504659c38b
We need to access the bound property values for a given stack, especially during code-generation. This information was present for services before, however not for stacks constructed via other means (e.g., the top-most one). This change adds a PropertyValues bag plus a corresponding BoundPropertyValues to the ast.Stack type.
122 lines
4.9 KiB
Go
122 lines
4.9 KiB
Go
// Copyright 2016 Marapongo, Inc. All rights reserved.
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package compiler
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import (
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"github.com/golang/glog"
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"github.com/marapongo/mu/pkg/ast"
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"github.com/marapongo/mu/pkg/compiler/core"
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"github.com/marapongo/mu/pkg/diag"
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"github.com/marapongo/mu/pkg/encoding"
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"github.com/marapongo/mu/pkg/errors"
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"github.com/marapongo/mu/pkg/util"
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)
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// Parse transforms a program's input text into a parse tree.
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type Parser interface {
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core.Phase
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// ParseStack parses a Mufile from the given document. If an error occurs, the return value will be nil. It is
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// expected that errors are conveyed using the diag.Sink interface.
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ParseStack(doc *diag.Document, props ast.PropertyBag) *ast.Stack
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// ParseWorkspace parses workspace settings from the given document. If an error occurs, the return value will be
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// nil. It is expected that errors are conveyed using the diag.Sink interface.
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ParseWorkspace(doc *diag.Document) *ast.Workspace
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}
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func NewParser(c Compiler) Parser {
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return &parser{c}
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}
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type parser struct {
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c Compiler
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}
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func (p *parser) Diag() diag.Sink {
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return p.c.Diag()
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}
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func (p *parser) ParseWorkspace(doc *diag.Document) *ast.Workspace {
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glog.Infof("Parsing workspace settings: %v (len(body)=%v)", doc.File, len(doc.Body))
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if glog.V(2) {
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defer glog.V(2).Infof("Parsing workspace settings '%v' completed w/ %v warnings and %v errors",
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doc.File, p.Diag().Warnings(), p.Diag().Errors())
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}
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// We support many file formats. Detect the file extension and deserialize the contents.
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var w ast.Workspace
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marshaler, has := encoding.Marshalers[doc.Ext()]
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util.AssertMF(has, "No marshaler registered for this workspace extension: %v", doc.Ext())
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if err := marshaler.Unmarshal(doc.Body, &w); err != nil {
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p.Diag().Errorf(errors.ErrorIllegalWorkspaceSyntax.At(doc), err)
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// TODO[marapongo/mu#14]: issue an error per issue found in the file with line/col numbers.
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return nil
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}
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glog.V(3).Infof("Workspace settings %v parsed: %v clusters; %v deps",
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doc.File, len(w.Clusters), len(w.Dependencies))
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// Remember that this workspace came from this document.
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w.Doc = doc
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// Now create a parse tree analyzer to walk the parse trees and ensure that all is well.
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ptAnalyzer := NewPTAnalyzer(p.c)
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ptAnalyzer.AnalyzeWorkspace(&w)
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return &w
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}
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func (p *parser) ParseStack(doc *diag.Document, props ast.PropertyBag) *ast.Stack {
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glog.Infof("Parsing Mufile: %v (len(body)=%v len(props)=%v)", doc.File, len(doc.Body), len(props))
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if glog.V(7) {
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for pk, pv := range props {
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glog.V(7).Infof("Mufile %v property '%v'='%v'", doc.File, pk, pv)
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}
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}
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if glog.V(2) {
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defer glog.V(2).Infof("Parsing Mufile '%v' completed w/ %v warnings and %v errors",
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doc.File, p.Diag().Warnings(), p.Diag().Errors())
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}
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// Expand templates in the document first and foremost.
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// TODO[marapongo/mu#7]: the order of template expansion is not clear. The way we've done it right now (i.e.,
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// performing it right here), we haven't yet type-checked the properties supplied to the stack. As a result,
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// there is less compile-time safety. And furthermore, the properties are in a map rather than being stored
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// in structured types. In other words, this is really just a fancy pre-processor, rather than being well-
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// integrated into the type system. To do that, however, we'd need to delay processing of templates, which
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// itself will mess with our ability to parse the document. This is an area of future thinking.
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// TODO[marapongo/mu#7]: related to this, certain information (like cluster target) isn't even available yet!
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// TODO[marapongo/mu#14]: when we produce precise line/column errors, we'll need to somehow trace back to pre-
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// template expansion, otherwise the numbers may not make sense to the user.
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rend, err := RenderTemplates(doc, p.c.Context().WithProps(props))
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if err != nil {
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p.Diag().Errorf(errors.ErrorBadTemplate.At(doc), err)
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return nil
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}
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doc = rend
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// We support many file formats. Detect the file extension and deserialize the contents.
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var stack ast.Stack
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marshaler, has := encoding.Marshalers[doc.Ext()]
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util.AssertMF(has, "No marshaler registered for this Mufile extension: %v", doc.Ext())
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if err := marshaler.Unmarshal(doc.Body, &stack); err != nil {
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p.Diag().Errorf(errors.ErrorIllegalMufileSyntax.At(doc), err)
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// TODO[marapongo/mu#14]: issue an error per issue found in the file with line/col numbers.
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return nil
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}
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glog.V(3).Infof("Mufile %v stack parsed: %v name; %v publics; %v privates",
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doc.File, stack.Name, len(stack.Services.PublicUntyped), len(stack.Services.PrivateUntyped))
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// Remember that this stack came from this document (both template expanded and unexpanded forms).
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stack.Doc = doc
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// Remember the properties used to construct this stack.
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stack.PropertyValues = props
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// Now create a parse tree analyzer to walk the parse trees and ensure that all is well.
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ptAnalyzer := NewPTAnalyzer(p.c)
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ptAnalyzer.AnalyzeStack(&stack)
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return &stack
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}
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