include and "include as"

packages/squiggle-lang/__tests__/Reducer/Reducer_Bindings/Reducer_Bindings_test.res

@@ -0,0 +1,27 @@
+@@warning("-44")
+module InternalExpressionValue = ReducerInterface_InternalExpressionValue
+module Bindings = Reducer_Bindings
+
+open Jest
+open Expect
+open Expect.Operators
+
+describe("Name Space", () => {
+  let value = InternalExpressionValue.IEvNumber(1967.0)
+  let nameSpace = Bindings.emptyNameSpace->Bindings.set("value", value)
+  test("get", () => {
+    expect(Bindings.get(nameSpace, "value")) == Some(value)
+  })
+
+  test("chain and get", () => {
+    let mainNameSpace = Bindings.emptyNameSpace->Bindings.chainTo([nameSpace])
+    expect(Bindings.get(mainNameSpace, "value")) == Some(value)
+  })
+
+  test("chain and set", () => {
+    let mainNameSpace0 = Bindings.emptyNameSpace->Bindings.chainTo([nameSpace])
+    let mainNameSpace =
+      mainNameSpace0->Bindings.set("value", InternalExpressionValue.IEvNumber(1968.0))
+    expect(Bindings.get(mainNameSpace, "value")) == Some(InternalExpressionValue.IEvNumber(1968.0))
+  })
+})

packages/squiggle-lang/__tests__/ReducerProject/ReducerProject_includes_test.res

@@ -7,7 +7,7 @@ open Jest
 open Expect
 open Expect.Operators
 
-Only.describe("Parse includes", () => {
+describe("Parse includes", () => {
   let project = Project.createProject()
   Project.setSource(
     project,
@@ -30,4 +30,92 @@ x=1`,
     | Error(error) => fail(error->Reducer_ErrorValue.errorToString)
     }
   })
+  let internalProject = project->Project.T.Private.castToInternalProject
+  test("past chain", () => {
+    expect(Project.Private.getPastChain(internalProject, "main")) == ["common"]
+  })
+  test("import as variables", () => {
+    expect(Project.Private.getIncludesAsVariables(internalProject, "main")) == []
+  })
+})
+
+describe("Parse includes", () => {
+  let project = Project.createProject()
+  Project.setSource(
+    project,
+    "main",
+    `
+#include 'common'
+#include 'myModule' as myVariable
+x=1`,
+  )
+  Project.parseIncludes(project, "main")
+
+  test("dependencies", () => {
+    expect(Project.getDependencies(project, "main")) == ["common", "myModule"]
+  })
+
+  test("dependents", () => {
+    expect(Project.getDependents(project, "main")) == []
+  })
+
+  test("getIncludes", () => {
+    let mainIncludes = Project.getIncludes(project, "main")
+    switch mainIncludes {
+    | Ok(includes) => expect(includes) == ["common", "myModule"]
+    | Error(error) => fail(error->Reducer_ErrorValue.errorToString)
+    }
+  })
+
+  let internalProject = project->Project.T.Private.castToInternalProject
+
+  test("direct past chain", () => {
+    expect(Project.Private.getPastChain(internalProject, "main")) == ["common"]
+  })
+
+  test("direct includes", () => {
+    expect(Project.Private.getDirectIncludes(internalProject, "main")) == ["common"]
+  })
+
+  test("include as variables", () => {
+    expect(Project.Private.getIncludesAsVariables(internalProject, "main")) == [
+        ("myVariable", "myModule"),
+      ]
+  })
+})
+
+describe("Parse multiple direct includes", () => {
+  let project = Project.createProject()
+  Project.setSource(
+    project,
+    "main",
+    `
+#include 'common' 
+#include 'common2'
+#include 'myModule' as myVariable
+x=1`,
+  )
+  Project.parseIncludes(project, "main")
+  test("dependencies", () => {
+    expect(Project.getDependencies(project, "main")) == ["common", "common2", "myModule"]
+  })
+  test("dependents", () => {
+    expect(Project.getDependents(project, "main")) == []
+  })
+  test("getIncludes", () => {
+    let mainIncludes = Project.getIncludes(project, "main")
+    switch mainIncludes {
+    | Ok(includes) => expect(includes) == ["common", "common2", "myModule"]
+    | Error(error) => fail(error->Reducer_ErrorValue.errorToString)
+    }
+  })
+  let internalProject = project->Project.T.Private.castToInternalProject
+  test("direct past chain", () => {
+    expect(Project.getPastChain(project, "main")) == ["common", "common2"]
+  })
+  test("include as variables", () => {
+    expect(Project.Private.getIncludesAsVariables(internalProject, "main")) == [
+        ("myVariable", "myModule"),
+      ]
+  })
 })

packages/squiggle-lang/__tests__/ReducerProject/ReducerProject_test.res

@@ -14,11 +14,9 @@ let runFetchResult = (project, sourceId) => {
   Project.getResult(project, sourceId)->InternalExpressionValue.toStringResult
 }
 
-let runFetchBindings = (project, sourceId) => {
+let runFetchFlatBindings = (project, sourceId) => {
   Project.run(project, sourceId)
-  Project.getBindings(project, sourceId)
+  Project.getBindings(project, sourceId)->InternalExpressionValue.toStringBindings
-  ->InternalExpressionValue.IEvBindings
-  ->InternalExpressionValue.toString
 }
 
 test("setting continuation", () => {
@@ -51,7 +49,7 @@ test("test library", () => {
 test("test bindings", () => {
   let project = Project.createProject()
   Project.setSource(project, "variables", "myVariable=666")
-  runFetchBindings(project, "variables")->expect->toBe("@{myVariable: 666}")
+  runFetchFlatBindings(project, "variables")->expect->toBe("@{myVariable: 666}")
 })
 
 describe("project1", () => {
@@ -59,6 +57,7 @@ describe("project1", () => {
   Project.setSource(project, "first", "x=1")
   Project.setSource(project, "main", "x")
   Project.setContinues(project, "main", ["first"])
+  let internalProject = project->Project.T.Private.castToInternalProject
 
   test("runOrder", () => {
     expect(Project.getRunOrder(project)) == ["first", "main"]
@@ -75,11 +74,19 @@ describe("project1", () => {
   test("dependencies main", () => {
     expect(Project.getDependencies(project, "main")) == ["first"]
   })
+
+  test("past chain first", () => {
+    expect(Project.Private.getPastChain(internalProject, "first")) == []
+  })
+  test("past chain main", () => {
+    expect(Project.Private.getPastChain(internalProject, "main")) == ["first"]
+  })
+
   test("test result", () => {
     runFetchResult(project, "main")->expect->toBe("Ok(1)")
   })
   test("test bindings", () => {
-    runFetchBindings(project, "main")->expect->toBe("@{x: 1}")
+    runFetchFlatBindings(project, "first")->expect->toBe("@{x: 1}")
   })
 })
 
@@ -113,7 +120,7 @@ describe("project2", () => {
     runFetchResult(project, "main")->expect->toBe("Ok(2)")
   })
   test("test bindings", () => {
-    runFetchBindings(project, "main")->expect->toBe("@{x: 1,y: 2}")
+    runFetchFlatBindings(project, "main")->expect->toBe("@{x: 1,y: 2}")
   })
 })
 
