chore: add section + tests for literals in PARI/GP

src/literals.YAML-tmLanguage

@@ -0,0 +1,21 @@
+---
+repository:
+    literals:
+        patterns:
+            - include: "#numeric"
+
+        repository:
+            numeric:
+                patterns:
+                    -
+                        match: '\b(0(x|X)[0-9A-Fa-f]*)\b'
+                        name: constant.numeric.hex
+                    -
+                        match: '\b(0(b|B)[0-1]*)\b'
+                        name: constant.numeric.bin
+                    -
+                        match: '\b([0-9]*\.[0-9]*\s*[eE][+-]?[0-9]+)\b'
+                        name: constant.numeric.float
+                    -
+                        match: '\b([0-9]+)\b'
+                        name: constant.numeric.int

src/main.YAML-tmLanguage

@@ -12,6 +12,7 @@ repository:
         patterns:
             - include: "#comments"
             - include: "#functions"
+            - include: "#literals"
 scopeName: source.parigp
 $schema: >-
   https://raw.githubusercontent.com/martinring/tmlanguage/master/tmlanguage.json

tests/Literals.test.gp

@@ -0,0 +1,17 @@
+## SYNTAX TEST "source.parigp" "Literals"
+
+  1.23E-10
+##^^^^^^^^ source.parigp constant.numeric.float
+
+  -123 + 043664.32
+## ^^^ source.parigp constant.numeric.int
+##.      ^^^^^^^^^ source.parigp constant.numeric.float
+
+  00432
+##^^^^^ source.parigp constant.numeric.int
+
+  0x12A3F
+##^^^^^^^ source.parigp constant.numeric.hex
+
+  0b00011001
+##^^^^^^^^^^ source.parigp constant.numeric.bin