Repository: protofire/solhint (js)

Issue:
compiler-version should reject files without versions
If `compiler-version` is enabled, then a file like

```solidity
contract Foo {}
```

shouldn't pass that rule because there's no pragma with the solidity version.

Pull request description:
compiler-version should reject files without versions
Closes #130 

Please see the base branch, is the `3.0`. 

#### Includes
- Added a validation in the `SourceUnit` function of the `CompilerVersionChecker` rule
- Check for the existence of the directive in the childrens
- Added a couple of tests



Patch:
diff --git a/lib/rules/security/compiler-version.js b/lib/rules/security/compiler-version.js
index 3882d9b..4db223f 100644
--- a/lib/rules/security/compiler-version.js
+++ b/lib/rules/security/compiler-version.js
@@ -44,6 +44,14 @@ class CompilerVersionChecker extends BaseChecker {
     this.requirement = (config && config.getString(ruleId, DEFAULT_SEMVER)) || DEFAULT_SEMVER
   }
 
+  SourceUnit(node) {
+    const hasPragmaDirectiveDef = node.children.some(curItem => curItem.type === 'PragmaDirective')
+
+    if (!hasPragmaDirectiveDef) {
+      this.warn(node, 'Compiler version must be declared ')
+    }
+  }
+
   PragmaDirective(node) {
     if (!semver.satisfies(semver.minVersion(node.value), this.requirement)) {
       this.warn(


Test patch:
diff --git a/test/rules/security/compiler-version.js b/test/rules/security/compiler-version.js
index 9d7da6b..e69b115 100644
--- a/test/rules/security/compiler-version.js
+++ b/test/rules/security/compiler-version.js
@@ -167,4 +167,24 @@ describe('Linter - compiler-version', () => {
 
     assert.equal(report.errorCount, 1)
   })
+
+  it(`should report compiler version error if pragma doesn't exist`, () => {
+    const report = linter.processStr('contract Foo {}', {
+      rules: { 'compiler-version': ['error', '^0.5.2'] }
+    })
+
+    assert.equal(report.errorCount, 1)
+  })
+
+  it(`should not report compiler version error if pragma exist`, () => {
+    const report = linter.processStr(
+      `pragma solidity 0.6.0;
+      contract Foo {}`,
+      {
+        rules: { 'compiler-version': ['error', '^0.6.0'] }
+      }
+    )
+
+    assert.equal(report.errorCount, 0)
+  })
 })