@@ -169,6 +176,6 @@ describe("project with include", () => {
     runFetchResult(project, "main")->expect->toBe("Ok(2)")
   })
   test("test bindings", () => {
-    runFetchBindings(project, "main")->expect->toBe("@{common: 0,x: 1,y: 2}")
+    runFetchFlatBindings(project, "main")->expect->toBe("@{common: 0,x: 1,y: 2}")
   })
 })

packages/squiggle-lang/__tests__/ReducerProject/ReducerProject_tutorial_3_includes_test.res

@@ -153,4 +153,27 @@ Here we will finally proceed to a real life scenario. */
       })
     })
   })
+
+  describe("Includes myFile as myVariable", () => {
+    /* Instead of including into global space you can also put a module into a record variable */
+    let project = Project.createProject()
+    Project.setSource(
+      project,
+      "main",
+      `
+    #include "common" as common
+    x=1
+    `,
+    )
+    Project.parseIncludes(project, "main")
+    test("getDependencies", () => {
+      Project.getDependencies(project, "main")->expect == ["common"]
+    })
+    test("getIncludes", () => {
+      switch Project.getIncludes(project, "main") {
+      | Ok(includes) => includes->expect == ["common"]
+      | Error(err) => err->Reducer_ErrorValue.errorToString->fail
+      }
+    })
+  })
 })

packages/squiggle-lang/src/rescript/ForTS/ForTS_ReducerProject.res

@@ -105,6 +105,11 @@ let getIncludes = (project: reducerProject, sourceId: string): result<
   reducerErrorValue,
 > => project->T.Private.castToInternalProject->Private.getIncludes(sourceId)
 
+/* Other sources contributing to the global namespace of this source. */
+@genType
+let getPastChain = (project: reducerProject, sourceId: string): array<string> =>
+  project->T.Private.castToInternalProject->Private.getPastChain(sourceId)
+
 /*
 Answers the source codes after which this source code is continuing
 */
@@ -183,7 +188,7 @@ let runAll = (project: reducerProject): unit =>
   project->T.Private.castToInternalProject->Private.runAll
 
 /*
-Get the bindings after running this source file or the project
+Get the bindings after running this source fil. The bindings are local to the source
 */
 @genType
 let getBindings = (project: reducerProject, sourceId: string): squiggleValue_Module =>

packages/squiggle-lang/src/rescript/Reducer/Reducer_Bindings/Reducer_Bindings.res

@@ -1,5 +1,5 @@
 // Only Bindings as the global module is supported
-// Other module operations such as import export will be prepreocessed jobs
+// Other module operations such as import export will be preprocessed jobs
 
 module ExpressionT = Reducer_Expression_T
 module InternalExpressionValue = ReducerInterface_InternalExpressionValue
@@ -13,8 +13,7 @@ type t = ReducerInterface_InternalExpressionValue.nameSpace
 let typeAliasesKey = "_typeAliases_"
 let typeReferencesKey = "_typeReferences_"
 
-let getType = (nameSpace: t, id: string) => {
+let getType = (NameSpace(container): t, id: string) => {
-  let NameSpace(container) = nameSpace
   Belt.Map.String.get(container, typeAliasesKey)->Belt.Option.flatMap(aliases =>
     switch aliases {
     | IEvRecord(r) => Belt.Map.String.get(r, id)
@@ -23,8 +22,7 @@ let getType = (nameSpace: t, id: string) => {
   )
 }
 
-let getTypeOf = (nameSpace: t, id: string) => {
+let getTypeOf = (NameSpace(container): t, id: string) => {
-  let NameSpace(container) = nameSpace
   Belt.Map.String.get(container, typeReferencesKey)->Belt.Option.flatMap(defs =>
     switch defs {
     | IEvRecord(r) => Belt.Map.String.get(r, id)
@@ -33,44 +31,39 @@ let getTypeOf = (nameSpace: t, id: string) => {
   )
 }
 
-let getWithDefault = (nameSpace: t, id: string, default) => {
+let getWithDefault = (NameSpace(container): t, id: string, default) =>
-  let NameSpace(container) = nameSpace
+  switch Belt.Map.String.get(container, id) {
-  Belt.Map.String.getWithDefault(container, id, default)
+  | Some(v) => v
-}
+  | None => default
+  }
 
-let get = (nameSpace: t, id: string) => {
+let get = (NameSpace(container): t, id: string) => Belt.Map.String.get(container, id)
-  let NameSpace(container) = nameSpace
-  Belt.Map.String.get(container, id)
-}
 
 let emptyMap: map = Belt.Map.String.empty
 
-let setTypeAlias = (nameSpace: t, id: string, value): t => {
+let setTypeAlias = (NameSpace(container): t, id: string, value): t => {
-  let NameSpace(container) = nameSpace
   let rValue = Belt.Map.String.getWithDefault(container, typeAliasesKey, IEvRecord(emptyMap))
   let r = switch rValue {
   | IEvRecord(r) => r
   | _ => emptyMap
   }
   let r2 = Belt.Map.String.set(r, id, value)->IEvRecord
-  Belt.Map.String.set(container, typeAliasesKey, r2)->NameSpace
+  NameSpace(Belt.Map.String.set(container, typeAliasesKey, r2))
 }
 
-let setTypeOf = (nameSpace: t, id: string, value): t => {
+let setTypeOf = (NameSpace(container): t, id: string, value): t => {
-  let NameSpace(container) = nameSpace
   let rValue = Belt.Map.String.getWithDefault(container, typeReferencesKey, IEvRecord(emptyMap))
   let r = switch rValue {
   | IEvRecord(r) => r
   | _ => emptyMap
   }
   let r2 = Belt.Map.String.set(r, id, value)->IEvRecord
-  Belt.Map.String.set(container, typeReferencesKey, r2)->NameSpace
+  NameSpace(Belt.Map.String.set(container, typeReferencesKey, r2))
 }
 
-let set = (nameSpace: t, id: string, value): t => {
+let set = (NameSpace(container): t, id: string, value): t => NameSpace(
-  let NameSpace(container) = nameSpace
+  Belt.Map.String.set(container, id, value),
-  Belt.Map.String.set(container, id, value)->NameSpace
+)
-}
 
 let emptyModule: t = NameSpace(emptyMap)
 let emptyBindings = emptyModule
@@ -86,29 +79,28 @@ let fromExpressionValue = (aValue: internalExpressionValue): t =>
   | _ => emptyModule
   }
 
-let fromArray = a => Belt.Map.String.fromArray(a)->NameSpace
+let fromArray = a => NameSpace(Belt.Map.String.fromArray(a))
 
-let merge = (nameSpace: t, other: t): t => {
+let mergeFrom = (NameSpace(container): t, NameSpace(newContainer): t): t => {
-  let NameSpace(container) = nameSpace
+  NameSpace(
-  let NameSpace(otherContainer) = other
+    newContainer->Belt.Map.String.reduce(container, (container, key, value) =>
-  otherContainer
-  ->Belt.Map.String.reduce(container, (container, key, value) =>
       Belt.Map.String.set(container, key, value)
+    ),
   )
-  ->NameSpace
 }
 
-let removeOther = (nameSpace: t, other: t): t => {
+let removeOther = (NameSpace(container): t, NameSpace(otherContainer): t): t => {
-  let NameSpace(container) = nameSpace
-  let NameSpace(otherContainer) = other
   let keys = Belt.Map.String.keysToArray(otherContainer)
+  NameSpace(
     Belt.Map.String.keep(container, (key, _value) => {
       let removeThis = Js.Array2.includes(keys, key)
       !removeThis
-  })->NameSpace
+    }),
+  )
 }
 
 external castExpressionToInternalCode: ExpressionT.expressionOrFFI => internalCode = "%identity"
+
 let eLambdaFFIValue = (ffiFn: ExpressionT.ffiFn) => {
   IEvLambda({
     parameters: [],
@@ -153,9 +145,8 @@ let convertOptionToFfiFn = (
 }
 
