Merge pull request #4229 from ethereum/remaps

consider remappings while compilation

libs/remix-solidity/src/compiler/compiler-input.ts

@@ -17,7 +17,8 @@ export default (sources: Source, opts: CompilerInputOptions): string => {
           '': ['ast'],
           '*': ['abi', 'metadata', 'devdoc', 'userdoc', 'storageLayout', 'evm.legacyAssembly', 'evm.bytecode', 'evm.deployedBytecode', 'evm.methodIdentifiers', 'evm.gasEstimates', 'evm.assembly']
         }
-      }
+      },
+      remappings: opts.remappings || []
     }
   }  
   if (opts.evmVersion) {

libs/remix-solidity/src/compiler/compiler.ts

@@ -32,6 +32,7 @@ export class Compiler {
       runs: 200,
       evmVersion: null,
       language: 'Solidity',
+      remappings: [],
       compilationStartTime: null,
       target: null,
       useFileConfiguration: false,
@@ -213,12 +214,11 @@ export class Compiler {
           let input = ""
           try {
             if (source && source.sources) {
-              const { optimize, runs, evmVersion, language, useFileConfiguration, configFileContent } = this.state
-
+              const { optimize, runs, evmVersion, language, remappings, useFileConfiguration, configFileContent } = this.state
               if (useFileConfiguration) {
                 input = compilerInputForConfigFile(source.sources, JSON.parse(configFileContent))
               } else {
-                input = compilerInput(source.sources, { optimize, runs, evmVersion, language })
+                input = compilerInput(source.sources, { optimize, runs, evmVersion, language, remappings })
               }
 
               result = JSON.parse(remoteCompiler.compile(input, { import: missingInputsCallback }))
@@ -331,15 +331,18 @@ export class Compiler {
 
     this.state.compileJSON = (source: SourceWithTarget, timeStamp: number) => {
       if (source && source.sources) {
-        const { optimize, runs, evmVersion, language, useFileConfiguration, configFileContent } = this.state
+        const { optimize, runs, evmVersion, language, remappings, useFileConfiguration, configFileContent } = this.state
         jobs.push({ sources: source })
         let input = ""
 
         try {
           if (useFileConfiguration) {
-            input = compilerInputForConfigFile(source.sources, JSON.parse(configFileContent))
+            const compilerInput = JSON.parse(configFileContent)
+            if (compilerInput.settings.remappings?.length) compilerInput.settings.remappings.push(...remappings)
+            else compilerInput.settings.remappings = remappings
+            input = compilerInputForConfigFile(source.sources, compilerInput)
           } else {
-            input = compilerInput(source.sources, { optimize, runs, evmVersion, language })
+            input = compilerInput(source.sources, { optimize, runs, evmVersion, language, remappings })
           }
         } catch (exception) {
           this.onCompilationFinished({ error: { formattedMessage: exception.message } }, [], source, "", this.state.currentVersion)

libs/remix-solidity/src/compiler/types.ts

@@ -147,7 +147,8 @@ export interface CompilerInputOptions {
         [fileName: string]: Record<string, string>
     },
     evmVersion?: EVMVersion,
-    language?: Language
+    language?: Language,
+    remappings?: string[]
 }
 
 export type EVMVersion = 'homestead' | 'tangerineWhistle' | 'spuriousDragon' | 'byzantium' | 'constantinople' | 'petersburg' | 'istanbul' | 'berlin' | 'london' | 'paris' | null
@@ -168,6 +169,7 @@ export interface CompilerState {
     runs: number
     evmVersion: EVMVersion| null,
     language: Language,
+    remappings: string[]
     compilationStartTime: number| null,
     target: string | null,
     useFileConfiguration: boolean,

libs/remix-ui/solidity-compiler/src/lib/compiler-container.tsx

@@ -59,6 +59,7 @@ export const CompilerContainer = (props: CompilerContainerProps) => {
     compiledFileName: '',
     includeNightlies: false,
     language: 'Solidity',
+    remappings: [],
     evmVersion: '',
     createFileOnce: true
   })

libs/remix-ui/solidity-compiler/src/lib/logic/compileTabLogic.ts

@@ -106,10 +106,15 @@ export class CompileTabLogic {
   compileFile (target) {
     if (!target) throw new Error('No target provided for compiliation')
     return new Promise((resolve, reject) => {
-      this.api.readFile(target).then((content) => {
+      this.api.readFile(target).then(async(content) => {
         const sources = { [target]: { content } }
         this.event.emit('removeAnnotations')
         this.event.emit('startingCompilation')
+        if(await this.api.fileExists('remappings.txt')) {
+          this.api.readFile('remappings.txt').then( remappings => {
+            this.compiler.set('remappings', remappings.split('\n'))
+          })
+        }
         if (this.configFilePath) {
           this.api.readFile(this.configFilePath).then( contentConfig => {
             this.compiler.set('configFileContent', contentConfig)