From d5fe336068b46c06924e9d7f9dd2af50f95c27d9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Adrien=20Verg=C3=A9?= <adrienverge@gmail.com>
Date: Sun, 2 Oct 2022 20:03:30 +0200
Subject: [PATCH] float-values: Fix bug on strings containing fordidden values
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The rule correctly reports number values like `.1`, `1e2`, `.NaN` and
`.Inf`, but it also reported false positives on strings like `.1two3`,
`1e2a`, `.NaNa` and `.Infinit∞`.

The regexps need to end with an end delimiter (`$`) otherwise longer
strings can be matched too.

Fixes https://github.com/adrienverge/yamllint/issues/495
---
 tests/rules/test_float_values.py | 20 ++++++++++++++------
 yamllint/rules/float_values.py   |  8 ++++----
 2 files changed, 18 insertions(+), 10 deletions(-)

diff --git a/tests/rules/test_float_values.py b/tests/rules/test_float_values.py
index 64182f3a..8aa980cd 100644
--- a/tests/rules/test_float_values.py
+++ b/tests/rules/test_float_values.py
@@ -40,6 +40,8 @@ def test_numeral_before_decimal(self):
                    '- 0.0\n'
                    '- .1\n'
                    '- \'.1\'\n'
+                   '- string.1\n'
+                   '- .1string\n'
                    '- !custom_tag .2\n'
                    '- &angle1 0.0\n'
                    '- *angle1\n'
@@ -47,7 +49,7 @@ def test_numeral_before_decimal(self):
                    '- *angle2\n',
                    conf,
                    problem1=(3, 3),
-                   problem2=(8, 11))
+                   problem2=(10, 11))
 
     def test_scientific_notation(self):
         conf = (
@@ -61,6 +63,8 @@ def test_scientific_notation(self):
                    '- 10e-6\n'
                    '- 0.00001\n'
                    '- \'10e-6\'\n'
+                   '- string10e-6\n'
+                   '- 10e-6string\n'
                    '- !custom_tag 10e-6\n'
                    '- &angle1 0.000001\n'
                    '- *angle1\n'
@@ -71,8 +75,8 @@ def test_scientific_notation(self):
                    conf,
                    problem1=(2, 3),
                    problem2=(3, 3),
-                   problem3=(9, 11),
-                   problem4=(11, 11))
+                   problem3=(11, 11),
+                   problem4=(13, 11))
 
     def test_nan(self):
         conf = (
@@ -85,13 +89,15 @@ def test_nan(self):
                    '- .NaN\n'
                    '- .NAN\n'
                    '- \'.NaN\'\n'
+                   '- a.NaN\n'
+                   '- .NaNa\n'
                    '- !custom_tag .NaN\n'
                    '- &angle .nan\n'
                    '- *angle\n',
                    conf,
                    problem1=(2, 3),
                    problem2=(3, 3),
-                   problem3=(6, 10))
+                   problem3=(8, 10))
 
     def test_inf(self):
         conf = (
@@ -106,6 +112,8 @@ def test_inf(self):
                    '- -.inf\n'
                    '- -.INF\n'
                    '- \'.inf\'\n'
+                   '- ∞.infinity\n'
+                   '- .infinity∞\n'
                    '- !custom_tag .inf\n'
                    '- &angle .inf\n'
                    '- *angle\n'
@@ -116,5 +124,5 @@ def test_inf(self):
                    problem2=(3, 3),
                    problem3=(4, 3),
                    problem4=(5, 3),
-                   problem5=(8, 10),
-                   problem6=(10, 10))
+                   problem5=(10, 10),
+                   problem6=(12, 10))
diff --git a/yamllint/rules/float_values.py b/yamllint/rules/float_values.py
index d8c46908..a5852c56 100644
--- a/yamllint/rules/float_values.py
+++ b/yamllint/rules/float_values.py
@@ -107,13 +107,13 @@
 }
 
 IS_NUMERAL_BEFORE_DECIMAL_PATTERN = (
-    re.compile('[-+]?(\\.[0-9]+)([eE][-+]?[0-9]+)?')
+    re.compile('[-+]?(\\.[0-9]+)([eE][-+]?[0-9]+)?$')
 )
 IS_SCIENTIFIC_NOTATION_PATTERN = re.compile(
-    '[-+]?(\\.[0-9]+|[0-9]+(\\.[0-9]*)?)([eE][-+]?[0-9]+)'
+    '[-+]?(\\.[0-9]+|[0-9]+(\\.[0-9]*)?)([eE][-+]?[0-9]+)$'
 )
-IS_INF_PATTERN = re.compile('[-+]?(\\.inf|\\.Inf|\\.INF)')
-IS_NAN_PATTERN = re.compile('\\.nan|\\.NaN|\\.NAN')
+IS_INF_PATTERN = re.compile('[-+]?(\\.inf|\\.Inf|\\.INF)$')
+IS_NAN_PATTERN = re.compile('(\\.nan|\\.NaN|\\.NAN)$')
 
 
 def check(conf, token, prev, next, nextnext, context):