 // -- Module definition
-let define = (nameSpace: t, identifier: string, ev: internalExpressionValue): t => {
+let define = (NameSpace(container): t, identifier: string, ev: internalExpressionValue): t => {
-  let NameSpace(container) = nameSpace
+  NameSpace(Belt.Map.String.set(container, identifier, ev))
-  Belt.Map.String.set(container, identifier, ev)->NameSpace
 }
 
 let defineNumber = (nameSpace: t, identifier: string, value: float): t =>
@@ -186,3 +177,9 @@ let defineFunctionReturningResult = (
 }
 
 let emptyStdLib: t = emptyModule->defineBool("_standardLibrary", true)
+
+let chainTo = (nameSpace: t, previousNameSpaces: array<t>) => {
+  previousNameSpaces->Belt.Array.reduce(nameSpace, (topNameSpace, prevNameSpace) =>
+    mergeFrom(prevNameSpace, topNameSpace)
+  )
+}

packages/squiggle-lang/src/rescript/ReducerInterface/ReducerInterface_Value/ReducerInterface_Value_Continuation.res

@@ -21,8 +21,7 @@ let inspectOption = (oNameSpace, label: string) =>
   }
 
 let minus = (NameSpace(thisContainer): t, NameSpace(thatContainer): t) => {
-  Belt.Map.String.removeMany(
+  InternalExpressionValue.NameSpace(
-    thisContainer,
+    Belt.Map.String.removeMany(thisContainer, Belt.Map.String.keysToArray(thatContainer)),
-    Belt.Map.String.keysToArray(thatContainer),
+  )
-  )->InternalExpressionValue.NameSpace
 }

packages/squiggle-lang/src/rescript/ReducerProject/ReducerProject.res

@@ -83,6 +83,21 @@ module Private = {
   let getIncludes = (project: t, sourceId: string): ProjectItem.T.includesType =>
     project->getItem(sourceId)->ProjectItem.getIncludes
 
+  // let getDirectIncludes = (project: t, sourceId: string): array<string> =>
+  //   project->getItem(sourceId)->ProjectItem.getDirectIncludes
+
+  let getPastChain = (project: t, sourceId: string): array<string> =>
+    project->getItem(sourceId)->ProjectItem.getPastChain
+
+  let getIncludesAsVariables = (
+    project: t,
+    sourceId: string,
+  ): ProjectItem.T.importAsVariablesType =>
+    project->getItem(sourceId)->ProjectItem.getIncludesAsVariables
+
+  let getDirectIncludes = (project: t, sourceId: string): array<string> =>
+    project->getItem(sourceId)->ProjectItem.getDirectIncludes
+
   let setContinues = (project: t, sourceId: string, continues: array<string>): unit => {
     let newItem = project->getItem(sourceId)->ProjectItem.setContinues(continues)
     Belt.Map.String.set(project["items"], sourceId, newItem)->T.Private.setFieldItems(project, _)
@@ -155,39 +170,63 @@ module Private = {
     environment: getEnvironment(project),
   }
 
-  let doRunWithContinuation = (
+  let getContinuationsBefore = (project: t, sourceId: string): array<
-    project: t,
+    ProjectItem.T.continuation,
-    sourceId: string,
+  > => {
-    continuation: ProjectItem.T.continuation,
+    let pastNameSpaces = project->getPastChain(sourceId)->Belt.Array.map(getBindings(project, _))
-  ): unit => {
+    let theLength = Belt.Array.length(pastNameSpaces)
+    if theLength == 0 {
+      // `getContinuationBefore ${sourceId}: stdLib`->Js.log
+      [project->getStdLib]
+    } else {
+      // `getContinuationBefore ${sourceId}: ${lastOne} = ${InternalExpressionValue.toStringBindings(
+      //     project->getBindings(lastOne),
+      //   )}`->Js.log
+      pastNameSpaces
+    }
+  }
+
+  let linkDependencies = (project: t, sourceId: string): ProjectItem.T.continuation => {
+    module NameSpace = Reducer_Bindings
+    let continuationsBefore = project->getContinuationsBefore(sourceId)
+    let nameSpace = NameSpace.emptyNameSpace->NameSpace.chainTo(continuationsBefore)
+    let includesAsVariables = project->getIncludesAsVariables(sourceId)
+    Belt.Array.reduce(includesAsVariables, nameSpace, (currentNameSpace, (variable, includeFile)) =>
+      Bindings.set(
+        currentNameSpace,
+        variable,
+        getBindings(project, includeFile)->InternalExpressionValue.IEvBindings,
+      )
+    )
+  }
+
+  let doLinkAndRun = (project: t, sourceId: string): unit => {
     let accessors = buildProjectAccessors(project)
     let states = accessors.states
+    let continuation = linkDependencies(project, sourceId)
     let newItem = project->getItem(sourceId)->ProjectItem.run(continuation, accessors)
     Belt.Map.String.set(project["items"], sourceId, newItem)->T.Private.setFieldItems(project, _)
     setContinuation(project, sourceId, states.continuation)
   }
 
-  type runState = (ProjectItem.T.resultArgumentType, ProjectItem.T.continuation)
+  type runState = ProjectItem.T.resultArgumentType
 
-  let tryRunWithContinuation = (
+  let tryRunWithResult = (
     project: t,
     sourceId: string,
-    (rPrevResult: ProjectItem.T.resultArgumentType, continuation: ProjectItem.T.continuation),
+    rPrevResult: ProjectItem.T.resultArgumentType,
-  ): (ProjectItem.T.resultArgumentType, ProjectItem.T.continuation) => {
+  ): ProjectItem.T.resultArgumentType => {
     switch getResultOption(project, sourceId) {
-    | Some(result) => (result, getContinuation(project, sourceId)) // already ran
+    | Some(result) => result // already ran
     | None =>
       switch rPrevResult {
       | Error(error) => {
           setResult(project, sourceId, Error(error))
-          (Error(error), continuation)
+          Error(error)
         }
       | Ok(_prevResult) => {
-          doRunWithContinuation(project, sourceId, continuation)
+          doLinkAndRun(project, sourceId)
-          (
+          getResultOption(project, sourceId)->Belt.Option.getWithDefault(rPrevResult)
-            getResultOption(project, sourceId)->Belt.Option.getWithDefault(rPrevResult),
-            getContinuation(project, sourceId),
-          )
         }
       }
     }
@@ -195,17 +234,17 @@ module Private = {
 
   let runAll = (project: t): unit => {
     let runOrder = Topology.getRunOrder(project)
-    let initialState = (Ok(InternalExpressionValue.IEvVoid), getStdLib(project))
+    let initialState = Ok(InternalExpressionValue.IEvVoid)
     let _finalState = Belt.Array.reduce(runOrder, initialState, (currState, currId) =>
-      tryRunWithContinuation(project, currId, currState)
+      tryRunWithResult(project, currId, currState)
     )
   }
 
   let run = (project: t, sourceId: string): unit => {
     let runOrder = Topology.getRunOrderFor(project, sourceId)
-    let initialState = (Ok(InternalExpressionValue.IEvVoid), getStdLib(project))
+    let initialState = Ok(InternalExpressionValue.IEvVoid)
     let _finalState = Belt.Array.reduce(runOrder, initialState, (currState, currId) =>
-      tryRunWithContinuation(project, currId, currState)
+      tryRunWithResult(project, currId, currState)
     )
   }
 

packages/squiggle-lang/src/rescript/ReducerProject/ReducerProject_IncludeParser.js

