /// - The Prisma schema to reformat, as a string.
 /// - An LSP
@@ -225,7 +234,7 @@ pub(crate) fn range_to_span(range: Range, document: &str) -> ast::Span {
     let start = position_to_offset(&range.start, document).unwrap();
     let end = position_to_offset(&range.end, document).unwrap();
 
-    ast::Span::new(start, end)
+    ast::Span::new(start, end, psl::parser_database::FileId::ZERO)
 }
 
 /// Gives the LSP position right after the given span.

prisma-fmt/src/merge_schemas.rs

@@ -0,0 +1,127 @@
+use psl::reformat_validated_schema_into_single;
+use serde::Deserialize;
+
+use crate::schema_file_input::SchemaFileInput;
+
+#[derive(Debug, Deserialize)]
+pub struct MergeSchemasParams {
+    schema: SchemaFileInput,
+}
+
+pub(crate) fn merge_schemas(params: &str) -> String {
+    let params: MergeSchemasParams = match serde_json::from_str(params) {
+        Ok(params) => params,
+        Err(serde_err) => {
+            panic!("Failed to deserialize GetDmmfParams: {serde_err}");
+        }
+    };
+
+    let params_as_vec: Vec<_> = params.schema.into();
+    let validated_schema = psl::validate_multi_file(params_as_vec.clone());
+
+    // diagnostics aren't supposed to have errors, as they should be validated before-hand.
+    if validated_schema.diagnostics.has_errors() {
+        panic!("Invalid schemas.");
+    }
+
+    let indent_width = 2usize;
+    reformat_validated_schema_into_single(validated_schema, indent_width).unwrap()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use expect_test::expect;
+    use serde_json::json;
+
+    #[test]
+    fn merge_two_valid_schemas_succeeds() {
+        let schema = vec![
+            (
+                "b.prisma",
+                r#"
+                model B {
+                    id String @id
+                    a A?
+                }
+            "#,
+            ),
+            (
+                "a.prisma",
+                r#"
+                datasource db {
+                    provider = "postgresql"
+                    url = env("DBURL")
+                }
+
+                model A {
+                    id String @id
+                    b_id String @unique
+                    b B @relation(fields: [b_id], references: [id])
+                }
+            "#,
+            ),
+        ];
+
+        let request = json!({
+            "schema": schema,
+        });
+
+        let expected = expect![[r#"
+            model B {
+              id String @id
+              a  A?
+            }
+
+            datasource db {
+              provider = "postgresql"
+              url      = env("DBURL")
+            }
+
+            model A {
+              id   String @id
+              b_id String @unique
+              b    B      @relation(fields: [b_id], references: [id])
+            }
+        "#]];
+
+        let response = merge_schemas(&request.to_string());
+        expected.assert_eq(&response);
+    }
+
+    #[test]
+    #[should_panic]
+    fn merge_two_invalid_schemas_panics() {
+        let schema = vec![
+            (
+                "b.prisma",
+                r#"
+                model B {
+                    id String @id
+                    a A?
+                }
+            "#,
+            ),
+            (
+                "a.prisma",
+                r#"
+                datasource db {
+                    provider = "postgresql"
+                    url = env("DBURL")
+                }
+
+                model A {
+                    id String @id
+                    b_id String @unique
+                }
+            "#,
+            ),
+        ];
+
+        let request = json!({
+            "schema": schema,
+        });
+
+        merge_schemas(&request.to_string());
+    }
+}

prisma-fmt/src/schema_file_input.rs

@@ -0,0 +1,26 @@
+use psl::SourceFile;
+use serde::Deserialize;
+
+/// Struct for supporting multiple files
+/// in a backward-compatible way: can either accept
+/// a single file contents or vector of (filePath, content) tuples.
+/// Can be converted to the input for `psl::validate_multi_file` from
+/// any of the variants.
+#[derive(Deserialize, Debug)]
+#[serde(untagged)]
+pub(crate) enum SchemaFileInput {
+    Single(String),
+    Multiple(Vec<(String, String)>),
+}
+
+impl From<SchemaFileInput> for Vec<(String, SourceFile)> {
+    fn from(value: SchemaFileInput) -> Self {
+        match value {
+            SchemaFileInput::Single(content) => vec![("schema.prisma".to_owned(), content.into())],
+            SchemaFileInput::Multiple(file_list) => file_list
+                .into_iter()
+                .map(|(filename, content)| (filename, content.into()))
+                .collect(),
+        }
+    }
+}

prisma-fmt/src/text_document_completion.rs

@@ -41,7 +41,7 @@ pub(crate) fn completion(schema: String, params: CompletionParams) -> Completion
 
     let db = {
         let mut diag = Diagnostics::new();
-        ParserDatabase::new(source_file, &mut diag)
+        ParserDatabase::new_single_file(source_file, &mut diag)
     };
 
     let ctx = CompletionContext {
@@ -91,7 +91,7 @@ impl<'a> CompletionContext<'a> {
 }
 
 fn push_ast_completions(ctx: CompletionContext<'_>, completion_list: &mut CompletionList) {
-    match ctx.db.ast().find_at_position(ctx.position) {
+    match ctx.db.ast_assert_single().find_at_position(ctx.position) {
         ast::SchemaPosition::Model(
             _model_id,
             ast::ModelPosition::Field(_, ast::FieldPosition::Attribute("relation", _, Some(attr_name))),
@@ -190,7 +190,7 @@ fn ds_has_prop(ctx: CompletionContext<'_>, prop: &str) -> bool {
 
 fn push_namespaces(ctx: CompletionContext<'_>, completion_list: &mut CompletionList) {
     for (namespace, _) in ctx.namespaces() {
-        let insert_text = if add_quotes(ctx.params, ctx.db.source()) {
+        let insert_text = if add_quotes(ctx.params, ctx.db.source_assert_single()) {
             format!(r#""{namespace}""#)
         } else {
             namespace.to_string()