1 // this file implements the structures and lexer for the protocol buffer format 2 // required to parse a protocol buffer file or tree and generate 3 // code to read and write the specified format 4 module dprotobuf.pbenum; 5 import dprotobuf.pbgeneral; 6 7 version(D_Version2) { 8 import std.algorithm; 9 import std.range; 10 import std.regex; 11 } else 12 import dprotobuf.d1support; 13 14 import std.conv; 15 import std.stdio; 16 import std..string; 17 18 struct PBEnum { 19 string name; 20 string[] comments; 21 string[][int] valueComments; 22 string[int] values; 23 24 // string-modifying constructor 25 static PBEnum opCall(ref ParserData pbstring) 26 in { 27 assert(pbstring.length); 28 } body { 29 PBEnum pbenum; 30 // strip of "enum" and following whitespace 31 pbstring = pbstring["enum".length..pbstring.length]; 32 pbstring = stripLWhite(pbstring); 33 // grab name 34 pbenum.name = stripValidChars(CClass.Identifier,pbstring); 35 if (!pbenum.name.length) throw new PBParseException("Enum Definition","Could not pull name from definition.", pbstring.line); 36 if (!validIdentifier(pbenum.name)) throw new PBParseException("Enum Definition","Invalid name identifier "~pbenum.name~".", pbstring.line); 37 pbstring = stripLWhite(pbstring); 38 39 // rip out the comment... 40 if (pbstring.length>1 && pbstring.input[0..2] == "//") { 41 pbenum.comments ~= stripValidChars(CClass.Comment,pbstring); 42 pbstring = stripLWhite(pbstring); 43 } 44 45 // make sure the next character is the opening { 46 if (!pbstring.input.skipOver("{")) { 47 throw new PBParseException("Enum Definition("~pbenum.name~")","Expected next character to be '{'. You may have a space in your enum name: "~pbenum.name, pbstring.line); 48 } 49 50 CommentManager storeComment; 51 int elementNum; 52 53 pbstring = stripLWhite(pbstring); 54 // now we're ready to enter the loop and parse children 55 while(pbstring[0] != '}') { 56 if (pbstring.input.skipOver("option")) { 57 pbstring = stripLWhite(pbstring); 58 writefln("Ignoring option %s", 59 ripOption(pbstring).name); 60 pbstring.input.skipOver(";"); 61 } 62 else if (pbstring.length>1 && pbstring.input[0..2] == "//") { 63 // rip out the comment... 64 storeComment ~= stripValidChars(CClass.Comment,pbstring); 65 storeComment.line = pbstring.line; 66 } else { 67 // start parsing, we shouldn't have any whitespace here 68 elementNum = pbenum.grabEnumValue(pbstring); 69 storeComment.lastElementLine = pbstring.line; 70 if(!storeComment.comments.empty()) { 71 pbenum.valueComments[elementNum] = storeComment.comments; 72 storeComment.comments = null; 73 } 74 } 75 if(storeComment.line == storeComment.lastElementLine) { 76 pbenum.valueComments[elementNum] = storeComment.comments; 77 storeComment.comments = null; 78 } 79 pbstring = stripLWhite(pbstring); 80 } 81 // rip off the } 82 pbstring = pbstring[1..pbstring.length]; 83 return pbenum; 84 } 85 86 /** 87 * returns: 88 * enum entry value 89 */ 90 int grabEnumValue(ref ParserData pbstring) 91 in { 92 assert(pbstring.length); 93 } body { 94 // whitespace has already been ripped 95 // snag item name 96 string tmp = stripValidChars(CClass.Identifier,pbstring); 97 if (!tmp.length) throw new PBParseException("Enum Definition("~name~")","Could not pull item name from definition.", pbstring.line); 98 if (!validIdentifier(tmp)) throw new PBParseException("Enum Definition("~name~")","Invalid item name identifier "~tmp~".", pbstring.line); 99 pbstring = stripLWhite(pbstring); 100 // ensure that the name doesn't already exist 101 foreach(val;values.values) if (tmp == val) throw new PBParseException("Enum Definition("~name~")","Multiple defined element("~tmp~")", pbstring.line); 102 // make sure to traverse the '=' 103 if (!pbstring.input.skipOver("=")) throw new PBParseException("Enum Definition("~name~"."~tmp~")","Expected '=', but got something else. You may have a space in one of your enum items.", pbstring.line); 104 105 pbstring = stripLWhite(pbstring); 106 // now parse a numeric 107 string num = stripValidChars(CClass.Numeric,pbstring); 108 if (!num.length) throw new PBParseException("Enum Definition("~name~"."~tmp~")","Could not pull numeric enum value.", pbstring.line); 109 values[to!(int)(num)] = tmp; 110 pbstring = stripLWhite(pbstring); 111 // deal with inline options 112 if (pbstring[0] == '[') { 113 ripOptions(pbstring); 114 } 115 // make sure we snatch a semicolon 116 if (!pbstring.input.skipOver(";")) 117 throw new PBParseException("Enum Definition("~name~"."~tmp~"="~num~")","Expected ';'.", pbstring.line); 118 119 return to!(int)(num); 120 } 121 }