@@ -173,12 +173,14 @@ function peg$parse(input, options) {
   var peg$startRuleFunctions = { start: peg$parsestart };
   var peg$startRuleFunction = peg$parsestart;
 
-  var peg$c0 = "#include";
+  var peg$c0 = "#";
-  var peg$c1 = "'";
+  var peg$c1 = "#include";
-  var peg$c2 = "\"";
+  var peg$c2 = "as";
-  var peg$c3 = "//";
+  var peg$c3 = "'";
-  var peg$c4 = "/*";
+  var peg$c4 = "\"";
-  var peg$c5 = "*/";
+  var peg$c5 = "//";
+  var peg$c6 = "/*";
+  var peg$c7 = "*/";
 
   var peg$r0 = /^[^']/;
   var peg$r1 = /^[^"]/;
@@ -186,29 +188,40 @@ function peg$parse(input, options) {
   var peg$r3 = /^[ \t]/;
   var peg$r4 = /^[\n\r]/;
   var peg$r5 = /^[^\r\n]/;
+  var peg$r6 = /^[_a-z]/;
+  var peg$r7 = /^[_a-z0-9]/i;
 
-  var peg$e0 = peg$literalExpectation("#include", false);
+  var peg$e0 = peg$literalExpectation("#", false);
-  var peg$e1 = peg$otherExpectation("string");
+  var peg$e1 = peg$literalExpectation("#include", false);
-  var peg$e2 = peg$literalExpectation("'", false);
+  var peg$e2 = peg$literalExpectation("as", false);
-  var peg$e3 = peg$classExpectation(["'"], true, false);
+  var peg$e3 = peg$otherExpectation("string");
-  var peg$e4 = peg$literalExpectation("\"", false);
+  var peg$e4 = peg$literalExpectation("'", false);
-  var peg$e5 = peg$classExpectation(["\""], true, false);
+  var peg$e5 = peg$classExpectation(["'"], true, false);
-  var peg$e6 = peg$literalExpectation("//", false);
+  var peg$e6 = peg$literalExpectation("\"", false);
-  var peg$e7 = peg$literalExpectation("/*", false);
+  var peg$e7 = peg$classExpectation(["\""], true, false);
-  var peg$e8 = peg$classExpectation(["*"], true, false);
+  var peg$e8 = peg$otherExpectation("comment");
-  var peg$e9 = peg$literalExpectation("*/", false);
+  var peg$e9 = peg$literalExpectation("//", false);
-  var peg$e10 = peg$otherExpectation("white space");
+  var peg$e10 = peg$literalExpectation("/*", false);
-  var peg$e11 = peg$classExpectation([" ", "\t"], false, false);
+  var peg$e11 = peg$classExpectation(["*"], true, false);
-  var peg$e12 = peg$otherExpectation("newline");
+  var peg$e12 = peg$literalExpectation("*/", false);
-  var peg$e13 = peg$classExpectation(["\n", "\r"], false, false);
+  var peg$e13 = peg$otherExpectation("white space");
-  var peg$e14 = peg$classExpectation(["\r", "\n"], true, false);
+  var peg$e14 = peg$classExpectation([" ", "\t"], false, false);
+  var peg$e15 = peg$otherExpectation("newline");
+  var peg$e16 = peg$classExpectation(["\n", "\r"], false, false);
+  var peg$e17 = peg$otherExpectation("code");
+  var peg$e18 = peg$classExpectation(["\r", "\n"], true, false);
+  var peg$e19 = peg$otherExpectation("identifier");
+  var peg$e20 = peg$classExpectation(["_", ["a", "z"]], false, false);
+  var peg$e21 = peg$classExpectation(["_", ["a", "z"], ["0", "9"]], false, true);
 
   var peg$f0 = function(head, tail) {return [head, ...tail].filter( e => e != '');};
   var peg$f1 = function() {return [];};
-  var peg$f2 = function(characters) {return characters.join('');};
+  var peg$f2 = function(file, variable) {return [!variable ? '' : variable, file]};
   var peg$f3 = function(characters) {return characters.join('');};
-  var peg$f4 = function() { return '';};
+  var peg$f4 = function(characters) {return characters.join('');};
   var peg$f5 = function() { return '';};
+  var peg$f6 = function() { return '';};
+  var peg$f7 = function() {return text();};
   var peg$currPos = 0;
   var peg$savedPos = 0;
   var peg$posDetailsCache = [{ line: 1, column: 1 }];
@@ -369,7 +382,7 @@ function peg$parse(input, options) {
   function peg$parsestart() {
     var s0, s1, s2, s3, s4;
 
-    var key = peg$currPos * 10 + 0;
+    var key = peg$currPos * 12 + 0;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -426,7 +439,7 @@ function peg$parse(input, options) {
   function peg$parseincludes() {
     var s0, s1, s2, s3, s4, s5;
 
-    var key = peg$currPos * 10 + 1;
+    var key = peg$currPos * 12 + 1;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -436,7 +449,7 @@ function peg$parse(input, options) {
     }
 
     s0 = peg$currPos;
-    s1 = peg$parseincludeStatement();
+    s1 = peg$parsedependencyStatement();
     if (s1 !== peg$FAILED) {
       s2 = [];
       s3 = peg$currPos;
@@ -451,7 +464,7 @@ function peg$parse(input, options) {
         s4 = peg$FAILED;
       }
       if (s4 !== peg$FAILED) {
-        s5 = peg$parseincludeStatement();
+        s5 = peg$parsedependencyStatement();
         if (s5 !== peg$FAILED) {
           s3 = s5;
         } else {
@@ -476,7 +489,7 @@ function peg$parse(input, options) {
           s4 = peg$FAILED;
         }
         if (s4 !== peg$FAILED) {
-          s5 = peg$parseincludeStatement();
+          s5 = peg$parsedependencyStatement();
           if (s5 !== peg$FAILED) {
             s3 = s5;
           } else {
@@ -496,9 +509,26 @@ function peg$parse(input, options) {
     }
     if (s0 === peg$FAILED) {
       s0 = peg$currPos;
-      s1 = peg$parseignore();
+      s1 = peg$currPos;
+      peg$silentFails++;
+      if (input.charCodeAt(peg$currPos) === 35) {
+        s2 = peg$c0;
+        peg$currPos++;
+      } else {
+        s2 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$e0); }
+      }
+      peg$silentFails--;
+      if (s2 === peg$FAILED) {
+        s1 = undefined;
+      } else {
+        peg$currPos = s1;
+        s1 = peg$FAILED;
+      }
+      if (s1 !== peg$FAILED) {
         peg$savedPos = s0;
         s1 = peg$f1();
+      }
       s0 = s1;
     }
 
@@ -507,10 +537,35 @@ function peg$parse(input, options) {
     return s0;
   }
 
-  function peg$parseincludeStatement() {
+  function peg$parsedependencyStatement() {
-    var s0, s1, s2, s3, s4, s5, s6;
+    var s0;
 
