[elpa] externals/parser-generator 4534b1f192 1/3: Lexer get token function now accepts nil as the semantical value for a token

[Christian Johansson]

branch: externals/parser-generator
commit 4534b1f19244a565894b6a5d4cd71185bb278fcd
Author: Christian Johansson <christ...@cvj.se>
Commit: Christian Johansson <christ...@cvj.se>
    Lexer get token function now accepts nil as the semantical value for a token
---
 docs/Lexical-Analysis.md         | 4 ++++
 parser-generator-lex-analyzer.el | 8 +-------
 parser-generator-lr-export.el    | 2 --
 3 files changed, 5 insertions(+), 9 deletions(-)

diff --git a/docs/Lexical-Analysis.md b/docs/Lexical-Analysis.md
index aae2dacbd0..e853191c6a 100644
--- a/docs/Lexical-Analysis.md
+++ b/docs/Lexical-Analysis.md
@@ -122,4 +122,8 @@ Returns the next token in stream and moves the lexical 
analyzer index one point
   (parser-generator-lex-analyzer--pop-token)))
 ```
 
+## Get Token
+
+Specified in the variable `parser-generator-lex-analyzer--get-function` as a 
function. Returns the semantical value for the token. For instance the token 
might be a `('T_STRING 1 . 5)` but it's semantical value might be `"Emacs"`, 
another example `('T_INTEGER 1 . 2)` might be `25`, another example 
`('T_BOOLEAN 1 . 4)` might be `nil` or `t`.
+
 [Back to start](../../../)
diff --git a/parser-generator-lex-analyzer.el b/parser-generator-lex-analyzer.el
index 2a38929f86..920100beb0 100644
--- a/parser-generator-lex-analyzer.el
+++ b/parser-generator-lex-analyzer.el
@@ -18,7 +18,7 @@
 (defvar
   parser-generator-lex-analyzer--get-function
   nil
-  "Get token contents.  Anything other than nil is expected.")
+  "Get token contents.  Any return is valid even nil.")
 
 (defvar
   parser-generator-lex-analyzer--function
@@ -89,12 +89,6 @@
           (car (cdr error)))
          token
          (car (cdr error))))))
-    (unless meta-information
-      (signal
-       'error
-       (list
-        (format "Could not find any token meta-information for: %s" token)
-        token)))
     meta-information))
 
 (defun parser-generator-lex-analyzer--peek-next-look-ahead ()
diff --git a/parser-generator-lr-export.el b/parser-generator-lr-export.el
index b522693468..d5e3e25dec 100644
--- a/parser-generator-lr-export.el
+++ b/parser-generator-lr-export.el
@@ -239,8 +239,6 @@
         \"Lex-analyze failed to get token meta-data of %s, error: %s\"
         token
         (car (cdr error)))))
-    (unless meta-information
-      (error \"Could not find any token meta-information for: %s\" token))
     meta-information))\n")
 
       ;; Lex-Analyzer Reset Function