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Improve label validation for platform symbol files

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We were using a very simple regex pattern for the label part, and
not performing additional validation checks later.  This allowed
a symbol that started with a number (e.g. "4ALL") to get much farther
than it should have.

This change modifies the regex pattern to match only valid label
syntax.
This commit is contained in:
Andy McFadden 2021-07-03 12:32:02 -07:00
parent 210723221d
commit 1472609d15
1 changed files with 6 additions and 3 deletions
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9
SourceGen/PlatformSymbols.cs
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@ -44,7 +44,7 @@ namespace SourceGen {
/// NAME {@,=,<,>} VALUE [& MASK] [WIDTH] [;COMMENT]
///
/// Regex output groups are:
/// 1. NAME
/// 1. NAME (2+ alphanumeric or underscore, cannot start with number)
/// 2. type/direction char
/// 3. VALUE (can be any non-whitespace)
/// 4. optional: WIDTH (can be any non-whitespace)
@ -54,7 +54,7 @@ namespace SourceGen {
/// If you want to make sense of this, I highly recommend https://regex101.com/ .
/// </remarks>
private const string SYMBOL_PATTERN =
@"^([A-Za-z0-9_]+)\s*([@=<>])\s*([^\s;]+)\s*([^\s;]+)?\s*(;.*)?$";
@"^([A-Za-z_][A-Za-z0-9_]+)\s*([@=<>])\s*([^\s;]+)\s*([^\s;]+)?\s*(;.*)?$";
private static Regex sNameValueRegex = new Regex(SYMBOL_PATTERN);
private const int GROUP_NAME = 1;
private const int GROUP_TYPE = 2;
@ -63,7 +63,8 @@ namespace SourceGen {
private const int GROUP_COMMENT = 5;
/// <summary>
/// Regex pattern for mask definition in platform symbol file.
/// Regex pattern for mask definition in platform symbol file. This mostly just
/// performs tokenization. Syntax and validity checking is done later.
///
/// Looks like:
/// CMP_MASK CMP_VALUE ADDR_MASK [;COMMENT]
@ -158,6 +159,8 @@ namespace SourceGen {
} else {
MatchCollection matches = sNameValueRegex.Matches(line);
if (matches.Count == 1) {
// Our label regex is the same as Asm65.Label's definition; no need
// for further validation on the label.
string label = matches[0].Groups[GROUP_NAME].Value;
char typeAndDir = matches[0].Groups[GROUP_TYPE].Value[0];
bool isConst = (typeAndDir == '=');