-    var key = peg$currPos * 10 + 2;
+    var key = peg$currPos * 12 + 2;
+    var cached = peg$resultsCache[key];
+
+    if (cached) {
+      peg$currPos = cached.nextPos;
+
+      return cached.result;
+    }
+
+    s0 = peg$parseincludeStatement();
+    if (s0 === peg$FAILED) {
+      s0 = peg$parsecomment();
+      if (s0 === peg$FAILED) {
+        s0 = peg$parsedelimitedComment();
+      }
+    }
+
+    peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };
+
+    return s0;
+  }
+
+  function peg$parseincludeStatement() {
+    var s0, s1, s2, s3, s4, s5, s6, s7, s8, s9;
+
+    var key = peg$currPos * 12 + 3;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -526,29 +581,99 @@ function peg$parse(input, options) {
       s1.push(s2);
       s2 = peg$parse_();
     }
-    if (input.substr(peg$currPos, 8) === peg$c0) {
+    if (input.substr(peg$currPos, 8) === peg$c1) {
-      s2 = peg$c0;
+      s2 = peg$c1;
       peg$currPos += 8;
     } else {
       s2 = peg$FAILED;
-      if (peg$silentFails === 0) { peg$fail(peg$e0); }
+      if (peg$silentFails === 0) { peg$fail(peg$e1); }
     }
     if (s2 !== peg$FAILED) {
       s3 = [];
       s4 = peg$parse_();
+      if (s4 !== peg$FAILED) {
         while (s4 !== peg$FAILED) {
           s3.push(s4);
           s4 = peg$parse_();
         }
+      } else {
+        s3 = peg$FAILED;
+      }
+      if (s3 !== peg$FAILED) {
         s4 = peg$parsestring();
         if (s4 !== peg$FAILED) {
-        s5 = [];
+          s5 = peg$currPos;
-        s6 = peg$parse_();
+          s6 = [];
-        while (s6 !== peg$FAILED) {
+          s7 = peg$parse_();
-          s5.push(s6);
+          if (s7 !== peg$FAILED) {
-          s6 = peg$parse_();
+            while (s7 !== peg$FAILED) {
+              s6.push(s7);
+              s7 = peg$parse_();
             }
-        s0 = s4;
+          } else {
+            s6 = peg$FAILED;
+          }
+          if (s6 !== peg$FAILED) {
+            if (input.substr(peg$currPos, 2) === peg$c2) {
+              s7 = peg$c2;
+              peg$currPos += 2;
+            } else {
+              s7 = peg$FAILED;
+              if (peg$silentFails === 0) { peg$fail(peg$e2); }
+            }
+            if (s7 !== peg$FAILED) {
+              s8 = [];
+              s9 = peg$parse_();
+              if (s9 !== peg$FAILED) {
+                while (s9 !== peg$FAILED) {
+                  s8.push(s9);
+                  s9 = peg$parse_();
+                }
+              } else {
+                s8 = peg$FAILED;
+              }
+              if (s8 !== peg$FAILED) {
+                s9 = peg$parseidentifier();
+                if (s9 !== peg$FAILED) {
+                  s5 = s9;
+                } else {
+                  peg$currPos = s5;
+                  s5 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s5;
+                s5 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s5;
+              s5 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s5;
+            s5 = peg$FAILED;
+          }
+          if (s5 === peg$FAILED) {
+            s5 = null;
+          }
+          s6 = [];
+          s7 = peg$parse_();
+          while (s7 !== peg$FAILED) {
+            s6.push(s7);
+            s7 = peg$parse_();
+          }
+          s7 = peg$currPos;
+          peg$silentFails++;
+          s8 = peg$parsenewLine();
+          peg$silentFails--;
+          if (s8 !== peg$FAILED) {
+            peg$currPos = s7;
+            s7 = undefined;
+          } else {
+            s7 = peg$FAILED;
+          }
+          if (s7 !== peg$FAILED) {
+            peg$savedPos = s0;
+            s0 = peg$f2(s4, s5);
           } else {
             peg$currPos = s0;
             s0 = peg$FAILED;
@@ -557,11 +682,13 @@ function peg$parse(input, options) {
           peg$currPos = s0;
           s0 = peg$FAILED;
         }
-    if (s0 === peg$FAILED) {
+      } else {
-      s0 = peg$parsecomment();
+        peg$currPos = s0;
-      if (s0 === peg$FAILED) {
+        s0 = peg$FAILED;
-        s0 = peg$parsedelimitedComment();
       }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
     }
 
     peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };
@@ -572,7 +699,7 @@ function peg$parse(input, options) {
   function peg$parsestring() {
     var s0, s1, s2, s3, s4;
 
-    var key = peg$currPos * 10 + 3;
+    var key = peg$currPos * 12 + 4;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -585,58 +712,7 @@ function peg$parse(input, options) {
     s0 = peg$currPos;
     s1 = peg$currPos;
     if (input.charCodeAt(peg$currPos) === 39) {
-      s2 = peg$c1;
+      s2 = peg$c3;
-      peg$currPos++;
-    } else {
-      s2 = peg$FAILED;
-      if (peg$silentFails === 0) { peg$fail(peg$e2); }
-    }
-    if (s2 !== peg$FAILED) {
-      s3 = [];
-      if (peg$r0.test(input.charAt(peg$currPos))) {
-        s4 = input.charAt(peg$currPos);
-        peg$currPos++;
-      } else {
-        s4 = peg$FAILED;
-        if (peg$silentFails === 0) { peg$fail(peg$e3); }
-      }
-      while (s4 !== peg$FAILED) {
-        s3.push(s4);
-        if (peg$r0.test(input.charAt(peg$currPos))) {
-          s4 = input.charAt(peg$currPos);
-          peg$currPos++;
-        } else {
-          s4 = peg$FAILED;
-          if (peg$silentFails === 0) { peg$fail(peg$e3); }
-        }
-      }
-      if (input.charCodeAt(peg$currPos) === 39) {
-        s4 = peg$c1;
-        peg$currPos++;
-      } else {
-        s4 = peg$FAILED;
-        if (peg$silentFails === 0) { peg$fail(peg$e2); }
-      }
-      if (s4 !== peg$FAILED) {
-        s1 = s3;
-      } else {
-        peg$currPos = s1;
-        s1 = peg$FAILED;
-      }
-    } else {
-      peg$currPos = s1;
-      s1 = peg$FAILED;
-    }
-    if (s1 !== peg$FAILED) {
-      peg$savedPos = s0;
-      s1 = peg$f2(s1);
-    }
-    s0 = s1;
-    if (s0 === peg$FAILED) {
-      s0 = peg$currPos;
-      s1 = peg$currPos;
-      if (input.charCodeAt(peg$currPos) === 34) {
-        s2 = peg$c2;
       peg$currPos++;
     } else {
       s2 = peg$FAILED;
@@ -644,7 +720,7 @@ function peg$parse(input, options) {
     }
     if (s2 !== peg$FAILED) {
       s3 = [];
-        if (peg$r1.test(input.charAt(peg$currPos))) {
+      if (peg$r0.test(input.charAt(peg$currPos))) {
         s4 = input.charAt(peg$currPos);
         peg$currPos++;
       } else {
@@ -653,7 +729,7 @@ function peg$parse(input, options) {
       }
       while (s4 !== peg$FAILED) {
         s3.push(s4);
-          if (peg$r1.test(input.charAt(peg$currPos))) {
+        if (peg$r0.test(input.charAt(peg$currPos))) {
           s4 = input.charAt(peg$currPos);
           peg$currPos++;
         } else {
@@ -661,8 +737,8 @@ function peg$parse(input, options) {
           if (peg$silentFails === 0) { peg$fail(peg$e5); }
         }
       }
-        if (input.charCodeAt(peg$currPos) === 34) {
+      if (input.charCodeAt(peg$currPos) === 39) {
-          s4 = peg$c2;
+        s4 = peg$c3;
         peg$currPos++;
       } else {
         s4 = peg$FAILED;
@@ -683,11 +759,62 @@ function peg$parse(input, options) {
       s1 = peg$f3(s1);
     }
     s0 = s1;
+    if (s0 === peg$FAILED) {
+      s0 = peg$currPos;
+      s1 = peg$currPos;
+      if (input.charCodeAt(peg$currPos) === 34) {
+        s2 = peg$c4;
+        peg$currPos++;
+      } else {
+        s2 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$e6); }
+      }
+      if (s2 !== peg$FAILED) {
+        s3 = [];
+        if (peg$r1.test(input.charAt(peg$currPos))) {
+          s4 = input.charAt(peg$currPos);
+          peg$currPos++;
+        } else {
+          s4 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$e7); }
+        }
+        while (s4 !== peg$FAILED) {
+          s3.push(s4);
+          if (peg$r1.test(input.charAt(peg$currPos))) {
+            s4 = input.charAt(peg$currPos);
+            peg$currPos++;
+          } else {
+            s4 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$e7); }
+          }
+        }
+        if (input.charCodeAt(peg$currPos) === 34) {
+          s4 = peg$c4;
+          peg$currPos++;
+        } else {
+          s4 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$e6); }
+        }
+        if (s4 !== peg$FAILED) {
+          s1 = s3;
+        } else {
+          peg$currPos = s1;
+          s1 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s1;
+        s1 = peg$FAILED;
+      }
+      if (s1 !== peg$FAILED) {
+        peg$savedPos = s0;
+        s1 = peg$f4(s1);
+      }
+      s0 = s1;
     }
     peg$silentFails--;
     if (s0 === peg$FAILED) {
       s1 = peg$FAILED;
-      if (peg$silentFails === 0) { peg$fail(peg$e1); }
+      if (peg$silentFails === 0) { peg$fail(peg$e3); }
     }
 
     peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };
@@ -698,7 +825,7 @@ function peg$parse(input, options) {
   function peg$parseignore() {
     var s0, s1;
 
-    var key = peg$currPos * 10 + 4;
+    var key = peg$currPos * 12 + 5;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -732,9 +859,9 @@ function peg$parse(input, options) {
   }
 
   function peg$parsecomment() {
-    var s0, s1, s2, s3;
+    var s0, s1, s2, s3, s4;
 
-    var key = peg$currPos * 10 + 5;
+    var key = peg$currPos * 12 + 6;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -743,79 +870,32 @@ function peg$parse(input, options) {
       return cached.result;
     }
 
+    peg$silentFails++;
     s0 = peg$currPos;
-    if (input.substr(peg$currPos, 2) === peg$c3) {
-      s1 = peg$c3;
-      peg$currPos += 2;
-    } else {
-      s1 = peg$FAILED;
-      if (peg$silentFails === 0) { peg$fail(peg$e6); }
-    }
-    if (s1 !== peg$FAILED) {
-      s2 = [];
-      s3 = peg$parseany();
-      while (s3 !== peg$FAILED) {
-        s2.push(s3);
-        s3 = peg$parseany();
-      }
-      peg$savedPos = s0;
-      s0 = peg$f4();
-    } else {
-      peg$currPos = s0;
-      s0 = peg$FAILED;
-    }
-
-    peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };
-
-    return s0;
-  }
-
-  function peg$parsedelimitedComment() {
-    var s0, s1, s2, s3;
-
-    var key = peg$currPos * 10 + 6;
-    var cached = peg$resultsCache[key];
-
-    if (cached) {
-      peg$currPos = cached.nextPos;
-
-      return cached.result;
-    }
-
-    s0 = peg$currPos;
-    if (input.substr(peg$currPos, 2) === peg$c4) {
-      s1 = peg$c4;
-      peg$currPos += 2;
-    } else {
-      s1 = peg$FAILED;
-      if (peg$silentFails === 0) { peg$fail(peg$e7); }
-    }
-    if (s1 !== peg$FAILED) {
-      s2 = [];
-      if (peg$r2.test(input.charAt(peg$currPos))) {
-        s3 = input.charAt(peg$currPos);
-        peg$currPos++;
-      } else {
-        s3 = peg$FAILED;
-        if (peg$silentFails === 0) { peg$fail(peg$e8); }
-      }
-      while (s3 !== peg$FAILED) {
-        s2.push(s3);
-        if (peg$r2.test(input.charAt(peg$currPos))) {
-          s3 = input.charAt(peg$currPos);
-          peg$currPos++;
-        } else {
-          s3 = peg$FAILED;
-          if (peg$silentFails === 0) { peg$fail(peg$e8); }
-        }
-      }
     if (input.substr(peg$currPos, 2) === peg$c5) {
-        s3 = peg$c5;
+      s1 = peg$c5;
       peg$currPos += 2;
     } else {
-        s3 = peg$FAILED;
+      s1 = peg$FAILED;
       if (peg$silentFails === 0) { peg$fail(peg$e9); }
     }
+    if (s1 !== peg$FAILED) {
+      s2 = [];
+      s3 = peg$parseany();
+      while (s3 !== peg$FAILED) {
+        s2.push(s3);
+        s3 = peg$parseany();
+      }
+      s3 = peg$currPos;
+      peg$silentFails++;
+      s4 = peg$parsenewLine();
+      peg$silentFails--;
+      if (s4 !== peg$FAILED) {
+        peg$currPos = s3;
+        s3 = undefined;
+      } else {
+        s3 = peg$FAILED;
+      }
       if (s3 !== peg$FAILED) {
         peg$savedPos = s0;
         s0 = peg$f5();
@@ -827,6 +907,80 @@ function peg$parse(input, options) {
       peg$currPos = s0;
       s0 = peg$FAILED;
     }
+    peg$silentFails--;
+    if (s0 === peg$FAILED) {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e8); }
+    }
+
+    peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };
+
+    return s0;
+  }
+
+  function peg$parsedelimitedComment() {
+    var s0, s1, s2, s3;
+
+    var key = peg$currPos * 12 + 7;
+    var cached = peg$resultsCache[key];
+
+    if (cached) {
+      peg$currPos = cached.nextPos;
+
+      return cached.result;
+    }
+
+    peg$silentFails++;
+    s0 = peg$currPos;
+    if (input.substr(peg$currPos, 2) === peg$c6) {
+      s1 = peg$c6;
+      peg$currPos += 2;
+    } else {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e10); }
+    }
+    if (s1 !== peg$FAILED) {
+      s2 = [];
+      if (peg$r2.test(input.charAt(peg$currPos))) {
+        s3 = input.charAt(peg$currPos);
+        peg$currPos++;
+      } else {
+        s3 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$e11); }
+      }
+      while (s3 !== peg$FAILED) {
+        s2.push(s3);
+        if (peg$r2.test(input.charAt(peg$currPos))) {
+          s3 = input.charAt(peg$currPos);
+          peg$currPos++;
+        } else {
+          s3 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$e11); }
+        }
+      }
+      if (input.substr(peg$currPos, 2) === peg$c7) {
+        s3 = peg$c7;
+        peg$currPos += 2;
+      } else {
+        s3 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$e12); }
+      }
+      if (s3 !== peg$FAILED) {
+        peg$savedPos = s0;
+        s0 = peg$f6();
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+    peg$silentFails--;
+    if (s0 === peg$FAILED) {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e8); }
+    }
 
     peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };
 
