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annotate src/dil/ModuleManager.d @ 813:1abffc396594

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Revised the ModuleManager class. Fixed Parser.parseModuleDeclaration().
author Aziz K?ksal <aziz.koeksal@gmail.com>
date Wed, 12 Mar 2008 00:49:17 +0100
parents 3b567bce56f3
children 615c1386b18d
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1 /++
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2 Author: Aziz Köksal
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3 License: GPL3
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4 +/
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5 module dil.ModuleManager;
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6
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7 import dil.semantic.Module;
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8 import dil.Location;
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9 import dil.Information;
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10 import dil.Messages;
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11 import common;
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12
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13 import tango.io.FilePath;
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14 import tango.io.FileSystem;
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15 import tango.io.FileConst;
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16
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17 alias FileConst.PathSeparatorChar dirSep;
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18
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19 /// Manages loaded modules in a table.
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20 class ModuleManager
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21 {
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22 /// Maps FQN paths to modules. E.g.: dil/ast/Node
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23 Module[string] moduleFQNPathTable;
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24 /// Maps absolute file paths to modules. E.g.: /home/user/dil/src/main.d
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25 Module[string] absFilePathTable;
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26 Module[] loadedModules; /// Loaded modules in sequential order.
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27 string[] importPaths; /// Where to look for module files.
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28 InfoManager infoMan;
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29
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30 /// Constructs a ModuleManager object.
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31 this(string[] importPaths, InfoManager infoMan)
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32 {
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33 this.importPaths = importPaths;
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34 this.infoMan = infoMan;
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35 }
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36
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37 /// Loads a module given a file path.
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38 Module loadModuleFile(string moduleFilePath)
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39 {
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40 auto absFilePath = FileSystem.toAbsolute(moduleFilePath);
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41 if (auto existingModule = absFilePath in absFilePathTable)
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42 return *existingModule;
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43
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44 // Create a new module.
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45 auto newModule = new Module(moduleFilePath, infoMan);
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46 newModule.parse();
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47
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48 auto moduleFQNPath = newModule.getFQNPath();
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49 if (auto existingModule = moduleFQNPath in moduleFQNPathTable)
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50 { // Error: two module files have the same f.q. module name.
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51 auto location = newModule.moduleDecl.begin.getErrorLocation();
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52 auto msg = Format(MSG.ConflictingModuleFiles, newModule.filePath());
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53 infoMan ~= new SemanticError(location, msg);
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54 return *existingModule;
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55 }
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56 // Insert new module.
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57 moduleFQNPathTable[moduleFQNPath] = newModule;
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58 absFilePathTable[absFilePath] = newModule;
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59 loadedModules ~= newModule;
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60 return newModule;
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61 }
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62
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63 /// Loads a module given an FQN path.
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64 Module loadModule(string moduleFQNPath)
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65 {
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66 // Look up in table if the module is already loaded.
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67 Module* pmodul = moduleFQNPath in moduleFQNPathTable;
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68 if (pmodul)
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69 return *pmodul;
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70 // Locate the module in the file system.
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71 auto moduleFilePath = findModuleFilePath(moduleFQNPath, importPaths);
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72 if (moduleFilePath.length)
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73 { // Load the found module file.
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74 auto modul = loadModuleFile(moduleFilePath);
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75 if (modul.getFQNPath() != moduleFQNPath)
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76 { // Error: the requested module is not in the correct package.
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77 auto location = modul.moduleDecl.begin.getErrorLocation();
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78 auto msg = Format(MSG.ModuleNotInPackage, getPackage(moduleFQNPath));
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79 infoMan ~= new SemanticError(location, msg);
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80 }
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81 return modul;
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82 }
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83 return null;
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84 }
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85
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86 /// Returns e.g. 'dil.ast' for 'dil/ast/Node'.
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87 string getPackage(string moduleFQNPath)
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88 {
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89 string pckg = moduleFQNPath.dup;
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90 uint lastDirSep;
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91 foreach (i, c; pckg)
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92 if (c == dirSep)
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93 (pckg[i] = '.'), (lastDirSep = i);
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94 return pckg[0..lastDirSep];
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95 }
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96
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97 /// Searches for a module in the file system looking in importPaths.
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98 /// Returns: the file path to the module, or null if it wasn't found.
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99 static string findModuleFilePath(string moduleFQNPath, string[] importPaths)
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100 {
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101 auto filePath = new FilePath();
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102 foreach (importPath; importPaths)
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103 {
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104 filePath.set(importPath); // E.g.: src/
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105 filePath.append(moduleFQNPath); // E.g.: dil/ast/Node
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106 foreach (moduleSuffix; [".d", ".di"/*interface file*/])
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107 {
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108 filePath.suffix(moduleSuffix);
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109 if (filePath.exists()) // E.g.: src/dil/ast/Node.d
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110 return filePath.toString();
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111 }
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112 }
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113 return null;
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114 }
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115 }