From d4244f3d52f276337b44b0bab8c85094c985682f Mon Sep 17 00:00:00 2001
From: Vegard Storheil Eriksen <zyp@jvnv.net>
Date: Thu, 7 Jan 2021 02:12:00 +0100
Subject: build: Add platform spec framework.

---
 build/scons_tools/tool_platform_spec.py | 112 ++++++++++++++++++++++++++++++++
 1 file changed, 112 insertions(+)
 create mode 100644 build/scons_tools/tool_platform_spec.py

(limited to 'build/scons_tools/tool_platform_spec.py')

diff --git a/build/scons_tools/tool_platform_spec.py b/build/scons_tools/tool_platform_spec.py
new file mode 100644
index 0000000..a532036
--- /dev/null
+++ b/build/scons_tools/tool_platform_spec.py
@@ -0,0 +1,112 @@
+from SCons.Script import *
+
+import yaml
+import re
+import os.path
+
+def load(fn):
+    return yaml.load(open(fn), Loader = yaml.FullLoader)
+
+class Matcher:
+    pass
+
+class ReMatcher(Matcher):
+    def __init__(self, pattern):
+        self.pattern = pattern
+    
+    def match(self, meta, key):
+        m = re.match(self.pattern, meta.get(key, ''))
+
+        if m:
+            meta.update(m.groupdict())
+            return True
+
+        return False
+
+class Import:
+    def __init__(self, fn):
+        self.fn = fn
+        self.data = None
+    
+    def _load(self):
+        if self.data is None:
+            self.data = load(self.fn)
+    
+    def __iter__(self):
+        self._load()
+        return iter(self.data or [])
+
+yaml.add_constructor('!re', (lambda loader, node: ReMatcher(loader.construct_scalar(node))))
+
+def construct_import(loader, node):
+    fn = loader.construct_scalar(node)
+    path = os.path.split(loader.stream.name)[0]
+
+    return Import(os.path.join(path, fn))
+
+yaml.add_constructor('!import', construct_import)
+
+def unprefix(s):
+    return int(s[:-1]) * 1024**(' kMG'.index(s[-1]))
+
+yaml.add_constructor('!prefixed', (lambda loader, node: unprefix(loader.construct_scalar(node))))
+yaml.add_implicit_resolver('!prefixed', re.compile(r'^\d+[kMG]$'))
+
+def match(meta, name, value):
+    if isinstance(value, Matcher):
+        return value.match(meta, name)
+
+    return meta.get(name) == value
+
+def merge(parent, key, value):
+    if key in parent:
+        target = parent[key]
+        if isinstance(target, dict):
+            for k, v in value.items():
+                merge(target, k, v)
+            return
+        
+        elif isinstance(target, list):
+            target.extend(value)
+            return
+
+    parent[key] = value
+
+def parse(state, data):
+    for obj in data:
+        if not obj:
+            continue
+
+        m = obj.get('match')
+        if m:
+            if not all(match(state['meta'], name, value) for name, value in m.items()):
+                continue
+        
+        for key, value in obj.items():
+            if key in ('match', '-'):
+                continue
+
+            #state[key] = obj[key]
+            merge(state, key, obj[key])
+        
+        if '-' in obj:
+            parse(state, obj['-'])
+    
+    return state
+
+def PlatformSpec(env, **kwargs):
+    state = {
+        'meta': kwargs
+    }
+
+    fn = str(env.File('${LAKS_PATH}/platforms/index.yaml'))
+
+    data = yaml.load(open(fn), Loader = yaml.FullLoader)
+
+    return parse(state, data)
+
+def exists():
+    return True
+
+def generate(env):
+    env.AddMethod(PlatformSpec)
\ No newline at end of file
-- 
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