@@ -836,7 +990,7 @@ function peg$parse(input, options) {
   function peg$parse_() {
     var s0, s1;
 
-    var key = peg$currPos * 10 + 7;
+    var key = peg$currPos * 12 + 8;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -851,12 +1005,12 @@ function peg$parse(input, options) {
       peg$currPos++;
     } else {
       s0 = peg$FAILED;
-      if (peg$silentFails === 0) { peg$fail(peg$e11); }
+      if (peg$silentFails === 0) { peg$fail(peg$e14); }
     }
     peg$silentFails--;
     if (s0 === peg$FAILED) {
       s1 = peg$FAILED;
-      if (peg$silentFails === 0) { peg$fail(peg$e10); }
+      if (peg$silentFails === 0) { peg$fail(peg$e13); }
     }
 
     peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };
@@ -867,7 +1021,7 @@ function peg$parse(input, options) {
   function peg$parsenewLine() {
     var s0, s1;
 
-    var key = peg$currPos * 10 + 8;
+    var key = peg$currPos * 12 + 9;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -882,12 +1036,12 @@ function peg$parse(input, options) {
       peg$currPos++;
     } else {
       s0 = peg$FAILED;
-      if (peg$silentFails === 0) { peg$fail(peg$e13); }
+      if (peg$silentFails === 0) { peg$fail(peg$e16); }
     }
     peg$silentFails--;
     if (s0 === peg$FAILED) {
       s1 = peg$FAILED;
-      if (peg$silentFails === 0) { peg$fail(peg$e12); }
+      if (peg$silentFails === 0) { peg$fail(peg$e15); }
     }
 
     peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };
@@ -896,9 +1050,9 @@ function peg$parse(input, options) {
   }
 
   function peg$parseany() {
-    var s0;
+    var s0, s1;
 
-    var key = peg$currPos * 10 + 9;
+    var key = peg$currPos * 12 + 10;
     var cached = peg$resultsCache[key];
 
     if (cached) {
@@ -907,12 +1061,96 @@ function peg$parse(input, options) {
       return cached.result;
     }
 
+    peg$silentFails++;
     if (peg$r5.test(input.charAt(peg$currPos))) {
       s0 = input.charAt(peg$currPos);
       peg$currPos++;
     } else {
       s0 = peg$FAILED;
-      if (peg$silentFails === 0) { peg$fail(peg$e14); }
+      if (peg$silentFails === 0) { peg$fail(peg$e18); }
+    }
+    peg$silentFails--;
+    if (s0 === peg$FAILED) {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e17); }
+    }
+
+    peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };
+
+    return s0;
+  }
+
+  function peg$parseidentifier() {
+    var s0, s1, s2, s3, s4;
+
+    var key = peg$currPos * 12 + 11;
+    var cached = peg$resultsCache[key];
+
+    if (cached) {
+      peg$currPos = cached.nextPos;
+
+      return cached.result;
+    }
+
+    peg$silentFails++;
+    s0 = peg$currPos;
+    s1 = peg$currPos;
+    s2 = [];
+    if (peg$r6.test(input.charAt(peg$currPos))) {
+      s3 = input.charAt(peg$currPos);
+      peg$currPos++;
+    } else {
+      s3 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e20); }
+    }
+    if (s3 !== peg$FAILED) {
+      while (s3 !== peg$FAILED) {
+        s2.push(s3);
+        if (peg$r6.test(input.charAt(peg$currPos))) {
+          s3 = input.charAt(peg$currPos);
+          peg$currPos++;
+        } else {
+          s3 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$e20); }
+        }
+      }
+    } else {
+      s2 = peg$FAILED;
+    }
+    if (s2 !== peg$FAILED) {
+      s3 = [];
+      if (peg$r7.test(input.charAt(peg$currPos))) {
+        s4 = input.charAt(peg$currPos);
+        peg$currPos++;
+      } else {
+        s4 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$e21); }
+      }
+      while (s4 !== peg$FAILED) {
+        s3.push(s4);
+        if (peg$r7.test(input.charAt(peg$currPos))) {
+          s4 = input.charAt(peg$currPos);
+          peg$currPos++;
+        } else {
+          s4 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$e21); }
+        }
+      }
+      s2 = [s2, s3];
+      s1 = s2;
+    } else {
+      peg$currPos = s1;
+      s1 = peg$FAILED;
+    }
+    if (s1 !== peg$FAILED) {
+      peg$savedPos = s0;
+      s1 = peg$f7();
+    }
+    s0 = s1;
+    peg$silentFails--;
+    if (s0 === peg$FAILED) {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e19); }
     }
 
     peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };

packages/squiggle-lang/src/rescript/ReducerProject/ReducerProject_IncludeParser.peggy

@@ -1,33 +1,37 @@
 // Includes are at the start of the file, before any other code. 
 // There might be some comments before or between the includes.
 // #include "string"
-// #include "string2"
+// #include "string2" as aVariable
 
 start
   = (newLine/_/comment/delimitedComment)* @includes newLine* ignore
 
 includes
- = head:includeStatement tail:(newLine+ @includeStatement)* 
+ = head:dependencyStatement tail:(newLine+ @dependencyStatement)* 
  {return [head, ...tail].filter( e => e != '');}
- / ignore 
+ / ! '#'
  {return [];}
 
-includeStatement
+dependencyStatement
-  = _* '#include' _* @string _* 
+  = includeStatement
   / comment
   / delimitedComment
 
+includeStatement
+  = _* '#include' _+ file:string variable:(_+ 'as' _+ @identifier)? _* & newLine
+  {return [!variable ? '' : variable, file]}
+
 string 'string'
   = characters:("'" @([^'])* "'") {return characters.join('');} 
   / characters:('"' @([^"])* '"') {return characters.join('');}
 
 ignore = (any / newLine / _)*
 
-comment
+comment 'comment'
-= '//'any*
+= '//'any* & newLine
 { return '';}
 
-delimitedComment  
+delimitedComment 'comment' 
 = '/*' ([^*]*) '*/'
 { return '';}
 
@@ -37,4 +41,8 @@ _ "white space"
 newLine "newline"
   = [\n\r]
   
-any = [^\r\n]
+any 'code'
+ = [^\r\n]
+
+identifier 'identifier'
+  = ([_a-z]+[_a-z0-9]i*) {return text();} 

packages/squiggle-lang/src/rescript/ReducerProject/ReducerProject_ParseIncludes.res

@@ -1,11 +1,15 @@
-@module("./ReducerProject_IncludeParser.js") external parse__: string => array<string> = "parse"
+@module("./ReducerProject_IncludeParser.js")
+external parse__: string => array<array<string>> = "parse"
 
-let parseIncludes = (expr: string): result<array<string>, Reducer_ErrorValue.errorValue> =>
+let parseIncludes = (expr: string): result<
+  array<(string, string)>,
+  Reducer_ErrorValue.errorValue,
+> =>
   try {
     let answer = parse__(expr)
     // let logEntry = answer->Js.Array2.joinWith(",")
     // `parseIncludes: ${logEntry} for expr: ${expr}`->Js.log
-    answer->Ok
+    Belt.Array.map(answer, item => (item[0], item[1]))->Ok
   } catch {
   | Js.Exn.Error(obj) =>
     RESyntaxError(

packages/squiggle-lang/src/rescript/ReducerProject/ReducerProject_ProjectItem.res

@@ -19,6 +19,8 @@ let emptyItem = T.ProjectItem({
   result: None,
   continues: [],
   includes: []->Ok,
+  directIncludes: [],
+  includeAsVariables: [],
 })
 // source -> rawParse -> includes -> expression -> continuation -> result
 
@@ -30,40 +32,59 @@ let getResult = (T.ProjectItem(r)): T.resultType => r.result
 
 let getContinues = (T.ProjectItem(r)): T.continuesType => r.continues
 let getIncludes = (T.ProjectItem(r)): T.includesType => r.includes
+let getDirectIncludes = (T.ProjectItem(r)): array<string> => r.directIncludes
+let getIncludesAsVariables = (T.ProjectItem(r)): T.importAsVariablesType => r.includeAsVariables
 
 let touchSource = (this: t): t => {
   let T.ProjectItem(r) = emptyItem
   T.ProjectItem({
     ...r,
-    includes: getIncludes(this),
-    continues: getContinues(this),
     source: getSource(this),
+    continues: getContinues(this),
+    includes: getIncludes(this),
+    includeAsVariables: getIncludesAsVariables(this),
+    directIncludes: getDirectIncludes(this),
   })
 }
+
 let touchRawParse = (this: t): t => {
   let T.ProjectItem(r) = emptyItem
   T.ProjectItem({
     ...r,
-    continues: getContinues(this),
     source: getSource(this),
-    rawParse: getRawParse(this),
+    continues: getContinues(this),
     includes: getIncludes(this),
+    includeAsVariables: getIncludesAsVariables(this),
+    directIncludes: getDirectIncludes(this),
+    rawParse: getRawParse(this),
   })
 }
+
 let touchExpression = (this: t): t => {
   let T.ProjectItem(r) = emptyItem
   T.ProjectItem({
     ...r,
-    continues: getContinues(this),
     source: getSource(this),
-    rawParse: getRawParse(this),
+    continues: getContinues(this),
     includes: getIncludes(this),
+    includeAsVariables: getIncludesAsVariables(this),
+    directIncludes: getDirectIncludes(this),
+    rawParse: getRawParse(this),
     expression: getExpression(this),
   })
 }
 
+let resetIncludes = (T.ProjectItem(r): t): t => {
+  T.ProjectItem({
+    ...r,
+    includes: []->Ok,
+    includeAsVariables: [],
+    directIncludes: [],
+  })
+}
+
 let setSource = (T.ProjectItem(r): t, source: T.sourceArgumentType): t =>
-  T.ProjectItem({...r, source: source})->touchSource
+  T.ProjectItem({...r, source: source})->resetIncludes->touchSource
 
 let setRawParse = (T.ProjectItem(r): t, rawParse: T.rawParseArgumentType): t =>
   T.ProjectItem({...r, rawParse: Some(rawParse)})->touchRawParse
@@ -95,6 +116,10 @@ let clean = (this: t): t => {
 let getImmediateDependencies = (this: t): T.includesType =>
   getIncludes(this)->Belt.Result.map(Js.Array2.concat(_, getContinues(this)))
 
+let getPastChain = (this: t): array<string> => {
+  Js.Array2.concat(getDirectIncludes(this), getContinues(this))
+}
+
 let setContinues = (T.ProjectItem(r): t, continues: array<string>): t =>
   T.ProjectItem({...r, continues: continues})->touchSource
 let removeContinues = (T.ProjectItem(r): t): t => T.ProjectItem({...r, continues: []})->touchSource
@@ -104,10 +129,38 @@ let setIncludes = (T.ProjectItem(r): t, includes: T.includesType): t => T.Projec
   includes: includes,
 })
 
-//TODO: forward parse errors to the user
+let setImportAsVariables = (
-let parseIncludes = (this: t): t =>
+  T.ProjectItem(r): t,
-  setIncludes(this, getSource(this)->ReducerProject_ParseIncludes.parseIncludes)
+  includeAsVariables: T.importAsVariablesType,
+): t => T.ProjectItem({...r, includeAsVariables: includeAsVariables})
 
+let setDirectImports = (T.ProjectItem(r): t, directIncludes: array<string>): t => T.ProjectItem({
+  ...r,
+  directIncludes: directIncludes,
+})
+
+let parseIncludes = (this: t): t => {
+  let T.ProjectItem(r) = this
+  let rRawImportAsVariables = getSource(this)->ReducerProject_ParseIncludes.parseIncludes
+  switch rRawImportAsVariables {
+  | Error(e) => resetIncludes(this)->setIncludes(Error(e))
+  | Ok(rawImportAsVariables) => {
+      let includes = rawImportAsVariables->Belt.Array.map(((_variable, file)) => file)->Ok
+      let includeAsVariables =
+        rawImportAsVariables->Belt.Array.keep(((variable, _file)) => variable != "")
+      let directIncludes =
+        rawImportAsVariables
+        ->Belt.Array.keep(((variable, _file)) => variable == "")
+        ->Belt.Array.map(((_variable, file)) => file)
+      T.ProjectItem({
+        ...r,
+        includes: includes,
+        includeAsVariables: includeAsVariables,
+        directIncludes: directIncludes,
+      })
+    }
+  }
+}
 let doRawParse = (this: t): T.rawParseArgumentType => this->getSource->Reducer_Peggy_Parse.parse
 
 let rawParse = (this: t): t =>

packages/squiggle-lang/src/rescript/ReducerProject/ReducerProject_ProjectItem_T.res

@@ -21,6 +21,7 @@ type continuesArgumentType = array<string>
 type continuesType = array<string>
 type includesArgumentType = string
 type includesType = result<array<string>, errorValue>
+type importAsVariablesType = array<(string, string)>
 
 type projectItem =
   | ProjectItem({
@@ -30,7 +31,9 @@ type projectItem =
       continuation: continuationArgumentType,
       result: resultType,
       continues: continuesType,
-      includes: includesType,
+      includes: includesType, //For  loader
-    })
+      includeAsVariables: importAsVariablesType, //For linker
+      directIncludes: array<string>,
+    }) //For linker
 
 type t = projectItem

packages/squiggle-lang/src/rescript/SquiggleLibrary/SquiggleLibrary_Math.res

@@ -19,4 +19,4 @@ let mathBindings: Bindings.t =
   ->Bindings.fromArray
 
 let makeBindings = (previousBindings: Bindings.t): Bindings.t =>
-  previousBindings->Bindings.merge(mathBindings)
+  previousBindings->Bindings.mergeFrom(mathBindings)

packages/squiggle-lang/src/rescript/SquiggleLibrary/SquiggleLibrary_Versions.res

@@ -6,4 +6,4 @@ let bindings: Bindings.t =
   ]->Bindings.fromArray
 
 let makeBindings = (previousBindings: Bindings.t): Bindings.t =>
-  previousBindings->Bindings.merge(bindings)
+  previousBindings->Bindings.mergeFrom(bindings)